!-------------------------------------- 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
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!See the above mentioned License/Disclaimer for more details.
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!
!
!  X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
!

      subroutine inmi_soldiv(pddiv,pp,pvort,ldwrite),7
!
!**s/r inmi_soldiv  - Solves for del(div) corrections in vertical normal mode space.
!                     Ref.: Temperton & Roch (1991).MWR 116, 667-677.
!                     Input pp,pvort are in vertical mode space.
!Author  : Luc Fillion - ARMA/EC - 1 May 2007.
!Revision: 
! Luc Fillion - ARMA/EC - May 2010 - Implemented in v_11_01b of 3dvar.
!
!     -------------------
!
!Arguments
!
      IMPLICIT NONE
!
#include "taglam4d.cdk"
#include "pardim.cdk"
#include "comdim.cdk"
#include "comcst.cdk"
#include "comlun.cdk"
#include "comode.cdk"
#include "comin.cdk"
!
      logical ldwrite
      real*8 pddiv(ni,nflev,nj)
      real*8 pp(ni,nflev,nj)
      real*8 pvort(ni,nflev,nj)
!
      character*3 clvar
      character*8 clletiket
      integer ji,jj,jk
      real*8 zf0,zf02,zcon,zicon
      real*8 zvert1(nflev),zvert2(nflev)
      real*8 zw2d1(ni,nj)
      real*8 zw2d2(ni,nj)
      real*8 zw2d3(ni,nj)
      real*8 zfld(ni,nflev,nj)
!
!!
      call zero(ni*nj*nflev,pddiv)
!
      zf0=2.*romega
      zf02=zf0**2
!
!*1.  Loop on vertical normal modes
!     -----------------------------
!
      do jk=1,nvmod
!
!       Build rhs of del(div) (eqn. 4.35, T88)  *********
!
        do ji=1,ni
          do jj=1,nj
            zw2d1(ji,jj)=pp(ji,jk,jj)
          enddo
        enddo
!
        call lap(zw2d2,zw2d1,'S')
!
        do ji=1,ni
          do jj=1,nj
            zw2d3(ji,jj)=zw2d2(ji,jj)-zf0*pvort(ji,jk,jj)
          enddo
        enddo
!
!       Solve for dPhig/dt   *********
!
        zcon = -zf02/eqdepth(jk)
        call invhelmc(zw2d1,zcon,zw2d3,'S')
!
!       Convert to del(div)  *********
!
        do jj=1,nj
          do ji=1,ni
            pddiv(ji,jk,jj)=zw2d1(ji,jj)/eqdepth(jk)
          enddo
        enddo
      enddo
!
!*2.  Transform to gridpoint space for output on file
!     -----------------------------------------------
!
      do jj=1,nj
        do ji=1,ni
          call zero(nflev,zvert1)
          do jk=1,nflev
            zvert1(jk)=pddiv(ji,jk,jj)
          enddo
          call mxv(zvert2,vmat,zvert1,nflev,nflev)
          do jk=1,nflev
            zfld(ji,jk,jj) = zvert2(jk)
          enddo
        enddo
      enddo
!
!*3.  Output on file if desired
!     -------------------------
!
      if(ldwrite.or.lminend) then
!
!       Del(Div) in vertical mode space
!
        clletiket='INMIDIVP'
        clvar = 'DD '
        call write_fld(pddiv,clvar,clletiket,nflev)
!
!       Del(Div) in gridpoint space
!
        clletiket='INMIDIV'
        clvar = 'DD '
        call write_fld(zfld,clvar,clletiket,nflev)
      endif
!
      return
      end