| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D010202.1 | SGP/SIRS/E21- Broken Cable | sgpsirsE21.a1 |
| D010423.20 | SGP/SIRS/E21 - Diffuse Pyranometer Thermal Offsets | sgpsirsE21.a0, sgpsirsE21.a1 |
| D010423.3 | SGP/SIRS/E2 - Diffuse Pyranometer Thermal Offsets | sgpsirsE2.a0, sgpsirsE2.a1 |
| D030917.18 | SGP/SIRS/E18 - Missing data due to Ice storm and clock problems | sgpsirsE18.00, sgpsirsE18.a2, sgpsirsE18.b1, sgpsirs20sE18.a0, sgpsirs60sE18.a1, sgp1swfanalsirs1longE18.c1, sgp15swfanalsirs1longE18.c1 |
| D030917.19 | SGP/SIRS/E2 - Missing data due to Ice storm and clock problems | sgpsirsE2.00, sgpsirsE2.a2, sgpsirsE2.b1, sgpsirs20sE2.a0, sgpsirs60sE2.a1, sgp1swfanalsirs1longE2.c1, sgp15swfanalsirs1longE2.c1 |
| D031031.16 | SGP/SIRS/E2 | sgpsirsE2.a0, sgpsirsE2.a1 |
| D031031.17 | SGP/SIRS/E2 | sgpsirsE2.a0, sgpsirsE2.a1 |
| D031031.18 | SGP/SIRS/E2 | sgpsirsE2.a0, sgpsirsE2.a1 |
| D031031.19 | SGP/SIRS/E2 - | sgpsirsE2.a0, sgpsirsE2.a1 |
| D040525.11 | SGP/SIRS/E19 - Metadata errors | sgpsirsE19.a2, sgpsirs60sE19.a1 |
| D990308.2 | SGP/SIRS/E2 - Reprocess: wrong calibration | sgpsirsE2.01, sgpsirsE2.a1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/17/2001 | 0000 | 01/24/2001 | 2359 |
| Subject: | SGP/SIRS/E21- Broken Cable |
| DataStreams: | sgpsirsE21.a1 |
| Description: | Short direct normal reported -99999 in netcdf file due to broken cable. |
| Measurements: | sgpsirsE21.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/11/1999 | 0304 | 02/20/2001 | 2100 |
| Subject: | SGP/SIRS/E21 - Diffuse Pyranometer Thermal Offsets |
| DataStreams: | sgpsirsE21.a0, sgpsirsE21.a1 |
| Description: | Broadband downwelling shortwave diffuse (sky) irradiance measurements available from SIRS during the period of this Data Quality Report (DQR), require adjustment for thermal offsets. These thermal, or ?zero? offsets refer to the generally reduced output signals from a shaded pyranometer due to the exchange of longwave (infrared) irradiance between the single black thermopile detector, the protective glass domes surrounding the detector, and the atmosphere. Originally considered an acceptable nighttime response of thermopile-type pyranometers, the generally negative bias is now recognized to significantly effect the accuracy of SIRS diffuse irradiance data during daylight periods. Studies of the Eppley Laboratory, Inc. Model PSP (Precision Spectral Pyranometer), used for the SIRS measurements of diffuse irradiance, suggest the thermal offset correction can range from near 0 to as much as 30 Watts per square meter, depending on the coincident net longwave, or infrared irradiance [1, 2]. Under very clear-sky conditions, the diffuse irradiance from a shaded PSP can be less than the minimum physical limit defined by radiative transfer model estimates based only on Rayleigh scattering effects. A correction method has been developed for adjusting SIRS diffuse irradiance data [3]. The resulting Value Added Product (VAP) will be applied to SIRS data for the period of this DQR. The VAP will not be applied to SIROS data collected before the instrument platform was converted to SIRS. Additionally, the Model PSP radiometer has been replaced by a Model 8-48 which uses a black and white thermopile detector known to reduce the thermal offset errors to less than 2 Watts per square meter [3]. The radiometer replacement at this SIRS location was completed on the ending date of this DQR. References: 1. Gulbrandsen, A., 1978: On the use of pyranometers in the study of spectral solar radiation and atmospheric aerosols. J. Appl. Meteorol., 17, 899-904. 2. Cess, R. D., X. Jing, T. Qian, and M. Sun, 1999: Validation strategies applied to the measurement of total, direct and diffuse shortwave radiation at the surface. J. Geophys. Res. 3. Dutton, E.G., J. Michalsky, T. Stoffel, B. Forgan, J. Hickey, D. Nelson, T. Alberta, and I. Reda, 2001: Measurement of Broadband Diffuse Solar Irradiance Using Current Commercial Instrumentation With a Correction for Thermal Offset Errors. J. Atmos. Oceanic Tech. Vol 18, No. 3, 297-314. (March 2001) |
