DQR ID | Subject | Data Streams Affected |
---|---|---|
D030916.6 | SGP/BRS/C1 - low downwelling shortwave readings | sgpbrsC1.00, sgpbrsC1.a2, sgpbrs20sC1.a0, sgpbrs60sC1.a1 |
D030922.5 | SGP/SIRS/E2 - Ventilator Fan Failure | sgpsirsE2.00, sgpsirsE2.b1, sgpsirs20sE2.a0 |
D031020.1 | SGP/SIRS/E1 - failed SIRS multiplexer | sgpsirsE1.00, sgpsirsE1.b1, sgpsirs20sE1.a0 |
D031118.1 | SGP/SIRS/E1 - Unknown - Downwelling shaded longwave measurement incorrect | sgpsirsE1.00, sgpsirsE1.b1, sgpsirs20sE1.a0 |
D031124.8 | SGP/SIRS/E7 - Unknown problem with downwelling shortwave instrument (Eppley PSP) | sgpsirsE7.00, sgpsirsE7.b1, sgpsirs20sE7.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 |
D040226.2 | SGP/SIRS/E11 - PSP dome contamination | sgpsirsE11.00, sgpsirsE11.b1, sgpsirs20sE11.a0 |
D040227.3 | SGP/SIRS/E2 - Reprocess: Incorrect shortwave radiometer calibration coefficients | sgpsirsE2.00, sgpsirsE2.b1 |
D040320.2 | SGP/SIRS/E8 - Possible Contamination of DS PSP instrument | sgpsirsE8.00, sgpsirsE8.b1, sgpsirs20sE8.a0 |
D040608.2 | SGP/BRS/C1 - NIP sensor failure | sgpbrsC1.00, sgpbrsC1.b1, sgpbrs20sC1.a0 |
D040621.3 | SGP/SIRS/E7 - Reprocessed: Corrected downwelling longwave calibrations | sgpsirsE7.00, sgpsirsE7.b1 |
D040831.1 | SGP/SIRS/E1 - Reprocess: Incorrect shortwave radiometer calibration coefficients | sgpsirsE1.00, sgpsirsE1.b1 |
D040831.2 | SGP/SIRS/E7 - Reprocess: Incorrect shortwave radiometer calibration coefficients | sgpsirsE7.00, sgpsirsE7.b1 |
D040831.3 | SGP/SIRS/E8 - Reprocess: Incorrect shortwave radiometer calibration coefficients | sgpsirsE8.00, sgpsirsE8.b1 |
D040831.5 | SGP/SIRS/E11 - Reprocess: Incorrect shortwave radiometer calibration coefficients | sgpsirsE11.00, sgpsirsE11.b1 |
D050322.1 | SGP/BRS/C1 - low downwelling shortwave readings | sgpbrsC1.00, sgpbrsC1.b1, sgpbrs20sC1.a0 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/05/2001 | 0000 | 04/17/2003 | 2359 |
Subject: | SGP/BRS/C1 - low downwelling shortwave readings |
DataStreams: | sgpbrsC1.00, sgpbrsC1.a2, sgpbrs20sC1.a0, sgpbrs60sC1.a1 |
Description: | Downwelling shortwave (DS) values frequently drop below -10 W/m^2 at night, and are consistently 20-40 W/m^2 less than the calculated downwelling shortwave during the day in clear-sky conditions. Corrective maintenance on 12/1/2004 corrected this offset. It is not clear which CM action corrected the problem since the DS instrument cable was grounded to a new location and the DS ventilator fan was found in poor condition and was replaced. Either of these issues could have led to the problem observed in this instrument. |
Measurements: | sgpbrs20sC1.a0:
sgpbrsC1.00:
sgpbrs60sC1.a1:
sgpbrsC1.a2:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/14/2003 | 1000 | 09/25/2003 | 1543 |
Subject: | SGP/SIRS/E2 - Ventilator Fan Failure |
DataStreams: | sgpsirsE2.00, sgpsirsE2.b1, sgpsirs20sE2.a0 |
Description: | Measured downwelling shortwave data was very questionable, reporting nighttime values as low as -50 W/m^2, while differing from calculated downwelling shortwave by as much as 50 W/m^2 lower during the day. The first indication of a problem was around 10 UTC, 9/14, when measured DS values suddenly dropped below 10 W/m^2 for about a 2 hour period before sunrise, then were consistently lower than calculated DS by as much as 40 W/m^2 during the day. The problem got progressively worse with time until the ventilator fan was replace on 9/25. Ventilator fan failure changed the fundamental operating characteristics of this PSP and resulted in unpredictable biased measurements which cannot be corrected without additional empirical characterization of the radiometer in question. |
Measurements: | sgpsirsE2.b1:
sgpsirs20sE2.a0:
sgpsirsE2.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/14/2003 | 2023 | 10/21/2003 | 1930 |
Subject: | SGP/SIRS/E1 - failed SIRS multiplexer |
DataStreams: | sgpsirsE1.00, sgpsirsE1.b1, sgpsirs20sE1.a0 |
Description: | Beginning 10/14, a failed multiplexer resulted in missing downwelling shortwave data and downwelling and upwelling longwave data which were much too low. The multiplexer handles data for the longwave instruments (UIR and DIR) case and dome temperatures as well as the downwelling shortwave hemispheric instrument (DS). |
Measurements: | sgpsirs20sE1.a0:
sgpsirsE1.b1:
