DQR ID | Subject | Data Streams Affected |
---|---|---|
D020927.1 | SGP/ARSCL/C1 - ARSCL Cloud Bases and Low-level reflectivities | sgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1 |
D970409.3 | Reprocess: Jump in pressure value | sgpsondewrpnB6.a1 |
D970410.5 | Reprocess: Jump in pressure value | sgpsondewrpnB5.a1 |
D970921.3 | Pressure jump at launch | sgpsondewrpnB4.a1 |
D970923.1 | Pressure jump at launch | sgpsondewrpnB5.a1 |
D970930.1 | Pressure jump at launch | sgpsondewrpnB1.a1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/01/1996 | 0000 | 02/04/2000 | 2359 |
Subject: | SGP/ARSCL/C1 - ARSCL Cloud Bases and Low-level reflectivities |
DataStreams: | sgparscl1clothC1.c1, sgparsclbnd1clothC1.c1, sgparsclcbh1clothC1.c1 |
Description: | Prior to February 4, 2000, the ARSCL data set incorporated data from the Beaufort Laser Ceilometer as one of its inputs. Because of the BLC's high spatial resolution, this data was often chosen by ARSCL as the "CloudBaseBestEstimate" for boundary layer clouds. It was subsequently determined that the BLC cloud base was biased, with the BLC reporting cloud base heights that are 122 meters too high. The bias error will be corrected when the entire ARSCL data set is reprocessed as part of release_4. (The release version number is included the the netCDF global comments). This reprocessing will also include a small correction the the MMCR near-field reflectivities. This correction is less than 1 dB except for hydrometers within 200 meters of the surface. Thanks to Roger Marchand for helping bracket this problem. |
Measurements: | sgparsclbnd1clothC1.c1:
sgparscl1clothC1.c1:
sgparsclcbh1clothC1.c1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/04/1997 | 1733 | 04/04/1997 | 1733 |
Subject: | Reprocess: Jump in pressure value |
DataStreams: | sgpsondewrpnB6.a1 |
Description: | DQR No: Platform: sgpsondeB6 Subject: Jump in pressure value B6 sounding 970404.1733 Date Submitted: 4/9/97 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: sgpsondewrpnb6/ (alt, asc, press) What level data: (raw,a0,a1,b1,c1 etc): all What location was the data collected at: SGP/BF6 Period of time in question Begin Date 4/04/97 Time 17:33 (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 879.2. The surface pressure value was 962.1 hPa. 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. Data Processing Notes Date |
Measurements: | sgpsondewrpnB6.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/05/1997 | 2030 | 04/05/1997 | 2030 |
Subject: | Reprocess: Jump in pressure value |
DataStreams: | sgpsondewrpnB5.a1 |
Description: | DQR No: Platform: sgpsondeB5 Subject: Jump in pressure value B5 sounding 970405.2030 Date Submitted: 4/10/97 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: sgpsondewrpnb5/ (alt, asc, press) What level data: (raw,a0,a1,b1,c1 etc): all What location was the data collected at: SGP/BF5 Period of time in question Begin Date 4/5/97 Time 20:30 (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 967.3. The surface pressure value was 973.5 hPa. This difference is slightly 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. Data Processing Notes Date |
Measurements: | sgpsondewrpnB5.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/17/1997 | 2030 | 09/17/1997 | 2030 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB4.a1 |
Description: | The difference between the first pressure reported by the sonde after launch (930.0) and that reported at the surface (935.7) is larger than would be expected. The altitude values for this sounding will be incorrect, as will be the ascent rates for the first 30 seconds. Some of the P, T, and RH samples (most likely those nearest the ground) will be interpolated values. |
Measurements: | sgpsondewrpnB4.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/21/1997 | 1430 | 09/21/1997 | 1430 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB5.a1 |
Description: | The difference between the first pressure value reported by the sonde after launch (992.7) and the surface value entered by the operator (997.5) is somewhat greater than would normally be expected. This may indicate jarring of the pressure sensor at launch or misidentification of the start time by the system. The altitude values in the file will be incorrect as well be the ascent rate values during the first 30 seconds of the sounding. |
Measurements: | sgpsondewrpnB5.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/27/1997 | 0530 | 09/27/1997 | 0530 |
Subject: | Pressure jump at launch |
DataStreams: | sgpsondewrpnB1.a1 |
Description: | The difference between first pressure value reported by the radiosonde after launch (954.4) and the surface value entered by the operator (961.7) is greater than expected , indicating that either ths sonde was jarred on launch or that the system mis-identified start time. |
Measurements: | sgpsondewrpnB1.a1:
|