| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D030715.1 | SGP/SIRS/E3 - Degraded upwelling longwave data | sgpsirsE3.00, sgpsirsE3.b1, sgpsirs20sE3.a0 |
| D031208.6 | SGP/SIRS/E4 - Shadowband Misalignment | sgpsirsE4.00, sgpsirsE4.b1, sgpsirs20sE4.a0 |
| D040205.1 | SGP/SIRS/E1/E2/E3/E5/E8 - Snow on Radiometers | sgpsirsE1.00, sgpsirsE1.b1, sgpsirsE2.00, sgpsirsE2.b1, sgpsirsE3.00, sgpsirsE3.b1, sgpsirsE5.00, sgpsirsE5.b1, sgpsirsE8.00, sgpsirsE8.b1, sgpsirs20sE1.a0, sgpsirs20sE2.a0, sgpsirs20sE3.a0, sgpsirs20sE5.a0, sgpsirs20sE8.a0 |
| D050726.1 | SGP/SIRS/E4 - Dirt on Dome | sgpsirsE4.00, sgpsirsE4.b1, sgpsirs20sE4.a0 |
| D060630.11 | SGP/SIRS/E3 - Reprocessed: Longwave Calibration error | sgpsirsE3.b1 |
| D060630.12 | SGP/SIRS/E4 - Reprocessed: Longwave Calibration error | sgpsirsE4.b1 |
| D060703.1 | SGP/SIRS/E3 - Reprocess: Wrong Calibration Coefficients | sgpsirsE3.b1, sgpsirs20sE3.a0 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/05/2003 | 0400 | 07/30/2003 | 1600 |
| Subject: | SGP/SIRS/E3 - Degraded upwelling longwave data |
| DataStreams: | sgpsirsE3.00, sgpsirsE3.b1, sgpsirs20sE3.a0 |
| Description: | Upwelling longwave values had been showing spikes in the late evening beginning around 7/5. On 7/16/03 technicians found a rodent nest and cables chewed at pivot point of upwelling instrument tower. Only the upwelling longwave (UIR) instrument case temperature was affected but this degrades all of the UIR longwave irradiance measurement. Both UIR and US cables replaced on 7/30/03 1600 GMT which fixed the problem. |
| Measurements: | sgpsirsE3.00:
sgpsirs20sE3.a0:
sgpsirsE3.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/04/2003 | 1700 | 12/08/2003 | 1200 |
| Subject: | SGP/SIRS/E4 - Shadowband Misalignment |
| DataStreams: | sgpsirsE4.00, sgpsirsE4.b1, sgpsirs20sE4.a0 |
| Description: | The solar tracker failed on 12/4, resulting in bad direct and
diffuse measurements. The tracker started working again on 12/8
without Ops intervention. Technician maintenance checks on 12/3
and 12/17 reported correct tracker operation. |
| Measurements: | sgpsirsE4.00:
sgpsirsE4.b1:
sgpsirs20sE4.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/02/2004 | 1200 | 02/02/2004 | 2000 |
| Subject: | SGP/SIRS/E1/E2/E3/E5/E8 - Snow on Radiometers |
| DataStreams: | sgpsirsE1.00, sgpsirsE1.b1, sgpsirsE2.00, sgpsirsE2.b1, sgpsirsE3.00, sgpsirsE3.b1, sgpsirsE5.00, sgpsirsE5.b1, sgpsirsE8.00, sgpsirsE8.b1, sgpsirs20sE1.a0, sgpsirs20sE2.a0, sgpsirs20sE3.a0, sgpsirs20sE5.a0, sgpsirs20sE8.a0 |
| Description: | A large discrepancy between the measured values of downwelling hemispheric shortwave radiation and the derived values occurred on 2/02 at the listed sites. The difference is on the order of 200 Wm^(-2) at E2 and to a lesser extent at the other affected stations. This problem most likely resulted from a previous day or night snow/ice accumulation on the Direct(NIP), Downwelling Sortwave(PSP) and/or Downwelling Diffuse(8-48) instruments. During the morning hours of 02/02, Approx 1300-2000GMT, snow/ice was covering one or more of these three instruments resulting in faulty readings and incorrect derived downwelling shortwave values as well. Instrument readings indicate the problem resolved itself later in the day through normal meltoff. |
