!********************************************************************** ! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010 * ! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa, * ! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann * ! * ! This file is part of FLEXPART. * ! * ! FLEXPART is free software: you can redistribute it and/or modify * ! it under the terms of the GNU General Public License as published by* ! the Free Software Foundation, either version 3 of the License, or * ! (at your option) any later version. * ! * ! FLEXPART is distributed in the hope that it will be useful, * ! but WITHOUT ANY WARRANTY; without even the implied warranty of * ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * ! GNU General Public License for more details. * ! * ! You should have received a copy of the GNU General Public License * ! along with FLEXPART. If not, see . * !********************************************************************** subroutine gridcheck !********************************************************************** ! * ! FLEXPART MODEL SUBROUTINE GRIDCHECK * ! * !********************************************************************** ! * ! AUTHOR: G. WOTAWA * ! DATE: 1997-08-06 * ! LAST UPDATE: 1997-10-10 * ! * ! Update: 1999-02-08, global fields allowed, A. Stohl* ! * !********************************************************************** ! * ! DESCRIPTION: * ! * ! THIS SUBROUTINE DETERMINES THE GRID SPECIFICATIONS (LOWER LEFT * ! LONGITUDE, LOWER LEFT LATITUDE, NUMBER OF GRID POINTS, GRID DIST- * ! ANCE AND VERTICAL DISCRETIZATION OF THE ECMWF MODEL) FROM THE * ! GRIB HEADER OF THE FIRST INPUT FILE. THE CONSISTANCY (NO CHANGES * ! WITHIN ONE FLEXPART RUN) IS CHECKED IN THE ROUTINE "READWIND" AT * ! ANY CALL. * ! * ! XLON0 geographical longitude of lower left gridpoint * ! YLAT0 geographical latitude of lower left gridpoint * ! NX number of grid points x-direction * ! NY number of grid points y-direction * ! DX grid distance x-direction * ! DY grid distance y-direction * ! NUVZ number of grid points for horizontal wind * ! components in z direction * ! NWZ number of grid points for vertical wind * ! component in z direction * ! sizesouth, sizenorth give the map scale (i.e. number of virtual grid* ! points of the polar stereographic grid): * ! used to check the CFL criterion * ! UVHEIGHT(1)- heights of gridpoints where u and v are * ! UVHEIGHT(NUVZ) given * ! WHEIGHT(1)- heights of gridpoints where w is given * ! WHEIGHT(NWZ) * ! * !********************************************************************** use par_mod use com_mod use conv_mod implicit none integer :: ix,jy,i,ifn,ifield,j,k,iumax,iwmax,numskip real :: xaux1,xaux2,yaux1,yaux2,sizesouth,sizenorth,xauxa,pint ! VARIABLES AND ARRAYS NEEDED FOR GRIB DECODING ! dimension of isec2 at least (22+n), where n is the number of parallels or ! meridians in a quasi-regular (reduced) Gaussian or lat/long grid ! dimension of zsec2 at least (10+nn), where nn is the number of vertical ! coordinate parameters integer :: isec0(2),isec1(56),isec2(22+nxmax+nymax),isec3(2) integer :: isec4(64),inbuff(jpack),ilen,ierr,iword,lunit !integer iswap real :: zsec2(60+2*nuvzmax),zsec3(2),zsec4(jpunp) character(len=1) :: opt, yoper = 'D' iumax=0 iwmax=0 if(ideltas.gt.0) then ifn=1 else ifn=numbwf endif ! ! OPENING OF DATA FILE (GRIB CODE) ! 5 call pbopen(lunit,path(3)(1:length(3))//wfname(ifn),'r',ierr) if(ierr.lt.0) goto 999 ifield=0 10 ifield=ifield+1 ! ! GET NEXT FIELDS ! call pbgrib(lunit,inbuff,jpack,ilen,ierr) if(ierr.eq.-1) goto 30 ! EOF DETECTED if(ierr.lt.-1) goto 999 ! ERROR DETECTED ierr=1 ! Check whether we are on a little endian or on a big endian computer !