| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D040126.3 | SGP/SIRS/E21 - False signal | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
| D040205.1 | SGP/SIRS/E1/E2/E3/E5/E8 - Snow on Radiometers | sgpsirs20sE1.a0, sgpsirs20sE2.a0, sgpsirs20sE3.a0, sgpsirs20sE5.a0, sgpsirs20sE8.a0, sgpsirsE1.00, sgpsirsE1.b1, sgpsirsE2.00, sgpsirsE2.b1, sgpsirsE3.00, sgpsirsE3.b1, sgpsirsE5.00, sgpsirsE5.b1, sgpsirsE8.00, sgpsirsE8.b1 |
| D040226.1 | SGP/SIRS/E9 - PSP dome contamination | sgpsirs20sE9.a0, sgpsirsE9.00, sgpsirsE9.b1 |
| D040226.2 | SGP/SIRS/E11 - PSP dome contamination | sgpsirs20sE11.a0, sgpsirsE11.00, sgpsirsE11.b1 |
| D040227.2 | SGP/SIRS/E16 - Tracker Misaligned | sgpsirs20sE16.a0, sgpsirsE16.b1 |
| D040227.4 | SGP/SIRS/E15 - PSP dome contamination | sgpsirs20sE15.a0, sgpsirsE15.b1 |
| D040229.2 | SGP/SIRS/E21 - Shadowband Misalignment | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
| D040303.1 | SGP/SIRS/E16 - PSP Dome Contamination | sgpsirs20sE16.a0, sgpsirsE16.b1 |
| D040320.1 | SGP/SIRS/E5 - anomalously low NIP readings | sgpsirs20sE5.a0, sgpsirsE5.00, sgpsirsE5.b1 |
| D040320.2 | SGP/SIRS/E8 - Possible Contamination of DS PSP instrument | sgpsirs20sE8.a0, sgpsirsE8.00, sgpsirsE8.b1 |
| D040322.1 | SGP/SIRS/C1 - Discrepancy between measured and derived downwelling shortwave hemispheric | sgpsirs20sC1.a0, sgpsirsC1.b1 |
| D040329.1 | SGP/SIRS/E21 - Instrument logger time problem, Unknown | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
| D040405.2 | SGP/SIRS/E7 - PSP dome contamination | sgpsirs20sE7.a0, sgpsirsE7.b1 |
| D040420.2 | SGP/SIRS/E5 - Dirt on PSP Dome | sgpsirs20sE5.a0, sgpsirsE5.00, sgpsirsE5.b1 |
| D040420.4 | SGP/SIRS/E27 - incorrect tracking | sgpsirs20sE27.a0, sgpsirsE27.00, sgpsirsE27.b1 |
| D040601.1 | SGP/SIRS/E21 - Dirt on dome | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
| D040608.3 | SGP/SIRS/E15 - NIP cable failure results in missing data | sgpsirs20sE15.a0, sgpsirsE15.00, sgpsirsE15.b1 |
| D040615.5 | SGP/SIRS/E12 - Incorrect Times | sgp15swfanalsirs1longE12.c1, sgp1swfanalsirs1longE12.c1, sgpsirs20sE12.a0, sgpsirsE12.00, sgpsirsE12.b1 |
| D040706.1 | SGP/SIRS/E22 - Failed NIP sensor cable | sgpsirs20sE22.a0, sgpsirsE22.00, sgpsirsE22.b1 |
| D040712.3 | SGP/SIRS/E24 - NIP shaded near sunrise | sgpsirs20sE24.a0, sgpsirsE24.b1 |
| D040907.1 | SGP/SIRS/C1/E13 - Incorrect calibration coefficients | sgpsirs20sC1.a0, sgpsirs20sE13.a0, sgpsirsC1.00, sgpsirsC1.b1, sgpsirsE13.00, sgpsirsE13.b1 |
| D041206.1 | SGP/SIRS/E10 - tracker failure | sgpsirs20sE10.a0, sgpsirsE10.00, sgpsirsE10.b1 |
| D050109.3 | SGP/SIRS/E12 - Ice obscured NIP | sgpsirs20sE12.a0, sgpsirsE12.00, sgpsirsE12.b1 |
| D050114.5 | SGP/SIRS/E15 - Failed NIP cable | sgpsirs20sE15.a0, sgpsirsE15.00, sgpsirsE15.b1 |
| D050117.1 | SGP/SIRS/E9 - Unknown -failed PSP ventilator fan | sgpsirs20sE9.a0, sgpsirsE9.00, sgpsirsE9.b1 |
| D050131.22 | SGP/SIRS/E11 - Ice storm | sgpsirs20sE11.a0, sgpsirsE11.b1 |
| D050131.23 | SGP/SIRS/E15 - Ice storm | sgpsirs20sE15.a0, sgpsirsE15.b1 |
| D050131.24 | SGP/SIRS/E16 - Ice storm | sgpsirs20sE16.a0, sgpsirsE16.b1 |
| D050131.25 | SGP/SIRS/E2 - Ice storm | sgpsirs20sE2.a0, sgpsirsE2.b1 |
| D050131.26 | SGP/SIRS/E5 - Ice storm | sgpsirs20sE5.a0, sgpsirsE5.b1 |
| D050131.27 | SGP/SIRS/E6 - Ice storm | sgpsirs20sE6.a0, sgpsirsE6.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 |
| D050205.2 | SGP/SIRS/E6 - Questionable data due to Ice Storm damage | sgpsirs20sE6.a0, sgpsirsE6.00, sgpsirsE6.b1 |
| D050205.3 | SGP/SIRS/E2 - Tracker mis-alignment | sgpsirs20sE2.a0, sgpsirsE2.00, sgpsirsE2.b1 |
| D050205.4 | SGP/SIRS/E18 - Possible PSP dome contamination | sgpsirs20sE18.a0, sgpsirsE18.00, sgpsirsE18.b1 |
| D050227.1 | SGP/SIRS/E24 - Erratic downwelling shortwave data | sgpsirs20sE24.a0, sgpsirsE24.00, sgpsirsE24.b1 |
| D050303.1 | SGP/SIRS/E2 - Reprocessed: Incorrect DIR calibration coefficients | sgpsirs20sE2.a0, sgpsirsE2.00, sgpsirsE2.b1 |
| D050412.3 | SGP/SIRS/E24 - Dirt on dome | sgpsirs20sE24.a0, sgpsirsE24.00, sgpsirsE24.b1 |
| D050414.2 | SGP/SIRS/E9 - Downwelling Shortwave values low | sgpsirs20sE9.a0, sgpsirsE9.00, sgpsirsE9.b1 |
| D050429.1 | SGP/SIRS/E12 - Reprocess: Incorrect calibrations | sgpsirs20sE12.a0, sgpsirsE12.00, sgpsirsE12.b1 |
| D050520.1 | SGP/SIRS/E22 - Intermittent upwelling longwave data loss | sgpsirs20sE22.a0, sgpsirsE22.00, sgpsirsE22.b1 |
| D050601.1 | SGP/SIRS/E13 - Reprocess: incorrect calibrations | sgpsirs20sE13.a0, sgpsirsE13.00, sgpsirsE13.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 |
| D050726.1 | SGP/SIRS/E4 - Dirt on Dome | sgpsirs20sE4.a0, sgpsirsE4.00, sgpsirsE4.b1 |
| D050801.1 | SGP/SIRS/E8 - Downwelling Shortwave hemispheric (PSP) Dome Contamination | sgpsirs20sE8.a0, sgpsirsE8.00, sgpsirsE8.b1 |
| D050810.3 | SGP/SIRS/E20 - Downwelling Shortwave PSP Damaged by Lightning | sgpsirs20sE20.a0, sgpsirsE20.00, sgpsirsE20.b1 |
| D050929.1 | SGP/SIRS/C1 - sun tracker power failure | sgpsirs20sC1.a0, sgpsirsC1.00, sgpsirsC1.b1 |
| D051117.1 | SGP/SIRS/E24 - Reprocess: Incorrect calibration coefficients | sgpsirs20sE24.a0, sgpsirsE24.00, sgpsirsE24.b1 |
| D060331.2 | SGP/SIRS/E1 - Intermittantly missing downwelling diffuse | sgpsirs20sE1.a0, sgpsirsE1.00, sgpsirsE1.b1 |
