High-resolution sensitivity studies with the regional by Cathérine Meißner

By Cathérine Meißner

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1 INFLUENCE OF SIMULATION AREA In the southern part, the area of investigation ends at the alpine foothills and it would be convenient to have the boundary of the simulation area in this region. It is well known that placing the model boundary in mountainous regions can be inconsistent with the boundary condition formulations and causes difficulties in the simulation of the vertical wind field because of the non-hydrostatic formulation of the model. Alternatively, the whole alpine region has to be simulated with corresponding CPU costs.

With regard to the area average of total precipitation one would have expected a lower bias in the 14 km runs because the area average is about 6-65 mm lower than the average for the 7 km runs which is closer to observations (Tab. 2). g. FRHBF, LAHR and BADENW) for the 14 km runs (Fig. 15) and in total to a much higher rmse than in the 7 km runs. g. FELDBE, FST and TRBG). 2: Area average of annual total, convective and grid scale precipitation sum for the investigation area averaged over the period 1991 – 2000.

The simulation setup and the simulation domains are presented in the first section and in the second section, the impact of driving data, grid size (50 km, 14 km and 7 km), and soil initialisation on the simulation results is discussed for the whole simulation area. The evaluation of the model setup, concentrating on the area of Southwest Germany, is undertaken in the third section. A sensitivity study for the four parameters mentioned above is also presented. The most suitable model setup is then used to investigate the ability of COSMO-CLM to reproduce observed trends of the near-surface temperature between 1991 and 2000 for Southwest Germany.

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