| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D000219.1 | SGP/SONDE/C1 - Incorrect surface temperature | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D000308.1 | SGP/SONDE - Questionable absolute pressures | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D000308.2 | SGP/SONDE - Questionable absolute pressures | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D000606.1 | SGP/MWR/C1 - IRT removed | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D000625.1 | SGP/SONDE/C1 - Operator used wrong calibration tape | sgpsondeC1.00, sgpsondeC1.a0, sgpsondeC1.a1, sgpsondewndcalcC1.c1, sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D000801.2 | SGP/SONDE/C1 - Incorrect absolute pressure | sgpsondewndcalcC1.c1, sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D001107.1 | SGP/SONDE/C1 - Incorrect surface temperature | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D001122.1 | SGP/MWR/C1 - calibration checks | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D001205.1 | SGP/MWR/C1 - Time drift | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D010215.5 | SGP/MWR/C1 - IRT failure | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D020905.3 | SGP/MWR/C1 - IRT not insulated | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D030214.1 | SGP/MWR/B4/C1 - LOS cycle skipping | sgpmwrlosB4.a1, sgpmwrlosB4.b1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D030312.10 | SGP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D030822.1 | SGP/MWR/C1 - Incorrect min and max values | sgpmwrlosC1.b1 |
| D030902.1 | SGP/MWR/C1 - no air temperature signal | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D040824.1 | SGP/MWR/C1 - Wet window flag "on" more frequently than expected | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D041001.3 | SGP/MWR/C1 - Instrument problem | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D041014.1 | SGP/MWR/C1 - thermal instability | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D041117.2 | SGP/MWR/C1 - Reprocess: wrong retrievals | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1, sgpqmemwrcolC1.c1 |
| D050203.3 | SGP/MWR/C1 - spare instrument | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D050722.1 | SGP/MWR/C1 - REPROCESS - Revised Retrieval Coefficients | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1, sgpqmemwrcolC1.c1 |
| D050915.1 | SGP/MWR/C1 - Instrument noise problem | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D050919.6 | SGP/MWR/C1 - Instrument offline | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D051011.6 | SGP/MWR/C1 - New software version (4.15) installed | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D051123.1 | SGP/MWR/C1 - computer problem | sgpmwrC1.00, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D051207.3 | SGP/MWR/C1 - Power supply failure | sgpmwrC1.00, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D060717.2 | SGP/MWR/C1 - Spikes in ambient temperature readings | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D060821.3 | SGP/MWR/C1 - Missing data | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D061213.4 | SGP/MWR/C1 - Instrument testing | sgpmwrC1.00, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D070314.2 | SGP/MWR/C1/E14 - Freezing rain-Incorrect rain flag | sgpmwrlosC1.b1, sgpmwrlosE14.b1, sgpmwrtipC1.a1, sgpmwrtipE14.a1 |
| D070802.3 | SGP/MWR/C1 - Noisy data | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D071128.2 | SGP/MWR/C1 - Reprocess: Radiometer reinstalled- Please reprocess | sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D080103.2 | SGP/MWR/C1 - Missing data | sgpmwrlosC1.b1 |
| D080625.1 | SGP/MWR/C1 - Missing data | sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D940804.1 | Possible error in humidity ground check | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D940820.1 | SGP/MWR/C1 - IRT rain lid removal | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D941104.1 | Bad surface RH value in sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D941108.2 | Bad surface RH value in sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D941108.4 | CF Sonde Ground Check Corrections | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D941213.1 | Questionable initial values sounding 941209:1133 | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D950109.1 | Questionable surface value 1/2/95 11:32 | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D950109.2 | Questionable surface value 1/3/95 11:29 | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D950110.2 | SGP/MWR/C1 - Data dropouts due to serial comm problems | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D950304.1 | Reprocess: Sounding 950222:0530 done in research mode | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D950310.1 | Bad surface values in sounding 3/9/95:0530 | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D950316.1 | Reprocess: Sounding 950315:1429 done in research mode | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D950417.1 | Reprocess: Sounding 950413:1130 done in research mode | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D950419.1 | Bad surface values in sounding 4/17/95 14:29 | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D950501.2 | SGP/MWR/C1 - IR thermometer calibration check | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D950816.5 | bad surface tdry value in sounding 17:55 | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D951006.1 | Apparent Interference Signal in Sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D951006.2 | Apparent Interference Signal in Sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D951006.3 | Apparent Interference Signal in Sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D951006.4 | Apparent Interference Signal in Sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D951006.5 | Apparent Interference Signal in Sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D951006.6 | Apparent Interference Signal in Sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960122.1 | Jump in pressure value upon launch | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960122.2 | Jump in pressure value upon launch | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960129.1 | Bad surface pressure sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960202.2 | bad pressure sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960223.1 | Incorrect surface pressure sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960223.2 | Incorrect surface pressure sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960229.2 | SGP/SONDE/C1 - incorrect factory RH calib-radiosondes | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960403.1 | Bad surface pressure sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960405.1 | SGP/MWR/C1 - Loss of thermal stabilization | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D960415.1 | Bad surface pressure sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960422.1 | SGP/MWR/C1 - Radio Frequency Interference during IOP | sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D960506.1 | Bad surface pressure sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960602.2 | bad surface pressure sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960611.3 | bad surface values sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960701.4 | Bad surface pressure sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960706.1 | Bad surface pressure sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960913.1 | bad surface pressure sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960913.2 | bad surface pressure sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960913.3 | bad surface pressure sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960913.5 | bad surface pressure sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D960927.2 | Bad surface pressure sounding | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D961114.1 | SGP/MWR/C1 - IRT lens replaced | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D961120.1 | SGP/MWR/B1/B4/B5/B6/C1 - Thermal Stabilization Adjustment | sgp1mwravgC1.c1, sgp5mwravgB1.c1, sgp5mwravgB4.c1, sgp5mwravgB5.c1, sgp5mwravgB6.c1, sgp5mwravgC1.c1, sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1, sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D961220.1 | SGP/MWR/C1 - IRT Calibration check | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D970111.1 | Incorrect surface temperature | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D970318.2 | Questionable RH | sgpsondewrpnC1.a1 |
| D970507.2 | Jump in pressure value | sgpsondewrpnC1.a1 |
| D970509.1 | SGP/MWR/C1 - IRT Calibration | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D970624.2 | Incorrect surface values | sgpsondewrpnC1.a1 |
| D970625.1 | Bad sounding file CF 970622:0228 | sgpsondewrpnC1.a1 |
| D970709.1 | Bad pressure values CF sounding 970704:0525 | sgpsondewrpnC1.a1 |
| D970710.1 | Questionable pressure/altitude data | sgpsondewrpnC1.a1 |
| D970923.2 | Pressure jump at launch | sgpsondewrpnC1.a1 |
| D980126.1 | Incorrect radiosonde serial numbers | sgpsondewrpnB1.a0, sgpsondewrpnB1.a1, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1, sgpsondewrpnB5.a0, sgpsondewrpnB5.a1, sgpsondewrpnB6.a0, sgpsondewrpnB6.a1, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D980126.2 | Incorrect surface temperature and humidity | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D980130.1 | SGP/MWR/C1 - IRT offline | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D980506.1 | Incorrect surface values | sgpsondewrpnC1.a1 |
| D980507.1 | SGP/MWR/C1 - IRT lens replaced | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| D980507.4 | Incorrect surface pressure | sgpsondewrpnC1.a1 |
| D980511.2 | Incorrect surface pressure | sgpsondewrpnC1.a1 |
| D980716.1 | Bad sounding | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D980917.1 | Incorrect surface readings | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D980917.2 | Incorrect surface RH | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D981204.1 | SGP/MWR/C1 - Erroneous internal temperature | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| D990106.1 | SGP/MWR/B1/B4/B6/C1 - software change | sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1, sgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB6.a0 |
| D990113.1 | SGP/MWR/B1/B4/B5/B6/C1 - software upgrade (version 3.27) | sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB5.a0, sgpmwrtipB6.a0 |
| D990124.2 | SGP/SONDE - Dry bias in sonde RH | DsgpsondeB1.00, DsgpsondeB1.a0, DsgpsondeB1.a1, DsgpsondeB4.00, DsgpsondeB4.a0, DsgpsondeB4.a1, DsgpsondeB5.00, DsgpsondeB5.a0, DsgpsondeB5.a1, DsgpsondeC1.00, DsgpsondeC1.a0, DsgpsondeC1.a1, DsgpsondenogcptucalcB1.c1, DsgpsondenogcptucalcB4.c1, DsgpsondenogcptucalcB5.c1, DsgpsondenogcptucalcC1.c1, DsgpsondenogcwrpnB1.c1, DsgpsondenogcwrpnB4.c1, DsgpsondenogcwrpnB5.c1, DsgpsondenogcwrpnC1.c1, DsgpsondeptuB1.00, DsgpsondeptuB4.00, DsgpsondeptuB5.00, DsgpsondeptuB6.00, DsgpsondeptuC1.00, DsgpsondeptucalcB1.c1, DsgpsondeptucalcB4.c1, DsgpsondeptucalcB5.c1, DsgpsondeptucalcC1.c1, sgpsondeB1.00, sgpsondeB1.a0, sgpsondeB1.a1, sgpsondeB4.00, sgpsondeB4.a0, sgpsondeB4.a1, sgpsondeB5.00, sgpsondeB5.a0, sgpsondeB5.a1, sgpsondeB6.00, sgpsondeC1.00, sgpsondeC1.a0, sgpsondeC1.a1, sgpsondeptuC1.00, sgpsondewnpnB1.a0, sgpsondewnpnB1.a1, sgpsondewnpnB4.a0, sgpsondewnpnB4.a1, sgpsondewnpnB5.a0, sgpsondewnpnB5.a1, sgpsondewnpnB6.a0, sgpsondewnpnB6.a1, sgpsondewnpnC1.a0, sgpsondewnpnC1.a1, sgpsondewnprC1.a0, sgpsondewnprC1.a1, sgpsondewrpnB1.00, sgpsondewrpnB1.a0, sgpsondewrpnB1.a1, sgpsondewrpnB4.00, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1, sgpsondewrpnB5.00, sgpsondewrpnB5.a0, sgpsondewrpnB5.a1, sgpsondewrpnB6.00, sgpsondewrpnB6.a0, sgpsondewrpnB6.a1, sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1, sgpsondewrprB1.00, sgpsondewrprB1.a0, sgpsondewrprB1.a1, sgpsondewrprB4.00, sgpsondewrprB4.a0, sgpsondewrprB4.a1, sgpsondewrprB5.00, sgpsondewrprB5.a0, sgpsondewrprB5.a1, sgpsondewrprC1.00, sgpsondewrprC1.a0, sgpsondewrprC1.a1 |
| D990210.1 | SGP/SONDE - Wrong cal tape | sgpsondewndcalcC1.c1, sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D990303.1 | SGP/SONDE - Pressure jump at launch | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D990329.1 | Incorrect surface RH | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D990513.1 | SGP/SONDE - RH probably biased low in several soundings | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D991221.1 | SGP/SONDE - Incorrect surface temperature | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| D991228.1 | SGP/SONDE - Incorrect surface temperature | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/17/2000 | 2330 | 02/17/2000 | 2330 |
| Subject: | SGP/SONDE/C1 - Incorrect surface temperature |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | It appears as if the operator mis-typed the temperature when entering the surface values into the system. The value appears as 89.0 degC instead of 8.9 degC. Also note that there are no RH data in this sounding other than the initial value of 100%. The reason for this loss of RH is unknown. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/03/2000 | 2328 | 03/04/2000 | 0051 |
| Subject: | SGP/SONDE - Questionable absolute pressures |
| DataStreams: | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | The sonde surface pressure reading was considerably higher than the corresponding THWAPS pressure (988.0 hPa vs 982.3 hPa). The sonde readings are consistent during the sounding, however, suggesting that this is not a case of a pressure jump at launch but one of sensor offset. This problem will only affect those who use the absolute pressure values. The file altitudes, which are based on the relative pressure changes from the surface, should be fine. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.00:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/04/2000 | 0229 | 03/04/2000 | 0359 |
| Subject: | SGP/SONDE - Questionable absolute pressures |
| DataStreams: | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | The sonde surface pressure reading was considerably higher than the corresponding THWAPS pressure (992.9 hPa vs 983.0 hPa). The sonde readings are consistent during the sounding, however, suggesting that this is not a case of a pressure jump at launch but one of sensor offset. This problem will only affect those who use the absolute pressure values. The file altitudes, which are based on the relative pressure changes from the surface, should be fine. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.00:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/19/1999 | 2230 | 11/17/1999 | 2025 |
| Subject: | SGP/MWR/C1 - IRT removed |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | There were no IRT data during this period because MWR #10, upon which the IRT is mounted, was returned to the vendor for upgrades and replaced with spare MWR #33 which does not have the mounting hardware or the electronics to accept the IRT. |
| Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/23/2000 | 2330 | 06/24/2000 | 0100 |
| Subject: | SGP/SONDE/C1 - Operator used wrong calibration tape |
| DataStreams: | sgpsondeC1.00, sgpsondeC1.a0, sgpsondeC1.a1, sgpsondewndcalcC1.c1, sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | It appears as if the operators had a problem with the original sounding and launched a second radiosonde. Apparently they used the calibration tape that came with the first radiosonde (serial number 943156405) in place of the one that was correct for the second radiosonde (sn 943156406) and all the data are bad after the first sample (surface values). |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondeC1.a0:
sgpsondewrpnC1.00:
sgpsondewndcalcC1.c1:
sgpsondeC1.a1:
sgpsondeC1.00:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/25/2000 | 0533 | 07/25/2000 | 0724 |
| Subject: | SGP/SONDE/C1 - Incorrect absolute pressure |
| DataStreams: | sgpsondewndcalcC1.c1, sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | The surface pressure (983.5 hPa) reported by this radiosonde (sn 94315713) is substantially higher than that reported by the THWAPS (~977) or by the sondes used in the previous and following soundings (976.6, 977.3). This may be a calibration problem or a mechanic problem on launch. The pressure values reported in the remainder of the sounding are consistent with the reported surface pressure, so the altitudes should be correct. The absolute pressure values may be high by about 5 hPa. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.00:
sgpsondewndcalcC1.c1:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/03/2000 | 2030 | 11/03/2000 | 2030 |
| Subject: | SGP/SONDE/C1 - Incorrect surface temperature |
| DataStreams: | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | The value for air temperature at the surface in this file is 23.3 degC. This value is too high and resulted from incorrect data entry (typographic mistake) by the operator. The true value as determined from the operator pre-launch logs is 12.3 degC. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.00:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/16/2000 | 2210 | 02/16/2000 | 2250 |
| 09/21/2000 | 1423 | 09/21/2000 | 1434 |
| 09/21/2000 | 1506 | 09/21/2000 | 1517 |
| 09/26/2000 | 1426 | 09/26/2000 | 1434 |
| 10/02/2000 | 1732 | 10/02/2000 | 1752 |
| 10/02/2000 | 2052 | 10/02/2000 | 2107 |
| 10/03/2000 | 1406 | 10/03/2000 | 1421 |
| 09/06/2001 | 1900 | 09/06/2001 | 2000 |
| Subject: | SGP/MWR/C1 - calibration checks |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | The MWR calibration was checked by a cryogenic (liquid nitrogen) blackbody target or (in the case of the Sept 2001 time period) by pointing the mirror at an internal blackbody target. The brightness temperatures and vap and liq retrievals are not representative of the sky/atmosphere. |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/05/2000 | 1955 | 09/18/2000 | 2145 |
| Subject: | SGP/MWR/C1 - Time drift |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | On 9/18/00, I found that the time on the MWR laptop was 1m 21s slow. The Dimension4 utility had last synchronized the time on 5/5/00. Found that the network DNS settings had been disabled. Added the DNS entry for ntp host CF10. Dimension4 synchronized the clock by adding 80.91s. The time had drifted at a rate of -0.59s/day. |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/17/2000 | 0000 | 01/24/2001 | 1600 |
| Subject: | SGP/MWR/C1 - IRT failure |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | The IRT was damaged by internal moisture causing sky temperature measurements that are negatively biased compared to those from the AERI. IRT#0517 was returned to the manufacturer for repair and was replaced with spare IRT#1254. |
| Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/19/1994 | 0000 | 11/27/1998 | 1930 |
| Subject: | SGP/MWR/C1 - IRT not insulated |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | The downwelling IRT was insufficiently insulated to maintain an internal reference temperature above 0 degrees C (P971213.1). Measurements of sky temperature were over-estimated when instrument was below freezing. |
| Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/31/2002 | 2034 | 11/05/2002 | 1815 |
| Subject: | SGP/MWR/B4/C1 - LOS cycle skipping |
| DataStreams: | sgpmwrlosB4.a1, sgpmwrlosB4.b1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | When MWR software version 4.12 was installed at the SGP, it was observed that the MWRs at CF and BF4 skip line-of-sight (LOS) observing cycles. In LOS mode, the software begins an observing cycle at 0, 20, and 40 seconds after the minute to provide 3 LOS cycles per minute. If a cycle is delayed so that it takes more than 20 seconds to complete, then the next start time is missed, the cycle is skipped, and the data that would have been acquired are lost. It was demonstrated that the interaction with the IRT at CF slowed the MWR observing cycle noticeably and contributed significantly to the LOS cycle skipping. The IRT was removed from the MWR on 5 November 2002 and the LOS cycle skipping at the CF was resolved. The IRT data are now available in a new separate datastream: sgpirtC1.a1 (and soon sgpirt2sC1.a1). The BF4 cycle skipping may have resulted from a combination of an additional air temperature sensor on this instrument and the use of a fiber optic cable. However, the cycle skipping on this instrument appears to have abated without modifications to the instrument configuration. |
| Measurements: | sgpmwrlosB4.b1:
sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
sgpmwrlosB4.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/17/1999 | 1800 | 07/31/2002 | 2034 |
| Subject: | SGP/MWR/C1 - Intermittent Negative Sky Brightness Temperatures |
| DataStreams: | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | Several related and recurring problems with the SGP MWRs have been reported dating back to 1999. These problems were due to the occurrence of blackbody signals (in counts) that were half of those expected. The symptoms included noisy data (especially at Purcell), spikes in the data (especially at Vici), negative brightness temperatures, and apparent loss of serial communication between the computer and the radiometer, which results in a self-termination of the MWR program (especially at the CF). Because these all initially appeared to be hardware-related problems, the instrument mentor and SGP site operations personnel (1) repeatedly cleaned and replaced the fiber optic comm. components, (2) swapped radiometers, (3) sent radiometers back to Radiometrics for evaluation (which has not revealed any instrument problems), and (4) reconfigured the computer's operating system. Despite several attempts to isolate and correct it, the problem persisted. It became apparent that some component of the Windows98 configuration conflicted with the DOS-based MWR program or affected the serial port or the contents of the serial port buffer. This problem was finally corrected by upgrading the MWR software with a new Windows-compatible program. |
| Measurements: | sgp5mwravgC1.c1:
sgpmwrlosC1.b1:
sgp1mwravgC1.c1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/18/2002 | 0000 | 02/10/2003 | 2359 |
| Subject: | SGP/MWR/C1 - Incorrect min and max values |
| DataStreams: | sgpmwrlosC1.b1 |
| Description: | The values of valid_min and valid_max applied to fields tkxc and tknd were incorrect. They should be 303 and 333, respectively. |
| Measurements: | sgpmwrlosC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/22/2003 | 2115 | 09/30/2004 | 1835 |
| Subject: | SGP/MWR/C1 - no air temperature signal |
| DataStreams: | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | When the new blower was upgraded by Radiometrics and reinstalled on the MWR, the air temperature sensor failed to properly report. It was determined that the wires carrying the signal to the analog board did not conform to the standard expected by the upgraded blower. The problem was corrected by changing the wiring. |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/01/1999 | 0000 | 12/21/1999 | 2359 |
| 11/10/2000 | 0000 | 12/08/2000 | 2359 |
| 01/26/2001 | 0000 | 03/05/2001 | 2359 |
| 12/18/2001 | 0000 | 12/31/2001 | 2359 |
| 02/11/2002 | 0000 | 02/28/2002 | 2359 |
| 02/19/2003 | 0000 | 03/26/2003 | 2359 |
| 10/15/2003 | 0000 | 11/03/2003 | 2359 |
| Subject: | SGP/MWR/C1 - Wet window flag "on" more frequently than expected |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | The wet window flag was set "on" more frequently than expected during the time periods specified. This indicates the heater has been running more than necessary. In most instances the moisture sensitivity was adjusted at the end of these periods. |
| Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/21/2004 | 2114 | 09/24/2004 | 1354 |
| 09/26/2004 | 2332 | 09/27/2004 | 0317 |
| 09/27/2004 | 1214 | 09/30/2004 | 1820 |
| Subject: | SGP/MWR/C1 - Instrument problem |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | The MWR mixer temperature, blackbody temperature, and moisture flag are incorrect. This began when the instrument was returned to service after the analog board was temporarily removed to check the presence and absence of certain resistors. The board must have been accidently damaged during this process. |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/30/2004 | 1835 | 10/13/2004 | 2118 |
| Subject: | SGP/MWR/C1 - thermal instability |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | The analog board was replaced with a spare (D041001.3) with a reference temperature that was set too low (306 K) so that during periods of high ambient temperature, the instrument became thermally unstable. The problem was corrected when the temperature setting was increased (to 311 K). |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/21/2004 | 1643 | 11/11/2004 | 2100 |
| Subject: | SGP/MWR/C1 - Reprocess: wrong retrievals |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1, sgpqmemwrcolC1.c1 |
| Description: | When the computer and core configuration were upgraded, retrieval coefficients for BF1 were accidently included in the configuration file. The correct coefficients for CF1 were applied when the configuration file was updated. |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpqmemwrcolC1.c1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/20/2003 | 1558 | 08/22/2003 | 2059 |
| Subject: | SGP/MWR/C1 - spare instrument |
| DataStreams: | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | The spare MWR, S.N. 04, was installed while the production instrument, S.N. 10, was returned to the manufacturer for upgrades. |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/16/2002 | 2000 | 06/28/2005 | 2300 |
| Subject: | SGP/MWR/C1 - REPROCESS - Revised Retrieval Coefficients |
| DataStreams: | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1, sgpqmemwrcolC1.c1 |
| Description: | IN THE BEGINNING (June 1992), the retrieval coefficients used to derive the precipitable water vapor (PWV) and liquid water path (LWP) from the MWR brightness temperatures were based on the Liebe and Layton (1987) water vapor and oxygen absorption model and the Grant (1957) liquid water absorption model. Following the SHEBA experience, revised retrievals based on the more recent Rosenkranz (1998) water vapor and oxygen absorption models and the Liebe (1991) liquid waer absorption model were developed. The Rosenkranz water vapor absorption model resulted a 2 percent increase in PWV relative to the earlier Liebe and Layton model. The Liebe liquid water absorption model decreased the LWP by 10% relative to the Grant model. However, the increased oxygen absorption caused a 0.02-0.03 mm (20-30 g/m2) reduction in LWP, which was particularly significant for low LWP conditions (i.e. thin clouds encountered at SHEBA). Recently, it has been shown (Liljegren, Boukabara, Cady-Pereira, and Clough, TGARS v. 43, pp 1102-1108, 2005) that the half-width of the 22 GHz water vapor line from the HITRAN compilation, which is 5 percent smaller than the Liebe and Dillon (1969) half-width used in Rosenkranz (1998), provided a better fit to the microwave brightness temperature measurements at 5 frequencies in the range 22-30 GHz, and yielded more accurate retrievals. Accordingly, revised MWR retrieval coefficients have been developed using MONORTM, which utilizes the HITRAN compilation for its spectroscopic parameters. These new retrievals provide 3 percent less PWV and 2.6 percent greater LWP than the previous retrievals based on Rosenkranz (1998). Although the MWR data will be reprocessed to apply the new monortm-based retrievals, for most purposes it will be sufficient to correct the data using the following factors: PWV_MONORTM = 0.9695 * PWV_ROSENKRANZ LWP_MONORTM = 1.026 * LWP_ROSENKRANZ The Rosenkranz-based retrieval coefficients became active as follows (BCR 456): SGP/C1 (Lamont) 4/16/2002, 2000 SGP/B1 (Hillsboro) 4/12/2002, 1600 SGP/B4 (Vici) 4/15/2002, 2300 SGP/B5 (Morris) 4/15/2002, 2300 SGP/B6 (Purcell) 4/16/2002, 2200 SGP/E14(Lamont) 4/16/2002, 0000 NSA/C1 (Barrow) 4/25/2002, 1900 NSA/C2 (Atqasuk) 4/18/2002, 1700 TWP/C1 (Manus) 5/04/2002, 0200 TWP/C2 (Nauru) 4/27/2002, 0600 TWP/C3 (Darwin) inception The MONORTM-based retrieval coefficients became active as follows (BCR 984): SGP/C1 (Lamont) 6/28/2005, 2300 SGP/B1 (Hillsboro) 6/24/2005, 2100 SGP/B4 (Vici) 6/24/2005, 2100 SGP/B5 (Morris) 6/24/2005, 2100 SGP/B6 (Purcell) 6/24/2005, 1942 SGP/E14(Lamont) 6/28/2005, 2300 NSA/C1 (Barrow) 6/29/2005, 0000 NSA/C2 (Atqasuk) 6/29/2005, 0000 TWP/C1 (Manus) 6/30/2005, 2100 TWP/C2 (Nauru) 6/30/2005, 2100 TWP/C3 (Darwin) 6/30/2005, 2100 PYE/M1 (Pt. Reyes) 4/08/2005, 1900** ** At Pt. Reyes, the original retrieval coefficients implemented in March 2005 were based on a version of the Rosenkranz model that had been modified to use the HITRAN half-width at 22 GHz and to be consistent with the water vapor continuum in MONORTM. These retrievals yield nearly identical results to the MONORTM retrievals. Therefore the Pt. Reyes data prior to 4/08/2005 may not require reprocessing. |
| Measurements: | sgpmwrtipC1.a1:
sgp5mwravgC1.c1:
sgpmwrlosC1.b1:
sgp1mwravgC1.c1:
sgpqmemwrcolC1.c1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/28/2005 | 1400 | 08/05/2005 | 1700 |
| Subject: | SGP/MWR/C1 - Instrument noise problem |