| D060403.1 | SGP/SIRS/E11 - failed ventilator fan | sgpsirs20sE11.a0, sgpsirsE11.00, sgpsirsE11.b1 |
| D060403.3 | SGP/SIRS/E19 - Ventilator failure | sgpsirs20sE19.a0, sgpsirsE19.00, sgpsirsE19.b1 |
| D060403.4 | SGP/SIRS/E20 - Instrument noise problem | sgpsirs20sE20.a0, sgpsirsE20.00, sgpsirsE20.b1 |
| D060405.1 | SGP/SIRS/E24 - Reprocess: Incorrect calibration coefficients | sgpsirs20sE24.a0, sgpsirsE24.00, sgpsirsE24.b1 |
| D060424.1 | SGP/SIRS/E21 - Roosting birds in field of view | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
| D060508.1 | SGP/SIRS/E16 - NIP Instrument Failure | sgpsirs20sE16.a0, sgpsirsE16.b1 |
| D060523.1 | SGP/SIRS/E8 - Instrument cable problem | sgpsirs20sE8.a0, sgpsirsE8.b1 |
| D060703.1 | SGP/SIRS/E3 - Reprocess: Wrong Calibration Coefficients | sgpsirs20sE3.a0, sgpsirsE3.b1 |
| D060718.2 | SGP/SIRS/E9 - Tracker Failure | sgpsirs20sE9.a0, sgpsirsE9.00, sgpsirsE9.b1 |
| D061115.2 | SGP/SIRS/E18 - Upwelling SW cable severed | sgpsirs20sE18.a0, sgpsirsE18.00, sgpsirsE18.b1 |
| D061121.2 | SGP/SIRS/C1 - Upwelling SW cable problem | sgpsirs20sC1.a0, sgpsirsC1.00, sgpsirsC1.b1 |
| D061205.2 | SGP/SIRS/E24 - Spikes in data | sgpsirs20sE24.a0, sgpsirsE24.b1 |
| D061208.1 | SGP/SIRS/E7 - Instrument noise | sgpsirs20sE7.a0, sgpsirsE7.b1 |
| D070306.1 | SGP/SIRS/C1 - Reprocess: Incorrect calibration coefficients | sgpsirs20sC1.a0, sgpsirsC1.00, sgpsirsC1.b1 |
| D070320.1 | SGP/SIRS/E22 - Reprocess: Incorrect calibration coefficients | sgpsirs20sE22.a0, sgpsirsE22.00, sgpsirsE22.b1 |
| D070411.1 | SGP/SIRS/E3 - Instrument leveling and tracker problem | sgpsirs20sE3.a0, sgpsirsE3.b1 |
| D080610.1 | SGP/SIRS/E20 - Missing data | sgpsirs20sE20.a0, sgpsirsE20.b1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/19/2003 | 0000 | 02/26/2004 | 2359 |
| Subject: | SGP/SIRS/E21 - False signal |
| DataStreams: | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
| Description: | During clear-sky conditions, downwelling shortwave values spike downward approximately 50 to 200 W/m^2 around 22:15 UTC for about 15 minutes. This problem occurs at about the same time for the same duration each day during the indicated period of the year. This effect is due to a shadow from the Rotating Bird Deterrent (RBD) installed earlier in the year to prevent extensive bird droppings at the site. The RBD is installed at such a location that it will partially shade the downwelling shortwave PSP from 19 October to 23 February of the year. |
| Measurements: | sgpsirsE21.00:
sgpsirs20sE21.a0:
sgpsirsE21.b1:
|
| 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: | sgpsirs20sE1.a0, sgpsirs20sE2.a0, sgpsirs20sE3.a0, sgpsirs20sE5.a0, sgpsirs20sE8.a0, sgpsirsE1.00, sgpsirsE1.b1, sgpsirsE2.00, sgpsirsE2.b1, sgpsirsE3.00, sgpsirsE3.b1, sgpsirsE5.00, sgpsirsE5.b1, sgpsirsE8.00, sgpsirsE8.b1 |
| 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 | 1600 | 02/23/2004 | 0500 |
| Subject: | SGP/SIRS/E9 - PSP dome contamination |
| DataStreams: | sgpsirs20sE9.a0, sgpsirsE9.00, sgpsirsE9.b1 |
| 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 | 1500 | 03/01/2004 | 1300 |
| Subject: | SGP/SIRS/E11 - PSP dome contamination |
| DataStreams: | sgpsirs20sE11.a0, sgpsirsE11.00, sgpsirsE11.b1 |
| 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 |
|---|---|---|---|
| 02/06/2004 | 2200 | 02/18/2004 | 1605 |
| Subject: | SGP/SIRS/E16 - Tracker Misaligned |
| DataStreams: | sgpsirs20sE16.a0, sgpsirsE16.b1 |
| Description: | Direct Normal Shortwave (NIP) values may be reduced by tracker misalignment (tracker clock slow by 2 minutes 10 sec on 2/18/04). Downwelling Diffuse (DD) values may be increased by the tracker misalignment. Error amounts can not be accurately quantified. |
| Measurements: | sgpsirsE16.b1:
sgpsirs20sE16.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/20/2004 | 1900 | 02/29/2004 | 1700 |
| Subject: | SGP/SIRS/E15 - PSP dome contamination |
| DataStreams: | sgpsirs20sE15.a0, sgpsirsE15.b1 |
| Description: | PSP dome was dirty. Afternoon values of downwelling shortwave radiation were less than derived values by about 50 W/m^2. PSP values compare well to derived PSP values after precip event on 02/29/04 1300-1600 GMT. Maintenance on 03/02 1713 GMT revealed no unusual contamination. Precip on 02/29 likely effectively cleaned the PSP dome. |
| Measurements: | sgpsirsE15.b1:
sgpsirs20sE15.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/20/2004 | 1300 | 03/03/2004 | 1300 |
| Subject: | SGP/SIRS/E21 - Shadowband Misalignment |
| DataStreams: | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
| Description: | The NIP reported values close to zero and downwelling shortwave global and diffuse were equivalent due to tracker failure. Maintenance replaced tracker 2/27, but couldn't replace instruments until 03/02 2000 GMT due to bird poop contamination. |
| Measurements: | sgpsirsE21.00:
sgpsirs20sE21.a0:
sgpsirsE21.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/06/2004 | 2200 | 02/18/2004 | 1605 |
| Subject: | SGP/SIRS/E16 - PSP Dome Contamination |
| DataStreams: | sgpsirs20sE16.a0, sgpsirsE16.b1 |
