Produced by: Université Libre de Bruxelles
CO distributions are retrieved from IASI radiance spectra using the Fast Optimal Retrievals on Layers for IASI (FORLI) software, developed and maintained at the ‘‘Université Libre de Bruxelles’’ (ULB) with the support of the ‘‘Laboratoire Atmosphères, Milieux, Observations Spatiales’’ (LATMOS). It handles as fast as possible all the IASI spectra, i.e. 1.3 millions of observations per day, disseminated through the Eumetsat data distribution system, Eumetcast, about 2.5 hours after observation. FORLI radiative transfer uses pre-calculated tables of absorbances at various pressurse and temperatures, in the spectral region of the CO 1-0 band. The temperature and humidity profiles used as inputs come from the operational MetOp Level 2 meteorological products. The retrieval scheme is based on the Optimal Estimation Method (OEM) described by Rodgers (2000) and uses a priori mean profile and his associated variance-covariance. A CO profile is retrieved, as well as diagnostic tools including retrieval errors from various sources (smoothing, measurements) and averaging kernels.