DQRID : D080701.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
06/25/2008173607/10/20081530Does not affect quality
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Subject:
SGP/SIRS/E5 - Incorrect Calibration Coefficient
DataStreams:sgpsirsE5.b1, sgpsirsE5.00, sgpsirs20sE5.a0
Description:
When instruments were changed out on 6/25 the UIR (up_long_hemisp measurement) S/N and cal 
coefficient reverted to a previous UIR instrument that was damaged and removed on 
12/28/2007. The UIR S/N should be 31637F3 with corresponding cal K=.2526 instead of applied 
value of K=.2571. 
However, for the PIR longwave instrument in this inverted position (UIR) the K1 term 
contributes approximately 0-7% of the total upwelling longwave signal throughout the day, or 
about 0-30 W/m2.  The cal coefficient is too high by approximately 2%. Thus, the UIR data, 
as is, ranges from 0 to .6 W/m2 too low since this term is always negative.  The 
uncertainty of this instrument is approximately +-10 W/m2 with respect to the WSIG. Reprocessing 
is not recommended.
Suggestions: 
No changes or reprocessing is recommended.  Users are directed to the SIRS instrument 

handbook for information on reproccessing this data using the original raw data if 
desired.
Measurements:sgpsirsE5.b1:
  • up_long_hemisp_max
  • up_long_netir
  • up_long_hemisp_std
  • up_long_hemisp_min
  • up_long_hemisp
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sgpsirs20sE5.a0:
  • inst_up_long_hemisp_tp
  • inst_up_long_dome_resist
  • inst_up_long_case_resist
more
sgpsirsE5.00:
  • Raw data stream - documentation not supported
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