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!**********************************************************************
! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010         *
! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa,             *
! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann   *
!                                                                     *
! This file is part of FLEXPART.                                      *
!                                                                     *
! FLEXPART is free software: you can redistribute it and/or modify    *
! it under the terms of the GNU General Public License as published by*
! the Free Software Foundation, either version 3 of the License, or   *
! (at your option) any later version.                                 *
!                                                                     *
! FLEXPART 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       *
! GNU General Public License for more details.                        *
!                                                                     *
! You should have received a copy of the GNU General Public License   *
! along with FLEXPART.  If not, see <http://www.gnu.org/licenses/>.   *
!**********************************************************************

subroutine convmix(itime)
  !                     i
  !**************************************************************
  !handles all the calculations related to convective mixing
  !Petra Seibert, Bernd C. Krueger, Feb 2001
  !nested grids included, Bernd C. Krueger, May 2001
  !
  !Changes by Caroline Forster, April 2004 - February 2005:
  !  convmix called every lsynctime seconds
  !CHANGES by A. Stohl:
  !  various run-time optimizations - February 2005
  !**************************************************************

  use flux_mod
  use par_mod
  use com_mod
  use conv_mod

  implicit none

  integer :: igr,igrold, ipart, itime, ix, j, inest
  integer :: ipconv
  integer :: jy, kpart, ktop, ngrid,kz
  integer :: igrid(maxpart), ipoint(maxpart), igridn(maxpart,maxnests)
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  ! itime [s]                 current time
  ! igrid(maxpart)            horizontal grid position of each particle
  ! igridn(maxpart,maxnests)  dto. for nested grids
  ! ipoint(maxpart)           pointer to access particles according to grid position

  logical :: lconv
  real :: x, y, xtn,ytn, ztold, delt
  real :: dt1,dt2,dtt
  integer :: mind1,mind2
  ! dt1,dt2,dtt,mind1,mind2       variables used for time interpolation
  integer :: itage,nage
  real,parameter :: eps=nxmax/3.e5


  !monitoring variables
  !real sumconv,sumall


  ! Calculate auxiliary variables for time interpolation
  !*****************************************************

  dt1=real(itime-memtime(1))
  dt2=real(memtime(2)-itime)
  dtt=1./(dt1+dt2)
  mind1=memind(1)
  mind2=memind(2)
  delt=real(abs(lsynctime))


  lconv = .false.

  ! if no particles are present return after initialization
  !********************************************************

  if (numpart.le.0) return

  ! Assign igrid and igridn, which are pseudo grid numbers indicating particles
  ! that are outside the part of the grid under consideration
  ! (e.g. particles near the poles or particles in other nests).
  ! Do this for all nests but use only the innermost nest; for all others
  ! igrid shall be -1
  ! Also, initialize index vector ipoint
  !************************************************************************

  do ipart=1,numpart
    igrid(ipart)=-1
    do j=numbnests,1,-1
      igridn(ipart,j)=-1
    end do
    ipoint(ipart)=ipart
  ! do not consider particles that are (yet) not part of simulation
    if (itra1(ipart).ne.itime) goto 20
    x = xtra1(ipart)
    y = ytra1(ipart)

  ! Determine which nesting level to be used
  !**********************************************************

    ngrid=0
    do j=numbnests,1,-1
      if ( x.gt.xln(j)+eps .and. x.lt.xrn(j)-eps .and. &
           y.gt.yln(j)+eps .and. y.lt.yrn(j)-eps ) then
        ngrid=j
        goto 23
      endif
    end do
 23   continue

  ! Determine nested grid coordinates
  !**********************************

    if (ngrid.gt.0) then
  ! nested grids
      xtn=(x-xln(ngrid))*xresoln(ngrid)
      ytn=(y-yln(ngrid))*yresoln(ngrid)
      ix=nint(xtn)
      jy=nint(ytn)
      igridn(ipart,ngrid) = 1 + jy*nxn(ngrid) + ix
    else if(ngrid.eq.0) then
  ! mother grid
      ix=nint(x)
      jy=nint(y)
      igrid(ipart) = 1 + jy*nx + ix
    endif

 20 continue
  end do

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  ! sumall = 0.
  ! sumconv = 0.
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  !*****************************************************************************
  ! 1. Now, do everything for the mother domain and, later, for all of the nested domains
  ! While all particles have to be considered for redistribution, the Emanuel convection
  ! scheme only needs to be called once for every grid column where particles are present.
  ! Therefore, particles are sorted according to their grid position. Whenever a new grid
  ! cell is encountered by looping through the sorted particles, the convection scheme is called.
  !*****************************************************************************

  ! sort particles according to horizontal position and calculate index vector IPOINT

  call sort2(numpart,igrid,ipoint)

  ! Now visit all grid columns where particles are present
  ! by going through the sorted particles

  igrold = -1
  do kpart=1,numpart
    igr = igrid(kpart)
    if (igr .eq. -1) goto 50
    ipart = ipoint(kpart)
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  ! sumall = sumall + 1
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    if (igr .ne. igrold) then
  ! we are in a new grid column
      jy = (igr-1)/nx
      ix = igr - jy*nx - 1

