| 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 | sgpsirsE9.00, sgpsirsE9.b1, sgpsirs20sE9.a0 |
| D050131.25 | SGP/SIRS/E2 - Ice storm | sgpsirsE2.b1, sgpsirs20sE2.a0 |
| D050131.26 | SGP/SIRS/E5 - Ice storm | sgpsirsE5.b1, sgpsirs20sE5.a0 |
| D050131.27 | SGP/SIRS/E6 - Ice storm | sgpsirsE6.b1, sgpsirs20sE6.a0 |
| D050131.28 | SGP/SIRS/E8 - Ice storm | sgpsirsE8.b1, sgpsirs20sE8.a0 |
| D050131.29 | SGP/SIRS/E9 - Ice storm | sgpsirsE9.b1, sgpsirs20sE9.a0 |
| D050205.1 | SGP/SIRS/E1 - broken cable on DSDH (aka DD) measurment instrument - Eppley 8-48. | sgpsirsE1.00, sgpsirsE1.b1, sgpsirs20sE1.a0 |
| D050205.2 | SGP/SIRS/E6 - Questionable data due to Ice Storm damage | sgpsirsE6.00, sgpsirsE6.b1, sgpsirs20sE6.a0 |
| D050205.3 | SGP/SIRS/E2 - Tracker mis-alignment | sgpsirsE2.00, sgpsirsE2.b1, sgpsirs20sE2.a0 |
| D050206.2 | SGP/SIRS/C1 - Monthly Summary | sgpsirsC1.b1 |
| D050218.1 | SGP/SIRS/E7 - Incorrect DIR calibration coefficients | sgpsirsE7.00, sgpsirsE7.b1, sgpsirs20sE7.a0 |
| D050303.1 | SGP/SIRS/E2 - Incorrect DIR calibration coefficients | sgpsirsE2.00, sgpsirsE2.b1, sgpsirs20sE2.a0 |
| D050307.3 | SGP/SIRS/E7 - Downwelling Shortwave incorrect | sgpsirsE7.00, sgpsirsE7.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 | 180 |
| 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 | 92 | 01/13/2005 | 1618 |
| Subject: | SGP/SIRS/E2 - Ice storm |
| DataStreams: | sgpsirsE2.b1, sgpsirs20sE2.a0 |
| Description: | Data missing due to ice storm. |
| Measurements: | sgpsirsE2.b1:
sgpsirs20sE2.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/04/2005 | 222 | 01/12/2005 | 202 |
| Subject: | SGP/SIRS/E5 - Ice storm |
| DataStreams: | sgpsirsE5.b1, sgpsirs20sE5.a0 |
| Description: | Data missing due to ice storm. |
| Measurements: | sgpsirsE5.b1:
sgpsirs20sE5.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/05/2005 | 22 | 01/09/2005 | 1630 |
| Subject: | SGP/SIRS/E6 - Ice storm |
| DataStreams: | sgpsirsE6.b1, sgpsirs20sE6.a0 |
| Description: | Data missing due to ice storm. |
| Measurements: | sgpsirs20sE6.a0:
sgpsirsE6.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/04/2005 | 212 | 01/11/2005 | 1943 |
| Subject: | SGP/SIRS/E8 - Ice storm |
| DataStreams: | sgpsirsE8.b1, sgpsirs20sE8.a0 |
| Description: | Data missing due to ice storm. |
| Measurements: | sgpsirs20sE8.a0:
sgpsirsE8.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/05/2005 | 72 | 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 |
|---|---|---|---|
| 12/30/2004 | 210 | 02/08/2005 | 2055 |
| Subject: | SGP/SIRS/E1 - broken cable on DSDH (aka DD) measurment instrument - Eppley 8-48. |
| DataStreams: | sgpsirsE1.00, sgpsirsE1.b1, sgpsirs20sE1.a0 |
| 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 |
|---|---|---|---|
| 01/13/2005 | 120 | 02/10/2005 | 170 |
| Subject: | SGP/SIRS/E6 - Questionable data due to Ice Storm damage |
| DataStreams: | sgpsirsE6.00, sgpsirsE6.b1, sgpsirs20sE6.a0 |
| Description: | Several SIRS readings at E6 readings have appeared questionable since the ice storm in early January. Starting on 01/13 maintenance found the E6 tracker inoperative. It was reset and put back into serivice. Shortly after, on 01/16 data from the DSH instrument (PSP) became questionable possibly due to obstructed or failed ventilator fan. On 02/10 1645 GMT maintenance found the DSH instrument ventilator fan failed - the fan was replaced, the E6 tracker was also realigned. Due to early january ice storms, the tracker alignment issues and a failed ventilator fan - All tracker mounted and global DS instrument measurements are suspect for this time frame. |