| DataStreams: | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | Various variables including the mixer temperatures were very noisy. After several attempts to fix the problem, the instrument was taken off line and returned to the manufacturer for repair. |
| Measurements: | sgpmwrtipC1.a1:
sgp5mwravgC1.c1:
sgpmwrlosC1.b1:
sgp1mwravgC1.c1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/05/2005 | 1701 | 08/30/2005 | 2100 |
| Subject: | SGP/MWR/C1 - Instrument offline |
| DataStreams: | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | Instrument was taken offline and returned to manufacturer for repair. Data are missing and unrecoverable. |
| Measurements: | sgpmwrtipC1.a1:
sgp5mwravgC1.c1:
sgpmwrlosC1.b1:
sgp1mwravgC1.c1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/31/2002 | 2027 | 08/04/2005 | 1959 |
| Subject: | SGP/MWR/C1 - New software version (4.15) installed |
| DataStreams: | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | A problem began with the installation of MWR.EXE version 4.12 in July 2002. The software had been upgraded from a "DOS" to a "Windows"-compiled program to address an earlier problem. The software upgrade corrected the earlier problem but introduced a new one that caused line-of-sight observing cycles to be skipped, a 15% reduction in the number of tip curves, and saturation of CPU usage. Software versions 4.13 and 4.14 also produced these problems. The new MWR software, version 4.15, was installed on 08/04/2005. As a consequence of this upgrade, the tip curve frequency increased. The tip cycle time decreased from ~60s to ~50s. |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/16/2005 | 0000 | 11/29/2005 | 0000 |
| Subject: | SGP/MWR/C1 - computer problem |
| DataStreams: | sgpmwrC1.00, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | The computer motherboard failed. The replacement motherboard sent by dell did not work. A new computer was installed on 11/28. Operations of the radiometer resumed on 11/29 |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpmwrC1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/08/2005 | 0000 | 11/16/2005 | 0000 |
| Subject: | SGP/MWR/C1 - Power supply failure |
| DataStreams: | sgpmwrC1.00, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | On 10/08 a power supply failure caused a catastrophic failure of the power supply board. The instrument had to be shipped to the vendor for repair. The instrument was returned on 11/15 and re-installed on 11/16. |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpmwrC1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/13/2006 | 1200 | 07/28/2006 | 1600 |
| Subject: | SGP/MWR/C1 - Spikes in ambient temperature readings |
| DataStreams: | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | There are intermittent spikes in the Tkair temperature (T ~ 400 K). On 7/28 the sensor was cleaned and the instrument power cycled following a power outage. Readings came back to normal. |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/01/2006 | 2300 | 07/03/2006 | 1400 |
| Subject: | SGP/MWR/C1 - Missing data |
| DataStreams: | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | Data are missing because of a SW problem |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/28/2006 | 2100 | 12/01/2006 | 1900 |
| Subject: | SGP/MWR/C1 - Instrument testing |
| DataStreams: | sgpmwrC1.00, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | On 11/28 the insrument was removed and taken inside for testing |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpmwrC1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/12/2007 | 0000 | 01/15/2007 | 0000 |
| Subject: | SGP/MWR/C1/E14 - Freezing rain-Incorrect rain flag |
| DataStreams: | sgpmwrlosC1.b1, sgpmwrlosE14.b1, sgpmwrtipC1.a1, sgpmwrtipE14.a1 |
| Description: | Between 01/12 and 01/15 brightness temperatures show high values (Tb > 100 K) indicative of rain, however the wet_window flag is 0 (indicative of no rain). During that time there where freezing conditions with ice pellets that were not detected by the sensor. The high brightness temperatures may be due to melting ice on the window. |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpmwrtipE14.a1:
sgpmwrlosE14.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/14/2007 | 0000 | 08/03/2007 | 1508 |
| Subject: | SGP/MWR/C1 - Noisy data |
| DataStreams: | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | Since 7/14 the MWR is experiencing intermittent periods of increased noise. The cause for this is under investigation. |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/19/2007 | 2136 | 11/22/2007 | 1400 |
| Subject: | SGP/MWR/C1 - Reprocess: Radiometer reinstalled- Please reprocess |
| DataStreams: | sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | After the radiometer was reinstalled it had to update the calibration coefficients. Data will be reprocessed |
| Measurements: | sgpmwrtipC1.a1:
sgp5mwravgC1.c1:
sgpmwrlosC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/21/1993 | 1809 | 07/23/1993 | 1541 |
| 08/07/1993 | 2143 | 08/09/1993 | 1308 |
| 08/14/1993 | 2233 | 08/16/1993 | 1300 |
| 08/29/1993 | 1207 | 08/31/1993 | 1206 |
| 09/17/1993 | 2158 | 09/20/1993 | 1311 |
| 10/02/1993 | 1612 | 10/04/1993 | 1338 |
| 10/09/1993 | 0741 | 10/11/1993 | 1319 |
| 11/12/1993 | 1207 | 11/15/1993 | 1413 |
| 11/19/1993 | 2027 | 11/21/1993 | 1957 |
| 12/14/1993 | 2300 | 03/21/1994 | 1759 |
| 03/28/1994 | 1459 | 03/30/1994 | 2225 |
| 05/16/1994 | 1900 | 05/19/1994 | 2018 |
| 06/22/1994 | 1600 | 07/11/1994 | 1859 |
| 07/16/1994 | 0300 | 07/19/1994 | 2006 |
| 09/03/1994 | 1647 | 09/05/1994 | 1341 |
| 09/09/1994 | 2325 | 09/11/1994 | 1543 |
| 12/17/1994 | 0049 | 12/19/1994 | 1441 |
| 01/05/1995 | 0000 | 01/05/1995 | 2359 |
| 01/28/1995 | 0054 | 01/30/1995 | 1443 |
| 04/01/1995 | 0000 | 04/03/1995 | 1610 |
| 05/09/1995 | 2200 | 05/11/1995 | 2350 |
| 06/24/1995 | 0903 | 06/26/1995 | 0159 |
| 07/07/1995 | 1625 | 07/10/1995 | 1409 |
| 07/19/1995 | 1741 | 07/21/1995 | 1906 |
| 07/28/1995 | 1900 | 07/31/1995 | 1918 |
| 08/22/1995 | 1616 | 08/25/1995 | 2359 |
| 12/01/1995 | 1434 | 01/11/1996 | 2214 |
| 01/12/1996 | 2000 | 01/23/1996 | 2030 |
| 01/23/1996 | 2332 | 02/08/1996 | 2359 |
| 08/06/1996 | 0000 | 08/06/1996 | 2359 |
| 09/04/1996 | 1910 | 09/08/1996 | 2359 |
| 09/14/1996 | 0700 | 09/16/1996 | 1759 |
| 09/30/1996 | 0000 | 09/30/1996 | 2359 |
| 12/01/1996 | 0000 | 12/01/1996 | 2359 |
| 07/01/1997 | 0000 | 07/01/1997 | 2359 |
| 02/20/1998 | 2339 | 02/22/1998 | 0042 |
| 05/04/1998 | 0000 | 05/04/1998 | 2359 |
| 07/18/1998 | 0337 | 07/20/1998 | 1355 |
| 09/28/1998 | 0000 | 09/28/1998 | 2359 |
| 10/10/1998 | 2359 | 10/12/1998 | 1959 |
| 10/17/1998 | 1705 | 10/19/1998 | 1535 |
| 12/25/1998 | 2233 | 12/28/1998 | 2026 |
| 02/06/1999 | 1235 | 02/08/1999 | 1652 |
| 03/13/1999 | 2048 | 03/15/1999 | 2040 |
| 07/23/1999 | 2059 | 07/26/1999 | 1408 |
| 12/04/1999 | 0800 | 12/06/1999 | 1821 |
| 01/07/2000 | 1446 | 02/02/2000 | 2224 |
| 05/24/2000 | 1455 | 05/31/2000 | 1505 |
| 06/06/2000 | 1620 | 06/14/2000 | 1451 |
| 09/01/2000 | 2200 | 09/05/2000 | 1526 |
| 09/15/2000 | 2057 | 09/18/2000 | 1339 |
| 09/23/2000 | 1236 | 09/25/2000 | 1430 |
| 01/13/2001 | 2011 | 01/16/2001 | 1647 |
| 02/24/2001 | 0230 | 02/26/2001 | 1508 |
| 03/03/2001 | 0701 | 03/05/2001 | 1546 |
| 03/10/2001 | 0702 | 03/12/2001 | 1535 |
| 03/17/2001 | 0702 | 03/19/2001 | 1422 |
| 03/24/2001 | 0703 | 03/26/2001 | 1516 |
| 03/30/2001 | 2038 | 04/02/2001 | 1423 |
| 05/05/2001 | 1042 | 05/07/2001 | 1514 |
| 05/18/2001 | 1534 | 05/21/2001 | 1451 |
| 06/22/2001 | 2200 | 06/25/2001 | 1438 |
| 06/30/2001 | 0616 | 07/02/2001 | 1435 |
| 07/28/2001 | 1944 | 07/30/2001 | 1357 |
| 08/24/2001 | 1348 | 08/27/2001 | 1751 |
| 09/07/2001 | 1842 | 09/10/2001 | 1439 |
| 09/15/2001 | 1533 | 09/17/2001 | 1459 |
| 10/13/2001 | 0033 | 10/15/2001 | 1526 |
| 11/03/2001 | 0840 | 11/05/2001 | 1613 |
| 11/10/2001 | 0558 | 11/13/2001 | 1518 |
| 11/16/2001 | 1701 | 11/19/2001 | 1706 |
| 12/21/2001 | 2153 | 12/24/2001 | 1442 |
| 01/30/2002 | 0845 | 02/11/2002 | 1632 |
| 03/02/2002 | 0339 | 03/04/2002 | 1533 |
| 03/09/2002 | 0340 | 03/11/2002 | 1621 |
| 06/26/2002 | 1639 | 06/28/2002 | 2057 |
| 09/01/2002 | 1002 | 09/03/2002 | 1332 |
| 12/21/2002 | 1124 | 12/23/2002 | 1510 |
| 01/04/2003 | 0703 | 01/06/2003 | 1529 |
| 08/09/2003 | 0037 | 08/11/2003 | 1456 |
| 08/23/2003 | 2101 | 08/25/2003 | 1456 |
| 10/12/2003 | 2025 | 10/14/2003 | 1414 |
| 11/29/2003 | 1840 | 12/01/2003 | 1502 |
| 01/24/2004 | 0743 | 01/26/2004 | 1505 |
| 02/14/2004 | 2316 | 02/17/2004 | 1520 |
| 09/04/2004 | 0250 | 09/07/2004 | 1419 |
| 10/09/2004 | 0745 | 10/11/2004 | 1739 |
| 10/16/2004 | 2250 | 10/18/2004 | 1355 |
| 11/13/2004 | 1849 | 11/15/2004 | 1521 |
| 12/03/2004 | 1940 | 12/06/2004 | 1454 |
| 01/15/2005 | 0652 | 01/18/2005 | 1446 |
| 01/22/2005 | 1449 | 01/24/2005 | 1444 |
| 06/10/2005 | 2118 | 06/13/2005 | 1603 |
| 08/05/2005 | 1701 | 08/30/2005 | 2001 |
| 10/07/2005 | 1658 | 11/16/2005 | 1945 |
| 11/18/2005 | 1801 | 11/21/2005 | 1521 |
| 11/23/2005 | 2201 | 11/25/2005 | 1550 |
| 11/26/2005 | 0101 | 11/28/2005 | 1543 |
| 12/03/2005 | 1043 | 12/05/2005 | 1559 |
| 01/14/2006 | 1822 | 01/17/2006 | 1512 |
| 01/21/2006 | 0708 | 01/23/2006 | 1515 |
| 02/03/2006 | 1903 | 02/06/2006 | 1533 |
| 02/25/2006 | 0730 | 02/27/2006 | 1420 |
| 07/01/2006 | 2225 | 07/03/2006 | 1413 |
| 11/28/2006 | 2143 | 12/01/2006 | 1911 |
| 06/09/2007 | 1150 | 06/11/2007 | 1300 |
| 07/07/2007 | 1642 | 07/09/2007 | 1304 |
| 08/03/2007 | 1601 | 11/19/2007 | 2135 |
| 12/22/2007 | 2112 | 12/24/2007 | 1504 |
| 05/25/2008 | 1815 | 05/27/2008 | 1335 |
| 06/06/2008 | 1512 | 06/09/2008 | 0238 |
| Subject: | SGP/MWR/C1 - Missing data |
| DataStreams: | sgpmwrlosC1.b1 |
| Description: | Data are missing and unrecoverable. |
| Measurements: | sgpmwrlosC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/25/2008 | 1900 | 05/27/2008 | 1300 |
| Subject: | SGP/MWR/C1 - Missing data |
| DataStreams: | sgp5mwravgC1.c1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | Data are missing due to a software problem |
| Measurements: | sgpmwrtipC1.a1:
sgp5mwravgC1.c1:
sgpmwrlosC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/13/1994 | 1131 | 08/03/1994 | 1430 |
| Subject: | Possible error in humidity ground check |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondewrpnC1
Subject: Possible error in humidity ground check
Date Submitted: 8/3/94
Submitted By: Barry Lesht _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement:
What level data: (raw,a0,a1,b1,c1 etc): raw, a0, a1
What location was the data collected at: CF
Period of time in question
Begin Date 7/13/94 Time 11:31 (GMT)
End Date 8/ 3/94 Time 14:30 (GMT)
Data should be labeled:
_X_ questionable ___ All data fields affected
___ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
We suspect that the dessicant in the bbss ground check set (located
only at the central facility) has become saturated and is no longer
providing a 0 %RH environment against which to check the sonde RH sensor.
This would result in a bias in the correction for humidity for
those soundings that were done during the time the dessicant was bad.
Examination of the data suggests that the potential errors are small,
(on the order of a few percent RH), but sufficiently different from previous
corrections to warrant temporary suspension of the ground check procedure.
A review of the data collected since the beginning of the year shows no
trend in humidity correction until July 13, 1994. The last positive
humidity correction was recorded on July 12, 1994 and since then has been
noticably (though slightly) downward.
The humidity correction is applied linearly. That is, U = U' + (Uo - Uo')
where U is the humidity with the ground check applied (this is the RH
value in our data stream), U' is the humidity measured at the sonde before
correction, Uo is the reference humidity (assumed to be 0%), and Uo' is
is the humidity measured by the sonde in the ground check set. Users
can recover the RH measured at the sonde by subtracing the global attribute
"humidity-correction" from the RH values in the data set. Based on our
experience with the ground check data, we expect the RH values measured
at the sonde to be accurate within +/-2% RH.
Other observations/measurements impacted by this problem:
Any measurement derived from the sonde RH measurement, for example
dew point temperature, water vapor mixing ratio).
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data warning user that RH may be biased high by an unknown amount,
probably not exceeding 2% RH.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/01/1994 | 0000 | 08/16/1994 | 2359 |
| Subject: | SGP/MWR/C1 - IRT rain lid removal |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | The IR thermometer (or IRT) was deployed at the SGP central facility in
January 1994 with an automatic mechanism which closed a protective lid
over the zenith-viewing lens when a moisture detector indicated
condensation or precipitation.
Since that time the 120 VAC-to-12 VAC transformer in the lid mechanism
has failed 5 times with an average downtime of two weeks. In addition,
the collar by which the (normally open) lid is attached to the lens
barrel of the IRT has made it difficult for site operations personnel
to observe the condition of the IRT lens. As a result, dirt and
insects have been able to accumulate on the lens. This has resulted in
long periods of invalid data.
To alleviate these problems the lid mechanism was removed from service
on 16 August at my recommendation.
It is anticipated that condensation and precipitation will result in
invalid data. However, these events should be readily detectable
because the observed IR temperature will closely match the ambient
temperature (e.g. the temperature of the moisture on the lens) which is
usually much greater than the sky or cloud base temperature normally
measured. I believe that this will not result in a large increase in
invalid data because these data would have been invalid anyway when the
lid was closed. (This situation is now the same as for the other
radiometers at the site.)
In addition, removing the attaching collar from the lens barrel will
prevent insects from nesting in it, and will permit site operations
personnel easy access to the lens so that they may more easily maintain
it in a clean condition.
A summary of the quality of the IR thermometer data in general,
including notes on the performance of the protective lid, follows:
JANUARY 1994
19-JAN: Operational. No IR data collected.
FEBRUARY 1994
2-FEB: Failure of lid reported. Transformer burned out.
15-FEB: IRT returned to service.
24-FEB: Valid data begin.
MARCH 1994
3-MAR: Failure of lid reported. Transformer burned out.
8-MAR: IRT returned to service.
8-MAR: Cable problems reported.
17-MAR: Cable problems resolved. IRT returned to service.
