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MARBL: convert salt_flux to tracer flux and add to STF
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This is done for DIC, ALK, and related tracers.
This mimics uptake and release of these tracers by sea ice.
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@klindsay28
klindsay28 committed Aug 28, 2024
1 parent 5904666 commit 4acea91
Showing 1 changed file with 94 additions and 1 deletion.
95 changes: 94 additions & 1 deletion src/tracer/MARBL_tracers.F90
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,8 @@ module MARBL_tracers
integer :: alk_alt_co2_ind !< ALK_ALT_CO2 index
integer :: dic_ind !< DIC index
integer :: dic_alt_co2_ind !< DIC_ALT_CO2 index
integer :: abio_dic_ind !< ABIO_DIC index
integer :: abio_di14c_ind !< ABIO_DI14C index
end type tracer_ind_type

!> MOM needs to store some information about saved_state; besides providing these
Expand Down Expand Up @@ -183,6 +185,7 @@ module MARBL_tracers
!! because we already copy data into CS%STF; latter requires copying data and indices
!! so currently using temp_MARBL_diag for that.
integer, allocatable :: id_surface_flux_out(:) !< register_diag indices for surface_flux output
integer, allocatable :: id_surface_flux_from_salt_flux(:) !< register_diag indices for surface_flux from salt_flux
type(temp_MARBL_diag), allocatable :: interior_tendency_out(:) !< collect interior tendencies for diagnostic output
type(temp_MARBL_diag), allocatable :: interior_tendency_out_zint(:) !< vertical integral of interior tendencies
!! (full column)
Expand All @@ -192,6 +195,9 @@ module MARBL_tracers
integer, allocatable :: fracr_cat_id(:) !< register_diag index for per-category ice fraction
integer, allocatable :: qsw_cat_id(:) !< register_diag index for per-category shortwave

real :: DIC_salt_ratio !< ratio to convert salt surface flux to DIC surface flux [conc ppt-1]
real :: ALK_salt_ratio !< ratio to convert salt surface flux to ALK surface flux [conc ppt-1]

real, allocatable :: STF(:,:,:) !< surface fluxes returned from MARBL to use in tracer_vertdiff
!! (dims: i, j, tracer) [conc Z T-1 ~> conc m s-1]
real, allocatable :: SFO(:,:,:) !< surface flux output returned from MARBL for use in GCM
Expand Down Expand Up @@ -703,7 +709,14 @@ function register_MARBL_tracers(HI, GV, US, param_file, CS, tr_Reg, restart_CS,
call log_param(param_file, mdl, "INPUTDIR/D14C_FILE", CS%d14c_dataset(m)%file_name)
endif
enddo
endif
endif

call get_param(param_file, mdl, "DIC_SALT_RATIO", CS%DIC_salt_ratio, &
"Ratio to convert salt surface flux to DIC surface flux", units="conc ppt-1", &
default=64.0)
call get_param(param_file, mdl, "ALK_SALT_RATIO", CS%ALK_salt_ratio, &
"Ratio to convert salt surface flux to ALK surface flux", units="conc ppt-1", &
default=70.0)

! ** Tracer Restoring
call get_param(param_file, mdl, "MARBL_TRACER_RESTORING_SOURCE", CS%restoring_source, &
Expand Down Expand Up @@ -858,6 +871,7 @@ subroutine initialize_MARBL_tracers(restart, day, G, GV, US, h, param_file, diag

! Register per-tracer diagnostics computed from MARBL surface flux / interior tendency values
allocate(CS%id_surface_flux_out(CS%ntr))
allocate(CS%id_surface_flux_from_salt_flux(CS%ntr))
allocate(CS%interior_tendency_out(CS%ntr))
allocate(CS%interior_tendency_out_zint(CS%ntr))
allocate(CS%interior_tendency_out_zint_100m(CS%ntr))
Expand All @@ -869,6 +883,12 @@ subroutine initialize_MARBL_tracers(restart, day, G, GV, US, h, param_file, diag
diag%axesT1, & ! T => tracer grid? 1 => no vertical grid
day, trim(longname), trim(units), conversion=US%Z_to_m*US%s_to_T)

write(name, "(2A)") "STF_SALT_", trim(MARBL_instances%tracer_metadata(m)%short_name)
write(longname, "(2A)") trim(MARBL_instances%tracer_metadata(m)%long_name), " Surface Flux from Salt Flux"
CS%id_surface_flux_from_salt_flux(m) = register_diag_field("ocean_model", trim(name), &
diag%axesT1, & ! T => tracer grid? 1 => no vertical grid
day, trim(longname), trim(units), conversion=US%Z_to_m*US%s_to_T)

write(name, "(2A)") "J_", trim(MARBL_instances%tracer_metadata(m)%short_name)
write(longname, "(2A)") trim(MARBL_instances%tracer_metadata(m)%long_name), " Source Sink Term"
write(units, "(2A)") trim(MARBL_instances%tracer_metadata(m)%units), "/s"
Expand Down Expand Up @@ -1239,6 +1259,10 @@ subroutine MARBL_tracers_column_physics(h_old, h_new, ea, eb, fluxes, dt, G, GV,

