[4] | 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 gridcheck |
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| 23 | |
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| 24 | !********************************************************************** |
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| 25 | ! * |
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| 26 | ! FLEXPART MODEL SUBROUTINE GRIDCHECK * |
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| 27 | ! * |
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| 28 | !********************************************************************** |
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| 29 | ! * |
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| 30 | ! AUTHOR: G. WOTAWA * |
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| 31 | ! DATE: 1997-08-06 * |
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| 32 | ! LAST UPDATE: 1997-10-10 * |
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| 33 | ! * |
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| 34 | ! Update: 1999-02-08, global fields allowed, A. Stohl* |
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| 35 | ! * |
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| 36 | !********************************************************************** |
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| 37 | ! * |
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| 38 | ! DESCRIPTION: * |
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| 39 | ! * |
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| 40 | ! THIS SUBROUTINE DETERMINES THE GRID SPECIFICATIONS (LOWER LEFT * |
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| 41 | ! LONGITUDE, LOWER LEFT LATITUDE, NUMBER OF GRID POINTS, GRID DIST- * |
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| 42 | ! ANCE AND VERTICAL DISCRETIZATION OF THE ECMWF MODEL) FROM THE * |
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| 43 | ! GRIB HEADER OF THE FIRST INPUT FILE. THE CONSISTANCY (NO CHANGES * |
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| 44 | ! WITHIN ONE FLEXPART RUN) IS CHECKED IN THE ROUTINE "READWIND" AT * |
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| 45 | ! ANY CALL. * |
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| 46 | ! * |
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| 47 | ! XLON0 geographical longitude of lower left gridpoint * |
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| 48 | ! YLAT0 geographical latitude of lower left gridpoint * |
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| 49 | ! NX number of grid points x-direction * |
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| 50 | ! NY number of grid points y-direction * |
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| 51 | ! DX grid distance x-direction * |
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| 52 | ! DY grid distance y-direction * |
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| 53 | ! NUVZ number of grid points for horizontal wind * |
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| 54 | ! components in z direction * |
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| 55 | ! NWZ number of grid points for vertical wind * |
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| 56 | ! component in z direction * |
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| 57 | ! sizesouth, sizenorth give the map scale (i.e. number of virtual grid* |
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| 58 | ! points of the polar stereographic grid): * |
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| 59 | ! used to check the CFL criterion * |
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| 60 | ! UVHEIGHT(1)- heights of gridpoints where u and v are * |
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| 61 | ! UVHEIGHT(NUVZ) given * |
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| 62 | ! WHEIGHT(1)- heights of gridpoints where w is given * |
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| 63 | ! WHEIGHT(NWZ) * |
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| 64 | ! * |
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| 65 | !********************************************************************** |
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| 66 | |
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| 67 | use par_mod |
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| 68 | use com_mod |
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| 69 | use conv_mod |
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| 70 | |
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| 71 | implicit none |
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| 72 | |
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| 73 | integer :: ix,jy,i,ifn,ifield,j,k,iumax,iwmax,numskip |
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| 74 | real :: xaux1,xaux2,yaux1,yaux2,sizesouth,sizenorth,xauxa,pint |
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| 75 | |
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| 76 | ! VARIABLES AND ARRAYS NEEDED FOR GRIB DECODING |
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| 77 | |
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| 78 | ! dimension of isec2 at least (22+n), where n is the number of parallels or |
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| 79 | ! meridians in a quasi-regular (reduced) Gaussian or lat/long grid |
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| 80 | |
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| 81 | ! dimension of zsec2 at least (10+nn), where nn is the number of vertical |
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| 82 | ! coordinate parameters |
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| 83 | |
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| 84 | integer :: isec0(2),isec1(56),isec2(22+nxmax+nymax),isec3(2) |
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| 85 | integer :: isec4(64),inbuff(jpack),ilen,ierr,iword,lunit |
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| 86 | !integer iswap |
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| 87 | real :: zsec2(60+2*nuvzmax),zsec3(2),zsec4(jpunp) |
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| 88 | character(len=1) :: opt, yoper = 'D' |
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| 89 | |
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| 90 | |
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| 91 | iumax=0 |
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| 92 | iwmax=0 |
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| 93 | |