******************************************************************** !if (inbuff(1).eq.1112101447) then ! little endian, swap bytes ! iswap=1+ilen/4 ! call swap32(inbuff,iswap) !else if (inbuff(1).ne.1196575042) then ! big endian ! stop 'subroutine gridcheck: corrupt GRIB data' !endif call gribex(isec0,isec1,isec2,zsec2,isec3,zsec3,isec4, & zsec4,jpunp,inbuff,jpack,iword,yoper,ierr) if (ierr.ne.0) goto 999 ! ERROR DETECTED if(ifield.eq.1) then nxfield=isec2(2) ny=isec2(3) xaux1=real(isec2(5))/1000. xaux2=real(isec2(8))/1000. if (xaux1.gt.180) xaux1=xaux1-360.0 if (xaux2.gt.180) xaux2=xaux2-360.0 if (xaux1.lt.-180) xaux1=xaux1+360.0 if (xaux2.lt.-180) xaux2=xaux2+360.0 if (xaux2.lt.xaux1) xaux2=xaux2+360. yaux1=real(isec2(7))/1000. yaux2=real(isec2(4))/1000. xlon0=xaux1 ylat0=yaux1 dx=(xaux2-xaux1)/real(nxfield-1) dy=(yaux2-yaux1)/real(ny-1) dxconst=180./(dx*r_earth*pi) dyconst=180./(dy*r_earth*pi) nlev_ec=isec2(12)/2-1 ! Check whether fields are global ! If they contain the poles, specify polar stereographic map ! projections using the stlmbr- and stcm2p-calls !*********************************************************** xauxa=abs(xaux2+dx-360.-xaux1) if (xauxa.lt.0.001) then nx=nxfield+1 ! field is cyclic xglobal=.true. if (abs(nxshift).ge.nx) & stop 'nxshift in file par_mod is too large' xlon0=xlon0+real(nxshift)*dx else nx=nxfield xglobal=.false. if (nxshift.ne.0) & stop 'nxshift (par_mod) must be zero for non-global domain' endif nxmin1=nx-1 nymin1=ny-1 if (xlon0.gt.180.) xlon0=xlon0-360. xauxa=abs(yaux1+90.) if (xglobal.and.xauxa.lt.0.001) then sglobal=.true. ! field contains south pole ! Enhance the map scale by factor 3 (*2=6) compared to north-south ! map scale sizesouth=6.*(switchsouth+90.)/dy call stlmbr(southpolemap,-90.,0.) call stcm2p(southpolemap,0.,0.,switchsouth,0.,sizesouth, & sizesouth,switchsouth,180.) switchsouthg=(switchsouth-ylat0)/dy else sglobal=.false. switchsouthg=999999. endif xauxa=abs(yaux2-90.) if (xglobal.and.xauxa.lt.0.001) then nglobal=.true. ! field contains north pole ! Enhance the map scale by factor 3 (*2=6) compared to north-south ! map scale sizenorth=6.*(90.-switchnorth)/dy call stlmbr(northpolemap,90.,0.) call stcm2p(northpolemap,0.,0.,switchnorth,0.,sizenorth, & sizenorth,switchnorth,180.) switchnorthg=(switchnorth-ylat0)/dy else nglobal=.false. switchnorthg=999999. endif endif if (nxshift.lt.0) stop 'nxshift (par_mod) must not be negative' if (nxshift.ge.nxfield) stop 'nxshift (par_mod) too large' k=isec1(8) if(isec1(6).eq.131) iumax=max(iumax,nlev_ec-k+1) if(isec1(6).eq.135) iwmax=max(iwmax,nlev_ec-k+1) if(isec1(6).eq.129) then do jy=0,ny-1 do ix=0,nxfield-1 ! write (*,*) 'ich stop!',nxfield,ny,jy,ix,ga ! stop oro(ix,jy)=zsec4(nxfield*(ny-jy-1)+ix+1)/ga end do end do endif if(isec1(6).eq.172) then do jy=0,ny-1 do ix=0,nxfield-1 lsm(ix,jy)=zsec4(nxfield*(ny-jy-1)+ix+1) end do end do endif if(isec1(6).eq.160) then do jy=0,ny-1 do ix=0,nxfield-1 excessoro(ix,jy)=zsec4(nxfield*(ny-jy-1)+ix+1) end do end do endif goto 10 !! READ NEXT LEVEL OR PARAMETER ! ! CLOSING OF INPUT DATA FILE ! 30 call pbclose(lunit,ierr) !! FINISHED READING / CLOSING GRIB FILE nuvz=iumax nwz =iwmax if(nuvz.eq.nlev_ec) nwz=nlev_ec+1 if (nx.gt.nxmax) then write(*,*) 'FLEXPART error: Too many grid points in x direction.' write(*,*) 'Reduce resolution of wind fields.' write(*,*) 'Or change parameter settings in file par_mod.' write(*,*) nx,nxmax stop endif if (ny.gt.nymax) then write(*,*) 'FLEXPART error: Too many grid points in y direction.' write(*,*) 'Reduce resolution of wind fields.' write(*,*) 'Or change parameter settings in file par_mod.' write(*,*) ny,nymax stop endif if (nuvz+1.gt.nuvzmax) then write(*,*) 'FLEXPART error: Too many u,v grid points in z '// & 'direction.' write(*,*) 'Reduce resolution of wind fields.' write(*,*) 'Or change parameter settings in file par_mod.' write(*,*) nuvz+1,nuvzmax stop endif if (nwz.gt.nwzmax) then write(*,*) 'FLEXPART error: Too many w grid points in z '// & 'direction.' write(*,*) 'Reduce resolution of wind fields.' write(*,*) 'Or change parameter settings in file par_mod.' write(*,*) nwz,nwzmax stop endif ! If desired, shift all grids by nxshift grid cells !