17-27-MAR: Comparison with AERI indicates IRT 1-10 deg C higher;
increasing error with decreasing temperatures. Probably
due to dirt/debris on lens. Also, IRT calibration not valid
below -50 deg C (223 K).
21-MAR: Problems with O-ring on lid sticking reported/repaired.
APRIL 1994
Data values below -50 deg C (223 K) not valid - below range of
calibration. Otherwise data within 2-3 degrees of AERI.
24-APR: Large (10-20 Deg C) offset between IRT and AERI develops.
MAY 1994
7-MAY: Mentor visits site, observes spider's nest and dead insects
inside collar attaching lid to lens barrel in optical path of
instrument. Probably the source of the offset between IRT and
AERI during late and April.
9-MAY: Insects removed, lens cleaned by site operations personnel.
Agreement between IRT and AERI within 1 deg C.
23-MAY: Failure of lid reported. Transformer burned out.
JUNE 1994
22-JUN: Rebuilt/redesigned lid mechanism put in service; data collection
computer fails same day.
JULY 1994
11-JUL: Computer returned to service.
Agreement between IRT and AERI within 1 deg C.
22-JUL: Failure of lid reported. Transformer burned out.
AUGUST 1994
3-AUG: IRT returned to service.
12-AUG: Failure of lid reported. Transformer burned out.
16-AUG: Lid mechanism abandoned. |
| Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/30/1994 | 2326 | 10/30/1994 | 2326 |
| Subject: | Bad surface RH value in sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: SGPSONDEC1
Subject: Bad surface RH value in sounding 10/30/94 23:26
Date Submitted: 11/4/94
Submitted By: Barry Lesht _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: All
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: SGP/CF
Period of time in question
Begin Date 10/30/94 Time 23:26 (GMT)
End Date 10/30/94 Time 23:26 (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
It looks as though an incorrect value was entered by the operator for
surface relative humidity. The value entered 16% is much lower than the
first value given by the radiosonde 80%. The rest of the sounding is
consistent with humid, rainy conditions, suggesting a typographical
error (16 instead of 76?).
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/06/1994 | 1733 | 11/06/1994 | 1733 |
| Subject: | Bad surface RH value in sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: SGPSONDEC1
Subject: Bad surface RH value in sounding 11/6/94 17:33
Date Submitted: 11/8/94
Submitted By: Barry Lesht _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: All
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: SGP/CF
Period of time in question
Begin Date 11/06/94 Time 17:33 (GMT)
End Date 11/06/94 Time 17:33 (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
An incorrect value was entered by the operator for surface relative humidity.
The value as entered as 4% should be 45%. This typographical error was
noted in the site operations log by the operator shortly after it occurred.
The remaining values in the sounding should be fine.
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/21/1993 | 1640 | 08/03/1994 | 1430 |
| Subject: | CF Sonde Ground Check Corrections |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: SGPSONDEC1
Subject: CF Sonde Ground Check Corrections
Date Submitted: 11/8/94
Submitted By: Barry Lesht _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondec1
What level data: (raw,a0,a1,b1,c1 etc): all
What location was the data collected at: SGP/CF
Period of time in question
Begin Date 01/21/93 Time 16:40 (GMT)
End Date 08/03/94 Time 14:30 (GMT)
Data should be labeled:
_?_ questionable ___ All data fields affected
___ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
Between 1/21/93 and 8/3/94 all radiosondes launched from the central
facility were ground checked before launch. The ground check procedure
consists of placing the sonde sensor arm into a sealed, dessicated chamber
containing a certified calibrated mercury thermometer, allowing the sonde
to equilibrate, and comparing the sonde output readings for RH and
temperature to the thermometer reading and an assumed 0% RH. All data after
launch were "corrected" to account for any differences between the sonde
output and the reference conditions in the ground check set.
Analysis of the population of ground check values shows that the average
RH correction was 0% RH and average temperature correction was -0.4 degC.
Because there is some question as to whether applying the ground check
correction increases or decreases the accuracy of the output data, some
investigators may wish to remove the effect of the ground check before
using the data in their analyses. Ground checks were suspended on 8/3/94.
The algorithms for removing the ground check are:
RH (without ground check) = RH (as reported) - humidity_correction
Temp (without ground chk) = [Temp (as reported) - FACTOR1]/FACTOR2 where
FACTOR1 = [(90*temperature_correction)/(tref+90)
FACOTR2 = [1+(temperature_correction)/(tref+90)
The variables "humidity_correction" and "temperature_correction" are
metadata contained in the netCDF data files from 5/20/93 to 8/3/94.
Between 1/21/93 and 5/20/93 these variables were misnamed and are not
easily accessible via FORTRAN (see PIF 940917.1).
The variable tref is the actual temperature reported by the radiosonde
while in the ground check set. This variable is not included in the
netCDF file and can be estimated by using a value of 15 degC. The
correction function is relatively insensitive to variations in this
value. (see PIF 940917.2)
FORTRAN routines for reading the metadata and for applying the algorithms
to produce "uncorrected" data are available from the instrument mentor.
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Send (another) notice to users of the data.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/09/1994 | 1133 | 12/09/1994 | 1133 |
| Subject: | Questionable initial values sounding 941209:1133 |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondec1
Subject: Questionable initial values sounding 941209:1133
Date Submitted: 12/12/94
Submitted By: Barry Lesht _x_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: All
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: SGP/CF
Period of time in question
Begin Date 12/09/94 Time 11:33:00 (GMT)
End Date 12/09/94 Time 11:33:02 (GMT)
Data should be labeled:
_x_ questionable ___ All data fields affected
___ incorrect _x_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
It appears that incorrect values were entered for surface temperature and
relative humidity in the subject sounding. The values entered were
temp = 25.1 degC, rh = 18 %. The next values in the sounding are
temp =- 2.4 degC, rh = 70 %. Because these do not appear to be simple
typographical errors, the values should be noted as questionable rather
than incorrect until the paper log can be consulted by site ops.
Initial values for subsequent soundings seem fine.
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Check paper log and flag data. Note for possible correction later.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/02/1995 | 1132 | 01/02/1995 | 1132 |
| Subject: | Questionable surface value 1/2/95 11:32 |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondec1wrpn
Subject: Questionable surface value 1/2/95 11:32
Date Submitted: 1/9/95
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondec1
What level data: (raw,a0,a1,b1,c1 etc): all
What location was the data collected at: cf
Period of time in question
Begin Date 1/02/95 Time 11:32:00 (GMT)
End Date 1/02/95 Time 11:32:02 (GMT)
Data should be labeled:
_x_ questionable ___ All data fields affected
___ incorrect ___ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
It appears that incorrect surface values of temperature and relative
humidity were entered for the subject sounding.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/03/1995 | 1129 | 01/03/1995 | 1129 |
| Subject: | Questionable surface value 1/3/95 11:29 |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondec1wrpn
Subject: Questionable surface value 1/3/95 11:29
Date Submitted: 1/9/95
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondec1
What level data: (raw,a0,a1,b1,c1 etc): all
What location was the data collected at: cf
Period of time in question
Begin Date 1/03/95 Time 11:29:00 (GMT)
End Date 1/03/95 Time 11:29:02 (GMT)
Data should be labeled:
_x_ questionable ___ All data fields affected
___ incorrect ___ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
It appears that incorrect surface values of temperature and relative
humidity were entered for the subject sounding.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/01/1994 | 0000 | 12/31/1994 | 2359 |
| Subject: | SGP/MWR/C1 - Data dropouts due to serial comm problems |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | Conflicts between the drop shipper program and the MWR operation program resulted in serial communication problems which ultimately manifested as spikes and dropouts in the data. |
| Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/22/1995 | 0530 | 02/22/1995 | 0730 |
| Subject: | Reprocess: Sounding 950222:0530 done in research mode |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform:
Subject: Sounding 950222:0530 Done in Research Mode
Date Submitted: 3/4/95
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: SGPSONDEC1
What level data: (raw,a0,a1,b1,c1 etc): ALL
What location was the data collected at: SGP/CF
Period of time in question
Begin Date 2/22/95 Time 05:30 (GMT)
End Date 2/22/95 Time 07:30 (GMT)
Data should be labeled:
___ questionable _X_ All data fields affected
___ incorrect ___ Only some data fields affected
___ wrong calibration
_X_ others
Discussion of Problem: This sounding was done in RESEARCH mode for
both thermodynamic as well as wind data. The
normal mode is to for RESEARCH winds only. As
a result, both the ascending and descending
flights of the sonde are included in the data
file and none of the data are smoothed or
filtered.
Other observations/measurements impacted by this problem: I think that
some of the radiation codes that use the sonde
data as input don't handle the descending samples
well. I'm not sure which ones may be affected.
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.) Users should be notified and,
if (and only if) requested, the sounding could be reprocessed either using
the software developed at the EC or the digi-CORA.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/09/1995 | 0530 | 03/09/1995 | 0530 |
| Subject: | Bad surface values in sounding 3/9/95:0530 |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Bad surface values in sounding 3/9/95:0530
Date Submitted: 3/10/95
Submitted By: _x_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement:
What level data: (raw,a0,a1,b1,c1 etc): all
What location was the data collected at: sgp/cf
Period of time in question
Begin Date 3/09/95 Time 05:30 (GMT)
End Date 3/09/95 Time 05:30 (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_x_ incorrect _x_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem: It appears that the operator entered incorrect
values for the surface temperature and humidity for this sounding. The
entered values are 24.8 degC (temp) and 19 %RH (humidity) which are most
likely the values obtained from the met instruments inside the trailer
rather from the sonde on the launch platfrom. The next sample values of
-3.1 degC (temp) and 81 %RH (humidity) appear to be valid.
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/15/1995 | 1429 | 03/15/1995 | 1629 |
| Subject: | Reprocess: Sounding 950315:1429 done in research mode |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | P950316.1 Barry Lesht
SGP/SONDE.C1.950315.950315 - Sounding 950315:1429 Done in Research Mode
DQR No: Platform:
Subject: Sounding 950315:1429 Done in Research Mode
Date Submitted: 3/4/95
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: SGPSONDEC1
What level data: (raw,a0,a1,b1,c1 etc): ALL
What location was the data collected at: SGP/CF
Period of time in question
Begin Date 3/15/95 Time 14:29 (GMT)
End Date 3/15/95 Time 16:29 (GMT)
Data should be labeled:
___ questionable _X_ All data fields affected
___ incorrect ___ Only some data fields affected
___ wrong calibration
_X_ others
Discussion of Problem: This sounding was done in RESEARCH mode for
both thermodynamic as well as wind data. The
normal mode is to for RESEARCH winds only. As
a result, both the ascending and descending
flights of the sonde are included in the data
file and none of the data are smoothed or
filtered.
Other observations/measurements impacted by this problem: I think that
some of the radiation codes that use the sonde
data as input don't handle the descending samples
well. I'm not sure which ones may be affected.
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.) Users should be notified and,
if (and only if) requested, the sounding could be reprocessed either using
the software developed at the EC or the digi-CORA.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/13/1995 | 1130 | 04/13/1995 | 1330 |
| Subject: | Reprocess: Sounding 950413:1130 done in research mode |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform:
Subject: Sounding 950413:1130 Done in Research Mode
Date Submitted: 4/17/95
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: SGPSONDEC1
What level data: (raw,a0,a1,b1,c1 etc): ALL
What location was the data collected at: SGP/CF
Period of time in question
Begin Date 4/13/95 Time 11:30 (GMT)
End Date 4/13/95 Time 13:30 (GMT)
Data should be labeled:
___ questionable _X_ All data fields affected
___ incorrect ___ Only some data fields affected
___ wrong calibration
_X_ others
Discussion of Problem: This sounding was done in RESEARCH mode for
both thermodynamic as well as wind data. The
normal mode is to for RESEARCH winds only. As
a result, both the ascending and descending
flights of the sonde are included in the data
file and none of the data are smoothed or
filtered.
Other observations/measurements impacted by this problem: I think that
some of the radiation codes that use the sonde
data as input don't handle the descending samples
well. I'm not sure which ones may be affected.
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.) Users should be notified and,
if (and only if) requested, the sounding could be reprocessed either using
the software developed at the EC or the digi-CORA.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/17/1995 | 1429 | 04/17/1995 | 1551 |
| Subject: | Bad surface values in sounding 4/17/95 14:29 |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: SGPSONDEC1
Subject: Bad surface values in sounding 4/17/95 14:29
Date Submitted: 4/19/95
Submitted By: Barry Lesht _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: All
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: SGP/CF
Period of time in question
Begin Date 4/17/95 Time 14:29 (GMT)
End Date 4/17/95 Time 15:51 (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The operator entered incorrect surface values for both RH and pressure.
Because of the way altitude is calculated, the incorrect pressure value
has the effect of making all subsequent altitude values incorrect. The
RH error only affects the first sample.
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/30/1995 | 1630 | 04/30/1995 | 1700 |
| Subject: | SGP/MWR/C1 - IR thermometer calibration check |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | Mentor used an Everest model 1000 ambient temperature target (emis.=0.98) to check the calibration of the Heiman IR pyrometer (IR thermometer). Data collected during this period will be anomalous due to the modifications of the instrument settings required to facilitate the calibration. The emissivity of the instrument was changed to match the target; units were changed to deg C (from K) to match the target LCD units; integration time on the instrument was changed to 3 seconds (from 1 second). Centered the target on the instrument lens and allowed it to rest on the lens barrel so that it filled the field of view of the instrument. Both the instrument LCD and target LCD indicated 16.7 deg C. Noted that although the lens appeared clean, there was some liquid water around the edge which formed a meniscus with the inside of the lens barrel. Wiped this away with a clean, lint-free cotton cloth. Replaced the target on the lens barrel; both instrument and target then indicated 17.1 deg C. Reset the instrument emissivity (=1.0), the units (kelvins) and the integration time (=1 sec). The IRT was deployed in December 1993. Its calibration appears to have been stable since deployment. Liquid water around the edge of the lens appears to be out of the field of view and does not appear to affect the data. |
| Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/11/1995 | 1755 | 08/11/1995 | 1755 |
| Subject: | bad surface tdry value in sounding 17:55 |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: SGPSONDEC1
Subject: Bad surface tdry value in sounding 8/11/95 17:55
Date Submitted: 8/16/95
Submitted By: Barry Lesht _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: All
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: SGP/CF
Period of time in question
Begin Date 8/11/95 Time 17:55 (GMT)
End Date 8/11/95 Time 17:55 (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
An incorrect value was entered by the operator for surface temperature.
