[92fab65] | 1 | ! SPDX-FileCopyrightText: FLEXPART 1998-2019, see flexpart_license.txt |
---|
| 2 | ! SPDX-License-Identifier: GPL-3.0-or-later |
---|
[332fbbd] | 3 | |
---|
[e200b7a] | 4 | subroutine interpol_rain_nests(yy1,yy2,yy3,nxmaxn,nymaxn,nzmax, & |
---|
[0ecc1fe] | 5 | maxnests,ngrid,nxn,nyn,iwftouse,xt,yt,level,itime1,itime2,itime, & |
---|
[e200b7a] | 6 | yint1,yint2,yint3) |
---|
| 7 | ! i i i i i i |
---|
| 8 | ! i i i i i i i i i i i |
---|
| 9 | ! o o o |
---|
| 10 | !**************************************************************************** |
---|
| 11 | ! * |
---|
| 12 | ! Interpolation of meteorological fields on 2-d model layers for nested * |
---|
| 13 | ! grids. This routine is related to levlin3interpol.f for the mother domain* |
---|
| 14 | ! * |
---|
| 15 | ! In horizontal direction bilinear interpolation interpolation is used. * |
---|
| 16 | ! Temporally a linear interpolation is used. * |
---|
| 17 | ! Three fields are interpolated at the same time. * |
---|
| 18 | ! * |
---|
| 19 | ! This is a special version of levlininterpol to save CPU time. * |
---|
| 20 | ! * |
---|
| 21 | ! 1 first time * |
---|
| 22 | ! 2 second time * |
---|
| 23 | ! * |
---|
| 24 | ! * |
---|
| 25 | ! Author: A. Stohl * |
---|
| 26 | ! * |
---|
| 27 | ! 15 March 2000 * |
---|
| 28 | ! * |
---|
| 29 | !**************************************************************************** |
---|
| 30 | ! * |
---|
| 31 | ! Variables: * |
---|
| 32 | ! * |
---|
| 33 | ! dt1,dt2 time differences between fields and current position * |
---|
| 34 | ! dz1,dz2 z distance between levels and current position * |
---|
| 35 | ! height(nzmax) heights of the model levels * |
---|
| 36 | ! indexh help variable * |
---|
| 37 | ! indz the level closest to the current trajectory position * |
---|
| 38 | ! indzh help variable * |
---|
| 39 | ! itime current time * |
---|
| 40 | ! itime1 time of the first wind field * |
---|
| 41 | ! itime2 time of the second wind field * |
---|
| 42 | ! ix,jy x,y coordinates of lower left subgrid point * |
---|
| 43 | ! level level at which interpolation shall be done * |
---|
[0ecc1fe] | 44 | ! iwftouse points to the place of the wind field * |
---|
[e200b7a] | 45 | ! nx,ny actual field dimensions in x,y and z direction * |
---|
| 46 | ! nxmax,nymax,nzmax maximum field dimensions in x,y and z direction * |
---|
| 47 | ! xt current x coordinate * |
---|
| 48 | ! yint the final interpolated value * |
---|
| 49 | ! yt current y coordinate * |
---|
| 50 | ! yy(0:nxmax,0:nymax,nzmax,3) meteorological field used for interpolation * |
---|
| 51 | ! zt current z coordinate * |
---|
| 52 | ! * |
---|
| 53 | !**************************************************************************** |
---|
[8a65cb0] | 54 | use par_mod, only: numwfmem |
---|
[e200b7a] | 55 | |
---|
| 56 | implicit none |
---|
| 57 | |
---|
| 58 | integer :: maxnests,ngrid |
---|
[0ecc1fe] | 59 | integer :: nxn(maxnests),nyn(maxnests),nxmaxn,nymaxn,nzmax,iwftouse |
---|
[e200b7a] | 60 | integer :: m,ix,jy,ixp,jyp,itime,itime1,itime2,level,indexh |
---|
[8a65cb0] | 61 | real :: yy1(0:nxmaxn-1,0:nymaxn-1,nzmax,numwfmem,maxnests) |
---|
| 62 | real :: yy2(0:nxmaxn-1,0:nymaxn-1,nzmax,numwfmem,maxnests) |
---|
| 63 | real :: yy3(0:nxmaxn-1,0:nymaxn-1,nzmax,numwfmem,maxnests) |
---|
