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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 (External Parameter for Numerical Weather Prediction and Climate Application) 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.
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Numerical Weather Prediction (NWP) models and Climate models require geographical datasets like the orographic height of the earth surface, the plant cover, the distribution of land and sea and, dependent on the schemes used, a variety of other external parameters. The EXTPAR software system (EXTPAR - External Parameter for Numerical Weather Prediction and
Climate Application ) is able to generate external parameters for the models COSMO and ICON. The software can run on the UNIX or Linux system where the raw data is stored. Users (experienced users) can run the scripts to create new external parameters with their own specifications (e.g. the model domain).
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