| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D040322.1 | SGP/SIRS/C1 - Discrepancy between measured and derived downwelling shortwave hemispheric | sgpsirs20sC1.a0, sgpsirsC1.b1 |
| D040608.2 | SGP/BRS/C1 - NIP sensor failure | sgpbrs20sC1.a0, sgpbrsC1.00, sgpbrsC1.b1 |
| D040907.1 | SGP/SIRS/C1/E13 - Incorrect calibration coefficients | sgpsirs20sC1.a0, sgpsirs20sE13.a0, sgpsirsC1.00, sgpsirsC1.b1, sgpsirsE13.00, sgpsirsE13.b1 |
| D050106.4 | SGP/SIRS/C1 - Reprocess: UIR/DIR Incorrect calibration coefficients | sgpsirsC1.00, sgpsirsC1.b1 |
| D050206.1 | SGP/BRS/C1 - Monthly Summary | sgpbrsC1.b1 |
| D050206.2 | SGP/SIRS/C1 - Monthly Summary | sgpsirsC1.b1 |
| D050206.3 | SGP/SIRS/E13 - Monthly Report | sgpsirsE13.b1 |
| 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 |
| D060630.21 | SGP/SIRS/E13 - Reprocessed: Longwave Calibration error | sgpsirsE13.b1 |
| D060630.7 | SGP/BRS/C1 - Reprocessed: Longwave Calibration error | sgpbrsC1.b1 |
| D060630.8 | SGP/SIRS/C1 - Reprocessed: Longwave Calibration error | sgpsirsC1.b1 |
| D061102.1 | SGP/BRS/C1 - Reprocess: Calibration error in Downwelling Longwave measurement | sgpbrs20sC1.a0, sgpbrsC1.b1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/18/2004 | 1500 | 06/10/2004 | 2000 |
| Subject: | SGP/SIRS/C1 - Discrepancy between measured and derived downwelling shortwave hemispheric |
| DataStreams: | sgpsirs20sC1.a0, sgpsirsC1.b1 |
| Description: | Measured values of downwelling hemispheric shortwave radiation were up to 40 W/m^2 higher than derived values during the afternoon hours. Analysis reveals that this is likely an artifact of the cosine response of the particular installed PSP coupled with typical uncertainties of this set of installed radiometers. That is, this particular instrument cluster seems to be producing cumulative errors on the high side of accepted values. The PSP contains the most uncertainty in measurement at this station. Users should use a derived value for the downwelling shortwave hemispheric irradiance (DS). Where DS = diffuse component + direct normal * cos(SZA) component described in the SIRS handbook Sec 7.2 available at: http://www.arm.gov/publications/tech_reports/handbooks/sirs_handbook.pdf |
| Measurements: | sgpsirsC1.b1:
sgpsirs20sC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/02/2004 | 1734 | 06/15/2004 | 2010 |
| Subject: | SGP/BRS/C1 - NIP sensor failure |
| DataStreams: | sgpbrs20sC1.a0, sgpbrsC1.00, sgpbrsC1.b1 |
| Description: | Normal incidence values of downwelling shortwave radiation were
reported as -9999 (missing). The NIP instrument was damaged by
lightning in the area near the time of failure. |
| Measurements: | sgpbrs20sC1.a0:
sgpbrsC1.00:
sgpbrsC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/27/2004 | 1830 | 09/07/2004 | 2130 |
| Subject: | SGP/SIRS/C1/E13 - Incorrect calibration coefficients |
| DataStreams: | sgpsirs20sC1.a0, sgpsirs20sE13.a0, sgpsirsC1.00, sgpsirsC1.b1, sgpsirsE13.00, sgpsirsE13.b1 |
| Description: | After the DIR changeout on 8/27, the DLH measurements at the central facility vary significantly between pyrgeometers by as much as 65 Wm^(-2). It was discovered that the two downwelling pyrgeometers destined for C1 and E13 may have been swapped during installation. The instrument mentor is unsure of applied calibration coefficients during this DQR's time period. Backing out new downwelling longwave irradiances would be difficult in this case. Fortunately, the problem period is less than a fortnight. |
| Measurements: | sgpsirsE13.b1:
sgpsirsC1.b1:
sgpsirsC1.00:
sgpsirs20sE13.a0:
sgpsirs20sC1.a0:
sgpsirsE13.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/27/2004 | 1429 | 01/07/2005 | 1623 |
| Subject: | SGP/SIRS/C1 - Reprocess: UIR/DIR Incorrect calibration coefficients |
| DataStreams: | sgpsirsC1.00, sgpsirsC1.b1 |
| Description: | It appears the datalogger program at SIRS/C1 was automatically updated, unbeknownst to anyone, on 9/27/20041423GMT with an older program with incorrect UIR and DIR calibration coefficients. The correct and incorrect cal coeffs for the UIR and DIR pyrgeometers during this DQR period were: incorrectUIR correctUIR K0 -12.84 -13.00 K1 .2250 0.2573 K2 1.024 1.024 K3 -1.9280 -1.8050 incorrectDIR correctDIR K0 -13.15 -26.89 K1 0.2374 0.2967 K2 1.0260 1.0560 K3 -2.478 -3.3080 |
| Measurements: | sgpsirsC1.b1:
sgpsirsC1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/01/2004 | 0000 | 12/31/2004 | 0000 |
| Subject: | SGP/BRS/C1 - Monthly Summary |
| DataStreams: | sgpbrsC1.b1 |
