Abstract
According to the past experience of retrieving cloud parameters, the assimilation of cloud-affected infrared radiances is a difficult problem in the numerical weather prediction. Based on our own four-dimensional variational assimilation (4D-Var) system's characteristics, we have designed our own cloud-affected infrared satellite radiances variational assimilation system which includes a one- dimensional variational assimilation (1D-Var) retrieval algorithm of cloud parameters. In this system, cloud parameters are considered as the intermediary to constrain the radiative transfer calculation after they are passed to our 4D- Var system. Consequently, acquiring the accurate cloud parameters is the key step of the assimilation of cloud-affected infrared radiances. This article analyzes the 1D-Var algorithm which is used to retrieve cloud parameters in our variational data assimilation system and validates the good performance of this method. Keywords-cloud parameters , 1D-Var, 4D-Var
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