Sounder SIPS: JPSS-1 CrIS Level 2 CLIMCAPS: Atmosphere cloud and surface geophysical state V2 (SNDRJ1IML2CCPRET) at GES DISC

Description

WARNING: To users of the derived product “co_mmr_midtrop” (carbon monoxide mass mixing ratio to dry air [kg/kg] at ~500 hPa). This variable has a significant bias due to a conversion error: the molecular weight of carbon dioxide (CO2, 44.01 g/mol) was used instead of carbon monoxide (CO, 28.01 g/mol). To correct, simply multiply “co_mmr_midtrop” by 28.01/44.01. Alternatively, derive a profile of mass mixing ratio from scratch using the retrieved column density values (“mol_lay/co_mol_lay”) in the Level 2 files. For further questions or concerns please contact the Sounder SIPS at: sounder.sips@jpl.nasa.gov 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 NOAA-20 platform, also known as JPSS-1. The CrIS instrument is a Fourier transform spectrometer with a total of 2211 FSR (Full Spectral Resolution) infrared sounding channels covering the longwave (645-1095 cm-1), midwave (1210-1750 cm-1), and shortwave (2100-2550 cm-1) spectral regions. The ATMS instrument is a cross-track scanner with 22 channels in spectral bands from 23 GHz through 183 GHz. The CLIMCAPS algorithm uses an Optimal Estimation methodology and uses an a-priori first guess to start the process. A CLIMCAPS sounding is comprised of a set of parameters that characterizes the full atmospheric state and includes a variety of geophysical parameters derived from the CrIMSS data. These include surface temperature and infrared emissivity; full atmosphere profiles of temperature, water vapor and ozone; infrared effective cloud top characteristics; carbon monoxide, methane, carbon dioxide, sulfur dioxide, nitrous oxide, and nitric acid. 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. 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.

Resources

Name Format Description Link
21 Access the dataset landing page from the GES DISC website. https://disc.gsfc.nasa.gov/datacollection/SNDRJ1IML2CCPRET_2.html
21 Access the data via the OPeNDAP protocol. https://sounder.gesdisc.eosdis.nasa.gov/opendap/JPSS1_Sounder_Level2/SNDRJ1IML2CCPRET.2/
21 Search the Earthdata website. https://search.earthdata.nasa.gov/search?q=SNDRJ1IML2CCPRET+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 CLIMCAPS ATBD https://docserver.gesdisc.eosdis.nasa.gov/public/project/Sounder/CLIMCAPS.V1.ATBD.pdf
33 Product quality assessment guide https://docserver.gesdisc.eosdis.nasa.gov/public/project/Sounder/CLIMCAPS.V2.Test.Report.pdf
21 CLIMCAPS Science Application Guide (Digital version) https://airs.jpl.nasa.gov/data/guides-docs/climcaps-science/
33 CLIMCAPS Science Application Guide https://docserver.gesdisc.eosdis.nasa.gov/public/project/Sounder/CLIMCAPS_V2_L2_science_guides.pdf
21 Search results for publications that cite this dataset by its DOI. https://scholar.google.com/scholar?q=10.5067%2FLESQUBLWS18H
34 Sample plot of NOAA-20 (JPSS-1) CrIS/ATMS CLIMCAPS Level 2 Retrieval. https://docserver.gesdisc.eosdis.nasa.gov/public/project/Images/SNDRJ1IML2CCPRET_2.png
21 Access the data via HTTPS. https://sounder.gesdisc.eosdis.nasa.gov/data/JPSS1_Sounder_Level2/SNDRJ1IML2CCPRET.2/

Tags

  • atmospheric-radiation
  • precipitation
  • altitude
  • land-surface
  • atmospheric-water-vapor
  • oceans
  • atmosphere
  • atmospheric-temperature
  • atmospheric-chemistry
  • ocean-temperature
  • air-quality
  • surface-radiative-properties
  • atmospheric-pressure
  • surface-thermal-properties
  • clouds
  • earth-science

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