Use and impact of the full grid AMSU-B data in the

In the frame of the continuous development of the ALADIN 3D-Var system at the Hungarian Meteorological Service (HMS) our aim is to use as many observations and in as fine resolution as possible. The AMSU-A data are already implemented in the data assimilation system of the limited area model ALADIN Hungary (ALADIN/HU) and used operationally. Our recent work consists of studying the impact of E-AMDAR, atmospheric motion vectors (AMV) and full grid AMSU-B data on the model analysis and short-range forecasts. We use the locally received ATOVS data as well as the ones pre-processed at EUMETSAT and transmitted through the EUMETCast broadcasting system. In this paper we discuss the implementation and the impact of AMSU-B data assimilated in full grid – one-by-one field of view (FOV) – on the ALADIN/HU model. Update of the model and the bias correction programme was necessary to handle all the 90 scan angles instead of the 30 used in the default ARPEGE/ALADIN code. We observed positive impact of the AMSU-B data on the analysis and short-range forecasts of temperature near the surface, and on short-range forecasts of the temperature and humidity in the lower troposphere. Use of the AMSU-B data improves the short-range forecasts of the precipitation.