Calculated wind climatology of the South-Saxonian/North-Czech mountain topography including improved resolution of mountains

被引:8
作者
Hinneburg, D
Tetzlaff, G
机构
[1] Institut für Meteorologie, Universität Leipzig, D-04103 Leipzig
来源
ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES | 1996年 / 14卷 / 07期
关键词
D O I
10.1007/s00585-996-0767-2
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A mesoscale model has been applied to calculate climatological means of the surface wind. A reliable average requires more than 40 model runs, which are differentiated by the direction and speed of the geostrophic wind under the assumption of neutral stratification. The frequency distributions of the geostrophic wind have been taken from observations of the 85O-hPa winds at the radiosonde station in Prague for a 10-year period. The simulation results have been averaged over all sectors and speed classes of the geostrophic wind according to their frequencies. A comparison of the calculated mean wind speeds with observed ones shows deviations of about 0.4 ms(-1) outside the mountains. The representation of steep topography and isolated mountains on the basis of a 3-km horizontal resolution of the simulations needs special treatment in order to reduce the gap of up to 4 ms(-1) between observed and simulated mean wind speeds over mountains. Therefore, an empiric speed-up formula has been applied to the isolated mountains that otherwise would fall through the 3-km meshes. The corresponding deviations have been reduced to 1.5 ms(-1).
引用
收藏
页码:767 / 772
页数:6
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