DQR ID | Subject | Data Streams Affected |
---|---|---|
D030715.1 | SGP/SIRS/E3 - Degraded upwelling longwave data | sgpsirsE3.00 |
D030715.2 | SGP/SIRS/E5 - Downwelling direct normal (NIP) reporting low | sgpsirsE5.00 |
D031208.6 | SGP/SIRS/E4 - Shadowband Misalignment | sgpsirsE4.00 |
D040205.1 | SGP/SIRS/E1/E2/E3/E5/E8 - Snow on Radiometers | sgpsirsE3.00, sgpsirsE5.00 |
D040320.1 | SGP/SIRS/E5 - anomalously low NIP readings | sgpsirsE5.00 |
D040420.2 | SGP/SIRS/E5 - Dirt on PSP Dome | sgpsirsE5.00 |
D050726.1 | SGP/SIRS/E4 - Dirt on Dome | sgpsirsE4.00 |
D070205.2 | SGP/SIRS/E5 - Dirty radiometers | sgpsirsE5.00 |
D080128.1 | SGP/SIRS/C1/E1/E10/E11/E12/E13/E15/E16/E18/E19/E2/E20/E21/E22/E24/E25/E27/E3/E4/E5/E6/E7/E8/E9 - Ice | sgpsirsE5.00, sgpsirsE4.00, sgpsirsE3.00 |
D080701.1 | SGP/SIRS/E5 - Incorrect Calibration Coefficient | sgpsirsE5.00 |
D150504.2 | SGP/SIRS/E4 - Tracker malfunction | sgpsirsE4.00 |
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 |
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:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/11/2003 | 1630 | 07/16/2003 | 1840 |
Subject: | SGP/SIRS/E5 - Downwelling direct normal (NIP) reporting low |
DataStreams: | sgpsirsE5.00 |
Description: | There were large differences between the measured downwelling shortwave (DS) and the downwelling shortwave calculated from direct (NIP) and diffuse (DD) readings. It appears that the direct normal shortwave readings were much too low, particularly on 7/14 and 7/15. It appears that the diffuse instrument was being shaded properly, but the NIP was not tracking the sun. The problem was corrected during the preventative maintenance visit on 7/16/03 at 1840GMT. The technician reported doing the quarterly connection corrosion checks and ventilator fan cleaning, the NIP was described as having "dry-light dust" on the window, no mention of tracker alignment was made. Although uncertain, a bad connection at some point in the instrument wiring was likely to blame and was eliminated during the corrosion inspection process. |
Measurements: | sgpsirsE5.00:
|
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 |
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:
|
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: | sgpsirsE3.00, sgpsirsE5.00 |
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: | sgpsirsE3.00:
sgpsirsE5.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/17/2004 | 1843 | 03/28/2004 | 0300 |
Subject: | SGP/SIRS/E5 - anomalously low NIP readings |
DataStreams: | sgpsirsE5.00 |
Description: | Direct normal (NIP instrument) irradiance readings fall anomalously on 3/17 18:43GMT to less than half the expected values during clear sky conditions. NIP readings returned to normal on 3/28/04 12:00. Maintenance on 3/29/04 19:48 revealed no unusual contaminents. Precipitation on 3/27 (measured by the SMOS system) probably cleared the NIP window of contaminents before scheduled maintenance. |
Measurements: | sgpsirsE5.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/11/2004 | 1200 | 05/05/2004 | 1645 |
Subject: | SGP/SIRS/E5 - Dirt on PSP Dome |
DataStreams: | sgpsirsE5.00 |
Description: | The PSP dome was dirty. The magnitude of differences from derived vs. measured values of downwelling shortwave were about 75 W/m^2. Preventative maintenance on 4/21 cleaned instruments but they became dirty again immediately afterward and continued to be so until the next PM on 5/5. |
Measurements: | sgpsirsE5.00:
|
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 |
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:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/23/2007 | 1500 | 01/30/2007 | 0000 |
Subject: | SGP/SIRS/E5 - Dirty radiometers |
DataStreams: | sgpsirsE5.00 |
Description: | Snow or heavy dirt may have been covering one side of the PSP or 8-48 domes. The start of the problem coincides with a preciption event. We may assume that the offending substance was snow and it melted by 1/30/2007. PM after this time reports dry-light dust on radiometers. |
Measurements: | sgpsirsE5.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/10/2007 | 0000 | 12/25/2007 | 2359 |
Subject: |
|
DataStreams: | sgpsirsE5.00, sgpsirsE4.00, sgpsirsE3.00 |
Description: | Ice storms affected the SGP central and extended facilities starting Dec 10 0000GMT to mid/late December. Each facility was affected at various times and degrees dependant on elevation, latitude and whether power failed for short or extended periods of time. By December 15th most ice had melted from the radiometers at all the faclities but power outages and tracker failures persisted at some stations. |
Measurements: | sgpsirsE4.00:
sgpsirsE3.00:
sgpsirsE5.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/25/2008 | 1736 | 07/10/2008 | 1530 |
Subject: | SGP/SIRS/E5 - Incorrect Calibration Coefficient |
DataStreams: | sgpsirsE5.00 |
Description: | When instruments were changed out on 6/25 the UIR (up_long_hemisp measurement) S/N and cal coefficient reverted to a previous UIR instrument that was damaged and removed on 12/28/2007. The UIR S/N should be 31637F3 with corresponding cal K=.2526 instead of applied value of K=.2571. However, for the PIR longwave instrument in this inverted position (UIR) the K1 term contributes approximately 0-7% of the total upwelling longwave signal throughout the day, or about 0-30 W/m2. The cal coefficient is too high by approximately 2%. Thus, the UIR data, as is, ranges from 0 to .6 W/m2 too low since this term is always negative. The uncertainty of this instrument is approximately +-10 W/m2 with respect to the WSIG. Reprocessing is not recommended. |
Measurements: | sgpsirsE5.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/22/1999 | 0000 | 03/01/2000 | 2359 |
Subject: | SGP/SIRS/E4 - Tracker malfunction |
DataStreams: | sgpsirsE4.00 |
Description: | Tracker failure resulted in incorrect tracked data. |
Measurements: | sgpsirsE4.00:
|