Journal
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
Volume 113, Issue 11, Pages 1391-1408Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jqsrt.2012.02.036
Keywords
Infrared spectroscopy; Radiative transfer; IASI; Trace gases
Categories
Funding
- CNES
- F.R.S.-FNRS [M.I.S. nF.4511.08]
- Belgian State Federal Office for Scientific, Technical and Cultural Affairs
- European Space Agency (ESA) [C90-327]
- Actions de Recherche Concertees (Communaute Francaise de Belgique)
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This paper lays down the theoretical bases and the methods used in the Fast Optimal Retrievals on Layers for IASI (FORLI) software, which is developed and maintained at the Universite Libre de Bruxelles (ULB) with the support of the Laboratoire Atmospheres, Milieux, Observations Spatiales (LATMOS) to process radiance spectra from the Infrared Atmospheric Sounding Interferometer (IASI) in the perspective of local to global chemistry applications. The forward radiative transfer model (RTM) and the retrieval approaches are formulated and numerical approximations are described. The aim of FORLI is near-real-time provision of global scale concentrations of trace gases from IASI, either integrated over the altitude range of the atmosphere (total columns) or vertically resolved. To this end, FORLI uses precalculated table of absorbances. At the time of writing three gas-specific versions of this algorithm have been set up: FORLI-CO, FORLI-O-3 and FORLI-HNO3. The performances of each are reviewed and illustrations of results and early validations are provided, making the link to recent scientific publications. In this paper we stress the challenges raised by near-real-time processing of IASI, shortly describe the processing chain set up at ULB and draw perspectives for future developments and applications. (C) 2012 Elsevier Ltd. All rights reserved.
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