DQRID : D080627.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
08/01/2007000007/01/20081500Suspect
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Subject:
SGP/SIRS/E21 - Ventilator Fan Failure
DataStreams:sgpsirsE21.00, sgpsirsE21.b1, sgpsirs20sE21.a0
Description:
Start time is uncertain due to length of time this problem existed.  During the time frame 
specified the PSP (down_short_hemisp) and 8-48 (down_short_diffuse_hemisp) ventilator 
fans failed. PM replaced the fans 7/1/2008 1500. 
Ventilator failure does adversely affect thermopile radiometer measurements but the extent 
has not been quantified. The 8-48 is significantly less affected than the PSP. Mentor 
suggests using component sum method detailed in SIRS
instrument handbook where down_short_hemisp = down_short_diffuse +
short_direct_normal * cos (zenith angle) for each time record.
Suggestions: 
Use down_short_hemisp and down_short_diffuse_hemisp with discretion or apply 

component sum method to generate down_short_hemisp using down_short_diffuse_hemisp and 
short_direct_normal since down_short_diffuse_hemisp is less affected by this failure mode.
Measurements:sgpsirs20sE21.a0:
  • inst_diffuse
  • inst_global
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sgpsirsE21.00:
  • Raw data stream - documentation not supported
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sgpsirsE21.b1:
  • down_short_diffuse_hemisp_max
  • down_short_hemisp
  • down_short_diffuse_hemisp
  • down_short_hemisp_std
  • down_short_hemisp_max
  • down_short_hemisp_min
  • down_short_diffuse_hemisp_min
  • down_short_diffuse_hemisp_std
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