DQR ID | Subject | Data Streams Affected |
---|---|---|
D010423.11 | SGP/SIRS/E10 - Diffuse Pyranometer Thermal Offsets | sgpsirsE10.a0, sgpsirsE10.a1 |
D010423.12 | SGP/SIRS/E11 - Diffuse Pyranometer Thermal Offsets | sgpsirsE11.a0, sgpsirsE11.a1 |
D010423.13 | SGP/SIRS/E12 - Diffuse Pyranometer Thermal Offsets | sgpsirsE12.a0, sgpsirsE12.a1 |
D010423.14 | SGP/SIRS/E13 - Diffuse Pyranometer Thermal Offsets | sgpsirsE13.a0, sgpsirsE13.a1 |
D010423.15 | SGP/SIRS/E15 - Diffuse Pyranometer Thermal Offsets | sgpsirsE15.a0, sgpsirsE15.a1 |
D010423.16 | SGP/SIRS/E16 - Diffuse Pyranometer Thermal Offsets | sgpsirsE16.a0, sgpsirsE16.a1 |
D010423.17 | SGP/SIRS/E18 - Diffuse Pyranometer Thermal Offsets | sgpsirsE18.a0, sgpsirsE18.a1 |
D010423.18 | SGP/SIRS/E19 - Diffuse Pyranometer Thermal Offsets | sgpsirsE19.a0, sgpsirsE19.a1 |
D030110.36 | SGP/SIRS/E10 - Noisy UIR | sgpsirs60sE10.a1, sgpsirsE10.a2, sgpsirsE10.b1 |
D030701.1 | SGP/SIRS/E10 - Noisy US(upwelling shortwave) data stream problem | sgpsirs20sE10.a0, sgpsirsE10.00, sgpsirsE10.b1 |
D030901.1 | SGP/SIRS/E19 - Shadowband Misalignment | sgpsirs20sE19.a0, sgpsirsE19.00, sgpsirsE19.b1 |
D030917.17 | SGP/SIRS/E13 - Missing data due to Ice storm and clock problems | sgp15swfanalsirs1longE13.c1, sgp1swfanalsirs1longE13.c1, sgpsirs20sE13.a0, sgpsirs60sE13.a1, sgpsirsE13.00, sgpsirsE13.a2, sgpsirsE13.b1 |
D030917.18 | SGP/SIRS/E18 - Missing data due to Ice storm and clock problems | sgp15swfanalsirs1longE18.c1, sgp1swfanalsirs1longE18.c1, sgpsirs20sE18.a0, sgpsirs60sE18.a1, sgpsirsE18.00, sgpsirsE18.a2, sgpsirsE18.b1 |
D031020.3 | SGP/SIRS/E18 - Instrument noise problem | sgpsirs20sE18.a0, sgpsirsE18.00, sgpsirsE18.b1 |
D031027.1 | SGP/SIRS/E10 - Noisy UIR (upwelling longwave)data stream problem | sgpsirs20sE10.a0, sgpsirsE10.00, sgpsirsE10.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 |
D040303.1 | SGP/SIRS/E16 - PSP Dome Contamination | sgpsirs20sE16.a0, sgpsirsE16.b1 |
D040525.10 | SGP/SIRS/E19 - Metadata errors | sgpsirsE19.a0, sgpsirsE19.a1 |
D040525.12 | SGP/SIRS/E19 - Metadata errors | sgpsirsE19.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 |
D040831.4 | SGP/SIRS/E10 - Reprocess: Incorrect shortwave radiometer calibration coefficients | sgpsirsE10.00, sgpsirsE10.b1 |
D040831.5 | SGP/SIRS/E11 - Reprocess: Incorrect shortwave radiometer calibration coefficients | sgpsirsE11.00, sgpsirsE11.b1 |
D040903.1 | SGP/SIRS/E11 - Reprocessed: Incorrect upwelling longwave calibrations | sgpsirsE11.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 |
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 |
D050205.4 | SGP/SIRS/E18 - Possible PSP dome contamination | sgpsirs20sE18.a0, sgpsirsE18.00, sgpsirsE18.b1 |
D050206.3 | SGP/SIRS/E13 - Monthly Report | sgpsirsE13.b1 |
D050429.1 | SGP/SIRS/E12 - Reprocess: Incorrect calibrations | sgpsirs20sE12.a0, sgpsirsE12.00, sgpsirsE12.b1 |
D050601.1 | SGP/SIRS/E13 - Reprocess: incorrect calibrations | sgpsirs20sE13.a0, sgpsirsE13.00, sgpsirsE13.b1 |
D060630.18 | SGP/SIRS/E10 - Reprocessed: Longwave Calibration error | sgpsirsE10.b1 |
D060630.19 | SGP/SIRS/E11 - Reprocessed: Longwave Calibration error | sgpsirsE11.b1 |
D060630.20 | SGP/SIRS/E12 - Reprocessed: Longwave Calibration error | sgpsirsE12.b1 |
D060630.21 | SGP/SIRS/E13 - Reprocessed: Longwave Calibration error | sgpsirsE13.b1 |
