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The information about climatologically constant data from the external data set are one source of information needed to create forcing data for COSMO-CLM. EXTPAR is the main program for preparing the external data set. The interactive web frontend WebPEP (Web interface for Preprocessing External data Parameters) is available for generation the external parameter files with EXTPAR.


Image RemovedPlease be aware, that the size of the domain of the external data has to must be larger then the size of the actual CCLM COSMO-CLM domain. At least two further additional rows of grid points at each of the four sides are required. It is recommended to chose the domain of the external data set rather large, so that it is possible to change the size of the CCLM COSMO-CLM domain, with shifts of start_lon and start_lat, etc. without creating new external data sets.

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