DQR ID | Subject | Data Streams Affected |
---|---|---|
D031216.1 | NSA/GNDRAD/C1 - IRT cable failure | nsagndrad60sC1.b1 |
D031216.2 | NSA/GNDRAD/C1 - IRT returned to vendor | nsagndrad60sC1.b1 |
D040919.1 | NSA/GNDRAD/C1 - IRT power failure | nsagndrad60sC1.b1 |
D041013.3 | NSA/GNDRAD/C1 - Frosting/Condensation | nsagndradC1.00, nsagndrad20sC1.a1, nsagndrad60sC1.b1 |
D060630.39 | NSA/GNDRAD/C1 - Reprocess: Longwave Calibration error | nsagndrad60sC1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/27/2003 | 1400 | 09/11/2003 | 1906 |
Subject: | NSA/GNDRAD/C1 - IRT cable failure |
DataStreams: | nsagndrad60sC1.b1 |
Description: | The IRT signal became very noisy and the problem was traced to the cable (after the instrument was returned to the vendor for diagnosis). The problem started occurring when ice surrounding the cable began to melt. The cable was repaired and the instrument reinstalled. |
Measurements: | nsagndrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/11/2003 | 1906 | 10/15/2003 | 0015 |
Subject: | NSA/GNDRAD/C1 - IRT returned to vendor |
DataStreams: | nsagndrad60sC1.b1 |
Description: | The IRT was returned to the vendor for diagnosis. It was found to be operating as expected and the signal noise problem was traced to the cable. The cable was repaired and the instrument reinstalled. |
Measurements: | nsagndrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/15/2004 | 0000 | 09/22/2004 | 0552 |
Subject: | NSA/GNDRAD/C1 - IRT power failure |
DataStreams: | nsagndrad60sC1.b1 |
Description: | After performing corrective maintenance which involved turning off power to the GNDRAD instruments and data logger, power to the IRT was not restored. The problem was corrected by replacing the data logger. |
Measurements: | nsagndrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/09/2004 | 0000 | 10/15/2004 | 2359 |
Subject: | NSA/GNDRAD/C1 - Frosting/Condensation |
DataStreams: | nsagndradC1.00, nsagndrad20sC1.a1, nsagndrad60sC1.b1 |
Description: | The GNDRAD PIR and IRT comparison was showing the IRT 2-4 W/m^2 greater than the PIR. Suspected snow or frost on the instrument(s). Corrective maintenance performed 10/15/04 at 21:30 UT. Optics of both instruments were cleaned. Upwelling longwave measurement agreement restored (+/- 5 W/^2). Although the relative performance (agreement) of the two instruments improved after corrective maintenance (+/- 2 W/m^2), no correction is suggested because the agreement remains with the estimated measurement uncertainty of +/- 4 W/m^2 (IRT) and +/-10 W/m^2 (Inverted PIR) |
Measurements: | nsagndradC1.00:
nsagndrad60sC1.b1:
nsagndrad20sC1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/04/2004 | 1600 | 12/21/2005 | 1855 |
Subject: | NSA/GNDRAD/C1 - Reprocess: Longwave Calibration error |
DataStreams: | nsagndrad60sC1.b1 |
Description: | Modified pyrgeometer calibration procedures were implemented beginning in December 2003. 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 are being reprocessing to remove the calibration bias. Note, this also affected standard deviation, maximum and minimum data fields. |
Measurements: | nsagndrad60sC1.b1:
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