D060630.22 | SGP/SIRS/E15 - Reprocessed: Longwave Calibration error | sgpsirsE15.b1 |
D060630.23 | SGP/SIRS/E16 - Reprocessed: Longwave Calibration error | sgpsirsE16.b1 |
D060630.24 | SGP/SIRS/E18 - Reprocessed: Longwave Calibration error | sgpsirsE18.b1 |
D060630.25 | SGP/SIRS/E19 - Reprocessed: Longwave Calibration error | sgpsirsE19.b1 |
D990716.15 | SGP/SIRS - SIRS E10 April 1999 (SERI-QC Results) | sgpsirsE10.a0, sgpsirsE10.a1 |
D990716.23 | SGP/SIRS - SIRS E19 April 1999 (Part 2 of 7) | sgpsirsE19.a0, sgpsirsE19.a1 |
D990716.25 | SGP/SIRS - SIRS E19 April 1999 (Part 4 of 7) | sgpsirsE19.a0, sgpsirsE19.a1 |
D990716.27 | SGP/SIRS - SIRS E19 April 1999 (Part 6 of 7) | sgpsirsE19.a0, sgpsirsE19.a1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/05/1997 | 0656 | 02/14/2001 | 1500 |
Subject: | SGP/SIRS/E10 - Diffuse Pyranometer Thermal Offsets |
DataStreams: | sgpsirsE10.a0, sgpsirsE10.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: | sgpsirsE10.a0:
sgpsirsE10.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/22/1997 | 0805 | 02/20/2001 | 2040 |
Subject: | SGP/SIRS/E11 - Diffuse Pyranometer Thermal Offsets |
DataStreams: | sgpsirsE11.a0, sgpsirsE11.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: | sgpsirsE11.a0:
sgpsirsE11.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/31/1997 | 0357 | 02/20/2001 | 1655 |
Subject: | SGP/SIRS/E12 - Diffuse Pyranometer Thermal Offsets |
DataStreams: | sgpsirsE12.a0, sgpsirsE12.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: | sgpsirsE12.a0:
sgpsirsE12.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/29/1997 | 0421 | 02/22/2001 | 2021 |
Subject: | SGP/SIRS/E13 - Diffuse Pyranometer Thermal Offsets |
DataStreams: | sgpsirsE13.a0, sgpsirsE13.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: | sgpsirsE13.a0:
sgpsirsE13.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/26/1997 | 1225 | 02/20/2001 | 1730 |
Subject: | SGP/SIRS/E15 - Diffuse Pyranometer Thermal Offsets |
DataStreams: | sgpsirsE15.a0, sgpsirsE15.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: | sgpsirsE15.a1:
sgpsirsE15.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/21/1997 | 0735 | 02/21/2001 | 1620 |
Subject: | SGP/SIRS/E16 - Diffuse Pyranometer Thermal Offsets |
DataStreams: | sgpsirsE16.a0, sgpsirsE16.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: | sgpsirsE16.a1:
sgpsirsE16.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/15/1997 | 0825 | 02/20/2001 | 2220 |
Subject: | SGP/SIRS/E18 - Diffuse Pyranometer Thermal Offsets |
DataStreams: | sgpsirsE18.a0, sgpsirsE18.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: | sgpsirsE18.a0:
sgpsirsE18.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/08/1998 | 0145 | 02/22/2001 | 1535 |
Subject: | SGP/SIRS/E19 - Diffuse Pyranometer Thermal Offsets |
DataStreams: | sgpsirsE19.a0, sgpsirsE19.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: | sgpsirsE19.a0:
sgpsirsE19.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/01/2002 | 0000 | 11/08/2002 | 1900 |
Subject: | SGP/SIRS/E10 - Noisy UIR |
DataStreams: | sgpsirs60sE10.a1, sgpsirsE10.a2, sgpsirsE10.b1 |
Description: | Upwelling Infrared irradiance signals noisy resulting from problems with pyrgeometer signal cable connections. |
Measurements: | sgpsirsE10.b1:
sgpsirsE10.a2:
sgpsirs60sE10.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/22/2003 | 0146 | 07/02/2003 | 1400 |
