Overview
Ice sheet coupling with the rest of the model depends on which ice sheet is being modeled, Antarctica or Greenland.
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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_c2_lnd and lnd_c2_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_c2_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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compset
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glc_c2_lnd
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lnd_c2_glc
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ocn_c2_glcshelf
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glcshelf_c2_ocn
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glcshelf_c2_ice
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ocn_c2_glctf
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glc_c2_ocn
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glc_c2_ice
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glcshelf_c2_ice
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MPAS_LISIO_JRA1p
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T
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IGELM_MLI
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T
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T
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BGWCYCL1850
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T
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T
...
T
Attribute strings
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
Sl_tsrf: Surface temperature of glacier (one for each elevation class)
Sl_topo: surface height of glacier (one for each elevation class)
l2x fluxes: Flgl_qice00 through Flgl_qice10
l2x_fluxes_to_glc: Flgl_qice00 to Flgl_qice10
Flgl_qice: New glacier ice flux
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
Sg_ice_covered: Fraction of glacier area
Sg_topo: surface height of glacier
g2x states to lnd: Sg_icemask:Sg_icemask_coupled_fluxes:Sg_ice_covered:Sg_topo
Sg_icemask: Ice sheet grid coverage on global grid
Sg_icemask_coupled_fluxes: Ice sheet mask where we are potentially sending non-zero fluxes
Sg_ice_covered: Fraction of glacier area
Sg_topo
x2l fluxes: Flgg_hflx00 to Flgg_hflx10
x2l fluxes from glc: Flgg_hflx00 to Flgg_hflx10
Flgg_hflx: Downward heat flux from glacier interior.
Resulting 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
Sg_blit: Boundary layer interface temperature for ocean
Sg_blis: Boundary layer interface salinity for ocean
Sg_lithop: Ice sheet lithostatic pressur
Sg_icemask_grounded: Grounded ice mask
Sg_icemask_floating: Floating ice mask
Sg_tbot: Bottom layer ice temperature
Sg_dztbot: Bottom layer ice layer half thickness
g2x_fluxes: Fogg_rofl, Fogg_rofi, Figg_rofi, Flgg_hflx, Fogx_qicelo, Fogx_qiceho
Fogg_rofl glc liquid runoff flux to ocean
Fogg_rofi glc frozen runoff flux to ocean
Figg_rofi: glc frozen runoff_iceberg flux to sea ice
Flgg_hflx: Downward heat flux from glacier interior
Flgg_qicelo: Subshelf liquid flux for ocean
Fogx_qiceho: Subshelf heat flux for the ocean
g2o_liq_fluxes: Fogg_rofl
g2o_iceq_fluxes: Fogg_rofi
x2g_states: Sl_tsrf, So_blt, So_bls, So_htv, So_stv, So_rhoeff
Sl_tsrf:
So_blt: Ice shelf boundary layer ocean temperature
So_bls: Ice shelf boundary layer ocean salinity
So_htv: Ice shelf ocean heat transfer velocity
So_stv: Ice shelf ocean salinity transfer velocity
So_rhoeff: Ocean effective pressure
x2g_states_from_lnd: Sl_tsrf
x2g_fluxes: Flgl_qice, Fogx_qiceli, Fogx_qicehi
Flgl_qice: New glacier ice flux
Fogx_qiceli: Subshelf mass flux for ice sheet
Fogx_qicehi: Subshelf heat flux for ice sheet
x2g_fluxes_from_lnd: Flgl_qice
Modifications to coupler flow.
