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!                     version 3; Last Modified: May 7, 2008.
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***s/r  bac_ad - ADJ of bac_tl
*
#include "model_macros_f.h"
*

      subroutine bac_ad( Itr, Itnlh ) 1,1
*
      implicit none
*
      integer Itr, Itnlh
*
*author
*     M.Tanguay
*
*revision
* v2_10 - Tanguay M.        - initial MPI version
* v2_21 - Tanguay M.        - reduce standard output as in model 
* v2_30 - Edouard S.        - remove pi' at the top (pptt0) - hybrid version
* v2_31 - Tanguay M.        - adapt for vertical hybrid coordinate 
*                           - adapt for tracers in tr3d  
* v3_03 - Tanguay M.        - Adjoint NoHyd configuration 
* v3_11 - Tanguay M.        - AIXport+Opti+OpenMP for TLM-ADJ
* 
*object
*     see id section
*     ------------------------------------------------------------------------
*     REMARK: INPUT TRAJ: F_gptxm, F_rthm, F_nthm,
*                         F_r3m, F_r3pm, F_rvvm, F_n3m, F_n3pm (NoHyd)
*     ------------------------------------------------------------------------
*
*arguments
*  Name        I/O                 Description
*----------------------------------------------------------------
*  Itr          I           current nonlinear iteration number
*  Itnlh        I           total number of nonlinear iterations
*----------------------------------------------------------------
*
*implicits
#include "glb_ld.cdk"
#include "lun.cdk"
#include "schm.cdk"
#include "p_geof.cdk"
#include "rhsc.cdk"
#include "nl.cdk"
#include "vt0.cdk"
#include "vtx.cdk"
#include "rhscm.cdk"
#include "nlm.cdk"
#include "vtxm.cdk"
*
*modules
      integer  vmmlod, vmmget, vmmuld
      external vmmlod, vmmget, vmmuld 
*
      integer pnerr, pnlod, pnlkey1(60), i, j, k 
*
      real*8  ZERO_8 
      parameter( ZERO_8=0.0 )
*
      real wijk0 (LDIST_SHAPE,l_nk),wijk1 (LDIST_SHAPE,l_nk)
      real wijk0m(LDIST_SHAPE,l_nk),wijk1m(LDIST_SHAPE,l_nk)
*
*     ______________________________________________________
*
      if (Lun_debug_L) write(Lun_out,1000)
*
      pnlkey1(1) = VMM_KEY(st0)
      pnlkey1(2) = VMM_KEY(pipt0)
      pnlkey1(3) = VMM_KEY(qt0)
      pnlkey1(4) = VMM_KEY(fit0)
      pnlkey1(5) = VMM_KEY(fipt0)
      pnlkey1(6) = VMM_KEY(topo)
      pnlkey1(7) = VMM_KEY(tt0)
      pnlkey1(8) = VMM_KEY(tpt0)
      pnlkey1(9) = VMM_KEY(tplt0)
      pnlkey1(10)= VMM_KEY(ut0)
      pnlkey1(11)= VMM_KEY(vt0)
      pnlkey1(12)= VMM_KEY(psdt0)
      pnlkey1(13)= VMM_KEY(tdt0)
      pnlkey1(14)= VMM_KEY(gptx)
      pnlkey1(15)= VMM_KEY(gxtx)
      pnlkey1(16)= VMM_KEY(ru)
      pnlkey1(17)= VMM_KEY(rv)
      pnlkey1(18)= VMM_KEY(rcn)
      pnlkey1(19)= VMM_KEY(rth)
      pnlod = 19 
*
      if (.not. Schm_hydro_L) then
         pnlkey1(pnlod+1) = VMM_KEY(qpt0)
         pnlkey1(pnlod+2) = VMM_KEY(wt0)
         pnlkey1(pnlod+3) = VMM_KEY(mut0)
         pnlkey1(pnlod+4) = VMM_KEY(multx)
         pnlkey1(pnlod+5) = VMM_KEY(rvv)
