mom_checksum_packages Module Reference

Detailed Description

Provides routines that do checksums of groups of MOM variables.

Data Types
interface	mom_state_chksum
	Write out checksums of the MOM6 state variables. More...
type	stats
	A type for storing statistica about a variable. More...

Functions/Subroutines
subroutine	mom_state_chksum_5arg (mesg, u, v, h, uh, vh, G, GV, haloshift, symmetric)
	Write out chksums for the model's basic state variables, including transports. More...
subroutine	mom_state_chksum_3arg (mesg, u, v, h, G, GV, haloshift, symmetric)
	Write out chksums for the model's basic state variables. More...
subroutine, public	mom_thermo_chksum (mesg, tv, G, haloshift)
	Write out chksums for the model's thermodynamic state variables. More...
subroutine, public	mom_surface_chksum (mesg, sfc, G, haloshift, symmetric)
	Write out chksums for the ocean surface variables. More...
subroutine, public	mom_accel_chksum (mesg, CAu, CAv, PFu, PFv, diffu, diffv, G, GV, US, pbce, u_accel_bt, v_accel_bt, symmetric)
	Write out chksums for the model's accelerations. More...
subroutine, public	mom_state_stats (mesg, u, v, h, Temp, Salt, G, allowChange, permitDiminishing)
	Monitor and write out statistics for the model's state variables. More...

Function/Subroutine Documentation

mom_accel_chksum()

subroutine, public mom_checksum_packages::mom_accel_chksum	(	character(len=*), intent(in)	mesg,
		real, dimension( g %isdb: g %iedb, g %jsd: g %jed, g %ke), intent(in)	CAu,
		real, dimension( g %isd: g %ied, g %jsdb: g %jedb, g %ke), intent(in)	CAv,
		real, dimension( g %isdb: g %iedb, g %jsd: g %jed, g %ke), intent(in)	PFu,
		real, dimension( g %isd: g %ied, g %jsdb: g %jedb, g %ke), intent(in)	PFv,
		real, dimension( g %isdb: g %iedb, g %jsd: g %jed, g %ke), intent(in)	diffu,
		real, dimension( g %isd: g %ied, g %jsdb: g %jedb, g %ke), intent(in)	diffv,
		type(ocean_grid_type), intent(in)	G,
		type(verticalgrid_type), intent(in)	GV,
		type(unit_scale_type), intent(in)	US,
		real, dimension( g %isd: g %ied, g %jsd: g %jed, g %ke), intent(in), optional	pbce,
		real, dimension( g %isdb: g %iedb, g %jsd: g %jed, g %ke), intent(in), optional	u_accel_bt,
		real, dimension( g %isd: g %ied, g %jsdb: g %jedb, g %ke), intent(in), optional	v_accel_bt,
		logical, intent(in), optional	symmetric
	)

Write out chksums for the model's accelerations.

Parameters

[in]	mesg	A message that appears on the chksum lines.
[in]	g	The ocean's grid structure.
[in]	gv	The ocean's vertical grid structure.
[in]	cau	Zonal acceleration due to Coriolis
[in]	cav	Meridional acceleration due to Coriolis
[in]	pfu	Zonal acceleration due to pressure gradients
[in]	pfv	Meridional acceleration due to pressure gradients
[in]	diffu	Zonal acceleration due to convergence of the
[in]	diffv	Meridional acceleration due to convergence of
[in]	us	A dimensional unit scaling type
[in]	pbce	The baroclinic pressure anomaly in each layer
[in]	u_accel_bt	The zonal acceleration from terms in the
[in]	v_accel_bt	The meridional acceleration from terms in
[in]	symmetric	If true, do checksums on the fully symmetric computationoal domain.