sgpsirsE1.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/11/2003 | 0438 | 11/18/2003 | 2200 |
Subject: | SGP/SIRS/E1 - Unknown - Downwelling shaded longwave measurement incorrect |
DataStreams: | sgpsirsE1.00, sgpsirsE1.b1, sgpsirs20sE1.a0 |
Description: | Downwelling longwave values were very noisy and out of range due to a missing PIR case temperature measurement. Faulty wiring to the case temperature thermistor on the downwelling longwave IR instrument (PIR) was the likely cause of the problem. On 11/18, the E1 tracker and associated instruments (direct shortwave -NIP, hemispheric shaded shortwave -8-48 and hemispheric shaded longwave - problem PIR) were moved to a new tracker stand. Rewiring the instrument corrected the problem. |
Measurements: | sgpsirs20sE1.a0:
sgpsirsE1.b1:
sgpsirsE1.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/21/2003 | 0317 | 12/03/2003 | 0000 |
Subject: | SGP/SIRS/E7 - Unknown problem with downwelling shortwave instrument (Eppley PSP) |
DataStreams: | sgpsirsE7.00, sgpsirsE7.b1, sgpsirs20sE7.a0 |
Description: | Beginning around 0317 UTC, 11/21, downwelling shortwave values became anamolously high during the night, when they should have been around zero. Values returned to normal after SGP technicians reseated this instruments connections at 1215UTC 12/02/2003. The following day's data appeared normal. Appears that a poor connection was the culprit this time. |
Measurements: | sgpsirs20sE7.a0:
sgpsirsE7.b1:
sgpsirsE7.00:
|
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: | 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 |
---|---|---|---|
02/20/2004 | 1500 | 03/01/2004 | 1300 |
Subject: | SGP/SIRS/E11 - PSP dome contamination |
DataStreams: | sgpsirsE11.00, sgpsirsE11.b1, sgpsirs20sE11.a0 |
Description: | Measured values of diffuse shortwave downwelling radiation fluctuated below derived values of downwelling shortwave radiation during the afternoon hours under clear conditions, probably due to a dirty PSP dome. SMOS precipitation and wind speed data reveal rain and wind on 02/19/03 at 2300 GMT probably contaminated the PSP dome with dirt. Precipitation of .4mm on 02/29/04 1400 seems to have effectively cleared the PSP dome since PSP data on 03/01/04 compares correctly to direct and diffuse components. |
Measurements: | sgpsirsE11.b1:
sgpsirsE11.00:
sgpsirs20sE11.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/12/2004 | 1612 | 03/25/2004 | 1600 |
Subject: | SGP/SIRS/E2 - Reprocess: Incorrect shortwave radiometer calibration coefficients |
DataStreams: | sgpsirsE2.00, sgpsirsE2.b1 |
Description: | During the pyrgeometer instrument (PIR) changout a datalogger program was loaded with incorrect calibration coefficients for the shortwave instruments. The affected measurements were : downwelling diffuse (DD), upwelling shortwave(US), direct normal (NIP) and downwelling shortwave(DS) Recalculate irradiances by determining original mV signal and reapplying the correct calibration coefficients. For each one minute irradiance value perform the following calculations by instrument: DD(corrected) = (DD/107.24)*118.11 US(corrected) = (US/113.19)*118.21 NIP(corrected)= (NIP/120.17)*119.08 DS(corrected) = (DS/118.46)*117.33 |
Measurements: | sgpsirsE2.b1:
sgpsirsE2.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/15/2004 | 1500 | 03/31/2004 | 1200 |
Subject: | SGP/SIRS/E8 - Possible Contamination of DS PSP instrument |
DataStreams: | sgpsirsE8.00, sgpsirsE8.b1, sgpsirs20sE8.a0 |
Description: | Downwelling hemispheric shortwave values drop at about 1500 GMT under clear sky conditions, typically from about 14:00GMT to 16:00GMT. This may be due to a dirty PSP but maintenance on 03/23/04 18:11 GMT revealed no more than typical light dust. The problem was essentially undetectable by 03/31/04 12:00. The time of day that the problem exists appears to be an exagerated PSP cosine response. No obvious reason presents why the problem appeared and then disappeared within this two week period. |
Measurements: | sgpsirsE8.00:
sgpsirs20sE8.a0:
sgpsirsE8.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/02/2004 | 1734 | 06/15/2004 | 2010 |
Subject: | SGP/BRS/C1 - NIP sensor failure |
DataStreams: | sgpbrsC1.00, sgpbrsC1.b1, sgpbrs20sC1.a0 |