init
prep_lnd_init (glc_c2_lnd)
if(glc_c2_lnd) init mapper_Sg2l, mapper_Fg2l; derive field lists glc2lnd_non_ec_fields and glc2lnd_ec_extra_fields
prep_ocn_init (glc_c2_ocn, glcshelf_c2_ocn)
if (glc_c2_ocn) init mapper_Rg2o_liq and mapper_Rg2o_ice
if(glcshelf_c2_ocn) init mapper_Sg2o and mapper_Fg2o
prep_ice_init (glc_c2_ice, glcshelf_c2_ice)
if (glc_c2_ice) init mapper_Rg2i
if(glcshelf_c2_ice) init mapper_Sg2i,mapper_Fg2i
prep_glc_init( lnd_c2_glc, ocn_c2_glcshelf)
if ((glc_present .and. lnd_c2_glc) .or. do_hist_l2x1yrg) initialize l2gacc_lx with seq_flds_l2x_fields_to_glc
if (glc_present .and. lnd_c2_glc) initialize l2x_gx with seq_flds_x2g_fields
if (lnd_c2_glc) init mapper_Sl2g, mapper_Fl2g, mapper_Fg2l; form g2x_lx_fields
if (glc_present .and. ocn_c2_glcshelf) init o2x_gx with seq_flds_o2x_fields; init x2gacc_gx
also init mapper_So2g, mapper_Fo2g and arrays for compute_melt_fluxes
if (glc_c2_ocn) do mapping Rg2o_liq, Rg2o_ice; g2x_gx to g2x_ox; seq_flds_g2o_liq/ice_fluxes,
if (glcshelf_c2_ocn) do mapping Sg2o, Fg2o; g2x_gx to g2x_ox MIGHT OVERWRITE ABOVE
if(glc_c2_ice) do mapping Rg2i; g2x_gx to g2x_ix ‘Fixx_rofi’ only
if(glcshelf_c2_ice) do mapping_Sg2i; g2x_gx, g2x_ix, Sg_icemask_coupled_fluxes
if (glc_c2_lnd) do mapping Fg2l, g2x_gx, g2x_lx, glc2lnd_non_ec_fields; do special mapping of elevation class fields with mapper_Fg2l, glc2lnd_ec_extra_fields
in run loop
after land receive
if (glc_present) call cime_run_glc_setup_send
if (lnd_c2_glc OR ocn_c2_glcshelf)
if (glcrun_avg_alarm) accumulate for lnd and ocn
if (lnd_c2_glc) call prep_glc_calc_l2x_gc
from seq_flds_x2g_fluxes_from_lnd, special (bilinear with correction) mapping of Flgl_qice See Bilinear lnd to glc prep_glc_map_qice_conservative_lnd2glc, map_lnd2glc (mapper_Sl2g); also if (smb_renormalize) call prep_glc_renormalize_smb; map_glc2lnd_ec
from seq_flds_x2g_states_from_lnd also call special bilinear mapping one state at a time: prep_glc_map_one_state_field_lnd2glc, map_lnd2glc
else prep_glc_zero_flds
At bottom after running atm and ocn
(if glc_present) run glc (pass in glc_prognostic)
(if glc_present) call cime_run_glc_recv_post
component_exch(glc, flow='c2x')
call cime_run_ocn_recv_post
call cime_run_ocnglc_coupling()
if(glc_present)
if (glcshelf_to_ocn AND ocn_to_glcshelf)
call prep_glc_calc_o2x_gx: call mapper_So2g; o2x_ox to o2x_gx seq_flds_x2g_states_from_ocn
call prep_glc_calculate_subshelf_boundary_fluxes; compute_melt_fluxes
call prep_ocn_shelf_calc_g2x_ox: map_Sg2o, map_Fg2o; g2x_gx, g2x_ox
prep_glc_accum_ocn (accumulate x2g_g fields)
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Overview
Ice sheet coupling with the rest of the model depends on which ice sheet is being modeled, Antarctica or Greenland.
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Ice-shelf coupling: (ocn_c2_glcshelf, glcshelf_c2_ocn)Fluxes between the bottom of the ice shelf and the ocean underneath it. 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. glcshelf coupling is unique in doing a lot of calculations inside the coupler. It’s calculating the melt and heat fluxes on the ocean coupling interval (finer than GLC) and the GLC mesh (finer than OCN).
