DQR ID | Subject | Data Streams Affected |
---|---|---|
D050225.2 | SGP/BRS/C1 - Reprocess: Incorrect Calibration Coefficients | sgpbrs20sC1.a0, sgpbrsC1.00, sgpbrsC1.b1 |
D050322.1 | SGP/BRS/C1 - low downwelling shortwave readings | sgpbrs20sC1.a0, sgpbrsC1.00, sgpbrsC1.b1 |
D060630.7 | SGP/BRS/C1 - Reprocessed: Longwave Calibration error | sgpbrsC1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/05/2004 | 1500 | 12/03/2004 | 1700 |
Subject: | SGP/BRS/C1 - Reprocess: Incorrect Calibration Coefficients |
DataStreams: | sgpbrs20sC1.a0, sgpbrsC1.00, sgpbrsC1.b1 |
Description: | Lightening strike on or near 6/2/2004 took the BRS NIP(31747E6) out of service, on or near 6/15 the NIP was replaced and the datalogger program was changed to reflect the new NIP(31343E6). On 8/5/2004 the DIR (Downwelling longwave) instrument was changed out and a new program was loaded to reflect a new DIR. The new program contained the original installed shortwave instrument calibration coefficients including NIP 31747E6. Thus from 8/5 to when the shortwave instruments were changed out on 12/3 the wrong s/n and calibration factor (i.e. 31747E6) was applied to the actual NIP(31343E6)installed at BRS C1. |
Measurements: | sgpbrsC1.b1:
sgpbrs20sC1.a0:
sgpbrsC1.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/18/2003 | 0000 | 12/17/2004 | 2030 |
Subject: | SGP/BRS/C1 - low downwelling shortwave readings |
DataStreams: | sgpbrs20sC1.a0, sgpbrsC1.00, sgpbrsC1.b1 |
Description: | Downwelling shortwave (DS) values frequently drop below -10 W/m^2 at night, and are consistently 20-40 W/m^2 less than the calculated downwelling shortwave during the day in clear-sky conditions. Corrective maintenance on 12/17/2004 corrected this offset. It is not clear which CM action corrected the problem since the DS instrument cable was grounded to a new location and the DS ventilator fan was found in poor condition and was replaced. Either of these issues could have led to the problem observed in this instrument. |
Measurements: | sgpbrsC1.b1:
sgpbrs20sC1.a0:
sgpbrsC1.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/11/2003 | 1935 | 02/16/2006 | 1903 |
Subject: | SGP/BRS/C1 - Reprocessed: Longwave Calibration error |
DataStreams: | sgpbrsC1.b1 |
Description: | Modified pyrgeometer calibration procedures were implemented beginning in June 2004. These modified procedures introduced a calibration bias in the longwave data. The previous procedures were re-implemented at all sites between December 2005 and February 2006 to restore proper calibrations. The data collected while the incorrect procedures were in place have been reprocessed to remove the calibration bias. The reprocessed 60 second averaged data are based on 3 instantaneous 20 second data records rather than on 60 1 second instantaneous data records. Still, these data are considered far superior to the originally processed data. The reprocessed data were archived in November 2006. |
Measurements: | sgpbrsC1.b1:
|