DQR ID | Subject | Data Streams Affected |
---|---|---|
D050201.1 | SGP/SONDE/C1 - Possibly bad pressure sensor or operator data entry error | sgpsondewnpnC1.b1 |
D050421.5 | SGP/SONDE/C1 - Surface pressure incorrect | sgpsondewnpnC1.b1 |
D050510.1 | SGP/SONDE/C1 - Surface pressure bad and other data noisy | sgpsondewnpnC1.b1 |
D050510.2 | SGP/SONDE/C1 - Surface pressure incorrect | sgpsondewnpnC1.b1 |
D050603.4 | SGP/SONDE/C1 - Surface pressure incorrect | sgpsondewnpnC1.b1 |
D050722.1 | SGP/MWR/C1 - REPROCESS - Revised Retrieval Coefficients | sgp1mwravgC1.c1, sgp5mwravgC1.c1, sgpmwrlosC1.a1, sgpmwrlosC1.b1, sgpmwrtipC1.a1, sgpqmemwrcolC1.c1 |
D050725.1 | SGP/SONDE/C1 - Bad RH Data | sgpsondewnpnC1.b1 |
D050811.5 | SGP/SONDE/C1 - Bad T/RH and surface P. | sgpsondewnpnC1.b1 |
D050912.2 | SGP/SONDE/C1 - Temperature/RH incorrect | sgplssondeC1.c1, sgpsondewnpnC1.b1 |
D050915.1 | SGP/MWR/C1 - Instrument noise problem | sgpmwrlosC1.b1, sgpmwrtipC1.a1, sgp1mwravgC1.c1, sgp5mwravgC1.c1 |
D051011.6 | SGP/MWR/C1 - New software version (4.15) installed | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D051027.1 | SGP/SONDE/C1 - Bad RH Data | sgpsondewnpnC1.b1 |
D051121.1 | SGP/SONDE/C1 - Sonde RH values incorrect | sgpsondewnpnC1.b1 |
D060208.2 | SGP/SONDE/C1 - Mixed use of RS92-SGP and RS92-KL radiosondes | sgpsondewnpnC1.b1 |
D060227.2 | SGP/SONDE/C1 - Soundings done as part of dual-sonde flights | sgpsondewnpnC1.b1 |
D060630.1 | SGP/SONDE/C1 - No Wind/Lat/Lon Data in Sonde Files | sgpsondewnpnC1.b1 |
D060717.2 | SGP/MWR/C1 - Spikes in ambient temperature readings | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D060928.2 | SGP/SONDE/C1 - RH values offset due to error in ground check | sgpsondewnpnC1.b1 |
D060928.3 | SGP/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry | sgpsondewnpnC1.b1 |
D061201.1 | SGP/SONDE/C1 - RH Sensor failure | sgpsondewnpnC1.b1 |
D070314.2 | SGP/MWR/C1/E14 - Freezing rain-Incorrect rain flag | sgpmwrlosC1.b1, sgpmwrlosE14.b1, sgpmwrtipC1.a1, sgpmwrtipE14.a1 |
D070322.2 | SGP/MWRHF/C1 - 90-GHz questionable calibration | sgpmwrhfC1.b1 |
D070322.3 | SGP/MWRHF/C1 - 150-Ghz channel not working | sgpmwrhfC1.b1 |
D070406.1 | SGP/MWRHF/C1 - Instrument removed | sgpmwrhfC1.00, sgpmwrhfC1.b1 |
D070802.3 | SGP/MWR/C1 - Noisy data | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D071119.1 | SGP/MWRHF/C1 - Dew formation on window | sgpmwrhfC1.b1 |
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 |
D080829.2 | SGP/SONDE/C1 - Suspect RH profile from 150-350 m above ground level | sgpsondewnpnC1.b1 |
D081013.5 | SGP/MWR/C1 - Increased noise in 31.4 GHz channel | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
D090224.3 | SGP/SONDE/C1 - Suspect RH values | sgpsondewnpnC1.b1 |
D110418.6 | SGP/MWRHF/C1 - Reprocessed: Rapid drift in 90 GHz noise diode | sgpmwrhfC1.b1 |
D111118.1 | SGP/MWRHF/C1 - Dew formation on window | sgpmwrhfC1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/19/2005 | 0531 | 01/19/2005 | 0706 |
Subject: | SGP/SONDE/C1 - Possibly bad pressure sensor or operator data entry error |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | There is a discrepency between the surface pressure and temperature data entered by the operator and that recorded by the THWAPS. Review of the raw data from the radiosonde shows that the pressure was periodically varying by as much as 12 hPa (~988 to 1000)in the time period before launch. The operator entry of 998.2 is at the high end of this range - the concurrent THWAPS reading was about 988.4 at the low end. The operator entered temperature 6.2 degC is considerably higher than the THWAPS value of 1.8. The pre-flight log entry for this sounding is missing from the OMIS database. If not for the extremely unstable pressure reading I would have assumed this was an operator error. It will take some more research to figure out what is going on. |
