NPP and N20 CrIS Full Spectral Resolution Detector Differences Derived from the NCEP Global Data Assimilation System

Most NWP Centers assume the nine CrIS detectors are identical. One bias correction and observation error is typically applied to all of the detectors. If the detector differences are large and not accounted for, they may be interpreted as signal by the assimilation system and incorporated into the model analysis/initialization. This poster quantifies the CrIS-FSR bias and standard deviation differences from the NCEP Global Data Assimilation System. This information can then be used to determine if specific detectors should have different observation errors or, in extreme cases, reject data from specific detectors.