The CLM-Community is an open international network of scientists, who accepted the CLM Community agreement in all of its details. Members of the Climate Limited-area Modelling-Community (CLM Community) are applying and developing the COSMO-CLM or CCLM, which is the COSMO model in CLimate Mode.
The COSMO model is the nonhydrostatic operational weather prediction model applied and further developed by the national weather services joined in the COnsortium for SMall scale MOdeling (COSMO). The first version of the COSMO-CLM (named CLM) was developed by colleagues from HZG, PIK and BTU Cottbus on the basis of the Local Model (LM) version 3.1 (now COSMO model), originally developed by the German Weather Service. In 2005 the CLM became the regional Community-Model for the german climate research. This model version has been applied on time scales up to centuries and spatial resolutions between 10 and 50 km in different regions of the world.
In 2007/08 the CLM and the LM developments have been unified and a model version for regional climate modelling (COSMO-CLM) and operational weather forecast (COSMO), has been made available. The idea of a uniform model version for weather and climate became a guiding principle of the further model development. Each main model version of COSMO is now a unified model version. The subversions may be different.
In 2012 the unified model version COSMO 5 for weather, climate, aerosol and chemistry will be made available. However, due to limited computational resources only a reduced part of ART can be used in climate mode.