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If you want to run the model on another domain than Europe, you should follow the following steps to get a reasonable model setup:

  1. Try to get a namelist as starting point:

    1. Check if somebody has already performed a simulation on this domain or a similar domain. If this is the case try to get namelist from the namelist tool or the person directly and use this namelist as starting point.

    2. If there is no simulation for your target domain, or if you can't get a namelist, check if a simulation for a domain in a similar climate zone (mid-latitudes, tropics, maritime, continental, flat, mountainous) has been done and use this namelist as starting point.

  2. Take the recommended COSMO-CLM version and incorporate the domain specific changes from the namelist of step 1.

  3. Perform an ERA-Interim simulation (ideally for 30 years but at least for 10 years) and analyze if the results are reasonable.

  4. Test as many different configurations as possible to find the best possible setup for your domain. For this step, the method proposed by Bellprat et at. can be used (Bellprat. O, S. Kotlarski, D. Lüthi, C. Schär (2012): Objective calibration of regional climate models. Journal of Geophysical Research, 117, D23115, DOI: 10.1029/2012JD018262).

  5. Perform tests with similar setup but different time steps to avoid wrong results as consequence of the time step problem. One time step can give very different results for e.g pressure, precipitation compared to all other timesteps. This time step should not be used climate simulations. For the EURO-CORDEX domain the recommended configuration gives unrealistic results with a time step of 120 seconds. Since the problem is very likely resolution and domain dependent, no general recommendation can be given.)

  6. Choose the best setup for your domain according to your tests.

  7. Send your namelist to Andreas Will (andreas.will[at]b-tu.de) for inclusion in the namelist tool.

  8. Write a short report on your tests and the outcome and send it to the coordinator of the WG EVAL.

Please visit the forum for more details on the procedure and in case of questions!

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