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_c2_lnd and lnd_c2_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_c2_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
compset (how tested) | glc_c2_lnd | lnd_c2_glc | ocn_c2_glcshelf | glcshelf_c2_ocn | glcshelf_c2_ice | ocn_c2_glctf | glc_c2_ocn | glc_c2_ice |
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MPAS_LISIO_JRA1p (not tested without mod below) | T | |||||||
MPAS_LISIO_JRA1p with mod mpaso/ocn_glcshelf ais8to30, MALI%SIA | T | T | T | T | ||||
IGELM_MLI gis20 MALI | T | T | ||||||
BGWCYCL1850 gis20 MALI | T | T | T |
There is no ocn_c2_glc, ice_c2_glcshelf., ice_c2_glc
Attribute strings
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
Sl_tsrf: Surface temperature of glacier (one for each elevation class)
Sl_topo: surface height of glacier (one for each elevation class)
l2x fluxes: Flgl_qice00 through Flgl_qice10
l2x_fluxes_to_glc: Flgl_qice00 to Flgl_qice10
Flgl_qice: New glacier ice flux
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
Sg_ice_covered: Fraction of glacier area
Sg_topo: surface height of glacier
g2x states to lnd: Sg_icemask:Sg_icemask_coupled_fluxes:Sg_ice_covered:Sg_topo
Sg_icemask: Ice sheet grid coverage on global grid
Sg_icemask_coupled_fluxes: Ice sheet mask where we are potentially sending non-zero fluxes
Sg_ice_covered: Fraction of glacier area
Sg_topo
glc2lnd_non_ec_fields: Sg_icemask, Sg_icemask_coupled_fluxes
x2l fluxes: Flgg_hflx00 to Flgg_hflx10
x2l fluxes from glc: Flgg_hflx00 to Flgg_hflx10
Flgg_hflx: Downward heat flux from glacier interior.
glc2lnd_ec_extra_fields: Flgg_hflx
glc to ocn coupling involves these fields
g2x fluxes: Fogg_rofl, Fogg_rofi (both set to 0), Fogx_qicelo, Fogx_qiceho
g2o_liq_fluxes: Fogg_rofl
g2o_iceq_fluxes: Fogg_rofi
x2o fluxes: Fogx_qicelo, Fogx_qiceho (CALCULATED IN COUPLER)
x2o states: Sg_icemask, Sg_blit, Sg_blis, Sg_lithop, Sg_icemask_grounded, Sg_icemask_floating, Sg_tbot, Sg_dztbot
x2g states: So_blt:So_bls:So_htv:So_stv:So_rhoeff (NONE USED)
x2g fluxes: Fogx_qiceli:Fogx_qicehi
Resulting 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
Sg_blit: Boundary layer interface temperature for ocean (NOT SENT FROM MALI)
Sg_blis: Boundary layer interface salinity for ocean (NOT SENT FROM MALI)
Sg_lithop: Ice sheet lithostatic pressure
Sg_icemask_grounded: Grounded ice mask
Sg_icemask_floating: Floating ice mask
Sg_tbot: Bottom layer ice temperature
Sg_dztbot: Bottom layer ice layer half thickness
g2x_fluxes: Fogg_rofl, Fogg_rofi, Figg_rofi, Flgg_hflx, Fogx_qicelo, Fogx_qiceho
Fogg_rofl glc liquid runoff flux to ocean (Set to 0 in MALI)
Fogg_rofi glc frozen runoff flux to ocean (Set to 0 in MALI)
Figg_rofi: glc frozen runoff_iceberg flux to sea ice (Set to 0 in MALI)
Flgg_hflx: Downward heat flux from glacier interior (NOT SENT FROM MALI)
Flgg_qicelo: Subshelf liquid flux for ocean (NOT SENT FROM MALI)
Fogx_qiceho: Subshelf heat flux for the ocean (NOT SENT FROM MALI)
g2o_liq_fluxes: Fogg_rofl
g2o_iceq_fluxes: Fogg_rofi
x2g_states: Sl_tsrf, So_blt, So_bls, So_htv, So_stv, So_rhoeff (NONE USED IN MALI)
Sl_tsrf:
So_blt: Ice shelf boundary layer ocean temperature
So_bls: Ice shelf boundary layer ocean salinity
So_htv: Ice shelf ocean heat transfer velocity
So_stv: Ice shelf ocean salinity transfer velocity
So_rhoeff: Ocean effective pressure
x2g_states_from_lnd: Sl_tsrf
x2g_fluxes: Flgl_qice, Fogx_qiceli, Fogx_qicehi
Flgl_qice: New glacier ice flux (USED IN MALI)
Fogx_qiceli: Subshelf mass flux for ice sheet (USED IN MALI)
Fogx_qicehi: Subshelf heat flux for ice sheet (NOT USED)
x2g_fluxes_from_lnd: Flgl_qice
Modifications to coupler flow.
