Forecast sensitivity to satellite observations at Météo-France [poster]
Saint-Ramond, Nathalie ; Doerenbecher, Alexis ; Rabier, Florence ; Guidard, Vincent
The IASI instrument is assimilated at many operational meteorological centres, mainly in clear conditions, providing a significant positive impact on the forecast skill. However, more than 80% on the whole globe is covered by clouds. All the
centres have begun to handle the cloudy data in recent years, starting with the assimilation of cloud-affected radiances with simple assumptions, only considering the absorption effects of the clouds and consequently for very restricted conditions as<br>overcast opaque single layers. The use of fast radiative transfer models, including the scattering and absorption effects of clouds, are a relevant challenge for the next years, in order to increase the amount of cloudy radiances in data assimilation.
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