Winds of change in the use of Atmospheric Motion Vectors in the ECMWF system
Salonen, Kirsti ; Bormann, Niels
The use of Atmospheric Motion Vectors (AMVs) in the ECMWF system is undergoing an extensive revision. The aim is to ensure effective and realistic use of AMVs in data assimilation in order to improve their impact on model analyses and forecasts. The main amendment will be the introduction of situation-dependent observation errors. This is done to ensure that the errors assigned in the data assimilation better account for height assignment errors of the observations. The use of situation-dependent observation errors also enables notable simplifications to the AMV quality control. The modifications give significant positive impact on model analyses and forecasts especially at low levels, and they are planned to be implemented to the ECMWF Integrated Forecasting System (IFS) cycle 39r1 later this year.
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