The CCSM2 ocean and ice models must share a common horizontal grid.
Presently, two different resolutions are officially supported in CCSM: gx1v3 and
gx3v4. In both of these grids, the North Pole has been
displaced into Greenland. The former is the finer of the two, with
longitudinal resolution approximately one degree; its
latitudinal resolution is variable, with finer resolution,
approximately 0.3 degrees, near the equator.
The latter is the coarser grid, with
longitudinal resolution of 3.6 degrees; its latitudinal resolution
is variable, with finer resolution,
approximately 0.9 degrees, near the equator.
In the ocean model, there are 40 vertical levels associated with the
gx1v3 resolution, with level thickness monotonically increasing from
approximately 10 to 250 meters. In the ocean model, it is the combination
of the horizontal grid, horizontal land mask, vertical grid,
and bottom topography that collectively define the "gx1v3" resolution.
There are 25 vertical ocean-model levels associated with the
gx3v4 resolution, with level thickness monotonically increasing from
approximately 12 to 450 meters. The combination
of the horizontal grid, horizontal land mask, vertical grid,
and bottom topography is referred to collectively as the
"gx3v4" resolution in the ocean model.