+*Pass visc%h_ML to call_tracer_column_fns

  Added the optional argument h_BL to call_tracer_column_fns, and then pass
visc%h_ML to this routine as a part of the calls from the diabatic routines.
This argument is not provided in adiabatic mode or in offline tracer mode, which
is why it has been made optional.  All answers are bitwise identical in
Boussinesq mode but ideal age tracers can change in non-Boussinesq mode due to
the updates to the layer specific volumes between the calculation of the
boundary layer properties and the calls to call_tracer_column_fns.

src/parameterizations/vertical/MOM_diabatic_driver.F90

@@ -1073,7 +1073,7 @@ subroutine diabatic_ALE_legacy(u, v, h, tv, BLD, fluxes, visc, ADp, CDp, dt, Tim
                               KPP_CSp=CS%KPP_CSp, &
                               nonLocalTrans=KPP_NLTscalar, &
                               evap_CFL_limit=CS%evap_CFL_limit, &
-                              minimum_forcing_depth=CS%minimum_forcing_depth)
+                              minimum_forcing_depth=CS%minimum_forcing_depth, h_BL=visc%h_ML)
 
   call cpu_clock_end(id_clock_tracers)
 
@@ -1587,7 +1587,7 @@ subroutine diabatic_ALE(u, v, h, tv, BLD, fluxes, visc, ADp, CDp, dt, Time_end,
                               KPP_CSp=CS%KPP_CSp, &
                               nonLocalTrans=KPP_NLTscalar, &
                               evap_CFL_limit=CS%evap_CFL_limit, &
-                              minimum_forcing_depth=CS%minimum_forcing_depth)
+                              minimum_forcing_depth=CS%minimum_forcing_depth, h_BL=visc%h_ML)
 
   call cpu_clock_end(id_clock_tracers)
 
@@ -2381,8 +2381,7 @@ subroutine layered_diabatic(u, v, h, tv, BLD, fluxes, visc, ADp, CDp, dt, Time_e
 
     call call_tracer_column_fns(hold, h, eatr, ebtr, fluxes, BLD, dt, G, GV, US, tv, &
                               CS%optics, CS%tracer_flow_CSp, CS%debug, &
-                              KPP_CSp=CS%KPP_CSp, &
-                              nonLocalTrans=KPP_NLTscalar)
+                              KPP_CSp=CS%KPP_CSp, nonLocalTrans=KPP_NLTscalar, h_BL=visc%h_ML)
 
   elseif (CS%double_diffuse) then  ! extra diffusivity for passive tracers
 
@@ -2403,14 +2402,12 @@ subroutine layered_diabatic(u, v, h, tv, BLD, fluxes, visc, ADp, CDp, dt, Time_e
 
     call call_tracer_column_fns(hold, h, eatr, ebtr, fluxes, BLD, dt, G, GV, US, tv, &
                                 CS%optics, CS%tracer_flow_CSp, CS%debug, &
-                                KPP_CSp=CS%KPP_CSp, &
-                                nonLocalTrans=KPP_NLTscalar)
+                                KPP_CSp=CS%KPP_CSp, nonLocalTrans=KPP_NLTscalar, h_BL=visc%h_ML)
 
   else
     call call_tracer_column_fns(hold, h, ea, eb, fluxes, BLD, dt, G, GV, US, tv, &
                                 CS%optics, CS%tracer_flow_CSp, CS%debug, &
-                                KPP_CSp=CS%KPP_CSp, &
-                                nonLocalTrans=KPP_NLTscalar)
+                                KPP_CSp=CS%KPP_CSp, nonLocalTrans=KPP_NLTscalar, h_BL=visc%h_ML)
 
   endif  ! (CS%mix_boundary_tracers)
 

src/parameterizations/vertical/MOM_set_viscosity.F90

@@ -2693,7 +2693,7 @@ subroutine set_visc_register_restarts(HI, G, GV, US, param_file, visc, restart_C
   logical,                 intent(in) :: use_ice_shelf !< if true, register tau_shelf restarts
   ! Local variables
   logical :: use_kappa_shear, KS_at_vertex
-  logical :: adiabatic, useKPP, useEPBL
+  logical :: adiabatic, useKPP, useEPBL, use_ideal_age
   logical :: do_brine_plume, use_hor_bnd_diff, use_neutral_diffusion, use_fpmix
   logical :: use_CVMix_shear, MLE_use_PBL_MLD, MLE_use_Bodner, use_CVMix_conv
   integer :: isd, ied, jsd, jed, nz
@@ -2777,12 +2777,14 @@ subroutine set_visc_register_restarts(HI, G, GV, US, param_file, visc, restart_C
                  default=.false., do_not_log=.true.)
   call get_param(param_file, mdl, "FPMIX", use_fpmix, &
                  default=.false., do_not_log=.true.)
+  call get_param(param_file, mdl, "USE_IDEAL_AGE_TRACER", use_ideal_age, &
+                 default=.false., do_not_log=.true.)
 