Subject: | SGP/SIRS/E10 - Noisy US(upwelling shortwave) data stream problem |
DataStreams: | sgpsirs20sE10.a0, sgpsirsE10.00, sgpsirsE10.b1 |
Description: | Beginning 6/22, upwelling shortwave values frequently dropped well below 0 W/m^2 (occasionally dropping below -50 W/m^2) during the nighttime hours. Daytime values were excessively high and noisy. Instrument wiring was suspected and was corrected 07/02/2003. |
Measurements: | sgpsirsE10.b1:
sgpsirsE10.00:
sgpsirs20sE10.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/28/2003 | 1200 | 09/04/2003 | 1526 |
Subject: | SGP/SIRS/E19 - Shadowband Misalignment |
DataStreams: | sgpsirs20sE19.a0, sgpsirsE19.00, sgpsirsE19.b1 |
Description: | The solar tracker appears to have failed on 8/28. Fuse replaced on 09/04/03 and tracker returned to service at 15:26GMT |
Measurements: | sgpsirsE19.b1:
sgpsirs20sE19.a0:
sgpsirsE19.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/09/2002 | 2006 | 03/10/2002 | 1902 |
03/13/2002 | 1806 | 03/14/2002 | 1607 |
Subject: | SGP/SIRS/E13 - Missing data due to Ice storm and clock problems |
DataStreams: | sgp15swfanalsirs1longE13.c1, sgp1swfanalsirs1longE13.c1, sgpsirs20sE13.a0, sgpsirs60sE13.a1, sgpsirsE13.00, sgpsirsE13.a2, sgpsirsE13.b1 |
Description: | Data are missing due to power failures caused by an ice storm and resulting system/instrument clock problems. |
Measurements: | sgpsirsE13.b1:
sgpsirs60sE13.a1:
sgpsirsE13.a2:
sgpsirs20sE13.a0:
sgp15swfanalsirs1longE13.c1:
sgp1swfanalsirs1longE13.c1:
sgpsirsE13.00:
|
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: | sgp15swfanalsirs1longE18.c1, sgp1swfanalsirs1longE18.c1, sgpsirs20sE18.a0, sgpsirs60sE18.a1, sgpsirsE18.00, sgpsirsE18.a2, sgpsirsE18.b1 |
Description: | Data are missing due to power failures caused by an ice storm and resulting system/instrument clock problems. |
Measurements: | sgp1swfanalsirs1longE18.c1:
sgp15swfanalsirs1longE18.c1:
sgpsirsE18.b1:
sgpsirs20sE18.a0:
sgpsirsE18.a2:
sgpsirs60sE18.a1:
sgpsirsE18.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/09/2003 | 1000 | 10/20/2003 | 0000 |
Subject: | SGP/SIRS/E18 - Instrument noise problem |
DataStreams: | sgpsirs20sE18.a0, sgpsirsE18.00, sgpsirsE18.b1 |
Description: | Upwelling longwave data was somewhat noisy during this period. There was a direct relation to the case and dome thermistor measurements for the upwelling longwave PIR (UIR). Data quality does not appear to be greatly affected overall, though instantaneous values had greater than usual variability. The noise disappeared on 10/19. |
Measurements: | sgpsirs20sE18.a0:
sgpsirsE18.b1:
sgpsirsE18.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/29/2003 | 1500 | 08/06/2003 | 0500 |
Subject: | SGP/SIRS/E10 - Noisy UIR (upwelling longwave)data stream problem |
DataStreams: | sgpsirs20sE10.a0, sgpsirsE10.00, sgpsirsE10.b1 |
Description: | Beginning 6/29, upwelling longwave (UIR) values frequently exceeded quality control boundaries and appeared excessively noisy. Instrument wiring was suspected. Data remained noisy until 08/06/2003 0500GMT when the UIR data returned to normal. |
Measurements: | sgpsirsE10.b1:
sgpsirs20sE10.a0:
sgpsirsE10.00:
|
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 |
---|---|---|---|
02/06/2004 | 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 |
---|---|---|---|
