diff --git a/tools/fv_diagnostics.F90 b/tools/fv_diagnostics.F90
index 40a3d7af9..3697ff1ff 100644
--- a/tools/fv_diagnostics.F90
+++ b/tools/fv_diagnostics.F90
@@ -960,6 +960,10 @@ subroutine fv_diag_init(Atm, axes, Time, npx, npy, npz, p_ref)
           !            'Relative Humidity', '%', missing_value=missing_value, range=rhrange )
           id_delp = register_diag_field ( trim(field), 'delp', axes(1:3), Time,        &
                'pressure thickness'//massdef_str, 'pa', missing_value=missing_value )
+#ifdef GFS_PHYS
+          id_delp_total = register_diag_field ( trim(field), 'delp_total', axes(1:3), Time,        &
+               'FV3 pressure thickness (dry air + all water species)', 'pa', missing_value=missing_value )
+#endif
           if ( .not. Atm(n)%flagstruct%hydrostatic )                                        &
                id_delz = register_diag_field ( trim(field), 'delz', axes(1:3), Time,        &
                'height thickness', 'm', missing_value=missing_value )
@@ -3012,7 +3016,6 @@ subroutine fv_diag(Atm, zvir, Time, print_freq)
           endif
        endif
 
-
 #ifdef GFS_PHYS
        if(id_delp > 0 .or. id_cape > 0 .or. id_cin > 0 .or. &
             ((.not. Atm(n)%flagstruct%hydrostatic) .and. (id_pfnh > 0 .or. id_ppnh > 0)) .or. &
@@ -3026,6 +3029,7 @@ subroutine fv_diag(Atm, zvir, Time, print_freq)
           enddo
           if (id_delp > 0) used=send_data(id_delp, wk, Time)
        endif
+       if(id_delp_total > 0) used=send_data(id_delp_total, Atm(n)%delp(isc:iec,jsc:jec,:), Time)
 #else
        if(id_delp > 0) used=send_data(id_delp, Atm(n)%delp(isc:iec,jsc:jec,:), Time)
 #endif
diff --git a/tools/fv_diagnostics.h b/tools/fv_diagnostics.h
index 8914f30c3..d745cd2e6 100644
--- a/tools/fv_diagnostics.h
+++ b/tools/fv_diagnostics.h
@@ -105,4 +105,7 @@
      integer :: id_uw, id_vw
      integer :: id_lagrangian_tendency_of_hydrostatic_pressure
      integer :: id_t_dt_nudge, id_ps_dt_nudge, id_delp_dt_nudge, id_u_dt_nudge, id_v_dt_nudge
+#ifdef GFS_PHYS
+     integer :: id_delp_total
+#endif
 #endif _FV_DIAG__