The value entered as 28.8 should be 31.8. This error was noted in the
site operations log by the operator shortly after it occurred.
The remaining values in the sounding should be fine.
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/03/1995 | 0000 | 10/03/1995 | 0100 |
| Subject: | Apparent Interference Signal in Sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sondeC1
Subject: Apparent Interference Signal in Sounding CF:951002:2330
Date Submitted: October 6, 1995
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement:
What level data: (raw,a0,a1,b1,c1 etc): All
What location was the data collected at: CF
Period of time in question
Begin Date 10/03/95 Time XX:XX:XX (GMT)
End Date 10/03/95 Time 00:54:12 (GMT)
Data should be labeled:
___ questionable _X_ All data fields affected
_X_ incorrect ___ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem: It appears as if the ground station started to
receive data from a foreign sonde (i.e., not the sonde originally being
tracked) at an altitude of about 14.5 km. At this point the RH signal
drops out, and both the pressure and temperature signals are noisy and
look unnatural.
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/03/1995 | 0000 | 10/03/1995 | 0940 |
| Subject: | Apparent Interference Signal in Sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sondeC1
Subject: Apparent Interference Signal in Sounding CF:951003:0830
Date Submitted: October 6, 1995
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement:
What level data: (raw,a0,a1,b1,c1 etc): All
What location was the data collected at: CF
Period of time in question
Begin Date 10/03/95 Time XX:XX:XX (GMT)
End Date 10/03/95 Time 09:40:20 (GMT)
Data should be labeled:
___ questionable _X_ All data fields affected
_X_ incorrect ___ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem: It appears as if the ground station started to
receive data from a foreign sonde (i.e., not the sonde originally being
tracked) at an altitude of about 14.0 km. At this point the RH signal
drops out, and both the pressure and temperature signals are noisy and
look unnatural.
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/03/1995 | 0000 | 10/03/1995 | 1525 |
| Subject: | Apparent Interference Signal in Sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sondeC1
Subject: Apparent Interference Signal in Sounding CF:951003:1429
Date Submitted: October 6, 1995
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement:
What level data: (raw,a0,a1,b1,c1 etc): All
What location was the data collected at: CF
Period of time in question
Begin Date 10/03/95 Time XX:XX:XX (GMT)
End Date 10/03/95 Time 15:25:24 (GMT)
Data should be labeled:
___ questionable _X_ All data fields affected
_X_ incorrect ___ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem: It appears as if the ground station started to
receive data from a foreign sonde (i.e., not the sonde originally being
tracked) at an altitude of about 12.7 km. At this point the RH signal
drops out, and both the pressure and temperature signals are noisy and
look unnatural.
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/04/1995 | 0000 | 10/04/1995 | 0707 |
| Subject: | Apparent Interference Signal in Sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sondeC1
Subject: Apparent Interference Signal in Sounding CF:951004:0530
Date Submitted: October 6, 1995
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement:
What level data: (raw,a0,a1,b1,c1 etc): All
What location was the data collected at: CF
Period of time in question
Begin Date 10/04/95 Time XX:XX:XX (GMT)
End Date 10/04/95 Time 07:07:50 (GMT)
Data should be labeled:
___ questionable _X_ All data fields affected
_X_ incorrect ___ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem: It appears as if the ground station started to
receive data from a foreign sonde (i.e., not the sonde originally being
tracked) at an altitude of about 12.0 km. At this point the RH signal
drops out, and both the pressure and temperature signals are noisy and
look unnatural.
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/04/1995 | 0000 | 10/04/1995 | 0945 |
| Subject: | Apparent Interference Signal in Sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sondeC1
Subject: Apparent Interference Signal in Sounding CF:951004:0834
Date Submitted: October 6, 1995
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement:
What level data: (raw,a0,a1,b1,c1 etc): All
What location was the data collected at: CF
Period of time in question
Begin Date 10/04/95 Time XX:XX:XX (GMT)
End Date 10/04/95 Time 09:45:30 (GMT)
Data should be labeled:
___ questionable _X_ All data fields affected
_X_ incorrect ___ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem: It appears as if the ground station started to
receive data from a foreign sonde (i.e., not the sonde originally being
tracked) at an altitude of about 11.5 km. At this point the RH signal
and the pressure and temperature signals are noisy and look unnatural.
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/04/1995 | 0000 | 10/04/1995 | 1312 |
| Subject: | Apparent Interference Signal in Sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sondeC1
Subject: Apparent Interference Signal in Sounding CF:951004:1130
Date Submitted: October 6, 1995
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement:
What level data: (raw,a0,a1,b1,c1 etc): All
What location was the data collected at: CF
Period of time in question
Begin Date 10/04/95 Time XX:XX:XX (GMT)
End Date 10/04/95 Time 13:12:02 (GMT)
Data should be labeled:
___ questionable _X_ All data fields affected
_X_ incorrect ___ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem: It appears as if the ground station started to
receive data from a foreign sonde (i.e., not the sonde originally being
tracked) at an altitude of about 17.0 km. At this point the RH signal
drops out and the pressure and temperature signals are noisy and look
unnatural.
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/17/1996 | 2031 | 01/17/1996 | 2031 |
| Subject: | Jump in pressure value upon launch |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: SGPSONDEC1
Subject: Jump in pressure value upon launch 960117:2031
Date Submitted: 1/22/96
Submitted By: Barry Lesht _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondeWRPNC1/ (alt, asc, press)
What level data: (raw,a0,a1,b1,c1 etc): all
What location was the data collected at: SGP/CF
Period of time in question
Begin Date 1/17/96 Time 20:31 (GMT)
End Date Time (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
It appears that the pressure sensor was jarred during launch and jumped
readings from 975.4 hPa at the surface to 950.2 hPa at the first sample
after launch. This results in erroneous altitude values throughout the
sounding and erroneous ascent rate values during the first 30 seconds.
The relative altitude calculations after the second sample should be
correct. Although the surface wind speed was recorded at 10.3 m/s,
the next wind value is reported as 18.2 m/s - quite strong. The bouncing
of the balloon during the launch might account for the abnormal jarring
of the sonde.
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/18/1996 | 0533 | 01/18/1996 | 0533 |
| Subject: | Jump in pressure value upon launch |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: SGPSONDEC1
Subject: Jump in pressure value upon launch 960118:0533
Date Submitted: 1/22/96
Submitted By: Barry Lesht _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondeWRPNC1/ (alt, asc, press)
What level data: (raw,a0,a1,b1,c1 etc): all
What location was the data collected at: SGP/CF
Period of time in question
Begin Date 1/18/96 Time 05:33 (GMT)
End Date Time (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
It appears that the pressure sensor was jarred during launch and jumped
readings from 973.1 hPa at the surface to 960.7 hPa at the first sample
after launch. This results in erroneous altitude values throughout the
sounding and erroneous ascent rate values during the first 30 seconds.
The relative altitude calculations after the second sample should be
correct. The surface winds were quite strong, 16.5 m/s. The bouncing
of the balloon during the launch might account for the abnormal jarring
of the sonde.
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/13/1995 | 0531 | 12/13/1995 | 0531 |
| Subject: | Bad surface pressure sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Bad surface pressure sounding 12/13/95:0531
Date Submitted: 1/29/96
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 12/13/95 Time 05:31 (GMT)
End Date Time (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The surface pressure for this sounding was entered by the operator as 1010 hPa.
The first pressure value reported by the sonde is 971.8 hPa. Pressure at SMOS13
at 05:30 was 973.7 hPa. The reason for the discrepency between the apparent
surface pressure and that entered by the operator is unknown.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/01/1996 | 1129 | 02/01/1996 | 1129 |
| Subject: | bad pressure sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Bad pressure sounding 02/01/96:1129
Date Submitted: 2/01/96
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 02/01/96 Time 11:29 (GMT)
End Date Time (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The surface pressure for this sounding was entered by the operator as 962.6.
The first pressure value reported by the sonde is 962.4 hPa. The surface
pressure in the previous (0533) and subsequent (1429) soundings were 983.3
and 985.7 respectively. SMOS13 pressures were in the 983+ range during
this same period. It appears that the sonde pressure sensor was bad and
was used as the source of the surface pressure (this is CF standard procedure).
Both the pressure and altitude values for this sounding are likely incorrect.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/21/1996 | 1131 | 02/21/1996 | 1131 |
| Subject: | Incorrect surface pressure sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Incorrect surface pressure sounding 960221:1131
Date Submitted: 2/22/96
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 02/21/96 Time 11:31 (GMT)
End Date Time (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The surface pressure for this sounding was entered by the operator as 995.6 hPa.
The first pressure value reported by the sonde is 972.3 hPa. It appears that
the operator entered sea-level pressure reported by the WeatherMeasureII instead
of sonde surface pressure. The altitude values for this sounding are likely
incorrect.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data and remind operators of current procedures. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/21/1996 | 1430 | 02/21/1996 | 1430 |
| Subject: | Incorrect surface pressure sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Incorrect surface pressure sounding 960221:1430
Date Submitted: 2/22/96
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 02/21/96 Time 14:30 (GMT)
End Date Time (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The surface pressure for this sounding was entered by the operator as 995.6 hPa.
The first pressure value reported by the sonde is 969.7 hPa. It appears that
the operator entered sea-level pressure reported by the WeatherMeasureII instead
of sonde surface pressure. The altitude values for this sounding are likely
incorrect.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data and remind operators of current procedures. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/20/1995 | 1130 | 09/22/1995 | 1130 |
| Subject: | SGP/SONDE/C1 - incorrect factory RH calib-radiosondes |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | Ongoing investigation of differences between preciptiable water vapor
measured by the microwave radiometer and precipitable water vapor estimated
by integrating the radiosonde-measured profile of water vapor density, along
with isolated periods of anomalous behavior in the AERI/LBLRTM QME results
led to the suggestion that the calibration of some radiosondes may be suspect.
One group of radiosondes, calibrated in November 1994, seemed particularly
irregular. I met with the manufacturer on February 7 to show them my
results and discuss this issue with them. The manufacturer agreed that
the data were suggestive of a calibration problem and offered to review
their calibration records for the period in question.
The initial results of the manufacture's investigation were sent to me
on February 27. The manufacturer found that radiosondes assembled
between 10/26/94 and 11/22/94 were incorrectly calibrated. The incorrect
calibration affected only the relative humidity measurement; the nature
of the calibration error is non-linear, with the radiosondes meeting
the specified +/- 2% RH accuracy at both 20%RH (+45 degC) and 0%RH (room
temperature). The error in calibration occurs at high RH and low temperature
(approximate saturation at -30 degC) and can be as large as 10%RH with
the radiosonde reading high. The direction of this error agrees with
the observation of negative integrated residuals in the AERI ch 1 region
made by Tony Clough and the tendency toward greater than 'normal' differences
in PWV when compared to the MWR when these sondes were used.
The cause of the calibration error was the addition of new, high RH,
quality control check (-30 degC) into the manufacturing stream that
required a change in the calibration software. The new software mistakenly
loaded an incorrect parameter file that caused the calibration to be
off at high RH - this was not noticed at the time because the radiosondes
passed the regular production QC checks and the failure to agree at the
new QC value was thought to result from a problem with the new reference
standard. Troubleshooting the entire calibration system in an effort
to incorporate the new QC check was conducted along with normal production,
and took about a month to complete. The troubleshooting including adjustment
of the calibration software, at which time the correct parameter file
happened to be reloaded, and after which the radiosondes met the desired
specification at the high RH value.
According to the manufacturer, approximately 1900 radiosondes were calibrated
during the period in question. Sondes from this period were used at all
CART facilities. At least 1178 soundings involving these sondes were
included in the QME results I looked at (some QME results were discarded
because of problems with either the MWR data or the sounding data). The
distribution of these 1178 by facility is:
Facility Number of Sondes First Used Last Used
(based on QME)
CF 316 1/20/95 (11:30) 9/22/95 (11:30)
B1 143 2/21/95 (17:30) 9/29/95 ( 8:30)
B4 313 4/ 6/95 (17:30) 11/ 7/95 (17:28)
B5 153 4/14/95 (17:30) 12/14/95 (17:30)
B6 253 3/22/95 (17:30) 10/19/95 (17:30)
The sondes can be recognized by decoding the serial_number metadata word
in the sounding netCDF file. The serial number of the sondes in question
is a number (8 or 9 digit) of the form DDMMYTTPP where DD is the day of
the month (leading zero missing in the netCDF data), MM is the month +80
(e.g. 91 for November), Y is the last digit of the year (4 for 1994),
TT is the calibration tray ID, and PP is the position of the sonde in
the calibration tray. The sondes in question will therefore have serial
numbers coded between 26904TTPP and 22914TTPP. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/01/1996 | 1430 | 04/01/1996 | 1430 |
| Subject: | Bad surface pressure sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Bad surface pressure sounding 04/01/96 14:30
Date Submitted: 4/2/96
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 4/01/96 Time 14:30 (GMT)
End Date Time (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The surface pressure for this sounding was entered by the operator as 1016.1
hPa. The first pressure value reported by the sonde is 988.3 hPa. The surface
pressure at 11:29 was 987.6 and at 17:32 was 988.3. It appears that the
operator entered the sea-level pressure rather than the station pressure.
