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NERSC Directory Change Notice Due to project's name change at NERSC from 'ACME' to 'E3SM' and NERSC’s file system update, the directory ' |
For an overview of the Topography generation process, see the parent page: Adding support for new grids
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- For cubed sphere grids:
- Set resolution via
set ne = 4(for ne4 example here). - Set
smooth_phis_numcycle=16. (adjustable paramemter, lower for less smoothing) - Set smooth_phis_nudt. This is a resolution dependent parameter, recommend value for cubed sphere grids is 28e7 * ( 30/NE)**2
- Set resolution via
- For RRM grids, we use the tensor laplace operator so that the amount of smoothing is proportional to the resolution
- ne=0, mesh_file=/path/to/exodus-rrm-grid-file.g
- Set
smooth_phis_numcycle=12. (adjustable paramemter, lower for less smoothing) - smooth_phis_nudt = 4e-16.
- Set infilenames=/path/to/unsmoothed/PHISdata
After running the tool, the output will be named "geos", in the file phis-smoothed1.nc, along with other unnecessary fields. To convert this file into an EAM topo file:
- ncks -O -v geos,lat,lon phis-smoothed1.nc phis-smoothed2.nc
- ncrename -v geos,PHIS phis-smoothed2.nc
Step (c)
The topography tool then needs to be re-ran to compute the subgrid surface roughness. This is done by passing an extra argument to the topography tool with the smoothed topography output from the standalone HOMME run above:
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