| Measurements: | sgpsirs20sE5.a0:
sgpsirsE2.b1:
sgpsirsE1.00:
sgpsirsE2.00:
sgpsirs20sE3.a0:
sgpsirsE3.b1:
sgpsirs20sE1.a0:
sgpsirsE8.00:
sgpsirsE3.00:
sgpsirsE5.b1:
sgpsirsE1.b1:
sgpsirsE5.00:
sgpsirs20sE2.a0:
sgpsirs20sE8.a0:
sgpsirsE8.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/16/2005 | 1412 | 07/27/2005 | 1600 |
| Subject: | SGP/SIRS/E4 - Dirt on Dome |
| DataStreams: | sgpsirsE4.00, sgpsirsE4.b1, sgpsirs20sE4.a0 |
| Description: | The downwelling shortwave hemispheric radiation data are suspect. The PSP dome appears to have been very dirty, especially during times when the sun angles were low. |
| Measurements: | sgpsirsE4.00:
sgpsirsE4.b1:
sgpsirs20sE4.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/10/2004 | 1715 | 02/08/2006 | 1730 |
| Subject: | SGP/SIRS/E3 - Reprocessed: Longwave Calibration error |
| DataStreams: | sgpsirsE3.b1 |
| Description: | Modified pyrgeometer calibration procedures were implemented beginning in March 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 August 2006. |
| Measurements: | sgpsirsE3.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/10/2004 | 1720 | 02/22/2006 | 1615 |
| Subject: | SGP/SIRS/E4 - Reprocessed: Longwave Calibration error |
| DataStreams: | sgpsirsE4.b1 |
| Description: | Modified pyrgeometer calibration procedures were implemented beginning in March 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 October 2006. |
| Measurements: | sgpsirsE4.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/14/2006 | 1612 | 07/12/2006 | 1830 |
| Subject: | SGP/SIRS/E3 - Reprocess: Wrong Calibration Coefficients |
| DataStreams: | sgpsirsE3.b1, sgpsirs20sE3.a0 |
| Description: | No data were collected from 6/7/2006 0000 to 6/14/2006 1612 due to hardware problems. When data resumed on 6/14, ALL calibration coefficients and serial numbers were for different instruments possibly due to incorrect program loaded on storage module. Correct program reloaded by PM/CM techs on 7/12 1830GMT Shortwave data can be corrected with a simple multiplier as shown below. Longwave data must be reprocessed from temperature and netIR data. The data can be recalibrated as follows: First divide value by incorrectly applied cal coeff (first number) then multiply by correct cal coeff (second number). down_short_diffuse_hemisp 109.52 110.31 up_short_hemisp 111.61 109.80 short_direct_normal 115.73 118.82 down_short_hemisp 122.47 117.34 up_long_netir 0.26525 0.2564 down_long_netir 0.27173 0.2695 Reapply cal coeffs below using up_long_netIR(uV), inst_up_long_dome_temp(K), inst_up_long_dome_temp(K) using procedure described in SIRS instrument manual. up_long_hemisp k0 0.00 W/m^2 k1 0.2564 W/(m^2*uV) k2 1.00 unitless k3 -4.00 unitless kr 0.000 K/uV Reapply cal coeffs below using down_long_netIR(uV),inst_down_long_dome_temp (K),inst_down_long_dome_temp(K). down_long_hemisp_shaded k0 0.00 W/m^2 k1 0.2695 W/(m^2*uV) k2 1.00 unitless k3 -4.00 unitless kr 0.000 K/uV |
| Measurements: | sgpsirs20sE3.a0:
sgpsirsE3.b1:
|