RTTOV-7 - Science and validation report
Saunders [R.W.] ; BRUNEL, P. ; CHEVALLIER, F. ; Deblonde [G.] ; English, S.J. ; MATRICARDI, M. ; RAYER [P.J.]
The direct assimilation of satellite radiances into NWP model analyses is now well established and is showing significant improvements in the skill of NWP forecasts. At the heart of the radiance assimilation process is a fast radiative transfer model which allows radiances, corresponding to those measured by a satellite, to be rapidly simulated using the NWP model short range forecast profiles and surface parameters as input. The fast radiative transfer models used at the Met Office in OPS and VAR is RTTOV and this fast model has been upgraded to TRROV-7 in February 2002. This report describes the scientific changes that have been made to the RTTOV model from the previous version RTTOV-6 and also the results of the various validation tests that were carried out before the code was released to users worldwide by the NWP-SAF. The main upgrades for RTTOV-7 are: much improved simulation of the infrared and microwave water vapour channels, improved microwave surface emissivity model, FASTEM-2, support for AIRS, MODIS, and SSM/I(S), and additional RTTOV routines for simulating cloudy radiances.
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