| Measurements: | sgpsirsE21.a1:
sgpsirsE21.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/06/1997 | 1225 | 02/15/2001 | 1547 |
| Subject: | SGP/SIRS/E2 - Diffuse Pyranometer Thermal Offsets |
| DataStreams: | sgpsirsE2.a0, sgpsirsE2.a1 |
| Description: | Broadband downwelling shortwave diffuse (sky) irradiance measurements available from SIRS during the period of this Data Quality Report (DQR), require adjustment for thermal offsets. These thermal, or ?zero? offsets refer to the generally reduced output signals from a shaded pyranometer due to the exchange of longwave (infrared) irradiance between the single black thermopile detector, the protective glass domes surrounding the detector, and the atmosphere. Originally considered an acceptable nighttime response of thermopile-type pyranometers, the generally negative bias is now recognized to significantly effect the accuracy of SIRS diffuse irradiance data during daylight periods. Studies of the Eppley Laboratory, Inc. Model PSP (Precision Spectral Pyranometer), used for the SIRS measurements of diffuse irradiance, suggest the thermal offset correction can range from near 0 to as much as 30 Watts per square meter, depending on the coincident net longwave, or infrared irradiance [1, 2]. Under very clear-sky conditions, the diffuse irradiance from a shaded PSP can be less than the minimum physical limit defined by radiative transfer model estimates based only on Rayleigh scattering effects. A correction method has been developed for adjusting SIRS diffuse irradiance data [3]. The resulting Value Added Product (VAP) will be applied to SIRS data for the period of this DQR. The VAP will not be applied to SIROS data collected before the instrument platform was converted to SIRS. Additionally, the Model PSP radiometer has been replaced by a Model 8-48 which uses a black and white thermopile detector known to reduce the thermal offset errors to less than 2 Watts per square meter [3]. The radiometer replacement at this SIRS location was completed on the ending date of this DQR. References: 1. Gulbrandsen, A., 1978: On the use of pyranometers in the study of spectral solar radiation and atmospheric aerosols. J. Appl. Meteorol., 17, 899-904. 2. Cess, R. D., X. Jing, T. Qian, and M. Sun, 1999: Validation strategies applied to the measurement of total, direct and diffuse shortwave radiation at the surface. J. Geophys. Res. 3. Dutton, E.G., J. Michalsky, T. Stoffel, B. Forgan, J. Hickey, D. Nelson, T. Alberta, and I. Reda, 2001: Measurement of Broadband Diffuse Solar Irradiance Using Current Commercial Instrumentation With a Correction for Thermal Offset Errors. J. Atmos. Oceanic Tech. Vol 18, No. 3, 297-314. (March 2001) |
| Measurements: | sgpsirsE2.a1:
sgpsirsE2.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/09/2002 | 2102 | 03/10/2002 | 2040 |
| 03/13/2002 | 1702 | 03/14/2002 | 1604 |
| Subject: | SGP/SIRS/E18 - Missing data due to Ice storm and clock problems |
| DataStreams: | sgpsirsE18.00, sgpsirsE18.a2, sgpsirsE18.b1, sgpsirs20sE18.a0, sgpsirs60sE18.a1, sgp1swfanalsirs1longE18.c1, sgp15swfanalsirs1longE18.c1 |
| Description: | Data are missing due to power failures caused by an ice storm and resulting system/instrument clock problems. |
| Measurements: | sgpsirsE18.a2:
sgpsirs20sE18.a0:
sgp1swfanalsirs1longE18.c1:
sgpsirs60sE18.a1:
sgpsirsE18.b1:
sgp15swfanalsirs1longE18.c1:
sgpsirsE18.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/09/2002 | 2104 | 03/10/2002 | 2004 |
| 03/13/2002 | 1805 | 03/14/2002 | 1605 |
| Subject: | SGP/SIRS/E2 - Missing data due to Ice storm and clock problems |
| DataStreams: | sgpsirsE2.00, sgpsirsE2.a2, sgpsirsE2.b1, sgpsirs20sE2.a0, sgpsirs60sE2.a1, sgp1swfanalsirs1longE2.c1, sgp15swfanalsirs1longE2.c1 |
| Description: | Data are missing due to power failures caused by an ice storm and resulting system/instrument clock problems. |
| Measurements: | sgpsirsE2.a2:
sgpsirsE2.b1:
sgpsirs20sE2.a0:
sgpsirs60sE2.a1:
sgp15swfanalsirs1longE2.c1:
sgpsirsE2.00:
sgp1swfanalsirs1longE2.c1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/31/2000 | 1220 | 01/31/2000 | 1335 |
| Subject: | SGP/SIRS/E2 |
| DataStreams: | sgpsirsE2.a0, sgpsirsE2.a1 |
| Description: | This test was designed more for daytime data. The NIP should be considered bad here, not the Longwave components. |
| Measurements: | sgpsirsE2.a1:
sgpsirsE2.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/04/2000 | 1700 | 01/04/2000 | 1815 |
| Subject: | SGP/SIRS/E2 |
| DataStreams: | sgpsirsE2.a0, sgpsirsE2.a1 |
| Description: | Data are too low by the three-component test (internal consistency checks; descriptions of testing criteria can be found at http://rredc.nrel.gov/solar/pubs/seri_qc.) Visual inspection suggests dirt or debris on pyranometer dome. |
| Measurements: | sgpsirsE2.a1:
sgpsirsE2.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/04/2000 | 1715 | 01/04/2000 | 1805 |
| Subject: | SGP/SIRS/E2 |
| DataStreams: | sgpsirsE2.a0, sgpsirsE2.a1 |
| Description: | Data are too high by three-component test (internal consistency checks; descriptions of testing criteria can be found at http://rredc.nrel.gov/solar/pubs/seri_qc.) Visual inspection suggests that the data are good. |
| Measurements: | sgpsirsE2.a1:
sgpsirsE2.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/01/2000 | 0000 | 02/01/2000 | 0000 |
| Subject: | SGP/SIRS/E2 - |
| DataStreams: | sgpsirsE2.a0, sgpsirsE2.a1 |
| Description: | Data quality this month is OK. The notable problems follow. Nighttime offsets in the Downwelling Diffuse pyranometer (DD) average about -5 W/m^2 for the month. This sun sets but gradually reaches an equilibrium offset of less than -2 W/m^2. The DS pyranometer goes below empirical limits immediately after sunset on the 2nd, 4th, 6th, 7th, 11th, 12th, and 13th. There are moderate inconsistencies between the Global (DS), Direct (NIP) and Diffuse (DD) components for the 18th and 20th in the morning and the 2nd, 4th, 6th, and 13th in the evening. For the morning occurrences of this problem NIP and DD are too high and DS is too low and vice versa for the evening. This problem seems to have been rectified by the site ops' visit on the 20th of the month, as no significant three-component problems occur after the 20th. It should also be noted that the calibration factors for the PSP's have a tolerance of plus or minus 5% and the NIP has a tolerance of plus or minus 3%. Upwelling longwave inexplicably goes below empirical limits numerous times on the 4th for a total of about 4 and a half hours. Something happens with the Upwelling Shortwave (US) on the 3rd and 4th where it exceeds its daytime empirical limit. Snowy conditions is the likely cause. |
| Measurements: | sgpsirsE2.a1:
sgpsirsE2.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/01/2001 | 0000 | 04/17/2003 | 2359 |
| Subject: | SGP/SIRS/E19 - Metadata errors |
| DataStreams: | sgpsirsE19.a2, sgpsirs60sE19.a1 |
| Description: | The latitude, longitude and altitude of the El Reno (E19) site were incorrectly entered into the ARM database. The correct location of the SIRS.E19 instrument is: Lat: 35.557N Lon: 98.017W Alt: 421m |
| Measurements: | sgpsirsE19.a2:
sgpsirs60sE19.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/06/1997 | 0000 | 11/26/1997 | 1720 |
| Subject: | SGP/SIRS/E2 - Reprocess: wrong calibration |
| DataStreams: | sgpsirsE2.01, sgpsirsE2.a1 |
| Description: | Mike Splitt found the following in the Site Ops OMIS data base from E2 on
11/26/97 :
Found that the wrong calibration sticker was placed on the nip
and the wrong Cal factor had been entered in the program. Also
while editing the program I found that I had the wrong Cal
factor for the DS. I inserted the correct Cal factors for the DS
and Nip, complied and down loaded the new program into
SIRS_02 at 1720GMT on 11/26/97
This entry was made by Craig Webb.
The problem was reported in P971121.1 |
| Measurements: | sgpsirsE2.a1:
sgpsirsE2.01:
|