Page Comparison

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Thermal-forcing coupling: (ocn_c2_glctf) Passes thermal forcing at a prescribed ocean depth (300 m) from MPAS-Ocean to MALI, where MALI uses it to calculate grounded marine melting through an existing 'facemelting' parameterization. The thermal-forcing coupling is primarily intended for Greenland where there are primarily vertical cliffs and little floating ice (right side of figure). In that geometry, MPAS-Ocean is not equipped to calculate melt rates, and even if it could, most of the narrow fjords around Greenland would be unresolved so the ocean domain rarely intercepts the Greenland marine termini.  Instead, we make use of marine melting parameterizations that are a function of the thermal forcing (ocean temperature minus in situ freezing temperature).  We also make use of a capability we added to MALI to horizontally extrapolate ocean thermal forcing from wherever on the MALI mesh it’s available to the current terminus positions.  While the thermal-forcing coupling is primarily developed for Greenland, Antarctica also has vertical marine cliffs without ice shelves in some places (and will likely have more in the future), so we do anticipate eventually using the TF coupling in Antarctica at the same time as the ice-shelf coupling. Implemented in https://github.com/E3SM-Project/E3SM/pull/6632

land coupling: (glc_2c2_lnd and lnd_2c2_glc) the surface mass balance (SMB) between the ice sheet and the atmosphere is calculated in the land model. The “glc_2_lnd” coupling passes the necessary data to and from that calculation. The land ice passes elevation of the ice sheet in a flexible number of topography classes (10 in the example below) to the SMB routine in the land model.

sea-ice coupling: (glc_2c2_ice): icebergs. Icebergs form from the ice sheets but are then advected by the sea-ice model.

ocean coupling: (glc_c2_ocn): Sg_icemask, Sg_blit, Sg_blis, Sg_lithop, Sg_icemask_grounded

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