DQR ID | Subject | Data Streams Affected |
---|---|---|
D000907.1 | SGP/SIRS/E24 - SIRS Signal Cable Damage at E24 | sgpsirsE24.00, sgpsirsE24.01, sgpsirsE24.a0, sgpsirsE24.a1 |
D010202.1 | SGP/SIRS/E21- Broken Cable | sgpsirsE21.a1 |
D010423.19 | SGP/SIRS/E20 - Diffuse Pyranometer Thermal Offsets | sgpsirsE20.a0, sgpsirsE20.a1 |
D010423.20 | SGP/SIRS/E21 - Diffuse Pyranometer Thermal Offsets | sgpsirsE21.a0, sgpsirsE21.a1 |
D010423.21 | SGP/SIRS/E22 - Diffuse Pyranometer Thermal Offsets | sgpsirsE22.a0, sgpsirsE22.a1 |
D010423.22 | SGP/SIRS/E24 - Diffuse Pyranometer Thermal Offsets | sgpsirsE24.a0, sgpsirsE24.a1 |
D030527.2 | SGP/SIRS/E27 - Instrument problem, Shadowband Misalignment | sgpsirs20sE27.a0, sgpsirsE27.00, sgpsirsE27.b1 |
D030529.3 | SGP/SIRS/E21 - Shadowband Misalignment/Tracker Failure | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
D030612.1 | SGP/SIRS/E21 - Shadowband Misalignment/Tracker Failure | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
D030722.2 | SGP/SIRS/E21 - Shadowband Misalignment | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
D030917.16 | SGP/SIRS/C1 - Missing data due to Ice storm and clock problems | sgp15swfanalsirs1longC1.c1, sgp1swfanalsirs1longC1.c1, sgpsirs20sC1.a0, sgpsirs60sC1.a1, sgpsirsC1.00, sgpsirsC1.a2, sgpsirsC1.b1 |
D030917.19 | SGP/SIRS/E2 - Missing data due to Ice storm and clock problems | sgp15swfanalsirs1longE2.c1, sgp1swfanalsirs1longE2.c1, sgpsirs20sE2.a0, sgpsirs60sE2.a1, sgpsirsE2.00, sgpsirsE2.a2, sgpsirsE2.b1 |
D030922.4 | SGP/SIRS/E27 - Tracker Misalignment | sgpsirs20sE27.a0, sgpsirsE27.00, sgpsirsE27.b1 |
D031009.2 | SGP/SIRS/E21 - Reprocess: Incorrect PIR/UIR Calibration Coefficient | sgpsirsE21.00, sgpsirsE21.b1 |
D031020.4 | SGP/SIRS/E21 - Bird Poop Contamination | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
D040126.3 | SGP/SIRS/E21 - False signal | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
D040229.2 | SGP/SIRS/E21 - Shadowband Misalignment | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
D040329.1 | SGP/SIRS/E21 - Instrument logger time problem, Unknown | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.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 |
D040706.1 | SGP/SIRS/E22 - Failed NIP sensor cable | sgpsirs20sE22.a0, sgpsirsE22.00, sgpsirsE22.b1 |
D040712.2 | SGP/SIRS/E24 - NIP shaded near sunrise | sgpsirs20sE24.a0, sgpsirs60sE24.a1, sgpsirsE24.a2, sgpsirsE24.b1 |
D040712.3 | SGP/SIRS/E24 - NIP shaded near sunrise | sgpsirs20sE24.a0, sgpsirsE24.b1 |
D050227.1 | SGP/SIRS/E24 - Erratic downwelling shortwave data | sgpsirs20sE24.a0, sgpsirsE24.00, sgpsirsE24.b1 |
D050412.3 | SGP/SIRS/E24 - Dirt on dome | sgpsirs20sE24.a0, sgpsirsE24.00, sgpsirsE24.b1 |
D050520.1 | SGP/SIRS/E22 - Intermittent upwelling longwave data loss | sgpsirs20sE22.a0, sgpsirsE22.00, sgpsirsE22.b1 |
D060630.26 | SGP/SIRS/E20 - Reprocessed: Longwave Calibration error | sgpsirsE20.b1 |
D060630.27 | SGP/SIRS/E21 - Reprocessed: Longwave Calibration error | sgpsirsE21.b1 |
D060630.28 | SGP/SIRS/E22 - Reprocessed: Longwave Calibration error | sgpsirsE22.b1 |
D060630.29 | SGP/SIRS/E24 - Reprocessed: Longwave Calibration error | sgpsirsE24.b1 |
D060630.30 | SGP/SIRS/E27 - Reprocessed: Longwave Calibration error | sgpsirsE27.b1 |
D080610.1 | SGP/SIRS/E20 - Missing data | sgpsirs20sE20.a0, sgpsirsE20.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/08/2000 | 0510 | 02/10/2000 | 1700 |
Subject: | SGP/SIRS/E24 - SIRS Signal Cable Damage at E24 |
DataStreams: | sgpsirsE24.00, sgpsirsE24.01, sgpsirsE24.a0, sgpsirsE24.a1 |
