!-------------------------------------- LICENCE BEGIN ------------------------------------
!Environment Canada - Atmospheric Science and Technology License/Disclaimer, 
!                     version 3; Last Modified: May 7, 2008.
!This is free but copyrighted software; you can use/redistribute/modify it under the terms 
!of the Environment Canada - Atmospheric Science and Technology License/Disclaimer 
!version 3 or (at your option) any later version that should be found at: 
!http://collaboration.cmc.ec.gc.ca/science/rpn.comm/license.html 
!
!This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
!without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
!See the above mentioned License/Disclaimer for more details.
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!-------------------------------------- LICENCE END --------------------------------------
***s/r adw_pols_ad - ADJ of adw_pols 
*

      subroutine adw_pols_ad ( F_field, F_wx_8,    F_j, 8
     %                         F_nic,   F_halox,
     %                         F_njc,   F_haloy, F_nk )
*
#include "impnone.cdk"
*
      integer  F_j, F_nic, F_halox, F_njc, F_haloy, F_nk
*
      real F_field (-F_halox+1:F_nic+F_halox,
     %              -F_haloy+1:F_njc+F_haloy, F_nk)
*
      real*8 F_wx_8 (F_nic)
*
*author
*     monique tanguay
*
*revision
* v2_31 - Tanguay M.        - initial MPI version
* v3_21 - Tanguay M.        - Revision Openmp
*
*language
*     fortran 77
*
*object
*     see id section
*
*ADJ of
*arguments
*______________________________________________________________________
*              |                                                 |     |
* NAME         | DESCRIPTION                                     | I/O |
*--------------|-------------------------------------------------|-----|
*              |                                                 |     |
* F_field      | field to treat                                  |  io |
* F_wx_8       | weights (proportional to x grid distances)      |  i  |
* F_j          | j position to fill                              |  i  |
*              |                                                 |     |
* F_nic        | number of points in x direction (advection grid)|  i  |
* F_njc        | number of points in y direction (advection grid)|  i  |
*              |                                                 |     |
* F_halox      | size of halo in x direction (advection grid)    |  i  |
* F_haloy      | size of halo in y direction (advection grid)    |  i  |
*              |                                                 |     |
* F_nk         | number of levels                                |  i  |
*______________|_________________________________________________|_____|
*
*implicits
*     none
*
*modules
*     none
************************************************************************
      integer i,j,k
*
      real*8 ZERO_8
      parameter (ZERO_8=0.0)
*
      real*8 ww_8
*
*     Zero adjoint variables
*     ----------------------
      ww_8 = ZERO_8
*
*     TRAJECTORY
*     ----------
      if ( F_j .eq. 0 ) then
                             j = 1
      else
                             j = F_njc
      endif
*
*     ADJ
*     ---
!$omp do 
      do k = 1,F_nk
*
         do i=F_nic+F_halox,-F_halox+1,-1
            ww_8             = dble(F_field(i,F_j,k)) + ww_8
            F_field(i,F_j,k) = ZERO_8
         enddo
*
         do i=F_nic,1,-1
            F_field(i,j,k) = F_wx_8(i) * ww_8 + F_field(i,j,k)
         enddo
*
         ww_8 = ZERO_8
*
      enddo
!$omp enddo 
*
      return
      end