E3SM atmospheric initial condition remap tool (model-to-model) #8007
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The remap_atmIC_m2m tool remaps the atmospheric initial condition from one model resolution to another. This tool is based on Wuyin's IDL code.
rljacob
reviewed
Jan 22, 2026
| You need: | ||
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| - Source initial condition file: `${CASENAME}.eam.i.${TIMESTAMP}.nc` | ||
| - ESMF remapping weights: `map_source_to_target.nc` |
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Why ESMF in particular? We've tried to move all remapping to TempestRemap.
rljacob
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Jan 22, 2026
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| Output: `${CASENAME}_mapped_${TARGET_GRID}-topoadj.eam.i.${TIMESTAMP}.nc` | ||
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| ## Files |
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Move this to the top. Explain what "m2m" means.
rljacob
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Jan 22, 2026
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| ## Requirements | ||
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| - E3SM unified environment |
rljacob
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input file
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Is this for EAM only or does it also work for EAMxx? |
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The remap_atmIC_m2m tool remaps the atmospheric initial condition (IC) from one model resolution to another with proper surface pressure adjustment for topography differences. This tool is based on Wuyin's IDL code. It is an important step to ensure numerical stability when initializing the atmosphere with the IC from a different resolution, e.g., running a new RRM with the LR atmosphere IC.
An example can be found at https://portal.nersc.gov/cfs/e3sm/tang30/remap_atmIC_m2m.
A successful E3SM test simulation is located on Chrysalis:
/lcrc/group/e3sm2/ac.qtang/E3SMv3/RRM_ensemble/v3.NARRM.amip_v3.LR.historical_0321/tests/custom-8-_1x8_ndays/run