  ! Interpolate all meteorological data needed for the convection scheme
      psconv=(ps(ix,jy,1,mind1)*dt2+ps(ix,jy,1,mind2)*dt1)*dtt
      tt2conv=(tt2(ix,jy,1,mind1)*dt2+tt2(ix,jy,1,mind2)*dt1)*dtt
      td2conv=(td2(ix,jy,1,mind1)*dt2+td2(ix,jy,1,mind2)*dt1)*dtt
!!$      do kz=1,nconvlev+1      !old
        do kz=1,nuvz-1           !bugfix
        tconv(kz)=(tth(ix,jy,kz+1,mind1)*dt2+ &
             tth(ix,jy,kz+1,mind2)*dt1)*dtt
        qconv(kz)=(qvh(ix,jy,kz+1,mind1)*dt2+ &
             qvh(ix,jy,kz+1,mind2)*dt1)*dtt
      end do

  ! Calculate translocation matrix
      call calcmatrix(lconv,delt,cbaseflux(ix,jy))
      igrold = igr
      ktop = 0
    endif

  ! treat particle only if column has convection
    if (lconv .eqv. .true.) then
  ! assign new vertical position to particle

      ztold=ztra1(ipart)
      call redist(ipart,ktop,ipconv)
  !    if (ipconv.le.0) sumconv = sumconv+1

  ! Calculate the gross fluxes across layer interfaces
  !***************************************************

      if (iflux.eq.1) then
        itage=abs(itra1(ipart)-itramem(ipart))
        do nage=1,nageclass
          if (itage.lt.lage(nage)) goto 37
        end do
 37     continue

        if (nage.le.nageclass) &
             call calcfluxes(nage,ipart,real(xtra1(ipart)), &
             real(ytra1(ipart)),ztold)
      endif

    endif   !(lconv .eqv. .true)
 50 continue
  end do


  !*****************************************************************************
  ! 2. Nested domains
  !*****************************************************************************

  ! sort particles according to horizontal position and calculate index vector IPOINT

  do inest=1,numbnests
    do ipart=1,numpart
      ipoint(ipart)=ipart
      igrid(ipart) = igridn(ipart,inest)
    enddo
    call sort2(numpart,igrid,ipoint)

  ! Now visit all grid columns where particles are present
  ! by going through the sorted particles

    igrold = -1
    do kpart=1,numpart
      igr = igrid(kpart)
      if (igr .eq. -1) goto 60
      ipart = ipoint(kpart)
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      ! sumall = sumall + 1
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      if (igr .ne. igrold) then
  ! we are in a new grid column
        jy = (igr-1)/nxn(inest)
        ix = igr - jy*nxn(inest) - 1

  ! Interpolate all meteorological data needed for the convection scheme
        psconv=(psn(ix,jy,1,mind1,inest)*dt2+ &
             psn(ix,jy,1,mind2,inest)*dt1)*dtt
        tt2conv=(tt2n(ix,jy,1,mind1,inest)*dt2+ &
             tt2n(ix,jy,1,mind2,inest)*dt1)*dtt
        td2conv=(td2n(ix,jy,1,mind1,inest)*dt2+ &
             td2n(ix,jy,1,mind2,inest)*dt1)*dtt
!!$        do kz=1,nconvlev+1    !old
        do kz=1,nuvz-1           !bugfix
          tconv(kz)=(tthn(ix,jy,kz+1,mind1,inest)*dt2+ &
               tthn(ix,jy,kz+1,mind2,inest)*dt1)*dtt
          qconv(kz)=(qvhn(ix,jy,kz+1,mind1,inest)*dt2+ &
               qvhn(ix,jy,kz+1,mind2,inest)*dt1)*dtt
        end do

  ! calculate translocation matrix
  !*******************************
        call calcmatrix(lconv,delt,cbasefluxn(ix,jy,inest))
        igrold = igr
        ktop = 0
      endif

  ! treat particle only if column has convection
      if (lconv .eqv. .true.) then
  ! assign new vertical position to particle
        ztold=ztra1(ipart)
        call redist(ipart,ktop,ipconv)
  !      if (ipconv.le.0) sumconv = sumconv+1

  ! Calculate the gross fluxes across layer interfaces
  !***************************************************

        if (iflux.eq.1) then
          itage=abs(itra1(ipart)-itramem(ipart))
          do nage=1,nageclass
            if (itage.lt.lage(nage)) goto 47
          end do
 47       continue

          if (nage.le.nageclass) &
               call calcfluxes(nage,ipart,real(xtra1(ipart)), &
               real(ytra1(ipart)),ztold)
        endif

      endif !(lconv .eqv. .true.)


60    continue
    end do
  end do
  !--------------------------------------------------------------------------
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  ! write(*,*)'############################################'
  ! write(*,*)'TIME=',&
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  !    &  itime
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  ! write(*,*)'fraction of particles under convection',&
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  !    &  sumconv/(sumall+0.001)
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  ! write(*,*)'total number of particles',&
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  !    &  sumall
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  ! write(*,*)'number of particles under convection',&
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  !    &  sumconv
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  ! write(*,*)'############################################'
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  return
end subroutine convmix