Data Quality Reports for Session: 130359 User: vghate Completed: 09/18/2010


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060112.4NIM/SKYRAD/M1 - IRTs do not agree with AERInimskyrad60sM1.b1
D060630.42NIM/GNDRAD/M1 - Reprocessed: Longwave calibration errornimgndrad60sM1.b1
D061006.1NIM/SKYRAD/M1 - Tracker inoperativenimskyrad20sM1.a0, nimskyrad60sM1.b1, nimskyradM1.00


DQRID : D060112.4
Start DateStart TimeEnd DateEnd Time
11/26/2005000006/07/20061900
Subject:
NIM/SKYRAD/M1 - IRTs do not agree with AERI
DataStreams:nimskyrad60sM1.b1
Description:
Since deployment at PYE, and then at NIM, the AMF SKYRAD IRT measured about 10K higher sky 
temperatures than the AERI and the MWRP IRT measureed about 20K higher than the AERI.  
Several actions were taken to diagnose the problem including confirming the correct 
configuration of the IRTs and data logger, cleaning the mirror and lens, and replacing the mirror.

After several days of rain beginning 6/2/2006, the three instruments came into agreement. 
It is unknown whether this was a problem with the AERI, MWRP-IRT or SKYRAD-IRT.
Measurements:nimskyrad60sM1.b1:
  • Sky Infra Red Temperature Minima(sky_ir_temp_min)
  • Sky Infra-Red Temperature(sky_ir_temp)
  • Sky Infra Red Temperature Maxima(sky_ir_temp_max)


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DQRID : D060630.42
Start DateStart TimeEnd DateEnd Time
11/25/2005170012/22/20051100
Subject:
NIM/GNDRAD/M1 - Reprocessed: Longwave calibration error
DataStreams:nimgndrad60sM1.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 February 2007.
Measurements:nimgndrad60sM1.b1:
  • Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)


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DQRID : D061006.1
Start DateStart TimeEnd DateEnd Time
09/12/2006120010/05/20061330
Subject:
NIM/SKYRAD/M1 - Tracker inoperative
DataStreams:nimskyrad20sM1.a0, nimskyrad60sM1.b1, nimskyradM1.00
Description:
Starting on 9/12 the NIM radiometer tracker drifted enough due to sinking supports and a 
drifting clock that the direct normal measurments (NIP) and the downwelling hemispheric 
diffuse shortwave measurments (8-48) were adversely affected in the afternoon hours.  The 
shortwave hemispheric global instrument (PSP) and downelling hemispheric longwave shaded1 
and shaded2 (PIR) are unaffected by this problem. 

The tracker problem greatly affected direct measurements and affected the diffuse 
measurement to a lesser extent. There are no redundant measurements for these instruments.  
However, during this time range the data collected before local noon (aprox 1140GMT) for all 
shortwave Skyrad instruments appear to be good.
Measurements:nimskyrad20sM1.a0:
  • Instantaneous Uncorrected Downwelling Shortwave Diffuse, Shaded Pyranometer
    Thermopile Voltage(inst_diffuse)
  • Instantaneous Direct Normal Shortwave Irradiance, Pyheliometer Thermopile
    Voltage(inst_direct_normal)

nimskyrad60sM1.b1:
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Standard Deviation(down_short_diffuse_hemisp_std)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Minima(short_direct_normal_min)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Standard Deviation(short_direct_normal_std)
  • Shortwave Direct Normal Irradiance, Pyrgeometer(short_direct_normal)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Minima(down_short_diffuse_hemisp_min)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Maxima(short_direct_normal_max)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer,
    Maxima(down_short_diffuse_hemisp_max)

nimskyradM1.00:
  • null(Raw data stream - documentation not supported)


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