GEOS-Chem "HP" (aka GCHP) represents the next generation of GEOS-Chem with a distributed memory capability designed to enable efficient scaling across many cores, and thus enable finer resolution simulations. GCHP also has the advantage of using a "cubed-sphere" geometry that will enable more accurate transport and eliminate the polar singularity inherent to lat-lon grids.

The following links illustrate the various features of the cubed-sphere geometry:

  1. Step-by-step guide to creating a cubed-sphere grid

  2. Comparison of several cubed-sphere grid projections

  3. Creating a "stretched" cubed-sphere grid (i.e. where one face has a much finer resolution than the others).

http://www.geos-chem.org/cubed_sphere.html