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A number of meteorological variables are needed as initial and boundary data. These variables are the input for the interpolation programm INT2LM which transfers the data onto the COSMO-CLM grid. However, these data can not be used right away (except the output of a coarser COSMO-CLM simulation), because they are usually provided in different formats and have to be converted to a standard that INT2LM can read (so called "INT2LM ready" data). The preparation of the data for INT2LM is done via so-called converter programs. A list of GCMs for which converter programs already exist is availble here.
Forcing data have to be in netCDF (standard CF-1.0 formatted) or GRIB format.
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Maximal resolution in time recommended for boundary data is 6 hours. Following Denis et al. (2003) a factor of 12 in the horizontal resolution between the forcing data and the resolution of the regional simulation which should be performed is the maximum. Further information on requirements are
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provided in Part V of the
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COSMO documentation
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.
The preparation of the data for INT2LM is done via so-called converter programs. Several already converted ("INT2LM ready") data sets (e.g. NCEP, ERA and COSMO-CLM-data) are available at the DKRZ. For a complete list and how to access the data please visit https://redc.clm-community.eu/projects/cclmdkrz/wiki/INT2LM_input_data_sets. A list of GCMs for which converter programs already exist is availble here.