C $Header: /u/gcmpack/MITgcm/pkg/ctrl/ctrl_getobcsw.F,v 1.17 2014/10/09 00:49:26 gforget Exp $
C $Name:  $

#include "CTRL_OPTIONS.h"
#ifdef ALLOW_OBCS
# include "OBCS_OPTIONS.h"
#endif

      subroutine CTRL_GETOBCSW(
     I                             mytime,
     I                             myiter,
     I                             mythid
     &                           )

c     ==================================================================
c     SUBROUTINE ctrl_getobcsw
c     ==================================================================
c
c     o Get western obc of the control vector and add it
c       to dyn. fields
c
c     started: heimbach@mit.edu, 29-Aug-2001
c
c     modified: gebbie@mit.edu, 18-Mar-2003
c     ==================================================================
c     SUBROUTINE ctrl_getobcsw
c     ==================================================================

      implicit none

c     == global variables ==
#ifdef ALLOW_OBCSW_CONTROL
#include "EEPARAMS.h"
#include "SIZE.h"
#include "PARAMS.h"
#include "GRID.h"
c#include "OBCS_PARAMS.h"
#include "OBCS_GRID.h"
#include "OBCS_FIELDS.h"
#include "CTRL_SIZE.h"
#include "ctrl.h"
#include "ctrl_dummy.h"
#include "CTRL_OBCS.h"
#include "optim.h"
#endif /* ALLOW_OBCSW_CONTROL */

c     == routine arguments ==
      _RL     mytime
      integer myiter
      integer mythid

#ifdef ALLOW_OBCSW_CONTROL
c     == local variables ==

      integer bi,bj
      integer i,j,k
      integer itlo,ithi
      integer jtlo,jthi
      integer jmin,jmax
      integer imin,imax
      integer ilobcsw
      integer iobcs
      integer ip1

      _RL     dummy
      _RL     obcswfac
      logical obcswfirst
      logical obcswchanged
      integer obcswcount0
      integer obcswcount1

cgg      _RL maskyz   (1-oly:sny+oly,nr,nsx,nsy)
      _RL tmpfldyz (1-oly:sny+oly,nr,nsx,nsy)

      logical doglobalread
      logical ladinit

      character*(80) fnameobcsw

#ifdef ALLOW_OBCS_CONTROL_MODES
      integer nk,nz
      _RL     tmpz (nr,nsx,nsy)
      _RL     stmp
#endif

c     == external functions ==

      integer  ilnblnk
      external 


c     == end of interface ==

      jtlo = mybylo(mythid)
      jthi = mybyhi(mythid)
      itlo = mybxlo(mythid)
      ithi = mybxhi(mythid)
      jmin = 1-oly
      jmax = sny+oly
      imin = 1-olx
      imax = snx+olx
      ip1  = 1

c--   Now, read the control vector.
      doglobalread = .false.
      ladinit      = .false.

      if (optimcycle .ge. 0) then
       ilobcsw=ilnblnk( xx_obcsw_file )
       write(fnameobcsw(1:80),'(2a,i10.10)')
     &      xx_obcsw_file(1:ilobcsw), '.', optimcycle
      endif

c--   Get the counters, flags, and the interpolation factor.
      call CTRL_GET_GEN_REC(
     I                   xx_obcswstartdate, xx_obcswperiod,
     O                   obcswfac, obcswfirst, obcswchanged,
     O                   obcswcount0,obcswcount1,
     I                   mytime, myiter, mythid )

      do iobcs = 1,nobcs
       if ( obcswfirst ) then
        call ACTIVE_READ_YZ( fnameobcsw, tmpfldyz,
     &                       (obcswcount0-1)*nobcs+iobcs,
     &                       doglobalread, ladinit, optimcycle,
     &                       mythid, xx_obcsw_dummy )

        do bj = jtlo,jthi
         do bi = itlo,ithi
#ifdef ALLOW_OBCS_CONTROL_MODES
          if (iobcs .gt. 2) then
           do j = jmin,jmax
            i = OB_Iw(j,bi,bj)
            IF ( i.EQ.OB_indexNone ) i = 1
cih    Determine number of open vertical layers.
            nz = 0
            do k = 1,Nr
              if (iobcs .eq. 3) then
                nz = nz + maskW(i+ip1,j,k,bi,bj)
              else
                nz = nz + maskS(i,j,k,bi,bj)
              endif
            end


do cih Compute absolute velocities from the barotropic-baroclinic modes. do k = 1,Nr if (k.le.nz) then stmp = 0. do nk = 1,nz stmp = stmp + & modesv(k,nk,nz)*tmpfldyz(j,nk,bi,bj) end


