Data Quality Reports for Session: 104846 User: hew-essc Completed: 03/19/2007


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060112.4NIM/SKYRAD/M1 - IRTs do not agree with AERInimskyrad60sM1.b1
D060222.1NIM/SKYRAD/M1 - Instrument ventilator problemnimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1


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/Cloud Infra-Red Temperature(sky_ir_temp)
  • Sky/Cloud Infra-Red Temperature Minima(sky_ir_temp_min)
  • Sky/Cloud Infra-Red Temperature Maxima(sky_ir_temp_max)


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DQRID : D060222.1
Start DateStart TimeEnd DateEnd Time
12/23/2005000002/23/20060800
Subject:
NIM/SKYRAD/M1 - Instrument ventilator problem
DataStreams:nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1
Description:
Data quality office first reported that PIR1 and PIR2 appear to be deviating more than 
typical during the daylight hours.  It was found that the Skyrad PIR ventilator fans were 
building up debris on the intake air filter.  Obstructed air flow results in solar heating 
of the PIR ventilator housing in the later part of the day and biasing the incomming IR 
irradiance values. The slow buildup was insidious and wasn't discovered and corrected 
(i.e. ventilator fans cleaned on a regular and frequent basis) until Feb 23rd. On or around 
December 23rd was when this problem may have first started.  We are unable to quantify the 
extent of the problem in W/m2.  Normal deviation between PIRs is typically 3-5 W/m2.
Measurements:nimskyrad20sM1.a0:
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
    Pyrgeometer2(inst_down_long_shaded2_dome_resist)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Shaded Pyrgeometer1(inst_down_long_hemisp_shaded1_tp)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Resistance, Shaded
    Pyrgeometer1(inst_down_long_shaded1_dome_resist)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Shaded Pyrgeometer2(inst_down_long_hemisp_shaded2_tp)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
    Pyrgeometer1(inst_down_long_shaded1_case_resist)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Resistance, Shaded
    Pyrgeometer2(inst_down_long_shaded2_case_resist)

nimskyrad60sM1.b1:
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1(down_long_hemisp_shaded1)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Maxima(down_long_hemisp_shaded2_max)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Minima(down_long_hemisp_shaded1_min)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Shaded Pyrgeometer2(inst_down_long_hemisp_shaded2_tp)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Standard
    Deviation(down_long_hemisp_shaded2_std)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Standard
    Deviation(down_long_hemisp_shaded1_std)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer1, Maxima(down_long_hemisp_shaded1_max)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Temperature, Shaded
    Pyrgeometer2(inst_down_long_shaded2_dome_temp)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2, Minima(down_long_hemisp_shaded2_min)
  • Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2(down_long_hemisp_shaded2)
  • Instantaneous Downwelling Pyrgeometer Dome Thermistor Temperature, Shaded
    Pyrgeometer1(inst_down_long_shaded1_dome_temp)
  • Instantaneous Downwelling Pyrgeometer Thermopile, Shaded Pyrgeometer1(inst_down_long_hemisp_shaded1_tp)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Temperature, Shaded
    Pyrgeometer2(inst_down_long_shaded2_case_temp)
  • Instantaneous Downwelling Pyrgeometer Case Thermistor Temperature, Shaded
    Pyrgeometer1(inst_down_long_shaded1_case_temp)

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


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