source: flexpart.git/src/concoutput_surf_nest.f90 @ 2eefa58

!**********************************************************************
! 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 concoutput_surf_nest(itime,outnum)
  !                        i     i
  !*****************************************************************************
  !                                                                            *
  !     Output of the concentration grid and the receptor concentrations.      *
  !                                                                            *
  !     Author: A. Stohl                                                       *
  !                                                                            *
  !     24 May 1995                                                            *
  !                                                                            *
  !     13 April 1999, Major update: if output size is smaller, dump output    *
  !                    in sparse matrix format; additional output of           *
  !                    uncertainty                                             *
  !                                                                            *
  !     05 April 2000, Major update: output of age classes; output for backward*
  !                    runs is time spent in grid cell times total mass of     *
  !                    species.                                                *
  !                                                                            *
  !     17 February 2002, Appropriate dimensions for backward and forward runs *
  !                       are now specified in file par_mod                    *
  !                                                                            *
  !     June 2006, write grid in sparse matrix with a single write command     *
  !                in order to save disk space                                 *
  !                                                                            *
  !     2008 new sparse matrix format                                          *
  !                                                                            *
  !*****************************************************************************
  !                                                                            *
  ! Variables:                                                                 *
  ! outnum          number of samples                                          *
  ! ncells          number of cells with non-zero concentrations               *
  ! sparse          .true. if in sparse matrix format, else .false.            *
  ! tot_mu          1 for forward, initial mass mixing ration for backw. runs  *
  !                                                                            *
  !*****************************************************************************

  use unc_mod
  use point_mod
  use outg_mod
  use par_mod
  use com_mod
  use mean_mod

  implicit none

  real(kind=dp) :: jul
  integer :: itime,i,ix,jy,kz,ks,kp,l,iix,jjy,kzz,nage,jjjjmmdd,ihmmss
  integer :: sp_count_i,sp_count_r
  real :: sp_fact
  real :: outnum,densityoutrecept(maxreceptor),xl,yl
! RLT
  real :: densitydryrecept(maxreceptor)
  real :: factor_dryrecept(maxreceptor)

  !real densityoutgrid(0:numxgrid-1,0:numygrid-1,numzgrid),
  !    +grid(0:numxgrid-1,0:numygrid-1,numzgrid,maxspec,maxpointspec_act,
  !    +    maxageclass)
  !real wetgrid(0:numxgrid-1,0:numygrid-1,maxspec,maxpointspec_act,
  !    +       maxageclass)
  !real drygrid(0:numxgrid-1,0:numygrid-1,maxspec,
  !    +       maxpointspec_act,maxageclass)
  !real gridsigma(0:numxgrid-1,0:numygrid-1,numzgrid,maxspec,
  !    +       maxpointspec_act,maxageclass),
  !    +     drygridsigma(0:numxgrid-1,0:numygrid-1,maxspec,
  !    +     maxpointspec_act,maxageclass),
  !    +     wetgridsigma(0:numxgrid-1,0:numygrid-1,maxspec,
  !    +     maxpointspec_act,maxageclass)
  !real factor(0:numxgrid-1,0:numygrid-1,numzgrid)
  !real sparse_dump_r(numxgrid*numygrid*numzgrid)
  !integer sparse_dump_i(numxgrid*numygrid*numzgrid)

  !real sparse_dump_u(numxgrid*numygrid*numzgrid)
  real(dep_prec) :: auxgrid(nclassunc)
  real :: halfheight,dz,dz1,dz2,tot_mu(maxspec,maxpointspec_act)
  real,parameter :: smallnum = tiny(0.0) ! smallest number that can be handled
  real,parameter :: weightair=28.97
  logical :: sp_zer
  character :: adate*8,atime*6
  character(len=3) :: anspec
  logical :: lexist

  ! Determine current calendar date, needed for the file name
  !**********************************************************

  jul=bdate+real(itime,kind=dp)/86400._dp
  call caldate(jul,jjjjmmdd,ihmmss)
  write(adate,'(i8.8)') jjjjmmdd
  write(atime,'(i6.6)') ihmmss


  ! For forward simulations, output fields have dimension MAXSPEC,
  ! for backward simulations, output fields have dimension MAXPOINT.
  ! Thus, make loops either about nspec, or about numpoint
  !*****************************************************************


    if (ldirect.eq.1) then
       do ks=1,nspec
         do kp=1,maxpointspec_act
           tot_mu(ks,kp)=1
         end do
       end do
   else
      do ks=1,nspec
             do kp=1,maxpointspec_act
               tot_mu(ks,kp)=xmass(kp,ks)
             end do
      end do
    endif