Definition at line 164 of file MOM_checksum_packages.F90.

  character(len=*),         intent(in) :: mesg !< A message that appears on the chksum lines.
  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(SZIB_(G),SZJ_(G),SZK_(G)), &
                            intent(in) :: CAu  !< Zonal acceleration due to Coriolis
                                               !! and momentum advection terms [m s-2].
  real, dimension(SZI_(G),SZJB_(G),SZK_(G)), &
                            intent(in) :: CAv  !< Meridional acceleration due to Coriolis
                                               !! and momentum advection terms [m s-2].
  real, dimension(SZIB_(G),SZJ_(G),SZK_(G)), &
                            intent(in) :: PFu  !< Zonal acceleration due to pressure gradients
                                               !! (equal to -dM/dx) [m s-2].
  real, dimension(SZI_(G),SZJB_(G),SZK_(G)), &
                            intent(in) :: PFv  !< Meridional acceleration due to pressure gradients
                                               !! (equal to -dM/dy) [m s-2].
  real, dimension(SZIB_(G),SZJ_(G),SZK_(G)), &
                            intent(in) :: diffu !< Zonal acceleration due to convergence of the
                                                !! along-isopycnal stress tensor [m s-1 T-1 ~> m s-2].
  real, dimension(SZI_(G),SZJB_(G),SZK_(G)), &
                            intent(in) :: diffv !< Meridional acceleration due to convergence of
                                                !! the along-isopycnal stress tensor [m s-1 T-1 ~> m s-2].
  type(unit_scale_type),    intent(in) :: US    !< A dimensional unit scaling type
  real, dimension(SZI_(G),SZJ_(G),SZK_(G)),  &
                  optional, intent(in) :: pbce !< The baroclinic pressure anomaly in each layer
                                               !! due to free surface height anomalies
                                               !! [m2 s-2 H-1 ~> m s-2 or m4 s-2 kg-1].
  real, dimension(SZIB_(G),SZJ_(G),SZK_(G)), &
                  optional, intent(in) :: u_accel_bt !< The zonal acceleration from terms in the
                                                     !! barotropic solver [m s-2].
  real, dimension(SZI_(G),SZJB_(G),SZK_(G)), &
                  optional, intent(in) :: v_accel_bt !< The meridional acceleration from terms in
                                                     !! the barotropic solver [m s-2].
  logical,        optional, intent(in) :: symmetric !< If true, do checksums on the fully symmetric
                                                    !! computationoal domain.
 
  integer :: is, ie, js, je, nz
  logical :: sym
 
  is = g%isc ; ie = g%iec ; js = g%jsc ; je = g%jec ; nz = g%ke
  sym=.false.; if (present(symmetric)) sym=symmetric
 
  ! Note that for the chksum calls to be useful for reproducing across PE
  ! counts, there must be no redundant points, so all variables use is..ie
  ! and js...je as their extent.
  call uvchksum(mesg//" CA[uv]", cau, cav, g%HI, haloshift=0, symmetric=sym)
  call uvchksum(mesg//" PF[uv]", pfu, pfv, g%HI, haloshift=0, symmetric=sym)
  call uvchksum(mesg//" diffu", diffu, diffv, g%HI,haloshift=0, symmetric=sym, scale=us%s_to_T)
  if (present(pbce)) &
    call hchksum(pbce, mesg//" pbce",g%HI,haloshift=0, scale=gv%m_to_H*us%L_T_to_m_s**2)
  if (present(u_accel_bt) .and. present(v_accel_bt)) &
    call uvchksum(mesg//" [uv]_accel_bt", u_accel_bt, v_accel_bt, g%HI,haloshift=0, symmetric=sym)

mom_state_chksum_3arg()

subroutine mom_checksum_packages::mom_state_chksum_3arg ( character(len=*), intent(in)  mesg, real, dimension( g %isdb: g %iedb, g %jsd: g %jed, g %ke), intent(in)  u, real, dimension( g %isd: g %ied, g %jsdb: g %jedb, g %ke), intent(in)  v, real, dimension( g %isd: g %ied, g %jsd: g %jed, g %ke), intent(in)  h, type(ocean_grid_type), intent(in)  G, type(verticalgrid_type), intent(in)  GV, integer, intent(in), optional  haloshift, logical, intent(in), optional  symmetric  )

private

Write out chksums for the model's basic state variables.

Parameters

[in]	mesg	A message that appears on the chksum lines.
[in]	g	The ocean's grid structure.
[in]	gv	The ocean's vertical grid structure.
[in]	u	Zonal velocity [m s-1].
[in]	v	Meridional velocity [m s-1].
[in]	h	Layer thicknesses [H ~> m or kg m-2].
[in]	haloshift	The width of halos to check (default 0).
[in]	symmetric	If true, do checksums on the fully symmetric computationoal domain.

