Overview
Ice sheet coupling with the rest of the model depends on which ice sheet is being modeled, Antarctica or Greenland.
Ice-shelf coupling: (ocn_c2_glcshelf, glcshelf_c2_ocn) The ice-shelf coupling will be used for Antarctica (left side of figure). Greenland has some small ice shelves, but they are too small to be resolved sufficiently in MPAS-Ocean, so we do not intend to use the ice-shelf coupling for Greenland cases.
Thermal-forcing coupling: (ocn_c2_glctf) 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.
land coupling: (glc_2_lnd and lnd_2_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.
compset | glc_2_lnd | lnd_2_glc | ocn_2_glcshelf | glcshelf_c2_ocn | ocn_c2_glctf | glc_c2_ocn | glc_c2_ice | glcshelf_c2_ice |
|---|---|---|---|---|---|---|---|---|
MPAS_LISIO_JRA1p | T | |||||||
IGELM_MLI | T | T | ||||||
BGWCYCL1850 | T | T | T |
Attribute strings
General land ice states and fluxes
g2x_states: Sg_icemask, Sg_icemask_coupled_fluxes, Sg_ice_covered, Sg_topo, Sg_blit, Sg_blis, Sg_lithop, Sg_icemask_grounded, Sg_icemask_floating, Sg_tbot, Sg_dztbot
g2x_fluxes: Fogg_rofl, Fogg_rofi, Figg_rofi, Flgg_hflx, Fogx_qicelo, Fogx_qiceho
g2o_liq_fluxes: Fogg_rofl
g2o_iceq_fluxes: Fogg_rofi
x2g_states: Sl_tsrf, So_blt, So_bls, So_htv, So_stv, So_rhoeff
x2g_states_from_lnd: Sl_tsrf
x2g_fluxes: Flgl_qice, Fogx_qiceli, Fogx_qicehi
x2g_fluxes_from_lnd: Flgl_qice
land to glc adds the following coupling fields
l2x states: Sl_tsrf00 through Sl_tsrf10 and Sl_topo00 through Sl_topo10
l2x states to glc: Sl_tsrf00 to Sl_tsrf10 AND Sl_topo00 to Sl_topo10
l2x fluxes: Flgl_qice00 through Flgl_qice10
l2x_fluxes_to_glc: Flgl_qice00 to Flgl_qice10
glc to lnd adds the following coupling fields:
x2l states: Sg_ice_covered00 through Sg_ice_covered10 AND Sg_topo00 through Sg_topo10
x2l states from glc: Sg_ice_covered00 through Sg_ice_covered10 AND Sg_topo00 through Sg_topo10
g2x states to lnd: Sg_icemask:Sg_icemask_coupled_fluxes:Sg_ice_covered:Sg_topo
x2l fluxes: Flgg_hflx00 to Flgg_hflx10
x2l fluxes from glc: Flgg_hflx00 to Flgg_hflx10