!-------------------------------------- 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 
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!
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!See the above mentioned License/Disclaimer for more details.
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!-------------------------------------- LICENCE END --------------------------------------
***s/r hzd_solfft_1d_ad - ADJ of hzd_solfft_1d 
*
#include "model_macros_f.h"
*

       subroutine hzd_solfft_1d_ad (F_sol, F_Rhs_8, F_pri_8, F_deltai_8, 3
     %             minx1, maxx1, minx2, maxx2, nx1, nx2, nx3, F_pwr,
     %             minx,maxx,miny,maxy,gnk,gni,nil,njl,nkl,
     %             F_opsxp0_8, F_opsyp0_8,F_cdiff,F_npex,F_npey)
*
      implicit none
*
      integer  minx1, maxx1, minx2, maxx2 , nx1, nx2, nx3, F_pwr,
     $         minx , maxx , miny , maxy  , gnk, gni,
     $         njl  , nkl  , nil  , F_npex, F_npey
      real*8  F_opsxp0_8(*), F_opsyp0_8(*),F_pri_8,
     $        F_deltai_8(1:F_pwr,1:F_pwr,1:gni,nx3),F_Rhs_8
      real   F_cdiff, F_sol(minx:maxx,miny:maxy,gnk)
*
*author
*    M.Tanguay
*
*revision
* v3_20 - Tanguay M.        - initial version
* v3_21 - Tanguay M.        - Revision Openmp
*
*object
*    see id section
*
*arguments
*  Name        I/O                 Description
*----------------------------------------------------------------
*  F_sol       I/O      r.h.s. and result of horizontal diffusion
*  F_Rhs_8     I/O      work vector
*----------------------------------------------------------------
*implicits
#include "ptopo.cdk"
**
      real*8   fdg1_8( miny:maxy, minx1:maxx1,gni+  F_npex),
     $         fwft_8( miny:maxy ,minx1:maxx1,gni+2+F_npex)
*
      real*8   ZERO_8, b_8, fact_8
      parameter( ZERO_8 = 0.0 )      
*
      integer o1,o2,i,j,k,jw,m,offj,indy
*
*     __________________________________________________________________
*
*----------------------
*Zero adjoint variables
*----------------------
*
!$omp parallel
*
!$omp do 
      do k= 1,gni+F_npex
      do j= minx1,maxx1
      do i= miny ,maxy
      fdg1_8(i,j,k) = ZERO_8
      end do
      end do
      end do
!$omp end do 
*
!$omp do 
      do k= 1,gni+2+F_npex
      do j= minx1,maxx1
      do i= miny ,maxy
      fwft_8(i,j,k) = ZERO_8
      end do
      end do
      end do
!$omp end do 
*
!$omp end  parallel 
*
* ----------
* ADJ of
* Resolution
* ----------
*
*     ADJ of
*     inverse projection ( r = x * w )
*     --------------------------------
*
      call rpn_comm_transpose48 ( F_sol, Minx, Maxx, Gni,1, (Maxy-Miny+1),
     %                          (Maxy-Miny+1),minx1, maxx1, Gnk, fwft_8, 1,
     %                             1.d0,0.d0)
*
!$omp parallel private(indy) 
*
c     call ffft8 ( fwft_8, (Maxy-Miny+1) * (maxx1-minx1+1), 1,
c    %                               (Maxy-Miny+1) * Nkl, -1 )
*
!$omp do
      do k=Nkl,1,-1
         call ffft8 (fwft_8(miny,k,1),(Maxy-Miny+1)*(maxx1-minx1+1),
     %                     1, (Maxy-Miny+1) , -1 )
      enddo
!$omp enddo
*
!$omp do
      do k = nkl,1,-1
         do j = (Maxy-Miny+1),1,-1
            fwft_8(j,k,Gni+2) = ZERO_8
            fwft_8(j,k,2)     = ZERO_8