Measurements: | sgpsondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/11/2005 | 1749 | 04/11/2005 | 1920 |
Subject: | SGP/SONDE/C1 - Surface pressure incorrect |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | I think the operator inadvdertently entered an incorrect surface pressure value. The value entered is 988.8 hPa but the value shown in the raw data file at launch is 968.8. As a result, the absolute altitudes in this sounding will be slightly incorrect as will be the ascent rate during the first 30 seconds of flight. |
Measurements: | sgpsondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/26/2005 | 1726 | 04/26/2005 | 1910 |
Subject: | SGP/SONDE/C1 - Surface pressure bad and other data noisy |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | I was checking this sounding because the surface pressure entered by the operator was considerably higher than that recorded by the TWHAPS and SMOS. I'm not sure why, but the pressure data are very noisy while the sonde is on the ground (which accounts for the incorrect surface pressure) and the RH data aloft do not look terrible but do not look great either. |
Measurements: | sgpsondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/29/2005 | 2329 | 04/30/2005 | 0111 |
Subject: | SGP/SONDE/C1 - Surface pressure incorrect |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | I think the operator inadvdertently typed an 89 instead of a 78 when entering the surface pressure value. The value entered is 989.9 hPa but the value shown in the raw data file at launch is 978.9. As a result, the absolute altitudes in this sounding will be slightly incorrect as will be the ascent rate during the first 30 seconds of flight. |
Measurements: | sgpsondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/11/2005 | 0530 | 05/11/2005 | 0750 |
Subject: | SGP/SONDE/C1 - Surface pressure incorrect |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | I think the operator inadvdertently mistyped a digit when entering the surface pressure value. The value entered is 975.6 hPa but the value shown in the raw data file at launch is 972.6. As a result, the absolute altitudes in this sounding will be slightly incorrect as will be the ascent rate during the first 30 seconds of flight. |
Measurements: | sgpsondewnpnC1.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: | sgp5mwravgC1.c1:
sgpmwrtipC1.a1:
sgpqmemwrcolC1.c1:
sgp1mwravgC1.c1:
sgpmwrlosC1.a1:
sgpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/17/2005 | 2347 | 07/18/2005 | 0141 |
Subject: | SGP/SONDE/C1 - Bad RH Data |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | The RH values below 6 km are incorrect. The problem relates to a failure of the GC25 ground check set used before this particular sounding. The failure seems to have affected the sensor calibration with the effect that one of the two sensors was reading artificially high. Because the internal processing software uses the highest of the two sensor readings, the bad sensor value is chosen whenever it is not heated. |
Measurements: | sgpsondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/01/2005 | 1132 | 08/01/2005 | 0116 |
Subject: | SGP/SONDE/C1 - Bad T/RH and surface P. |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | Apparently multiple failures. The radiosonde temperature sensor broke on launch causing an approximate 35 degC negative offset and as a result, the RH is incorrect. Furthermore, it appears that the pressure sensor was off by approximately 4 hPa, though this would not affect the altitude calculation, the absolute pressure is wrong. |
Measurements: | sgpsondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/09/2005 | 1132 | 09/09/2005 | 1332 |
Subject: | SGP/SONDE/C1 - Temperature/RH incorrect |
DataStreams: | sgplssondeC1.c1, sgpsondewnpnC1.b1 |