| Description: | Downwelling Shortwave (DS) values near 22:00 GMT during clear skys are lower than expected due to contamination of pyranometer dome. A dime-sized spot of dirt was found on the southwest portion of the pyranometer dome. DS values for cloudy conditions during this period are also suspect, but the amount of irradiance reduction are not significant. |
| Measurements: | sgpsirsE16.b1:
sgpsirs20sE16.a0:
|
| 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: | sgpsirs20sE5.a0, sgpsirsE5.00, sgpsirsE5.b1 |
| 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.b1:
sgpsirs20sE5.a0:
sgpsirsE5.00:
|
| 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: | sgpsirs20sE8.a0, sgpsirsE8.00, sgpsirsE8.b1 |
| 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 |
|---|---|---|---|
| 03/18/2004 | 1500 | 06/10/2004 | 2000 |
| Subject: | SGP/SIRS/C1 - Discrepancy between measured and derived downwelling shortwave hemispheric |
| DataStreams: | sgpsirs20sC1.a0, sgpsirsC1.b1 |
| Description: | Measured values of downwelling hemispheric shortwave radiation were up to 40 W/m^2 higher than derived values during the afternoon hours. Analysis reveals that this is likely an artifact of the cosine response of the particular installed PSP coupled with typical uncertainties of this set of installed radiometers. That is, this particular instrument cluster seems to be producing cumulative errors on the high side of accepted values. The PSP contains the most uncertainty in measurement at this station. Users should use a derived value for the downwelling shortwave hemispheric irradiance (DS). Where DS = diffuse component + direct normal * cos(SZA) component described in the SIRS handbook Sec 7.2 available at: http://www.arm.gov/publications/tech_reports/handbooks/sirs_handbook.pdf |
| Measurements: | sgpsirsC1.b1:
sgpsirs20sC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/21/2004 | 1200 | 03/24/2004 | 0200 |
| Subject: | SGP/SIRS/E21 - Instrument logger time problem, Unknown |
| DataStreams: | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
| Description: | Values of diffuse hemispheric shortwave radiation differ from derived values by at most 70 Wm^(-2). The incident appears to be isolated to 3/21, 3/22, and 3/23. An estimation of solar noon using downwelling shortwave hemispheric irradiance from the PSP shows solar noon to oocur at around 1845GMT on 3/21. Calculated solar noon occurs at E21 at 1831GMT for 3/21/2004. There appears to be a time discrepancy in the datalogger for these dates. 04/01 is the next date with enough sun to determine solar noon and compare to calculated. The data from this date appears correct. Ronald Reed [rreed@ops.sgp.arm.gov] reports the logger did not receive any reportable time updates during the late March time period. We don't know what happened during these three dates but from 3/24 on data looks acceptable. |
| Measurements: | sgpsirsE21.00:
sgpsirs20sE21.a0:
sgpsirsE21.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/30/2004 | 1430 | 04/06/2004 | 2100 |
| Subject: | SGP/SIRS/E7 - PSP dome contamination |
| DataStreams: | sgpsirs20sE7.a0, sgpsirsE7.b1 |
| Description: | Values of hemispheric downwelling shortwave radiation differed from derived values by 45 W/m^2 on 03/30 around 1430 GMT under clear sky conditions due to dirt on the dome. Maintenance reported cleaning heavy dust from dome on 04/06 2030 GMT. |
| Measurements: | sgpsirs20sE7.a0:
sgpsirsE7.b1:
|
| 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: | sgpsirs20sE5.a0, sgpsirsE5.00, sgpsirsE5.b1 |
| 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.b1:
sgpsirs20sE5.a0:
sgpsirsE5.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/14/2004 | 1700 | 09/15/2004 | 1650 |
| 10/27/2004 | 1500 | 11/05/2004 | 1900 |
| Subject: | SGP/SIRS/E27 - incorrect tracking |
| DataStreams: | sgpsirs20sE27.a0, sgpsirsE27.00, sgpsirsE27.b1 |
| Description: | The solar tracker at E27 was not functioning properly. The problem affected tracker mounted instruments: downwelling diffuse 8-48 and direct normal pyrheliometer NIP. After tracker adjustment on 4/14/2004 1700GMT the tracker stopped tracking properly during afternoon hours. Attempts to correct tracker operation throughout the failure period resulted in variations on incorrect tracker operation. No replacement tracker was available. After adjustment on 9/15/2004 the tracker problem was resolved. It is unclear what, other than typical az and zen tracker software changes by field techs, corrected the problem. This problem period corresponds to the first time range specified (4/14 to 9/15). On 10/27/2004 a replacement tracker was installed at E27. Technical difficulties kept tracker out of service until 11/05/2004. The replacement tracker at E27 was put into serice by the field techs on 11/05/2004 1830GMT. The tracker has been tracking correctly since this time. This problem period corresponds to the second time range (10/27 to 11/05). |
| Measurements: | sgpsirsE27.00:
sgpsirsE27.b1:
sgpsirs20sE27.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/28/2004 | 1500 | 06/09/2004 | 1342 |
| Subject: | SGP/SIRS/E21 - Dirt on dome |
| DataStreams: | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
| Description: | Measured downwelling shortwave values differed from calculated
(direct + diffuse) by +/-100 W/m^2 in the afternoon. Pattern of
differences is indicative of a dirty downwelling shortwave dome.
