COSMO-CLM

The COSMO model in CLimate Mode (COSMO-CLM or CCLM) is a nonhydrostatic regional climate model developed from the Local Model (LM) of the German Weather Service by the CLM-Community. Since 2005 it is the Community-Model of the german climate research. The model has been used for simulations on time scales up to centuries and spatial resolutions between 1 and 50 km.

The LM has been developed by the German Weather Service (DWD) for operational weather forecast. Meanwhile it is used and further developed by several other weather services organized in the COnsortium for Small-scale MOdelling (COSMO).

The current official model version of the CLM-Community is CLM_3 together with the preprocessor int2clm1. The unified model versions COSMO_4 and int2lm_2 are being tested and evaluated. All future model versions cosmo_x.y_clm_z and int2lm_x.y_clm_z with z=1 will be unified model versions. In this sense the COSMO-CLM model system is a unified model system for Numerical Weather Prediction and Regional Climate Modeling.


The following figure gives on overview of the features of the model system.


Fig. 1: Schematic view of the different COSMO-CLM components

Figure 1. The CLM-Clown shows an example of surface pressure deviation over Europe.