Definition at line 82 of file MOM_checksum_packages.F90.

  character(len=*),        intent(in) :: mesg !< A message that appears on the chksum lines.
  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(SZIB_(G),SZJ_(G),SZK_(G)), &
                           intent(in) :: u    !< Zonal velocity [m s-1].
  real, dimension(SZI_(G),SZJB_(G),SZK_(G)), &
                           intent(in) :: v    !< Meridional velocity [m s-1].
  real, dimension(SZI_(G),SZJ_(G),SZK_(G)),  &
                           intent(in) :: h    !< Layer thicknesses [H ~> m or kg m-2].
  integer,       optional, intent(in) :: haloshift !< The width of halos to check (default 0).
  logical,       optional, intent(in) :: symmetric !< If true, do checksums on the fully symmetric
                                                   !! computationoal domain.
 
  integer :: is, ie, js, je, nz, hs
  logical :: sym
  is = g%isc ; ie = g%iec ; js = g%jsc ; je = g%jec ; nz = g%ke
 
  ! Note that for the chksum calls to be useful for reproducing across PE
  ! counts, there must be no redundant points, so all variables use is..ie
  ! and js...je as their extent.
  hs=1; if (present(haloshift)) hs=haloshift
  sym=.false.; if (present(symmetric)) sym=symmetric
  call uvchksum(mesg//" u", u, v, g%HI,haloshift=hs, symmetric=sym)
  call hchksum(h, mesg//" h",g%HI, haloshift=hs, scale=gv%H_to_m)

mom_state_chksum_5arg()

subroutine mom_checksum_packages::mom_state_chksum_5arg ( character(len=*), intent(in)  mesg, real, dimension(szib_(g),szj_(g),szk_(g)), intent(in)  u, real, dimension(szi_(g),szjb_(g),szk_(g)), intent(in)  v, real, dimension(szi_(g),szj_(g),szk_(g)), intent(in)  h, real, dimension(szib_(g),szj_(g),szk_(g)), intent(in)  uh, real, dimension(szi_(g),szjb_(g),szk_(g)), intent(in)  vh, type(ocean_grid_type), intent(in)  G, type(verticalgrid_type), intent(in)  GV, integer, intent(in), optional  haloshift, logical, intent(in), optional  symmetric  )

private

Write out chksums for the model's basic state variables, including transports.

Parameters

[in]	mesg	A message that appears on the chksum lines.
[in]	g	The ocean's grid structure.
[in]	gv	The ocean's vertical grid structure.
[in]	u	The zonal velocity [m s-1].
[in]	v	The meridional velocity [m s-1].
[in]	h	Layer thicknesses [H ~> m or kg m-2].
[in]	uh	Volume flux through zonal faces = u*h*dy
[in]	vh	Volume flux through meridional faces = v*h*dx
[in]	haloshift	The width of halos to check (default 0).
[in]	symmetric	If true, do checksums on the fully symmetric computationoal domain.

Definition at line 43 of file MOM_checksum_packages.F90.

  character(len=*),                          &
                           intent(in) :: mesg !< A message that appears on the chksum lines.
  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(SZIB_(G),SZJ_(G),SZK_(G)), &
                           intent(in) :: u    !< The zonal velocity [m s-1].
  real, dimension(SZI_(G),SZJB_(G),SZK_(G)), &
                           intent(in) :: v    !< The meridional velocity [m s-1].
  real, dimension(SZI_(G),SZJ_(G),SZK_(G)),  &
                           intent(in) :: h    !< Layer thicknesses [H ~> m or kg m-2].
  real, dimension(SZIB_(G),SZJ_(G),SZK_(G)), &
                           intent(in) :: uh   !< Volume flux through zonal faces = u*h*dy
                                              !! [H m2 s-1 ~> m3 s-1 or kg s-1].
  real, dimension(SZI_(G),SZJB_(G),SZK_(G)), &
                           intent(in) :: vh   !< Volume flux through meridional faces = v*h*dx
                                              !! [H m2 s-1 ~> m3 s-1 or kg s-1].
  integer,       optional, intent(in) :: haloshift !< The width of halos to check (default 0).
  logical,       optional, intent(in) :: symmetric !< If true, do checksums on the fully symmetric
                                                   !! computationoal domain.
 
  integer :: is, ie, js, je, nz, hs
  logical :: sym
  is = g%isc ; ie = g%iec ; js = g%jsc ; je = g%jec ; nz = g%ke
 