Maintenance on 6/9 cleaned water spots on the dome. Other
downwelling instruments may have also been dirty during this
period. |
| Measurements: | sgpsirsE21.00:
sgpsirs20sE21.a0:
sgpsirsE21.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/03/2004 | 1122 | 06/08/2004 | 1700 |
| Subject: | SGP/SIRS/E15 - NIP cable failure results in missing data |
| DataStreams: | sgpsirs20sE15.a0, sgpsirsE15.00, sgpsirsE15.b1 |
| Description: | The NIP began reporting -9999 (missing) for all direct normal
downwelling shortwave radiation. Maintenance 6/8 revealed a
broken cable. Cable was repaired and NIP data returned to normal. |
| Measurements: | sgpsirsE15.00:
sgpsirsE15.b1:
sgpsirs20sE15.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/19/2004 | 2212 | 03/10/2004 | 2247 |
| Subject: | SGP/SIRS/E12 - Incorrect Times |
| DataStreams: | sgp15swfanalsirs1longE12.c1, sgp1swfanalsirs1longE12.c1, sgpsirs20sE12.a0, sgpsirsE12.00, sgpsirsE12.b1 |
| Description: | The ntpd server (time adjustment) stopped working on Feb. 19th at 22:12:16 GMT, and the clock was corrected by -5600.177269 seconds on March 10th at 22:47 GMT. The recorded times for observations are off by amounts ranging from 0 seconds on Feb. 19th to 5600 seconds on March 10th. |
| Measurements: | sgp1swfanalsirs1longE12.c1:
sgpsirsE12.b1:
sgp15swfanalsirs1longE12.c1:
sgpsirs20sE12.a0:
sgpsirsE12.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/30/2004 | 0156 | 07/07/2004 | 1800 |
| Subject: | SGP/SIRS/E22 - Failed NIP sensor cable |
| DataStreams: | sgpsirs20sE22.a0, sgpsirsE22.00, sgpsirsE22.b1 |
| Description: | The suntracker was driven past it optical limit switch and pulled the direct normal (NIP) instrument cable from its connector. |
| Measurements: | sgpsirs20sE22.a0:
sgpsirsE22.b1:
sgpsirsE22.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/17/2003 | 1200 | 05/20/2003 | 1300 |
| 07/26/2003 | 1300 | 09/06/2003 | 1200 |
| 04/08/2004 | 1200 | 05/20/2004 | 1300 |
| 07/26/2004 | 1300 | 09/06/2004 | 1200 |
| Subject: | SGP/SIRS/E24 - NIP shaded near sunrise |
| DataStreams: | sgpsirs20sE24.a0, sgpsirsE24.b1 |
| Description: | The NIP is shaded by the EF laptop computer enclosure near sunrise during parts of the Spring and Summer. This has occurred from 04/08 to 05/20 and from 07/26 to 09/06 every year since 2001 and will occur during these date ranges in the future as well. The shading occurs for a few minutes each day between 1200 and 1300 GMT depending on the time of the year. For the early dates, shading occurs a little after 1200 GMT and by 05/20 shading happens nearer to 1300 GMT. In late July the shading occurs near 1300 GMT and closer to 1200 GMT by 09/06. |
| Measurements: | sgpsirs20sE24.a0:
sgpsirsE24.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/27/2004 | 1830 | 09/07/2004 | 2130 |
| Subject: | SGP/SIRS/C1/E13 - Incorrect calibration coefficients |
| DataStreams: | sgpsirs20sC1.a0, sgpsirs20sE13.a0, sgpsirsC1.00, sgpsirsC1.b1, sgpsirsE13.00, sgpsirsE13.b1 |
| Description: | After the DIR changeout on 8/27, the DLH measurements at the central facility vary significantly between pyrgeometers by as much as 65 Wm^(-2). It was discovered that the two downwelling pyrgeometers destined for C1 and E13 may have been swapped during installation. The instrument mentor is unsure of applied calibration coefficients during this DQR's time period. Backing out new downwelling longwave irradiances would be difficult in this case. Fortunately, the problem period is less than a fortnight. |
| Measurements: | sgpsirsE13.b1:
sgpsirsC1.b1:
sgpsirsC1.00:
sgpsirs20sE13.a0:
sgpsirs20sC1.a0:
sgpsirsE13.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/04/2004 | 1800 | 01/26/2005 | 1600 |
| Subject: | SGP/SIRS/E10 - tracker failure |
| DataStreams: | sgpsirs20sE10.a0, sgpsirsE10.00, sgpsirsE10.b1 |
| 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 |
|---|---|---|---|
| 01/06/2005 | 0000 | 01/07/2005 | 2359 |
| Subject: | SGP/SIRS/E12 - Ice obscured NIP |
| DataStreams: | sgpsirs20sE12.a0, sgpsirsE12.00, sgpsirsE12.b1 |
| Description: | During the morning hours of 01/06, the direct normal shortwave readings are anomalously low in clear sky conditions, causing very large differences (approaching/exceeding 300 W/m^2) between the downwelling shortwave hemispheric (DSH) readings and the derived downwelling shortwave hemispheric readings. It would appear the NIP window had iced over during the previous days storm. The NIP window appears to have cleared itself by the morning of 2005/01/08. |
| Measurements: | sgpsirsE12.b1:
sgpsirs20sE12.a0:
sgpsirsE12.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/09/2005 | 0849 | 01/18/2005 | 1900 |
