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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 shift_field(field,nxf,nyf,nzfmax,nzf,nmax,n)
! i/o i i i i i i
!*****************************************************************************
! *
! This subroutine shifts global fields by nxshift grid cells, in order to *
! facilitate all sorts of nested wind fields, or output grids, which, *
! without shifting, would overlap with the domain "boundary". *
! *
! Author: A. Stohl *
! *
! 3 July 2002 *
! *
!*****************************************************************************
! *
! Variables: *
! *
! Constants: *
! *
!*****************************************************************************
use par_mod
implicit none
integer :: nxf,nyf,nzf,n,ix,jy,kz,ixs,nzfmax,nmax
real :: field(0:nxmax-1,0:nymax-1,nzfmax,nmax),xshiftaux(0:nxmax-1)
! Loop over y and z
!******************
do kz=1,nzf
do jy=0,nyf-1
! Shift the data
!***************
if (nxshift.ne.0) then
do ix=0,nxf-1
if (ix.ge.nxshift) then
ixs=ix-nxshift
else
ixs=nxf-nxshift+ix
endif
xshiftaux(ixs)=field(ix,jy,kz,n)
end do
do ix=0,nxf-1
field(ix,jy,kz,n)=xshiftaux(ix)
end do
endif
! Repeat the westernmost grid cells at the easternmost domain "boundary"
!***********************************************************************
field(nxf,jy,kz,n)=field(0,jy,kz,n)
end do
end do
end subroutine shift_field
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