| 1 | !********************************************************************** |
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| 2 | ! Copyright 1998-2015 * |
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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 interpol_rain(yy1,yy2,yy3,nxmax,nymax,nzmax,nx,ny, & |
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| 23 | memind,xt,yt,level,itime1,itime2,itime,yint1,yint2,yint3, & |
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| 24 | icbot,ictop) |
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| 25 | ! i i i i i i i |
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| 26 | !i i i i i i i i o o o |
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| 27 | !**************************************************************************** |
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| 28 | ! * |
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| 29 | ! Interpolation of meteorological fields on 2-d model layers. * |
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| 30 | ! In horizontal direction bilinear interpolation interpolation is used. * |
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| 31 | ! Temporally a linear interpolation is used. * |
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| 32 | ! Three fields are interpolated at the same time. * |
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| 33 | ! * |
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| 34 | ! This is a special version of levlininterpol to save CPU time. * |
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| 35 | ! * |
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| 36 | ! 1 first time * |
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| 37 | ! 2 second time * |
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| 38 | ! * |
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| 39 | ! * |
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| 40 | ! Author: A. Stohl * |
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| 41 | ! * |
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| 42 | ! 30 August 1996 * |
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| 43 | !**************************************************************************** |
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| 44 | ! Petra Seibert, 2011/2012-2015: |
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| 45 | ! Add interpolation of cloud bottom and cloud thickness |
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| 46 | ! for fix to SE's new wet scavenging scheme |
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| 47 | ! * |
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| 48 | !**************************************************************************** |
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| 49 | ! * |
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| 50 | ! Variables: * |
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| 51 | ! * |
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| 52 | ! dt1,dt2 time differences between fields and current position * |
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| 53 | ! dz1,dz2 z distance between levels and current position * |
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| 54 | ! height(nzmax) heights of the model levels * |
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| 55 | ! indexh help variable * |
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| 56 | ! indz the level closest to the current trajectory position * |
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| 57 | ! indzh help variable * |
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| 58 | ! itime current time * |
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| 59 | ! itime1 time of the first wind field * |
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| 60 | ! itime2 time of the second wind field * |
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| 61 | ! ix,jy x,y coordinates of lower left subgrid point * |
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| 62 | ! level level at which interpolation shall be done * |
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| 63 | ! memind(3) points to the places of the wind fields * |
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| 64 | ! nx,ny actual field dimensions in x,y and z direction * |
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| 65 | ! nxmax,nymax,nzmax maximum field dimensions in x,y and z direction * |
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| 66 | ! xt current x coordinate * |
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| 67 | ! yint the final interpolated value * |
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| 68 | ! yt current y coordinate * |
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| 69 | ! yy(0:nxmax,0:nymax,nzmax,3) meteorological field used for interpolation * |
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| 70 | ! zt current z coordinate * |
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| 71 | ! * |
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| 72 | !**************************************************************************** |
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| 73 | |
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| 74 | use com_mod, only: icloudbot, icloudthck |
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| 75 | use par_mod, only: icmv |
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| 76 | |
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| 77 | implicit none |
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| 78 | |
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| 79 | integer :: nx,ny,nxmax,nymax,nzmax,memind(2),m,ix,jy,ixp,jyp |
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| 80 | integer :: itime,itime1,itime2,level,indexh,ip1,ip2,ip3,ip4 |
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| 81 | integer :: icbot,icthck,ictop,ipsum |
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| 82 | real :: yy1(0:nxmax-1,0:nymax-1,nzmax,2) |
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| 83 | real :: yy2(0:nxmax-1,0:nymax-1,nzmax,2) |
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| 84 | real :: yy3(0:nxmax-1,0:nymax-1,nzmax,2) |
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| 85 | real :: ddx,ddy,rddx,rddy,dt1,dt2,dt,y1(2),y2(2),y3(2),cbot(2),cthck(2) |
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| 86 | real :: xt,yt,yint1,yint2,yint3,p1,p2,p3,p4 |
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| 87 | |
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| 88 | |
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| 89 | ! If point at border of grid -> small displacement into grid |
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| 90 | !*********************************************************** |
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| 91 | |
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| 92 | if (xt.ge.real(nx-1)) xt=real(nx-1)-0.00001 |
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| 93 | if (yt.ge.real(ny-1)) yt=real(ny-1)-0.00001 |
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| 94 | |
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| 95 | |
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| 96 | |
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| 97 | !********************************************************************** |
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| 98 | ! 1.) Bilinear horizontal interpolation |
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| 99 | ! This has to be done separately for 2 fields (Temporal) |
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| 100 | !******************************************************* |
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| 101 | |
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| 102 | ! Determine the lower left corner and its distance to the current position |
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| 103 | !************************************************************************* |
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| 104 | |
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| 105 | ix=int(xt) |
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| 106 | jy=int(yt) |
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| 107 | ixp=ix+1 |
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| 108 | jyp=jy+1 |
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| 109 | ddx=xt-real(ix) |
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| 110 | ddy=yt-real(jy) |