  !*******************************************************************
  ! Compute air density: sufficiently accurate to take it
  ! from coarse grid at some time
  ! Determine center altitude of output layer, and interpolate density
  ! data to that altitude
  !*******************************************************************

  do kz=1,numzgrid
    if (kz.eq.1) then
      halfheight=outheight(1)/2.
    else
      halfheight=(outheight(kz)+outheight(kz-1))/2.
    endif
    do kzz=2,nz
      if ((height(kzz-1).lt.halfheight).and. &
           (height(kzz).gt.halfheight)) goto 46
    end do
46   kzz=max(min(kzz,nz),2)
    dz1=halfheight-height(kzz-1)
    dz2=height(kzz)-halfheight
    dz=dz1+dz2
    do jy=0,numygridn-1
      do ix=0,numxgridn-1
        xl=outlon0n+real(ix)*dxoutn
        yl=outlat0n+real(jy)*dyoutn
        xl=(xl-xlon0)/dx
        yl=(yl-ylat0)/dy
        iix=max(min(nint(xl),nxmin1),0)
        jjy=max(min(nint(yl),nymin1),0)
        densityoutgrid(ix,jy,kz)=(rho(iix,jjy,kzz,2)*dz1+ &
             rho(iix,jjy,kzz-1,2)*dz2)/dz
! RLT
        densitydrygrid(ix,jy,kz)=(rho_dry(iix,jjy,kzz,2)*dz1+ &
             rho_dry(iix,jjy,kzz-1,2)*dz2)/dz
      end do
    end do
  end do

    do i=1,numreceptor
      xl=xreceptor(i)
      yl=yreceptor(i)
      iix=max(min(nint(xl),nxmin1),0)
      jjy=max(min(nint(yl),nymin1),0)
      densityoutrecept(i)=rho(iix,jjy,1,2)
! RLT
    densitydryrecept(i)=rho_dry(iix,jjy,1,2)
    end do

! RLT
! conversion factor for output relative to dry air
  factor_drygrid=densityoutgrid/densitydrygrid
  factor_dryrecept=densityoutrecept/densitydryrecept

  ! Output is different for forward and backward simulations
    do kz=1,numzgrid
      do jy=0,numygridn-1
        do ix=0,numxgridn-1
          if (ldirect.eq.1) then
            factor3d(ix,jy,kz)=1.e12/volumen(ix,jy,kz)/outnum
          else
            factor3d(ix,jy,kz)=real(abs(loutaver))/outnum
          endif
        end do
      end do
    end do

  !*********************************************************************
  ! Determine the standard deviation of the mean concentration or mixing
  ! ratio (uncertainty of the output) and the dry and wet deposition
  !*********************************************************************

  do ks=1,nspec

  write(anspec,'(i3.3)') ks
  if ((iout.eq.1).or.(iout.eq.3).or.(iout.eq.5)) then
    if (ldirect.eq.1) then
      open(unitoutgrid,file=path(2)(1:length(2))//'grid_conc_nest_' &
           //adate// &
           atime//'_'//anspec,form='unformatted')
    else
      open(unitoutgrid,file=path(2)(1:length(2))//'grid_time_nest_' &
           //adate// &
           atime//'_'//anspec,form='unformatted')
    endif
     write(unitoutgrid) itime
   endif

  if ((iout.eq.2).or.(iout.eq.3)) then      ! mixing ratio
   open(unitoutgridppt,file=path(2)(1:length(2))//'grid_pptv_nest_' &
        //adate// &
        atime//'_'//anspec,form='unformatted')

    write(unitoutgridppt) itime
  endif

  do kp=1,maxpointspec_act
  do nage=1,nageclass

    do jy=0,numygridn-1
      do ix=0,numxgridn-1

  ! WET DEPOSITION
        if ((WETDEP).and.(ldirect.gt.0)) then
            do l=1,nclassunc
              auxgrid(l)=wetgriduncn(ix,jy,ks,kp,l,nage)
            end do
            call mean(auxgrid,wetgrid(ix,jy), &
                 wetgridsigma(ix,jy),nclassunc)
  ! Multiply by number of classes to get total concentration
            wetgrid(ix,jy)=wetgrid(ix,jy) &
                 *nclassunc
  ! Calculate standard deviation of the mean
            wetgridsigma(ix,jy)= &
                 wetgridsigma(ix,jy)* &
                 sqrt(real(nclassunc))
        endif

