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 |
D000625.1 | SGP/SONDE/C1 - Operator used wrong calibration tape | sgpsondeC1.00, sgpsondeC1.a0, sgpsondeC1.a1, sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1, sgpsondewndcalcC1.c1 |
D000801.2 | SGP/SONDE/C1 - Incorrect absolute pressure | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1, sgpsondewndcalcC1.c1 |
D001107.1 | SGP/SONDE/C1 - Incorrect surface temperature | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, 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 |
D980506.1 | Incorrect surface values | sgpsondewrpnC1.a1 |
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 |
D990124.2 | SGP/SONDE - Dry bias in sonde RH | 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, DsgpsondeB1.00, DsgpsondeB1.a0, DsgpsondeB1.a1, DsgpsondeB4.00, DsgpsondeB4.a0, DsgpsondeB4.a1, DsgpsondeB5.00, DsgpsondeB5.a0, DsgpsondeB5.a1, DsgpsondeC1.00, DsgpsondeC1.a0, DsgpsondeC1.a1, sgpsondeptuC1.00, DsgpsondeptuB1.00, DsgpsondeptuB4.00, DsgpsondeptuB5.00, DsgpsondeptuB6.00, DsgpsondeptuC1.00, 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, DsgpsondeptucalcB1.c1, DsgpsondeptucalcB4.c1, DsgpsondeptucalcB5.c1, DsgpsondeptucalcC1.c1, DsgpsondenogcwrpnB1.c1, DsgpsondenogcwrpnB4.c1, DsgpsondenogcwrpnB5.c1, DsgpsondenogcwrpnC1.c1, DsgpsondenogcptucalcB1.c1, DsgpsondenogcptucalcB4.c1, DsgpsondenogcptucalcB5.c1, DsgpsondenogcptucalcC1.c1 |
D990210.1 | SGP/SONDE - Wrong cal tape | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1, sgpsondewndcalcC1.c1 |
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 |
---|---|---|---|
06/23/2000 | 2330 | 06/24/2000 | 0100 |
Subject: | SGP/SONDE/C1 - Operator used wrong calibration tape |
DataStreams: | sgpsondeC1.00, sgpsondeC1.a0, sgpsondeC1.a1, sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1, sgpsondewndcalcC1.c1 |
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: | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1, sgpsondewndcalcC1.c1 |
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 |
---|---|---|---|
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 |
---|---|---|---|
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 |
---|---|---|---|
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 |
---|---|---|---|
05/27/1992 | 0000 | 05/31/2002 | 2359 |
Subject: | SGP/SONDE - Dry bias in sonde RH |
DataStreams: | 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, DsgpsondeB1.00, DsgpsondeB1.a0, DsgpsondeB1.a1, DsgpsondeB4.00, DsgpsondeB4.a0, DsgpsondeB4.a1, DsgpsondeB5.00, DsgpsondeB5.a0, DsgpsondeB5.a1, DsgpsondeC1.00, DsgpsondeC1.a0, DsgpsondeC1.a1, sgpsondeptuC1.00, DsgpsondeptuB1.00, DsgpsondeptuB4.00, DsgpsondeptuB5.00, DsgpsondeptuB6.00, DsgpsondeptuC1.00, 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, DsgpsondeptucalcB1.c1, DsgpsondeptucalcB4.c1, DsgpsondeptucalcB5.c1, DsgpsondeptucalcC1.c1, DsgpsondenogcwrpnB1.c1, DsgpsondenogcwrpnB4.c1, DsgpsondenogcwrpnB5.c1, DsgpsondenogcwrpnC1.c1, DsgpsondenogcptucalcB1.c1, DsgpsondenogcptucalcB4.c1, DsgpsondenogcptucalcB5.c1, DsgpsondenogcptucalcC1.c1 |
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: | sgpsondewrpnC1.00, sgpsondewrpnC1.a0, sgpsondewrpnC1.a1, sgpsondewndcalcC1.c1 |
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:
|