Description: | Cattle from adjoining field had broken the electric fence wire around the equipment and chewed radiometer cables in half adn damaged the shading arm(s) on the SciTec tracker. The NIP and DD shortwave data collected during this time were recorded by the logger as 'over-range' or 'open-channel' (with corresponding data values stored as '-99999') or a numeric value not representative of the real irradiance conditions due to faulty connections. Data for this period are to be considered MISSING. |
Measurements: | sgpsirsE24.00:
sgpsirsE24.a1:
sgpsirsE24.01:
sgpsirsE24.a0:
|
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 |
---|---|---|---|
02/13/1998 | 0532 | 02/20/2001 | 1850 |
Subject: | SGP/SIRS/E20 - Diffuse Pyranometer Thermal Offsets |
DataStreams: | sgpsirsE20.a0, sgpsirsE20.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: | sgpsirsE20.a1:
sgpsirsE20.a0:
|
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 |
---|---|---|---|
11/25/1997 | 0630 | 02/21/2001 | 2000 |
Subject: | SGP/SIRS/E22 - Diffuse Pyranometer Thermal Offsets |
DataStreams: | sgpsirsE22.a0, sgpsirsE22.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: | sgpsirsE22.a0:
sgpsirsE22.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/03/1997 | 0730 | 02/22/2001 | 1615 |
Subject: | SGP/SIRS/E24 - Diffuse Pyranometer Thermal Offsets |
DataStreams: | sgpsirsE24.a0, sgpsirsE24.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: | sgpsirsE24.a1:
sgpsirsE24.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/16/2003 | 0000 | 06/18/2003 | 1845 |
Subject: | SGP/SIRS/E27 - Instrument problem, Shadowband Misalignment |
DataStreams: | sgpsirs20sE27.a0, sgpsirsE27.00, sgpsirsE27.b1 |
Description: | Downwelling and Upwelling longwave values are somewhat noisy due to noisy PIR (pygeometer) case and dome thermistor measurements on both the upwelling and downwelling PIRs. This problem dates back to the beginning of the SIRS E27 data stream. |
Measurements: | sgpsirsE27.00:
sgpsirsE27.b1:
sgpsirs20sE27.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/19/2003 | 1000 | 05/28/2003 | 1430 |
Subject: | SGP/SIRS/E21 - Shadowband Misalignment/Tracker Failure |
DataStreams: | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
Description: | The solar tracker failed beginning around sunrise on 05/19/03 most likely during the previous nights reset. Failure time was approximate time of sunrise at 1000 on 05/19/03. The tracker was power cycled and RTS at 1415 GMT on 05/28/03. |
Measurements: | sgpsirsE21.00:
sgpsirs20sE21.a0:
sgpsirsE21.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/03/2003 | 1000 | 06/16/2003 | 1835 |
Subject: | SGP/SIRS/E21 - Shadowband Misalignment/Tracker Failure |
DataStreams: | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
Description: | Suntracker appears to have failed beginning on 6/3/03, most likely during previous night reset. Start time listed is approximate time of sunrise. |
Measurements: | sgpsirsE21.00:
sgpsirs20sE21.a0:
sgpsirsE21.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/17/2003 | 1000 | 08/06/2003 | 1350 |
Subject: | SGP/SIRS/E21 - Shadowband Misalignment |
DataStreams: | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
Description: | Solar tracker stopped functioning on 7/17. Tracker power cycled on 07/24 and returned to normal tracking but failed again 7/25. Power was cycled again 8/6 and tracker performance was sustained thereafter. |
Measurements: | sgpsirsE21.00:
sgpsirs20sE21.a0:
sgpsirsE21.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/09/2002 | 2101 | 03/10/2002 | 2125 |
03/13/2002 | 1801 | 03/14/2002 | 1602 |
