Short Name:

Cross-track Infrared Sounder (CrIS) Level 2 Earth System Science Profiling Algorithm Ammonia Retrieval Algorithm (ESSPA-NH3) V1 (SNDRSNIL2ESPNH3)

The objective of this limited edition data collection is to examine ammonia products generated by the ESSPA (Earth System Science Profiling Algorithm) algorithm to analyze data from the Cross-track Infrared Sounder/Advanced Technology Microwave Sounder (CrIS/ATMS) instruments, also known as CrIMSS (Cross-track Infrared and Microwave Sounding Suite). The CrIS instrument used for this product is on board the Suomi National Polar-orbiting Partnership (SNPP) platform and use the Normal Spectral Resolution (NSR) data. The CrIS instrument is a Fourier transform spectrometer with a total of 1305 NSR infrared sounding channels covering the longwave (655-1095 cm-1), midwave (1210-1750 cm-1), and shortwave (2155-2550 cm-1) spectral regions. The L2 ammonia algorithm is developed to run with with ESSPA system and is based off of an AER (Atmospheric and Environmental Research, Inc.) program initially developed to process heritage TES (Tropospheric Emissions Spectrometer) trace gas products. This ammonia algorithm uses an Optimal Estimation regularization with sequential processing. The a-prioi include temperature and water from the AER product, and a trace gas climatology. The algorithm produces ammonia and single field of view CO. \n\nA level 2 granule has been set as 6 minutes of data, 30 footprints crosstrack by 45 lines along track. There are 240 granules per day, with an orbit repeat cycle of approximately 16 day.

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