Merge pull request mom-ocean#85 from gustavo-marques/misomip_pass_mel…

…t_rate

Pass melt_rate via surface type

config_src/mct_driver/MOM_ocean_model.F90

@@ -257,7 +257,8 @@ subroutine ocean_model_init(Ocean_sfc, OS, Time_init, Time_in, gas_fields_ocn, i
                          !! The actual depth over which melt potential is computed will
                          !! min(HFrz, OBLD), where OBLD is the boundary layer depth.
                          !! If HFrz <= 0 (default), melt potential will not be computed.
-  logical :: use_melt_pot!< If true, allocate melt_potential array
+  logical :: use_melt_pot  !< If true, allocate melt_potential array
+
 
 #include "version_variable.h"
   character(len=40)  :: mdl = "ocean_model_init"  !< This module's name.
@@ -358,14 +359,16 @@ subroutine ocean_model_init(Ocean_sfc, OS, Time_init, Time_in, gas_fields_ocn, i
                  "where OBLD is the boundary layer depth. If HFREEZE <= 0 (default), \n"//&
                  "melt potential will not be computed.", units="m", default=-1.0, do_not_log=.true.)
 
+
   if (HFrz .gt. 0.0) then
     use_melt_pot=.true.
   else
     use_melt_pot=.false.
   endif
 
   call allocate_surface_state(OS%sfc_state, OS%grid, use_temperature, do_integrals=.true., &
-                              gas_fields_ocn=gas_fields_ocn, use_meltpot=use_melt_pot)
+                              gas_fields_ocn=gas_fields_ocn, use_meltpot=use_melt_pot, &
+                              use_ice_shelf=OS%use_ice_shelf)
 
   call surface_forcing_init(Time_in, OS%grid, param_file, OS%diag, &
                             OS%forcing_CSp, OS%restore_salinity, OS%restore_temp)
@@ -824,8 +827,8 @@ subroutine convert_state_to_ocean_type(state, Ocean_sfc, G, patm, press_to_z)
     if (allocated(state%melt_potential)) &
       Ocean_sfc%melt_potential(i,j) = state%melt_potential(i+i0,j+j0)
     !AA TODO: uncomment the following line and pass the melt rate here !!!!
-    !if (allocated(state%melt_rate)) &
-    !  Ocean_sfc%melt_rate(i,j) = state%melt_rate(i+i0,j+j0)
+    if (allocated(state%melt_rate)) &
+      Ocean_sfc%melt_rate(i,j) = state%melt_rate(i+i0,j+j0)
     if (allocated(state%Hml)) &
       Ocean_sfc%OBLD(i,j) = state%Hml(i+i0,j+j0)
   enddo ; enddo

src/core/MOM_variables.F90

@@ -42,6 +42,7 @@ module MOM_variables
                 !! used, that is compensated for in sea_lev.
     melt_potential, & !< instantaneous amount of heat that can be used to melt sea ice,
                       !! in J m-2. This is computed w.r.t. surface freezing temperature.
+    melt_rate, &   !< Sub-ice-shelf melt rate, in kg m-2 s-1.
     ocean_mass, &  !< The total mass of the ocean in kg m-2.
     ocean_heat, &  !< The total heat content of the ocean in C kg m-2.
     ocean_salt, &  !< The total salt content of the ocean in kgSalt m-2.
@@ -292,7 +293,7 @@ module MOM_variables
 !> Allocates the fields for the surface (return) properties of
 !! the ocean model. Unused fields are unallocated.
 subroutine allocate_surface_state(sfc_state, G, use_temperature, do_integrals, &
-                                  gas_fields_ocn, use_meltpot)
+                                  gas_fields_ocn, use_meltpot, use_ice_shelf)
   type(ocean_grid_type), intent(in)    :: G                !< ocean grid structure
   type(surface),         intent(inout) :: sfc_state        !< ocean surface state type to be allocated.
   logical,     optional, intent(in)    :: use_temperature  !< If true, allocate the space for thermodynamic variables.
@@ -304,10 +305,11 @@ subroutine allocate_surface_state(sfc_state, G, use_temperature, do_integrals, &
                                               !! in the calculation of additional gas or other
                                               !! tracer fluxes, and can be used to spawn related
                                               !! internal variables in the ice model.
-  logical,     optional, intent(in)    :: use_meltpot      !< If true, allocate the space for melt potential
+  logical,     optional, intent(in)    :: use_meltpot   !< If true, allocate the space for melt potential
+  logical,     optional, intent(in)    :: use_ice_shelf !< If true, allocate the space for sub-ice-shelf melt rate
 
   ! local variables
-  logical :: use_temp, alloc_integ, use_melt_potential
+  logical :: use_temp, alloc_integ, use_melt_potential, ice_shelf
   integer :: is, ie, js, je, isd, ied, jsd, jed
   integer :: isdB, iedB, jsdB, jedB
 
@@ -318,6 +320,7 @@ subroutine allocate_surface_state(sfc_state, G, use_temperature, do_integrals, &
   use_temp = .true. ; if (present(use_temperature)) use_temp = use_temperature
   alloc_integ = .true. ; if (present(do_integrals)) alloc_integ = do_integrals
   use_melt_potential = .false. ; if (present(use_meltpot)) use_melt_potential = use_meltpot
+  ice_shelf = .false. ; if (present(use_ice_shelf)) ice_shelf = use_ice_shelf
 
   if (sfc_state%arrays_allocated) return
 
@@ -336,6 +339,10 @@ subroutine allocate_surface_state(sfc_state, G, use_temperature, do_integrals, &
     allocate(sfc_state%melt_potential(isd:ied,jsd:jed)) ; sfc_state%melt_potential(:,:) = 0.0
   endif
 
+  if (ice_shelf) then
+    allocate(sfc_state%melt_rate(isd:ied,jsd:jed)) ; sfc_state%melt_rate(:,:) = 0.0
+  endif
+
   if (alloc_integ) then
     ! Allocate structures for the vertically integrated ocean_mass, ocean_heat, and ocean_salt.
     allocate(sfc_state%ocean_mass(isd:ied,jsd:jed)) ; sfc_state%ocean_mass(:,:) = 0.0
@@ -360,6 +367,7 @@ subroutine deallocate_surface_state(sfc_state)
 
   if (.not.sfc_state%arrays_allocated) return
 
+  if (allocated(sfc_state%melt_rate)) deallocate(sfc_state%melt_rate)
   if (allocated(sfc_state%melt_potential)) deallocate(sfc_state%melt_potential)
   if (allocated(sfc_state%SST)) deallocate(sfc_state%SST)
   if (allocated(sfc_state%SSS)) deallocate(sfc_state%SSS)

src/ice_shelf/MOM_ice_shelf.F90

@@ -940,6 +940,10 @@ subroutine add_shelf_flux(G, CS, state, fluxes)
         fluxes%evap(i,j) = frac_area*ISS%water_flux(i,j)*CS%flux_factor
       endif
     endif
+    ! the following is used to pass melt rate (kg/(m^2 s)) to the MCT cap
+    ! so that CISM can use it
+    if (allocated(state%melt_rate)) &
+      state%melt_rate(i,j) =  frac_area*ISS%water_flux(i,j)*CS%flux_factor
 
     if (associated(fluxes%sens)) &
       fluxes%sens(i,j) = -frac_area*ISS%tflux_ocn(i,j)*CS%flux_factor