| Description: | Data quality this site-month is poor. This is due largely to the missing Upwelling Shortwave and Upwelling Longwave the entire month. This problem has been ongoing for several months now. DQPR # 124 asserted that the Global PSP was recording inaccurate readings. Thus, the Global PSP was changed out on the 17th by site ops. Prior to the 17th, the Global PSP was falling below nighttime empirical limits on most nights and there were severe 3 component failures during the day. The change out of the PSP mitigated the severity of the 3 component failures and eliminated the nighttime empirical limits failures. There were still substantial 3 component flags after the 17th. |
| Measurements: | sgpbrsC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/01/2004 | 0000 | 01/01/2005 | 0000 |
| Subject: | SGP/SIRS/C1 - Monthly Summary |
| DataStreams: | sgpsirsC1.b1 |
| Description: | dominant problem here is the daytime 3 component problem. Direct and Diffuse are always too high and Global is too low. The problem occurs around the time that the testing regime switches from twilight to daytime testing regimes or from daytime to twilight. The flags occur in significant numbers on the 1st - 5th, 8th - 20th, 24th - 28th, 30th, and 31st. The failures vary in magnitude and duration. The worst flags for a particular day is typically high level yellow, with respect to this problem. Global goes below daytime empirical limits on both the 5th and 6th for substantial periods of time. Diffuse also goes below daytime empirical limits on the 6th in the evening. Upwelling Longwave is below empirical limits on the 24th. This may not be a problem, as many sites exhibited the same problem on the same night. Exceptionally cold temperatures may be the cause. Direct also exceeds its daytime empirical limit on the 1st, 4th, 10th, 13th, 14th, and 20th. This occurs at the changeover from medium to high air mass and does not last for longer than 30 minutes. |
| Measurements: | sgpsirsC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/01/2004 | 0000 | 01/01/2005 | 0000 |
| Subject: | SGP/SIRS/E13 - Monthly Report |
| DataStreams: | sgpsirsE13.b1 |
| Description: | :Data quality this site-month is good. The offset for the Global PSP is about -7 W/m^2. The dominant problem here is the daytime 3 component problem. Direct and Diffuse are always too high and Global is too low. The problem occurs around the time that the testing regime switches from twilight to daytime testing regimes or from daytime to twilight. The flags occur in significant numbers on the 1st - 5th, 7th - 20th, 24th - 28th, 30th, and 31st. The failures vary in magnitude and duration. The worst flags for a particular respect to this problem. Global goes below daytime empirical limits on both the 5th and 6th for substantial periods of time. Diffuse also goes below daytime empirical limits on the 6th in the afternoon. Upwelling Longwave is below empirical limits on the 24th. This may not be a problem, as many sites exhibited the same problem on the same night. Exceptionally cold temperatures may be the cause. |
| Measurements: | sgpsirsE13.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: | sgpbrs20sC1.a0:
sgpbrsC1.00:
sgpbrsC1.b1:
|
| 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: | sgpbrs20sC1.a0:
sgpbrsC1.00:
sgpbrsC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/11/2003 | 1935 | 02/16/2006 | 1905 |
| Subject: | SGP/SIRS/E13 - Reprocessed: Longwave Calibration error |
| DataStreams: | sgpsirsE13.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 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 October 2006. |
| Measurements: | sgpsirsE13.b1:
|
| 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:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/11/2003 | 1950 | 02/16/2006 | 1901 |
| Subject: | SGP/SIRS/C1 - Reprocessed: Longwave Calibration error |
| DataStreams: | sgpsirsC1.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 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 October 2006. |
| Measurements: | sgpsirsC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/11/2003 | 1920 | 06/14/2004 | 2359 |
| Subject: | SGP/BRS/C1 - Reprocess: Calibration error in Downwelling Longwave measurement |
| DataStreams: | sgpbrs20sC1.a0, sgpbrsC1.b1 |
| Description: | On 20031211 the Downwelling LW pyrgeometer was replaced but the calibrations were not updated. Calibrations have been corrected in data beginning 20040615. |
| Measurements: | sgpbrs20sC1.a0:
sgpbrsC1.b1:
|