Validation of climate-mode MM5-simulations for the European Alpine Region |
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| Authors: | Andreas Pfeiffer Günther Zängl |
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| Institution: | 1. Meteorologisches Institut der Universit?t München, Theresienstra?e 37, 80333, Munich, Germany
2. Deutscher Wetterdienst, Frankfurter Stra?e 135, 63067, Offenbach, Germany
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| Abstract: | Climate mode simulations using MM5 have been conducted over Western Europe on a 45-km grid driven by ECMWF’s ERA40 reanalysis data. We focus our validation on the Alpine region and the Alpine foreland. A reference experiment comprising the years of 1991 to 2000 shows reasonable correspondence to station measurements and a gridded precipitation climatology of the Alps. Also, the mean monthly diurnal cycle of near-surface temperature and dew point temperature verified in the Alpine foreland compares quite well to station data showing some minor discrepancies mainly in the afternoon that seem to be common to regional models. Furthermore, a set of sensitivity experiments was conducted for the years of 1996 to 1999. This set was spanned on the one hand by three convection schemes to get an estimate of the possible range of simulated precipitation amounts inherent to the MM5-system. On the other hand, two different formulations of the horizontal numerical diffusion were investigated with respect to their influence on simulated precipitation in mountainous terrain. It was found that the impact of the formulation of numerical diffusion is similarly large as the sensitivity to the convection scheme, with computing diffusion along the terrain-following coordinate surfaces being clearly worse than computing it in a truly horizontal manner. |
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