Federal Department of Home Affairs FDHAFederal Office of Meteorology and Climatology MeteoSwiss
Status of the COSMO-1 configuration at MeteoSwiss
Guy de Morsier
COSMO-GM-CORSO, Roma, 6.9.2011
2 COSMO-GM-CORSO, Roma, Sept. 2011 / Status of the COSMO-1 configuration at MeteoSwiss Guy de Morsier
Agenda
• Motivation
• Status of the ARPA-SIM collaboration
• Domain
• Outlook
3 COSMO-GM-CORSO, Roma, Sept. 2011 / Status of the COSMO-1 configuration at MeteoSwiss Guy de Morsier
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
4 COSMO-GM-CORSO, Roma, Sept. 2011 / Status of the COSMO-1 configuration at MeteoSwiss Guy de Morsier
Target: COSMO-1 suite in 2015
8x dailyCOSMO-1 +24 hours forecasts
1 km grid size, 100 layers
1040 x 700 grid pointsIFS boundary conditions 10 km grid size, 140 layers
4x daily
5 COSMO-GM-CORSO, Roma, Sept. 2011 / Status of the COSMO-1 configuration at MeteoSwiss Guy de Morsier
Target: COSMO-E suite in 2015
2x dailyCOSMO-E +5 days forecasts
3 km grid size 21 members
VarEPS boundary conditions 20 km
2x daily
6 COSMO-GM-CORSO, Roma, Sept. 2011 / Status of the COSMO-1 configuration at MeteoSwiss Guy de Morsier
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
9 COSMO-GM-CORSO, Roma, Sept. 2011 / Status of the COSMO-1 configuration at MeteoSwiss Guy de Morsier
Large Alpine Domain698 x 528 gridpoints
CPU of COSMO-2 * 4
y
habs
x
habshgrad *5.0)(
300m filter: max. gr. 18°C-1 with 750m filter: 25°
COSMO-2: 15°
11 COSMO-GM-CORSO, Roma, Sept. 2011 / Status of the COSMO-1 configuration at MeteoSwiss Guy de Morsier
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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