Assuming glc_present and glc_prognostic are TRUE so not including.
init
prep_lnd_init (glc_c2_lnd)
if(glc_c2_lnd) init mapper_Sg2l, mapper_Fg2l; derive field lists glc2lnd_non_ec_fields and glc2lnd_ec_extra_fields
prep_ocn_init (glc_c2_ocn, glcshelf_c2_ocn)
if (glc_c2_ocn) init mapper_Rg2o_liq and mapper_Rg2o_ice
if(glcshelf_c2_ocn) init mapper_Sg2o and mapper_Fg2o
prep_ice_init (glc_c2_ice, glcshelf_c2_ice)
if (glc_c2_ice) init mapper_Rg2i
if(glcshelf_c2_ice) init mapper_Sg2i,mapper_Fg2i
prep_glc_init( lnd_c2_glc, ocn_c2_glctf, ocn_c2_glcshelf)
if ( lnd_c2_glc .or. do_hist_l2x1yrg) initialize l2gacc_lx with seq_flds_l2x_fields_to_glc
if ( lnd_c2_glc) initialize l2x_gx with seq_flds_x2g_fields
if (lnd_c2_glc) init mapper_Sl2g, mapper_Fl2g, mapper_Fg2l; form g2x_lx_fields
if (ocn_c2_glctf OR ocn_c2_glcshelf) init o2x_gx with seq_flds_o2x_fields; init x2gacc_gx
also init mapper_So2g, mapper_Fo2g and arrays for compute_melt_fluxes
if (ocn_c2_glctf) init mapper_So2g_tf
if(ocn_c2_glcshelf) init mapper_So2g_shelf
if (glc_c2_ocn) do mapping Rg2o_liq, Rg2o_ice; g2x_gx to g2x_ox; seq_flds_g2o_liq/ice_fluxes,
if (glcshelf_c2_ocn) do mapping Sg2o, Fg2o; g2x_gx to g2x_ox MIGHT OVERWRITE ABOVE
if(glc_c2_ice) do mapping Rg2i; g2x_gx to g2x_ix ‘Fixx_rofi’ only
if(glcshelf_c2_ice) do mapping_Sg2i; g2x_gx, g2x_ix, Sg_icemask_coupled_fluxes
if (glc_c2_lnd) prep_lnd_calc_g2x_lx do mapping with Fg2l, from g2x_gx to g2x_lx, only glc2lnd_non_ec_fields (Sg_icemask, Sg_icemask_coupled_fluxes)
call map_glc2lnd_ec do special mapping from glc to lnd elevation classes using mapper_Fg2l, glc2lnd_ec_extra_fields
in run loop
after land receive
call cime_run_glc_setup_send
if (lnd_c2_glc OR ocn_c2_glctf OR ocn_c2_glcshelf)
if (glcrun_avg_alarm) accumulate for lnd and ocn
if (lnd_c2_glc) call prep_glc_calc_l2x_gx
call prep_glc_map_qice_conservative_lnd2glc: special (bilinear with correction) mapping of Flgl_qice only. See Bilinear lnd to glc.
