AIRS/Aqua L2 CO2 support retrieval (AIRS-only) V005 (AIRS2SPC) at GES DISC

The Atmospheric Infrared Sounder (AIRS) is a grating spectrometer (R = 1200) aboard the second Earth Observing System (EOS) polar-orbiting platform, EOS Aqua. In combination with the Advanced Microwave Sounding Unit (AMSU) and the Humidity Sounder for Brazil (HSB), AIRS constitutes an innovative atmospheric sounding group of visible, infrared, and microwave sensors. The AIRS Support Products include higher vertical resolution profiles of the quantities found in the Standard Product plus intermediate output (e.g., microwave-only retrieval), research products such as the abundance of trace gases, and detailed quality assessment information. The Support Product profiles contain 100 pressure levels between 1100 and .016 mb. An AIRS granule has been set as 6 minutes of data. This normally corresponds to approximately 1/15 of an orbit but exactly 45 scanlines of AMSU-A data or 135 scanlines of AIRS and HSB data. The Level 2 retrieval products and climatology CO2 are assumed as the initial state for the Vanishing Partial Derivative (VPD) retrieval algorithm that separately determines the tropospheric CO2 mixing ratio. The AIRS Level 2 tropospheric CO2 product is the average of the solutions for a 2 x 2 array of adjacent AIRS Level 2 retrieval spots, covering a 90 km x 90 km area at nadir. Retrievals for which the solutions for the 2 x 2 arrays satisfy a spatial coherence QA that requires agreement of the separate retrievals to be within 2 ppm in an RMS sense are included in the standard product. Retrievals that fail this QA test are included in the support product.

Data and Resources

Additional Info

Field Value
Maintainer ED ESFANDIARI
Last Updated July 17, 2025, 16:10 (UTC)
Created March 31, 2025, 20:42 (UTC)
accessLevel public
bureauCode {026:00}
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citation AIRS Science Team/Moustafa Chahine. 2010-01-01. AIRS2SPC. Version 005. AIRS/Aqua L2 CO2 support retrieval (AIRS-only) V005. Greenbelt, MD, USA. Archived by National Aeronautics and Space Administration, U.S. Government, Goddard Earth Sciences Data and Information Services Center (GES DISC). https://disc.gsfc.nasa.gov/datacollection/AIRS2SPC_005.html. Digital Science Data.
creator AIRS Science Team/Moustafa Chahine
data-presentation-form Digital Science Data
graphic-preview-file https://docserver.gesdisc.eosdis.nasa.gov/public/project/Images/AIRS2SPC_005.png
harvest_object_id fd88c69e-130c-414d-980d-8eedafb6b37c
harvest_source_id 61638e72-b36c-4866-9d28-551a3062f158
harvest_source_title DNG Legacy Data
identifier C1243477370-GES_DISC
issued 2010-01-01
landingPage https://cmr.earthdata.nasa.gov:443/search/concepts/C1243477370-GES_DISC.html
language {en-US}
metadata_type geospatial
modified 2017-03-01
programCode {026:001}
publisher NASA/GSFC/SED/ESD/GCDC/GESDISC
release-place Greenbelt, MD, USA
resource-type Dataset
series-name AIRS2SPC
source_datajson_identifier true
source_hash e7efce01e6e8cc8cd6c8af2e052fcfce14abcf09c287c8e716700f8ff334e19d
source_schema_version 1.1
spatial -180.0 -90.0 180.0 90.0
temporal 2010-01-01T00:00:00Z/2022-01-17T00:00:00Z
theme {Aqua,geospatial}