5. CICE Input Data¶
All runs
The coupled CICE model requires a minimum of two files to run.
Both are set in the &grid_nml section of the namelist (see Table 8: Grid Namelist Options)
for more information
grid_fileis a binary or netcdf file containing grid information such as the latitude, longitude, grid cell area, etc.kmt_fileis a binary or netcdf file containing land mask information. This points to the ocean model KMT file or the depths of the ocean columns.
Depending on the grid selected in the scripts, the appropriate
grid_file and kmt_file files will be used in the executable
directory. These files are read directly from the system input data
directory and not copied to the executable directory. Currently, only
the POP resolutions of gx3, gx1, tx1, and tx0.1 grids are supported for the ice and
ocean models. Note that these files can now be used in netCDF format.
Initial and Hybrid runs
For initial or hybrid runs, a third variable is required and is set in
the &setup_nml section of the namelist (see Table 1: Setup Namelist Options).
ice_ic = 'none'initializes the sea ice to zero everywhereice_ic = 'default'initializes the sea ice to 100% concentration where the SST is below the freezing point to a thickness of 2 m in the Northern Hemisphere or 1 m in the Southern Hemisphere.ice_ic = 'filename.nc'will read the state information from an initial file named “filename.nc”. The resolution of this file must match that ingrid_file, as set above.
Restart and Branch runs
Restart or branch runs are discussed later.
The input datasets are generally handled by the CESM driver.