  ! Note that for the chksum calls to be useful for reproducing across PE
  ! counts, there must be no redundant points, so all variables use is..ie
  ! and js...je as their extent.
  hs=1; if (present(haloshift)) hs=haloshift
  sym=.false.; if (present(symmetric)) sym=symmetric
  call uvchksum(mesg//" [uv]", u, v, g%HI, haloshift=hs, symmetric=sym)
  call hchksum(h, mesg//" h", g%HI, haloshift=hs, scale=gv%H_to_m)
  call uvchksum(mesg//" [uv]h", uh, vh, g%HI, haloshift=hs, &
                symmetric=sym, scale=gv%H_to_m)

mom_state_stats()

subroutine, public mom_checksum_packages::mom_state_stats	(	character(len=*), intent(in)	mesg,
		real, dimension( g %isdb: g %iedb, g %jsd: g %jed, g %ke), intent(in)	u,
		real, dimension( g %isd: g %ied, g %jsdb: g %jedb, g %ke), intent(in)	v,
		real, dimension( g %isd: g %ied, g %jsd: g %jed, g %ke), intent(in)	h,
		real, dimension(:,:,:), intent(in), pointer	Temp,
		real, dimension(:,:,:), intent(in), pointer	Salt,
		type(ocean_grid_type), intent(in)	G,
		logical, intent(in), optional	allowChange,
		logical, intent(in), optional	permitDiminishing
	)

Monitor and write out statistics for the model's state variables.

Parameters

[in]	g	The ocean's grid structure.
[in]	mesg	A message that appears on the chksum lines.
[in]	u	The zonal velocity [m s-1].
[in]	v	The meridional velocity [m s-1].
[in]	h	Layer thicknesses [H ~> m or kg m-2].
[in]	temp	Temperature [degC].
[in]	salt	Salinity [ppt].
[in]	allowchange	do not flag an error if the statistics change.
[in]	permitdiminishing	do not flag error if the extrema are diminishing.

Definition at line 221 of file MOM_checksum_packages.F90.

  type(ocean_grid_type),   intent(in) :: G    !< The ocean's grid structure.
  character(len=*),        intent(in) :: mesg !< A message that appears on the chksum lines.
  real, dimension(SZIB_(G),SZJ_(G),SZK_(G)), &
                           intent(in) :: u    !< The zonal velocity [m s-1].
  real, dimension(SZI_(G),SZJB_(G),SZK_(G)), &
                           intent(in) :: v    !< The meridional velocity [m s-1].
  real, dimension(SZI_(G),SZJ_(G),SZK_(G)),  &
                           intent(in) :: h    !< Layer thicknesses [H ~> m or kg m-2].
  real, pointer, dimension(:,:,:),           &
                           intent(in) :: Temp !< Temperature [degC].
  real, pointer, dimension(:,:,:),           &
                           intent(in) :: Salt !< Salinity [ppt].
  logical,       optional, intent(in) :: allowChange !< do not flag an error
                                                     !! if the statistics change.
  logical,       optional, intent(in) :: permitDiminishing !< do not flag error
                                                           !!if the extrema are diminishing.
  ! Local variables
  integer :: is, ie, js, je, nz, i, j, k
  real :: Vol, dV, Area, h_minimum
  type(stats) :: T, S, delT, delS
  type(stats), save :: oldT, oldS     ! NOTE: save data is not normally allowed but
  logical, save :: firstCall = .true. ! we use it for debugging purposes here on the
  logical :: do_TS
  real, save :: oldVol                ! assumption we will not turn this on with threads
  character(len=80) :: lMsg
  is = g%isc ; ie = g%iec ; js = g%jsc ; je = g%jec ; nz = g%ke
 
  do_ts = associated(temp) .and. associated(salt)
 
