IMPACT OF ATMOSPHERIC MOTION VECTORS (AMVS) ON THE ECMWF SYSTEM AND THE DEVELOPMENT OF A WATER VAPOUR AMV OBSERVATION OPERATOR

A series of Observing System Experiments show that the current 4D-Var operational system benefits from the assimilation of both satellite data and conventional observations. In particular AMVs show a small positive impact in the Northern Hemisphere but are essential component of the observation system for the Tropics. Up till now there has been no attempt to model the vertical structure of the model wind in the observation operator for Water Vapour Clear Sky AMVs. AMVs are considered as single level wind such are aircraft observation. Work to investigate the use of deep layer model winds for an observation operator will be discussed.

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