| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D050106.4 | SGP/SIRS/C1 - Reprocess: UIR/DIR Incorrect calibration coefficients | sgpsirsC1.00, sgpsirsC1.b1 |
| D050117.1 | SGP/SIRS/E9 - Unknown -failed PSP ventilator fan | sgpsirs20sE9.a0, sgpsirsE9.00, sgpsirsE9.b1 |
| D050131.28 | SGP/SIRS/E8 - Ice storm | sgpsirs20sE8.a0, sgpsirsE8.b1 |
| D050131.29 | SGP/SIRS/E9 - Ice storm | sgpsirs20sE9.a0, sgpsirsE9.b1 |
| D050205.1 | SGP/SIRS/E1 - broken cable on DSDH (aka DD) measurment instrument - Eppley 8-48. | sgpsirs20sE1.a0, sgpsirsE1.00, sgpsirsE1.b1 |
| D050206.2 | SGP/SIRS/C1 - Monthly Summary | sgpsirsC1.b1 |
| D050218.1 | SGP/SIRS/E7 - Reprocessed: Corrected Downwelling Longwave calibrations | sgpsirsE7.b1 |
| D050307.3 | SGP/SIRS/E7 - Downwelling Shortwave incorrect | sgpsirsE7.00, sgpsirsE7.b1 |
| D050414.2 | SGP/SIRS/E9 - Downwelling Shortwave values low | sgpsirs20sE9.a0, sgpsirsE9.00, sgpsirsE9.b1 |
| D050606.1 | SGP/SIRS/E7 - Downwelling longwave incorrect | sgpsirs20sE7.a0, sgpsirsE7.00, sgpsirsE7.b1 |
| D050621.1 | SGP/SIRS/E9 - Sensor cable failure | sgpsirs20sE9.a0, sgpsirsE9.00, sgpsirsE9.b1 |
| D050801.1 | SGP/SIRS/E8 - Downwelling Shortwave hemispheric (PSP) Dome Contamination | sgpsirs20sE8.a0, sgpsirsE8.00, sgpsirsE8.b1 |
| D050929.1 | SGP/SIRS/C1 - sun tracker power failure | sgpsirs20sC1.a0, sgpsirsC1.00, sgpsirsC1.b1 |
| D060331.2 | SGP/SIRS/E1 - Intermittantly missing downwelling diffuse | sgpsirs20sE1.a0, sgpsirsE1.00, sgpsirsE1.b1 |
| D060630.15 | SGP/SIRS/E7 - Reprocessed: Longwave Calibration error | sgpsirsE7.b1 |
| D060630.16 | SGP/SIRS/E8 - Reprocessed: Longwave Calibration error | sgpsirsE8.b1 |
| D060630.17 | SGP/SIRS/E9 - Reprocessed: Longwave Calibration error | sgpsirsE9.b1 |
| D060630.8 | SGP/SIRS/C1 - Reprocessed: Longwave Calibration error | sgpsirsC1.b1 |
| D060630.9 | SGP/SIRS/E1 - Reprocessed: Longwave Calibration error | sgpsirsE1.b1 |
| 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 |
|---|---|---|---|
| 12/23/2004 | 2315 | 01/25/2005 | 1800 |
| Subject: | SGP/SIRS/E9 - Unknown -failed PSP ventilator fan |
| DataStreams: | sgpsirs20sE9.a0, sgpsirsE9.00, sgpsirsE9.b1 |
| 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 |
|---|---|---|---|
| 01/04/2005 | 2102 | 01/11/2005 | 1943 |
| Subject: | SGP/SIRS/E8 - Ice storm |
| DataStreams: | sgpsirs20sE8.a0, sgpsirsE8.b1 |
| Description: | Data missing due to ice storm. |
| Measurements: | sgpsirs20sE8.a0:
sgpsirsE8.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/05/2005 | 0702 | 01/09/2005 | 1448 |
| Subject: | SGP/SIRS/E9 - Ice storm |
| DataStreams: | sgpsirs20sE9.a0, sgpsirsE9.b1 |
| Description: | Data missing due to ice storm. |
| Measurements: | sgpsirs20sE9.a0:
sgpsirsE9.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/30/2004 | 2100 | 02/08/2005 | 2055 |
| Subject: | SGP/SIRS/E1 - broken cable on DSDH (aka DD) measurment instrument - Eppley 8-48. |
| DataStreams: | sgpsirs20sE1.a0, sgpsirsE1.00, sgpsirsE1.b1 |
| Description: | Occasionally, the downwelling shortwave diffuse hemispheric (DSDH) readings spike to unreasonably low levels, causing derived downwelling shortwave hemispheric (DSH) readings to spike well below the actual DSH readings. Technicians repaired the DSDH instument (an Eppley 8-48) cable on 02/08/2005 2055GMT. There have been no dropouts since that time. |
| Measurements: | sgpsirs20sE1.a0:
sgpsirsE1.b1:
sgpsirsE1.00:
|
| 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 |
|---|---|---|---|
| 11/02/2004 | 2045 | 02/22/2005 | 2050 |
| Subject: | SGP/SIRS/E7 - Reprocessed: Corrected Downwelling Longwave calibrations |
| DataStreams: | sgpsirsE7.b1 |
| Description: | Incorrect DIR calibration coeffs and serial numbers were applied to the data from 11/02/2004 when the shortwave instruments were changed out. Field techs corrected the program during longwave instrument replacement on 2/22/2005. The data were reprocessed in September 2006 to apply the correct calibrations. The reprocessed data were archived in October 2006. |
| Measurements: | sgpsirsE7.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/03/2005 | 2200 | 04/05/2005 | 1950 |
| Subject: | SGP/SIRS/E7 - Downwelling Shortwave incorrect |
| DataStreams: | sgpsirsE7.00, sgpsirsE7.b1 |