Subject: | SGP/SIRS/C1 - Missing data due to Ice storm and clock problems |
DataStreams: | sgp15swfanalsirs1longC1.c1, sgp1swfanalsirs1longC1.c1, sgpsirs20sC1.a0, sgpsirs60sC1.a1, sgpsirsC1.00, sgpsirsC1.a2, sgpsirsC1.b1 |
Description: | Data are missing due to power failures caused by an ice storm and resulting system/instrument clock problems. |
Measurements: | sgp1swfanalsirs1longC1.c1:
sgpsirsC1.b1:
sgpsirsC1.00:
sgpsirs60sC1.a1:
sgp15swfanalsirs1longC1.c1:
sgpsirs20sC1.a0:
sgpsirsC1.a2:
|
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: | sgp15swfanalsirs1longE2.c1, sgp1swfanalsirs1longE2.c1, sgpsirs20sE2.a0, sgpsirs60sE2.a1, sgpsirsE2.00, sgpsirsE2.a2, sgpsirsE2.b1 |
Description: | Data are missing due to power failures caused by an ice storm and resulting system/instrument clock problems. |
Measurements: | sgp15swfanalsirs1longE2.c1:
sgpsirs60sE2.a1:
sgpsirsE2.b1:
sgpsirsE2.00:
sgpsirs20sE2.a0:
sgp1swfanalsirs1longE2.c1:
sgpsirsE2.a2:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/14/2003 | 1200 | 10/15/2003 | 1730 |
Subject: | SGP/SIRS/E27 - Tracker Misalignment |
DataStreams: | sgpsirs20sE27.a0, sgpsirsE27.00, sgpsirsE27.b1 |
Description: | Suntracker failed at this facility. The suntracker was reset on 9/17, but this only temporarily fixed the problem and the tracker began failing again 9/18. Tracker was reset and realigned on 10/15/03 17:30GMT and has been operating properly since. |
Measurements: | sgpsirsE27.00:
sgpsirsE27.b1:
sgpsirs20sE27.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/23/2003 | 1330 | 08/08/2003 | 1650 |
Subject: | SGP/SIRS/E21 - Reprocess: Incorrect PIR/UIR Calibration Coefficient |
DataStreams: | sgpsirsE21.00, sgpsirsE21.b1 |
Description: | Incorrect coefficients were applied to the upwelling longwave radiation measurement instrument (i.e. pyrgeometer, SIRS acroynm "UIR") during this time period. For a PIR mounted in an upwelling measurement orientation (UIR), the thermopile output is extremely low compared to a downwelling PIR (DIR). In addition, the UIR case and dome temperature differences are much smaller than a DIR. This results in the pyrgeometer receiver radiation term, Wr (NREL/Hickey equation) or Wc (Albrecht/Cox equation), dominating all other terms of the infrared radiant flux equation. Since the receiver radiation term uses coefficients in both forms of the pyrgeometer equations nearly equal to 1.0 +- <1% the result is a measurement of incoming longwave radiant flux relatively insensitive to the installed instrument - so long as it is an Eppley PIR. Evaluation of the problem data shows the expected error of the data (before correction) will be within 1% - less than the uncertainty of the instrument (Eppley PIR greater of 5% or 5 W/m2) To correct the one minute data found in the a1 or b1 datastream follow this procedure: 1) Obtain the following variables from the b1 datafile: inst_up_long_dome_temp inst_up_long_case_temp up_long_netir 2) For each one minute data entry in b1 tpUIR[uV] = up_long_netir[uV]/0.2523876[W/m2/uV] 3) Apply for each one minute data entry: WinUIR(W/m2)=k*V+ Sigma*Tc^4 -4*Sigma*(Td^4 - Tc^4) =[0.28902*tpUIR]+[Sigma*inst_up_long_case_temp^4] -[4*Sigma*(inst_up_long_dome_temp^4-inst_up_long_case^4)] where, Sigma = 5.6697E-8 (Stefan-Boltzman Const) Other datastream corrections that use the UIR measurements will require similar corrections. See the following web site for additional information on the pyrgeometer equations, specifically sections 2.1(Single Calibration Factor Approach) and 2.2 (Four Coefficient Calibration Approach) http://www.arm.gov/docs/instruments/static/pyrg.html |
