Federal Department of Home Affairs FDHA Federal Office

Agenda • Motivation • Status of the ARPA-SIM collaboration • Domain • Outlook COSMO-GM-CORSO,

Motivation for COSMO-1 • Operational target is for 2015 • Why increase the grid

Target: COSMO-1 suite in 2015 IFS boundary conditions 10 km grid size, 140 layers

Target: COSMO-E suite in 2015 COSMO-E Var. EPS boundary conditions 20 km 2 x

Status of the ARPA-SIM collaboration √ Common domain • Test if a common configuration

Large Alpine Domain 698 x 528 gridpoints CPU of COSMO-2 * 4 COSMO-GM-CORSO, Roma,

Outlook • Choice of the orographic filtering should be adapted to the model dynamics!

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Federal Department of Home Affairs FDHA Federal Office of Meteorology and Climatology Meteo. Swiss Status of the COSMO-1 configuration at Meteo. Swiss Guy de Morsier COSMO-GM-CORSO, Roma, 6. 9. 2011

Agenda • Motivation • Status of the ARPA-SIM collaboration • Domain • Outlook COSMO-GM-CORSO, Roma, Sept. 2011 / Status of the COSMO-1 configuration at Meteo. Swiss Guy de Morsier 2

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 systems in the assimilation step • Focus mainly on Alpine region and Alpine specific problems COSMO-GM-CORSO, Roma, Sept. 2011 / Status of the COSMO-1 configuration at Meteo. Swiss Guy de Morsier 3

Target: COSMO-1 suite in 2015 IFS boundary conditions 10 km grid size, 140 layers 4 x daily 8 x daily COSMO-1 + 24 hours forecasts 1 km grid size, 100 layers 1040 x 700 grid points COSMO-GM-CORSO, Roma, Sept. 2011 / Status of the COSMO-1 configuration at Meteo. Swiss Guy de Morsier 4

Target: COSMO-E suite in 2015 COSMO-E Var. EPS boundary conditions 20 km 2 x daily COSMO-GM-CORSO, Roma, Sept. 2011 / Status of the COSMO-1 configuration at Meteo. Swiss 2 x daily +5 days forecasts 3 km grid size 21 members Guy de Morsier 5

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 Langhans 1) • 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 COSMO-GM-CORSO, Roma, Sept. 2011 / Status of the COSMO-1 configuration at Meteo. Swiss Guy de Morsier 6

Large Alpine Domain 698 x 528 gridpoints CPU of COSMO-2 * 4 COSMO-GM-CORSO, Roma, Sept. 2011 / Status of the COSMO-1 configuration at Meteo. Swiss 300 m filter: max. gr. 18° C-1 with 750 m filter: 25° COSMO-2: 15° Guy de Morsier 9

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 COSMO-GM-CORSO, Roma, Sept. 2011 / Status of the COSMO-1 configuration at Meteo. Swiss Guy de Morsier 11