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The data assimilation system implementation and output for validation

The data assimilation system implementation and output for validation. Gianpaolo BALSAMO, François BOUYSSEL, Jöel NOILHAN. ELDAS Data Coordination meetin g – Météo-France Toulouse 17-18 September 2003. Plan of the presentation. ELDAS at Météo-France The implementation of the system

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The data assimilation system implementation and output for validation

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  1. The data assimilation system implementation and output for validation Gianpaolo BALSAMO, François BOUYSSEL, Jöel NOILHAN ELDAS Data Coordination meeting– Météo-FranceToulouse17-18 September 2003

  2. Plan of the presentation • ELDAS at Météo-France • The implementation of the system • Model (ARPEGE) • Climatology (ECOCLIMAP) • The coupling to atmosphere (Restore/Blending) • Data Assimilation technique (Simplified 2D-VAR) • DATA flow • The assimilated data • The output for validation • PRELIMINARY EXPERIMENTS • 1-6 June 2000 • May 2003

  3. ARPEGE:Global spectral stretched model 20 to 200 km, 41 levels (1 hPa) , 4 runs/day (96h) 4D-Var (T107, T161) : 6h assimilation cycle The NWP model Cycle 26 (Current) Operational version: (stretching 3.5 )

  4. Spatial Coverage

  5. The implementation of ECOCLIMAP • Global 1km database (V. Masson et al., 2003) • Issued combining existing land-cover maps, climate maps, in addition to using the AVHRR satellite data LAI for January and June from ECOCLIMAP See:http://www.cnrm.meteo.fr/gmme/PROJETS/ECOCLIMAP/page_ecoclimap.htm A 10km aggregation is used for ARPEGE input climatology

  6. +6hfcst +6hfcst +6hfcst +6hfcst The land surface analysis OI New T2m, Rh2m, Ts, Tp, Ws 2D-Var New Wp The atmospheric coupling • The atmospheric state is not re-analysed • 2 solutions:Restore or Blending

  7. Archive AtmosphericAnalyse Atmosphericguess Atmosphericguess +6hfcst New Land Surface Analysis The atmospheric coupling Restore Blending Archive AtmosphericAnalyse « + » New Land SurfaceAnalysis New Land SurfaceAnalysis

  8. Plan of the presentation • ELDAS at Météo-France • The implementation of the system • Model (ARPEGE) • Climatology (ECOCLIMAP) • The coupling to atmosphere (Restore/Blending) • Data Assimilation technique (Simplified 2D-VAR) • DATA flow • The assimilated data • The output for validation • PRELIMINARY EXPERIMENTS • 1-6 June 2000 • May 2003

  9. The assimilated data • T2m RH2m (analysed by the Optimum Interpolation on ARPEGE grid) • Observations are available every 6 hours. • No other observations are assimilated (at present).

  10. Field site temporal data • Extracted from Arpege 6h forecast cycle (1 hour rate) • Nearest model grid point • No post-processing (at present) to compensate field site / model differences. Spatial data • Extracted from Arpege grid: • LAT, LON, VALUE • No extrapolation to ELDAS regular lat lon grid (at present) • No grib produced (at present)

  11. Field site climatology: Loobos Site

  12. Plan of the presentation • ELDAS at Météo-France • The implementation of the system • Model (ARPEGE) • Climatology (ECOCLIMAP) • The coupling to atmosphere (Restore/Blending) • Data Assimilation technique (Simplified 2D-VAR) • DATA flow • The assimilated data • The output for validation • PRELIMINARY EXPERIMENTS • 1-6 June 2000 • May 2003

  13. PRELIMINARY EXPERIMENTS • 1-6 June 2000 and zoom over ELDAS domain • May 2003: Ecoclimap and Operational cycles

  14. Schedule of activities Implementation part • The implementation of the system [done] • Validation of Atm. Coupling method [in progress] • Optimization of cycle settings [in progress] Output data production • Trial dataset 1-6 June 2000 [done] • May-June 2000 [to be done: ready to start] • May-October 2000 [by end of 2003]

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