| DQR ID | Subject | Data Streams Affected | Data Quality Metric |
|---|---|---|---|
| D030917.17 | SGP/SIRS/E13 - Missing data due to Ice storm and clock problems | sgpsirsE13.b1 | Missing |
| D040907.1 | SGP/SIRS/C1/E13 - Incorrect calibration coefficients | sgpsirsE13.b1 | Incorrect |
| D050206.3 | SGP/SIRS/E13 - Monthly Report | sgpsirsE13.b1 | Does not affect quality |
| D050601.1 | SGP/SIRS/E13 - Reprocess: incorrect calibrations | sgpsirsE13.b1 | Incorrect |
| D060630.21 | SGP/SIRS/E13 - Reprocessed: Longwave Calibration error | sgpsirsE13.b1 | Does not affect quality |
| D080104.1 | SGP/SIRS/E13 - Multiplexer failure | sgpsirsE13.b1 | Incorrect |
| 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 | sgpsirsE13.b1 | Suspect |
| D110725.2 | SGP/SIRS/E13 - NIP damaged by lightning strike | sgpsirsE13.b1 | Incorrect |
| D111115.3 | SGP/SIRS/E13 - Intermittent upwelling longwave | sgpsirsE13.b1 | Incorrect |
| D121003.1 | SGP/SIRS/E13 - Instrument problem | sgpsirsE13.b1 | Suspect |
| D121003.2 | SGP/SIRS/E13 - Reprocessed: Incorrect UIR calibration | sgpsirsE13.b1 | Does not affect quality |
| D121211.1 | SGP/SIRS/E13 - Upwelling LW hemisp connection | sgpsirsE13.b1 | Incorrect |
| D130329.1 | SGP/SIRS/E13 - UIR Instrument problem | sgpsirsE13.b1 | Incorrect |
| D151201.2 | SGP ALL INSTRUMENTS - Icing Event | sgpsirsE13.b1 | Does not affect quality |
| D160104.7 | SGP Site Power Outage Due to Winter Storm | sgpsirsE13.b1 | Does not affect quality |
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 03/13/2002 | 1806 | 03/14/2002 | 1607 | Missing |
| 03/09/2002 | 2006 | 03/10/2002 | 1902 | Missing |
| Subject: | SGP/SIRS/E13 - Missing data due to Ice storm and clock problems |
| DataStreams: | sgpsirsE13.b1 |
| Description: | Data are missing due to power failures caused by an ice storm and resulting system/instrument clock problems. |
| Measurements: | sgpsirsE13.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 08/27/2004 | 1830 | 09/07/2004 | 2130 | Incorrect |
| Subject: | SGP/SIRS/C1/E13 - Incorrect calibration coefficients |
| DataStreams: | 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:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 12/01/2004 | 0000 | 01/01/2005 | 0000 | Does not affect quality |
| Subject: | SGP/SIRS/E13 - Monthly Report |
| DataStreams: | sgpsirsE13.b1 |
| Description: | :Data quality this site-month is good. The offset for the Global PSP is about -7 W/m^2. The 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, 7th - 20th, 24th - 28th, 30th, and 31st. The failures vary in magnitude and duration. The worst flags for a particular 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 afternoon. 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. |
| Measurements: | sgpsirsE13.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 05/25/2005 | 1409 | 06/02/2005 | 2205 | Incorrect |
| Subject: | SGP/SIRS/E13 - Reprocess: incorrect calibrations |
| DataStreams: | 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:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 12/11/2003 | 1935 | 02/16/2006 | 1905 | Does not affect quality |
| Subject: | SGP/SIRS/E13 - Reprocessed: Longwave Calibration error |
| DataStreams: | sgpsirsE13.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: | sgpsirsE13.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 12/27/2007 | 1900 | 01/07/2008 | 1525 | Incorrect |
| Subject: | SGP/SIRS/E13 - Multiplexer failure |
| DataStreams: | sgpsirsE13.b1 |
| Description: | The down_short_hemisp (PSP), down_long_hemisp_shaded (DIR) and up_long_hemisp (UIR) experienced frequent dropouts due to a failing multiplexer. CM replaced mux on 1/7. |
| Measurements: | sgpsirsE13.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 12/10/2007 | 0000 | 12/25/2007 | 2359 | Suspect |
| Subject: |
|
| DataStreams: | sgpsirsE13.b1 |
| 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: | sgpsirsE13.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 06/12/2011 | 0539 | 06/14/2011 | 1556 | Incorrect |
| Subject: | SGP/SIRS/E13 - NIP damaged by lightning strike |
| DataStreams: | sgpsirsE13.b1 |
| Description: | Apparent lightning strike in the instrument cluster area resulted in a failed NIP. The SIRS was due for calibration change outs so the US, DS, DD and NIP were replaced. The updated program was loaded at approximately 1730 GMT. An estimate of direct normal values can be derived using the following formula: short_direct_normal = (down_short_hemisp - down_short_diffuse_hemisp)/cos(zenith angle) |