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| 94 | if(ideltas.gt.0) then |
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| 95 | ifn=1 |
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| 96 | else |
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| 97 | ifn=numbwf |
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| 98 | endif |
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| 99 | ! |
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| 100 | ! OPENING OF DATA FILE (GRIB CODE) |
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| 101 | ! |
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| 102 | 5 call pbopen(lunit,path(3)(1:length(3))//wfname(ifn),'r',ierr) |
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| 103 | if(ierr.lt.0) goto 999 |
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| 104 | |
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| 105 | ifield=0 |
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| 106 | 10 ifield=ifield+1 |
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| 107 | ! |
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| 108 | ! GET NEXT FIELDS |
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| 109 | ! |
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| 110 | call pbgrib(lunit,inbuff,jpack,ilen,ierr) |
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| 111 | if(ierr.eq.-1) goto 30 ! EOF DETECTED |
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| 112 | if(ierr.lt.-1) goto 999 ! ERROR DETECTED |
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| 113 | |
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| 114 | ierr=1 |
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| 115 | |
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| 116 | ! Check whether we are on a little endian or on a big endian computer |
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| 117 | !******************************************************************** |
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| 118 | |
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| 119 | !if (inbuff(1).eq.1112101447) then ! little endian, swap bytes |
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| 120 | ! iswap=1+ilen/4 |
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| 121 | ! call swap32(inbuff,iswap) |
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| 122 | !else if (inbuff(1).ne.1196575042) then ! big endian |
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| 123 | ! stop 'subroutine gridcheck: corrupt GRIB data' |
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| 124 | !endif |
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| 125 | |
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| 126 | call gribex(isec0,isec1,isec2,zsec2,isec3,zsec3,isec4, & |
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| 127 | zsec4,jpunp,inbuff,jpack,iword,yoper,ierr) |
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| 128 | if (ierr.ne.0) goto 999 ! ERROR DETECTED |
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| 129 | |
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| 130 | if(ifield.eq.1) then |
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| 131 | nxfield=isec2(2) |
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| 132 | ny=isec2(3) |
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| 133 | xaux1=real(isec2(5))/1000. |
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| 134 | xaux2=real(isec2(8))/1000. |
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| 135 | if (xaux1.gt.180) xaux1=xaux1-360.0 |
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| 136 | if (xaux2.gt.180) xaux2=xaux2-360.0 |
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| 137 | if (xaux1.lt.-180) xaux1=xaux1+360.0 |
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| 138 | if (xaux2.lt.-180) xaux2=xaux2+360.0 |
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| 139 | if (xaux2.lt.xaux1) xaux2=xaux2+360. |
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| 140 | yaux1=real(isec2(7))/1000. |
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| 141 | yaux2=real(isec2(4))/1000. |
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| 142 | xlon0=xaux1 |
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| 143 | ylat0=yaux1 |
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| 144 | dx=(xaux2-xaux1)/real(nxfield-1) |
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| 145 | dy=(yaux2-yaux1)/real(ny-1) |
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| 146 | dxconst=180./(dx*r_earth*pi) |
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| 147 | dyconst=180./(dy*r_earth*pi) |
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| 148 | nlev_ec=isec2(12)/2-1 |
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| 149 | |
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| 150 | |
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| 151 | ! Check whether fields are global |
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| 152 | ! If they contain the poles, specify polar stereographic map |
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| 153 | ! projections using the stlmbr- and stcm2p-calls |
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| 154 | !*********************************************************** |
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| 155 | |
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| 156 | xauxa=abs(xaux2+dx-360.-xaux1) |
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| 157 | if (xauxa.lt.0.001) then |
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| 158 | nx=nxfield+1 ! field is cyclic |
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| 159 | xglobal=.true. |
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| 160 | if (abs(nxshift).ge.nx) & |
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| 161 | stop 'nxshift in file par_mod is too large' |
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| 162 | xlon0=xlon0+real(nxshift)*dx |
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| 163 | else |
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| 164 | nx=nxfield |
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| 165 | xglobal=.false. |
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| 166 | if (nxshift.ne.0) & |
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| 167 | stop 'nxshift (par_mod) must be zero for non-global domain' |
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| 168 | endif |
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| 169 | nxmin1=nx-1 |
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| 170 | nymin1=ny-1 |
