subroutine setembm (is, ie, js, je)

#if defined O_embm
!=======================================================================
!     initialize the energy-moisture balance model
!=======================================================================

      implicit none

      character(120) :: fname, vname, new_file_name, text
      character(3) :: a3

      integer i, ie, ii, iou, is, j, je, jj, js, jz, k, m, n, nsolve
      integer nu, nsum, ib(10), ic(10)

      logical exists, inqvardef

      real dlam, dphi, dtatms, dte, dyz, eccice, grarea, saltmax
      real si, ssh, t1, tair, yz_max, yz_min, wz, calday, tmp
      real zrel, c100, c1e4, C2K

      include "size.h"
      include "param.h"
      include "pconst.h"
      include "stdunits.h"
      include "calendar.h"
      include "solve.h"
      include "switch.h"
      include "coord.h"
      include "grdvar.h"
      include "cembm.h"
      include "atm.h"
      include "insolation.h"
# if defined O_ice
#  if defined O_ice_cpts
      include "cpts.h"
      include "thermo.h"
#  endif
      include "ice.h"
#  if defined O_ice_evp
      include "evp.h"
#  endif
# endif
      include "riv.h"
      include "tmngr.h"
      include "levind.h"
      include "csbc.h"
      include "scalar.h"
      include "veg.h"
      real rveg(imt,jmt)
# if defined O_embm_annual
      real cosz(imt,jmt)
# endif
# if defined O_ice_cpts && defined O_ice
      logical rowflg(ncat) ! flag for computing ridg. matrix row
      real Hi(ncat)        ! ice thickness (m)
      real Hmean(ncat)     ! a dummy variable at setup (m)
# endif
      real dmsk(imt,jmt), tmpij(imtm2,jmtm2)

      c100      = 100.
      c1e4      = 1.e4
      C2K       = 273.15

      cdatm     = 1.e-3
      cpatm     = 1.004e7
      sht       = 8.4e5
      shq       = 1.8e5
      shc       = 8.049e5
      rhoatm    = 1.250e-3
      esatm     = 4.6e-05
      pcfactor  = 0.
      cssh      = 3.8011e-3
      cfc11ccnn = 0.
      cfc11ccns = 0.
      cfc12ccnn = 0.
      cfc12ccns = 0.
      dc14ccnn  = 0.
      dc14ccne  = 0.
      dc14ccns  = 0.

      rhoocn    = 1.035
      esocn     = 5.4e-5
      vlocn     = 2.501e10

      cdice     = 5.5e-3
      rhoice    = 0.913
      rhosno    = 0.330
      esice     = 5.347e-5
      slice     = 2.835e10
      flice     = 3.34e9
      condice   = 2.1656e5

      soilmax   = 15.
      eslnd     = 5.347e-5

      nivc      = 1
      dtatms    = 1800.
      ns        = 30

      dalt_v    = 3.3e-3
      dalt_o    = 1.4e-3
      dalt_i    = 1.4e-3

!     ensure pass is between zero and one.
      pass =  min(max((1. - scatter), 0.), 1.)

!     gtoppm is used in converting g carbon cm-2 => ppmv CO2
!     4.138e-7 => 12e-6 g/umol carbon / 29 g/mol air
      gtoppm = 1./(4.138e-7*rhoatm*shc)
# if defined O_carbon_14_coupled

!     calculate c14ccn from dc14ccn and co2ccn
      c14ccn = (1 + dc14ccn*0.001)*rstd*co2ccn
# endif

!     calculate atmospheric surface area
      atmsa = 0.
      do j=2,jmtm1
        do i=2,imtm1
          atmsa = atmsa + dxt(i)*dyt(j)*cst(j)
        enddo
      enddo

!     sort out forcing years
      if (pyear  .gt. 1.e20) pyear = 1850.
      if (co2_yr .gt. 1.e20) co2_yr = pyear
      if (c14_yr .gt. 1.e20) c14_yr = pyear
      if (orbit_yr .gt. 1.e20) orbit_yr = pyear
      if (crops_yr .gt. 1.e20) crops_yr = pyear
      if (ice_yr .gt. 1.e20) ice_yr = pyear
      if (solar_yr .gt. 1.e20) solar_yr = pyear
      if (sealev_yr .gt. 1.e20) sealev_yr = pyear