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| 111 | rddx=1.-ddx |
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| 112 | rddy=1.-ddy |
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| 113 | p1=rddx*rddy |
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| 114 | p2=ddx*rddy |
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| 115 | p3=rddx*ddy |
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| 116 | p4=ddx*ddy |
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| 117 | |
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| 118 | |
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| 119 | ! Loop over 2 time steps |
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| 120 | !*********************** |
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| 121 | |
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| 122 | memind_loop: & |
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| 123 | do m=1,2 |
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| 124 | |
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| 125 | indexh=memind(m) |
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| 126 | |
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| 127 | y1(m)=p1*yy1(ix ,jy ,level,indexh) & |
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| 128 | + p2*yy1(ixp,jy ,level,indexh) & |
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| 129 | + p3*yy1(ix ,jyp,level,indexh) & |
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| 130 | + p4*yy1(ixp,jyp,level,indexh) |
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| 131 | y2(m)=p1*yy2(ix ,jy ,level,indexh) & |
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| 132 | + p2*yy2(ixp,jy ,level,indexh) & |
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| 133 | + p3*yy2(ix ,jyp,level,indexh) & |
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| 134 | + p4*yy2(ixp,jyp,level,indexh) |
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| 135 | y3(m)=p1*yy3(ix ,jy ,level,indexh) & |
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| 136 | + p2*yy3(ixp,jy ,level,indexh) & |
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| 137 | + p3*yy3(ix ,jyp,level,indexh) & |
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| 138 | + p4*yy3(ixp,jyp,level,indexh) |
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| 139 | |
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| 140 | |
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| 141 | ! PS clouds: |
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| 142 | ip1=1 |
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| 143 | ip2=1 |
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| 144 | ip3=1 |
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| 145 | ip4=1 |
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| 146 | if (icloudbot(ix ,jy ,indexh) .eq. icmv) ip1=0 |
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| 147 | if (icloudbot(ixp,jy ,indexh) .eq. icmv) ip2=0 |
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| 148 | if (icloudbot(ix ,jyp,indexh) .eq. icmv) ip3=0 |
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| 149 | if (icloudbot(ixp,jyp,indexh) .eq. icmv) ip4=0 |
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| 150 | ipsum = ip1+ip2+ip3+ip4 |
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| 151 | if (ipsum .eq. 0) then |
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| 152 | cbot(m)=icmv |
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| 153 | else |
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| 154 | cbot(m)=(ip1*p1*icloudbot(ix ,jy ,indexh) & |
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| 155 | + ip2*p2*icloudbot(ixp,jy ,indexh) & |
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| 156 | + ip3*p3*icloudbot(ix ,jyp,indexh) & |
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| 157 | + ip4*p4*icloudbot(ixp,jyp,indexh)) / ipsum |
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| 158 | endif |
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| 159 | |
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| 160 | ip1=1 |
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| 161 | ip2=1 |
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| 162 | ip3=1 |
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| 163 | ip4=1 |
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| 164 | if (icloudthck(ix ,jy ,indexh) .eq. icmv) ip1=0 |
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| 165 | if (icloudthck(ixp,jy ,indexh) .eq. icmv) ip2=0 |
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| 166 | if (icloudthck(ix ,jyp,indexh) .eq. icmv) ip3=0 |
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| 167 | if (icloudthck(ixp,jyp,indexh) .eq. icmv) ip4=0 |
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| 168 | ipsum = ip1+ip2+ip3+ip4 |
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| 169 | if (ipsum .eq. 0) then |
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| 170 | cthck(m)=icmv |
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| 171 | else |
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| 172 | cthck(m)=(ip1*p1*icloudthck(ix ,jy ,indexh) & |
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| 173 | + ip2*p2*icloudthck(ixp,jy ,indexh) & |
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| 174 | + ip3*p3*icloudthck(ix ,jyp,indexh) & |
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| 175 | + ip4*p4*icloudthck(ixp,jyp,indexh)) / ipsum |
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| 176 | endif |
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| 177 | ! PS end clouds |
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| 178 | |
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| 179 | enddo memind_loop |
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| 180 | |
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| 181 | |
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| 182 | !************************************ |
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| 183 | ! 2.) Temporal interpolation (linear) |
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| 184 | !************************************ |
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| 185 | |
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| 186 | dt1=real(itime-itime1) |
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| 187 | dt2=real(itime2-itime) |
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| 188 | dt=dt1+dt2 |
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| 189 | |
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| 190 | yint1=(y1(1)*dt2+y1(2)*dt1)/dt |
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| 191 | yint2=(y2(1)*dt2+y2(2)*dt1)/dt |
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| 192 | yint3=(y3(1)*dt2+y3(2)*dt1)/dt |
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| 193 | |
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| 194 | ! PS clouds: |
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| 195 | icbot = nint( (cbot(1)*dt2 + cbot(2)*dt1)/dt ) |
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| 196 | if (nint(cbot(1)) .eq. icmv) icbot=cbot(2) |
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| 197 | if (nint(cbot(2)) .eq. icmv) icbot=cbot(1) |
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| 198 | |
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| 199 | icthck = nint( (cthck(1)*dt2 + cthck(2)*dt1)/dt ) |
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| 200 | if (nint(cthck(1)) .eq. icmv) icthck=cthck(2) |
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| 201 | if (nint(cthck(2)) .eq. icmv) icthck=cthck(1) |
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| 202 | |
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| 203 | if (icbot .ne. icmv .and. icthck .ne. icmv) then |
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| 204 | ictop = icbot + icthck ! convert cloud thickness to cloud top |
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| 205 | else |
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| 206 | icbot=icmv |
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| 207 | ictop=icmv |
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| 208 | endif |
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| 209 | ! PS end clouds |
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| 210 | |
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| 211 | |
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| 212 | end subroutine interpol_rain |
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