|Title||Investigations into the assimilation of AMSU-A in the presence of cloud and precipitation|
|Series/Collection||EUMETSAT/ECMWF Fellowship Programme Research Report|
|Authors||Weston, P, Geer, AJ, Bormann, N|
|Event Series/Collection||EUMETSAT/ECMWF Fellowship Programme Research Report|
The all-sky assimilation of AMSU-A radiances has been investigated and compared to the clear-sky approach currently used operationally. This work is motivated by the aim to assimilate all microwave instruments through the all-sky system in the future. With this in mind, a detailed investigation of differences in the assimilation configurations between the separate clear-sky and all-sky assimilation systems has been performed. The majority of these differences have been addressed with the all-sky configuration now sharing many common settings with the clear-sky configuration. This is motivated by the fact that the AMSU-A clear-sky configuration has been fine-tuned and optimised over many years so improving upon it with different settings would be difficult.