# if defined O_embm_explicit
      if (dtatms .ne. 0.) ns = nint(dtatm/dtatms)

# endif
# if defined O_time_averages
      if (mod(timavgint, segtim) .gt. 1.e-6 .and. timavgint .gt. 0.)
     &  then
        t1 = nint(timavgint/segtim)*segtim
        if (t1 .lt. segtim) t1 = segtim
        write (stdout,'(/,(1x,a))')
     &    '==> Warning: "timavgint" does not contain an integral number'
     &,   '              of coupling time steps "segtim".              '
        write (stdout,*) '              (changed "timavgint" from '
     &, timavgint,' days to ', t1,' days to insure this condition)'
        timavgint = t1
      endif
      if (timavgint .eq. 0.) then
        write (stdout,'(/,(1x,a))')
     &    '==> Warning: averaging interval "timavgint" = 0. implies no '
     &,   '             averaging when "time_averages" is enabled      '
      endif
      if (timavgint .gt. timavgper) then
        write (stdout,'(/,(1x,a))')
     &    '==> Warning: the interval "timavgint" exceeds the averaging '
     &,   '             period "timavgper" for option "time_averages"  '
      endif
      if (timavgint .lt. timavgper) then
        write (stdout,'(/,(1x,a))')
     &    '==> Warning: averaging period "timavgper" exceeds interval  '
     &,   '             "timavgint". Setting timavgper = timavgint     '
        timavgper = timavgint
      endif
      if (timavgper .eq. 0.) then
        write (stdout,'(/,(1x,a))')
     &    '==> Warning: the averaging period "timavgper" is zero. The  '
     &,   '             average will be over only one time step!       '
      endif
      write (stdout,'(/,1x,a,f10.2,a,/,1x,a,f10.2,a)')
     &  '==> Time averages will be written every ', timavgint, ' days, '
     &, '    with an averaging period of         ', timavgper, ' days. '

# endif
# if  defined O_co2emit_data || defined O_co2emit_data_transient
!-----------------------------------------------------------------------
!     read CO2 emissions from data
!-----------------------------------------------------------------------
#  if defined O_co2emit_data_transient
      co2_yr = year0 + accel_yr0 + (relyr - accel_yr0)*accel
#  endif
      call co2emitdata
#  if defined O_carbon_co2_2d

!-----------------------------------------------------------------------
!     set co2 emissions distribution
!-----------------------------------------------------------------------
      call co2distdata
#  endif
# endif
# if  defined O_co2ccn_data || defined O_co2ccn_data_transient
!-----------------------------------------------------------------------
!     read CO2 concentration from data
!-----------------------------------------------------------------------
#  if defined O_co2ccn_data_transient
      co2_yr = year0 + accel_yr0 + (relyr - accel_yr0)*accel
#  endif
      call co2ccndata
# endif
# if !defined O_carbon_co2_2d

!-----------------------------------------------------------------------
!     calculate the relative CO2 forcing term
!-----------------------------------------------------------------------

      call co2forc

      write (stdout,*)
      write (stdout,*) 'CO2 ratio (reference = 280 ppmv) =',co2ccn/280.
      write (stdout,*) 'Yields radiative forcing (W/m2) = ',anthro*1.e-3

# endif
!-----------------------------------------------------------------------
!     calculate the expansion coefficients for Berger's solution for
!     the year of the initial conditions
!-----------------------------------------------------------------------

# if defined O_orbit_transient
      orbit_yr = year0 + accel_yr0 + (relyr - accel_yr0)*accel
# endif
      call orbit (orbit_yr, eccen, obliq, mvelp, lambm0)
      write (stdout,*)
      write (stdout,*) 'Initial Orbital Parameters:'
# if !defined O_orbit_user
      write (stdout,*) '  Orbital Year:', orbit_yr
# endif
      write (stdout,*) '  Eccentricity:', eccen
      write (stdout,*) '  Obliquity:   ', obliq
      write (stdout,*) '  Longitude of Perihelion:', mvelp+180.

!-----------------------------------------------------------------------
!     calculate annual average insolation and Coriolis factor
!-----------------------------------------------------------------------

      radian = 360./(2.*pi)
      do j=1,jmt
# if defined O_embm_explicit
        filter(j) = 1. - sin(yt(j)/radian)**ns
# endif
        do i=1,imt
!         calculate coriolis parameter
          fcor(i,j) = 2.*omega*sin(ulat(i,j)/radian)
        enddo
      enddo

# if defined O_embm_annual
      solins(:,:) = 0.
      i = imt*jmt
      do n=1,365
!       subroutine decl is expecting a 365.25 day year
        calday = n*365.25/365.
        call decl (calday, eccen, obliq, mvelp, lambm0, sindec, eccf)
        call zenith (i, c0, daylen, daylen, tlat, tlon, sindec, cosz)
        solins(:,:) = solins(:,:) + solarconst*eccf*cosz(:,:)
      enddo
      solins(:,:) = solins(:,:)/365.
# endif

