DQRID : D090715.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
07/12/2009064207/16/20090746Suspect
more
Subject:
GRW/SKYRAD/M1 - Possible dirty dome
DataStreams:grwskyrad60sM1.b1, grwskyrad20sM1.a0
Description:
The difference between downwelling shortwave hemispheric irradiance and derived 
downwelling shortwave hemispheric irradiance was larger than normal (>50W/m2) and was most 
noticeable at lower zenith angles.  The problem spontaneously resolved itself on 7/16 without any 
specific callouts by the GRW cleaning personnel on their reports.  Short_direct_normal 
datastream is suspected to be low due to potentially dirty NIP instrument window during 
this time period.  The commencement of this problem corresponds with a rain event early 
7/12. The possibility of other radiometers affected by dirty domes is also possible. 
Longwave instruments are typically immune to this level of contamination.
Suggestions: 
Measurements:grwskyrad20sM1.a0:
  • inst_global
  • inst_diffuse
  • inst_direct_normal
more
grwskyrad60sM1.b1:
  • down_short_diffuse_hemisp_std
  • short_direct_normal_min
  • down_short_hemisp_min
  • down_short_hemisp
  • down_short_diffuse_hemisp_max
  • short_direct_normal
  • down_short_diffuse_hemisp_min
  • down_short_diffuse_hemisp
  • short_direct_normal_std
  • short_direct_normal_max
  • down_short_hemisp_max
  • down_short_hemisp_std
more

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