         pnlkey1(pnlod+6) = VMM_KEY(r3)
         pnlkey1(pnlod+7) = VMM_KEY(r3p)
         pnlod = pnlod+7
      endif
*
*     TRAJECTORY
*     ----------
      pnlkey1(pnlod + 1) = VMM_KEY(gptxm)
      pnlkey1(pnlod + 2) = VMM_KEY(rthm)
      pnlod = pnlod + 2 
*
      if (.not. Schm_hydro_L) then
         pnlkey1(pnlod+1) = VMM_KEY(rvvm)
         pnlkey1(pnlod+2) = VMM_KEY(r3m)
         pnlkey1(pnlod+3) = VMM_KEY(r3pm)
         pnlod = pnlod+3
      endif
*
      pnerr = vmmlod(pnlkey1,pnlod)
*
      pnerr = VMM_GET_VAR(st0)
      pnerr = VMM_GET_VAR(pipt0)
      pnerr = VMM_GET_VAR(qt0)
      pnerr = VMM_GET_VAR(fit0)
      pnerr = VMM_GET_VAR(fipt0)
      pnerr = VMM_GET_VAR(topo)
      pnerr = VMM_GET_VAR(tt0)
      pnerr = VMM_GET_VAR(tpt0)
      pnerr = VMM_GET_VAR(tplt0)
      pnerr = VMM_GET_VAR(ut0)
      pnerr = VMM_GET_VAR(vt0)
      pnerr = VMM_GET_VAR(psdt0)
      pnerr = VMM_GET_VAR(tdt0)
      pnerr = VMM_GET_VAR(gptx)
      pnerr = VMM_GET_VAR(gxtx)
      pnerr = VMM_GET_VAR(ru)
      pnerr = VMM_GET_VAR(rv)
      pnerr = VMM_GET_VAR(rcn)
      pnerr = VMM_GET_VAR(rth)
*
      if (.not. Schm_hydro_L) then
         pnerr = VMM_GET_VAR(qpt0)
         pnerr = VMM_GET_VAR(wt0)
         pnerr = VMM_GET_VAR(mut0)
         pnerr = VMM_GET_VAR(multx)
         pnerr = VMM_GET_VAR(rvv)
         pnerr = VMM_GET_VAR(r3)
         pnerr = VMM_GET_VAR(r3p)
      else
         qpt0_ = 0
         wt0_  = 0
         mut0_ = 0
         multx_= 0
         rvv_  = 0
         r3_   = 0
         r3p_  = 0
      endif
*
*     TRAJECTORY
*     ----------
      pnerr = VMM_GET_VAR(gptxm)
      pnerr = VMM_GET_VAR(rthm)
*
      if (.not. Schm_hydro_L) then
         pnerr = VMM_GET_VAR(rvvm)
         pnerr = VMM_GET_VAR(r3m)
         pnerr = VMM_GET_VAR(r3pm)
      else
         rvvm_  = 0
         r3m_   = 0
         r3pm_  = 0
      endif
*
*     Zero adjoint variables
*     ----------------------
      do k=1,l_nk
      do j=l_miny,l_maxy
      do i=l_minx,l_maxx
      wijk0(i,j,k) = ZERO_8 
      wijk1(i,j,k) = ZERO_8 
      enddo
      enddo
      enddo
*
      call  bacp_2_ad
     %             ( Itr   , Itnlh  , st0     , pipt0  , qt0     ,
     %               fit0  , fipt0  , topo    , tt0    , tpt0    , tplt0,
     %               ut0   , vt0    , psdt0   , tdt0   ,
     %               qpt0  , wt0    , mut0    , multx  , gptx    , gxtx ,
     %               ru    , rv     , rth     , r3     , r3p     , rvv  , rcn,
     %               nl_nu , nl_nv  , nl_nth  , nl_n3  , nl_n3p  ,
     %               nl_ncn, wijk0  , wijk1   ,
*
     %                                                   gptxm   ,
     %                                rthm    , r3m    , r3pm    , rvvm ,
     %                                nlm_nthm, nlm_n3m, nlm_n3pm,
     %                       wijk0m , wijk1m  ,
*
     %               LDIST_DIM, l_nk )
*
      pnerr = vmmuld(-1,0)

1000  format (5X,' ADJ of BACK SUBSTITUTION: (S/R BAC_AD)')

      return
      end