!-----------------------------------------------------------------------
!     read diffusion
!-----------------------------------------------------------------------

      dn(:,:,:) = 5.e9
      de(:,:,:) = 5.e9
      fname = new_file_name ("A_diff.nc")
      inquire (file=trim(fname), exist=exists)
      if (.not. exists) then
        print*, "Warning => ", trim(fname), " does not exist."
      else
        call openfile (fname, iou)
        ib(:) = 1
        ic(:) = 1
        ic(1) = imtm2
        ic(2) = jmtm2
        do n=1,nat
          if (n .lt. 1000) write(a3,'(i3)') n
          if (n .lt. 100) write(a3,'(i2)') n
          if (n .lt. 10) write(a3,'(i1)') n
!         northward component
          vname = 'dn_'//trim(a3)
          if (trim(mapat(n)) .eq. 'sat') then
            vname = 'A_difftY'
          elseif (trim(mapat(n)) .eq. 'shum') then
            vname = 'A_diffqY'
          elseif (trim(mapat(n)) .eq. 'co2') then
            vname = 'A_diffcY'
          endif
          exists = inqvardef(trim(vname), iou)
          if (exists) then
            call getvara (trim(vname), iou, imtm2*jmtm2, ib, ic
     &,       tmpij, c1e4, c0)
            dn(2:imtm1,2:jmtm1,n) = tmpij(1:imtm2,1:jmtm2)
            call embmbc (dn(:,:,n))
          endif
!         eastward component
          vname = 'de_'//trim(a3)
          if (trim(mapat(n)) .eq. 'sat') then
            vname = 'A_difftX'
          elseif (trim(mapat(n)) .eq. 'shum') then
            vname = 'A_diffqX'
          elseif (trim(mapat(n)) .eq. 'co2') then
            vname = 'A_diffcX'
          endif
          exists = inqvardef(trim(vname), iou)
          if (exists) then
            call getvara (trim(vname), iou, imtm2*jmtm2, ib, ic
     &,       tmpij, c1e4, c0)
            de(2:imtm1,2:jmtm1,n) = tmpij(1:imtm2,1:jmtm2)
            call embmbc (de(:,:,n))
          endif
        enddo
      endif

!-----------------------------------------------------------------------
!     set solver parameters
!-----------------------------------------------------------------------

      nsolve = 0
# if !defined O_embm_explicit
      itin(:)  = 500        ! max solver iterations
#  if defined O_global_sums
#   if defined O_embm_slap
      epsin(:) = 5.e-13
#   else
      epsin(:) = 5.e-11
#   endif
#  else
      epsin(:) = 5.e-7
      epsin(ishum) = 1.e-5
      epsin(isat) = 1.e-3
#  endif
#  if defined O_embm_essl
      nsolve = nsolve + 1
      iparm(2)= 2               ! solver method
      iparm(3)= 7               ! if iparm(2)=3 then iparm(3)=k,5<k<10
      iparm(4)= 4               ! preconditioning
      iparm(5)= 2               ! stopping criterion
      call einfo(0)
      call errset(2110,256,-1,0,1,2110)
#  endif
#  if defined O_embm_sparskit
      nsolve = nsolve + 1
      ipar(1) = 0               ! always 0 to start an iterative solver
      ipar(2) = 2               ! right preconditioning
      ipar(3) = 1               ! use convergence test scheme 1
      ipar(4) = nwork           ! the 'w' has nwork elements
      ipar(5) = 10              ! use *GMRES(10) (e.g. FGMRES(10))
      ipar(6) = 100             ! use at most 100 matvec's
      fpar(1) = 1.0E-6          ! relative tolerance 1.0E-6
      fpar(2) = 1.0E-10         ! absolute tolerance 1.0E-10
      fpar(11) = 0.0            ! clearing the FLOPS counter
#  endif
#  if defined O_embm_slap
      nsolve = nsolve + 1
#  endif
#  if defined O_embm_mgrid
      nsolve = nsolve + 1
      levelin = 20              ! max coarse grid level
#  endif
#  if defined O_embm_adi
      nsolve = nsolve + 1
      itin(1:nat) = 1
      itout(1:nat) = 1
#  endif
# else
      nsolve = nsolve + 1
# endif
      if (nsolve .ne. 1) then
        write(*,*) '==> Error: more or less than one solver defined.'
        write(*,*) '           Use only one of embm_adi, embm_mgrid,'
     &,   ' embm_slap, embm_essl, embm_sparskit or embm_explicit'
        stop '=>setembm'
      endif

# if defined O_ice
!-----------------------------------------------------------------------
!     check latent heats will sum to zero
!-----------------------------------------------------------------------

      if (slice .ne. vlocn + flice) write (stdout,'(/,a)')
     &   '==> Warning: changing latent heat of fusion to conserve heat'
        flice = slice - vlocn

# else

          write (stdout,*) '==> Warning: ice model is not defined.'
     &,     ' heat flux may be limited to prevent freezing sst.'