| Subject: | SGP/SIRS/E15 - Failed NIP cable |
| DataStreams: | sgpsirs20sE15.a0, sgpsirsE15.00, sgpsirsE15.b1 |
| Description: | After the ice storm, the SHORT_DIRECT_NORMAL values were bad or
missing continuously. Corrective Maintenance on 01/18 found
the NIP cable had broken inside the Bendix connector. The NIP
cable was repaired and returned to service. |
| Measurements: | sgpsirsE15.00:
sgpsirsE15.b1:
sgpsirs20sE15.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: | 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 |
|---|---|---|---|
| 01/05/2005 | 0602 | 01/11/2005 | 1423 |
| Subject: | SGP/SIRS/E11 - Ice storm |
| DataStreams: | sgpsirs20sE11.a0, sgpsirsE11.b1 |
| Description: | Data missing due to ice storm. |
| Measurements: | sgpsirsE11.b1:
sgpsirs20sE11.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/05/2005 | 0202 | 01/09/2005 | 0848 |
| Subject: | SGP/SIRS/E15 - Ice storm |
| DataStreams: | sgpsirs20sE15.a0, sgpsirsE15.b1 |
| Description: | Data missing due to an ice storm. |
| Measurements: | sgpsirsE15.b1:
sgpsirs20sE15.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/05/2005 | 0602 | 01/09/2005 | 1349 |
| Subject: | SGP/SIRS/E16 - Ice storm |
| DataStreams: | sgpsirs20sE16.a0, sgpsirsE16.b1 |
| Description: | Data missing due to ice storm. |
| Measurements: | sgpsirsE16.b1:
sgpsirs20sE16.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/05/2005 | 0902 | 01/13/2005 | 1618 |
| Subject: | SGP/SIRS/E2 - Ice storm |
| DataStreams: | sgpsirs20sE2.a0, sgpsirsE2.b1 |
| Description: | Data missing due to ice storm. |
| Measurements: | sgpsirsE2.b1:
sgpsirs20sE2.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/04/2005 | 2202 | 01/12/2005 | 2002 |
| Subject: | SGP/SIRS/E5 - Ice storm |
| DataStreams: | sgpsirs20sE5.a0, sgpsirsE5.b1 |
| Description: | Data missing due to ice storm. |
| Measurements: | sgpsirsE5.b1:
sgpsirs20sE5.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/05/2005 | 0202 | 01/09/2005 | 1630 |
| Subject: | SGP/SIRS/E6 - Ice storm |
| DataStreams: | sgpsirs20sE6.a0, sgpsirsE6.b1 |
| Description: | Data missing due to ice storm. |
| Measurements: | sgpsirs20sE6.a0:
sgpsirsE6.b1:
|
| 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 |
|---|---|---|---|
| 01/13/2005 | 1200 | 02/10/2005 | 1700 |
| Subject: | SGP/SIRS/E6 - Questionable data due to Ice Storm damage |
| DataStreams: | sgpsirs20sE6.a0, sgpsirsE6.00, sgpsirsE6.b1 |
| 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: | sgpsirs20sE2.a0, sgpsirsE2.00, sgpsirsE2.b1 |
| 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 |
|---|---|---|---|
| 02/03/2005 | 1200 | 02/15/2005 | 2250 |
| Subject: | SGP/SIRS/E18 - Possible PSP dome contamination |
| DataStreams: | sgpsirs20sE18.a0, sgpsirsE18.00, sgpsirsE18.b1 |
| Description: | Downwelling shortwave hemispheric (DSH) measurements did not agree with derived DSH readings during the morning hours up to 1500GMT each clear day. PM cleaning on 2/16 2250 revealed nothing other than dirty water spots. A dirty or ice covered PSP dome may have been the cause, clearing itself before the PM crew arrived. |
| Measurements: | sgpsirs20sE18.a0:
sgpsirsE18.b1:
sgpsirsE18.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/13/2005 | 1945 | 03/17/2005 | 1745 |
| Subject: | SGP/SIRS/E24 - Erratic downwelling shortwave data |
| DataStreams: | sgpsirs20sE24.a0, sgpsirsE24.00, sgpsirsE24.b1 |
| Description: | Downwelling shortwave hemispheric readings are occasionally erratic, jumping to very high or very low values for short periods of time. SGP PM techs reseated all Downwelling Shortwave PSP instrument connections on 3/17/2005 approx 1945GMT. The problem did not reoccur after that time but the DS cable was replaced on 3/31/2005 approx 1815 GMT to ensure the problem did not reappear. |
| Measurements: | sgpsirsE24.00:
sgpsirs20sE24.a0:
sgpsirsE24.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/10/2005 | 1620 | 03/10/2005 | 1600 |
| Subject: | SGP/SIRS/E2 - Reprocessed: Incorrect DIR calibration coefficients |
| DataStreams: | sgpsirs20sE2.a0, sgpsirsE2.00, sgpsirsE2.b1 |
| Description: | During the DIR/UIR instrument changeout on 2/10/2005 the new datalogger program contained incorrect calibration coefficients for the DIR instrument. The program was corrected on 3/10/2005. These data were reprocessed and archived in September 2006. |
| Measurements: | sgpsirsE2.b1:
sgpsirsE2.00:
sgpsirs20sE2.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/07/2005 | 0000 | 04/14/2005 | 1610 |
| Subject: | SGP/SIRS/E24 - Dirt on dome |
| DataStreams: | sgpsirs20sE24.a0, sgpsirsE24.00, sgpsirsE24.b1 |
