DQRID : D050420.4
Start DateStart TimeEnd DateEnd Time
08/03/2000133008/15/20011500
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Subject:
SGP/SIRS/E13 - Adjust Direct Normal Irradiance
DataStreams:sgpsirsE13.01, sgpsirsE13.00, sgp1swfanalsirs1longE13.c1, sgp15swfanalsirs1longE13.c1
Description:
Direct normal broadband shortwave irradiance measured by NIP s/n 30585E6 was found to have 
a 1.76% negative bias when compared in-situ with absolute cavity radiometer measurements 
taken on August 21, 2000.  The estimated measurement uncertainty of the calibration of 
NIP s/n 30585E6 on July 18, 2000 was -2.2% to +2.8%.  

Data from NIP s/n 30585E6 can be adjusted according to the in-situ comparisons to reduce 
the apparent measurement bias.
Suggestions: 
Multiply all direct normal irradiance measurements by 1.0176.
Measurements:sgp15swfanalsirs1longE13.c1:
  • Measured Downwelling Direct Shortwave Irradiance (dir)(dirfluxdn_measured)
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sgpsirsE13.00:
  • (Raw data stream - documentation not supported)
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sgp1swfanalsirs1longE13.c1:
  • Measured Downwelling Direct Shortwave Irradiance (dir)(dirfluxdn_measured)
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sgpsirsE13.01:
  • (Raw data stream - documentation not supported)
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