Evaluation of different calibration approaches for S-NPP CRIS full spectral resolution SDR processing

The Cross-track Infrared Sounder (CrIS) on Suomi National Polar-orbiting Partnership Satellite (S-NPP) is a Fourier transform spectrometer and provides a total of 1305 and 2211 channels in normal spectral resolution (NSR) mode and full spectral resolution (FSR) mode, respectively, for sounding the atmosphere. NOAA operated CrIS in FSR mode on December 4, 2014 for S-NPP, and will operate CrIS in FSR mode for the Joint Polar Satellite System (JPSS). Based on CrIS Algorithm Development Library (ADL), CrIS full resolution processing system (CRPS) has been developed to generate the FSR Sensor Data Record (SDR). This code can also be run for normal mode and truncation mode SDRs. In order to select the best calibration algorithm for JPSS-1, four different calibration approaches are being implemented in the ADL full resolution code. In this study, evaluation results from different calibration approaches are presented and the ringing features observed in CrIS unapodized spectra are discussed.