| Measurements: | sgpsirsE13.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 09/19/2011 | 1512 | 10/27/2011 | 1559 | Incorrect |
| Subject: | SGP/SIRS/E13 - Intermittent upwelling longwave |
| DataStreams: | sgpsirsE13.b1 |
| Description: | Beginning 9/19/2011 @ 15:12, the upwelling longwave values are often spiking to large and small values throughout the day. A multiplexer was found to be the problem and the ops replaced it on 10/27/2011. Incorrect data are not recoverable for the specified time range. However, good data exists within the time range. The SGPQCRAD VAP data stream provides flags for "good" data and appears to accurately flag bad data during this time range. Users are advised to use this data stream to screen for correct up_long_hemisp values. |
| Measurements: | sgpsirsE13.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 05/13/2012 | 0000 | 09/20/2012 | 2045 | Suspect |
| Subject: | SGP/SIRS/E13 - Instrument problem |
| DataStreams: | sgpsirsE13.b1 |
| Description: | up_long_hemisp measurements are intermittant and remain so after extensive troubleshooting. This problem will likly remain open ended until site ops can replace the cable which serves the up_long_hemisp instrument (i.e. the Eppley PIR). |
| Measurements: | sgpsirsE13.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 08/30/2012 | 2058 | 09/20/2012 | 1852 | Does not affect quality |
| Subject: | SGP/SIRS/E13 - Reprocessed: Incorrect UIR calibration |
| DataStreams: | sgpsirsE13.b1 |
| Description: | For the time range specified the UIR had incorrect calibration coefficients applied. The k1 coefficient applied was 0.25042 when it should have been 0.2558. This resulted in the instrument under reporting up_long_hemsip by approximately 2.1%. Reprocessing completed 20121119 |
| Measurements: | sgpsirsE13.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 10/25/2012 | 0850 | 11/21/2012 | 1540 | Incorrect |
| Subject: | SGP/SIRS/E13 - Upwelling LW hemisp connection |
| DataStreams: | sgpsirsE13.b1 |
| Description: | On 10/25 an intermittent problem began on the up_long_hemispheric (UIR) instrument dome thermistor which resulted in incorrect or missing calculated flux. Maintenance tightened connections on 11/21 which appears to have resolved the problem. |
| Measurements: | sgpsirsE13.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 01/30/2013 | 0000 | 03/26/2013 | 2122 | Incorrect |
| Subject: | SGP/SIRS/E13 - UIR Instrument problem |
| DataStreams: | sgpsirsE13.b1 |
| Description: | Due to a bad connection the up_long_hemisp datastream (upwelling Epply PIR instrument) has intermittent missing data during the time range specified. Missing data are not recoverable. However, the sgpqcrad1longE13.c1 datastream adequately identifies missing values and removes them. Recommendation to the user is to use this VAP datastream for valid values of up_long_hemisp irradiance from this station. |
| Measurements: | sgpsirsE13.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 11/27/2015 | 0000 | 11/30/2015 | 2359 | Does not affect quality |
| Subject: | SGP ALL INSTRUMENTS - Icing Event |
| DataStreams: | sgpsirsE13.b1 |
| Description: | An icing event (winter storm Cara) passed slowly through the area during this time frame. Instruments at the SGP may have been affected by ice accumulation. |
| Measurements: | sgpsirsE13.b1:
|
| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 12/26/2015 | 0000 | 01/01/2016 | 2359 | Does not affect quality |
| Subject: | SGP Site Power Outage Due to Winter Storm |
| DataStreams: | sgpsirsE13.b1 |
| Description: | On Saturday and Sunday, December 26 and 27th a powerful winter storm (Goliath) brought sleet and freezing rain to much of Oklahoma with wind gusts of 45 MPH at times. The result was very very slick roads and mass power outages. The SGP central facility lost power at 8:55 PM CDT on Sunday, December 27th. The power was restored on 7:56 PM CDT on Wednesday, December 30th Site Emergency procedures were activated and Technicians drained water out of instrument reservoirs and other measures as needed, early Monday morning. On Wednesdays as roads and power started was restored to much of the areas east of I-35 , Site Technicians performed maintenance on several Extended Facilities. During this period, data are potentially missing, incorrect, or suspect. Carefully inspect the data before use. |
| Measurements: | sgpsirsE13.b1:
|