Abstract
This paper presents sensitivity studies with the regional climate model COSMO-CLM for southwest Germany and the period from 1991 to 2000. The influence of horizontal resolution (7 km and 14 km) and driving data (ERA-40 and NCEP reanalysis data) on simulation results are assessed and a suitable simulation setup for high-resolution simulations is derived by using varying domain sizes, soil moisture initialization, physical parameterizations and numerical schemes. The use of ERA-40 reanalyses as driving data yields better overall results for temperature and precipitation than the use of NCEP reanalysis data. Increase in the horizontal resolution leads to better simulation results compared to observations. The choice of driving data has a larger impact on simulation results than changing resolutions, physical parameterizations, numerical schemes or initial soil water contents for simulations of this area.
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