# endif
# if defined O_embm_solve2x || defined O_embm_solve2y
!-----------------------------------------------------------------------
!     calculate grid ratio for the coarse grid atmospheric solver
!-----------------------------------------------------------------------

#  if defined O_embm_solve2y
      do jj=1,jjmtm2
        j = jj*2
#  else
      do j=2,jmtm1
#  endif
#  if defined O_embm_solve2x
        do ii=1,iimtm2
          i = ii*2
#  else
        do i=2,imtm1
#  endif
          grarea = dxt(i)*dyt(j)*cst(j)
#  if defined O_embm_solve2x
          grarea = grarea + dxt(i+1)*dyt(j)*cst(j)
#  endif
#  if defined O_embm_solve2y
          grarea = grarea + dxt(i)*dyt(j+1)*cst(j+1)
#  endif
#  if defined O_embm_solve2x && defined O_embm_solve2y
          grarea = grarea + dxt(i+1)*dyt(j+1)*cst(j+1)
#  endif
          gr(i,j) = dxt(i)*dyt(j)*cst(j)/grarea
#  if defined O_embm_solve2x
          gr(i+1,j) = dxt(i+1)*dyt(j)*cst(j)/grarea
#  endif
#  if defined O_embm_solve2y
          gr(i,j+1) = dxt(i)*dyt(j+1)*cst(j+1)/grarea
#  endif
#  if defined O_embm_solve2x && defined O_embm_solve2y
          gr(i+1,j+1) = dxt(i+1)*dyt(j+1)*cst(j+1)/grarea
#  endif
        enddo
      enddo

# endif
!-----------------------------------------------------------------------
!     calculate grid terms for the atmospheric solver
!-----------------------------------------------------------------------

# if defined O_embm_solve2y
      do jj=2,jjmtm2
        j = jj*2
        wtj(j) = 0.5*dyt(j)/(dyt(j-1)+dyt(j)+dyt(j+1)+dyt(j+2))
        wtj(j-1) = 0.5*dyt(j+1)/(dyt(j-1)+dyt(j)+dyt(j+1)+dyt(j+2))
        ygrd(j) = dyt(j)*cst(j)/(cst(j)*dyt(j)+cst(j+1)*dyt(j+1))
        ygrd(j+1) = dyt(j+1)*cst(j+1)/(cst(j+1)*dyt(j+1)+cst(j)*dyt(j))
      enddo

      do j=2,jmtm2
        dsgrd(j) = csu(j-1)/((dyt(j)+dyt(j-1))*csu(j)*
     &             (dyu(j)+dyu(j+1)))
        dngrd(j) = csu(j+1)/((dyt(j+2)+dyt(j+1))*csu(j)*
     &             (dyu(j)+dyu(j+1)))
        asgrd(j) = csu(j-1)/(2.*csu(j)*(dyu(j)+dyu(j+1)))
        angrd(j) = csu(j+1)/(2.*csu(j)*(dyu(j)+dyu(j+1)))
# else
      do j=2,jmtm1
        dsgrd(j) = csu(j-1)/(dyu(j-1)*cst(j)*dyt(j))
        dngrd(j) = csu(j)/(dyu(j)*cst(j)*dyt(j))
        asgrd(j) = csu(j-1)/(2.*cst(j)*dyt(j))
        angrd(j) = csu(j)/(2.*cst(j)*dyt(j))
# endif
      enddo
# if defined O_embm_solve2x

      do ii=1,iimtm2
        i = ii*2
        wti(i) = 0.5*dxt(i)/(dxt(i-1)+dxt(i)+dxt(i+1)+dxt(i+2))
        wti(i+1) = 0.5*dxt(i+1)/(dxt(i-1)+dxt(i)+dxt(i+1)+dxt(i+2))
        xgrd(i) = dxt(i)/(dxt(i) + dxt(i+1))
        xgrd(i+1) = dxt(i+1)/(dxt(i) + dxt(i+1))
      enddo

      do i=2,imtm2
        dwgrd(i) = 1./((dxt(i) + dxt(i-1))*(dxu(i) + dxu(i+1)))
        degrd(i) = 1./((dxt(i+2) + dxt(i+1))*(dxu(i) + dxu(i+1)))
        azgrd(i) = 1./(2.*(dxu(i) + dxu(i+1)))
# else
      do i=2,imtm1
        dwgrd(i) = 1./(dxu(i-1)*dxt(i))
        degrd(i) = 1./(dxu(i)*dxt(i))
        azgrd(i) = 1./(2.*dxt(i))
# endif
      enddo

