The namelist variables that control the frequency of the model diagnostics, netCDF history files, and binary restart files are shown in Table 5. By default, diagnostics are written out once every 24 timesteps to the ascii file ice.log.$LID (see section 8.1). $LID is a time stamp that is set in the main script.
histfreq controls the output frequency of the netCDF history files; writing monthly averages is the default. The content of the history files is described in section 8.3. The value of hist_avg determines if instantaneous or averaged variables are written at the frequency set by histfreq. If histfreq is set to '1' for instantaneous output, hist_avg is set to .false. within the source code to avoid conflicts. dumpfreq and dumpfreq_n control the output frequency of the binary restart files; writing one restart file per year is the default.
If print_points is .true., diagnostic data is printed out for two grid points, one near the north pole and one near the Weddell Sea. The points are set at the top of ice_diagnostics.F. This option can be helpful for debugging.
| Varible Name | Type | Default Value | Description |
| restart | Logical | .false. | If true, model is initialized using a restart file, if false, model is initialized using initial conditions in ice_init.F. |
| kcolumn | Integer | 0 | Column model flag. |
| 0 = off | |||
| 1 = column model (not tested or supported) | |||
| kitd | Integer | 1 | Determines ITD conversion |
| 0 = delta scheme | |||
| 1 = linear remapping | |||
| kdyn | Integer | 1 | Determines ice dynamics |
| 0 = No ice dynamics | |||
| 1 = Elastic viscous plastic dynamics | |||
| kstrength | Integer | 1 | Determines pressure formulation |
| 0 = (Hibler(1979)) parameterization | |||
| 1 = (Rothrock(1975)) parameterization | |||
| evp_damping | Logical | .false. | If true, use damping procedure in evp dynamics (not supported). |
| snow_into_ocn | Logical | .true. | If true, snow on ridged ice falls into ocean. |
| advection | Character | 'remap' | Determines horizontal advection scheme. |
| 'remap' = incremental remapping | |||
| 'mpdata2' = second order advection | |||
| 'upwind' = first order advection | |||
| grid_type | Character | 'displaced_pole' | Determines grid type. |
| 'displaced_pole' or 'rectangular' (not supported) | |||
| albicev | Double | 0.73 | Visible ice albedo |
| albicei | Double | 0.33 | Near-infrared ice albedo |
| albsnowv | Double | 0.96 | Visible snow albedo |
| albsnowi | Double | 0.68 | Near-infrared snow albedo |
| no_ice_ic | Logical | .false. | Initializes ice model with no ice |