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| 171 | if (xlon0.gt.180.) xlon0=xlon0-360. |
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| 172 | xauxa=abs(yaux1+90.) |
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| 173 | if (xglobal.and.xauxa.lt.0.001) then |
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| 174 | sglobal=.true. ! field contains south pole |
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| 175 | ! Enhance the map scale by factor 3 (*2=6) compared to north-south |
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| 176 | ! map scale |
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| 177 | sizesouth=6.*(switchsouth+90.)/dy |
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| 178 | call stlmbr(southpolemap,-90.,0.) |
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| 179 | call stcm2p(southpolemap,0.,0.,switchsouth,0.,sizesouth, & |
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| 180 | sizesouth,switchsouth,180.) |
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| 181 | switchsouthg=(switchsouth-ylat0)/dy |
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| 182 | else |
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| 183 | sglobal=.false. |
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| 184 | switchsouthg=999999. |
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| 185 | endif |
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| 186 | xauxa=abs(yaux2-90.) |
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| 187 | if (xglobal.and.xauxa.lt.0.001) then |
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| 188 | nglobal=.true. ! field contains north pole |
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| 189 | ! Enhance the map scale by factor 3 (*2=6) compared to north-south |
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| 190 | ! map scale |
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| 191 | sizenorth=6.*(90.-switchnorth)/dy |
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| 192 | call stlmbr(northpolemap,90.,0.) |
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| 193 | call stcm2p(northpolemap,0.,0.,switchnorth,0.,sizenorth, & |
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| 194 | sizenorth,switchnorth,180.) |
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| 195 | switchnorthg=(switchnorth-ylat0)/dy |
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| 196 | else |
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| 197 | nglobal=.false. |
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| 198 | switchnorthg=999999. |
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| 199 | endif |
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| 200 | endif |
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| 201 | |
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| 202 | if (nxshift.lt.0) stop 'nxshift (par_mod) must not be negative' |
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| 203 | if (nxshift.ge.nxfield) stop 'nxshift (par_mod) too large' |
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| 204 | |
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| 205 | k=isec1(8) |
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| 206 | if(isec1(6).eq.131) iumax=max(iumax,nlev_ec-k+1) |
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| 207 | if(isec1(6).eq.135) iwmax=max(iwmax,nlev_ec-k+1) |
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| 208 | |
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| 209 | if(isec1(6).eq.129) then |
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| 210 | do jy=0,ny-1 |
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| 211 | do ix=0,nxfield-1 |
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| 212 | ! write (*,*) 'ich stop!',nxfield,ny,jy,ix,ga |
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| 213 | ! stop |
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| 214 | oro(ix,jy)=zsec4(nxfield*(ny-jy-1)+ix+1)/ga |
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| 215 | end do |
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| 216 | end do |
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| 217 | endif |
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| 218 | if(isec1(6).eq.172) then |
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| 219 | do jy=0,ny-1 |
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| 220 | do ix=0,nxfield-1 |
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| 221 | lsm(ix,jy)=zsec4(nxfield*(ny-jy-1)+ix+1) |
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| 222 | end do |
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| 223 | end do |
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| 224 | endif |
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| 225 | if(isec1(6).eq.160) then |
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| 226 | do jy=0,ny-1 |
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| 227 | do ix=0,nxfield-1 |
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| 228 | excessoro(ix,jy)=zsec4(nxfield*(ny-jy-1)+ix+1) |
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| 229 | end do |
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| 230 | end do |
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| 231 | endif |
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| 232 | |
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| 233 | goto 10 !! READ NEXT LEVEL OR PARAMETER |
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| 234 | ! |
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| 235 | ! CLOSING OF INPUT DATA FILE |
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| 236 | ! |
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| 237 | 30 call pbclose(lunit,ierr) !! FINISHED READING / CLOSING GRIB FILE |
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| 238 | |
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| 239 | nuvz=iumax |
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| 240 | nwz =iwmax |
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| 241 | if(nuvz.eq.nlev_ec) nwz=nlev_ec+1 |
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| 242 | |
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| 243 | if (nx.gt.nxmax) then |
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| 244 | write(*,*) 'FLEXPART error: Too many grid points in x direction.' |
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| 245 | write(*,*) 'Reduce resolution of wind fields.' |
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| 246 | write(*,*) 'Or change parameter settings in file par_mod.' |
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| 247 | write(*,*) nx,nxmax |
