
Study of storm weather situations in observation and ECHAM3/T42 model simulation
Abstract
In this paper, we provide an estimation of the seasonal distribution of strong wind and stormweather situations in an ECHAM3/T42 climate model simulation in relation to observed conditions.Observational data of the German Bight and the southern Baltic Sea are taken to compareobservations and climate model simulation. The results of the study show significant differencesin the seasonal frequency of occurrence for strong wind and storm weather situations betweensimulation and observations. A new objective classification routine for detecting single strongwind and storm weather situations (Bft 7 and more) in coarse resolution models is used tovalidate the large-scale parameters of those events in the climate simulation. The objectiveclassification routine is able to detect strong wind and storm weather situations of two flowregimes in the German Bight in winter. The routine is applied to the ECMWF Re-Analysis(T42 resolution) and to a climate simulation of the northern Hemisphere, which was performedwith the ECHAM3/T42. It is shown that the large-scale parameters of single strong wind andstorm weather situations are simulated quite realistically in the ECHAM3/T42.
© 1998 Udo Busch, Björn-Rüdiger Beckmann, Rainer Roth, published by Stockholm University Press
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