| Description: | The Downwelling Shortwave Hemispheric (DSH) Irradiance data were erratic. The Pyranometer instrument dome at this site was likely dirty given the relatively large spread between the measured DSH and derived DSH readings during the middle part of the day (up to 50 W/m^2). Rain on 04/06 most likely contributed to this problem. Preventative maintenance on 4/14 effectively cleaned the pyranometer dome. Preventative maintenance reports indicate dry-water spots on dome when it was cleaned on 4/14. |
| Measurements: | sgpsirsE24.00:
sgpsirs20sE24.a0:
sgpsirsE24.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: | 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 |
|---|---|---|---|
| 04/26/2005 | 1726 | 05/03/2005 | 1840 |
| Subject: | SGP/SIRS/E12 - Reprocess: Incorrect calibrations |
| DataStreams: | sgpsirs20sE12.a0, sgpsirsE12.00, sgpsirsE12.b1 |
| Description: | During site corrective maintenance to resolve an Extended Facility data collection problem, the SIRS.E12 datalogger was power cycled (1725 GMT). The datalogger reverted to an old SIRS program with incorrect S/Ns and calibration coefficients for all instruments at this station. The SW data can be recalibrated as follows: First divide value by incorrectly applied cal coeff (first number) then multiply by correct cal coeff (second number) down_short_diffuse_hemisp 107.27 118.68 up_short_hemisp 113.19 127.95 short_direct_normal 120.17 120.52 down_short_hemisp 118.46 102.11 The LW data were recalibrated and reprocessed as part of a larger LW calibration task. The reprocessed data were archived in October 2006. |
| Measurements: | sgpsirsE12.b1:
sgpsirs20sE12.a0:
sgpsirsE12.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/07/2005 | 0000 | 07/20/2005 | 2000 |
| Subject: | SGP/SIRS/E22 - Intermittent upwelling longwave data loss |
| DataStreams: | sgpsirs20sE22.a0, sgpsirsE22.00, sgpsirsE22.b1 |
| Description: | Upwelling longwave hemispheric data drops out occasionally during the afternoon hours. Maintenance determined that the Upwelling LW Hemispheric irradiance instrument, the PIR, had a failed cable affecting only the thermopile measurement of this instrument. Cable was replaced 7/20/05 2000GMT. |
| Measurements: | sgpsirs20sE22.a0:
sgpsirsE22.b1:
sgpsirsE22.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/25/2005 | 1409 | 06/02/2005 | 2205 |
| Subject: | SGP/SIRS/E13 - Reprocess: incorrect calibrations |
| DataStreams: | sgpsirs20sE13.a0, sgpsirsE13.00, sgpsirsE13.b1 |
| Description: | After a long data gap on 5/25/2005, presumably a power outage, the following datastreams
were showing incorrect values as well as incorrect calibration coefficients in the
datalogger program:
down_long_hemisp_shaded (downwelling PIR instrument)
up_long_hemisp (upwelling PIR instrument)
short_direct_normal (NIP instrument)
The SIRS.E13 datalogger was power cycled (6/2/2005 2200GMT) and the correct program loaded
into the SIRS datalogger and storage module.
The data during this time range can be recalibrated as follows:
First divide value by incorrectly applied cal coeff (first number) then multiply by
correct cal coeff (second number)
short_direct_normal 120.28 124.58
up_long_netir 0.2386 0.2595
down_long_netir 0.3052 0.2304
Reapply cal coeffs below using up_long_netIR(uV), inst_up_long_dome_temp(K),
inst_up_long_dome_temp(K) using procedure described in SIRS instrument manual.
up_long_hemisp
k0 -18.3400 W/m^2\n,
k1 0.2595 W/(m^2*uV)\n,
k2 1.0380 unitless\n,
k3 -2.7420 unitless\n,
kr 0.0007044 K/uV\n,
Reapply cal coeffs below using down_long_netIR(uV),inst_down_long_dome_temp
(K),inst_down_long_dome_temp(K).
down_long_hemisp_shaded
k0 -11.6300 W/m^2\n,
k1 0.2304 W/(m^2*uV)\n,
k2 1.0190 unitless\n,
k3 -2.4230 unitless\n,
kr 0.0007044 K/uV\n, |
| Measurements: | sgpsirsE13.b1:
sgpsirs20sE13.a0:
sgpsirsE13.00:
|
| 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 |
|---|---|---|---|
| 07/16/2005 | 1412 | 07/27/2005 | 1600 |
| Subject: | SGP/SIRS/E4 - Dirt on Dome |
| DataStreams: | sgpsirs20sE4.a0, sgpsirsE4.00, sgpsirsE4.b1 |
| 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:
sgpsirsE4.b1:
sgpsirs20sE4.a0:
|
| 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 |
|---|---|---|---|
| 08/04/2005 | 2207 | 08/17/2005 | 1840 |
| Subject: | SGP/SIRS/E20 - Downwelling Shortwave PSP Damaged by Lightning |
| DataStreams: | sgpsirs20sE20.a0, sgpsirsE20.00, sgpsirsE20.b1 |
| Description: | The PSP was damaged by a lightning strike on 8/04/05 (22:10 GMT). Data from other
radiometers are good after this event.
The PSP, NIP and shaded 8-48 were replaced 8/17/05 and the system returned to service at
18:40 GMT.
