|Title||An assessment of the accuracy of the RTTOV fast radiative transfer model using IASI data|
|Publication Type||Technical memorandum|
|Year of Publication||2009|
|Secondary Title||ECMWF Technical Memorandum|
IASI measurements of spectral radiances made between the the 1st April 2008 and the 15th April 2008 are compared with simulations performed using the RTTOV fast radiative transfer model utilizing regression coefficients based on different line-by-line models. The comparisons are performed within the framework of the European Centre for Medium-Range Weather Forecasts Integrated Forecasting System using fields of temperature, water vapour and ozone obtained from short-range forecasts. Simulations are performed to assess the accuracy of the RTTOV computations and investigate relative differences between the line-by-line models and the quality of the spectroscopic databases on which the RTTOV coefficients are based.