Sounder SIPS: Suomi NPP CrIMSS Level 2 CLIMCAPS Full Spectral Resolution: Atmosphere cloud and surface geophysical state V2 at GES DISC

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 FSR 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.

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.

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.

Data and Resources

Additional Info

Field Value
Maintainer Lena Iredell
Last Updated March 31, 2025, 13:59 (UTC)
Created March 31, 2025, 13:59 (UTC)
accessLevel public
bureauCode {026:00}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_@id https://data.nasa.gov/data.json
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
citation Chris Barnet. 2019-01-15. SNDRSNIML2CCPRET. Version 2. Sounder SIPS: Suomi NPP CrIMSS Level 2 CLIMCAPS Full Spectral Resolution: Atmosphere cloud and surface geophysical state V2. Greenbelt, MD, USA. Archived by National Aeronautics and Space Administration, U.S. Government, Goddard Earth Sciences Data and Information Services Center (GES DISC). https://doi.org/10.5067/62SPJFQW5Q9B. https://disc.gsfc.nasa.gov/datacollection/SNDRSNIML2CCPRET_2.html. Digital Science Data.
creator Chris Barnet
data-presentation-form Digital Science Data
graphic-preview-description Sample plot of CrIS/ATMS CLIMCAPS Level 2 retrieval.
graphic-preview-file https://docserver.gesdisc.eosdis.nasa.gov/public/project/Images/SNDRSNIML2CCPRET_2.png
harvest_object_id a30216cb-a67b-45d4-8f2d-1659bc08555e
harvest_source_id 61638e72-b36c-4866-9d28-551a3062f158
harvest_source_title DNG Legacy Data
identifier C1692982075-GES_DISC
issued 2015-11-02
landingPage https://doi.org/10.5067/62SPJFQW5Q9B
language {en-US}
metadata_type geospatial
modified 2021-05-21
programCode {026:001}
publisher Not provided
references {https://doi.org/DOI%20%2010.3390/rs11101227,https://doi.org/10.1109/TGRS.2012.2220369,https://doi.org/10.1016/S0022-4073(97)00169-6,https://doi.org/10.1109/TGRS.2002.808236,https://doi.org/10.1029/2005/JD007020,https://doi.org/10.5194/amt-13-4437-2020}
release-place Greenbelt, MD, USA
resource-type Dataset
series-name SNDRSNIML2CCPRET
source_datajson_identifier true
source_hash 7dd8c86edab525505561ee38287f030a9ef0804d0f94a8867d9b48a6ebee9892
source_schema_version 1.1
spatial -180.0 -90.0 180.0 90.0
temporal 2015-11-02T00:00:00Z/2022-01-17T00:00:00Z
theme {SUOMI-NPP,geospatial}