What are the “gx1v3” and “gx3v4” resolutions?
The CCSM2 ocean and ice models share the identical horizontal grid, two of which are presently 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. The latitudinal resolution is variable, with finer resolution near the equator (approximately 0.3 degrees). The latter is the coarser grid, with longitudinal resolution of 3.6 degrees. The latitudinal resolution is variable, with finer resolution near the equator (approximately 0.9 degrees). In the ocean model, there are 40 levels in the vertical 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.
