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The user support is organized by the CLM-Community working group SUPTECH. There are several sources from which community members can get support. 

The RedC contains a lot of technical and all source code information.

In case of problems, please post your questions in the CLM-Community forum. Please include all information necessary to understand the problem (you can also upload files such as the error report, the YUSPECIF file showing your model configuration or plots of the output).

To report bugs one has to fill the “New issue” form for the respective Project (i.e. part of the model system) on the RedC page. Before you fill the from, please make sure, that the issue you encoutered is realy a bug and has not been caused by another problem. Before a bug is reported the issue should be discussed in the forum. Developers are listed on the RedC page -> Projects.

Several other utilities are available which can be used by all community members, such as a the Namelist Tool, the starter package or some postprocessing software. An overview is available here.

In case of questions related to the community membership, please contact the coordination office.

The following table provides additional information for specific keywords/topics:


Please, do not forget to state that you used the “COSMO model in Climate Mode (COSMO-CLM)” and, please, also include the state­ment “COSMO-CLM is the community model of the German regional climate re­search community jointly further developed by the CLM-Community” in each publication.

Please remember, that part of your scientific success relies on the work of those people providing the reference mo­del setup, maintain the codes, etc. Therefore, it would be more than a sign of courtesy to offer them co-authorships once in a while.

Administration tool

Tool for the CLM-Community administration and membership management.

User and password are the same as for RedC.


Special information for new members of the CLM-Community on the structure of the community and on the first steps with the model COSMO-CLM are provided in the section 'For Beginners'

Bug reports

Report bugs in the model code (INT2LM, CCLM) through the RedC web site.

Please report a potential bug first in the forum. In case it turns out to be a real bug, it can be added as such under the "new issue" menu (only managers, developers and reporters have permission create a new issue).

If you want to become a part of a specific project, please contact the manager of that group:

  • COSMO-CLM - Burkhardt Rockel
  • Community Land Model - Edouard Davin
  • INT2LM - Burkhardt Rockel
  • OASIS - Jennifer Brauch
  • EXTPAR - Katherine Osterried 
Climatological background data

To create the external forcing data file, including e.g. land-sea-mask, soiltype, vegetation cover, in rotated coordinates please use the EXTPAR web front-end WebPEP.

Forgotten password

Selfservice for community members to reset passwords.

Forum and Wiki

Forum and Wiki of the CLM-Community can be accessed via RedC. The user name and the initial passwort have been sent to each community member in the Welcome E-Mail. The discussions in the forum are public. To add an own contribution you need to log in.


FAQ pages: ; SPICE (Starter Package for ICON-CLM Experiments)

Support mailing list:[at] 

Initial- and Boundary Data

For some GCMs programs to convert the forcing data to INT2LM-format are already available. At the HPC system at Deutsches Klimarechenzentrum (DKRZ), some already converted datasets are available. An overview can be found here.

Namelist settings

The namelist parameters are described in the User Guide of the COSMO model and also in the Namelist-Tool. The namelist settings for configurations for different regions and/or resolutions are also available in the Namelist-Tool.

Output parameter list

An overview of the possible output variables of COSMO-CLM is availalbe here.


The 'SAnity check for MOdels of the Atmosphere' -Tool is part of the COSMO-CLM Starter Package. The tool checks for some output variables if the values are within a reasonable range. The given margins in the file samoa.list might to be adapted according to the model domain.

Source codes

The source codes of the recommended version of COSMO-CLM and INT2LM can be downloaded from the RedC. The user name and the initial passwort have been sent to each community member in the Welcome E-Mail.

Starter package

Contains everything to run a COSMO-CLM simulation. The starter package is available via RedC.

SPICE (Starter Package for ICON-CLM Experiments) is available via RedC together with further information.

Points of contact for community software and tools:

SoftwarePoint of contact
Climatological test suiteB. Rockel
INT2LMB. Rockel
namelist toolI. Kirchner
remapiconN. N.
SPICE (Starter Package for ICON-CLM Experiments)B. Rockel
Starter package COSMO-CLM

B. Rockel