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| 248 | stop |
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| 249 | endif |
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| 250 | |
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| 251 | if (ny.gt.nymax) then |
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| 252 | write(*,*) 'FLEXPART error: Too many grid points in y direction.' |
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| 253 | write(*,*) 'Reduce resolution of wind fields.' |
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| 254 | write(*,*) 'Or change parameter settings in file par_mod.' |
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| 255 | write(*,*) ny,nymax |
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| 256 | stop |
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| 257 | endif |
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| 258 | |
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| 259 | if (nuvz+1.gt.nuvzmax) then |
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| 260 | write(*,*) 'FLEXPART error: Too many u,v grid points in z '// & |
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| 261 | 'direction.' |
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| 262 | write(*,*) 'Reduce resolution of wind fields.' |
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| 263 | write(*,*) 'Or change parameter settings in file par_mod.' |
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| 264 | write(*,*) nuvz+1,nuvzmax |
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| 265 | stop |
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| 266 | endif |
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| 267 | |
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| 268 | if (nwz.gt.nwzmax) then |
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| 269 | write(*,*) 'FLEXPART error: Too many w grid points in z '// & |
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| 270 | 'direction.' |
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| 271 | write(*,*) 'Reduce resolution of wind fields.' |
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| 272 | write(*,*) 'Or change parameter settings in file par_mod.' |
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| 273 | write(*,*) nwz,nwzmax |
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| 274 | stop |
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| 275 | endif |
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| 276 | |
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| 277 | ! If desired, shift all grids by nxshift grid cells |
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| 278 | !************************************************** |
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| 279 | |
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| 280 | if (xglobal) then |
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| 281 | call shift_field_0(oro,nxfield,ny) |
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| 282 | call shift_field_0(lsm,nxfield,ny) |
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| 283 | call shift_field_0(excessoro,nxfield,ny) |
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| 284 | endif |
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| 285 | |
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| 286 | ! Output of grid info |
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| 287 | !******************** |
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| 288 | |
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| 289 | write(*,*) |
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| 290 | write(*,*) |
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| 291 | write(*,'(a,2i7)') '# of vertical levels in ECMWF data: ', & |
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| 292 | nuvz+1,nwz |
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| 293 | write(*,*) |
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| 294 | write(*,'(a)') 'Mother domain:' |
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| 295 | write(*,'(a,f10.2,a1,f10.2,a,f10.2)') ' Longitude range: ', & |
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| 296 | xlon0,' to ',xlon0+(nx-1)*dx,' Grid distance: ',dx |
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| 297 | write(*,'(a,f10.2,a1,f10.2,a,f10.2)') ' Latitude range: ', & |
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| 298 | ylat0,' to ',ylat0+(ny-1)*dy,' Grid distance: ',dy |
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| 299 | write(*,*) |
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| 300 | |
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| 301 | |
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| 302 | ! CALCULATE VERTICAL DISCRETIZATION OF ECMWF MODEL |
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| 303 | ! PARAMETER akm,bkm DESCRIBE THE HYBRID "ETA" COORDINATE SYSTEM |
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| 304 | |
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| 305 | numskip=nlev_ec-nuvz ! number of ecmwf model layers not used |
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| 306 | ! by trajectory model |
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| 307 | do i=1,nwz |
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| 308 | j=numskip+i |
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| 309 | k=nlev_ec+1+numskip+i |
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| 310 | akm(nwz-i+1)=zsec2(10+j) |
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| 311 | bkm(nwz-i+1)=zsec2(10+k) |
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| 312 | end do |
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| 313 | |
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| 314 | ! |
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| 315 | ! CALCULATION OF AKZ, BKZ |
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| 316 | ! AKZ,BKZ: model discretization parameters at the center of each model |
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| 317 | ! layer |
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| 318 | ! |
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| 319 | ! Assign the 10 m winds to an artificial model level with akz=0 and bkz=1.0, |
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| 320 | ! i.e. ground level |
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| 321 | !***************************************************************************** |
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| 322 | |
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| 323 | akz(1)=0. |