  ! DRY DEPOSITION
        if ((DRYDEP).and.(ldirect.gt.0)) then
            do l=1,nclassunc
              auxgrid(l)=drygriduncn(ix,jy,ks,kp,l,nage)
            end do
            call mean(auxgrid,drygrid(ix,jy), &
                 drygridsigma(ix,jy),nclassunc)
  ! Multiply by number of classes to get total concentration
            drygrid(ix,jy)=drygrid(ix,jy)* &
                 nclassunc
  ! Calculate standard deviation of the mean
            drygridsigma(ix,jy)= &
                 drygridsigma(ix,jy)* &
                 sqrt(real(nclassunc))
        endif

  ! CONCENTRATION OR MIXING RATIO
        do kz=1,numzgrid
            do l=1,nclassunc
              auxgrid(l)=griduncn(ix,jy,kz,ks,kp,l,nage)
            end do
            call mean(auxgrid,grid(ix,jy,kz), &
                 gridsigma(ix,jy,kz),nclassunc)
  ! Multiply by number of classes to get total concentration
            grid(ix,jy,kz)= &
                 grid(ix,jy,kz)*nclassunc
  ! Calculate standard deviation of the mean
            gridsigma(ix,jy,kz)= &
                 gridsigma(ix,jy,kz)* &
                 sqrt(real(nclassunc))
        end do
      end do
    end do


  !*******************************************************************
  ! Generate output: may be in concentration (ng/m3) or in mixing
  ! ratio (ppt) or both
  ! Output the position and the values alternated multiplied by
  ! 1 or -1, first line is number of values, number of positions
  ! For backward simulations, the unit is seconds, stored in grid_time
  !*******************************************************************

  ! Concentration output
  !*********************
  if ((iout.eq.1).or.(iout.eq.3).or.(iout.eq.5)) then

  ! Wet deposition
         sp_count_i=0
         sp_count_r=0
         sp_fact=-1.
         sp_zer=.true.
         if ((ldirect.eq.1).and.(WETDEP)) then
         do jy=0,numygridn-1
            do ix=0,numxgridn-1
  !oncentraion greater zero
              if (wetgrid(ix,jy).gt.smallnum) then
                 if (sp_zer.eqv..true.) then ! first non zero value
                    sp_count_i=sp_count_i+1
                    sparse_dump_i(sp_count_i)=ix+jy*numxgridn
                    sp_zer=.false.
                    sp_fact=sp_fact*(-1.)
                 endif
                 sp_count_r=sp_count_r+1
                 sparse_dump_r(sp_count_r)= &
                      sp_fact*1.e12*wetgrid(ix,jy)/arean(ix,jy)
                 sparse_dump_u(sp_count_r)= &
                      1.e12*wetgridsigma(ix,jy)/area(ix,jy)
              else ! concentration is zero
                  sp_zer=.true.
              endif
            end do
         end do
         else
            sp_count_i=0
            sp_count_r=0
         endif
         write(unitoutgrid) sp_count_i
         write(unitoutgrid) (sparse_dump_i(i),i=1,sp_count_i)
         write(unitoutgrid) sp_count_r
         write(unitoutgrid) (sparse_dump_r(i),i=1,sp_count_r)
!         write(unitoutgrid) sp_count_r
!         write(unitoutgrid) (sparse_dump_u(i),i=1,sp_count_r)

  ! Dry deposition
         sp_count_i=0
         sp_count_r=0
         sp_fact=-1.
         sp_zer=.true.
         if ((ldirect.eq.1).and.(DRYDEP)) then
          do jy=0,numygridn-1
            do ix=0,numxgridn-1
              if (drygrid(ix,jy).gt.smallnum) then
                 if (sp_zer.eqv..true.) then ! first non zero value
                    sp_count_i=sp_count_i+1
                    sparse_dump_i(sp_count_i)=ix+jy*numxgridn
                    sp_zer=.false.
                    sp_fact=sp_fact*(-1.)
                 endif
                 sp_count_r=sp_count_r+1
                 sparse_dump_r(sp_count_r)= &
                      sp_fact* &
                      1.e12*drygrid(ix,jy)/arean(ix,jy)
                 sparse_dump_u(sp_count_r)= &
                      1.e12*drygridsigma(ix,jy)/area(ix,jy)
              else ! concentration is zero
                  sp_zer=.true.
              endif
            end do
          end do
         else
            sp_count_i=0
            sp_count_r=0
         endif
         write(unitoutgrid) sp_count_i
         write(unitoutgrid) (sparse_dump_i(i),i=1,sp_count_i)
         write(unitoutgrid) sp_count_r
         write(unitoutgrid) (sparse_dump_r(i),i=1,sp_count_r)
!         write(unitoutgrid) sp_count_r
!         write(unitoutgrid) (sparse_dump_u(i),i=1,sp_count_r)