   if (MLE_use_PBL_MLD) then
     call safe_alloc_ptr(visc%MLD, isd, ied, jsd, jed)
   endif
   if ((hfreeze >= 0.0) .or. MLE_use_PBL_MLD .or. do_brine_plume .or. use_fpmix .or. &
-      use_neutral_diffusion .or. use_hor_bnd_diff) then
+      use_neutral_diffusion .or. use_hor_bnd_diff .or. use_ideal_age) then
     call safe_alloc_ptr(visc%h_ML, isd, ied, jsd, jed)
   endif
 

src/tracer/MOM_tracer_flow_control.F90

@@ -429,7 +429,7 @@ end subroutine call_tracer_set_forcing
 
 !> This subroutine calls all registered tracer column physics subroutines.
 subroutine call_tracer_column_fns(h_old, h_new, ea, eb, fluxes, mld, dt, G, GV, US, tv, optics, CS, &
-                                  debug, KPP_CSp, nonLocalTrans, evap_CFL_limit, minimum_forcing_depth)
+                                  debug, KPP_CSp, nonLocalTrans, evap_CFL_limit, minimum_forcing_depth, h_BL)
   type(ocean_grid_type),                 intent(in) :: G      !< The ocean's grid structure.
   type(verticalGrid_type),               intent(in) :: GV     !< The ocean's vertical grid structure.
   real, dimension(SZI_(G),SZJ_(G),SZK_(GV)), intent(in) :: h_old !< Layer thickness before entrainment
@@ -464,9 +464,11 @@ subroutine call_tracer_column_fns(h_old, h_new, ea, eb, fluxes, mld, dt, G, GV,
                                                               !! of the top layer in a timestep [nondim]
   real,                        optional, intent(in) :: minimum_forcing_depth !< The smallest depth over
                                                               !! which fluxes can be applied [H ~> m or kg m-2]
+  real, dimension(:,:),        optional, pointer    :: h_BL   !< Thickness of active mixing layer [H ~> m or kg m-2]
 
   ! Local variables
   real :: Hbl(SZI_(G),SZJ_(G))    !< Boundary layer thickness [H ~> m or kg m-2]
+  logical :: use_h_BL
 
   if (.not. associated(CS)) call MOM_error(FATAL, "call_tracer_column_fns: "// &
          "Module must be initialized via call_tracer_register before it is used.")
@@ -493,7 +495,12 @@ subroutine call_tracer_column_fns(h_old, h_new, ea, eb, fluxes, mld, dt, G, GV,
                                         evap_CFL_limit=evap_CFL_limit, &
                                         minimum_forcing_depth=minimum_forcing_depth)
     if (CS%use_ideal_age) then
-      call convert_MLD_to_ML_thickness(mld, h_new, Hbl, tv, G, GV)
+      use_h_BL = .false. ; if (present(h_BL)) use_h_BL = associated(h_BL)
+      if (present(h_BL)) then
+        Hbl(:,:) = h_BL(:,:)
+      else  ! This option is here mostly to support the offline tracers.
+        call convert_MLD_to_ML_thickness(mld, h_new, Hbl, tv, G, GV)
+      endif
       call ideal_age_tracer_column_physics(h_old, h_new, ea, eb, fluxes, dt, &
                                            G, GV, US, CS%ideal_age_tracer_CSp, &
                                            evap_CFL_limit=evap_CFL_limit, &
@@ -573,7 +580,12 @@ subroutine call_tracer_column_fns(h_old, h_new, ea, eb, fluxes, mld, dt, G, GV,
       call RGC_tracer_column_physics(h_old, h_new, ea, eb, fluxes, dt, &
                                       G, GV, US, CS%RGC_tracer_CSp)
     if (CS%use_ideal_age) then
-      call convert_MLD_to_ML_thickness(mld, h_new, Hbl, tv, G, GV)
+      use_h_BL = .false. ; if (present(h_BL)) use_h_BL = associated(h_BL)
+      if (present(h_BL)) then
+        Hbl(:,:) = h_BL(:,:)
+      else  ! This option is here mostly to support the offline tracers.
+        call convert_MLD_to_ML_thickness(mld, h_new, Hbl, tv, G, GV)
+      endif
       call ideal_age_tracer_column_physics(h_old, h_new, ea, eb, fluxes, dt, &
                                            G, GV, US, CS%ideal_age_tracer_CSp, Hbl=Hbl)
     endif