Eidgenssisches Departement des Innern EDI Bundesamt fr Meteorologie
Eidgenössisches Departement des Innern EDI Bundesamt für Meteorologie und Klimatologie Meteo. Schweiz News from the COSMO GM 2009 and Future Directions of the COSMO Model Daniel Leuenberger and Marco Arpagaus, Meteo. Swiss COSMO User Workshop, 22. 10. 2009
COSMO COnsortium for Small-scale MOdelling Members are the Weather Services of Germany Deutscher Wetterdienst Switzerland Meteo. Schweiz 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 www. cosmo-model. org • Model documentation www. cosmo-model. org/content/model/documentation/core/default. htm • Comparison of Namelist parameter operationally used by all COSMO members (COSMO model (new: CLM!) and INT 2 LM) http: //www. cosmo-model. org/content/tasks/operational/ • Information on priority projects http: //www. cosmo-model. org/content/tasks/priority. Projects/ • Mailing lists (all working groups and “all”) http: //mail. cosmo-model. org/mailman/listinfo
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 (<u’ 2+v’ 2+w’ 2> and < ’ 2>) 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. 8 km) • 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 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 T 2 m 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
Tests with TERRA • 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 • Heat. Cond: Soil moisture dependent heat conductivity • No vegetation climatology (int 2 lm not yet ready) • Results show • Improved surface fluxes (bowen ratio) • But…degraded T 2 m statistics • Problem is further investigated
Simulations with TERRA standalone Standard code Current set of options (RL, RD, BS, SAT) New set of options (GW+RD+BS+SAT+ e. INF) Increased performance of Bowen ratio Gerd Vogel, DWD
Tests with two-layer snow model Station at 2240 m in the Western Alps Model at 2097 m h = -143 m OK Period: September 2, 2007 to May 31, 2008 Jean-Marie Bettems, Meteo. Swiss
COSMO v 4. 8 • New reference atmosphere (needs int 2 lm v 1. 9) • Stable integration of Coriolis terms • New 2 m temperature and 10 m wind diagnostics
COSMO v 4. 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, Meteo. Swiss
COSMO v 4. 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)
Int 2 lm v 1. 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 lm 2 lm • Alternative interpolation of soil humidity • Alternative treatment of IFS humidity • New options for itype_w_so_rel
Thank you for your attention
- Slides: 20