  ! Concentrations

  ! if surf_only write only 1st layer 

         if(surf_only.eq.1) then
         sp_count_i=0
         sp_count_r=0
         sp_fact=-1.
         sp_zer=.true.
          do kz=1,1
            do jy=0,numygridn-1
              do ix=0,numxgridn-1
                if (grid(ix,jy,kz).gt.smallnum) then
                  if (sp_zer.eqv..true.) then ! first non zero value
                    sp_count_i=sp_count_i+1
                    sparse_dump_i(sp_count_i)= &
                         ix+jy*numxgridn+kz*numxgridn*numygridn
                    sp_zer=.false.
                    sp_fact=sp_fact*(-1.)
                   endif
                   sp_count_r=sp_count_r+1
                   sparse_dump_r(sp_count_r)= &
                        sp_fact* &
                        grid(ix,jy,kz)* &
                        factor3d(ix,jy,kz)/tot_mu(ks,kp)
  !                 if ((factor(ix,jy,kz)/tot_mu(ks,kp)).eq.0)
  !    +              write (*,*) factor(ix,jy,kz),tot_mu(ks,kp),ks,kp
                   sparse_dump_u(sp_count_r)= &
                        gridsigma(ix,jy,kz)* &
                        factor3d(ix,jy,kz)/tot_mu(ks,kp)
              else ! concentration is zero
                  sp_zer=.true.
              endif
              end do
            end do
          end do
         write(unitoutgrid) sp_count_i
         write(unitoutgrid) (sparse_dump_i(i),i=1,sp_count_i)
         write(unitoutgrid) sp_count_r
         write(unitoutgrid) (sparse_dump_r(i),i=1,sp_count_r)
!         write(unitoutgrid) sp_count_r
!         write(unitoutgrid) (sparse_dump_u(i),i=1,sp_count_r)
         else

  ! write full vertical resolution

         sp_count_i=0
         sp_count_r=0
         sp_fact=-1.
         sp_zer=.true.
          do kz=1,numzgrid
            do jy=0,numygridn-1
              do ix=0,numxgridn-1
                if (grid(ix,jy,kz).gt.smallnum) then
                  if (sp_zer.eqv..true.) then ! first non zero value
                    sp_count_i=sp_count_i+1
                    sparse_dump_i(sp_count_i)= &
                         ix+jy*numxgridn+kz*numxgridn*numygridn
                    sp_zer=.false.
                    sp_fact=sp_fact*(-1.)
                   endif
                   sp_count_r=sp_count_r+1
                   sparse_dump_r(sp_count_r)= &
                        sp_fact* &
                        grid(ix,jy,kz)* &
                        factor3d(ix,jy,kz)/tot_mu(ks,kp)
  !                 if ((factor(ix,jy,kz)/tot_mu(ks,kp)).eq.0)
  !    +              write (*,*) factor(ix,jy,kz),tot_mu(ks,kp),ks,kp
                   sparse_dump_u(sp_count_r)= &
                        gridsigma(ix,jy,kz)* &
                        factor3d(ix,jy,kz)/tot_mu(ks,kp)
              else ! concentration is zero
                  sp_zer=.true.
              endif
              end do
            end do
          end do
         write(unitoutgrid) sp_count_i
         write(unitoutgrid) (sparse_dump_i(i),i=1,sp_count_i)
         write(unitoutgrid) sp_count_r
         write(unitoutgrid) (sparse_dump_r(i),i=1,sp_count_r)
!         write(unitoutgrid) sp_count_r
!         write(unitoutgrid) (sparse_dump_u(i),i=1,sp_count_r)
         endif ! surf_only


