Data Quality Reports for Session: 137392 User: ee05028 Completed: 09/15/2011

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D100325.1SGP/SIRS/E9 - Downwelling SW sensor alignment/levelsgpsirsE9.b1, sgpsirs20sE9.a0


DQRID : D100325.1
Start DateStart TimeEnd DateEnd Time
08/18/2009162503/16/20101518
Subject:
SGP/SIRS/E9 - Downwelling SW sensor alignment/level
DataStreams:sgpsirsE9.b1, sgpsirs20sE9.a0
Description:
On clear days, the down_short_hemisp data (PSP instrument) exhibit asymmetry in its daily 
output curve especially when compared to derived downwelling shortwave.  Ops corrected 
the problem by re-leveling the PSP on 3/16/2010. The issue may likely be due to a slowly 
sinking platform at this site or inadvertent loosening of instrument hold down screws.  

Problem may have developed slowly over the last year.  Corrections are not easily 
quantifiable.  Suggest using derived downwelling shortwave which is not dependent on the PSP 
instrument:

derived DS = down_short_diffuse + short_direct_normal * cos(zenith angle)
Measurements:sgpsirs20sE9.a0:
  • inst_global
sgpsirsE9.b1:
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
  • down_short_hemisp_std

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