Note that this will affect the altitude calculation throughout the sounding.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/19/1995 | 0000 | 08/20/1995 | 2359 |
| 08/26/1995 | 0000 | 09/04/1995 | 2359 |
| 07/01/1996 | 1825 | 07/23/1996 | 2300 |
| Subject: | SGP/MWR/C1 - Loss of thermal stabilization |
| DataStreams: | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | Periodically during August and September 1995 all microwave radiometers at the SGP CART generated error messages in the Site Operations Log like: Time: Sat Aug 19 18:41:20 1995 MWRLOS.C1, tkxc: Value above Maximum. This indicates that the temperature of the microwave hardware (specifically, the cross-coupler or "xc") exceeded its controlled temperature (47-52 deg C) at which point it was no longer thermally stabilized and the gain was uncontrolled. During these periods which typically last about 8 hours from about local noon until about sunset the data behave anomalously and should be considered invalid. Specifically the precipitable water vapor increases and the liquid water path decreases (and becomes SIGNIFICANTLY NEGATIVE (-0.1 mm) on clear sky days). The RMS noise level in the data also increases sharply. The 'Tkxc' field appears ONLY in the a0-level data and does NOT appear in either the a1 (mwrlos) or c1 (mwr5avg) files. Therefore THESE ANOMALOUS VALUES HAVE BEEN INCLUDED IN THE 5-MINUTE AVERAGES. The microwave hardware is thermally stabilized to about +/- 0.1 deg C by resistive heating. When the internal temperature rises above the set point the thermal stabilization of the instrument gain is lost. >From an examination of the component temperature data it appears that increasing the set point temperature to about 55 deg C (328 K) would prevent a re-ocurrance of this problem at the SGP. The manufacturer, Radiometrics, concurs that raising the set point will fix this problem and will not cause other problems. I will have to carefully examine the MCTEX data to determine whether this will be a problem for the TWP. The manufacturer and I had discussed this possibility prior to building the TWP MWRs (S/N 015, 016, and 017) and those instruments have set points above 50 deg C. Note that MWR 018 has a set point near 52 deg C (like the TWP models) but it still experienced a few loss-of-stabilization events. Note that the instruments with the lowest set points had the most loss-of-stabilization events. |
| Measurements: | sgp5mwravgC1.c1:
sgpmwrlosC1.b1:
sgp1mwravgC1.c1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/12/1996 | 0531 | 04/12/1996 | 0531 |
| Subject: | Bad surface pressure sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Bad surface pressure sounding 04/12/96 05:31
Date Submitted: 4/15/96
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 4/12/96 Time 05:31 (GMT)
End Date Time (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The surface pressure for this sounding was entered by the operator as 996.1
hPa. The first pressure value reported by the sonde is 964.2 hPa. The surface
pressure at 11:30 was 972.0 and at 14:30 was 973.5. It appears that the
operator entered the sea-level pressure rather than the station pressure.
The SMOS pressure during the period is in the 960-970 range.
Note that this will affect the altitude calculation throughout the sounding.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/09/1996 | 1337 | 04/09/1996 | 1834 |
| 04/10/1996 | 0625 | 04/10/1996 | 1823 |
| 04/11/1996 | 1149 | 04/11/1996 | 1649 |
| 04/12/1996 | 0917 | 04/12/1996 | 1858 |
| 04/13/1996 | 0605 | 04/13/1996 | 1801 |
| Subject: | SGP/MWR/C1 - Radio Frequency Interference during IOP |
| DataStreams: | sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | During the specified times a strong, continuous signal was measured by the 31.4 GHz of the MWR. The signal was present in all 31.4 GHz measurements including the sky measurement, the internal reference target measurement, and the measurement of the internal noise injection source from which the instantaneous instrument gain is computed. The source of the interference has not yet been identified. Because the gain is computed using the difference of the noise injection and target measurements, and because the sky brightness temperature is computed relative to the internal target temperature, the data appear anomalous only for a period of an hour after the interference starts and ends. This is due to the low pass filter applied to the instantaneous gain. However the data should be considered invalid or at least questionable during the entire period for which the interference was present. |
| Measurements: | sgp5mwravgC1.c1:
sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/06/1996 | 0529 | 05/06/1996 | 0529 |
| Subject: | Bad surface pressure sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Bad surface pressure sounding 05/04/96 05:29
Date Submitted: 5/06/96
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 5/06/96 Time 05:29 (GMT)
End Date Time (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The surface pressure for this sounding was entered by the operator as 993.3
hPa. The first pressure value reported by the sonde is 964.0 hPa. The surface
pressure at 08:30 was 964.7 and at 11:31 was 954.3. It appears that the
operator entered the sea-level pressure rather than the station pressure.
The SMOS pressure during the period is in the 960-950 range.
Note that this will affect the altitude calculation throughout the sounding.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/29/1996 | 2031 | 05/29/1996 | 2031 |
| Subject: | bad surface pressure sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Bad surface pressure sounding 05/29/96 20:31
Date Submitted: 6/2/96
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 05/29/96 Time 20:31 (GMT)
End Date Time (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The surface pressure for this sounding was entered by the operator as 999.2
hPa. The first pressure value reported by the sonde is 978.2 hPa. The surface
pressure at 17:25 was 980.1 and at 05:30 (5/30) was 981.8. It appears that the
operator entered the sea-level pressure rather than the station pressure.
Note that this will affect the altitude calculation throughout the sounding.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/10/1996 | 1730 | 06/10/1996 | 1730 |
| Subject: | bad surface values sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Bad surface values sounding 06/10/96 17:30
Date Submitted: 6/11/96
Submitted By: Barry Lesht _X_ Instrument Mentor
David Glahn ___ EST Member
___ Science Team Member
_X_ Other _Site Ops__________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 06/10/96 Time 17:30 (GMT)
End Date Time (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The site operator inadvertently entered incorrect surface met values for
the subject sounding. Although he caught the error soon after launch
and reported it immediately, it was too late to correct. The following
table shows the incorrect (present in the file) and correct values.
Incorrect Correct
Pressure 1000.0 973.9
Temperature 35.0 30.5
Relative Humidity 27 30
The incorrect values of surface temperature and relative humidity will not
affect the other values in the sounding. The incorrect surface pressure
will, however, affect the altitude calculation throughout the sounding.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/01/1996 | 1130 | 07/01/1996 | 1130 |
| Subject: | Bad surface pressure sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Bad surface pressure sounding 06/21/96 11:30
Date Submitted: 7/1/96
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 07/01/96 Time 11:30 (GMT)
End Date Time (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The surface pressure for this sounding was entered by the operator as 996.4
hPa. The first pressure value reported by the sonde is 972.3 hPa. The surface
pressure at 05:30 was 972.3 and at 14:46 was 976.1. It appears that the
operator entered the sea-level pressure rather than the station pressure.
Note that this will affect the altitude calculation throughout the sounding.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/04/1996 | 1728 | 07/04/1996 | 1728 |
| Subject: | Bad surface pressure sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Bad surface pressure sounding 07/04/96 17:28
Date Submitted: 7/6/96
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 07/04/96 Time 17:28 (GMT)
End Date Time (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The surface pressure for this sounding was entered by the operator as 995.4
hPa. The first pressure value reported by the sonde is 970.1 hPa. The surface
pressure at 14:30 was 972.3 and at 20:27 was 971.1. It appears that the
operator entered the sea-level pressure rather than the station pressure.
Note that this will affect the altitude calculation throughout the sounding.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data.
Data Processing Notes Date |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/09/1996 | 1429 | 09/09/1996 | 1429 |
| Subject: | bad surface pressure sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Bad surface pressure sounding C1 09/09/96:14:29
Date Submitted: 9/9/96
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 09/09/96 Time 14:29 (GMT)
End Date Time (GMT)
Data should be labeled:
____ questionable ___ All data fields affected
_X__ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The surface pressure for this sounding was entered by the operator as 1001.4
hPa. The first pressure value reported by the sonde is 979.7 hPa. It appears
that the operator incorrectly entered sea-level pressure obtained from the
WeatherMeasure set rather than surface pressure obtained from the radiosonde.
Note that this will affect the altitude calculation throughout the sounding.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/09/1996 | 1731 | 09/09/1996 | 1731 |
| Subject: | bad surface pressure sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Bad surface pressure sounding C1 09/09/96:17:31
Date Submitted: 9/9/96
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 09/09/96 Time 17:31 (GMT)
End Date Time (GMT)
Data should be labeled:
____ questionable ___ All data fields affected
_X__ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The surface pressure for this sounding was entered by the operator as 1001.5
hPa. The first pressure value reported by the sonde is 978.9 hPa. It appears
that the operator incorrectly entered sea-level pressure obtained from the
WeatherMeasure set rather than surface pressure obtained from the radiosonde.
Note that this will affect the altitude calculation throughout the sounding.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data.
Data Processing Notes Date
----- End Included Message ----- |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/09/1996 | 2029 | 09/09/1996 | 2029 |
| Subject: | bad surface pressure sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Bad surface pressure sounding C1 09/09/96:20:29
Date Submitted: 9/9/96
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 09/09/96 Time 20:29 (GMT)
End Date Time (GMT)
Data should be labeled:
____ questionable ___ All data fields affected
_X__ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The surface pressure for this sounding was entered by the operator as 999.4
hPa. The first pressure value reported by the sonde is 975.4 hPa. It appears
that the operator incorrectly entered sea-level pressure obtained from the
WeatherMeasure set rather than surface pressure obtained from the radiosonde.
Note that this will affect the altitude calculation throughout the sounding.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/12/1996 | 0830 | 09/12/1996 | 0830 |
| Subject: | bad surface pressure sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Bad surface pressure sounding C1 09/12/96:0830
Date Submitted: 9/13/96
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 012/96 Time 08:30 (GMT)
End Date Time (GMT)
Data should be labeled:
____ questionable ___ All data fields affected
_X__ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The surface pressure for this sounding was entered by the operator as 987.7
hPa. The first pressure value reported by the sonde is 976.1 hPa. The
operator transposed the correct surface pressure 978.7 when entering the
data.
Note that this will affect the altitude calculation throughout the sounding.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/27/1996 | 0828 | 09/27/1996 | 0828 |
| Subject: | Bad surface pressure sounding |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Bad surface pressure sounding C1 09/26/96:0828
Date Submitted: 9/27/96
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 09/27/96 Time 08:28 (GMT)
End Date Time (GMT)
Data should be labeled:
____ questionable ___ All data fields affected
_X__ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The surface pressure for this sounding was entered by the operator as 976.1
hPa. Analysis of the raw data file suggests that the actual surface pressure
at time of launch was 967.1 hPa. It appears that the operator transposed
the correct surface pressure from 967.1 to 976.1 when entering the data.
Note that this will affect the altitude calculation throughout the sounding.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/19/1994 | 0000 | 10/28/1996 | 1618 |
| Subject: | SGP/MWR/C1 - IRT lens replaced |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | The lens of the uplooking "IR thermometer" (a 10 micrometer pyrometer)
was replaced on 28 October 1996 at 16:18 GMT. At the time the sky was
heavily overcast (0.1-0.5 mm liquid water path, IR temperature =
281-285 K) with about 4 cm integrated water vapor. A comparison was
carried out against the Atmospheric Emitted Radiance Interferometer
(AERI) both prior to and subsequent to the lens change. The statistics
of the differences (IRT-AERI) are as follows:
Mean (K) Std Dev (K) No.
Before: 0.64 0.24 122
After: 0.35 0.20 89
In addition, the downward step change in the time series plot of the
temperature difference (IRT-AERI) at the time of the lens replacement
is obvious.
This suggests, but is not conclusive evidence, that the primary cause
of the differences between the IRT and AERI reported previously
(PIF no. P960809.2) may have been the weather-worn lens. However,
as this instrument has not been calibrated since it was deployed in
December 1993, there may also be calibration drift to contend with.
Arrangements are being pursued with NREL to check the calibration of
this instrument.
It is preferable to carry out the IRT vs AERI comparison for clear sky
conditions to be certain that both instruments are observing the same
scene at the moment when they make sky measurements. However, it is
not possible at this time of the year to carry out a clear sky
comparison because the integrated water vapor is generally less than
2.0 cm which means that the IR temperature is less than 223 K, the
lower limit of the D/A converter on the IRT.
On the positive side, the AERI and the IRT are within 10 m of each
other and have similar fields of view (about 2 degrees) so their
scenes should be comparable for clear or cloudy skies. |
| Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/01/1996 | 0000 | 08/31/1996 | 2359 |
| Subject: | SGP/MWR/B1/B4/B5/B6/C1 - Thermal Stabilization Adjustment |
| DataStreams: | sgp1mwravgC1.c1, sgp5mwravgB1.c1, sgp5mwravgB4.c1, sgp5mwravgB5.c1, sgp5mwravgB6.c1, sgp5mwravgC1.c1, sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1, sgpmwrlosB5.a0, sgpmwrlosB5.a1, sgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | In order to correct a thermal stabilization problem identified earlier I adjusted the thermal set point of the microwave radiometers at the SGP upward from 48-50 deg C to 55 deg C in early August 1996 according to the schedule given below. B6 5 August 1996 C1 6 August 1996 B1 7 August 1996 B5 8 August 1996 Subsequent to making this adjustment the MWRs were put in TIP mode to check on whether the change in set point temperature affected their calibration. Because clear sky conditions were quite intermittent, it is difficult to determine whether the substantial variability in the tip data were attributable to the change in thermal set point. The instrument calibration was not altered in August. Tip data were again collected with these instruments in September prior to the beginning and at the close of the Water Vapor IOP. For example, the calibration of the instrument at the central facility (S/N 10) derived from the September data was essentially the same as that derived from calibration data acquired in February 1996. Although this would lead one to believe that altering the thermal set point did not affect the instrument calibration, it may be that some transient effect was induced. In comparing soundings launched from the central facility with the microwave radiometer there, I noticed that those sondes calibrated in June 1996 consistently reported lower integrated water vapor than the radiometer in July and September (during the IOP) but were in better agreement with the radiometer for the two weeks period immediately after the set point was adjusted. I suspect that adjusting the thermal set point may have temporarily increased the radiometer gain (kelvins/volt) thereby lowering the measured brightness temperature and the retrieved integrated water vapor. It is not clear why a temporary change in gain should occur or even whether it did. But users of the data should be aware that the data from the microwave radiometers at the SGP may be anomalous during August 1996. |
| Measurements: | sgpmwrlosB5.a1:
sgp5mwravgC1.c1:
sgp5mwravgB6.c1:
sgpmwrlosB4.a0:
sgpmwrlosB6.a0:
sgpmwrlosC1.b1:
sgpmwrlosB1.a0:
sgp1mwravgC1.c1:
sgpmwrlosC1.a1:
sgpmwrlosB4.a1:
sgpmwrlosB1.a1:
sgp5mwravgB1.c1:
sgp5mwravgB5.c1:
sgpmwrlosB5.a0:
sgp5mwravgB4.c1:
sgpmwrlosB6.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/03/1996 | 1937 | 12/12/1996 | 1920 |
| Subject: | SGP/MWR/C1 - IRT Calibration check |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | IRT was out of service for calibration check. MWR was powered down on 96/12/03 1937-1949 to remove IRT and on 96/12/12 1848-1920 to re-install IRT. The following is from the NREL Metrology Laboratory test report of 12/10/97: Temperature Nominal Value Measured Value ----------- ------------- -------------- 0 C 273.2 K 274.1 K 10 283.2 283.6 20 293.2 293.6 30 303.2 303.2 40 313.2 313.2 In the range tested, the temperature difference is within the resolution of the instrument, so the IRT was not adjusted and the calibration factor was not changed. |
| Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/10/1997 | 1730 | 01/10/1997 | 1730 |
| Subject: | Incorrect surface temperature |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Incorrect surface temperature: sounding C1 01/10/97:1730
Date Submitted: 1/11/97
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
_X_ Other - Site Ops
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 01/10/97 Time 17:30 (GMT)
End Date Time (GMT)
Data should be labeled:
____ questionable ___ All data fields affected
_X__ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The site operator noted that the surface temperature for the subject sounding
was entered incorrectly. The value entered was -3.3 degC; the correct value
should be -6.3 degC. This is a fairly benign error, only the surface values
will be affected.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/07/1997 | 1427 | 03/07/1997 | 1427 |
| Subject: | Questionable RH |
| DataStreams: | sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Questionable RH: sounding C1 03/07/97:1427
Date Submitted: 3/18/97
Submitted By: _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other - Site Ops
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnC1.A1/all
What level data: (raw,a0,a1,b1,c1 etc):
What location was the data collected at: CF
Period of time in question
Begin Date 03/07/97 Time 14:27 (GMT)
End Date Time (GMT)
Data should be labeled:
_X__ questionable _?_ All data fields affected
_X__ incorrect _X_ Only some data fields affected
_?_ wrong calibration
___ others
Discussion of Problem:
David Cook pointed out that the RH values for the subject sounding disagree
substantially with values reported at the 60m tower. Review of the sounding
data shows saturation (100%) values reported at the surface and during
most of the sounding. The site ops log shows RH values of between 68% (1400)
and 52% (1500) at the surface. Surface temperature (8.4) and pressure (983.0)
obtained from the sonde are not substantially different from the surface
observations (7.8/10.8) and (982.7/982.4) at 1400 and 1500 respectively, so
it is unlikely that an incorrect calibration tape was used for the sonde.