07/08/1998 | 0145 | 03/31/2001 | 2359 |
Subject: | SGP/SIRS/E19 - Metadata errors |
DataStreams: | sgpsirsE19.a0, sgpsirsE19.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.a0:
sgpsirsE19.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/01/2002 | 0000 | 05/06/2003 | 2359 |
Subject: | SGP/SIRS/E19 - Metadata errors |
DataStreams: | sgpsirsE19.b1 |
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.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 |
---|---|---|---|
02/20/2004 | 1630 | 04/21/2004 | 1425 |
Subject: | SGP/SIRS/E10 - Reprocess: Incorrect shortwave radiometer calibration coefficients |
DataStreams: | sgpsirsE10.00, sgpsirsE10.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 SGP/SIRS/E10 and each one minute irradiance value perform the following calculations by instrument: DD(corrected) = (DD/107.24)*114.63 US(corrected) = (US/113.19)*117.46 NIP(corrected)= (NIP/120.17)*119.26 DS(corrected) = (DS/118.46)*122.78 |
Measurements: | sgpsirsE10.b1:
sgpsirsE10.00:
|
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 |
---|---|---|---|
05/04/2004 | 0000 | 06/22/2004 | 1855 |
Subject: | SGP/SIRS/E11 - Reprocessed: Incorrect upwelling longwave calibrations |
DataStreams: | sgpsirsE11.b1 |
Description: | Incorrect calibration coefficients were applied to the upwelling longwave measurements due to an error in the instrument configuration file. The data have been reprocessed to apply corrected calibrations. The reprocessed data were archived in August 2006. |
Measurements: | sgpsirsE11.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 |
---|---|---|---|
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 |
---|---|---|---|
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 |
---|---|---|---|
12/01/2004 | 0000 | 01/01/2005 | 0000 |
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 |
---|---|---|---|
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 |
---|---|---|---|
05/25/2005 | 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 |
---|---|---|---|
02/20/2004 | 1730 | 02/07/2006 | 2130 |
Subject: | SGP/SIRS/E10 - Reprocessed: Longwave Calibration error |
DataStreams: | sgpsirsE10.b1 |
Description: | Modified pyrgeometer calibration procedures were implemented beginning in February 2004. 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 August 2006. |
Measurements: | sgpsirsE10.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/17/2004 | 1753 | 02/14/2006 | 2016 |
Subject: | SGP/SIRS/E11 - Reprocessed: Longwave Calibration error |
DataStreams: | sgpsirsE11.b1 |
Description: | Modified pyrgeometer calibration procedures were implemented beginning in February 2004. 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 August 2006. |
Measurements: | sgpsirsE11.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/22/2003 | 1640 | 02/14/2006 | 1710 |
Subject: | SGP/SIRS/E12 - Reprocessed: Longwave Calibration error |
DataStreams: | sgpsirsE12.b1 |
Description: | Modified pyrgeometer calibration procedures were implemented beginning in July 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: | sgpsirsE12.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/11/2003 | 1935 | 02/16/2006 | 1905 |
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 |
---|---|---|---|
07/22/2003 | 1650 | 02/14/2006 | 1806 |
Subject: | SGP/SIRS/E15 - Reprocessed: Longwave Calibration error |