| Measurements: | sgpsirs20sE6.a0:
sgpsirsE6.00:
sgpsirsE6.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/03/2005 | 1654 | 02/05/2005 | 2359 |
| Subject: | SGP/SIRS/E2 - Tracker mis-alignment |
| DataStreams: | sgpsirsE2.00, sgpsirsE2.b1, sgpsirs20sE2.a0 |
| Description: | The solar tracker was not working correctly at this site from 2/3/2005 to 2/5/2005 2359GMT. After this time tracker mounted instruments appear to have been responding correctly. There was no maintenance intervention that rectified the tracking problem. This has happened in the past with the SGP SciTec trackers. |
| Measurements: | sgpsirsE2.b1:
sgpsirs20sE2.a0:
sgpsirsE2.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/01/2004 | 00 | 01/01/2005 | 00 |
| 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 - Incorrect DIR calibration coefficients |
| DataStreams: | sgpsirsE7.00, sgpsirsE7.b1, sgpsirs20sE7.a0 |
| 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. Users may wish to attempt to reprocess the data by applying the following method. Note, this may result in additional errors due to the averaging of the 20s data. Use 20s data (available averaged in 60s b1 file) to reconstruct downwelling IR (DIR) data from the PIR instrument. Use case and dome temperatures as supplied in variables: inst_down_long_dome_temp[K] inst_down_long_case_temp[K] Back out thermopile(tp) output in mV from the tp in W/m2 as described: tp[mV] = (down_long_netir[W/m2]/WrongK1[W/(m2*uV)])/1000 where WrongK1 is the K1 term applied to the DIR during the DQR period. Use the following coefficients to recreate the dataset following the described method in the SIRS handbook Sec 7.1.2 available at http://www.arm.gov/instruments/instrument.php?id=33 The coefficients to be used are as follows: WrongK1 = .2476 K0 = -14.61 K1 = .24832 K2 = 1.028 K3 = -2.249 Kr = 7.044E-4 |
| Measurements: | sgpsirs20sE7.a0:
sgpsirsE7.b1:
sgpsirsE7.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/10/2005 | 1620 | 03/10/2005 | 160 |
| Subject: | SGP/SIRS/E2 - Incorrect DIR calibration coefficients |
| DataStreams: | sgpsirsE2.00, sgpsirsE2.b1, sgpsirs20sE2.a0 |
| Description: | During the DIR/UIR instrument changout on 2/10/2005 the new datalogger program contained incorrect calibration coefficients for the DIR instrument. Technicians corrected the program on 3/10/2005. Users may wish to attempt to reprocess the data by applying the following method. Note, this may result in additional errors due to the averaging of the 20s data. Use 20s data (available averaged in 60s b1 file) to reconstruct downwelling IR (DIR) data from the PIR instrument. Use case and dome temperatures as supplied in variables: inst_down_long_dome_temp[K] inst_down_long_case_temp[K] Back out thermopile(tp) output in mV from the tp in W/m2 as described: tp[mV] = (down_long_netir[W/m2]/WrongK1[W/(m2*uV)])/1000 where WrongK1 is the K1 term applied to the DIR during the DQR period. Use the following coefficients to recreate the dataset following the described method in the SIRS handbook Sec 7.1.2 available at http://www.arm.gov/instruments/instrument.php?id=33 The coefficients to be used are as follows: WrongK1 = .2251 K0 = -26.00 K1 = .2680 K2 = 1.056 K3 = -2.476 Kr = 7.044E-4 |
| Measurements: | sgpsirsE2.b1:
sgpsirsE2.00:
sgpsirs20sE2.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/03/2005 | 220 | 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:
|