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Garde

Parameterization and physico-dynamical interface developments for the LAM ALADIN and CSRM AROME Jean-Marcel Piriou, Météo-France. EWGLAM / SRNWP Workshop, Zürich 9-13 October 2006. Garde. Introduction Operational and research models operated: designing unified schemes. PHYSICS.

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Garde

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  1. Parameterization and physico-dynamical interface developments for the LAM ALADIN and CSRM AROME Jean-Marcel Piriou, Météo-France. EWGLAM / SRNWP Workshop, Zürich 9-13 October 2006. Garde

  2. Introduction Operational and research models operated: designing unified schemes PHYSICS Global ARPEGE Aquaplanet mode SCM ARPEGE (EUROCS, GATE, TOGA,BOMEX, ARM, RICO, …) Global regular ARPEGE LAM ALADIN/ 3DVAR / 5-10 km CSRM AROME/ 3DVAR / 2.5 km Global stretched ARPEGE/ 4DVAR-ass./ 23 to 133 km

  3. Introduction Several operational and research models operated Sharing parameterizations between models: • Simpler to manage a single set of source codes. • Feedback from cases studies, scores, users  modifications  improve also the other models. • Sharing a simple and general concept  better understanding: convection, …

  4. Summary On-going efforts in designing unified equation sets: • Subgrid-scale convection: 3MT Fit wider range of grid sizes (GCM - LAM - CSRM). • Grid-scale: Catry et al. 2006 equations: flux-conservative thermodynamic equations. • Phys.-dyn. diagnostics: shared between GCM – LAM - CSRM CSRM AROME developments • Testing the prototype • Subgrid-scale shallow convection

  5. Fin • 3MT: A convective scheme using separate microphysics and transport terms in grid-scale equations

  6. 3MT (Modular Multiscale Microphysics and Transport Convective Scheme) Separating microphysics and transport in grid-scale convective equations Buoyant convective condensation Unbuoyant convective condens. (overs.) Cloudy evaporation Precipitation evaporation SH précip., melt. Transport 3MT: 3MT M & T coupled: (Q1c: réchauffement convectif, Q2c: assèchement convectif fois L) Transport Net condensation

  7. 3MT (Modular Multiscale Microphysics and Transport Convective Scheme) 3MT: Consequences: • Grid-scale equations of the SGS convective scheme are closer to those of CSRM or LES. • Can share microphysical modules between CSRM and parameterization. • Validation of the parameterization versus CSRM or LES can be done for each of the above terms. • No need to assume a stationnarized cloud budget  more consistent with a future prognostic equation of cloud fraction.

  8. 3MT (Modular Multiscale Microphysics and Transport Convective Scheme) What has been done so far 3MT: First prototype with • Deliberately crude microphysics (simple condensation scheme, autoconversion/collection, diagnostic q_r q_s, Kessler-type evaporation) • New proposal for entrainment

  9. 3MT (Modular Multiscale Microphysics and Transport Convective Scheme) Mass flux / vertical velocity in the SGS convectif updraft 3MT: Vertical integral of buoyancy Top LNB P & NH effects Siebesma et al. (2003) Taking into account the overshoots.

  10. 3MT (Modular Multiscale Microphysics and Transport Convective Scheme) Cold pools and entrainment Shallow cumulus phase High entrainment:

  11. 3MT (Modular Multiscale Microphysics and Transport Convective Scheme) Cold pools and entrainment Precipitating cumulus phase Intermediate entrainment:

  12. 3MT (Modular Multiscale Microphysics and Transport Convective Scheme) Cold pools and entrainment Deep convection phase Low entrainment:

  13. 3MT (Modular Multiscale Microphysics and Transport Convective Scheme) Entrainment: an heuristic proposal: prognostic link evap. prec.  entr. Entrainment epsilon depends on local pressure and on zeta, probability of undiluted ascents at the current level Zeta’s source is precipitation evaporation, zeta’s sink is a linear relaxation to zero.

  14. 3MT (Modular Multiscale Microphysics and Transport Convective Scheme) Results on the EUROCS diurnal cycle of deep conv. over land Q2 ARPEGE oper Q2 CSRM MNH Piriou, Redelsperger, Geleyn, Lafore, Guichard, Subm. JAS 2006. ARPEGE V1 Q2 ARPEGE historical entr.

  15. 3MT (Modular Multiscale Microphysics and Transport Convective Scheme) Partly resolved convection: Luc Gerard 3MT: To run in the « grey zone » • A large scale condensation scheme based on Smith (1990). • A prognostic mass-flux scheme extended from Gerard and Geleyn (2005). • 3MT equations, Piriou (2005). • Microphysical routine derived from Lopez (2002). • Prognostic mass-flux parameterization of a moist downdraft driven by evaporative cooling.

  16. 3MT (Modular Multiscale Microphysics and Transport Convective Scheme) Partly resolved convection: Luc Gerard

  17. Fin • Flux-conservative thermodynamic equations

  18. Flux-conservative thermodynamic equations An equation framework, ready for discretization • Total-mass based framework, use of the full barycentric velocity as the vector of advection. • Even in full prognostic treatment of cloud and prec. Processes, flux conservative form of all relevant budgets. • Flux conservative form kept when going from H-Prim. equ. To fully compressible system. Catry, Geleyn, Tudor, Bénard, Trojakova, Tellus (2006)

  19. Flux-conservative thermodynamic equations Catry, Geleyn, Tudor, Bénard, Trojakova, Tellus (2006) Dark grey: unrecommended choices Increasing realism

  20. Fin • AROME developments • 1/ Testing the prototype

  21. Prototype AROME Source Yann Seity, Météo-France/CNRM GMAP 2006.

  22. Domaines AROME configurés sur la FRANCE PARI BRET NORE FRAN MIDPYR SUDE Source Yann Seity, Météo-France/CNRM GMAP 2006. MIDPYR depuis Juin 2005 + SUDE sept-dec 2005, NORE dec2005-avr2006, PARI mai-sept2006 22

  23. Orages (22-05-2006) Source Yann Seity, Météo-France/CNRM GMAP 2006. 13TU

  24. Fin • AROME developments • 2/ Subgrid-scale shallow convection

  25. AROME developments Subgrid-scale shallow convection: S. Malardel, V. Masson, J. Pergaud Subgrid mixing: Eddy diffusivity Mass-flux

  26. AROME developments Subgrid-scale shallow convection: S. Malardel, V. Masson, J. Pergaud EDKF updraft prototype LCL From Kain and Fritsch, 1990 From Lappen and Randall, 2001 (surface fluxes) SURFEX

  27. AROME developments Subgrid-scale shallow convection: S. Malardel, V. Masson, J. Pergaud Rico : high resolution composite case No shallow convection scheme Explicit cloud under a strong inversion

  28. AROME developments Subgrid-scale shallow convection: S. Malardel, V. Masson, J. Pergaud Rico : high resolution composite case EDKF (Pergaud, Malardel, Masson) with subgrid autoconversion Rain specific content (g/kg)

  29. Fin • Conclusions

  30. Conclusions / perspectives • On-going efforts to develop unified approaches: 3MT, grid-scale equations sets, microphysics, DDH physico-dynamical diagnostics. • AROME prototype: developments and validation under progress.

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