METEO-FRANCE ACTIVITIES RELEVANT TO MEGHA-TROPIQUES Jean PAILLEUX et Mathieu NURET METEO-FRANCE (CNRM) 42 avenue G. Coriolis 31057 Toulouse Cedex 1 France.

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Presentation transcript:

METEO-FRANCE ACTIVITIES RELEVANT TO MEGHA-TROPIQUES Jean PAILLEUX et Mathieu NURET METEO-FRANCE (CNRM) 42 avenue G. Coriolis Toulouse Cedex 1 France

OPERATIONAL GLOBAL ASSIMILATION STATUS: global 4D-VARassimilating directly microwave radiances from the current AMSU-A and AMSU-B instruments available on operational polar orbiting satellites (and assimilating also infra-red radiances) ONGOING WORK ON MICROWAVE DATA: only a small number of MW channels is currently used over land; studies performed to use more channels; also to use more instruments (SSM/IS). Improving monitoring and quality control, especially in cloudy areas. PERSPECTIVES FOR MEGHA-TROPIQUES: (i) More frequent MW observations in the tropics: better diurnal cycle in the global data assimilation? (ii)Perspective of real-time monitoring of some Megha- Tropiques data, if available in real-time

EXPERIMENTAL ASSIMILATION OVER AFRICA AMMA: (African Monsoon Meteorological Aspects) will be an opportunity to test experimental data assimilation systems over Africa, at higher resolution compared to operational 4D-VAR, from 2006 onwards. MAIN ASSIMILATION SYSTEM FOR AMMA: A limited area 3D-VAR at 10km resolution over Africa (coupled with the global system). Development efforts made to analyse humidity, clouds and convective areas correctly. PERSPECTIVES FOR MEGHA-TROPIQUES: efforts on the use of microwave data, for improving the water cycle modeling in the tropics, up to a few days range.

MODELLING TROPICAL CYCLONES (LA REUNION – INDIAN OCEAN) Contact: Samuel Westrelin STATUS: Some specific models and assimilation systems are run daily for the specialized tropical centre of La Réunion ONGOING WORK ON TROPICAL CYCLONES: (i) Higher resolution analysis and its impact on cyclone forecasting. (ii)Diagnostics on surface fluxes in cyclonic environment. PERSPECTIVES FOR MEGHA-TROPIQUES: (i) Impact of microwave data on a high resolution analysis and on forecasts? (ii) Can a display of Megha-Tropiques data help cyclone forecasters for evaluating the cyclone intensity? (iii) Observation of surface fluxes.