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The examples in the CCLM starter package are built in a way that everything will be stored under the directory tree starting with $SPDIR. Running all examples and keeping all files will need about 50 GB disk space.
You can run the CCLM in a step-by-step mode or chain mode. Step-by-step means that for the whole simulation first INT2LM and then CCLM is run. This is appropriate for short term simulation or if one has not to worry about disk space and cpu time for a single job. In chain mode the whole simulation is subdivided into jobs with shorter time chunks. When a short job ends it triggers the start of the next short job and so forth. Using a chain is appropriate for long term simulations.

Step-by-Step Mode


The COSMO-CLM starter package consists of the following scripts for the Step-by-Step mode:
  • Step 1: Interpolation program INT2LM
    The INT2LM program (run_int2lm) interpolates initial and boundary conditions from the driving model to the rotated latitude-longitude grid of the CCLM.
  • Step 2: Regional climate model program CCLM
    The CCLM program (run_cclm) simulates the regional climate based on the primitive thermo-hydrodynamical equations describing compressible flow in a moist atmosphere. The model equations are formulated in rotated geographical coordinates and a generalized terrain-following height coordinate. A variety of physical processes are taken into account by parameterization schemes.

Chain Mode


The COSMO-CLM starter package consists of the following scripts for the chain mode:
  • Main chain script - subchain
    This script calls the following scripts (prep.job.sh, int2lm.job.sh, cclm.job.sh, arch.job.sh, post.job.sh).
  • Pre-processing - prep.job.sh
    This script copies the boundary data from the archive and transforms them into int2lm compatible netCDF format. The script can be adapted to your needs, e.g. copying from tape, via ftp or scp, cutting out a smaller region etc. The boundary data can come from global models (ECHAM, ECMWF, etc.), regional models itself or NCEP, ERAinterim and other models.
  • Interpolation program INT2LM - int2lm.job.sh
    The INT2LM program interpolates initial and boundary conditions from the driving model to the rotated latitude-longitude grid of the CCLM. These are the external parameters for the surface and the global boundary meteorological fields at the model domain’s boundaries.
  • Regional climate model program CCLM - cclm.job.sh
    The CCLM is run by this script.
  • Archiving - arch.job.sh
    This script tars and archives the results of the regional climate model. The forcing data for further nesting are also compressed within this routine. This script can be changed to perform archiving on tape, via ftp or scp.
  • Post-processing - post.job.sh
    This script generates time series of the results of the regional climate model and archives them in the specified directory.
For further information on the chain scripts see the SUBCHAIN Package chapter.
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