the aladin-france limited-area model joël stein marc tardy hervé bénichou
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The ALADIN-France Limited-Area Model
Joël Stein
Marc Tardy
Hervé Bénichou
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model (spectral) orography
The domain extends from (57°N,20°W) to (33°N,18°E)
mesh-size : Dx=Dy=9.5 km
spectral truncation : E159x159
ALADIN-France
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ALADIN-Francevertical resolution
__ ALADIN__ ECMWF
0.1
1
10
100
1000
Pressure (hPa)
1 11 21 31 41 51 61
41 hydrid levels
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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
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Operational ALADIN-France configuration
P54 P48 P42 P36
Guess Forecast
3DVAR analyses and forecasts every 6 hours
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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)
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Observations used in ALADIN-France
Surface data AMSU-A data
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radio-sounding data AMSU-B data
Observations used in ALADIN-France
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Observations used in ALADIN-France
air-borned data SEVIRI data
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06/09/2005: red alarm in the south of France
Nîmes radar 24 h cumul Surface station 24 h cumul
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06/09/2005: red alarm in the south of France
ARPEGE forecast ECMWF forecast
24 hours accumulated rain
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06/09/2005: red alarm in the south of France
ARPEGE forecast ALADIN forecast
24 hours accumulated rain