map_lnd2glc (mapper_Sl2g)
if (smb_renormalize) prep_glc_renormalize_smb; map_glc2lnd_ec
call prep_glc_map_one_state_field_lnd2glc: special bilinear mapping one state at a time: also call map_lnd2glc
if (ocn_c2_glctf) call prep_glc_mrg_ocn
else prep_glc_zero_flds
At bottom after running atm and ocn
run glc (pass in glc_prognostic)
call cime_run_glc_recv_post
component_exch(glc, flow='c2x')
call cime_run_ocn_recv_post
call cime_run_ocnglc_coupling()
if (ocn_c2_glctf OR (glcshelf_to_ocn AND ocn_to_glcshelf))
call prep_glc_calc_o2x_gx:
if (ocn_c2_gtctf) call mapper_So2g_tf; o2x_ox to o2x_gx seq_flds_x2g_tf_states_from_ocn
if (ocn_c2_glcshelf) call mapper_So2g_shelf; o2x_ox to o2x_gx seq_flds_x2g_shelf_states_from_ocn
if (ocn_c2_glcshelf AND glcshelf_c2_ocn)
call prep_glc_calculate_subshelf_boundary_fluxes
call mapper_So2g_shelf; o2x_ox, x2g_gx; seq_flds_x2g_shelf_states_from_ocn
compute_melt_fluxes
call prep_ocn_shelf_calc_g2x_ox: map_Sg2o, map_Fg2o; g2x_gx, g2x_ox
call prep_glc_accum_ocn (accumulate x2g_g fields)
if ( glcshelf_c2_ice) call mapper map_Sg2i; g2x_gx, g2x_ix; Sg_icemask_coupled_fluxes
Special functions in land ice coupling
map_glc2lnd_ec
called by prep_lnd_calc_g2x_lx and prep_glc_renormalize_smb
| Code Block |
|---|
call map_glc2lnd_ec( &
g2x_g = g2x_gx, &
frac_field = glc_frac_field, &
topo_field = glc_topo_field, &
icemask_field = glc_icemask_field, &
extra_fields = glc2lnd_ec_extra_fields, &
mapper = mapper_Fg2l, &
g2x_l = g2x_lx(egi) |
glc_frac_field = ‘Sg_ice_covered’
glc_topo_field = ‘Sg_topo’
glc_icemask_field = 'Sg_icemask'
glc2lnd_ec_extra_fields = Flgg_hflx
This will map Sg_ice_covered, Sg_topo and Flgg_hflx from glc mesh to land model mesh with elevation classes: Sg_ice_covered00, Sg_ice_covered01, etc. Sg_topo00, Sg_topo01, etc., Flgg_hflx00, Flgg_hflx01, etc. There is a loop over elevations classes.
The call from prep_glc_renormalize_smb does not include extra_fields.
prep_glc_accum_avg
called by cime_run_glc_setup_send
| Code Block |
|---|
call prep_glc_accum_avg(timer='CPL:glcprep_avg', &
lnd2glc_averaged_now=lnd2glc_averaged_now) |
accumulation Avs: l2gacc_lx and x2gacc_gx are local save private Avs in prep_glc_mod
if (l2gacc_lx_cnt > 1) call mct_avect_avg(l2gacc_lx(eli), l2gacc_lx_cnt)
if (x2gacc_gx_cnt > 1) then
call mct_avect_avg(x2gacc_gx(egi), x2gacc_gx_cnt)
call mct_avect_copy(x2gacc_gx(egi), x2g_gx)
prep_glc_calc_l2x_gx
called by cime_run_glc_setup_send
call prep_glc_calc_l2x_gx(fractions_lx, timer='CPL:glcprep_lnd2glc')
loop over 1, number of fields in(seq_flds_x2g_fluxes_from_lnd) which is 1, Flgl_qice
call prep_glc_map_qice_conservative_lnd2glc
end loop
loop over 1, number of fields in seq_flds_x2g_states_from_lnd which is 1, Sl_tsrf
call prep_glc_map_one_state_field_lnd2gl
end loop
prep_glc_map_qice_conservate_lnd2glc
called by prep_glc_calc_l2x_gx which is caled by cime_run_glc_setup_send
| Code Block |
|---|
! Use a bilinear (Sl2g) mapper, as for states.
! The Fg2l mapper is needed to map some glc fields to the land grid
! for purposes of conservation.
call prep_glc_map_qice_conservative_lnd2glc(egi=egi, eli=eli, &
fractions_lx = fractions_lx(efi), &
mapper_Sl2g = mapper_Sl2g, &
mapper_Fg2l = mapper_Fg2l) |
using the accumulated l2gacc_lx, map only Flgl_qice (the SMB) using map_lnd2glc to l2x_gx
export Flgl_qice from l2x_gx to an array qice_g
multiply qice_g by area_g/aream_g
if (smb_renormalize) call prep_glc_renormalize_smb using g2x_gx. Also modifies qice_g
import qice_g back in to l2x_gx in the Flgl_qice attribute.
map_lnd2glc
called by both prep_glc_map_qice_conservative_lnd2glc and prep_glc_map_one_state_field_lnd2glc
prep_glc_renormalize_smb
called only by prep_glc_map_qice_conservate_lnd2glc