            fwft_8(j,k,2)     = fwft_8(j,k,1) + fwft_8(j,k,2)
            fwft_8(j,k,1)     = ZERO_8
         enddo
         do j=njl,1,-1
         do i = Gni,1,-1
            fdg1_8(j,k,i)   = fwft_8(j,k,i+1) + fdg1_8(j,k,i)
            fwft_8(j,k,i+1) = ZERO_8
         enddo
         enddo
      enddo
!$omp enddo
*
*     ADJ of
*     Scaling only (WE DO NOT RESOLVE A TRIDIAGONAL MATRIX in Y)
*     ----------------------------------------------------------
*
      offj = Ptopo_gindx(3,Ptopo_myproc+1)-1
*
!$omp do
      do i = 1,gni
      do k = 1,nkl
      do j = 1,njl
         indy = offj + j
         fwft_8(j,k,i+1)= F_opsyp0_8(nx3+indy)*
     %                   (F_deltai_8(F_pwr,1,i,indy)*fdg1_8(j,k,i)) + fwft_8(j,k,i+1) 
C        fdg1_8(j,k,i)  = ZERO_8
      enddo
      enddo
      enddo
!$omp enddo
*
*     ADJ of
*     projection ( wfft = x transposed * g )
*     --------------------------------------
*
!$omp do 
      do k = 1, Nkl
         do j = 1, (Maxy-Miny+1)
            fwft_8(j,k,1) = fwft_8(j,k,2) + fwft_8(j,k,1)
            fwft_8(j,k,2) = ZERO_8
            fwft_8(j,k,Gni+2) = ZERO_8
         enddo
      enddo
!$omp enddo 
*
!$omp do 
      do i = 0, (Gni)/2
         do k = 1, Nkl
C           do jw = 1, (Maxy-Miny+1)
            do jw = 1, njl
               fwft_8(jw,k,2*i+2) = F_pri_8 * fwft_8(jw,k,2*i+2)
               fwft_8(jw,k,2*i+1) = F_pri_8 * fwft_8(jw,k,2*i+1)
            enddo
         enddo
      enddo
!$omp enddo 
*
C     call ffft8 (fwft_8,(Maxy-Miny+1)*(maxx1-minx1+1),
C    %                     1, (Maxy-Miny+1) * Nkl,  1 )
*
!$omp do
      do k=Nkl,1,-1
         call ffft8 (fwft_8(Miny,k,1),(Maxy-Miny+1)*(maxx1-minx1+1),1,
     %                               (Maxy-Miny+1), +1 )
      enddo
!$omp enddo
*
C!$omp do
C      do i= 1,gni+2
C         do k=minx1,0
C            do j= miny,maxy
C               fwft_8(j,k,i) = ZERO_8
C            enddo
C         enddo
C      enddo
C!$omp enddo
*
      fact_8=((-1)**F_pwr)*dble(F_cdiff)
*
!$omp do
      do i = 1, Gni
         do k=1,nkl
           do j=1,njl
              fdg1_8(j,k,i) = fact_8*(F_opsxp0_8(gni+i)*fwft_8(j,k,i)) 
C             fdg1_8(j,k,i) = F_opsxp0_8(gni+i)*fwft_8(j,k,i) 
C             fwft_8(j,k,i) = ZERO_8
           enddo
C          do j= miny,0
C             fwft_8(j,k,i) = ZERO_8
C          enddo
         enddo
*
C        do k= nkl+1, maxx1
C          do j= miny,maxy
C             fwft_8(j,k,i) = ZERO_8
C          enddo
C        enddo
*
C        do k = 1, nkl
C          do j= njl+1,maxy
C             fwft_8(j,k,i) = ZERO_8
C          enddo
C        enddo
*
      enddo
!$omp enddo
*
!$omp end parallel 
*
      call rpn_comm_transpose48 ( F_sol, Minx, Maxx, Gni,1, (Maxy-Miny+1),
     %                          (Maxy-Miny+1),minx1, maxx1, Gnk, fdg1_8, -1,
C    %                             fact_8,0.d0)
     %                             1.d0,0.d0)
*
C!$omp parallel do 
C      do k = 1, Gnk
C      do j = 1, njl
C      do i = 1, nil
C         F_sol(i,j,k) = fact_8*F_sol(i,j,k)
C      enddo
C      enddo
C      enddo
C!$omp end parallel do 
*
*     __________________________________________________________________
*
      return
      end