# if defined O_ice_cpts && defined O_ice
#  if !defined O_ice_cpts5 && !defined O_ice_cpts10 && defined O_roth_press
      write(*,*) 'you are strongly discouraged from using roth_press'
      stop ' with fewer than 5 ice categories'
#  endif
!-----------------------------------------------------------------------
!     setup the vectors identifying first and last layer in each bin
!-----------------------------------------------------------------------

      nilay(1) = 4
#  if defined O_ice_cpts3
      nilay(1) = 2
      nilay(2) = 4
      nilay(3) = 8

      hstar(1) = 50.
      hstar(2) = 250.
#  elif defined O_ice_cpts5
      nilay(1) = 2
      nilay(2) = 4
      nilay(3) = 4
      nilay(4) = 8
      nilay(5) = 8

      hstar(1) = 40.
      hstar(2) = 90.
      hstar(3) = 200.
      hstar(4) = 350.
#  elif defined O_ice_cpts10
      nilay(1) = 2
      nilay(2) = 2
      do n=3,5
        nilay(n) = 4
      enddo
      do n=6,ncat
        nilay(n) = 8
      enddo

      hstar(1) = 25.
      hstar(2) = 50.
      hstar(3) = 75.
      hstar(4) = 100.
      hstar(5) = 140.
      hstar(6) = 190.
      hstar(7) = 330.
      hstar(8) = 500.
      hstar(9) = 700.
#  endif

      hstar(0) = 10.
      hstar(ncat) = 200000. !should not be used, make it real big anyway

      nsum = 0.
      do n=1,ncat
        nsum = nsum + nilay(n)
      enddo
      if (nsum .ne. ntilay) stop 'the sum of nilay must be ntilay'

      print*, 'cpts ice model set up with ncat=',ncat,
     &  ' ice categories and 1 open water category'
      print*, '   category intervals are: ',(hstar(n), n=0, ncat)
      print*, '   layers per category are:',(nilay(n), n=1, ncat)

!     minimum allowable fract
      asmall(0) = a0small
      do n=1,ncat
        asmall(n) = aismall
      enddo

!     matrix used to assist in heat transf. from cat i to j
      do n=1,ncat                     ! if nilay = { 2,4,8 }
        do m=1,n
          ncrel(n,m) = 1              !    ncrel = | 1 2 4 |
        enddo                         !            | 1 1 2 |
        do m=n,ncat                   !            | 1 1 1 |
          ncrel(n,m) = nilay(m)/nilay(n)
        enddo
      enddo
!     vectors identifying first and last layer in each bin
      layer1(1) = 1                   ! if nilay = { 2,4,8 }
      layern(1) = nilay(1)            !   layer1 = { 1,3,7 }
      do n=2,ncat                     !   layern = { 2,6,16}
        layer1(n) = layern(n-1) + 1
        layern(n) = layern(n-1) + nilay(n)
      enddo

!     default ridg matrices,  comp. all rows (rowflg=true)
!     assume ice thickness is mean of range for n < ncat
!     and 1m thicker than lower limit for ncat
      do n=1,ncat
        do k=1,ncat
          M_def(n,k) = 0.
          N_def(n,k) = 0.
          HN_def(n,k) = 0.
        enddo
        rowflg(n) = .true.
        if (n .lt. ncat) then
          Hi(n) = 0.5*(hstar(n-1) + hstar(n))
        else
           Hi(ncat) = hstar(ncat-1) + 1.*centi
        endif
      enddo
      call comp_matrices (rowflg, Hi, Hmean, M_def, N_def, HN_def)

!     setup the salinity profile and the melting temperature
!     for each layer
      salnew = 5.
!      saltmax = 3.2
      saltmax = 5.

      do n=1,ncat
        do k=1,nilay(n)
          zrel = (k-0.5)/nilay(n)
          saltz(k,n) = saltmax*0.5*(1.+sin(3.14159*(
     &                     zrel**(0.40706205/(zrel+0.57265966))-0.5)))
        enddo
        saltz(nilay(n)+1,n) = saltmax
        do k=1,nilay(n)
          tmelz(k,n) = -saltz(k,n)*alpha
        enddo
        print*, 'Category ',n
        write(*,'(A17,10(1x,f8.3))')
     &    '   salt profile:',(saltz(k,n),k=1,nilay(n)+1)
        write(*,'(A17,10(1x,f8.3))')
     &    '   melt temp:   ',(tmelz(k,n),k=1,nilay(n))
      enddo

! it would be nice to do this in a parameter statement
! because these are not variable
      rflice = flice*rhoice    ! specific latent heat of fusion ice
      rflsno = flice*rhosno    ! specific latent heat of fusion snow
      rslice = slice*rhoice    ! specific latent heat of sublim ice
      rslsno = slice*rhosno    ! specific latent heat of sublim snow

      rvlice = vlocn*rhoice    ! specific latent heat of vapour*rhoice
      rvlsno = vlocn*rhosno    ! specific latent heat of vapour*rhosno
      rcpice = cpice*rhoice    ! specific heat capacity of fresh ice
      rcpsno = cpsno*rhosno    ! specific heat capacity of snow

      rcpatm = rhoatm*cpatm
      rvlatm = rhoatm*vlocn
      rslatm = rhoatm*slice

      gamma  = rflice*ALPHA    ! heat capacity C=Cpi+gamma*salinity/T**2

# endif
!-----------------------------------------------------------------------
!     set initial conditions or read a restart
!-----------------------------------------------------------------------

      newcoef(:,:) = .true.

