Ice forcing files
Forcing files required for the sea ice model (CICE) are the ocean grid and the ocean bathymetry. A requirement in CESM1 is that the ocean and sea ice model components share the same grid, which is an irregular POP dipole grid; deep time modelers typically use a nominally 1o ocean/ice grid (gx1v6).
Ice initial conditions
Ice initial conditions files are not required for deep time paleoclimate cases. We recommend initializing the ice model with a ‘no ice’ initial state and allowing the model to simulate an ice state. Set ‘no ice’ in the ice model namelist (user_nl_cice).
ice_ic = 'none'