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| 324 | bkz(1)=1.0 |
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| 325 | do i=1,nuvz |
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| 326 | akz(i+1)=0.5*(akm(i+1)+akm(i)) |
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| 327 | bkz(i+1)=0.5*(bkm(i+1)+bkm(i)) |
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| 328 | end do |
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| 329 | nuvz=nuvz+1 |
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| 330 | |
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| 331 | ! NOTE: In FLEXPART versions up to 4.0, the number of model levels was doubled |
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| 332 | ! upon the transformation to z levels. In order to save computer memory, this is |
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| 333 | ! not done anymore in the standard version. However, this option can still be |
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| 334 | ! switched on by replacing the following lines with those below, that are |
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| 335 | ! currently commented out. For this, similar changes are necessary in |
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| 336 | ! verttransform.f and verttranform_nests.f |
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| 337 | !***************************************************************************** |
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| 338 | |
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| 339 | nz=nuvz |
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| 340 | if (nz.gt.nzmax) stop 'nzmax too small' |
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| 341 | do i=1,nuvz |
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| 342 | aknew(i)=akz(i) |
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| 343 | bknew(i)=bkz(i) |
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| 344 | end do |
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| 345 | |
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| 346 | ! Switch on following lines to use doubled vertical resolution |
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| 347 | !************************************************************* |
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| 348 | !nz=nuvz+nwz-1 |
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| 349 | !if (nz.gt.nzmax) stop 'nzmax too small' |
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| 350 | !do 100 i=1,nwz |
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| 351 | ! aknew(2*(i-1)+1)=akm(i) |
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| 352 | !00 bknew(2*(i-1)+1)=bkm(i) |
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| 353 | !do 110 i=2,nuvz |
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| 354 | ! aknew(2*(i-1))=akz(i) |
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| 355 | !10 bknew(2*(i-1))=bkz(i) |
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| 356 | ! End doubled vertical resolution |
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| 357 | |
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| 358 | |
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| 359 | ! Determine the uppermost level for which the convection scheme shall be applied |
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| 360 | ! by assuming that there is no convection above 50 hPa (for standard SLP) |
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| 361 | !***************************************************************************** |
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| 362 | |
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| 363 | do i=1,nuvz-2 |
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| 364 | pint=akz(i)+bkz(i)*101325. |
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| 365 | if (pint.lt.5000.) goto 96 |
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| 366 | end do |
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| 367 | 96 nconvlev=i |
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| 368 | if (nconvlev.gt.nconvlevmax-1) then |
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| 369 | nconvlev=nconvlevmax-1 |
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| 370 | write(*,*) 'Attention, convection only calculated up to ', & |
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| 371 | akz(nconvlev)+bkz(nconvlev)*1013.25,' hPa' |
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| 372 | endif |
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| 373 | |
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| 374 | return |
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| 375 | |
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| 376 | 999 write(*,*) |
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| 377 | write(*,*) ' ###########################################'// & |
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| 378 | '###### ' |
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| 379 | write(*,*) ' TRAJECTORY MODEL SUBROUTINE GRIDCHECK:' |
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| 380 | write(*,*) ' CAN NOT OPEN INPUT DATA FILE '//wfname(ifn) |
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| 381 | write(*,*) ' ###########################################'// & |
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| 382 | '###### ' |
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| 383 | write(*,*) |
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| 384 | write(*,'(a)') '!!! PLEASE INSERT A NEW CD-ROM AND !!!' |
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| 385 | write(*,'(a)') '!!! PRESS ANY KEY TO CONTINUE... !!!' |
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| 386 | write(*,'(a)') '!!! ...OR TERMINATE FLEXPART PRESSING!!!' |
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| 387 | write(*,'(a)') '!!! THE "X" KEY... !!!' |
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| 388 | write(*,*) |
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| 389 | read(*,'(a)') opt |
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| 390 | if(opt.eq.'X') then |
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| 391 | stop |
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| 392 | else |
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| 393 | goto 5 |
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| 394 | endif |
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| 395 | |
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| 396 | end subroutine gridcheck |
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