Eidgenössisches Departement des Innern EDI Bundesamt für Meteorologie und Klimatologie MeteoSchweiz News from the COSMO GM 2009 and Future Directions of the COSMO Model Daniel Leuenberger and Marco Arpagaus, MeteoSwiss COSMO User Workshop,

COSMO COnsortium for Small-scale MOdelling Members are the Weather Services of Germany Deutscher Wetterdienst Switzerland MeteoSchweiz Italy Ufficio Generale Spazio Aereo e Meteorologia Greece Hellenic National Meteorological Service Poland Institute of Meteorology and Water Management Romania National Meteorological Administration Russia (since 2009) Roshydromet

COSMO Website Main entry point Model documentation Comparison of Namelist parameter operationally used by all COSMO members (COSMO model (new: CLM!) and INT2LM) Information on priority projects Mailing lists (all working groups and “all”)

COSMO Research and Development Science Plan (Long-term strategy ~2015) Stay at the high end resolution of operational NWP very high resolution (1 km) short to very-short time-scale deterministic as well as probabilistic Ensemble assimilation Environment modelling Priority Projects Concentrated and coordinated effort to reach this goal

Priority Projects Km-Scale Ensemble-Based Data Assimilation (KENDA) Develop ensemble-based data assimilation for the convective scale (1-3 km) Local Ensemble Transform Kalman Filter (Hunt et al., 2007) Prototype version by end of 2009 Conservative dynamical core (CDC) New core for  x = 500 m … 3 km Based on finite volumes Possibly based on EULAG dynamical core Discussion if anelastic kernel is suited for high-res NWP

EULAG Tests Marcin Kurowski, IMGW, Poland

EULAG Tests Marcin Kurowski, IMGW, Poland

Priority Projects (cont‘d) Towards a Unified Turbulence-Shallow Convection Scheme (UTCS) development of a two-equation ( and ) model of PBL turbulence. Goal: Improved representation of mixing within dry and moist PBL Improved representation of entrainment at the PBL top Consolidation of Lower Boundary Conditions (COLOBOC) COSMO-DE EPS (2.8km) Consolidation of COSMO Ensemble (CONSENS) Build a common LEPS for day 1-5 (merge of LEPS + SREPS) Verification System Unified Survey (VERSUS 2)

COLOBOC – Consolidation of Lower BC (I) Facilitate verification tasks: facilitate access to and usage of soil/surface observations Concrete efforts on European basis to share observations Consolidate tools of general interest: externalized TERRA module software for generation of external parameters, consolidate and extend external parameters database NEW: Documentation available on COSMO web site.

COLOBOC – Consolidation of Lower BC (II) Find and validate an optimal configuration of TERRA with its associated external parameters and look-up tables Tests with ‘improved’ TERRA settings showed improved surface characteristics, but worse T2m results, more tests ongoing Revision of snow analysis and snow model First tests show encouraging results Deployment of urban module developed in Switzerland Consolidate parameterization of land surface heterogeneity with the tile/mosaic approach

Configuration of experiment Bare soil evaporation after Noilhan and Platon, 1989 (BS) - former Dickinson, 1984 Non-uniform root distribution (RD) Ground water with upward diffusion HeatCond: Soil moisture dependent heat conductivity No vegetation climatology (int2lm not yet ready) Results show Improved surface fluxes (bowen ratio) But…degraded T2m statistics Problem is further investigated Tests with TERRA

Increased performance of Bowen ratio Standard code Current set of options (RL, RD, BS, SAT) New set of options (GW+RD+BS+SAT+ eINF) Simulations with TERRA standalone Gerd Vogel, DWD

OK Period: September 2, 2007 to May 31, 2008 Station at 2240m in the Western Alps Model at 2097m  h = -143m Tests with two-layer snow model Jean-Marie Bettems, MeteoSwiss

COSMO v4.8 New reference atmosphere (needs int2lm v1.9) Stable integration of Coriolis terms New 2m temperature and 10m wind diagnostics

COSMO v4.9 COSMO-ART More accurate discretization of vertical metric term Potential temperature advection in Runge-Kutta scheme New lateral boundary conditions for qr, qs, qg Bugfix of dynamical bottom boundary condition in Leapfrog core

Intermezzo: Cold pool Problem Localized spots of very cold temperature in COSMO-2 Caused crash two weeks ago Introduction of theta-advection with limiter solves problem

Cause of Cold Pools ADV + HD + MIC + RAD + TUR = TOT Oliver Fuhrer, MeteoSwiss

COSMO v4.10 New sea ice scheme (for testing purposes only) Changes to TKE scheme (implicit TKE diffusion, windshear/SSO production, stability correction for turbulent length scale, others)

Int2lm v1.9 New Reference Atmosphere Modifications in the initialization of perturbed pressure pp Reading additional external parameters (SSO, topographical correction of radiation) Modifications in the vertical interpolation in case of lm2lm Alternative interpolation of soil humidity Alternative treatment of IFS humidity New options for itype_w_so_rel

Thank you for your attention