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Balanced Coupling Between Vertical Motion and Diabatic Forcing for Variational Data Assimilation

Balanced Coupling Between Vertical Motion and Diabatic Forcing for Variational Data Assimilation. Luc Fillion Collaborators: Monique Tanguay, Nils Ek, Christian Page, Simon Pellerin, Michel Desgagne Meteorological Service Canada Dorval, Québec, Canada.

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Balanced Coupling Between Vertical Motion and Diabatic Forcing for Variational Data Assimilation

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  1. Balanced Coupling Between Vertical Motion and Diabatic Forcing for Variational Data Assimilation Luc Fillion Collaborators: Monique Tanguay, Nils Ek, Christian Page, Simon Pellerin, Michel Desgagne Meteorological Service Canada Dorval, Québec, Canada

  2. Development of a Limited Area VDAS(Main Focus: Precipitation) Unified Global/LA Variational analysis code. Main features (at the present time: 1st Sept 2005): 1. Extension of Meso3D-Var to 4D-Var (june 2005). 2. Coupling of Divergence and Mass fields using Moist Diabatic Balance Operators directly in the Variational Analysis.

  3. 500 hPa wind analysis increments: FGAT Versus 4D-Var 1 UU-Obs at 500 hPa at 0h

  4. Meso 4DVar wind analysis increments at 500 hPa Time Assimilation window: 6h

  5. Adiabatic Balance (Mike Fisher’s approach at ECMWF) ------------------------

  6. Diabatic Balance (Kasahara & Krishnamurti’s dream!) ------------------------

  7. Diabatic Balance Included 24 August 2004; 12 UTC

  8. ~ 500 hPa Wind Increments

  9. Total w (μbs-1) at 500 hPa

  10. w mbs-1

  11. Kain-Fritsch Temperature Tendency 500hPa 850 hPa

  12. RHS Convective Forcing of w Equation Mesovar_L: 50 km; 58 Levels

  13. 500 hPa Wind Increments due to Convective Forcing

  14. 850 hPa Wind Increments due to Convective Forcing

  15. Summary: Benefits of the coupling 1. Better I.C. for NWP over diabatic regions. 2. Spin-up effects should be reduced 3. Can improve Precipitation Assimilation 4. Can potentially be extended down to Kilometric XD-Var Data Assimilation; i.e. See Christian Page ‘s talk at 12h45 !

  16. Regional model

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