1 | !********************************************************************** |
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2 | ! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010 * |
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3 | ! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa, * |
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4 | ! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann * |
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5 | ! * |
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6 | ! This file is part of FLEXPART. * |
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7 | ! * |
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8 | ! FLEXPART is free software: you can redistribute it and/or modify * |
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9 | ! it under the terms of the GNU General Public License as published by* |
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10 | ! the Free Software Foundation, either version 3 of the License, or * |
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11 | ! (at your option) any later version. * |
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12 | ! * |
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13 | ! FLEXPART is distributed in the hope that it will be useful, * |
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14 | ! but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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15 | ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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16 | ! GNU General Public License for more details. * |
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17 | ! * |
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18 | ! You should have received a copy of the GNU General Public License * |
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19 | ! along with FLEXPART. If not, see <http://www.gnu.org/licenses/>. * |
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20 | !********************************************************************** |
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21 | |
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22 | subroutine shift_field(field,nxf,nyf,nzfmax,nzf,nmax,n) |
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23 | ! i/o i i i i i i |
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24 | !***************************************************************************** |
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25 | ! * |
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26 | ! This subroutine shifts global fields by nxshift grid cells, in order to * |
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27 | ! facilitate all sorts of nested wind fields, or output grids, which, * |
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28 | ! without shifting, would overlap with the domain "boundary". * |
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29 | ! * |
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30 | ! Author: A. Stohl * |
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31 | ! * |
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32 | ! 3 July 2002 * |
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33 | ! * |
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34 | !***************************************************************************** |
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35 | ! * |
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36 | ! Variables: * |
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37 | ! * |
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38 | ! Constants: * |
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39 | ! * |
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40 | !***************************************************************************** |
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41 | |
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42 | use par_mod |
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43 | |
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44 | implicit none |
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45 | |
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46 | integer :: nxf,nyf,nzf,n,ix,jy,kz,ixs,nzfmax,nmax |
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47 | real :: field(0:nxmax-1,0:nymax-1,nzfmax,nmax),xshiftaux(0:nxmax-1) |
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48 | |
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49 | ! Loop over y and z |
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50 | !****************** |
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51 | |
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52 | do kz=1,nzf |
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53 | do jy=0,nyf-1 |
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54 | |
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55 | ! Shift the data |
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56 | !*************** |
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57 | |
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58 | if (nxshift.ne.0) then |
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59 | do ix=0,nxf-1 |
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60 | if (ix.ge.nxshift) then |
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61 | ixs=ix-nxshift |
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62 | else |
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63 | ixs=nxf-nxshift+ix |
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64 | endif |
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65 | xshiftaux(ixs)=field(ix,jy,kz,n) |
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66 | end do |
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67 | do ix=0,nxf-1 |
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68 | field(ix,jy,kz,n)=xshiftaux(ix) |
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69 | end do |
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70 | endif |
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71 | |
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72 | ! Repeat the westernmost grid cells at the easternmost domain "boundary" |
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73 | !*********************************************************************** |
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74 | |
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75 | field(nxf,jy,kz,n)=field(0,jy,kz,n) |
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76 | end do |
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77 | end do |
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78 | |
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79 | end subroutine shift_field |
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