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Midtropospheric CO 2 concentration retrieval from AIRS observations in the tropics
Author(s) -
Crevoisier C.,
Heilliette S.,
Chédin A.,
Serrar S.,
Armante R.,
Scott N. A.
Publication year - 2004
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2004gl020141
Subject(s) - atmospheric infrared sounder , environmental science , atmospheric sciences , altitude (triangle) , tropics , carbon dioxide , atmosphere (unit) , carbon dioxide in earth's atmosphere , climatology , meteorology , geology , troposphere , chemistry , geography , geometry , mathematics , organic chemistry , fishery , biology
Midtropospheric carbon dioxide (CO 2 ) concentration is retrieved in the tropics [20S:20N], over sea, at night, for the period April to October 2003 from the Atmospheric Infrared Sounder (AIRS) observations. The method relies on a non‐linear regression inference scheme using neural networks. A rough estimate of the mean precision of the method is about 2.5 ppmv (0.7%). The retrieved seasonal cycle and its latitudinal dependence agree well with aircraft CO 2 in situ measurements made at the same altitude range. Maps produced on a monthly basis at a resolution of 15° × 15°, although not yet fully understood, show good agreement with known characteristics of CO 2 distribution reflecting both atmospheric transport and surface fluxes (fossil fuel emissions, biomass burning, air‐surface gas exchanges).