Data Quality Reports for Session: 103409 User: elena Completed: 12/25/2006


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D040608.2SGP/BRS/C1 - NIP sensor failuresgpbrsC1.00, sgpbrsC1.b1, sgpbrs20sC1.a0
D050322.1SGP/BRS/C1 - low downwelling shortwave readingssgpbrsC1.00, sgpbrsC1.b1, sgpbrs20sC1.a0
D060630.7SGP/BRS/C1 - Reprocessed: Longwave Calibration errorsgpbrsC1.b1
D061102.1SGP/BRS/C1 - Reprocess: Calibration error in Downwelling Longwave measurementsgpbrsC1.b1, sgpbrs20sC1.a0


DQRID : D040608.2
Start DateStart TimeEnd DateEnd Time
06/02/2004173406/15/20042010
Subject:
SGP/BRS/C1 - NIP sensor failure
DataStreams:sgpbrsC1.00, sgpbrsC1.b1, sgpbrs20sC1.a0
Description:
Normal incidence values of downwelling shortwave radiation were
               reported as -9999 (missing).  The NIP instrument was damaged by
               lightning in the area near the time of failure.
Measurements:sgpbrs20sC1.a0:
  • Instantaneous Direct Normal Shortwave Irradiance, Pyrheliometer Thermopile
    Voltage(inst_direct_normal)

sgpbrsC1.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)

sgpbrsC1.b1:
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Standard Deviation(short_direct_normal_std)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer(short_direct_normal)


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DQRID : D050322.1
Start DateStart TimeEnd DateEnd Time
04/18/2003000012/17/20042030
Subject:
SGP/BRS/C1 - low downwelling shortwave readings
DataStreams:sgpbrsC1.00, sgpbrsC1.b1, sgpbrs20sC1.a0
Description:
Downwelling shortwave (DS) values frequently drop below -10 W/m^2 at night, and are 
consistently 20-40 W/m^2 less than the calculated downwelling shortwave during the day in 
clear-sky conditions. Corrective maintenance on 12/17/2004 corrected this offset.  It is not 
clear which CM action corrected the problem since the DS instrument cable was grounded to 
a new location and the DS ventilator fan was found in poor condition and was replaced.  
Either of these issues could have led to the problem observed in this instrument.
Measurements:sgpbrs20sC1.a0:
  • Instantaneous Downwelling Hemispheric Shortwave, Unshaded Pyranometer Thermopile
    Voltage(inst_global)

sgpbrsC1.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)

sgpbrsC1.b1:
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Maxima(down_short_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Standard
    Deviation(down_short_hemisp_std)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Minima(down_short_hemisp_min)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer(down_short_hemisp)


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DQRID : D060630.7
Start DateStart TimeEnd DateEnd Time
12/11/2003193502/16/20061903
Subject:
SGP/BRS/C1 - Reprocessed: Longwave Calibration error
DataStreams:sgpbrsC1.b1
Description:
Modified pyrgeometer calibration procedures were implemented beginning in June 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 November 2006.
Measurements:sgpbrsC1.b1:
  • Downwelling Longwave Hemispheric Net Infrared(down_long_netir)
  • Upwelling (10 meter) Longwave Hemispheric Irradiance, Ventilated Pyrgeometer(up_long_hemisp)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
  • Upwelling Longwave Hemispheric Net Infrared(up_long_netir)


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DQRID : D061102.1
Start DateStart TimeEnd DateEnd Time
12/11/2003192006/14/20042359
Subject:
SGP/BRS/C1 - Reprocess: Calibration error in Downwelling Longwave measurement
DataStreams:sgpbrsC1.b1, sgpbrs20sC1.a0
Description:
On 20031211 the Downwelling LW pyrgeometer was replaced but the calibrations were not 
updated.  Calibrations have been corrected in data beginning 20040615.
Measurements:sgpbrs20sC1.a0:
  • Instantaneous Downwelling Pyrgeometer Thermopile Voltage, Shaded Pyrgeometer(inst_down_long_hemisp_shaded_tp)

sgpbrsC1.b1:
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Maxima(down_long_hemisp_shaded_max)
  • Downwelling Longwave Hemispheric Net Infrared(down_long_netir)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer(down_long_hemisp_shaded)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Minima(down_long_hemisp_shaded_min)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer, Standard
    Deviation(down_long_hemisp_shaded_std)


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