Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 2 2009 10.5194/acpd-9-9491-2009 http://www.atmos-chem-phys-discuss.net/9/9491/2009/ http://www.atmos-chem-phys-discuss.net/9/9491/2009/acpd-9-9491-2009.html http://www.atmos-chem-phys-discuss.net/9/9491/2009/acpd-9-9491-2009.pdf 9491 9535 2009-04-14 An assessment of the accuracy of the RTTOV fast radiative transfer model using IASI data M. Matricardi marco.matricardi@ecmwf.int ECMWF, Shinfield Park, Reading, Berkshire, RG2 9AX, UK IASI measurements of spectral radiances made between the 1 April 2008 and the 15 April 2008 are compared with simulations performed using the RTTOV fast radiative transfer model utilizing regression coefficients based on different line-by-line models. 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