      nats = namix
      dayoyr = 1.
      itt = 0
      irstdy = 0
      msrsdy = 0
# if defined O_embm_running_average || defined O_embm_awind
      totaltime = 0.
      atbar(:,:) = 0.
      rtbar(:,:) = 0.
# endif
      at(:,:,:,:) = 0.
      tair = 13.
      at(:,:,:,isat) = tair
      ssh = cssh*exp(17.67*tair/(tair + 243.5))
      rh(:,:) = rhmax
      at(:,:,:,ishum) = rhmax*ssh
# if defined O_carbon && defined O_carbon_co2_2d
      at(:,:,:,ico2) = co2ccn
# endif
# if defined O_co2emit_track_co2
      track_co2(:) = 2.e20
      ntrack_co2 = yrlen/segtim
      itrack_co2 = 0
# endif
# if defined O_co2emit_track_sat || defined O_embm_vcs
      track_sat(:) = 2.e20
      ntrack_sat = yrlen/segtim
      itrack_sat = 0
# endif
      precip(:,:) = 0.
# if !defined O_mom
      sbc(:,:,isst) = 0.
      sbc(:,:,isss) = 0.
# endif
# if defined O_landice_data
      aicel(:,:,:) = 0.
      hicel(:,:,:) = 0.
# endif
# if defined O_embm_awind
      awx(:,:) = 0.
      awy(:,:) = 0.
# endif
      soilm(:,:,:) = 0.
      surf(:,:) = 0.
# if defined O_ice
      hice(:,:,:) = 0.
      aice(:,:,:) = 0.
      tice(:,:) = 0.
      hsno(:,:,:) = 0.
# endif
# if defined O_ice_cpts && defined O_ice
      hseff(:,:,:,:) = 0.
      A(:,:,:,:) = 0.
      heff(:,:,:,:) = 0.
      ts(:,:,:,:) = 0.
      E(:,:,:,:) = 0.
# endif
# if defined O_ice_cpts_roth_press && defined O_ice_cpts && defined O_ice
        strength(:,:,:) = 0
# endif
# if defined O_ice_evp && defined O_ice
      uice(:,:) = 0.
      vice(:,:) = 0.
      sbc(:,:,isu) = 0.
      sbc(:,:,isv) = 0.
      sbc(:,:,igu) = 0.
      sbc(:,:,igv) = 0.
      sig11n(:,:) = 0.
      sig11e(:,:) = 0.
      sig11s(:,:) = 0.
      sig11w(:,:) = 0.
      sig22n(:,:) = 0.
      sig22e(:,:) = 0.
      sig22s(:,:) = 0.
      sig22w(:,:) = 0.
      sig12n(:,:) = 0.
      sig12e(:,:) = 0.
      sig12s(:,:) = 0.
      sig12w(:,:) = 0.
# endif
# if defined O_sulphate_data_transient
      sulph(:,:,:) = 0.
# endif
# if !defined O_embm_explicit
      bv(:) = 0.
      xv(:) = 0.
#  if defined O_embm_slap
      raux(:) = 0.
      iaux(:) = 0
#  elif defined O_embm_essl
      aux1(:,:,:) = 0.
      aux2(:) = 0.
      rparm(1) = 0.
      iparm(1) = 0
#  elif defined O_embm_sparskit
      work(:,:,:) = 0.
#  endif
# endif
# if defined O_landice_data

!-----------------------------------------------------------------------
!     set land ice data and tracer grid ocean mask
!-----------------------------------------------------------------------

      call icedata
# else

!-----------------------------------------------------------------------
!     set tracer grid ocean mask
!-----------------------------------------------------------------------

      fname = new_file_name ("G_mskt.nc")
      inquire (file=trim(fname), exist=exists)
      if (exists) then
        call openfile (fname, iou)
        ib(:) = 1
        ic(:) = 1
        ic(1) = imtm2
        ic(2) = jmtm2
        if (exists) then
          call getvara ('G_mskt', iou, imtm2*jmtm2, ib, ic
     &,     tmpij, c1, c0)
          tmsk(2:imtm1,2:jmtm1) = tmpij(1:imtm2,1:jmtm2)
          call embmbc (tmsk)
        endif
      endif
      if (.not. exists) then
        tmsk(:,:) = 0.
        do j=1,jmtm1
          do i=1,imtm1
            if (kmt(i,j) .gt. 0.) tmsk(i,j) = 1.
          enddo
        enddo
      endif
# endif
# if defined O_sealev_data

