The ALADIN-France Limited-Area Model Joël Stein Marc Tardy Hervé Bénichou.

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Presentation transcript:

The ALADIN-France Limited-Area Model Joël Stein Marc Tardy Hervé Bénichou

model (spectral) orography The domain extends from (57°N,20°W) to (33°N,18°E) mesh-size :  x=  y=9.5 km spectral truncation : E159x159 ALADIN-France

ALADIN-France vertical resolution __ ALADIN __ ECMWF Pressure (hPa) hydrid levels

Operational ALADIN-France configuration New : 3DVAR assimilation, since 25 July 2005 Semi-implicit, semi-lagrangian dynamics Full physical package: -ISBA soil scheme -First order closure turbulence scheme -FMR15 radiation scheme -Bougeault mass-flux convection scheme -Orographic GWD + envelope orography -Adjustment to the saturation

Operational ALADIN-France configuration P54 P48 P42P36 Guess Forecast 3DVAR analyses and forecasts every 6 hours

ALADIN-France 3DVAR data assimilated : same observations as for ARPEGE (radiosoundings, AMDAR, surface data, AMSU-A and B, HIRS radiances, SATOB winds,..) but no QUICKSCAT SEVIRI radiances of Meteosat 8 T2m and Hu 2m (from TEMPs and SYNOPs)

Observations used in ALADIN-France Surface data AMSU-A data

radio-sounding data AMSU-B data Observations used in ALADIN-France

air-borned data SEVIRI data

06/09/2005: red alarm in the south of France Nîmes radar 24 h cumul Surface station 24 h cumul

06/09/2005: red alarm in the south of France ARPEGE forecast ECMWF forecast 24 hours accumulated rain

06/09/2005: red alarm in the south of France ARPEGE forecast ALADIN forecast 24 hours accumulated rain