The ALADIN-France Limited-Area Model

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The ALADIN-France Limited-Area Model

• Joël Stein
• Marc Tardy
• Hervé Bénichou

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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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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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Observations used in ALADIN-France
radio-sounding data
AMSU-B data
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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
Surface station 24 h cumul
Nîmes radar 24 h cumul
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06/09/2005 red alarm in the south of France
24 hours accumulated rain
ARPEGE forecast
ECMWF forecast
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06/09/2005 red alarm in the south of France
24 hours accumulated rain
ARPEGE forecast
ALADIN forecast