!-----------------------------------------------------------------------
!     set sea level anomalies
!-----------------------------------------------------------------------

      call sealevdata
# endif
      dsealev = sealev

      if (.not. init) then
        fname = new_file_name ("restart_embm.nc")
        inquire (file=trim(fname), exist=exists)
        if (exists) call embm_rest_in (fname, is, ie, js, je)
# if defined O_restart_2
        fname = new_file_name ("restart_2_embm.nc")
        inquire (file=trim(fname), exist=exists)
        if (exists) call embm_rest_in (fname, is, ie, js, je)
# endif
      endif
# if !defined O_mom

!-----------------------------------------------------------------------
!     initialize the time manager with specified initial conditions
!     time, user reference time, model time, and how long to integrate.
!-----------------------------------------------------------------------

      call tmngri (year0, month0, day0, hour0, min0, sec0
     &,            ryear, rmonth, rday, rhour, rmin, rsec
     &,            irstdy, msrsdy, runlen, rununits, rundays, dtatm)
# endif
# if defined O_sealev

!-----------------------------------------------------------------------
!     set anomalous sea level
!-----------------------------------------------------------------------

!     calculate the area of exposed ocean
      ocnsa = 0.
      do j=2,jmtm1
        do i=2,imtm1
          ocnsa = ocnsa + dxt(i)*dyt(j)*cst(j)*tmsk(i,j)
        enddo
      enddo
      tmp = ocnsa/atmsa
      do j=2,jmtm1
        do i=2,imtm1
          elev_sealev(i,j) = sealev*(1. - tmp)*tmsk(i,j)
     &                     - sealev*tmp*(1. - tmsk(i,j))
        enddo
      enddo
# endif
# if defined O_embm_awind

!-----------------------------------------------------------------------
!     read average air temperature
!-----------------------------------------------------------------------

      tbar(:,:) = 0.
      fname = new_file_name ("A_slatref.nc")
      inquire (file=trim(fname), exist=exists)
      if (.not. exists) then
        print*, "Error => ", trim(fname), " does not exist."
        stop 'A_slat in setembm.f'
      endif
      ib(:) = 1
      ic(:) = 1
      ic(1) = imtm2
      ic(2) = jmtm2
      call openfile (fname, iou)
      exists = inqvardef('A_slat', iou)
      if (.not. exists) then
        print*, "Error => A_slat does not exist."
        stop 'A_slat in setembm.f'
      else
        call getvara ('A_slat', iou, imtm2*jmtm2, ib, ic, tmpij, c1, c0)
        tbar(2:imtm1,2:jmtm1) = tmpij(1:imtm2,1:jmtm2)
        text = "C"
        call getatttext (iou, 'A_slat', 'units', text)
!       convert to model units (C)
        if (trim(text) .eq. "K")
     &    where (tbar(:,:) .lt. 1.e30) tbar(:,:) = tbar(:,:) - C2K
      endif
      call embmbc (tbar)
# endif

!-----------------------------------------------------------------------
!     read land elevations
!-----------------------------------------------------------------------

      elev(:,:) = 0.
      fname = new_file_name ("L_elev.nc")
      inquire (file=trim(fname), exist=exists)
      if (.not. exists) then
        print*, "Warning => ", trim(fname), " does not exist."
      else
        ib(:) = 1
        ic(:) = 1
        ic(1) = imtm2
        ic(2) = jmtm2
        call openfile (fname, iou)
        call getvara ('L_elev', iou, imtm2*jmtm2, ib, ic, tmpij
     &,   c100, c0)
        elev(2:imtm1,2:jmtm1) = tmpij(1:imtm2,1:jmtm2)
        call embmbc (elev)
      endif
!     check for negative elevations
      where (elev(:,:) .lt. 0.) elev(:,:) = 0.

# if defined O_embm_running_average || defined O_embm_awind
!-----------------------------------------------------------------------
!     initialize running annual averages
!-----------------------------------------------------------------------

      fname = new_file_name ("restart_embm.nc")
      inquire (file=trim(fname), exist=exists)
      if (exists) then
        call openfile (fname, iou)
        exists = inqvardef('rtbar', iou)
      endif
      if (.not. exists .or. init) then
        totaltime = 0.
        atbar(:,:) = 0.
#  if defined O_embm_awind
        rtbar(:,:) = tbar(:,:)
#  else
        rtbar(:,:) = 0.
#  endif
      endif

# endif
!-----------------------------------------------------------------------
!     set velocity grid ocean mask
!-----------------------------------------------------------------------

      umsk(:,:) = 0.
      do j=2,jmtm1
        do i=2,imtm1
          umsk(i,j) = min (tmsk(i,j), tmsk(i+1,j), tmsk(i,j+1)
     &,                    tmsk(i+1,j+1))
        enddo
      enddo
      call embmbc (umsk)
!     remove isolated bays
      do j=2,jmtm1
        do i=2,imtm1
          tmsk(i,j) = max (umsk(i,j), umsk(i-1,j), umsk(i,j-1)
     &,                    umsk(i-1,j-1))
        enddo
      enddo
      call embmbc (tmsk)
      do j=2,jmtm1
        do i=2,imtm1
          umsk(i,j) = min (tmsk(i,j), tmsk(i+1,j), tmsk(i,j+1)
     &,                    tmsk(i+1,j+1))
        enddo
      enddo
      call embmbc (umsk)

