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$ grib_ls rlxmlgg201308251200 | head rlxmlgg201308251200 edition centre typeOfLevel level dataDate stepRange dataType shortName packingType gridType 1 ecmf hybrid 1 20130825 0 an q grid_simple reduced_gg 1 ecmf hybrid 1 20130825 0 an ciwc grid_simple reduced_gg 1 ecmf hybrid 1 20130825 0 an clwc grid_simple reduced_gg 1 ecmf hybrid 1 20130825 0 an cc grid_simple reduced_gg 1 ecmf hybrid 1 20130825 0 an o3 grid_simple reduced_gg 1 ecmf hybrid 2 20130825 0 an q grid_simple reduced_gg 1 ecmf hybrid 2 20130825 0 an ciwc grid_simple reduced_gg 1 ecmf hybrid 2 20130825 0 an clwc grid_simple reduced_gg $ grib_ls rlxmlsh201308251200 | head rlxmlsh201308251200 edition centre typeOfLevel level dataDate stepRange dataType shortName packingType gridType 1 ecmf hybrid 1 20130825 0 an lnsp spectral_complex sh 1 ecmf hybrid 1 20130825 0 an vo spectral_complex sh 1 ecmf hybrid 1 20130825 0 an d spectral_complex sh 1 ecmf hybrid 1 20130825 0 an t spectral_complex sh 1 ecmf hybrid 2 20130825 0 an vo spectral_complex sh 1 ecmf hybrid 2 20130825 0 an d spectral_complex sh 1 ecmf hybrid 2 20130825 0 an t spectral_complex sh 1 ecmf hybrid 3 20130825 0 an vo spectral_complex sh |
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Relevant Source Code
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In OpenIFS 43r3v1 the source code required for nudging is included by default. . This section points out the relevant files of the source code, however in order to simply enable nudging this part is not essential to understand as the only changes that need to be applied are in the namelist file. The following part How to Enable Nudging describes the required namelist changes.
In order to control the model's nudging configuration the following files of the source code files are relevant:
The nudging code in OpenIFS 43r3v1 differs from that in IFS CY43R3 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. The relaxation to the analyses involves code in further routines (e.g. |
How to Enable Nudging
To enable nudging the namelist NAMRLX will need to be included in the namelist file fort.4. No further modifications should be necessary. The values below show one possible configuration reflecting standard settings. As described previously, the question of which variables should be relaxed to the external analysis, the model grid domain where relaxation is applied, and the tightness of the nudging, controlled by the relaxation coefficient, are very much dependent on the objective of the model experiment.
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