期刊
GEOPHYSICAL RESEARCH LETTERS
卷 31, 期 17, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2004GL020141
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Midtropospheric carbon dioxide (CO2) 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 CO2 in situ measurements made at the same altitude range. Maps produced on a monthly basis at a resolution of 15degrees x 15degrees, although not yet fully understood, show good agreement with known characteristics of CO2 distribution reflecting both atmospheric transport and surface fluxes ( fossil fuel emissions, biomass burning, air-surface gas exchanges).
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