1 | ! SPDX-FileCopyrightText: FLEXPART 1998-2019, see flexpart_license.txt |
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2 | ! SPDX-License-Identifier: GPL-3.0-or-later |
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3 | |
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4 | subroutine shift_field(field,nxf,nyf,nzfmax,nzf,nmax,n) |
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5 | ! i/o i i i i i i |
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6 | !***************************************************************************** |
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7 | ! * |
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8 | ! This subroutine shifts global fields by nxshift grid cells, in order to * |
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9 | ! facilitate all sorts of nested wind fields, or output grids, which, * |
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10 | ! without shifting, would overlap with the domain "boundary". * |
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11 | ! * |
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12 | ! Author: A. Stohl * |
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13 | ! * |
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14 | ! 3 July 2002 * |
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15 | ! * |
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16 | !***************************************************************************** |
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17 | ! * |
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18 | ! Variables: * |
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19 | ! * |
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20 | ! Constants: * |
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21 | ! * |
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22 | !***************************************************************************** |
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23 | |
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24 | use par_mod |
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25 | |
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26 | implicit none |
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27 | |
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28 | integer :: nxf,nyf,nzf,n,ix,jy,kz,ixs,nzfmax,nmax |
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29 | real :: field(0:nxmax-1,0:nymax-1,nzfmax,nmax),xshiftaux(0:nxmax-1) |
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30 | |
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31 | ! Loop over y and z |
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32 | !****************** |
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33 | |
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34 | do kz=1,nzf |
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35 | do jy=0,nyf-1 |
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36 | |
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37 | ! Shift the data |
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38 | !*************** |
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39 | |
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40 | if (nxshift.ne.0) then |
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41 | do ix=0,nxf-1 |
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42 | if (ix.ge.nxshift) then |
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43 | ixs=ix-nxshift |
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44 | else |
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45 | ixs=nxf-nxshift+ix |
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46 | endif |
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47 | xshiftaux(ixs)=field(ix,jy,kz,n) |
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48 | end do |
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49 | do ix=0,nxf-1 |
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50 | field(ix,jy,kz,n)=xshiftaux(ix) |
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51 | end do |
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52 | endif |
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53 | |
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54 | ! Repeat the westernmost grid cells at the easternmost domain "boundary" |
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55 | !*********************************************************************** |
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56 | |
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57 | field(nxf,jy,kz,n)=field(0,jy,kz,n) |
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58 | end do |
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59 | end do |
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60 | |
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61 | end subroutine shift_field |
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