IASI Channel Selection in Cloudy Conditions
Martinet, Pauline ; Lavanant, Lydie ; Fourrié, Nadia ; Rabier, Florence ; Faijan, François
This study attempts to assess the relevance of the selection of the 366 IASI channels used operationally at the European Centre for Medium-Range Weather Forecasts (ECMWF) in the context of cloud-affected profiles. This selection (Collard and McNally 2009) called CM2009 hereafter is evaluated in terms of Degrees of Freedom for Signal (DFS) to evaluate its capability to retrieve information about microphysical variables. Then, a subset of new channels selected on cloud profiles is added to the CM2009 selection. For this new selection, two methods considering different state vectors are evaluated by the DFS of each atmospheric component. After the choice of the best channel selection, its robustness and sensitivity to different parameters are quantified.
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