| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| 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 |
| 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:
|