    endif !  concentration output

  ! Mixing ratio output
  !********************

  if ((iout.eq.2).or.(iout.eq.3)) then      ! mixing ratio

  ! Wet deposition
         sp_count_i=0
         sp_count_r=0
         sp_fact=-1.
         sp_zer=.true.
         if ((ldirect.eq.1).and.(WETDEP)) then
          do jy=0,numygridn-1
            do ix=0,numxgridn-1
                if (wetgrid(ix,jy).gt.smallnum) then
                  if (sp_zer.eqv..true.) then ! first non zero value
                    sp_count_i=sp_count_i+1
                    sparse_dump_i(sp_count_i)= &
                         ix+jy*numxgridn
                    sp_zer=.false.
                    sp_fact=sp_fact*(-1.)
                 endif
                 sp_count_r=sp_count_r+1
                 sparse_dump_r(sp_count_r)= &
                      sp_fact* &
                      1.e12*wetgrid(ix,jy)/arean(ix,jy)
                 sparse_dump_u(sp_count_r)= &
                      1.e12*wetgridsigma(ix,jy)/area(ix,jy)
              else ! concentration is zero
                  sp_zer=.true.
              endif
            end do
          end do
         else
           sp_count_i=0
           sp_count_r=0
         endif
         write(unitoutgridppt) sp_count_i
         write(unitoutgridppt) (sparse_dump_i(i),i=1,sp_count_i)
         write(unitoutgridppt) sp_count_r
         write(unitoutgridppt) (sparse_dump_r(i),i=1,sp_count_r)
!         write(unitoutgridppt) sp_count_r
!         write(unitoutgridppt) (sparse_dump_u(i),i=1,sp_count_r)


  ! Dry deposition
         sp_count_i=0
         sp_count_r=0
         sp_fact=-1.
         sp_zer=.true.
         if ((ldirect.eq.1).and.(DRYDEP)) then
          do jy=0,numygridn-1
            do ix=0,numxgridn-1
                if (drygrid(ix,jy).gt.smallnum) then
                  if (sp_zer.eqv..true.) then ! first non zero value
                    sp_count_i=sp_count_i+1
                    sparse_dump_i(sp_count_i)= &
                         ix+jy*numxgridn
                    sp_zer=.false.
                    sp_fact=sp_fact*(-1)
                 endif
                 sp_count_r=sp_count_r+1
                 sparse_dump_r(sp_count_r)= &
                      sp_fact* &
                      1.e12*drygrid(ix,jy)/arean(ix,jy)
                 sparse_dump_u(sp_count_r)= &
                      1.e12*drygridsigma(ix,jy)/area(ix,jy)
              else ! concentration is zero
                  sp_zer=.true.
              endif
            end do
          end do
         else
           sp_count_i=0
           sp_count_r=0
         endif
         write(unitoutgridppt) sp_count_i
         write(unitoutgridppt) (sparse_dump_i(i),i=1,sp_count_i)
         write(unitoutgridppt) sp_count_r
         write(unitoutgridppt) (sparse_dump_r(i),i=1,sp_count_r)
!         write(unitoutgridppt) sp_count_r
!         write(unitoutgridppt) (sparse_dump_u(i),i=1,sp_count_r)


  ! Mixing ratios

    ! if surf_only write only 1st layer 

         if(surf_only.eq.1) then
         sp_count_i=0
         sp_count_r=0
         sp_fact=-1.
         sp_zer=.true.
          do kz=1,1
            do jy=0,numygridn-1
              do ix=0,numxgridn-1
                if (grid(ix,jy,kz).gt.smallnum) then
                  if (sp_zer.eqv..true.) then ! first non zero value
                    sp_count_i=sp_count_i+1
                    sparse_dump_i(sp_count_i)= &
                         ix+jy*numxgridn+kz*numxgridn*numygridn
                    sp_zer=.false.
                    sp_fact=sp_fact*(-1.)
                 endif
                 sp_count_r=sp_count_r+1
                 sparse_dump_r(sp_count_r)= &
                      sp_fact* &
                      1.e12*grid(ix,jy,kz) &
                      /volumen(ix,jy,kz)/outnum* &
                      weightair/weightmolar(ks)/densityoutgrid(ix,jy,kz)
                 sparse_dump_u(sp_count_r)= &
                      1.e12*gridsigma(ix,jy,kz)/volumen(ix,jy,kz)/ &
                      outnum*weightair/weightmolar(ks)/ &
                      densityoutgrid(ix,jy,kz)
              else ! concentration is zero
                  sp_zer=.true.
              endif
              end do
            end do
          end do
         write(unitoutgridppt) sp_count_i
         write(unitoutgridppt) (sparse_dump_i(i),i=1,sp_count_i)
         write(unitoutgridppt) sp_count_r
         write(unitoutgridppt) (sparse_dump_r(i),i=1,sp_count_r)
!         write(unitoutgridppt) sp_count_r
!         write(unitoutgridppt) (sparse_dump_u(i),i=1,sp_count_r)
         else

