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Add grid to CESM Add grid to CESM

Set up CESM3 with new grid

On Updated June 2025: On derecho, checkout a CESM3 beta tag (that uses ctsm5.2).  It is recommended the source code is cloned into your work (or scratch, if necessary; you might run out of space in home) directory where sufficient storage is available. CESM3 has replaced manage_externals with git-fleximod, which requires the following commands:

> git clone https://github.com/ESCOMP/CESM.git cesm3_0_beta01beta06
> cd cesm3_0_beta01beta06
> git checkout cesm3_0_beta01beta06
> ./bin/git-fleximod update

Below, $CESMCODE refers to yourcesm3_0_beta01 directorybeta06 directory.

CCS_CONFIG

1. Add an entry for your new ESMF mesh file in <cesm>/ccs_config/component_grids_nuopc.xml

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