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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.

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In order to control the model's nudgint configuration the following source code files are relevant:

  • namrlx.nam.h  –  the namelist block which appears in the fort.4 file.
  • yomrlx.F90  – definition of variables in the namelist
  • surlx.F90  – setup routine for the namelist, including initialisation of the variables
  • updrlxref.F90  – updates the reference fields for relaxation

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.

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