Description: | The temperature throughout this sounding is too high and as a result the RH values will be incorrect as well. I'm not sure what is wrong here but the operators noted reasonable values (18.1 degC, 87%) in the log before launch. Review of the raw data, however, shows the sonde reporting temperatures nearly 20 degC higher. I suppose it is possible that the operator entered into the log the reference temperature from the GC25 ground check set rather than the temperature reported by the sonde - I can't think of any other explanation - there is no doubt that the temperature sensor on this sonde was bad. |
Measurements: | sgplssondeC1.c1:
sgpsondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/28/2005 | 1400 | 08/05/2005 | 1700 |
Subject: | SGP/MWR/C1 - Instrument noise problem |
DataStreams: | sgpmwrlosC1.b1, sgpmwrtipC1.a1, sgp1mwravgC1.c1, sgp5mwravgC1.c1 |
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: | sgp5mwravgC1.c1:
sgpmwrtipC1.a1:
sgp1mwravgC1.c1:
sgpmwrlosC1.b1:
|
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 |
---|---|---|---|
10/24/2005 | 1140 | 10/24/2005 | 1204 |
Subject: | SGP/SONDE/C1 - Bad RH Data |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | The RH values during this sounding oscillate between reasonable values and near-zero values. The oscillation is due to failure of the RH sensor heating process. |
Measurements: | sgpsondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/13/2005 | 2346 | 04/15/2005 | 1732 |
Subject: | SGP/SONDE/C1 - Sonde RH values incorrect |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | RH values for all sondes launched during this time were incorrect due to a faulty Ground Check set which damaged or conditioned the RH sensor improperly. |
Measurements: | sgpsondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/10/2006 | 0000 | 12/31/2006 | 2359 |
Subject: | SGP/SONDE/C1 - Mixed use of RS92-SGP and RS92-KL radiosondes |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | Because of a manufacturer's production problem, we will be using both RS92-SGP (GPS windfinding and RS92-KL (Loran windfinding) radiosondes at the SGP/CF starting February 10, 2006. The radiosonde type used for the each sounding may be determined by looking the metadata variable "launch_status" in the netCDF data files. |
Measurements: | sgpsondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/22/2006 | 0000 | 02/27/2006 | 0000 |
Subject: | SGP/SONDE/C1 - Soundings done as part of dual-sonde flights |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | The following soundings done during the subject time period were flown in dual-sonde mode in which the standard ARM RS92 radiosonde was attached to the same balloon with a NASA ATR (atmospheric temperature reference) radiosonde. The radiosondes were separated by a 6' styrofoam bar. To accommodate the additional weight, we used 1200g balloons rather than 350g balloons. Accordingly, we want to alert users that these soundings may reach higher altitudes than normal for ARM soundings and that the ascent rate may be somewhat higher. The following soundings are affected: Sequence Date UTC launch time 1 2/22 0530 2 2/22 1730 3 2/22 2330 <---- No data: launch failure 4 2/23 0230 5 2/23 0530 6 2/23 1730 7 2/23 2030 8 2/23 2330 9 2/24 2330 10 2/25 0215 11 2/25 0509 12 2/25 1730 13 2/25 1930 14 2/25 2300 |
Measurements: | sgpsondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/17/2006 | 0000 | 06/21/2006 | 2359 |
Subject: | SGP/SONDE/C1 - No Wind/Lat/Lon Data in Sonde Files |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | The wind finding hardware failed so that no wind or latitude/longitude data was collected on the launches for these days. |
Measurements: | sgpsondewnpnC1.b1:
|
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 |
---|---|---|---|
08/27/2006 | 2332 | 09/25/2006 | 1600 |
