METEOFRANCE ACTIVITIES RELEVANT TO MEGHATROPIQUES

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METEO-FRANCE ACTIVITIESRELEVANT TO
MEGHA-TROPIQUES

• Jean PAILLEUX et Mathieu NURET
• METEO-FRANCE (CNRM)
• 42 avenue G. Coriolis
• 31057 Toulouse Cedex 1
• France
• Jean.pailleux_at_meteo.fr
• Mathieu.nuret_at_meteo.fr

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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

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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.

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MODELLING TROPICAL CYCLONES(LA REUNION INDIAN
OCEAN)Contact Samuel Westrelin
(samuel.westrelin_at_meteo.fr)

• 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.