I think the conclusion must be that the RH sensor on this sonde was bad.
As an operational issue, this sonde should have been rejected by site ops
because the surface RH value of 100% is more than 7% different than the surface
value obtained from an independent reference instrument. I will check the
procedures that I have provided to site ops to be sure that I included this
criterion.
Other observations/measurements impacted by this problem:
None
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data. |
| Measurements: | sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/05/1997 | 1732 | 05/05/1997 | 1732 |
| Subject: | Jump in pressure value |
| DataStreams: | sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Jump in pressure value C1 sounding 970505.1732
Date Submitted: 5/06/97
Submitted By: Barry Lesht _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnc1/ (alt, asc, press)
What level data: (raw,a0,a1,b1,c1 etc): all
What location was the data collected at: SGP/CF
Period of time in question
Begin Date 5/05/97 Time 17:32 (GMT)
End Date Time (GMT)
Data should be labeled:
___ questionable _X_ All data fields affected
_X_ incorrect ___ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
The first pressure value reported by the radiosonde (t = 2 sec) is
974.9. The surface pressure value was 980.9 hPa. This difference
is somewhat greater than the expected (normal) change and may mean that
either the pressure sensor was jarred during launch or the system
mis-identified the actual launch start time. Further clarification requires
analysis of the raw data which will take some time. The altitude values
for this sounding will be incorrect. The ascent rate values during the
first 30 seconds also will be wrong. Because the system will reject
samples with out of bound ascent rates (i.e., during the first 30 seconds),
the temperature and rh values also will be incorrect (result of
interpolation). Relative height values after 30 seconds should be okay.
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data. |
| Measurements: | sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/05/1997 | 0000 | 05/05/1997 | 2359 |
| Subject: | SGP/MWR/C1 - IRT Calibration |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | Comparison of the uplooking IRT with AERI for 5 May 1997 during a time when the 9-11 micrometer sky temperature was in the range 220-228 K, according to AERI, the IRT indicated approximately 3 K higher. This is outside of the specified uncertainty in the IRT and indicates that the calibration needs to be revised. |
| Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/21/1997 | 2027 | 06/21/1997 | 2027 |
| Subject: | Incorrect surface values |
| DataStreams: | sgpsondewrpnC1.a1 |
| Description: | DQR No: Platform: sgpsondeC1
Subject: Incorrect surface values sounding 970621:2027
Date Submitted: 6/23/97
Submitted By: Barry Lesht _X_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: sgpsondewrpnc1
What level data: (raw,a0,a1,b1,c1 etc): all
What location was the data collected at: SGP/CF
Period of time in question
Begin Date 6/21/97 Time 20:27 (GMT)
End Date Time (GMT)
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
Site operations reports that incorrect surface values were entered into
the subject sounding. Instead of 972.3, 33.7, and 46 the surface pressure,
temperature, and humidity values should have been 971.8, 33.3, and 47.
The incorrect surface pressure will result in incorrect altitudes throughout
the profile and incorrect ascent rate values during the first 30 seconds.
The effects of the incorrect temperature and relative humidty values should
be negligable.
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data. |
| Measurements: | sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/22/1997 | 0228 | 06/22/1997 | 0236 |
| Subject: | Bad sounding file CF 970622:0228 |
| DataStreams: | sgpsondewrpnC1.a1 |
| Description: | It appears that there was a problem with the radiosonde that generated this short file. The pressure values are unreasonably high and the file terminated after only 484 seconds of flight. I note that the operators started a new sounding at 0252. This entire file should be disregarded or deleted. |
| Measurements: | sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/04/1997 | 0525 | 07/04/1997 | 0630 |
| Subject: | Bad pressure values CF sounding 970704:0525 |
| DataStreams: | sgpsondewrpnC1.a1 |
| Description: | The pressure values and hence altitude values are most likely incorrect in this sounding. It also appears that an incorrect surface pressure value was entered by the operator. The surface pressure value in the data (986.8) is somewhat higher than the surface pressures for the neighboring soundings and higher than recorded in the raw data collected before launch (~978 hPa). The first pressure value recorded by the sonde after launch is 884.8 hPa. Analysis of the absolutely raw data reveals that the sonde was reading about 978 hPa well before launch, then suddenly dropped to 886.8 at which it remained stable for several minutes, then began slowly decreasing as would be expected after launch. My best guess is that the sonde was somehow damaged during handling before launch resulting in erroneous pressure values. Relative pressure changes from an 'apparent' surface value of 886.8 hPa may be correct, but the absolute pressure values are not. |
| Measurements: | sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/29/1996 | 0527 | 04/29/1996 | 0527 |
| Subject: | Questionable pressure/altitude data |
| DataStreams: | sgpsondewrpnC1.a1 |
| Description: | Ric Cederwall noticed that the lowest 85 samples of this sounding have nearly constant values of temperature and relative humidity. It appears that the system may have mis-identified the launch start time in a way that resulted in the system using interpolated values of pressure even though the sonde was still on the ground. This may have been caused by a damaged pressure sensor. I will examine the absolutely raw data to try and understand this further, but I think it is reasonable to assume that the first 85 samples or so are incorrect and representative of condidtions at the surface and that the pressure sensor was damaged during this sounding. I will request the raw data from the archive today. |
| Measurements: | sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/21/1997 | 0530 | 09/21/1997 | 0530 |
| Subject: | Pressure jump at launch |
| DataStreams: | sgpsondewrpnC1.a1 |
| Description: | The difference between the first pressure value recorded by the radiosonde after launch (984.5) that the surface value entered by the operator (989.3) is somewhat larger than would normally be expected. This will result in incorrect altitude values throughout the sounding. The ascent rates during the first 30 seconds also will be incorrect. |
| Measurements: | sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/01/1998 | 0000 | 12/31/1999 | 2359 |
| Subject: | Incorrect radiosonde serial numbers |
| DataStreams: | sgpsondewrpnB1.a0, sgpsondewrpnB1.a1, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1, sgpsondewrpnB5.a0, sgpsondewrpnB5.a1, sgpsondewrpnB6.a0, sgpsondewrpnB6.a1, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | Radiosondes manufactured at Vaisala's Woburn, MA factory during the first of January 1998 have incorrect serial numbers. Instead of being numbered 8012XXXXX these sondes are numbered 7012XXXXX. Vaisala has been informed of this, has confirmed the problem, and has corrected their numbering for all subsequent sondes. 163 incorrectly numbered sondes were shipped to ARM on 1/9/98. Some have been used at the CF since 1/19/98:1430. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnB5.a1:
sgpsondewrpnB4.a0:
sgpsondewrpnB1.a0:
sgpsondewrpnB6.a0:
sgpsondewrpnB5.a0:
sgpsondewrpnB4.a1:
sgpsondewrpnB6.a1:
sgpsondewrpnC1.a1:
sgpsondewrpnB1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/19/1998 | 1130 | 01/19/1998 | 1130 |
| Subject: | Incorrect surface temperature and humidity |
| DataStreams: | sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | Incorrect values of surface temperature and relative humidity were entered by the operator. The surface temperature was entered as 17.5 degC; the first value reported by the sonde was -3.6 degC. The surface humidity was entered as 26; the first value reported by the sonde was 81%. It appears that the operator used the inside temperature/humidity rather than the sonde-reported outside temperature/humidity. Only the first few samples of the sounding will be affected. Note that the delta-check QC flag is set by this error. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/09/1997 | 1811 | 09/12/1997 | 2037 |
| Subject: | SGP/MWR/C1 - IRT offline |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | The IRT was removed from the MWR to perform a comparison/calibration check prior to the Integrated IOP. |
| Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/29/1998 | 1431 | 04/29/1998 | 1431 |
| Subject: | Incorrect surface values |
| DataStreams: | sgpsondewrpnC1.a1 |
| Description: | The surface pressure, temperature, and relative humidity are incorrect for this soundings. The values in the sounding netCDF file (975.6, 3.2, 86) are different from the surface observations in the site ops log (978.9, 9.1, and 83) and from the values in the raw radiosonde data file at the moment just before ascent (978.7, 9.5, 83). The reason for the differences are unknown, but insofar as the surface values are manually entered by the operator into both the log (where they are correct) and into the sounding file (where they are incorrect) an operator miscue is a possibility. The major effect of this problem will be incorrect absolute altitude. |
| Measurements: | sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/01/1998 | 0000 | 04/30/1998 | 2042 |
| Subject: | SGP/MWR/C1 - IRT lens replaced |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1 |
| Description: | During my recent trip to the SGP I noticed that the IRT was reading too high (about 250 K for clear sky with less than 2 cm PWV). The anti-reflective coating on the lens appeared to have deteriorated significantly. Because I observed no change in the measurements after cleaning the lens, I replaced it with the original lens which had been saved as a spare. The measured sky temperature fell to 232 K, which appeared more reasonable. The next morning I realized that I had forgotten to clean the lens after replacing it. After cleaning the IR temperature fell from 219 to 213 K with about 1.2 cm PWV. This appeared to be in agreement with Martin Platt's radiometer which measures the same passband (10 micrometers.) Upon returning to Ames, I compared the IRT with AERI for April 1998. It appears that at least as far back as 1 April the IRT data are bad. |
| Measurements: | sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/06/1998 | 0832 | 05/06/1998 | 0832 |
| Subject: | Incorrect surface pressure |
| DataStreams: | sgpsondewrpnC1.a1 |
| Description: | The operator transposed the digits of the surface pressure entering 976.3 instead of 967.3. The ops log shows 967.3 for the sonde and 968.3 for the THWAPS. Analysis of the absolutely raw sonde data shows 968.0 at the system-identified launch time. Note that because the output pressure data are smoothed, under the assumption that the surface data value is true, the first value reported by the sonde after launch 970.4 also is incorrect. The raw value corresponding to the sample after launch is 966.6. The absolute pressure values will be incorrect for the first few samples of the sounding, as will be the ascent rates for the first 30 seconds. The absolute altitude values also will be in error. |
| Measurements: | sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/09/1998 | 1431 | 05/09/1998 | 1431 |
| Subject: | Incorrect surface pressure |
| DataStreams: | sgpsondewrpnC1.a1 |
| Description: | The operator entered 960.2 for the surface pressure in both the log and the system. The first reading from the sonde is 950.9. Examination of the absolutely raw data shows that the sonde pressure before launch was 952.3. The THWAPS reading was 964.2. From the raw data it appears that either the system was not reset before this sounding or that a second sonde was started without resetting the system. The sonde pressure may be low in absolute terms or the operator may have mis-entered the actual sonde reading. In either case the absolute altitude will be wrong in this sounding and the ascent rates will be incorrect for the first 30 seconds. |
| Measurements: | sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/14/1998 | 2346 | 07/14/1998 | 2346 |
| Subject: | Bad sounding |
| DataStreams: | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | Data from this sounding look very fragmented as if only a few actual points were collected and intermediate points were intepolated. In a general sense this sounding looks 'weird' and should not be trusted. I do not yet have access to r1 so I can't look at the raw data, but I doubt that it will shed much light on the situation. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.00:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/09/1998 | 2029 | 05/09/1998 | 2029 |
| Subject: | Incorrect surface readings |
| DataStreams: | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | It appears that the operator entered an incorrect set of surface data for the subject sounding. The sounding has surface PTU as 975.6 hPa, 20.0 degC, and 93% RH - the corresponding THWAPS readings are 969.7 hPa, 19.9 degC, and 72.1 %RH. The OMIS log for the subject souding shows sonde surface values of 969.2 hPa, 17.6 degC, and 70% RH. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.00:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/07/1998 | 2329 | 05/07/1998 | 2329 |
| Subject: | Incorrect surface RH |