Subject: | SGP/SONDE/C1 - RH values offset due to error in ground check |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | Background: After installation of the latest software update , we began performing formal ground checks on RS92 radiosondes. By comparing the radiosonde readings with reference values in a controlled environment, the ground check is intended to ensure that the radiosonde sensors are in calibration before launch. The radisonde values during the ground check process are recorded automatically; the reference values are entered by the operator. If the radiosonde readings vary from the reference values, the system 'corrects' the radiosonde values. In the case of RH, the correction is applied as an offset (true RH = indicated RH + correction). Problem: Some operators misunderstood the ground-check procedure and entered the radiosonde values of RH rather than the reference value (assumed 0%RH), thus, some soundings done during this period have RH values that are different from what they would be if the ground check procedure had been done correctly. Consequence: Because the RH corrections generally are small (averaging about 0.5% RH) and the precision of the reported RH data during this time period is 1% RH, some values will not be affected at all; others will be off by about 1% RH (still within the stated accuracy of the sensor). Furthermore, because entering the radiosonde value as the reference value results in a near zero 'correction,' one may view these soundings as being done without the ground check correction. Also note that the dew point value will be suspect as well. I am attaching below a listing of the soundings that were affected during the indicated time period. Users can see the magnitude of the problem and choose whether or not to apply an offset in RH. Note that application of the offset to the processed RH data (in the netCDF file) will not have the same effect of applying the correction to the absolutely raw data (before processing), but the differences should be insignificant. Also note that the corrections for each sounding are included in the netCDF header information. These attributes are named 'humidity_correction' and 'humidity_correction_2'. The values of RH indicated by the radiosonde while it is in the ground check set are in attributes 'humidity_gc_sonde' and 'humidity_gc_sonde_2.' There is an RH reading for each of the two RH sensors used in the RS92 radiosonde. Here is the list - RH1 and RH2 are the radiosonde readings in the ground check set. Ref is the reference value entered by the operator. The correcte reference value should be 0%. To obtain an approximation to the RH value that would have been recorded if the ground check had been done properly, subtract the Ref value from the indicated RH. YYYYMMDD HHMM SerialN RH1 RH2 Ref 20060827 2332 B2624322 1.00 1.00 1.00 20060828 1731 B2634078 1.00 1.00 1.00 20060828 2332 B2624380 3.00 3.00 2.00 20060909 2331 B2615266 1.00 1.00 1.00 20060915 1759 B2914012 1.00 1.00 1.00 20060919 2350 B2825128 1.00 1.00 1.00 20060920 1800 B2825088 1.00 1.00 1.00 20060920 2346 B2815633 1.00 1.00 1.00 20060921 1728 B2834732 1.30 1.30 1.30 20060921 2330 B2825042 1.50 1.50 1.50 20060922 0527 B2825043 1.70 1.80 1.70 20060922 1128 B2825031 1.60 1.50 1.60 20060922 1729 B2834437 1.50 1.50 1.50 20060922 2330 B2825040 0.40 0.50 0.50 20060923 0529 B2834733 0.30 0.30 0.30 20060923 1128 B2825026 0.40 0.40 0.40 20060923 1729 B2825064 0.60 0.70 0.60 20060923 2330 B2825041 0.40 0.50 0.50 20060924 0529 B2825039 0.30 0.30 0.30 20060924 1729 B2825025 0.20 0.30 0.20 20060924 2329 B2825032 0.30 0.40 0.40 20060925 0529 B2824234 0.20 0.30 0.20 |
Measurements: | sgpsondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/28/2006 | 1728 | 12/31/9999 | 2359 |
