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For physics-side nudging, available reanalysis data is pre-processed prior to model use. This preparation step interpolates the desired reanalysis data onto a given model grid, adjusts values to account for topographical differences between the reanalysis model and the current topography of CESM, and saves the results in individual files with one time slice per file. The scripts that carry out this processing must be configured for each combination of input reanalysis dataset and output model grid. The scripts are currently available for the FV and SE dycore grids.
The details below are for regridding GEOS and MERRA2 files, particularly on the NCAR HPC. Users wishing to use alternate reanalysis datasets should consult the README.
The processing scripts are slightly different for the two available dycores, so they are contained in separate directories in the IPT repository https://github.com/NCAR/IPT/tree/master/Meterological_Reanalysis_Data. in each directory, there is a README that provides general guidance for setting the script variables for a desired reanalysis product.
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With these changes, the script can be submitted to generate the desired 400 days of data. The user must alway check the Log and output file to verify that the dataset was processed correctly. Selecting some files and browsing variables for valid values using ncdump can save a lot of time and effort if there were problems during the processing.
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A script functioning as of 7/19/2024 on casper is: /glade/u/home/emmons/my_IPT/Meterological_Reanalysis_Data/Finite_volume_dycore/Gen_Data_f09_83L/Gen_MERRA2_fv09_83L_001.csh