Measurements: | sgpsirsE21.00:
sgpsirsE21.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/18/2003 | 1600 | 10/29/2003 | 1630 |
Subject: | SGP/SIRS/E21 - Bird Poop Contamination |
DataStreams: | sgpsirs20sE21.a0, sgpsirsE21.00, sgpsirsE21.b1 |
Description: | Downwelling shortwave values were erratic during the day on 10/18 and in very poor agreement at times with downwelling shortwave values calculated from direct and diffuse measurements. Bi-weekly preventative maintenace records indicate bird poop was cleaned from the downwelling shortwave instrument on 10/29 at 16:30. Review of maintenance records and instrument data indicate no bird contamination since 10/29. Turkey vultures are the usual suspects in data quality problems at this facility. The RBD(rotating bird deterrent) had failed the week of 10/13 and is awaiting parts. However, beginning in late October the birds had left the site. |
Measurements: | sgpsirsE21.00:
sgpsirs20sE21.a0:
sgpsirsE21.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 |
---|---|---|---|
02/20/2004 | 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 |
---|---|---|---|
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 |
---|---|---|---|
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 |
---|---|---|---|
06/30/2004 | 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 |
---|---|---|---|
04/08/2002 | 1200 | 05/20/2002 | 1300 |
07/26/2002 | 1300 | 09/06/2002 | 1200 |
04/08/2003 | 1200 | 04/16/2003 | 1300 |
Subject: | SGP/SIRS/E24 - NIP shaded near sunrise |
DataStreams: | sgpsirs20sE24.a0, sgpsirs60sE24.a1, sgpsirsE24.a2, 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:
sgpsirs60sE24.a1:
sgpsirsE24.b1:
sgpsirsE24.a2:
|
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 |
---|---|---|---|
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 |
---|---|---|---|
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 |
---|---|---|---|
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 |
---|---|---|---|
07/23/2003 | 2100 | 02/15/2006 | 2030 |
Subject: | SGP/SIRS/E20 - Reprocessed: Longwave Calibration error |
DataStreams: | sgpsirsE20.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 November 2006. |
Measurements: | sgpsirsE20.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/23/2003 | 1520 | 02/15/2006 | 1515 |
Subject: | SGP/SIRS/E21 - Reprocessed: Longwave Calibration error |
DataStreams: | sgpsirsE21.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 November 2006. |
Measurements: | sgpsirsE21.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/23/2003 | 1830 | 02/15/2006 | 1741 |
Subject: | SGP/SIRS/E22 - Reprocessed: Longwave Calibration error |
DataStreams: | sgpsirsE22.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 August 2006. |
Measurements: | sgpsirsE22.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/24/2003 | 1640 | 02/16/2006 | 1705 |
Subject: | SGP/SIRS/E24 - Reprocessed: Longwave Calibration error |
DataStreams: | sgpsirsE24.b1 |
Description: | Modified pyrgeometer calibration procedures were implemented beginning in July 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 October 2006. |
Measurements: | sgpsirsE24.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/16/2003 | 0002 | 02/15/2006 | 1750 |
Subject: | SGP/SIRS/E27 - Reprocessed: Longwave Calibration error |
DataStreams: | sgpsirsE27.b1 |
Description: | Modified pyrgeometer calibration procedures were implemented beginning in May 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: | sgpsirsE27.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:
|