ARPEGE and LMDz physics on EUROCS cumulus case M-P Lefebvre 1, J-L Dufresne 2, J-Y Grandpeix 2, J-F Guéremy 3, F Hourdin 2, P Marquet 3,C Rio 2 1 Météo-France/IPSL,

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ARPEGE and LMDz physics on EUROCS cumulus case M-P Lefebvre 1, J-L Dufresne 2, J-Y Grandpeix 2, J-F Guéremy 3, F Hourdin 2, P Marquet 3,C Rio 2 1 Météo-France/IPSL, Paris, France 2 IPSL/LMD, Paris, France 3 CNRM/GMGEC/EAC, Toulouse, France

Workshop on shallow convection - Toulouse, july Project objectives Structure of the SCM Eurocs-Cumulus case Conclusion & prospect PLAN

Workshop on shallow convection - Toulouse, july Project objectives Development of physical parametrizations is a major issue for GCM community Since october 2003, IPSL and Meteo France decided to collaborate concerning physical parametrizations in their models

Workshop on shallow convection - Toulouse, july Project objectives Share parametrizations Make common analysis of the results It’s not « common physics » nor 2 physics but 2 environments of parametrizations First step: 1D model 3 domains: Waves Radiation Boundary layer/convection/clouds

Workshop on shallow convection - Toulouse, july Project objectives Model: Arpege 1D (cycle 25) Using existing cases To call the entire physics of LMDz in Arpege 1D

Workshop on shallow convection - Toulouse, july Comparison of models’ codes ARPEGELMDz Fortran 90Fortran 77 Growing levels from top to bottomGrowing levels from bottom to top ConstantsSame constants than Arpege except for liquid & solid phase: Cw & Cs Output variables: fluxOutput variables: tendencies Output files: lfaOutput files: netcdf

Workshop on shallow convection - Toulouse, july Call to the physics routines master.F90 Reading Arpege forcings & profiles Initialize LMDz common Temporal loop: Physique Arpege / Physique LMDz ARPEGE physics: APLPARLMDz physics: APLLMD Writing output files

Workshop on shallow convection - Toulouse, july Eurocs-Cumulus case Idealized case of small cumulus over land Observations made at the Southern Great Plains on 21st june 1997 from 11h30UTC, during 15h Surface latent & sensible heat fluxes are prescribed Small tendencies representing the effect of large scale advection and SW radiation are prescribed Vertical resol on : 40 levels Time step : 1 min.

Workshop on shallow convection - Toulouse, july Key characteristics of the SCM ARPEGE climatLMDZ-4 Turbulence TKE/d: Mellor-Yamada- Bougeault (Ricard/Royer) TKE:Laval SBL:Louis except for TH (Mellor & Yamada) Convection Shallow: done by turbulence deep: Bougeault K.Emanuel (KE) M.Tiedtke (TK) Thermiques (TH) Cloud Diagnostic cloud cover & cloud liquid water

Workshop on shallow convection - Toulouse, july Cloud cover ArpegeLMD4_KE LMD4_TKLMD4_TH

Workshop on shallow convection - Toulouse, july LES cloud cover

Potential temperature (K) 1730UTC 2130UTC SCM results from Lenderink and al (QJRMS,2003) INIT---- LES ---- ARPEGE LMD_KE LMD_TK LMD_TH

1730UTC 2130UTC Total water (g/Kg) INIT---- LES ---- ARPEGE LMD_KE LMD_TK LMD_TH SCM results from Lenderink and al (QJRMS,2003)

ARPEGE LMD_KE LMD_TK LMD_TH 1730UTC 2130UTC Cloud cover SCM results from Lenderink and al (QJRMS,2003)

2130UTC 1730UTC Cloud liquid water (g/kg) INIT---- LES ---- ARPEGE LMD_KE LMD_TK LMD_TH SCM results from Lenderink and al (QJRMS,2003)

Resolution dependency : 40 vs 19 levels ___ ARPEGE LMD_KE LMD_TK LMD_TH Total water (g/Kg) at 21h30UTC

Workshop on shallow convection - Toulouse, july Conclusion and prospect Switching of the physics is now « stabilized » and runs on a PC Cases: Toga_Coare, Bomex, Eurocs (2) Future cases: RICO, Fire, IHOP, Ayotte, AMMA … Project SCUM : run different physics like Arpege, Aladin, Arome, Hirlam Intercomparison of radiative code (RTMIP) for next IPCC report Test of new ECMWF LW code (ECMWF) : RTTM is in progress