| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D030110.36 | SGP/SIRS/E10 - Noisy UIR | sgpsirsE10.a2, sgpsirsE10.b1, sgpsirs60sE10.a1 |
| D030701.1 | SGP/SIRS/E10 - Noisy US(upwelling shortwave) data stream problem | sgpsirsE10.00, sgpsirsE10.b1, sgpsirs20sE10.a0 |
| D031020.2 | SGP/SIRS/E9 - Possible instrument drift | sgpsirsE9.00, sgpsirsE9.b1, sgpsirs20sE9.a0 |
| D031027.1 | SGP/SIRS/E10 - Noisy UIR (upwelling longwave)data stream problem | sgpsirsE10.00, sgpsirsE10.b1, sgpsirs20sE10.a0 |
| D040226.1 | SGP/SIRS/E9 - PSP dome contamination | sgpsirsE9.00, sgpsirsE9.b1, sgpsirs20sE9.a0 |
| D040831.4 | SGP/SIRS/E10 - Reprocess: Incorrect shortwave radiometer calibration coefficients | sgpsirsE10.00, sgpsirsE10.b1 |
| D041206.1 | SGP/SIRS/E10 - tracker failure | sgpsirsE10.00, sgpsirsE10.b1, sgpsirs20sE10.a0 |
| D050117.1 | SGP/SIRS/E9 - Unknown -failed PSP ventilator fan | sgpsirsE9.00, sgpsirsE9.b1, sgpsirs20sE9.a0 |
| D050131.29 | SGP/SIRS/E9 - Ice storm | sgpsirsE9.b1, sgpsirs20sE9.a0 |
| D050414.2 | SGP/SIRS/E9 - Downwelling Shortwave values low | sgpsirsE9.00, sgpsirsE9.b1, sgpsirs20sE9.a0 |
| D050621.1 | SGP/SIRS/E9 - Sensor cable failure | sgpsirsE9.00, sgpsirsE9.b1, sgpsirs20sE9.a0 |
| D060630.17 | SGP/SIRS/E9 - Reprocessed: Longwave Calibration error | sgpsirsE9.b1 |
| D060630.18 | SGP/SIRS/E10 - Reprocessed: Longwave Calibration error | sgpsirsE10.b1 |
| D060718.2 | SGP/SIRS/E9 - Tracker Failure | sgpsirsE9.00, sgpsirsE9.b1, sgpsirs20sE9.a0 |
| D070312.1 | SGP/SIRS/E9 - Tracker failure | sgpsirsE9.00, sgpsirsE9.b1, sgpsirs20sE9.a0 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/01/2002 | 0000 | 11/08/2002 | 1900 |
| Subject: | SGP/SIRS/E10 - Noisy UIR |
| DataStreams: | sgpsirsE10.a2, sgpsirsE10.b1, sgpsirs60sE10.a1 |
| Description: | Upwelling Infrared irradiance signals noisy resulting from problems with pyrgeometer signal cable connections. |
| Measurements: | sgpsirsE10.b1:
sgpsirsE10.a2:
sgpsirs60sE10.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/22/2003 | 0146 | 07/02/2003 | 1400 |
| Subject: | SGP/SIRS/E10 - Noisy US(upwelling shortwave) data stream problem |
| DataStreams: | sgpsirsE10.00, sgpsirsE10.b1, sgpsirs20sE10.a0 |
| Description: | Beginning 6/22, upwelling shortwave values frequently dropped well
below 0 W/m^2 (occasionally dropping below -50 W/m^2) during the
nighttime hours. Daytime values were excessively high and noisy.
Instrument wiring was suspected and was corrected 07/02/2003. |
| Measurements: | sgpsirsE10.b1:
sgpsirsE10.00:
sgpsirs20sE10.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/14/2003 | 0000 | 10/21/2003 | 1600 |
| Subject: | SGP/SIRS/E9 - Possible instrument drift |
| DataStreams: | sgpsirsE9.00, sgpsirsE9.b1, sgpsirs20sE9.a0 |
| Description: | Downwelling shortwave values were too low, dropping below -10 W/m^2
at night and reading 30-50 W/m^2 lower than DS calculated from
direct and diffuse measurements during the day. This problem became
more noticeable beginning on 10/14, when nighttime values began to
drop below -10 W/m^2 consistently. The problem was corrected with
the annual instrument changout on 10/23/03.
