Abstract
A physical retrieval algorithm was developed for the Infrared Atmospheric Sounder Interferometer (IASI), which was launched on board of the METOP A satellite. The retrieval algorithm uses a Principal Component-based Radiative transfer model (PCRTM) and performs retrieval in Empirical Orthogonal Function (EOF) domain. The PCRTM fast radiative transfer model provides the principal component (PC) scores of an IASI radiance spectrum and the derivatives of the PC scores with respect to atmospheric parameters. Since the principal components are orthogonal to each other, relatively small number of PC scores are needed to capture the information content of the radiance spectrum. By performing radiative transfer modeling and retrieval in EOF domain directly; the algorithm deals with much smaller dimension as compared to original radiance domain. The retrieval is very efficient and fast.
Published Version
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