Description: | Normal incidence values of downwelling shortwave radiation were reported as -9999 (missing). The NIP instrument was damaged by lightning in the area near the time of failure. |
Measurements: | sgpbrs20sC1.a0:
sgpbrsC1.00:
sgpbrsC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/20/2004 | 1825 | 06/29/2004 | 1915 |
Subject: | SGP/SIRS/E7 - Reprocessed: Corrected downwelling longwave calibrations |
DataStreams: | sgpsirsE7.00, sgpsirsE7.b1 |
Description: | While attempting to correct calibration coefficients (see D040831.2) a new datalogger program was loaded which applied the wrong serial number and calibration coefficients to the downwelling longwave measurement. The data were reprocessed in September 2006 with the correct downwelling longwave calibrations and archived on 20061003. |
Measurements: | sgpsirsE7.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/10/2004 | 2050 | 04/20/2004 | 2015 |
Subject: | SGP/SIRS/E1 - Reprocess: Incorrect shortwave radiometer calibration coefficients |
DataStreams: | sgpsirsE1.00, sgpsirsE1.b1 |
Description: | During the pyrgeometer instrument (PIR) changout 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 each one minute irradiance value perform the following calculations by instrument: DD(corrected) = (DD/107.24)*109.01 US(corrected) = (US/113.19)*111.47 NIP(corrected)= (NIP/120.17)*114.82 DS(corrected) = (DS/118.46)*116.51 |
Measurements: | sgpsirsE1.b1:
sgpsirsE1.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/20/2004 | 1845 | 04/20/2004 | 1825 |
Subject: | SGP/SIRS/E7 - Reprocess: Incorrect shortwave radiometer calibration coefficients |
DataStreams: | sgpsirsE7.00, sgpsirsE7.b1 |
Description: | During the pyrgeometer instrument (PIR) changout 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 each one minute irradiance value perform the following calculations by instrument: DD(corrected) = (DD/107.24)*108.50 US(corrected) = (US/113.19)*110.10 NIP(corrected)= (NIP/120.17)*122.26 DS(corrected) = (DS/118.46)*122.56 |
Measurements: | sgpsirsE7.b1:
sgpsirsE7.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/10/2004 | 1825 | 04/20/2004 | 1825 |
Subject: | SGP/SIRS/E8 - Reprocess: Incorrect shortwave radiometer calibration coefficients |
DataStreams: | sgpsirsE8.00, sgpsirsE8.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 each one minute irradiance value perform the following calculations by instrument: DD(corrected) = (DD/107.24)*116.37 US(corrected) = (US/113.19)*121.78 NIP(corrected)= (NIP/120.17)*122.47 DS(corrected) = (DS/118.46)*122.34 |
Measurements: | sgpsirsE8.00:
sgpsirsE8.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/17/2004 | 1741 | 05/05/2004 | 0000 |
Subject: | SGP/SIRS/E11 - Reprocess: Incorrect shortwave radiometer calibration coefficients |
DataStreams: | sgpsirsE11.00, sgpsirsE11.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) Field tech reports the datalogger program was corrected on 4/27/04. Archive data review shows this was not the case and the corrected datalogger program was uploaded sometime late day 5/4/04. The end date for this DQR was chosen to be 5/5/04 0000 the first full day of the correct datalogger program. Recalculate irradiances by determining original mV signal and reapplying the correct calibration coefficients. For each one minute irradiance value perform the following calculations by instrument: DD(corrected) = (DD/107.24)*123.27 US(corrected) = (US/113.19)*127.75 NIP(corrected)= (NIP/120.17)*126.69 DS(corrected) = (DS/118.46)*126.56 |
Measurements: | sgpsirsE11.b1:
sgpsirsE11.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/18/2003 | 0000 | 12/17/2004 | 2030 |
Subject: | SGP/BRS/C1 - low downwelling shortwave readings |
DataStreams: | sgpbrsC1.00, sgpbrsC1.b1, sgpbrs20sC1.a0 |
Description: | Downwelling shortwave (DS) values frequently drop below -10 W/m^2 at night, and are consistently 20-40 W/m^2 less than the calculated downwelling shortwave during the day in clear-sky conditions. Corrective maintenance on 12/17/2004 corrected this offset. It is not clear which CM action corrected the problem since the DS instrument cable was grounded to a new location and the DS ventilator fan was found in poor condition and was replaced. Either of these issues could have led to the problem observed in this instrument. |
Measurements: | sgpbrs20sC1.a0:
sgpbrsC1.00:
sgpbrsC1.b1:
|