Although the downwelling shortwave instrument (DS) appears to be the
problem a more likely scenario is that the cable connections became
thermopile. The instrument changeout possibly reseated and corrected
any poor connections. |
| Measurements: | sgpsirs20sE9.a0:
sgpsirsE9.b1:
sgpsirsE9.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/29/2003 | 1500 | 08/06/2003 | 0500 |
| Subject: | SGP/SIRS/E10 - Noisy UIR (upwelling longwave)data stream problem |
| DataStreams: | sgpsirsE10.00, sgpsirsE10.b1, sgpsirs20sE10.a0 |
| Description: | Beginning 6/29, upwelling longwave (UIR) values frequently
exceeded quality control boundaries and appeared excessively
noisy. Instrument wiring was suspected. Data remained noisy
until 08/06/2003 0500GMT when the UIR data returned to normal. |
| Measurements: | sgpsirsE10.b1:
sgpsirs20sE10.a0:
sgpsirsE10.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/20/2004 | 1600 | 02/23/2004 | 0500 |
| Subject: | SGP/SIRS/E9 - PSP dome contamination |
| DataStreams: | sgpsirsE9.00, sgpsirsE9.b1, sgpsirs20sE9.a0 |
| Description: | Measured values of diffuse shortwave downwelling radiation fluctuated below derived values of downwelling shortwave radiation by 50 W/m^2 during the afternoon hours under clear conditions. SMOS precipitation and wind speed data reveals rain and wind the night before on 02/20/03 0100 GMT probably contaminated the PSP dome with dirt. Precipitation of .25mm on 02/23/04 0300 seems to have effectively cleared the PSP dome since PSP data on 02/24/04 compares correctly to direct and diffuse components. |
| Measurements: | sgpsirs20sE9.a0:
sgpsirsE9.b1:
sgpsirsE9.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/20/2004 | 1630 | 04/21/2004 | 1425 |
| Subject: | SGP/SIRS/E10 - Reprocess: Incorrect shortwave radiometer calibration coefficients |
| DataStreams: | sgpsirsE10.00, sgpsirsE10.b1 |
| Description: | During the pyrgeometer instrument (PIR) changeout a datalogger program was loaded with incorrect calibration coefficients for the shortwave instruments. The affected measurements (instruments) were: downwelling diffuse (8-48), upwelling shortwave (PSP), direct normal (NIP) and downwelling shortwave (PSP) Recalculate irradiances by determining original mV signal and reapplying the correct calibration coefficients. For SGP/SIRS/E10 and each one minute irradiance value perform the following calculations by instrument: DD(corrected) = (DD/107.24)*114.63 US(corrected) = (US/113.19)*117.46 NIP(corrected)= (NIP/120.17)*119.26 DS(corrected) = (DS/118.46)*122.78 |
| Measurements: | sgpsirsE10.b1:
sgpsirsE10.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/04/2004 | 1800 | 01/26/2005 | 1600 |
| Subject: | SGP/SIRS/E10 - tracker failure |
| DataStreams: | sgpsirsE10.00, sgpsirsE10.b1, sgpsirs20sE10.a0 |
| Description: | During the night of 11/05-06 2004 the tracker failed at this location. During CM on 12/01, power cycling returned the tracker to service. However, tracker was not properly tracking in the AM. Tracker failed again sometime near 01/01/2005. CM on reloaded the tracker program and realigned the tracker on 01/26/2005 1600GMT. It has been working correctly since this time. |
| Measurements: | sgpsirsE10.b1:
sgpsirsE10.00:
sgpsirs20sE10.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/23/2004 | 2315 | 01/25/2005 | 1800 |
| Subject: | SGP/SIRS/E9 - Unknown -failed PSP ventilator fan |
| DataStreams: | sgpsirsE9.00, sgpsirsE9.b1, sgpsirs20sE9.a0 |
| Description: | Downwelling shortwave hemispheric (DSH) readings appear to have a slight to moderate negative offset from derived DSH values. At night, this negative offset causes qc flags (since values are below the minimum threshold of -10 W/m^2). Differences between derived and actual DSH values are sometimes on the order of 50 W/m^2 due to this offset. The offset was discovered to be due to a failed ventilator fan which is used to clear the dome of the PSP, the instrument which measures the DSH. The ventilator likely seized or was intermittent and heated the PSP base giving an erroneous DSH reading. Field techs replaced the fan on 01/25/2005 1745GMT. The DSH has been reading normally since that time. |
