DQRID : D070530.1
Start DateStart TimeEnd DateEnd Time
05/29/2007200605/31/20071752
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Subject:
SGP/SIRS/E5 - Reprocess: Incorrect shortwave calibration coefficients
DataStreams:sgpsirsE5.b1, sgpsirs20sE5.a0
Description:
Following a 13 day outage, data collection resumed with incorrect calibration coefficients 
for the shortwave instruments.  The correct calibrations were applied beginning 20070531 
at 1752GMT.  Longwave data were unaffected.

To back out data with incorrect shortwave cal coefficients perform the following 
conversions on each 1 minute data element:
Downwelling Diffuse Shortwave (8-48): DD(cor) = DD*(113.61/113.56)
Upwelling Shortwave :  US(cor) = US*(115.72/112.78)
Direct Normal : DN(cor) = DN * (121.56/120.14)
Downwelling Shortwave : DS(cor) = DS * (121.73/120.87)
Suggestions: 
Avoid all SW data during specified time period until reprocessed data are available.
Measurements:sgpsirsE5.b1:
  • Downwelling shortwave diffuse hemispheric irradiance, pyranometer, maxima(down_short_diffuse_hemisp_max)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
  • 25 meter Upwelling Shortwave Hemispheric Irradiance, Pyranometer(up_short_hemisp)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Pyranometer, Standard
    Deviation(down_short_diffuse_hemisp_std)
  • Upwelling (10 meter) Shortwave Hemispheric Irradiance, Ventilated Pyranometer,
    Standard Deviation(up_short_hemisp_std)
  • Shortwave Direct Normal Irradiance, Pyrgeometer, Standard Deviation(short_direct_normal_std)
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Minima(down_short_hemisp_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • Downwelling shortwave hemispheric irradiance, pyranometer, maxima(down_short_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Standard
    Deviation(down_short_hemisp_std)
  • Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer, Maxima(up_short_hemisp_max)
  • Shortwave direct normal irradiance, pyrheliometer(short_direct_normal)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Pyrgeometer, Minima(down_short_diffuse_hemisp_min)
  • Shortwave direct normal irradiance, pyrheliometer, minima(short_direct_normal_min)
  • Upwelling shortwave hemispheric irradiance, pyranometer, minima(up_short_hemisp_min)
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
more
sgpsirs20sE5.a0:
  • Instantaneous Downwelling Hemispheric Shortwave, Pyranometer Thermopile Voltage(inst_global)
  • Instantaneous uncorrected downwelling shortwave diffuse, shaded pyranometer
    thermopile voltage(inst_diffuse)
  • Instantaneous Upwelling Shortwave Hemispheric Irradiance, Pyranometer(inst_up_short_hemisp)
  • Instantaneous direct normal shortwave irradiance, pyrheliometer thermopile
    voltage(inst_direct_normal)
more

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