  ! First collect local stats
  area = 0. ; vol = 0.
  do j = js, je ; do i = is, ie
    area = area + g%areaT(i,j)
  enddo ; enddo
  t%minimum = 1.e34 ; t%maximum = -1.e34 ; t%average = 0.
  s%minimum = 1.e34 ; s%maximum = -1.e34 ; s%average = 0.
  h_minimum = 1.e34
  do k = 1, nz ; do j = js, je ; do i = is, ie
    if (g%mask2dT(i,j)>0.) then
      dv = g%areaT(i,j)*h(i,j,k) ; vol = vol + dv
      if (do_ts .and. h(i,j,k)>0.) then
        t%minimum = min( t%minimum, temp(i,j,k) ) ; t%maximum = max( t%maximum, temp(i,j,k) )
        t%average = t%average + dv*temp(i,j,k)
        s%minimum = min( s%minimum, salt(i,j,k) ) ; s%maximum = max( s%maximum, salt(i,j,k) )
        s%average = s%average + dv*salt(i,j,k)
      endif
      if (h_minimum > h(i,j,k)) h_minimum = h(i,j,k)
    endif
  enddo ; enddo ; enddo
  call sum_across_pes( area ) ; call sum_across_pes( vol )
  if (do_ts) then
    call min_across_pes( t%minimum ) ; call max_across_pes( t%maximum ) ; call sum_across_pes( t%average )
    call min_across_pes( s%minimum ) ; call max_across_pes( s%maximum ) ; call sum_across_pes( s%average )
    t%average = t%average / vol ; s%average = s%average / vol
  endif
  if (is_root_pe()) then
    if (.not.firstcall) then
      dv = vol - oldvol
      delt%minimum = t%minimum - oldt%minimum ; delt%maximum = t%maximum - oldt%maximum
      delt%average = t%average - oldt%average
      dels%minimum = s%minimum - olds%minimum ; dels%maximum = s%maximum - olds%maximum
      dels%average = s%average - olds%average
      write(lmsg(1:80),'(2(a,es12.4))') 'Mean thickness =',vol/area,' frac. delta=',dv/vol
      call mom_mesg(lmsg//trim(mesg))
      if (do_ts) then
        write(lmsg(1:80),'(a,3es12.4)') 'Temp min/mean/max =',t%minimum,t%average,t%maximum
        call mom_mesg(lmsg//trim(mesg))
        write(lmsg(1:80),'(a,3es12.4)') 'delT min/mean/max =',delt%minimum,delt%average,delt%maximum
        call mom_mesg(lmsg//trim(mesg))
        write(lmsg(1:80),'(a,3es12.4)') 'Salt min/mean/max =',s%minimum,s%average,s%maximum
        call mom_mesg(lmsg//trim(mesg))
        write(lmsg(1:80),'(a,3es12.4)') 'delS min/mean/max =',dels%minimum,dels%average,dels%maximum
        call mom_mesg(lmsg//trim(mesg))
      endif
    else
      write(lmsg(1:80),'(a,es12.4)') 'Mean thickness =',vol/area
      call mom_mesg(lmsg//trim(mesg))
      if (do_ts) then
        write(lmsg(1:80),'(a,3es12.4)') 'Temp min/mean/max =',t%minimum,t%average,t%maximum
        call mom_mesg(lmsg//trim(mesg))
        write(lmsg(1:80),'(a,3es12.4)') 'Salt min/mean/max =',s%minimum,s%average,s%maximum
        call mom_mesg(lmsg//trim(mesg))
      endif
    endif
  endif
  firstcall = .false. ; oldvol = vol
  oldt%minimum = t%minimum ; oldt%maximum = t%maximum ; oldt%average = t%average
  olds%minimum = s%minimum ; olds%maximum = s%maximum ; olds%average = s%average
 
  if (do_ts .and. t%minimum<-5.0) then
    do j = js, je ; do i = is, ie
      if (minval(temp(i,j,:)) == t%minimum) then
        write(0,'(a,2f12.5)') 'x,y=',g%geoLonT(i,j),g%geoLatT(i,j)
        write(0,'(a3,3a12)') 'k','h','Temp','Salt'
        do k = 1, nz
          write(0,'(i3,3es12.4)') k,h(i,j,k),temp(i,j,k),salt(i,j,k)
        enddo
        stop 'Extremum detected'
      endif
    enddo ; enddo
  endif
 
  if (h_minimum<0.0) then
    do j = js, je ; do i = is, ie
      if (minval(h(i,j,:)) == h_minimum) then
        write(0,'(a,2f12.5)') 'x,y=',g%geoLonT(i,j),g%geoLatT(i,j)
        write(0,'(a3,3a12)') 'k','h','Temp','Salt'
        do k = 1, nz
          write(0,'(i3,3es12.4)') k,h(i,j,k),temp(i,j,k),salt(i,j,k)
        enddo
        stop 'Negative thickness detected'
      endif
    enddo ; enddo
  endif
 

mom_surface_chksum()

subroutine, public mom_checksum_packages::mom_surface_chksum	(	character(len=*), intent(in)	mesg,
		type(surface), intent(inout)	sfc,
		type(ocean_grid_type), intent(in)	G,
		integer, intent(in), optional	haloshift,
		logical, intent(in), optional	symmetric
	)

Write out chksums for the ocean surface variables.