DataStreams: | sgpsirsE15.b1 |
Description: | Modified pyrgeometer calibration procedures were implemented beginning in July 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: | sgpsirsE15.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/23/2003 | 1605 | 02/15/2006 | 1533 |
Subject: | SGP/SIRS/E16 - Reprocessed: Longwave Calibration error |
DataStreams: | sgpsirsE16.b1 |
Description: | Modified pyrgeometer calibration procedures were implemented beginning in July 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: | sgpsirsE16.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/22/2003 | 2200 | 02/14/2006 | 2100 |
Subject: | SGP/SIRS/E18 - Reprocessed: Longwave Calibration error |
DataStreams: | sgpsirsE18.b1 |
Description: | Modified pyrgeometer calibration procedures were implemented beginning in July 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: | sgpsirsE18.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/24/2003 | 1600 | 02/16/2006 | 1558 |
Subject: | SGP/SIRS/E19 - Reprocessed: Longwave Calibration error |
DataStreams: | sgpsirsE19.b1 |
Description: | Modified pyrgeometer calibration procedures were implemented beginning in July 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: | sgpsirsE19.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/01/1999 | 0001 | 04/30/1999 | 2359 |
Subject: | SGP/SIRS - SIRS E10 April 1999 (SERI-QC Results) |
DataStreams: | sgpsirsE10.a0, sgpsirsE10.a1 |
Description: | Data quality for this site is excellent this month. Daytime data are 100 % present. Of the present daytime data, 98% are at or below the 5% quality assurance threshold. Severe flags early in the morning on the 4th through the 21st, and on the 30th indicate that the DS, DD and NIP are above twilight empirical limits. Low-level flags later in the morning and around mid-day during the second week of the month indicate that the DS is too low by the three-component test, or that the DD or NIP is too high. Low-level flags late in the afternoon on clear or partly cloudy days indicate the opposite. Heavily overcast skies pushed the DS and DD below daytime or twilight empirical limits on a number of occasions. On the afternoon of the 22nd the NIP, along with the DD and DS signals, fell below daytime limits for a few minutes. Moderate flags later the same day indicate that the DS is too high by the three-component test. No problems are notes in the UIR, DIR or US signals. |
Measurements: | sgpsirsE10.a0:
sgpsirsE10.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/03/1999 | 0001 | 04/04/1999 | 2130 |
Subject: | SGP/SIRS - SIRS E19 April 1999 (Part 2 of 7) |
DataStreams: | sgpsirsE19.a0, sgpsirsE19.a1 |
Description: | Missing data due to data ingest failure. |
Measurements: | sgpsirsE19.a0:
sgpsirsE19.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/07/1999 | 1901 | 04/09/1999 | 2000 |
Subject: | SGP/SIRS - SIRS E19 April 1999 (Part 4 of 7) |
DataStreams: | sgpsirsE19.a0, sgpsirsE19.a1 |
Description: | Missing due to data ingest problems. |
Measurements: | sgpsirsE19.a0:
sgpsirsE19.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/22/1999 | 1801 | 04/24/1999 | 2000 |
Subject: | SGP/SIRS - SIRS E19 April 1999 (Part 6 of 7) |
DataStreams: | sgpsirsE19.a0, sgpsirsE19.a1 |
Description: | Missing data due to problems with ingest. |
Measurements: | sgpsirsE19.a0:
sgpsirsE19.a1:
|