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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.
This is setup in the user_nl_cam namelist, using the following namelist variables:
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interp_gridtype = 1 ! equal angle lat/lon grid, with point at pole (FV scalar grid)
interp_nlat=256 257 ! for a true equal angle grid, dimensions should be (N+1) x 2N
interp_nlon=512
This example will cause CAM to output onto a .5 deg grid.
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interp_gridtype = 3 equally spaced, no poles (FV staggered velocity) Not Recommended
The interpolate_analysis options are for the different history tapes.
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