!-------------------------------------- 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:
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!
!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 --------------------------------------
!
!
!  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 psi2vort(pvort,ppsi) 1,4
!
!**s/r psi2vort  - Compute gridpoint relative vorticity from gridpoint streamfunction.
!
!
!Author  : Luc Fillion  - MSC- 16 Sept 04.
!Revision:
!
!     -------------------
!
!Arguments
!
      IMPLICIT NONE
!
#include "taglam4d.cdk"
#include "comdim.cdk"
#include "comcst.cdk"
!
      real*8 pvort(ni,nflev,nj)
      real*8 ppsi(ni,nflev,nj)
!
      integer ji,jj,jk,nijk,nij
      real*8 zcon,ztwopi
      real*8 zwh(ni,nj)
      real*8 zwlap(ni,nj,nflev)
!
!!
      ztwopi=2.0*rpi
      nij=ni*nj
      nijk=ni*nj*nflev
      call zero(nijk,zwlap)
      call zero(nij,zwh)
      call zero(nijk,pvort)
!
      do jk=1,nflev
        do ji=1,ni
        do jj=1,nj
          zwh(ji,jj)=ppsi(ji,jk,jj)
        enddo
        enddo
        call lap(zwlap(1,1,jk),zwh,'P')
      enddo
!
      do jk=1,nflev
        do ji=1,ni
        do jj=1,nj
          pvort(ji,jk,jj)=zwlap(ji,jj,jk)
        enddo
        enddo
      enddo
!
      return
      end