Subject: | SGP/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | The output precision of the following variables was increased 20060928 alt changed from 1m to 0.1m dp changed from 0.1degC to 0.01degC pres changed from 0.1 hPa to 0.01 hPa RH changed from 1%RH to 0.01%RH tdry changed from .1degC to 0.01degC Note that the increase in precision does not necessarily imply an increase in accuracy. Users are cautioned to continue to use their best scientific judgement when using these or any other data. |
Measurements: | sgpsondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/27/2006 | 2331 | 11/28/2006 | 0056 |
Subject: | SGP/SONDE/C1 - RH Sensor failure |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | The differences between the two RH sensors on this sonde are unreasonably high (~20%). As a result the reported RH values oscillate by this amount during the times the sensors are alternately heated. After the heating stops, the reported RH comes from the sensor reading the higher value. There is no way of knowing if this is the correct value. |
Measurements: | sgpsondewnpnC1.b1:
|
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: | sgpmwrtipE14.a1:
sgpmwrtipC1.a1:
sgpmwrlosE14.b1:
sgpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/03/2006 | 1612 | 03/01/2007 | 1910 |
Subject: | SGP/MWRHF/C1 - 90-GHz questionable calibration |
DataStreams: | sgpmwrhfC1.b1 |
Description: | Between 20061103 and 20070301 one of the parameters thresholds used to select good tip curves used in the calibratio process was not optimal. This resulted in data that have a high standard deviation and a unsatisfactory agreement with model computations. After collecting enough points needed to conduct a model comparison the threshold was changed on March 1. From a limited data analysis for the month pf March it appears that the change in threshold has improved the agreement between measurements and the model. |
Measurements: | sgpmwrhfC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/23/2007 | 1800 | 04/02/2007 | 1910 |
Subject: | SGP/MWRHF/C1 - 150-Ghz channel not working |
DataStreams: | sgpmwrhfC1.b1 |
Description: | Starting on 2/23 the 150-Ghz channel is showing a temperature of 310 K. The suspected cause of the problem is a hardware failure. The instrument was removed and sent for repair on 4/2 |
Measurements: | sgpmwrhfC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/02/2007 | 1910 | 07/09/2007 | 1557 |
Subject: | SGP/MWRHF/C1 - Instrument removed |
DataStreams: | sgpmwrhfC1.00, sgpmwrhfC1.b1 |
Description: | Due to a hardware failure the instrument was removed and sent for repairs |
Measurements: | sgpmwrhfC1.00:
sgpmwrhfC1.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 |
---|---|---|---|
11/03/2006 | 1612 | 11/27/2007 | 1600 |
Subject: | SGP/MWRHF/C1 - Dew formation on window |
DataStreams: | sgpmwrhfC1.b1 |
Description: | During night time, when the humidity is very high (RH ~ 100%) data are strongly affected by dew formation on the window. This results in a smooth and large (80-150 K) increase of the brightness temperature from early night to sunrise. Data are affected mostly at night. |
Measurements: | sgpmwrhfC1.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: | sgp5mwravgC1.c1:
sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
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 |
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 |
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 |
05/08/2009 | 1535 | 05/11/2009 | 1254 |
10/30/2010 | 0400 | 11/01/2010 | 1200 |
09/24/2011 | 1900 | 09/26/2011 | 1600 |
02/03/2006 | 1903 | 02/06/2006 | 1533 |
01/21/2006 | 0708 | 01/23/2006 | 1515 |
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 |
10/09/2004 | 0745 | 10/11/2004 | 1739 |
10/16/2004 | 2250 | 10/18/2004 | 1355 |
11/13/2004 | 1849 | 11/15/2004 | 1521 |
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 |
01/04/2003 | 0703 | 01/06/2003 | 1529 |
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 |
