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title | On this page... |
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Scripts Branch
A local copy of scripts branch damk_CY43R3_getrelax
is required. This branch copies the forcing files from the /fws
working directory to $SCRATCH/rlxml/
. At present the directory rlxml
must exist in the user's scratch space with global writing permissions.
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IFS Experiment
IFS experiment h7z9 is set up to run in nudged configuration and the inigroup task family (shown in the XCdp workflow GUI) will retrieve ERA-Interim re-analyses from the MARS archive and generate the required forcing files. You will need to make a copy of this suite, modify it as described in this section, and submit it to the ECMWF HPCF.
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Note: There is no need to run the model task family. The suite can be aborted after inigroup has completed. |
In prepIFS select the start date and run length in order to produce forcing files. This is done by adjusting variables INIBEGINDATE, INIENDDATE and INITIME such that all show the same start date (usually the first day of the month), e.g. 2013070100.
FCLENGTH should be set to 744 for one month or 1488 for two months of forcing files to be created.
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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
The source code changes to run OpenIFS 43r3 in nudged configuration are under version control in the OpenIFS Git repository in branch feature/nudging. The code in OpenIFS 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.
To enable nudging the namelist NAMRLX will need to be included in the namelist file fort.4.
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title | Default settings in the NAMRLX namelist |
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