************************************************** if (xglobal) then call shift_field_0(oro,nxfield,ny) call shift_field_0(lsm,nxfield,ny) call shift_field_0(excessoro,nxfield,ny) endif ! Output of grid info !******************** write(*,*) write(*,*) write(*,'(a,2i7)') '# of vertical levels in ECMWF data: ', & nuvz+1,nwz write(*,*) write(*,'(a)') 'Mother domain:' write(*,'(a,f10.2,a1,f10.2,a,f10.2)') ' Longitude range: ', & xlon0,' to ',xlon0+(nx-1)*dx,' Grid distance: ',dx write(*,'(a,f10.2,a1,f10.2,a,f10.2)') ' Latitude range: ', & ylat0,' to ',ylat0+(ny-1)*dy,' Grid distance: ',dy write(*,*) ! CALCULATE VERTICAL DISCRETIZATION OF ECMWF MODEL ! PARAMETER akm,bkm DESCRIBE THE HYBRID "ETA" COORDINATE SYSTEM numskip=nlev_ec-nuvz ! number of ecmwf model layers not used ! by trajectory model do i=1,nwz j=numskip+i k=nlev_ec+1+numskip+i akm(nwz-i+1)=zsec2(10+j) bkm(nwz-i+1)=zsec2(10+k) end do ! ! CALCULATION OF AKZ, BKZ ! AKZ,BKZ: model discretization parameters at the center of each model ! layer ! ! Assign the 10 m winds to an artificial model level with akz=0 and bkz=1.0, ! i.e. ground level !***************************************************************************** akz(1)=0. bkz(1)=1.0 do i=1,nuvz akz(i+1)=0.5*(akm(i+1)+akm(i)) bkz(i+1)=0.5*(bkm(i+1)+bkm(i)) end do nuvz=nuvz+1 ! NOTE: In FLEXPART versions up to 4.0, the number of model levels was doubled ! upon the transformation to z levels. In order to save computer memory, this is ! not done anymore in the standard version. However, this option can still be ! switched on by replacing the following lines with those below, that are ! currently commented out. For this, similar changes are necessary in ! verttransform.f and verttranform_nests.f !***************************************************************************** nz=nuvz if (nz.gt.nzmax) stop 'nzmax too small' do i=1,nuvz aknew(i)=akz(i) bknew(i)=bkz(i) end do ! Switch on following lines to use doubled vertical resolution !************************************************************* !nz=nuvz+nwz-1 !if (nz.gt.nzmax) stop 'nzmax too small' !do 100 i=1,nwz ! aknew(2*(i-1)+1)=akm(i) !00 bknew(2*(i-1)+1)=bkm(i) !do 110 i=2,nuvz ! aknew(2*(i-1))=akz(i) !10 bknew(2*(i-1))=bkz(i) ! End doubled vertical resolution ! Determine the uppermost level for which the convection scheme shall be applied ! by assuming that there is no convection above 50 hPa (for standard SLP) !***************************************************************************** do i=1,nuvz-2 pint=akz(i)+bkz(i)*101325. if (pint.lt.5000.) goto 96 end do 96 nconvlev=i if (nconvlev.gt.nconvlevmax-1) then nconvlev=nconvlevmax-1 write(*,*) 'Attention, convection only calculated up to ', & akz(nconvlev)+bkz(nconvlev)*1013.25,' hPa' endif return 999 write(*,*) write(*,*) ' ###########################################'// & '###### ' write(*,*) ' TRAJECTORY MODEL SUBROUTINE GRIDCHECK:' write(*,*) ' CAN NOT OPEN INPUT DATA FILE '//wfname(ifn) write(*,*) ' ###########################################'// & '###### ' write(*,*) write(*,'(a)') '!!! PLEASE INSERT A NEW CD-ROM AND !!!' write(*,'(a)') '!!! PRESS ANY KEY TO CONTINUE... !!!' write(*,'(a)') '!!! ...OR TERMINATE FLEXPART PRESSING!!!' write(*,'(a)') '!!! THE "X" KEY... !!!' write(*,*) read(*,'(a)') opt if(opt.eq.'X') then stop else goto 5 endif end subroutine gridcheck