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Arome SCM mini-intercomparison

Arome SCM mini-intercomparison. Sylvie Malardel Julien Pergaud, Valery Masson, (Arome/Méso-NH, CNRM, Météo-France) Pedro Soares. Arome, SCUM … Shallow convection schemes Rico composite, L80 with KFB, EDMF, EDKF Rico composite, L41. LCL. Arome.

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Arome SCM mini-intercomparison

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  1. Arome SCMmini-intercomparison Sylvie Malardel Julien Pergaud, Valery Masson, (Arome/Méso-NH, CNRM, Météo-France) Pedro Soares

  2. Arome, SCUM … • Shallow convection schemes • Rico composite, L80 with KFB, EDMF, EDKF • Rico composite, L41 LCL

  3. Arome • Arome : the NH-dynamics from IFS/ARPEGE/Aladin and a mesoscale physics from Méso-NH • ECMWF radiation scheme • SURFEX (externalized surafec scheme from Méso-NH) • CBR turbulent scheme from Méso-NH (TKE) • explicit microphysics (1 moment, 2 liquid and 3 ice species) • + a shallow convection parametrisation • KFB directly from Méso-NH • EDMF and EDxx

  4. SCUM : Single Column Unified Model An option to run ARPEGE/ALADIN/AROME in a (pseudo)-1D configuration: everything as in the 3D model + large scale forcing on Linux PC A 1D testbed for intercomparison of (IFS)/ARPEGE/ALADIN/AROME/(HIRLAM)/(ALARO) physics

  5. Which shallow convection scheme for Arome ? • Do we need one ? • KFB : « copy » of the deep convection scheme developed in Méso-NH (Bechtold et al, 1993) + statistical cloud scheme (Chaboureau and Bechtold, 2002) • Mass flux with LCL triggering and CAPE closure • EDMF : Mass flux scheme developed by P. Soares (SOARES et al, 2004) in Méso-NH with « light » technical modifications • EDKF : « modified » EDMF (Pergaud, Malardel, Masson, this summer) with • Dry updraft from Lappen and Randall, 2001 • Cloudy updraft from Kain and Fritsch, 1990

  6. LCL From Kain and Fritsch, 1990 From Lappen and Randall, 2001 (surface fluxes) SURFEX EDKF updraft prototype

  7. Rico : high resolution composite case No shallow convection scheme Explicit cloud under a strong inversion

  8. Rico : high resolution composite case KFB shallow convection scheme (Bechtold et al, 1993) with statistical cloud scheme (Chaboureau and Bechtold, 2002) Results are identical if shallow+deep

  9. Rico : high resolution composite case EDMF (Soares et al, 2004) with statistical cloud scheme +36 h

  10. Rico : high resolution composite case EDKF (Pergaud, Malardel, Masson) +36 h

  11. Rico : high resolution composite case EDKF (Pergaud, Malardel, Masson) with subgrid autoconversion Rain specific content (g/kg)

  12. Rico : high resolution composite case EDKF without and with subgrid autoconversion no AUCV no AUCV AUCV AUCV AUCV no AUCV no AUCV AUCV no AUCV AUCV

  13. Rico : composite case with Arome resolution (L41) L41 L80 L80 L41 L80 L41

  14. Rico : Arome resolution (L41) composite case t=24h t=24h L80 L41 L80 L41 L80 L41 L80 L41 23-24h average 23-24h average

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