#  if defined O_ice && !defined O_ice_cpts
      do j=1,jmt
        do i=1,imt
          if (tmsk(i,j) .ge. 0.5) then
            if (hice(i,j,1) .le. 0.) aice(i,j,1) = 0.
            if (hice(i,j,2) .le. 0.) aice(i,j,2) = 0.
          endif
        enddo
      enddo
      call embmbc (aice(1,1,1))
      call embmbc (aice(1,1,2))

#  endif
!-----------------------------------------------------------------------
!     set the river model
!-----------------------------------------------------------------------

      call rivinit

!-----------------------------------------------------------------------
!     set ocean coalbedo
!-----------------------------------------------------------------------

      do j=1,jmt
        do i=1,imt
          if (kmt(i,j) .gt. 0) then
!           varies from 0.895 at the equator to 0.815 at the pole
            sbc(i,j,isca) = 0.87 + 0.02*cos(abs(tlat(i,j))*2./radian)
          endif
        enddo
      enddo

!-----------------------------------------------------------------------
!     read vegetation class
!-----------------------------------------------------------------------

      rveg(:,:) = 0.
      fname = new_file_name ("L_potveg.nc")
      inquire (file=trim(fname), exist=exists)
      if (.not. exists) then
        print*, "Warning => ", trim(fname), " does not exist."
      else
        ib(:) = 1
        ic(:) = 1
        ic(1) = imtm2
        ic(2) = jmtm2
        call openfile (fname, iou)
        call getvara ('L_potveg', iou, imtm2*jmtm2, ib, ic, tmpij
     &,   c1, c0)
        rveg(2:imtm1,2:jmtm1) = tmpij(1:imtm2,1:jmtm2)
        call embmbc (rveg)
      endif
      do j=1,jmt
        do i=1,imt
          iveg(i,j) = iice
          if (rveg(i,j) .gt. 0.6 .and. rveg(i,j) .lt. 7.4)
     &      iveg(i,j) = nint(rveg(i,j))
        enddo
      enddo

      call gvsbc

# if defined O_ice_evp && defined O_ice
!----------------------------------------------------------------------
!     initialize elastic viscous plastic variables
!-----------------------------------------------------------------------

      dlam = dxu(int(imt/2))/100.
      dphi = dyu(int(jmt/2))/100.
      diff1 = 0.004
      diff1 = diff1*dlam
      diff2 = diff1*dlam**2
      eccice = 2.
      ecc2 = 1./(eccice**2)
      ecc2m = 2.*(1.-ecc2)
      ecc2p = (1.+ecc2)
      zetamin = 4.e11
      eyc = 0.25
      dte = dtatm/float(ndte)
      dtei = 1./dte
      floor = 1.e-11
      do j=2,jmtm1
        do i=2,imtm1
           xyminevp = (min(cst(j)*dxt(i),dyt(j)))**2
        enddo
      enddo

# endif
!-----------------------------------------------------------------------
!     check ice velocity calculation
!-----------------------------------------------------------------------

      if (nivts .gt. nint(segtim*daylen/dtatm)) then
        write(*,*) '==> Warning: ice velocities will be calculated'
        write(*,*) '             every coupling time.'
        nivts =  nint(segtim*daylen/dtatm)
      endif
# if defined O_embm_solve2y
!-----------------------------------------------------------------------
!     check atmosphere is even size in y
!-----------------------------------------------------------------------

      if (mod(jmtm2,2) .ne. 0) then
        write(*,*) '==> Error: atmosphere must be even sized in'
        write(*,*) '           latitude to use embm_solve2y.'
        stop '=>setembm'
      endif
# endif
# if defined O_embm_solve2x
!-----------------------------------------------------------------------
!     check atmosphere is even size in x
!-----------------------------------------------------------------------

      if (mod(imtm2,2) .ne. 0) then
        write(*,*) '==> Error: atmosphere must be even sized in'
        write(*,*) '           latitude to use embm_solve2x.'
        stop '=>setembm'
      endif
# endif
# if defined O_time_averages
!-----------------------------------------------------------------------
!     zero time average accumulators
!-----------------------------------------------------------------------

      call ta_embm_tavg (is, ie, js, je, 0)

# endif
# if defined O_time_step_monitor
!-----------------------------------------------------------------------
!     zero integrated time average accumulators
!-----------------------------------------------------------------------

      call ta_embm_tsi (is, ie, js, je, 0)
# endif
#endif

      return
      end