! Local variables
character(len=256) :: log_message
real, dimension(SZI_(G),SZJ_(G)) :: net_salt_rate !< Surface salt flux into the ocean
!! [S H T-1 ~> ppt m s-1 or ppt kg m-2 s-1].
real, dimension(SZI_(G),SZJ_(G)) :: flux_from_salt_flux !< Surface tracer flux from salt flux
!! [conc Z T-1 ~> conc m s-1].
real, dimension(SZI_(G),SZJ_(G)) :: ref_mask ! Mask for 2D MARBL diags using ref_depth
real, dimension(SZI_(G),SZJ_(G)) :: riv_flux_loc ! Local copy of CS%RIV_FLUXES*dt
real, dimension(SZI_(G),SZJ_(G),SZK_(G)) :: h_work ! Used so that h can be modified
Expand Down Expand Up @@ -1368,6 +1392,69 @@ subroutine MARBL_tracers_column_physics(h_old, h_new, ea, eb, fluxes, dt, G, GV,
enddo
enddo

! convert salt flux to tracer fluxes and add to STF
do j=js,je ; do i=is,ie
net_salt_rate(i,j) = (1000.0*US%ppt_to_S * fluxes%salt_flux(i,j)) * GV%RZ_to_H
enddo ; enddo

! DIC related tracers
do j=js,je ; do i=is,ie
flux_from_salt_flux(i,j) = (CS%DIC_salt_ratio * GV%H_to_Z) * net_salt_rate(i,j)
enddo ; enddo
m = CS%tracer_inds%dic_ind
if (m > 0) then
do j=js,je ; do i=is,ie
CS%STF(i,j,m) = CS%STF(i,j,m) + flux_from_salt_flux(i,j)
enddo ; enddo
if (CS%id_surface_flux_from_salt_flux(m) > 0) &
call post_data(CS%id_surface_flux_from_salt_flux(m), flux_from_salt_flux, CS%diag)
endif
m = CS%tracer_inds%dic_alt_co2_ind
if (m > 0) then
do j=js,je ; do i=is,ie
CS%STF(i,j,m) = CS%STF(i,j,m) + flux_from_salt_flux(i,j)
enddo ; enddo
if (CS%id_surface_flux_from_salt_flux(m) > 0) &
call post_data(CS%id_surface_flux_from_salt_flux(m), flux_from_salt_flux, CS%diag)
endif
m = CS%tracer_inds%abio_dic_ind
if (m > 0) then
do j=js,je ; do i=is,ie
CS%STF(i,j,m) = CS%STF(i,j,m) + flux_from_salt_flux(i,j)
enddo ; enddo
if (CS%id_surface_flux_from_salt_flux(m) > 0) &
call post_data(CS%id_surface_flux_from_salt_flux(m), flux_from_salt_flux, CS%diag)
endif
m = CS%tracer_inds%abio_di14c_ind
if (m > 0) then
do j=js,je ; do i=is,ie
CS%STF(i,j,m) = CS%STF(i,j,m) + flux_from_salt_flux(i,j)
enddo ; enddo
if (CS%id_surface_flux_from_salt_flux(m) > 0) &
call post_data(CS%id_surface_flux_from_salt_flux(m), flux_from_salt_flux, CS%diag)
endif

! ALK related tracers
do j=js,je ; do i=is,ie
flux_from_salt_flux(i,j) = (CS%ALK_salt_ratio * GV%H_to_Z) * net_salt_rate(i,j)
enddo ; enddo
m = CS%tracer_inds%alk_ind
if (m > 0) then
do j=js,je ; do i=is,ie
CS%STF(i,j,m) = CS%STF(i,j,m) + flux_from_salt_flux(i,j)
enddo ; enddo
if (CS%id_surface_flux_from_salt_flux(m) > 0) &
call post_data(CS%id_surface_flux_from_salt_flux(m), flux_from_salt_flux, CS%diag)
endif
m = CS%tracer_inds%alk_alt_co2_ind
if (m > 0) then
do j=js,je ; do i=is,ie
CS%STF(i,j,m) = CS%STF(i,j,m) + flux_from_salt_flux(i,j)
enddo ; enddo
if (CS%id_surface_flux_from_salt_flux(m) > 0) &
call post_data(CS%id_surface_flux_from_salt_flux(m), flux_from_salt_flux, CS%diag)
endif

if (CS%debug) then
do m=1,CS%ntr
call hchksum(CS%STF(:,:,m), &
Expand Down Expand Up @@ -2061,6 +2148,8 @@ subroutine set_riv_flux_tracer_inds(CS)
CS%tracer_inds%alk_alt_co2_ind = 0
CS%tracer_inds%dic_ind = 0
CS%tracer_inds%dic_alt_co2_ind = 0
CS%tracer_inds%abio_dic_ind = 0
CS%tracer_inds%abio_di14c_ind = 0
do m=1,CS%ntr
name = MARBL_instances%tracer_metadata(m)%short_name
if (trim(name) == "NO3") then
Expand Down Expand Up @@ -2091,6 +2180,10 @@ subroutine set_riv_flux_tracer_inds(CS)
CS%tracer_inds%dic_ind = m
elseif (trim(name) == "DIC_ALT_CO2") then
CS%tracer_inds%dic_alt_co2_ind = m
elseif (trim(name) == "ABIO_DIC") then
CS%tracer_inds%abio_dic_ind = m
elseif (trim(name) == "ABIO_DI14C") then
CS%tracer_inds%abio_di14c_ind = m
endif
enddo

Expand Down

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