Update halos for hbl in LBM

The get_MLD and get_BLD routines only return boundary layer depths
on the T-grid's computational domain leading to striping when
calculating the LBM fluxes. Adding a halo update for this variable
fixes the problem

src/tracer/MOM_lateral_boundary_mixing.F90

@@ -6,6 +6,7 @@ module MOM_lateral_boundary_mixing
 
 use MOM_cpu_clock,             only : cpu_clock_id, cpu_clock_begin, cpu_clock_end
 use MOM_cpu_clock,             only : CLOCK_MODULE, CLOCK_ROUTINE
+use MOM_domains,               only : pass_var
 use MOM_diag_mediator,         only : diag_ctrl, time_type
 use MOM_diag_mediator,         only : post_data, register_diag_field
 use MOM_error_handler,         only : MOM_error, FATAL, WARNING, MOM_mesg, is_root_pe
@@ -142,6 +143,8 @@ subroutine lateral_boundary_mixing(G, GV, US, h, Coef_x, Coef_y, dt, Reg, CS)
   if (ASSOCIATED(CS%KPP_CSp)) call KPP_get_BLD(CS%KPP_CSp, hbl, G)
   if (ASSOCIATED(CS%energetic_PBL_CSp)) call energetic_PBL_get_MLD(CS%energetic_PBL_CSp, hbl, G, US)
 
+  call pass_var(hbl,G%Domain)
+
   do m = 1,Reg%ntr
     tracer => Reg%tr(m)
     do j = G%jsc-1, G%jec+1
@@ -154,6 +157,8 @@ subroutine lateral_boundary_mixing(G, GV, US, h, Coef_x, Coef_y, dt, Reg, CS)
     ! Diffusive fluxes in the i-direction
     uFlx(:,:,:) = 0.
     vFlx(:,:,:) = 0.
+    uFlx_bulk(:,:) = 0.
+    vFlx_bulk(:,:) = 0.
     if ( CS%method == 1 ) then
       do j=G%jsc,G%jec
         do i=G%isc-1,G%iec
@@ -183,10 +188,10 @@ subroutine lateral_boundary_mixing(G, GV, US, h, Coef_x, Coef_y, dt, Reg, CS)
     enddo ; enddo ; enddo
 
     ! Post the tracer diagnostics
-    if (tracer%id_lbm_bulk_dfx>0) call post_data(tracer%id_lbm_bulk_dfx, uFlx_bulk, CS%diag) 
-    if (tracer%id_lbm_bulk_dfy>0) call post_data(tracer%id_lbm_bulk_dfy, vFlx_bulk, CS%diag) 
-    if (tracer%id_lbm_dfx>0)      call post_data(tracer%id_lbm_dfx, uFlx, CS%diag) 
-    if (tracer%id_lbm_dfy>0)      call post_data(tracer%id_lbm_dfy, vFlx, CS%diag) 
+    if (tracer%id_lbm_bulk_dfx>0) call post_data(tracer%id_lbm_bulk_dfx, uFlx_bulk, CS%diag)
+    if (tracer%id_lbm_bulk_dfy>0) call post_data(tracer%id_lbm_bulk_dfy, vFlx_bulk, CS%diag)
+    if (tracer%id_lbm_dfx>0)      call post_data(tracer%id_lbm_dfx, uFlx, CS%diag)
+    if (tracer%id_lbm_dfy>0)      call post_data(tracer%id_lbm_dfy, vFlx, CS%diag)
 
   enddo