| Description: | Downwelling shortwave values dropped off to unrealistic values frequently at this site (usually between 1600 GMT and 0000 GMT). SGP techs found this was due to a bad multiplexer and it was replaced 04/05/2005 1950GMT along with the downwelling shortwave cable. |
| Measurements: | sgpsirsE7.b1:
sgpsirsE7.00:
|
| 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: | sgpsirs20sE9.a0, sgpsirsE9.00, sgpsirsE9.b1 |
| 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 |
|---|---|---|---|
| 04/05/2005 | 1950 | 04/19/2005 | 2100 |
| Subject: | SGP/SIRS/E7 - Downwelling longwave incorrect |
| DataStreams: | sgpsirs20sE7.a0, sgpsirsE7.00, sgpsirsE7.b1 |
| Description: | During maintenance to correct a problem with the downwelling shortwave data, the downwelling longwave instrument wiring was not properly fastened resulting in incorrect downwelling longwave hemispheric data. |
| Measurements: | sgpsirs20sE7.a0:
sgpsirsE7.b1:
sgpsirsE7.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/13/2005 | 2115 | 06/20/2005 | 2200 |
| Subject: | SGP/SIRS/E9 - Sensor cable failure |
| DataStreams: | sgpsirs20sE9.a0, sgpsirsE9.00, sgpsirsE9.b1 |
| 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 |
|---|---|---|---|
| 07/27/2005 | 1930 | 08/09/2005 | 1940 |
| Subject: | SGP/SIRS/E8 - Downwelling Shortwave hemispheric (PSP) Dome Contamination |
| DataStreams: | sgpsirs20sE8.a0, sgpsirsE8.00, sgpsirsE8.b1 |
| Description: | The downelling shortwave hemispheric instrument (Eppley PSP) dome at this site had dirt or a smudge on it. This was most noticeable during mid to late afternoon hours (around 2100 GMT). PM cleaned the dome on 8/9/05 1940, correcting the problem. |
| Measurements: | sgpsirsE8.00:
sgpsirs20sE8.a0:
sgpsirsE8.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/27/2005 | 1430 | 09/27/2005 | 1630 |
| Subject: | SGP/SIRS/C1 - sun tracker power failure |
| DataStreams: | sgpsirs20sC1.a0, sgpsirsC1.00, sgpsirsC1.b1 |
| Description: | C1 experienced a sun tracker power faulure. The tracker was reset by onsite personnel shortly after the power failed. Only shaded and direct instruments were affected - i.e. the downwelling diffuse measurement from the 8-48 B&W pyranometer and the direct normal measurement from the NIP pyrheliometer. The downwelling longwave PIR data was unaffected by this event. |
| Measurements: | sgpsirsC1.b1:
sgpsirsC1.00:
sgpsirs20sC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/26/2005 | 1630 | 04/04/2006 | 2005 |
| Subject: | SGP/SIRS/E1 - Intermittantly missing downwelling diffuse |
| DataStreams: | sgpsirs20sE1.a0, sgpsirsE1.00, sgpsirsE1.b1 |
| Description: | Starting on or about 10/26/2005 the downwelling diffuse hemispheric irradiance (Eppley 8-48) instrument had intermittant missing values. Technicians found a loose wire on the instrument connector and repaired it on 4/4/2006. Use global shortwave hemispheric (PSP) component - normal incident component (CosZA*NIP) to calulate diffuse component. Comparison of absolute difference between actual and computed diffuse component values and diffuse standard deviations > 1-2 W/m2 can help filter the noisy diffuse data. There is no standard method. |
| Measurements: | sgpsirs20sE1.a0:
sgpsirsE1.b1:
sgpsirsE1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/20/2004 | 2000 | 02/07/2006 | 2005 |
| Subject: | SGP/SIRS/E7 - Reprocessed: Longwave Calibration error |
| DataStreams: | sgpsirsE7.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 October 2006. |
| Measurements: | sgpsirsE7.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/10/2004 | 1845 | 02/21/2006 | 1840 |
| Subject: | SGP/SIRS/E8 - Reprocessed: Longwave Calibration error |
| DataStreams: | sgpsirsE8.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 instanteous data records. Still, these data are considered far superior to the originally processed data. The reprocessed data were archived in September 2006. |
| Measurements: | sgpsirsE8.b1:
|
| 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 |
|---|---|---|---|
| 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 |
|---|---|---|---|
| 02/10/2004 | 2055 | 02/21/2006 | 2007 |
| Subject: | SGP/SIRS/E1 - Reprocessed: Longwave Calibration error |
| DataStreams: | sgpsirsE1.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 October 2006. |
| Measurements: | sgpsirsE1.b1:
|