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For every 6-hour period the IFS suite will create one gridpoint and one spectral forcing file from ERA-Interim analyses at T255L60 reduced linear Gaussian horizontal grid. It is essential that the forcing files have the same horizontal grid and vertical levels as the OpenIFS experiment.
Model Code Changes
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The source code changes to run OpenIFS 43r3 in nudged configuration are under version control in the OpenIFS Git repository in branch feature/nudging.
In order to control the model's nudgint configuration the following source code files are relevant:
The code in OpenIFS 43r3 nudging branch differs from that in IFS insofar that the variables CLPSHRLX and CLPGGRLX have been added to the namelist. These two variables allow to specify the location of the directory with the forcing files on the file system. If these are not set then the model will expect to find the forcing files in the experiment directory. |
To enable nudging the namelist NAMRLX will need to be included in the namelist file fort.4.
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