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Comparison of precipitation in the regional climate model BALTIMOS to radar observations |
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| Authors: | Andi Walther Marc Schröder Jürgen Fischer Ralf Bennartz |
| Institution: | 1. Institut für Weltraumwissenschaften, Freie Universit?t Berlin, Berlin, Germany 2. Cooperative Institute for Meteorological Satellite Studies, University of Wisconsin–Madison, 1225 W. Dayton St., Madison, WI, 53706, USA 3. Department of Oceanic and Atmospheric Sciences, University of Wisconsin–Madison, Madison, WI, USA |
| Abstract: | Observational data and simulations of the regional climate system Baltic integrated model system (BALTIMOS) were used to study precipitation in the Baltic Sea and its drainage basin with a special focus on the diurnal cycle. The study includes a general evaluation of BALTIMOS precipitation, showing that BALTIMOS has too many light rain events causing an overestimation of the total annual precipitation amount. The diurnal cycle as well as its spatial distribution was analysed. BALTIMOS captures the broad characteristics: a significant diurnal variability with an afternoon peak above land and weak variability with a nocturnal peak above sea. An algorithm to distinguish between frontal and convective precipitation was applied to examine the diurnal cycle more thoroughly. The local solar time of maximum rain in summer is about 1 to 2 h earlier in BALTIMOS than in radar observations of precipitation. |
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