!-------------------------------------- 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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!-------------------------------------- LICENCE END --------------------------------------
!
C
C  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
C

      subroutine sqrtc 2,2
*
***s/r sqrtc  - Sqrt(C) * increment(control variable)
*
*
*Author  : Luc Fillion - MSC/CAN - Jan 2003.
*Revision:
* Luc Fillion - ARMA/EC - 14 Jan 2009 - Upgrade lam4d to v_10_1_2 of 3dvar. Extra dimension for CORNS.
*
*     -------------------
**    Purpose: Used for XD-Var analysis
*
*Arguments
*     none
*
      IMPLICIT NONE
*
#include "taglam4d.cdk"
#include "comdim.cdk"
#include "comct0.cdk"
#include "comlun.cdk"
#include "comsim.cdk"
#include "comcorr.cdk"
#include "comfftla.cdk"
#include "comsp.cdk"
#include "comcva.cdk"
#include "com1obs.cdk"
*
      integer ji,jj,jrow,jcol,jk,jla,jband,jm,ila
      integer idim,iflag,inbandhf
      integer idum1,idum2,idum3,idum4
      real*8 zmin,zmax
!
      real*8 zsp(nksdim,2,maxbpop)
      real*8 zsp2(nksdim2,2,maxbpop)
      real*8 zsp3(nksdim2,2,maxbpop)
!
      real*8 zcon
      real*8 zsp1(nla,2)
      real*8 zsprpn(ni+2,nj+2)
*
**
      inbandhf = nband
!
      call normsphalf
!
      if(lsw) then       ! Barotropic 
        do jband = 1, nband
          do jm = 1, mbandsp(jband)
            ila=mila(jm,jband) 
            do jk = 1, nksdim  ! psi,chiu,phiu etc...
              sp(ila,1,jk) = corns(jk,jk,jband-1,1)*sp(ila,1,jk)
              sp(ila,2,jk) = corns(jk,jk,jband-1,1)*sp(ila,2,jk)
            enddo
          enddo
        enddo
      else                   ! Baroclinic
        do jband = 1, inbandhf
          if(nanalvar.eq.4) then
            do jm = 1, mbandsp(jband)
              ila = mila(jm,jband) 
              do jk = 1, nksdim
                zsp(jk,1,jm) = splat(ila,1,jk,1)
                zsp(jk,2,jm) = splat(ila,2,jk,1)
              enddo
            enddo
          else
            do jm = 1, mbandsp(jband)
              ila = mila(jm,jband) 
              do jk = 1, nksdim
                zsp(jk,1,jm) = sp(ila,1,jk)
                zsp(jk,2,jm) = sp(ila,2,jk)
              enddo
            enddo
          endif
!
!*        Compute (corns(nksdim,nksdim,jtotwvnb,1) * zsp)
!
          idim=2*mbandsp(jband)
!
          CALL MXMAOP(CORNS(1,1,jband-1,1),1,NKSDIM2,zsp(1,1,1),1,NKSDIM
     +        ,ZSP2(1,1,1),1,NKSDIM2,NKSDIM2,NKSDIM,idim)
!
!          write(nulout,*) 'sqrtc: jband=',jband
!          do jk=1,nksdim
!          do jm = 1, mbandsp(jband)
!            if(zsp2(jk,1,jm).ne.zsp3(jk,1,jm)) then
!         call abort3d(nulout,'TMXMAOP: R:zsp2.ne.zsp3')
!            else if(zsp2(jk,2,jm).ne.zsp3(jk,2,jm)) then
!         call abort3d(nulout,'TMXMAOP: I:zsp2.ne.zsp3')
!            endif
!          enddo
!          enddo
!
          do jm = 1, mbandsp(jband)
            ila=mila(jm,jband) 
            do jk = 1, nksdim
              sp(ila,1,jk) = zsp2(jk,1,jm)
              sp(ila,2,jk) = zsp2(jk,2,jm)
            enddo
          enddo
!
          if(nanalvar.eq.4) then
            do jm = 1, mbandsp(jband)
              ila=mila(jm,jband) 
              do jk = 1, nflev
                sptb(ila,1,jk) = zsp2(jk+nksdim,1,jm)
                sptb(ila,2,jk) = zsp2(jk+nksdim,2,jm)
              enddo
            enddo
          endif
!
        enddo ! jband
      endif
!
      do jband = inbandhf+1, nbandtot
        do jm = 1, mbandsp(jband)
            do jk = 1, nksdim  ! psi,chiu,phiu etc...
            ila=mila(jm,jband) 
            sp(ila,1,jk) = 0.0
            sp(ila,2,jk) = 0.0
          enddo
        enddo
      enddo
!
      if(nanalvar.eq.4) then
        do jband = inbandhf+1, nbandtot
          do jm = 1, mbandsp(jband)
            do jk = 1, nflev
              ila=mila(jm,jband) 
              sptb(ila,1,jk) = 0.0
              sptb(ila,2,jk) = 0.0
            enddo
          enddo
        enddo
      endif
!
      return
      end