Sounder SIPS: Suomi NPP CrIMSS Level 2 CLIMCAPS Full Spectral Resolution: Cloud Cleared Radiances V2 at GES DISC

Description

The CLIMCAPS (Community Long-term Infrared Microwave Coupled Product System) algorithm is used 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/ATMS instruments used for this product are on board the Suomi National Polar-orbiting Partnership (SNPP) platform and use the Full Spectral Resolution (FSR) data. The CrIS instrument is a Fourier transform spectrometer with a total of 2211 NSR infrared sounding channels covering the longwave (645-1095 cm-1), midwave (1210-1750 cm-1), and shortwave (2000-2550 cm-1) spectral regions. The ATMS instrument is a cross-track scanner with 22 channels in spectral bands from 23 GHz through 183 GHz. Cloud clearing is the process of computing the clear column radiance for a given channel n, and represents what the channel would have observed if the entire scene were cloud free. The entire scene is defined as the ATMS field of regard (FOR) which includes and array of 3x3 CrIS field of views (FOV). The basic assumption of cloud-clearing is that if the observed radiances in each field-of-view are different, the differences in the observed radiances are solely attributed to the differences in the fractional cloudiness in each field of view while everything else (surface properties and atmospheric state) is uniform across the field of regard. A level 2 granule has been set as 6 minutes of data, 30 footprints cross track by 45 lines along track. There are 240 granules per day, with an orbit repeat cycle of approximately 16 day. The CLIMCAPS algorithm uses data from the second Modern-Era Retrospective analysis for Research and Applications (MERRA-2) as a first-guess for the atmospheric state. Because MERRA-2 products typically have a latency from 3 to 7 weeks, so too do the CLIMCAPS products.

Resources

Name Format Description Link
21 Search results for publications that cite this dataset by its DOI. https://scholar.google.com/scholar?q=10.5067%2FATJX1J10VOMU
21 Access the data via HTTPS. https://sounder.gesdisc.eosdis.nasa.gov/data/SNPP_Sounder_Level2/SNDRSNIML2CCPCCR.2/
21 Access the data via the OPeNDAP protocol. https://sounder.gesdisc.eosdis.nasa.gov/opendap/SNPP_Sounder_Level2/SNDRSNIML2CCPCCR.2/
21 Search the Earthdata website https://search.earthdata.nasa.gov/search?q=SNDRSNIML2CCPCCR_2
33 CLIMCAPS L2 Product User Guide:File Format and Definition https://docserver.gesdisc.eosdis.nasa.gov/public/project/Sounder/CLIMCAPS.V2.README.pdf
33 Product quality assessment guide https://docserver.gesdisc.eosdis.nasa.gov/public/project/Sounder/CLIMCAPS.V2.Test.Report.pdf
33 CLIMCAPS Science Application Guide https://docserver.gesdisc.eosdis.nasa.gov/public/project/Sounder/CLIMCAPS_V2_L2_science_guides.pdf
33 CLIMCAPS ATBD https://docserver.gesdisc.eosdis.nasa.gov/public/project/Sounder/CLIMCAPS.V1.ATBD.pdf
21 Access the dataset landing page from the GES DISC website. https://disc.gsfc.nasa.gov/datacollection/SNDRSNIML2CCPCCR_2.html
34 Sample plot of CrIS/ATMS CLIMCAPS FSR Cloud Cleared Radiances. https://docserver.gesdisc.eosdis.nasa.gov/public/project/Images/SNDRSNIML2CCPCCR_2.png

Tags

  • infrared-wavelengths
  • spectral-engineering
  • microwave
  • earth-science

Topics

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