12/21/2001 | 2153 | 12/24/2001 | 1442 |
01/30/2002 | 0845 | 02/11/2002 | 1632 |
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 |
---|---|---|---|
09/14/2006 | 1131 | 09/14/2006 | 1431 |
08/06/2006 | 1100 | 08/06/2006 | 1800 |
08/12/2006 | 1100 | 08/12/2006 | 2359 |
08/13/2006 | 2300 | 08/13/2006 | 2359 |
08/14/2006 | 1100 | 08/14/2006 | 1200 |
08/16/2006 | 1100 | 08/16/2006 | 1200 |
08/25/2006 | 1136 | 08/25/2006 | 1436 |
08/26/2006 | 1134 | 08/26/2006 | 1434 |
08/28/2006 | 0533 | 08/28/2006 | 0833 |
09/02/2006 | 1135 | 09/02/2006 | 1435 |
09/02/2006 | 1734 | 09/02/2006 | 2034 |
09/03/2006 | 0534 | 09/03/2006 | 0834 |
09/03/2006 | 1130 | 09/03/2006 | 1430 |
09/03/2006 | 1730 | 09/03/2006 | 2030 |
09/04/2006 | 1134 | 09/04/2006 | 1434 |
09/04/2006 | 1731 | 09/04/2006 | 2031 |
09/05/2006 | 1131 | 09/05/2006 | 1431 |
09/11/2006 | 0532 | 09/11/2006 | 0832 |
09/12/2006 | 1131 | 09/12/2006 | 1431 |
09/13/2006 | 1131 | 09/13/2006 | 1431 |
Subject: | SGP/SONDE/C1 - Suspect RH profile from 150-350 m above ground level |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | Several radiosondes were noticed to have a very stark dry layer between 150 m and 350 m, where the RH dropped from approximately 60-80% (which I would take as close to the ambient conditions) to less than 2%. The character of these dropouts look like instrument issues, as it only a handful of radiosondes that appear to be affected. The quicklook images from the Raman lidar does not show any very dry layers, thus supporting the hypothesis that the RH measurements from these radiosondes (at least in this small ~200 m level) are in error. I should note that the temperature profiles look normal. |
Measurements: | sgpsondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/01/2008 | 0000 | 11/30/2008 | 2300 |
Subject: | SGP/MWR/C1 - Increased noise in 31.4 GHz channel |
DataStreams: | sgpmwrlosC1.b1, sgpmwrtipC1.a1 |
Description: | The 31.4 GHz channel has been showing an increased level of noise which results in increased noise in the LWP retrievals. The instrument is tipping and all other parameters seem to be in the range. The elevate noise started in May, but it seems to have become slightly worse after summer. After November the noise level seems to have gone back to normal. |
Measurements: | sgpmwrtipC1.a1:
sgpmwrlosC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/06/2009 | 1730 | 01/06/2009 | 1730 |
Subject: | SGP/SONDE/C1 - Suspect RH values |
DataStreams: | sgpsondewnpnC1.b1 |
Description: | RH values only are suspect for the duration of this radiosonde flight, exhibiting a "sawtooth" pattern. |
Measurements: | sgpsondewnpnC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/18/2011 | 0000 | 09/20/2011 | 2359 |
Subject: | SGP/MWRHF/C1 - Reprocessed: Rapid drift in 90 GHz noise diode |
DataStreams: | sgpmwrhfC1.b1 |
Description: | The noise diode of the 90 GHz channel was showing rapid drifts that affected the accuracy of the calibration. Although the algorithm is designed to follow slow drifts in the noise diode, in this case (because the variation was fast) the computed brightness temperature was probably about 4-5 K colder than it should be. Ingest was modified and data were reprocessed and archived in September 2011 |
Measurements: | sgpmwrhfC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/11/2011 | 0300 | 11/11/2011 | 1400 |
10/23/2011 | 0500 | 10/23/2011 | 1600 |
10/24/2011 | 0800 | 10/24/2011 | 1400 |
Subject: | SGP/MWRHF/C1 - Dew formation on window |
DataStreams: | sgpmwrhfC1.b1 |
Description: | During the indicated time there was moisture or dew on the radiometer window and the brightness temperatures are too high. The presence of dew can be recognized by a smooth increase in the brightness temperature followed by a smooth decrease over several hours. |
Measurements: | sgpmwrhfC1.b1:
|