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change t-freeze calcualtion for sppt #10

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Aug 25, 2022
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change t-freeze calcualtion for sppt #10

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38 changes: 33 additions & 5 deletions src/parameterizations/vertical/MOM_diabatic_driver.F90
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Original file line number Diff line number Diff line change
Expand Up @@ -299,6 +299,11 @@ subroutine diabatic(u, v, h, tv, Hml, fluxes, visc, ADp, CDp, dt, Time_end, &
real, dimension(SZI_(G),SZJ_(G),CS%nMode) :: &
cn_IGW ! baroclinic internal gravity wave speeds [L T-1 ~> m s-1]
real, dimension(SZI_(G),SZJ_(G),SZK_(GV)) :: temp_diag ! Previous temperature for diagnostics [C ~> degC]
real, dimension(SZI_(G)) :: T_freeze, & ! The freezing potential temperature at the current salinity [C ~> degC].
ps ! Surface pressure [R L2 T-2 ~> Pa]
real, dimension(SZI_(G),SZK_(GV)) :: &
pressure ! The pressure at the middle of each layer [R L2 T-2 ~> Pa].
real :: H_to_RL2_T2 ! A conversion factor from thicknesses in H to pressure [R L2 T-2 H-1 ~> Pa m-1 or Pa m2 kg-1]
integer :: i, j, k, m, is, ie, js, je, nz
logical :: showCallTree ! If true, show the call tree

Expand Down Expand Up @@ -447,11 +452,34 @@ subroutine diabatic(u, v, h, tv, Hml, fluxes, visc, ADp, CDp, dt, Time_end, &
if (stoch_CS%do_sppt) then
! perturb diabatic tendencies.
! These stochastic perturbations do not conserve heat, salt or mass.
do k=1,nz ; do j=js,je ; do i=is,ie
h(i,j,k) = max(h_in(i,j,k) + (h(i,j,k)-h_in(i,j,k)) * stoch_CS%sppt_wts(i,j), GV%Angstrom_H)
tv%S(i,j,k) = max(s_in(i,j,k) + (tv%S(i,j,k)-s_in(i,j,k)) * stoch_CS%sppt_wts(i,j), 0.0)
tv%T(i,j,k) = max(t_in(i,j,k) + (tv%T(i,j,k)-t_in(i,j,k)) * stoch_CS%sppt_wts(i,j), -0.054*tv%S(i,j,k))
enddo ; enddo ; enddo
do k=1,nz; do j=js,je; do i=is,ie
h(i,j,k) = max(h_in(i,j,k) + (h(i,j,k)-h_in(i,j,k)) * stoch_CS%sppt_wts(i,j), GV%Angstrom_H)
tv%S(i,j,k) = max(s_in(i,j,k) + (tv%S(i,j,k)-s_in(i,j,k)) * stoch_CS%sppt_wts(i,j), 0.0)
enddo; enddo; enddo
! now that we have updated thickness and salinity, calculate freeing point
H_to_RL2_T2 = GV%H_to_RZ * GV%g_Earth
do j=js,je
ps(:) = 0.0
if (associated(fluxes%p_surf)) then ; do i=is,ie
ps(i) = fluxes%p_surf(i,j)
enddo ; endif

do i=is,ie
pressure(i,1) = ps(i) + (0.5*H_to_RL2_T2)*h(i,j,1)
enddo
do k=2,nz ; do i=is,ie
pressure(i,k) = pressure(i,k-1) + &
(0.5*H_to_RL2_T2) * (h(i,j,k) + h(i,j,k-1))
enddo ; enddo
do k=1,nz
call calculate_TFreeze(tv%S(is:ie,j,k), pressure(is:ie,k), T_freeze(is:ie), &
tv%eqn_of_state)
do i=is,ie
tv%T(i,j,k) = max(t_in(i,j,k) + (tv%T(i,j,k)-t_in(i,j,k)) * stoch_CS%sppt_wts(i,j), T_freeze(i))
enddo
enddo
enddo

deallocate(h_in, t_in, s_in)
endif

Expand Down