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GardeGarde Parameterization and physico-dynamical interface developments for the LAM ALADIN and CSRM AROME Jean-Marcel Piriou, Météo-France. EWGLAM / SRNWP.

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Presentation on theme: "GardeGarde Parameterization and physico-dynamical interface developments for the LAM ALADIN and CSRM AROME Jean-Marcel Piriou, Météo-France. EWGLAM / SRNWP."— Presentation transcript:

1 GardeGarde 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 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.

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

3 Sharing parameterizations between models: 1. Simpler to manage a single set of source codes. 2. Feedback from cases studies, scores, users modifications improve also the other models. 3. Sharing a simple and general concept better understanding: convection, … Introduction Several operational and research models operated Introduction

4 SummarySummary On-going efforts in designing unified equation sets: 1. Subgrid-scale convection: 3MT Fit wider range of grid sizes (GCM - LAM - CSRM). 2. Grid-scale: Catry et al equations: flux- conservative thermodynamic equations. 3. Phys.-dyn. diagnostics: shared between GCM – LAM - CSRM CSRM AROME developments 1. Testing the prototype 2. Subgrid-scale shallow convection

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

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. Grid-scale equations of the SGS convective scheme are closer to those of CSRM or LES. Can share microphysical modules between CSRM and parameterization. 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. 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. 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 (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) Deliberately crude microphysics (simple condensation scheme, autoconversion/collection, diagnostic q_r q_s, Kessler-type evaporation) New proposal for entrainment New proposal for entrainment

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

10 3MT (Modular Multiscale Microphysics and Transport Convective Scheme) Cold pools and entrainment 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 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 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. 3MT (Modular Multiscale Microphysics and Transport Convective Scheme) Entrainment: an heuristic proposal: prognostic link evap. prec. entr. Zetas source is precipitation evaporation, zetas sink is a linear relaxation to zero. Entrainment epsilon depends on local pressure and on zeta, probability of undiluted ascents at the current level Entrainment epsilon depends on local pressure and on zeta, probability of undiluted ascents at the current level

14 3MT (Modular Multiscale Microphysics and Transport Convective Scheme) Results on the EUROCS diurnal cycle of deep conv. over land 3MT (Modular Multiscale Microphysics and Transport Convective Scheme) Results on the EUROCS diurnal cycle of deep conv. over land Q2ARPEGEoper ARPEGEV1 Q2 CSRM MNH Q2ARPEGEhistoricalentr. Piriou, Redelsperger, Geleyn, Lafore, Guichard, Subm. JAS 2006.

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

17 FinFin Flux-conservative thermodynamic equations

18 An equation framework, ready for discretization Total-mass based framework, use of the full barycentric velocity as the vector of advection. 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. 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. 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) Increasing realism Dark grey: unrecommended choices

20 FinFin AROME developments 1/ Testing the prototype

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

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

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

24 FinFin AROME developments 2/ Subgrid-scale shallow convection

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

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

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

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

29 FinFin Conclusions Conclusions

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


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