Assimilation of satellite-derived estimates of tropical convective rainfall
Pullen, S. ; BUTTERWORTH, P.
At present no attempt is made in the global Unified model (UM) to assimilate observations of precipitation. Research has been carried out and initial experiments conducted within the Met Office to assimilate satellite-?derived estimates of tropical convective rainfall into the global UM using a latent heat nudging technique. This report presents results of extended trials of this assimilation into the operational global UM. Although the overall impact on the model performance is not large, a number of interesting features arose during the extensive verification process, notably a reduction of model convective activity in the assimilation region. The results of these trials will be important in understanding the behaviour of the assimilation under the New Dynamics version of the UM when further tests will be necessary.
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