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The SE dycore runs on cubed-sphere grids (eg, NE30, NE120). The most accurate output is obviously on those native grids. However, plotting and analysis programs often only work with rectangular lat-lon output. And, ACME-CAM may not put all of the necessary information into the output files necessary for general plotting and analysis tools.
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This is setup in the user_nl_cam namelist, using the following namelist variables:
(Note: An example is included in Notes on tuning 1 degree ACME v0 model)
interpolate_analysis = .true.,.true.,.true.,.true.,.true.,.true. ! native grid or interpolation can be different for each history file
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This example will cause CAM to output onto a .5 deg grid.
The options for the output grid type are:
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interp_type = 1 ! 0 = native high order, 1 = bilinear (default)
(Note: This regridding capabalitiy is included in Notes on tuning 1 degree ACME v0 model)