Parameters

[in]	mesg	A message that appears on the chksum lines.
[in,out]	sfc	transparent ocean surface state structure shared with the calling routine data in this structure is intent out.
[in]	g	The ocean's grid structure.
[in]	haloshift	The width of halos to check (default 0).
[in]	symmetric	If true, do checksums on the fully symmetric computationoal domain.

Definition at line 133 of file MOM_checksum_packages.F90.

  character(len=*),      intent(in) :: mesg !< A message that appears on the chksum lines.
  type(surface),         intent(inout) :: sfc !< transparent ocean surface state
                                              !! structure shared with the calling routine
                                              !! data in this structure is intent out.
  type(ocean_grid_type), intent(in) :: G    !< The ocean's grid structure.
  integer,     optional, intent(in) :: haloshift !< The width of halos to check (default 0).
  logical,     optional, intent(in) :: symmetric !< If true, do checksums on the fully symmetric
                                                 !! computationoal domain.
 
  integer :: hs
  logical :: sym
 
  sym = .false. ; if (present(symmetric)) sym = symmetric
  hs = 1 ; if (present(haloshift)) hs = haloshift
 
  if (allocated(sfc%SST)) call hchksum(sfc%SST, mesg//" SST",g%HI,haloshift=hs)
  if (allocated(sfc%SSS)) call hchksum(sfc%SSS, mesg//" SSS",g%HI,haloshift=hs)
  if (allocated(sfc%sea_lev)) call hchksum(sfc%sea_lev, mesg//" sea_lev",g%HI,haloshift=hs)
  if (allocated(sfc%Hml)) call hchksum(sfc%Hml, mesg//" Hml",g%HI,haloshift=hs)
  if (allocated(sfc%u) .and. allocated(sfc%v)) &
    call uvchksum(mesg//" SSU", sfc%u, sfc%v, g%HI, haloshift=hs, symmetric=sym)
!  if (allocated(sfc%salt_deficit)) call hchksum(sfc%salt_deficit, mesg//" salt deficit",G%HI,haloshift=hs)
  if (associated(sfc%frazil)) call hchksum(sfc%frazil, mesg//" frazil",g%HI,haloshift=hs)
 

mom_thermo_chksum()

subroutine, public mom_checksum_packages::mom_thermo_chksum	(	character(len=*), intent(in)	mesg,
		type(thermo_var_ptrs), intent(in)	tv,
		type(ocean_grid_type), intent(in)	G,
		integer, intent(in), optional	haloshift
	)

Write out chksums for the model's thermodynamic state variables.

Parameters

[in]	mesg	A message that appears on the chksum lines.
[in]	tv	A structure pointing to various thermodynamic variables.
[in]	g	The ocean's grid structure.
[in]	haloshift	The width of halos to check (default 0).

Definition at line 112 of file MOM_checksum_packages.F90.

  character(len=*),         intent(in) :: mesg !< A message that appears on the chksum lines.
  type(thermo_var_ptrs),    intent(in) :: tv   !< A structure pointing to various
                                               !! thermodynamic variables.
  type(ocean_grid_type),    intent(in) :: G    !< The ocean's grid structure.
  integer,        optional, intent(in) :: haloshift !< The width of halos to check (default 0).
 
  integer :: is, ie, js, je, nz, hs
  is = g%isc ; ie = g%iec ; js = g%jsc ; je = g%jec ; nz = g%ke
  hs=1; if (present(haloshift)) hs=haloshift
 
  if (associated(tv%T)) call hchksum(tv%T, mesg//" T",g%HI,haloshift=hs)
  if (associated(tv%S)) call hchksum(tv%S, mesg//" S",g%HI,haloshift=hs)
  if (associated(tv%frazil)) call hchksum(tv%frazil, mesg//" frazil",g%HI,haloshift=hs)
  if (associated(tv%salt_deficit)) call hchksum(tv%salt_deficit, mesg//" salt deficit",g%HI,haloshift=hs)