ndep is passed from ATM to LND, but not ATM to OCN

[mnlevy1981]

I tried to modify the MOM6 MARBL driver to receive nitrogen deposition from the mediator instead of reading it in from a file, but the fields were all 0. I turned on mediator history files, and saw atmImp_Faxa_ndep1 and atmImp_Faxa_ndep2 but no corresponding ocnExp fields. I emailed @mvertens who provided me with a fix:

$ git diff
diff --git a/mediator/esmFldsExchange_cesm_mod.F90 b/mediator/esmFldsExchange_cesm_mod.F90
index 149c779..9b8f7b1 100644
--- a/mediator/esmFldsExchange_cesm_mod.F90
+++ b/mediator/esmFldsExchange_cesm_mod.F90
@@ -1963,6 +1963,21 @@ subroutine esmFldsExchange_cesm(gcomp, phase, rc)
        end if
     end if

+    ! ---------------------------------------------------------------------
+    ! to ocn: nitrogen deposition fields from atm
+    ! ---------------------------------------------------------------------
+    if (phase == 'advertise') then
+       call addfld_to(compocn, 'Faxa_ndep')
+       call addfld_from(compatm, 'Faxa_ndep')
+    else
+       if ( fldchk(is_local%wrap%FBImp(compatm,compatm), 'Faxa_ndep', rc=rc) .and. &
+            fldchk(is_local%wrap%FBExp(compocn)        , 'Faxa_ndep', rc=rc)) then
+          call addmap_from(compatm, 'Faxa_ndep', compocn, mapconsf, 'one', atm2ocn_map)
+          call addmrg_to(compocn, 'Faxa_ndep', &
+               mrg_from=compatm, mrg_fld='Faxa_ndep', mrg_type='copy_with_weights', mrg_fracname='ofrac')
+       end if
+    end if
+
     ! ---------------------------------------------------------------------
     ! to ocn: enthalpy from atm rain, snow, evaporation
     ! to ocn: enthalpy from liquid and ice river runoff

I think I need to set up my fork of this repository and then create a branch, but a PR with the above patch will be coming soon.