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Status of the COSMO-1 configuration at MeteoSwiss Guy de Morsier

Status of the COSMO-1 configuration at MeteoSwiss Guy de Morsier. COSMO-GM-CORSO, Roma, 6.9.2011. Agenda. Motivation Status of the ARPA-SIM collaboration Domain Outlook. Motivation for COSMO-1. Operational target is for 2015 Why increase the grid resolution ?

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Status of the COSMO-1 configuration at MeteoSwiss Guy de Morsier

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  1. Status of the COSMO-1 configuration at MeteoSwiss Guy de Morsier COSMO-GM-CORSO, Roma, 6.9.2011

  2. Agenda • Motivation • Status of the ARPA-SIM collaboration • Domain • Outlook

  3. Motivation for COSMO-1 • Operational target is for 2015 • Why increase the grid resolution? - improve representation of forcing (e.g. topography, land use) - better capture non-linear interaction between different scales (e.g. convection) - improve use of observing systemsin the assimilation step • Focus mainly on Alpine region and Alpine specific problems

  4. Target: COSMO-1 suite in 2015 8x dailyCOSMO-1 +24 hours forecasts 1 km grid size, 100 layers 1040 x 700 grid points IFS boundary conditions 10 km grid size, 140 layers4x daily

  5. Target: COSMO-E suite in 2015 2x dailyCOSMO-E +5 days forecasts 3 km grid size 21 members VarEPSboundary conditions 20 km2x daily

  6. Status of the ARPA-SIM collaboration • Common domain • Test if a common configuration can be used and a common evaluation of results operated • Nesting strategy compare C-1 in C-7 with C-1 in C-2 • Decrease damping in upper layers cf. Wolfgang Langhans1) • Tune the orographic filtering to the stability of the dynamics • Investigate the sensitivity to the asymptotic turbulent length scale and the vertical level distribution • 1)Convergence of numerical simulations of linear hydrostatic gravity wave, March 11, 2011

  7. Large Alpine Domain 698 x 528 gridpoints 300m filter: max. gr. 18° C-1 with 750m filter: 25° COSMO-2: 15° CPU of COSMO-2 * 4

  8. Outlook Choice of the orographic filtering should be adapted to the model dynamics! Try to run unstable cases without horizontal diffusion Set up an assimilation cycle for COSMO-1 Regular runs from the assimilation cycle Evaluate against COSMO-2

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