Initial & Boundary Data
The COSMO-CLM needs initial and boundary data provided by a model covering a larger area than the simulation area of your chosen COSMO-CLM domain. Possible domain which should be simulated. The data can be taken ege.g. from
- Reanalysis
- GCM
- RCMGlobal Climate Models (GCMs)
- Regional Climate Models (RCMs)
- COSMO-CLM (in case of double nesting)
A number of meteorological variables are needed as initial and boundary data. These
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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
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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 netCDF (standard CF-1.0 formatted) or GRIB format. Minimal resolution in time recommended is 6 hours. Following Denis et al. (2003) a factor of 12 in horizontal resolution between the forcing data and regional simulation is the maximum. Further information on requirements are given in the core documentation part5.
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