| Measurements: | sgpsirs20sE9.a0:
sgpsirsE9.b1:
sgpsirsE9.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/05/2005 | 0702 | 01/09/2005 | 1448 |
| Subject: | SGP/SIRS/E9 - Ice storm |
| DataStreams: | sgpsirsE9.b1, sgpsirs20sE9.a0 |
| Description: | Data missing due to ice storm. |
| Measurements: | sgpsirs20sE9.a0:
sgpsirsE9.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/30/2005 | 0103 | 04/19/2005 | 1720 |
| Subject: | SGP/SIRS/E9 - Downwelling Shortwave values low |
| DataStreams: | sgpsirsE9.00, sgpsirsE9.b1, sgpsirs20sE9.a0 |
| Description: | Downwelling Shortwave Hemispheric (DSH) irradiance values from the pyranometer instrument were frequently below the MIN value of -10 W/m^2 at night. DSH values also frequently disagreed with derived readings (at times well over 50 W/m^2 difference) during the daylight hours, especially in the morning. Field techs performed maintenance but could not find obvious instrument or connection problems. The low DSH values during nighttime were on the threshold of acceptable. Largest offsets acceptable with these pyranometers is typically -10 W/m2. The large derived vs. actual DSH differences during the daylight hours are the subject of ongoing ARM investigation. No instrument problems could be identified. |
| Measurements: | sgpsirs20sE9.a0:
sgpsirsE9.b1:
sgpsirsE9.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/13/2005 | 2115 | 06/20/2005 | 2200 |
| Subject: | SGP/SIRS/E9 - Sensor cable failure |
| DataStreams: | sgpsirsE9.00, sgpsirsE9.b1, sgpsirs20sE9.a0 |
| Description: | The short_direct_normal measurements from the normal incident pyrheliometer (NIP) instrument were missing beginning 6/13/2005 2115GMT. On 6/20/2005 technicians found the NIP instrument cable broken, replaced it, and returned the instrument to service at 2200GMT. |
| Measurements: | sgpsirs20sE9.a0:
sgpsirsE9.b1:
sgpsirsE9.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/17/2003 | 1640 | 02/07/2006 | 1730 |
| Subject: | SGP/SIRS/E9 - Reprocessed: Longwave Calibration error |
| DataStreams: | sgpsirsE9.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 instanteous data records. Still, these data are considered far superior to the originally processed data. The reprocessed data were archived in October 2006. |
| Measurements: | sgpsirsE9.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/20/2004 | 1730 | 02/07/2006 | 2130 |
| Subject: | SGP/SIRS/E10 - Reprocessed: Longwave Calibration error |
| DataStreams: | sgpsirsE10.b1 |
| Description: | Modified pyrgeometer calibration procedures were implemented beginning in February 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: | sgpsirsE10.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/12/2006 | 1100 | 07/21/2006 | 1635 |
| Subject: | SGP/SIRS/E9 - Tracker Failure |
| DataStreams: | sgpsirsE9.00, sgpsirsE9.b1, sgpsirs20sE9.a0 |
| Description: | On July 12th the SIRS tracker failed to wake up that morning. On the 21st of July CM repaired the tracker. |
| Measurements: | sgpsirs20sE9.a0:
sgpsirsE9.b1:
sgpsirsE9.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/14/2007 | 0000 | 02/20/2007 | 1800 |
| Subject: | SGP/SIRS/E9 - Tracker failure |
| DataStreams: | sgpsirsE9.00, sgpsirsE9.b1, sgpsirs20sE9.a0 |
| Description: | During this time range the solar tracker at E9 was not operating. PM on 2/20 1800GMT power cycled the tracker and it resumed normal operation. |
| Measurements: | sgpsirs20sE9.a0:
sgpsirsE9.b1:
sgpsirsE9.00:
|