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Another alternative is to tell ACME-CAM to regrid the output onto a rectangular lat-lon grid before writing it out to the output file. This uses bilinear interpolation, which isn't ideal for every purpose, but is good enough for many purposes. To be safe with this type of interpolation, always interpolate to a grid with finer resolution than the native grid. 25% finer is a good rule of thumb.
This is setup in the user_nl_cam namelist, using the following namelist variables:
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