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*** s/r caldiv_2_ad - ADJ of caldiv_2 
*
#include "model_macros_f.h"
*

      subroutine caldiv_2_ad ( F_div, F_uu, F_vv, DIST_DIM, Nk ) 4
*
      implicit none
*
      integer  DIST_DIM, Nk
      real     F_div(DIST_SHAPE,Nk), F_uu  (DIST_SHAPE,Nk),
     $         F_vv (DIST_SHAPE,Nk)
*
*author
*     M.Tanguay
*
*revision
* v2_10 - Tanguay M.        - initial MPI version
* v3_11 - Tanguay M.        - AIXport+Opti+OpenMP for TLM-ADJ
*
*object
*     see id section 
*
*arguments
*  Name        I/O                 Description
*----------------------------------------------------------------
* F_div        I/O        the resulted divergence field on G-grid
* F_uu         I/O        wind-like field on U-grid
* F_vv         I/O        wind-like field on V-grid
*----------------------------------------------------------------
* 
*implicits
#include "glb_ld.cdk"
#include "geomg.cdk"
*
      integer i, j, k, i0, in, j0, jn
      real*8 inv_hxu_8(XDIST_SHAPE), inv_cy2_8(YDIST_SHAPE),
     $       inv_hsyv_8(YDIST_SHAPE)
*     __________________________________________________________________
*
*
      i0 = 1
      in = l_niu
      j0 = 1
      jn = l_njv
      if ((G_lam).and.(l_west)) i0 = 2
      if (l_south) j0 = 2
*
      do i = i0-1, in
         inv_hxu_8(i) = 1.0d0 / Geomg_hxu_8(i)
      end do
*
      do j = 1, l_nj
         inv_cy2_8(j)  = 1.0d0 / Geomg_cy2_8(j)
         inv_hsyv_8(j) = 1.0d0 / Geomg_hsyv_8(j)
      end do
      inv_hsyv_8(0) = 1.0d0 / Geomg_hsyv_8(0)
*
      do k=Nk,1,-1
*
         if (.not.G_lam) then
            if (l_north) then
            do i = in, i0, -1
*
             F_vv(i,  l_nj-1,k)   =   - F_div(i,l_nj,k)   *inv_hsyv_8(l_nj-1)
     %                                       + F_vv(i,  l_nj-1,k)
             F_uu(i,  l_nj,  k)   = (   F_div(i,l_nj,k) ) *
     %                         ( inv_cy2_8(l_nj)*inv_hxu_8(i-1) )
     %                                       + F_uu(i,  l_nj,  k)
             F_uu(i-1,l_nj,  k)   = ( - F_div(i,l_nj,k) ) *
     %                         ( inv_cy2_8(l_nj)*inv_hxu_8(i-1) )
     %                                       + F_uu(i-1,l_nj,  k)
            F_div(i,  l_nj,  k)   = 0. 
*
            end do
            endif
*
            if (l_south) then
            do i = in, i0, -1 
*
              F_vv(i,  1,k) =      F_div(i,1,k)   *inv_hsyv_8(0)
     %                                            + F_vv(i,  1,k)
              F_uu(i,  1,k) = (    F_div(i,1,k) ) * 
     %                      ( inv_cy2_8(1)*inv_hxu_8(i-1) )
     %                                            + F_uu(i,  1,k)
              F_uu(i-1,1,k) = ( -  F_div(i,1,k) ) *
     %                      ( inv_cy2_8(1)*inv_hxu_8(i-1) )
     %                                            + F_uu(i-1,1,k)
             F_div(i,  1,k) = 0. 
*
            end do
            endif
         endif
*
         do j = jn, j0, -1
         do i = l_niu, i0, -1
*
            F_vv(i,  j,  k) = ( F_div(i,j,k) )*inv_hsyv_8(j-1) + F_vv(i,j,  k)
            F_vv(i,  j-1,k) = (-F_div(i,j,k) )*inv_hsyv_8(j-1) + F_vv(i,j-1,k)
            F_uu(i,  j,  k) = ( F_div(i,j,k) )*
     %                   ( inv_cy2_8(j)*inv_hxu_8(i-1) )
     %                                                         + F_uu(i,j,  k)
            F_uu(i-1,j,  k) = (-F_div(i,j,k) )*
     %                   ( inv_cy2_8(j)*inv_hxu_8(i-1) )
     %                                                         + F_uu(i-1,j,k)
           F_div(i,  j,  k) = 0.
*
         end do
         end do
*
      end do
*
      return
      end