  ! write full vertical resolution

         sp_count_i=0
         sp_count_r=0
         sp_fact=-1.
         sp_zer=.true.
          do kz=1,numzgrid
            do jy=0,numygridn-1
              do ix=0,numxgridn-1
                if (grid(ix,jy,kz).gt.smallnum) then
                  if (sp_zer.eqv..true.) then ! first non zero value
                    sp_count_i=sp_count_i+1
                    sparse_dump_i(sp_count_i)= &
                         ix+jy*numxgridn+kz*numxgridn*numygridn
                    sp_zer=.false.
                    sp_fact=sp_fact*(-1.)
                 endif
                 sp_count_r=sp_count_r+1
                 sparse_dump_r(sp_count_r)= &
                      sp_fact* &
                      1.e12*grid(ix,jy,kz) &
                      /volumen(ix,jy,kz)/outnum* &
                      weightair/weightmolar(ks)/densityoutgrid(ix,jy,kz)
                 sparse_dump_u(sp_count_r)= &
                      1.e12*gridsigma(ix,jy,kz)/volumen(ix,jy,kz)/ &
                      outnum*weightair/weightmolar(ks)/ &
                      densityoutgrid(ix,jy,kz)
              else ! concentration is zero
                  sp_zer=.true.
              endif
              end do
            end do
          end do
         write(unitoutgridppt) sp_count_i
         write(unitoutgridppt) (sparse_dump_i(i),i=1,sp_count_i)
         write(unitoutgridppt) sp_count_r
         write(unitoutgridppt) (sparse_dump_r(i),i=1,sp_count_r)
!         write(unitoutgridppt) sp_count_r
!         write(unitoutgridppt) (sparse_dump_u(i),i=1,sp_count_r)
         endif ! surf_only

      endif ! output for ppt

  end do
  end do

    close(unitoutgridppt)
    close(unitoutgrid)

  end do

! RLT Aug 2017
! Write out conversion factor for dry air
  inquire(file=path(2)(1:length(2))//'factor_drygrid_nest',exist=lexist)
  if (lexist) then
    ! open and append
    open(unitoutfactor,file=path(2)(1:length(2))//'factor_drygrid_nest',form='unformatted',&
            status='old',action='write',access='append')
  else
    ! create new
    open(unitoutfactor,file=path(2)(1:length(2))//'factor_drygrid_nest',form='unformatted',&
            status='new',action='write')
  endif
  sp_count_i=0
  sp_count_r=0
  sp_fact=-1.
  sp_zer=.true.
  do kz=1,1
    do jy=0,numygridn-1
      do ix=0,numxgridn-1
        if (factor_drygrid(ix,jy,kz).gt.(1.+smallnum).or.factor_drygrid(ix,jy,kz).lt.(1.-smallnum)) then
          if (sp_zer.eqv..true.) then ! first value not equal to one
            sp_count_i=sp_count_i+1
            sparse_dump_i(sp_count_i)= &
                  ix+jy*numxgridn+kz*numxgridn*numygridn
            sp_zer=.false.
            sp_fact=sp_fact*(-1.)
          endif
          sp_count_r=sp_count_r+1
          sparse_dump_r(sp_count_r)= &
               sp_fact*factor_drygrid(ix,jy,kz)
        else ! factor is one
          sp_zer=.true.
        endif
      end do
    end do
  end do
  write(unitoutfactor) sp_count_i
  write(unitoutfactor) (sparse_dump_i(i),i=1,sp_count_i)
  write(unitoutfactor) sp_count_r
  write(unitoutfactor) (sparse_dump_r(i),i=1,sp_count_r)
  close(unitoutfactor)



  ! Reinitialization of grid
  !*************************

  do ks=1,nspec
  do kp=1,maxpointspec_act
    do i=1,numreceptor
      creceptor(i,ks)=0.
    end do
    do jy=0,numygridn-1
      do ix=0,numxgridn-1
        do l=1,nclassunc
          do nage=1,nageclass
            do kz=1,numzgrid
              griduncn(ix,jy,kz,ks,kp,l,nage)=0.
            end do
          end do
        end do
      end do
    end do
  end do
  end do


end subroutine concoutput_surf_nest