| DataStreams: | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | Because of what appears to be a typographical error, the operator entered 5% RH when the surface RH was 54% RH. The corresponding THWAPS reading is 50.1% RH and the OMIS log shows 54%RH. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.00:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/21/1998 | 1900 | 11/12/1998 | 2200 |
| Subject: | SGP/MWR/C1 - Erroneous internal temperature |
| DataStreams: | sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
| Description: | After the new internal temperature sensor was installed it was discovered that the scaling resistor was incorrect. (The 24.9 kohm 0.1% resistor had accidently been replaced with a 24.0 kohm resistor when the analog board was repaired by the manufacturer several years ago.) A resistor having the correct value was installed 981112. |
| Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
sgpmwrlosC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/03/1995 | 0000 | 10/12/1998 | 1900 |
| Subject: | SGP/MWR/B1/B4/B6/C1 - software change |
| DataStreams: | sgpmwrlosB1.a0, sgpmwrlosB1.a1, sgpmwrlosB4.a0, sgpmwrlosB4.a1, sgpmwrlosB6.a0, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB6.a0 |
| Description: | The MWR operating software was changed on 12 October 1998 to provide additional functionality as described below. This change affects the format of the raw and ingested data. NEW FEATURES 1. Faster sampling rate Standard line-of-sight (LOS) observations can now be acquired at 15-second intervals vs. 20-second intervals previously. (The standard LOS cycle is comprised of one sky sample per blackbody sample and gain update.) 2. More flexible sampling strategy Multiple sky observations can be acquired during a LOS cycle, up to 1024 per gain update. This permits sky samples to be acquired at intervals of 2.67 seconds for improved temporal resolution of cloud liquid water variations and better coordination with the millimeter cloud radar during IOPs. 3. Separation of zenith LOS observations from TIP data When the radiometer is in TIP mode, the zenith LOS observations are now extracted, the PWV and LWP computed and reported separately in the output file. This eliminates the periods of missing LOS data during calibration checks/updates. 4. Automatic self-calibration The software now permits the calibration to be updated at specified intervals or continuously. In the first case, LOS mode is automatically changed to TIP mode at user-specified intervals or whenever clear sky conditions occur, the tip data reduced, the calibration updated ,and the radiometer returned to LOS mode without operator intervention. In the second case, the radiometer is continuously is TIP mode until changed by the operator. 5. Graphical user display The graphical display is comprised of a status display, a message display, a temperature plot, a plot of the retrieved PWV and LWP, and (in TIP mode) a plot of the latest tip curves. Editor's Note: The SGP.C1 data were reprocessed in 2004 and enhancement #3 described above was applied to the data prior to Oct 1998. The SGP.BF data are queued for reprocessing as well. |
| Measurements: | sgpmwrtipB1.a0:
sgpmwrlosB1.a1:
sgpmwrlosB4.a0:
sgpmwrlosB6.a0:
sgpmwrlosC1.b1:
sgpmwrtipB6.a0:
sgpmwrlosB1.a0:
sgpmwrtipB4.a0:
sgpmwrlosC1.a1:
sgpmwrlosB4.a1:
sgpmwrlosB6.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/21/1993 | 1406 | 01/12/1999 | 2359 |
| Subject: | SGP/MWR/B1/B4/B5/B6/C1 - software upgrade (version 3.27) |
| DataStreams: | sgpmwrlosB1.a1, sgpmwrlosB4.a1, sgpmwrlosB5.a1, sgpmwrlosB6.a1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipB1.a0, sgpmwrtipB4.a0, sgpmwrtipB5.a0, sgpmwrtipB6.a0 |
| Description: | At 00:00 GMT on 7 January version 3.27 of the MWR operating program was installed and made operational at the SGP central facility (C1). No problems were noted over the next few days and the boundary facility MWRs (B1, B4, B5, B6) were upgraded at 20:00 GMT on 11 January. This version includes a beam width correction I developed as well as providing the capability to automatically level the elevation mirror (that is, to automatically detect and correct offsets in the elevation angle stepper motor position.) On 12 January I discovered that the '486-based MWR computers at B1, B4 and B6 were not executing the system command to move and rename the data files so that the ARM data system could retrieve them. Reducing the length of the storage arrays in the auto-leveling feature from 1000 to 250 resolved the problem. This results in the auto-leveling being based on only 4 hours of clear sky data rather than 16 hours at B5 and C1. This version of the program is 3.28. Version 3.27 (running at B5 and C1) can be installed if and when these computers are upgraded to Pentium-class machines. The improvement in the quality of the tip curves resulting from the auto-leveling has been dramatic: differences in the brightness temperatures at 3 airmasses (19.5 and 160.5 degrees) have been reduced from +/- 5 K to +/- 0.5 K. The goodness-of-fit coefficient for the tip curves has improved from about 0.995 to over 0.998. In order to take full advantage of this improvement to detect and reject cloudy tip curves, the minimum value of the goodness-of-fit coefficient for a valid tip curve has been increased from 0.995 to 0.998. Editor's Note: The SGP.C1 data were reprocessed in 2004 to produce a common DOD for all time. The 1996-1998 data reprocessing included beam width and mirror-leveling corrections, but the data prior to that range did not have these corrections applied. |
| Measurements: | sgpmwrtipB1.a0:
sgpmwrlosB5.a1:
sgpmwrtipB5.a0:
sgpmwrlosB1.a1:
sgpmwrlosC1.b1:
sgpmwrtipB6.a0:
sgpmwrtipB4.a0:
sgpmwrlosC1.a1:
sgpmwrlosB4.a1:
sgpmwrlosB6.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/27/1992 | 0000 | 05/31/2002 | 2359 |
| Subject: | SGP/SONDE - Dry bias in sonde RH |
| DataStreams: | DsgpsondeB1.00, DsgpsondeB1.a0, DsgpsondeB1.a1, DsgpsondeB4.00, DsgpsondeB4.a0, DsgpsondeB4.a1, DsgpsondeB5.00, DsgpsondeB5.a0, DsgpsondeB5.a1, DsgpsondeC1.00, DsgpsondeC1.a0, DsgpsondeC1.a1, DsgpsondenogcptucalcB1.c1, DsgpsondenogcptucalcB4.c1, DsgpsondenogcptucalcB5.c1, DsgpsondenogcptucalcC1.c1, DsgpsondenogcwrpnB1.c1, DsgpsondenogcwrpnB4.c1, DsgpsondenogcwrpnB5.c1, DsgpsondenogcwrpnC1.c1, DsgpsondeptuB1.00, DsgpsondeptuB4.00, DsgpsondeptuB5.00, DsgpsondeptuB6.00, DsgpsondeptuC1.00, DsgpsondeptucalcB1.c1, DsgpsondeptucalcB4.c1, DsgpsondeptucalcB5.c1, DsgpsondeptucalcC1.c1, sgpsondeB1.00, sgpsondeB1.a0, sgpsondeB1.a1, sgpsondeB4.00, sgpsondeB4.a0, sgpsondeB4.a1, sgpsondeB5.00, sgpsondeB5.a0, sgpsondeB5.a1, sgpsondeB6.00, sgpsondeC1.00, sgpsondeC1.a0, sgpsondeC1.a1, sgpsondeptuC1.00, sgpsondewnpnB1.a0, sgpsondewnpnB1.a1, sgpsondewnpnB4.a0, sgpsondewnpnB4.a1, sgpsondewnpnB5.a0, sgpsondewnpnB5.a1, sgpsondewnpnB6.a0, sgpsondewnpnB6.a1, sgpsondewnpnC1.a0, sgpsondewnpnC1.a1, sgpsondewnprC1.a0, sgpsondewnprC1.a1, sgpsondewrpnB1.00, sgpsondewrpnB1.a0, sgpsondewrpnB1.a1, sgpsondewrpnB4.00, sgpsondewrpnB4.a0, sgpsondewrpnB4.a1, sgpsondewrpnB5.00, sgpsondewrpnB5.a0, sgpsondewrpnB5.a1, sgpsondewrpnB6.00, sgpsondewrpnB6.a0, sgpsondewrpnB6.a1, sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1, sgpsondewrprB1.00, sgpsondewrprB1.a0, sgpsondewrprB1.a1, sgpsondewrprB4.00, sgpsondewrprB4.a0, sgpsondewrprB4.a1, sgpsondewrprB5.00, sgpsondewrprB5.a0, sgpsondewrprB5.a1, sgpsondewrprC1.00, sgpsondewrprC1.a0, sgpsondewrprC1.a1 |
| Description: | Vaisala has confirmed ARM findings of an apparent dry bias in the relative humidity measured by RS-80H radiosondes. The cause of the dry bias is thought to be contamination of the humidity sensor by volatile organic substances originating from some plastic parts of the radiosonde. The amount of contamination is a function of the time between the date of sonde manufacture and its use. All RS-80H sondes manufactured before week 34 of 1998 will show this bias. After week 34 of 1998 Vaisala changed its packaging to reduce, but not eliminate the contamination problem. Starting with RS-80 radiosonde manufactured in late June 2000 Vaisala enclosed the sensor boom in an inert plastic shield, thereby eliminating the contamination that caused the dry bias. Starting in May 2001 at the SGP, May 2002 at the TWP, and later 2002 at the NSA, ARM has moved to using RS-90 radiosondes. These sondes are not subject to the contaminatino that caused the dry bias. Vaisala is in the process of developing an algorithm that can be used to estimate the correct RH from knowledge of the sonde age. All of the ARM sounding data have sufficient metadata available to apply the correction. Additionally, ARM has funded a Science Team effort (Milosevich) to develop a 'best' correction algorithm for the RS-80 radiosonde humidity data. When completed this algorithm will allow us to reprocess the accumulated RS-80 data and produce a new data platform with what we hope will be more accurate data. |
| Measurements: | sgpsondeB4.00:
DsgpsondeB5.00:
sgpsondewrpnC1.00:
sgpsondewnpnC1.a1:
DsgpsondeptuB6.00:
DsgpsondenogcptucalcB1.c1:
sgpsondewrpnB6.a0:
DsgpsondeptuC1.00:
sgpsondewnprC1.a0:
DsgpsondenogcptucalcB5.c1:
DsgpsondeptucalcC1.c1:
sgpsondewnpnB4.a1:
sgpsondeB6.00:
sgpsondewrprB4.00:
DsgpsondeptuB1.00:
DsgpsondenogcptucalcC1.c1:
sgpsondewrpnC1.a1:
sgpsondewrpnB1.a1:
sgpsondewrprC1.00:
sgpsondewrpnB1.a0:
sgpsondewrprB5.a1:
sgpsondeB5.a1:
sgpsondewrprB5.00:
DsgpsondeC1.00:
sgpsondewrprB1.a1:
sgpsondeB1.00:
sgpsondeptuC1.00:
DsgpsondenogcptucalcB4.c1:
DsgpsondeB1.a0:
DsgpsondeC1.a1:
DsgpsondeptucalcB5.c1:
sgpsondewrprB1.00:
sgpsondewrpnC1.a0:
sgpsondewrpnB1.00:
sgpsondeB1.a0:
DsgpsondeC1.a0:
DsgpsondeB4.a1:
DsgpsondeptuB4.00:
sgpsondeB1.a1:
sgpsondewrprB5.a0:
sgpsondeC1.00:
sgpsondewnpnB1.a1:
sgpsondewrpnB6.a1:
sgpsondewrprC1.a0:
sgpsondeC1.a0:
sgpsondewrprC1.a1:
DsgpsondeptuB5.00:
sgpsondewrpnB5.a0:
sgpsondewrprB4.a1:
DsgpsondeB1.a1:
sgpsondeB5.a0:
sgpsondewnpnB6.a0:
DsgpsondeB5.a1:
DsgpsondenogcwrpnB1.c1:
sgpsondewrprB1.a0:
sgpsondewrpnB5.00:
DsgpsondeB4.a0:
DsgpsondenogcwrpnB4.c1:
DsgpsondeB5.a0:
sgpsondewnpnB4.a0:
sgpsondewnprC1.a1:
sgpsondewrpnB5.a1:
sgpsondewnpnB5.a0:
DsgpsondeB4.00:
sgpsondewrpnB6.00:
sgpsondewrprB4.a0:
sgpsondewnpnB1.a0:
sgpsondeB4.a1:
sgpsondeC1.a1:
sgpsondewrpnB4.00:
DsgpsondenogcwrpnB5.c1:
sgpsondewnpnC1.a0:
sgpsondewrpnB4.a0:
DsgpsondeB1.00:
sgpsondeB4.a0:
sgpsondewnpnB6.a1:
sgpsondewrpnB4.a1:
sgpsondewnpnB5.a1:
DsgpsondeptucalcB4.c1:
DsgpsondenogcwrpnC1.c1:
sgpsondeB5.00:
DsgpsondeptucalcB1.c1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/09/1999 | 0834 | 02/09/1999 | 1016 |
| Subject: | SGP/SONDE - Wrong cal tape |
| DataStreams: | sgpsondewndcalcC1.c1, sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | There is something wrong with this sounding, its not clear exactly what happened, however. The first values reported by the radiosonde are much different from those entered by the operator. My impression is that this is a calibration tape mixup. The raw data file shows that the sounding software was initialized twice for this sounding, the first time showing sonde 823360910, the second time showing sonde 819351814. There is no enties in the operations log that describe a problem with a sonde before launch. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.00:
sgpsondewndcalcC1.c1:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/02/1999 | 0828 | 03/02/1999 | 0828 |
| Subject: | SGP/SONDE - Pressure jump at launch |
| DataStreams: | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | The difference between the sonde-reported pressure at the surface (969.1 hPa) and the first pressure value reported after launch (963.5) is larger than expected. This may indicate that either the pressure sensor was jarred at launch, that the system failed to correctly identify the launch start time, or some other problem. The ascent rates during the first 30 seconds of the sounding will be incorrect as will the absolute altitudes during the sounding. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.00:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/22/1999 | 0230 | 03/22/1999 | 0230 |
| Subject: | Incorrect surface RH |
| DataStreams: | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | The operator entered an incorrect value (7.5%) for the surface RH for this sounding. The correct value should have been 70%. The operator noticed the error after the sounding had been completed and reported it in his log. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.00:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/10/1999 | 1130 | 05/11/1999 | 2041 |
| Subject: | SGP/SONDE - RH probably biased low in several soundings |
| DataStreams: | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | In the process of moving storage facilties, site operations uncovered some old radiosondes (vintage April 1998) that were used in several soundings starting on May 10 at 0530 and continuing at least through May 11 at 2040. Because these sondes are so old and pre-date Vaisala's repackaging they are likely subject to the sensor contamination problem that results in a dry bias in RH. The sondes in question have serial numbers 816XXXXXX. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.00:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/18/1999 | 0530 | 12/18/1999 | 0530 |
| Subject: | SGP/SONDE - Incorrect surface temperature |
| DataStreams: | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | The operator entered 20.0 degrees rather than the true temperature of 2.0 degrees. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.00:
sgpsondewrpnC1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/22/1999 | 2330 | 12/22/1999 | 2330 |
| Subject: | SGP/SONDE - Incorrect surface temperature |
| DataStreams: | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1 |
| Description: | The operator entered the surface temperature as 25 degC rather than the correct 2.5 deg C. This is the second time in a week this type of error has occurred. I have sent a separate e-mail to site ops. |
| Measurements: | sgpsondewrpnC1.a0:
sgpsondewrpnC1.00:
sgpsondewrpnC1.a1:
|