6.9.1. Ice-shelf calving¶
The options for calving of ice shelves (floating ice) can be selected in the run-specs headers by the parameter
1: Unlimited expansion of ice shelves, no calving.
2: Instantaneous calving of ice shelves if the thickness is less than a threshold thickness, specified by the parameter
3: “Float-kill”: Instantaneous removal of all floating ice.
For the Antarctic ice sheet, yearly ISMIP6-type ice-shelf collapse masks can be prescribed (Seroussi et al. ). This requires the setting
ICE_SHELF_COLLAPSE_MASK = 1 and additional parameters as described in the run-specs headers.
6.9.2. Marine-ice calving¶
For calving of grounded marine ice, the following options are available:
- Parameterization for “underwater-ice” calving (Dunse et al. ).To be selected by the following combination of run-specs-header parameters:
MARGIN = 2,
MARINE_ICE_FORMATION = 2,
MARINE_ICE_CALVING = 9.Further parameters (
R2_CALV_UW) as described in the run-specs headers.
For the Greenland ice sheet, yearly ISMIP6-type retreat masks can be prescribed (Goelzer et al. ). This requires the setting
RETREAT_MASK = 1 and additional parameters as described in the run-specs headers.