do tmpz(k,bi,bj) = stmp else tmpz(k,bi,bj) = 0. end


if enddo do k = 1,Nr if (iobcs .eq. 3) then tmpfldyz(j,k,bi,bj) = tmpz(k,bi,bj) & *recip_hFacW(i+ip1,j,k,bi,bj) else tmpfldyz(j,k,bi,bj) = tmpz(k,bi,bj) & *recip_hFacS(i,j,k,bi,bj) endif end


do enddo endif #endif do k = 1,nr do j = jmin,jmax xx_obcsw1(j,k,bi,bj,iobcs) = tmpfldyz (j,k,bi,bj) cgg & * maskyz (j,k,bi,bj) enddo enddo enddo enddo endif if ( (obcswfirst) .or. (obcswchanged)) then do bj = jtlo,jthi do bi = itlo,ithi do k = 1,nr do j = jmin,jmax xx_obcsw0(j,k,bi,bj,iobcs) = xx_obcsw1(j,k,bi,bj,iobcs) tmpfldyz (j,k,bi,bj) = 0. _d 0 enddo enddo enddo enddo call ACTIVE_READ_YZ( fnameobcsw, tmpfldyz, & (obcswcount1-1)*nobcs+iobcs, & doglobalread, ladinit, optimcycle, & mythid, xx_obcsw_dummy ) do bj = jtlo,jthi do bi = itlo,ithi #ifdef ALLOW_OBCS_CONTROL_MODES if (iobcs .gt. 2) then do j = jmin,jmax i = OB_Iw(j,bi,bj) IF ( i.EQ.OB_indexNone ) i = 1 cih Determine number of open vertical layers. nz = 0 do k = 1,Nr if (iobcs .eq. 3) then nz = nz + maskW(i+ip1,j,k,bi,bj) else nz = nz + maskS(i,j,k,bi,bj) endif end


do cih Compute absolute velocities from the barotropic-baroclinic modes. do k = 1,Nr if (k.le.nz) then stmp = 0. do nk = 1,nz stmp = stmp + & modesv(k,nk,nz)*tmpfldyz(j,nk,bi,bj) end


do tmpz(k,bi,bj) = stmp else tmpz(k,bi,bj) = 0. end


if enddo do k = 1,Nr if (iobcs .eq. 3) then tmpfldyz(j,k,bi,bj) = tmpz(k,bi,bj) & *recip_hFacW(i+ip1,j,k,bi,bj) else tmpfldyz(j,k,bi,bj) = tmpz(k,bi,bj) & *recip_hFacS(i,j,k,bi,bj) endif end


do enddo endif #endif do k = 1,nr do j = jmin,jmax xx_obcsw1 (j,k,bi,bj,iobcs) = tmpfldyz (j,k,bi,bj) cgg & * maskyz (j,k,bi,bj) enddo enddo enddo enddo endif c-- Add control to model variable. do bj = jtlo, jthi do bi = itlo, ithi c-- Calculate mask for tracer cells (0 => land, 1 => water). do k = 1,nr do j = 1,sny i = OB_Iw(j,bi,bj) IF ( i.EQ.OB_indexNone ) i = 1 if (iobcs .EQ. 1) then OBWt(j,k,bi,bj) = OBWt (j,k,bi,bj) & + obcswfac *xx_obcsw0(j,k,bi,bj,iobcs) & + (1. _d 0 - obcswfac)*xx_obcsw1(j,k,bi,bj,iobcs) OBWt(j,k,bi,bj) = OBWt(j,k,bi,bj) & *maskW(i+ip1,j,k,bi,bj) else if (iobcs .EQ. 2) then OBWs(j,k,bi,bj) = OBWs (j,k,bi,bj) & + obcswfac *xx_obcsw0(j,k,bi,bj,iobcs) & + (1. _d 0 - obcswfac)*xx_obcsw1(j,k,bi,bj,iobcs) OBWs(j,k,bi,bj) = OBWs(j,k,bi,bj) & *maskW(i+ip1,j,k,bi,bj) else if (iobcs .EQ. 3) then OBWu(j,k,bi,bj) = OBWu (j,k,bi,bj) & + obcswfac *xx_obcsw0(j,k,bi,bj,iobcs) & + (1. _d 0 - obcswfac)*xx_obcsw1(j,k,bi,bj,iobcs) OBWu(j,k,bi,bj) = OBWu(j,k,bi,bj) & *maskW(i+ip1,j,k,bi,bj) else if (iobcs .EQ. 4) then OBWv(j,k,bi,bj) = OBWv (j,k,bi,bj) & + obcswfac *xx_obcsw0(j,k,bi,bj,iobcs) & + (1. _d 0 - obcswfac)*xx_obcsw1(j,k,bi,bj,iobcs) OBWv(j,k,bi,bj) = OBWv(j,k,bi,bj) & *maskS(i,j,k,bi,bj) endif enddo enddo enddo enddo C-- End over iobcs loop enddo #endif /* ALLOW_OBCSW_CONTROL */ return end