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Spectral calibration and validation of the Cross‐track Infrared Sounder on the Suomi NPP satellite
Author(s) -
Strow L. Larrabee,
Motteler Howard,
Tobin David,
Revercomb Henry,
Han Scott,
Buijs Henry,
Predina Joe,
Suwinski Lawrence,
Glumb Ronald
Publication year - 2013
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1002/2013jd020480
Subject(s) - calibration , remote sensing , apodization , satellite , detector , environmental science , infrared , track (disk drive) , radiometric calibration , optics , stability (learning theory) , physics , computer science , geology , quantum mechanics , astronomy , machine learning , operating system
The Cross‐track Infrared Sounder (CrIS) radiometric accuracy depends upon accurate frequency calibration. Here we present both the prelaunch calibration of the sensor and the minor modifications needed to this calibration post launch. Particular emphasis is given to ensuring that all nine detectors on each of the three CrIS focal planes are on a common frequency scale with accurate off‐axis apodization corrections. Radiances from the current operational algorithm have a frequency calibration that is stable to 2 ppm, although this work suggests that the CrIS instrument is capable of a frequency calibration stability of better than 1 ppm.