Downwelling Shortwave (DS) data from the unshaded PSP during this period is reported as
0.0 W/sq m. The DS can be computed from available Direct Normal (NIP), Downwelling Diffuse
(DD), and the computed Solar Zenith Angle (SZA) using the following equation:
DS = NIP * Cos(SZA) + DD
Estimated uncertainties of the computed values are actually lower than those of the
measured DS (+/- 3% or 4% vs. +/- 5% to 10% respectively, depending on SZA). |
| Measurements: | sgpsirsE20.b1:
sgpsirs20sE20.a0:
sgpsirsE20.00:
|
| 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 |
|---|---|---|---|
| 08/18/2005 | 1415 | 11/23/2005 | 1706 |
| Subject: | SGP/SIRS/E24 - Reprocess: Incorrect calibration coefficients |
| DataStreams: | sgpsirs20sE24.a0, sgpsirsE24.00, sgpsirsE24.b1 |
| Description: | Calibration coefficient for the downwelling diffuse measurement (8-48 B&W Eppley instrument) was incorrect after the instrument replacement 8/18/2005. Affected downwelling diffuse irradiance data can be corrected: Irr(corr) = Irr(uncorr) / 122.85 * 112.85 (or a overall multiplier of .9186) |
| Measurements: | sgpsirsE24.00:
sgpsirs20sE24.a0:
sgpsirsE24.b1:
|
| 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 |
|---|---|---|---|
| 10/01/2005 | 0000 | 04/04/2006 | 1545 |
| Subject: | SGP/SIRS/E11 - failed ventilator fan |
| DataStreams: | sgpsirs20sE11.a0, sgpsirsE11.00, sgpsirsE11.b1 |
| Description: | E11 downwelling hemispheric shortwave instrument (Eppley PSP) has shown larger and larger nighttime offsets (from -5 to -10 W/m2) since October. A failed ventilator fan was discovered during PM and replaced on 4/4/2006. |
| Measurements: | sgpsirsE11.b1:
sgpsirsE11.00:
sgpsirs20sE11.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/11/2006 | 0000 | 04/13/2006 | 1522 |
| Subject: | SGP/SIRS/E19 - Ventilator failure |
| DataStreams: | sgpsirs20sE19.a0, sgpsirsE19.00, sgpsirsE19.b1 |
| Description: | Dowenlling shortwave hemispheric instrument signal (Eppley PSP) is very erratic due to failed ventilator fan which was replaced during PM on 04/13/2006. |
| Measurements: | sgpsirsE19.b1:
sgpsirs20sE19.a0:
sgpsirsE19.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/20/2005 | 1930 | 04/12/2006 | 2040 |
| Subject: | SGP/SIRS/E20 - Instrument noise problem |
| DataStreams: | sgpsirs20sE20.a0, sgpsirsE20.00, sgpsirsE20.b1 |
| Description: | Afer recovery from lightening strike the upwelling longwave SIRS Eppley PIR (UIR) has had noise on both dome and case thermistor measurements. On 4/12/2006 techs replaced defective j-panel at base of tower. |
| Measurements: | sgpsirsE20.b1:
sgpsirs20sE20.a0:
sgpsirsE20.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/16/2006 | 1705 | 04/13/2006 | 1715 |
| Subject: | SGP/SIRS/E24 - Reprocess: Incorrect calibration coefficients |
| DataStreams: | sgpsirs20sE24.a0, sgpsirsE24.00, sgpsirsE24.b1 |
| Description: | During the PIR coefficient change from 4/coeffs to 1/coeff, the downwelling diffuse hemispheric instrument (Eppley 8-48) coefficient was inadvertently changed to 122.85 and should have been 112.85 W/m2/mV. Perform the following calculation to correct the data, DD=downwelling diffuse instrument: DD(new)[W/m2]=( DD(old)[W/m2]/122.85[W/m2\mV] )* 112.85[W/m2/mV] |
| Measurements: | sgpsirsE24.00:
sgpsirs20sE24.a0:
sgpsirsE24.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/07/2006 | 1200 | 05/31/2006 | 1700 |
| Subject: | SGP/SIRS/E21 - Roosting birds in field of view |
| DataStreams: | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
| Description: | The RBDD (Rotating Bird Deterrent Device) installed at E21 to prevent turkey vultures from roosting on the instrument boom failed resulting in noisy NIP (Short Direct Normal) and PSP (Short Global Hemispheric) data and a spike occurring around 2230 UTC everyday due to obstruction of the field of view. Problem is intermittant due to moving birds. Use data with discretion. Follow ARM (DQMS3) flag recommendations for QC flags 02 or 03 found in section 5.1.4 of the SIRS handbook: http://www.arm.gov/publications/tech_reports/handbooks/sirs_handbook.pdf |
| Measurements: | sgpsirsE21.00:
sgpsirs20sE21.a0:
sgpsirsE21.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/28/2006 | 1543 | 05/12/2006 | 1608 |
| Subject: | SGP/SIRS/E16 - NIP Instrument Failure |
| DataStreams: | sgpsirs20sE16.a0, sgpsirsE16.b1 |
| Description: | The short_direct_normal dropped below MIN value on 4/28/06 resulting in failure of the up_long_hemisp started 3-component test. No data are available from 20060428.1900 through 20060503.21:39. When the data returned, the short_direct normal fluctuated wildly throughout the day, and down_long_hemisp & up_long_hemisp failed the 3-component test. Technicians determined the NIP had failed and replaced it 5/12. Use component method ((global - diffuse)/cos(ZA)) to calculate direct normal. For more information on this summation method please see section 7.2 (Theory of Operation) of the SIRS Handbook: http://www.arm.gov/publications/tech_reports/handbooks/sirs_handbook.pdf |
| Measurements: | sgpsirsE16.b1:
sgpsirs20sE16.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/22/2006 | 1300 | 05/30/2006 | 2020 |
| Subject: | SGP/SIRS/E8 - Instrument cable problem |
| DataStreams: | sgpsirs20sE8.a0, sgpsirsE8.b1 |
| Description: | The short_direct_normal, down_short_diffuse_hemisp and up_short_hemisp data are missing or are spiking to negative numbers. On 20060530, technicians discovered cows had chewed on the instrument cables. |
| Measurements: | sgpsirs20sE8.a0:
sgpsirsE8.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/14/2006 | 1612 | 07/12/2006 | 1830 |
| Subject: | SGP/SIRS/E3 - Reprocess: Wrong Calibration Coefficients |
| DataStreams: | sgpsirs20sE3.a0, sgpsirsE3.b1 |