[e200b7a] | 64 | real :: ddx,ddy,rddx,rddy,dt1,dt2,dt,y1(2),y2(2),y3(2) |
---|
| 65 | real :: xt,yt,yint1,yint2,yint3,p1,p2,p3,p4 |
---|
| 66 | |
---|
| 67 | |
---|
| 68 | |
---|
| 69 | ! If point at border of grid -> small displacement into grid |
---|
| 70 | !*********************************************************** |
---|
| 71 | |
---|
[db712a8] | 72 | ! if (xt.ge.(real(nxn(ngrid)-1)-0.0001)) & |
---|
| 73 | ! xt=real(nxn(ngrid)-1)-0.0001 |
---|
| 74 | ! if (yt.ge.(real(nyn(ngrid)-1)-0.0001)) & |
---|
| 75 | ! yt=real(nyn(ngrid)-1)-0.0001 |
---|
| 76 | |
---|
| 77 | ! ESO make it consistent with interpol_rain |
---|
| 78 | if (xt.ge.(real(nxn(ngrid)-1))) xt=real(nxn(ngrid)-1)-0.00001 |
---|
| 79 | if (yt.ge.(real(nyn(ngrid)-1))) yt=real(nyn(ngrid)-1)-0.00001 |
---|
[e200b7a] | 80 | |
---|
| 81 | |
---|
| 82 | |
---|
| 83 | !********************************************************************** |
---|
| 84 | ! 1.) Bilinear horizontal interpolation |
---|
| 85 | ! This has to be done separately for 2 fields (Temporal) |
---|
| 86 | !******************************************************* |
---|
| 87 | |
---|
| 88 | ! Determine the lower left corner and its distance to the current position |
---|
| 89 | !************************************************************************* |
---|
| 90 | |
---|
| 91 | ix=int(xt) |
---|
| 92 | jy=int(yt) |
---|
[db712a8] | 93 | |
---|
[e200b7a] | 94 | ixp=ix+1 |
---|
| 95 | jyp=jy+1 |
---|
| 96 | ddx=xt-real(ix) |
---|
| 97 | ddy=yt-real(jy) |
---|
| 98 | rddx=1.-ddx |
---|
| 99 | rddy=1.-ddy |
---|
| 100 | p1=rddx*rddy |
---|
| 101 | p2=ddx*rddy |
---|
| 102 | p3=rddx*ddy |
---|
| 103 | p4=ddx*ddy |
---|
| 104 | |
---|
| 105 | |
---|
| 106 | ! Loop over 2 time steps |
---|
| 107 | !*********************** |
---|
| 108 | |
---|
[0ecc1fe] | 109 | ! do m=1,2 |
---|
| 110 | ! indexh=memind(m) |
---|
| 111 | indexh=iwftouse |
---|
[e200b7a] | 112 | |
---|
[0ecc1fe] | 113 | y1(1)=p1*yy1(ix ,jy ,level,indexh,ngrid) & |
---|
[e200b7a] | 114 | + p2*yy1(ixp,jy ,level,indexh,ngrid) & |
---|
| 115 | + p3*yy1(ix ,jyp,level,indexh,ngrid) & |
---|
| 116 | + p4*yy1(ixp,jyp,level,indexh,ngrid) |
---|
[0ecc1fe] | 117 | y2(1)=p1*yy2(ix ,jy ,level,indexh,ngrid) & |
---|
[e200b7a] | 118 | + p2*yy2(ixp,jy ,level,indexh,ngrid) & |
---|
| 119 | + p3*yy2(ix ,jyp,level,indexh,ngrid) & |
---|
| 120 | + p4*yy2(ixp,jyp,level,indexh,ngrid) |
---|
[0ecc1fe] | 121 | y3(1)=p1*yy3(ix ,jy ,level,indexh,ngrid) & |
---|
[e200b7a] | 122 | + p2*yy3(ixp,jy ,level,indexh,ngrid) & |
---|
| 123 | + p3*yy3(ix ,jyp,level,indexh,ngrid) & |
---|
| 124 | + p4*yy3(ixp,jyp,level,indexh,ngrid) |
---|
[0ecc1fe] | 125 | ! end do |
---|
[e200b7a] | 126 | |
---|
| 127 | |
---|
| 128 | !************************************ |
---|
| 129 | ! 2.) Temporal interpolation (linear) |
---|
| 130 | !************************************ |
---|
| 131 | |
---|
[0ecc1fe] | 132 | ! dt1=real(itime-itime1) |
---|
| 133 | ! dt2=real(itime2-itime) |
---|
| 134 | ! dt=dt1+dt2 |
---|
[e200b7a] | 135 | |
---|
[0ecc1fe] | 136 | ! yint1=(y1(1)*dt2+y1(2)*dt1)/dt |
---|
| 137 | ! yint2=(y2(1)*dt2+y2(2)*dt1)/dt |
---|
| 138 | ! yint3=(y3(1)*dt2+y3(2)*dt1)/dt |
---|
[e200b7a] | 139 | |
---|
[0ecc1fe] | 140 | yint1=y1(1) |
---|
| 141 | yint2=y2(1) |
---|
| 142 | yint3=y3(1) |
---|
[e200b7a] | 143 | |
---|
| 144 | end subroutine interpol_rain_nests |
---|