Klimasimulation mit einem genesteten Regionalmodell Abschlussbericht

Global atmospheric models are successfully used for climate simulation and may - in combination with ocean models - also be applied to compute scenarios of possible climatic change. Due to their coarse spatial resolutions, however, methods for a regionalization of their results have to be developed. The presented project aimed at contributing to this field. The Europa-Modell (EM) of the Deutscher Wetterdienst, which is in use as an operational weather prediction model, has been applied for January and July simulations in the European area, both for single cases with observed boundary conditions and for series with boundary conditions taken from a multi-annual integration for present climate conducted with the Hamburg global model ECHAM. Additionally, some sensitivity experiments have been conducted with respect to the dependence of simulated regional climate on the size of the model area and on the resolution of the boundary fields. In a prolongation of the project, the modelled energy and water balance of the BALTEX-region (Baltic Sea and entrance region) has been specifically investigated. Results obtained for the regional climate are rather satisfactory and seem to justify future application of the model for pertinent studies, especially for the regionalization of global climatic change scenarios. The sensitivity experiments suggest that for the purpose of climate simulation i) there is no clear advantage obtained by enlarging the model area much beyond the area of interest plus a boundary zone of a few hundred kilometers, necessary for computational reasons, and ii) reasonable results may be obtained by direct nesting of a high-resolution limited area model into a very coarsely resolved global model. (orig.)SIGLEAvailable from TIB Hannover: F95B483 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman