Adjust Smoothing to Match MPAS smoothing

NCAR / Topo

NCAR Global Model Topography Generation Software for Unstructured Grids

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Adjust Smoothing to Match MPAS smoothing #13

Closed MiCurry closed 2 years ago

MiCurry commented 3 years ago

An issue to discuss updating the software to match the smoothing of MPAS.

adamrher commented 2 years ago

We have looked into this found that halving the smoothing radius from the recommended CAM smoothing radius, does a reasonable job reproducing the MPAS smoothing. Some more details can be found in https://github.com/ESCOMP/CAM/issues/507,

PeterHjortLauritzen commented 2 years ago

Concur with Adam! Half the smoothing radius compared to current default in CAM seems to match MPAS standalone topography well. Below is example from 60-15km MPAS topography: (left) CESM topo software with half default smoothing radius and (right) standalone MPAS topo.

mpas-60-15

Example: For one degree we use ncube_sph_smooth_coarse=60 which would be ncube_sph_smooth_coarse=30 to match MPAS standalone smoothing.