| Description: | No data were collected from 6/7/2006 0000 to 6/14/2006 1612 due to hardware problems. When data resumed on 6/14, ALL calibration coefficients and serial numbers were for different instruments possibly due to incorrect program loaded on storage module. Correct program reloaded by PM/CM techs on 7/12 1830GMT Shortwave data can be corrected with a simple multiplier as shown below. Longwave data must be reprocessed from temperature and netIR data. The data can be recalibrated as follows: First divide value by incorrectly applied cal coeff (first number) then multiply by correct cal coeff (second number). down_short_diffuse_hemisp 109.52 110.31 up_short_hemisp 111.61 109.80 short_direct_normal 115.73 118.82 down_short_hemisp 122.47 117.34 up_long_netir 0.26525 0.2564 down_long_netir 0.27173 0.2695 Reapply cal coeffs below using up_long_netIR(uV), inst_up_long_dome_temp(K), inst_up_long_dome_temp(K) using procedure described in SIRS instrument manual. up_long_hemisp k0 0.00 W/m^2 k1 0.2564 W/(m^2*uV) k2 1.00 unitless k3 -4.00 unitless kr 0.000 K/uV Reapply cal coeffs below using down_long_netIR(uV),inst_down_long_dome_temp (K),inst_down_long_dome_temp(K). down_long_hemisp_shaded k0 0.00 W/m^2 k1 0.2695 W/(m^2*uV) k2 1.00 unitless k3 -4.00 unitless kr 0.000 K/uV |
| Measurements: | sgpsirs20sE3.a0:
sgpsirsE3.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/12/2006 | 1100 | 07/21/2006 | 1635 |
| Subject: | SGP/SIRS/E9 - Tracker Failure |
| DataStreams: | sgpsirs20sE9.a0, sgpsirsE9.00, sgpsirsE9.b1 |
| 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 |
|---|---|---|---|
| 11/07/2006 | 0100 | 11/20/2006 | 2300 |
| Subject: | SGP/SIRS/E18 - Upwelling SW cable severed |
| DataStreams: | sgpsirs20sE18.a0, sgpsirsE18.00, sgpsirsE18.b1 |
| Description: | The Upwelling Shortwave signal was exceeding physical limits. Ops reported the upwelling shortwave cable was damaged by rodents. The cable was repaired and returned to service. |
| Measurements: | sgpsirs20sE18.a0:
sgpsirsE18.b1:
sgpsirsE18.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/13/2006 | 0900 | 01/23/2007 | 1930 |
| Subject: | SGP/SIRS/C1 - Upwelling SW cable problem |
| DataStreams: | sgpsirs20sC1.a0, sgpsirsC1.00, sgpsirsC1.b1 |
| Description: | Starting 11/13/2006, the C1 SIRS Upwelling Shortwave (up_short_hemisp) started to show large differences in comparison to co-located E13 SIRS and C1 IRT25m. After much troubleshooting and gnashing of teeth it was discovered that rodents had chewed through the instrument cables at the bottom of the tilt tower. Cables were replaced 01/23/2007 1930GMT. |
| Measurements: | sgpsirsC1.b1:
sgpsirsC1.00:
sgpsirs20sC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/29/2006 | 0600 | 12/05/2006 | 1830 |
| Subject: | SGP/SIRS/E24 - Spikes in data |
| DataStreams: | sgpsirs20sE24.a0, sgpsirsE24.b1 |
| Description: | The down_short_hemisp, down_long_hemisp, and upwelling_longwave showed large spikes (an order of magnitude) in data. Problem corrected itself on 12/5 before the site visit on 12/7. It is not known why the problem did not return but instruments affected were on the multiplexer. Maintenance reports it was not replaced. |
| Measurements: | sgpsirs20sE24.a0:
sgpsirsE24.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/31/2006 | 0600 | 12/12/2006 | 2105 |
| Subject: | SGP/SIRS/E7 - Instrument noise |
| DataStreams: | sgpsirs20sE7.a0, sgpsirsE7.b1 |
| Description: | Beginning around 10/31, the E7 UIR experienced an increasingly noisy signal. The thermopile signal was noisy, but case and dome thermistors are well behaved. Maintenance reseated the UIR cable connections on 12/12/2006 which effectively eliminated the UIR noise. The thermopile data from the upwelling pyrgeometer is noisy with resulting irradiance variations of up to 5 W/m2, but doesn't appear to have a bias. |
| Measurements: | sgpsirs20sE7.a0:
sgpsirsE7.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/03/2006 | 1509 | 03/06/2007 | 1610 |
| Subject: | SGP/SIRS/C1 - Reprocess: Incorrect calibration coefficients |
| DataStreams: | sgpsirs20sC1.a0, sgpsirsC1.00, sgpsirsC1.b1 |
| Description: | Incorrection calibration coefficients were used in the C1/SIRS datalogger program. The PSP-US (upwelling shortwave global hemispheric), 30943F3 should be 126.93 not 129.93 [W/m2/mV]. |
| Measurements: | sgpsirsC1.b1:
sgpsirsC1.00:
sgpsirs20sC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/06/2006 | 1722 | 04/12/2007 | 1810 |
| Subject: | SGP/SIRS/E22 - Reprocess: Incorrect calibration coefficients |
| DataStreams: | sgpsirs20sE22.a0, sgpsirsE22.00, sgpsirsE22.b1 |
| Description: | NIP (short_direct_normal) 29541E6 had an incorrect calibration coefficient in the logger program. 128.97 should have been 126.67 [W/m2/mV]. |
| Measurements: | sgpsirs20sE22.a0:
sgpsirsE22.b1:
sgpsirsE22.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/23/2006 | 0000 | 04/18/2007 | 1820 |
| Subject: | SGP/SIRS/E3 - Instrument leveling and tracker problem |
| DataStreams: | sgpsirs20sE3.a0, sgpsirsE3.b1 |
| Description: | Asymmetry between measured downwelling shortwave and derived downwelling shortwave hemispheric in the afternoon began late in fall and became more apparent as the sun moved higher in spring. This can happen when the PSP is unlevel or when the NIP is not tracking well. The PSP level was corrected and the clock on tracker was reset. Mentor suspects PSP was unlevel during this time range causing the discrepancy in measured vs. calculated downwelling shortwave hemispheric data. |
| Measurements: | sgpsirs20sE3.a0:
sgpsirsE3.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/24/2003 | 1302 | 01/28/2003 | 1949 |
| 01/30/2003 | 0226 | 02/05/2003 | 1951 |
| 07/11/2003 | 0002 | 07/15/2003 | 2001 |
| 05/18/2005 | 2132 | 05/26/2005 | 1827 |
| 05/27/2005 | 0000 | 05/31/2005 | 0646 |
| 12/10/2007 | 1803 | 12/13/2007 | 1850 |
| 04/17/2008 | 2246 | 04/23/2008 | 1440 |
| 05/04/2008 | 1823 | 05/17/2008 | 1447 |
| Subject: | SGP/SIRS/E20 - Missing data |
| DataStreams: | sgpsirs20sE20.a0, sgpsirsE20.b1 |
| Description: | Data are missing and unrecoverable. |
| Measurements: | sgpsirsE20.b1:
sgpsirs20sE20.a0:
|