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michaesp |
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c ************************************************************
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c * This package provides input routines to read the wind *
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c * and other fields from IVE necdf files. The routines are *
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c * *
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c * 1) input_open : to open a data file *
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c * 2) input_grid : to read the grid information, including *
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c * the vertical levels *
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c * 3) input_wind : to read the wind components *
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c * 4) input_close : to close an input file *
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c * *
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c * The file is characterised by an filename <filename> and *
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c * a file identifier <fid>. The horizontal grid is given by *
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c * <xmin,xmax,ymin,ymax,dx,dy,nx,ny> where the pole of the *
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c * rotated grid is given by <pollon,pollat>. The vertical *
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c * grid is characterised by the surface pressure <ps> and *
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c * the pressure at staggered <slev> and unstaggered <ulev> *
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c * levels. The number of levels is given by <nz>. Finally, *
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c * the retrieval of the wind <field> with name <fieldname> *
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c * is characterised by a <time> and a missing data value *
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c * <mdv>. *
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c * *
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c * Author: Michael Sprenger, Autumn 2008 *
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c ************************************************************
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c ------------------------------------------------------------
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c Open input file
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c ------------------------------------------------------------
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subroutine input_open (fid,filename)
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c Open the input file with filename <filename> and return the
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c file identifier <fid> for further reference.
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implicit none
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c Declaration of subroutine parameters
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integer fid ! File identifier
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character*80 filename ! Filename
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c Declaration of auxiliary variables
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integer ierr
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c Open IVE netcdf file
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call cdfopn(filename,fid,ierr)
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if (ierr.ne.0) goto 900
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c Exception handling
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return
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900 print*,'Cannot open input file ',trim(filename)
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stop
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end
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c ------------------------------------------------------------
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c Read information about the grid
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c ------------------------------------------------------------
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subroutine input_grid
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> (fid,fieldname,xmin,xmax,ymin,ymax,dx,dy,nx,ny,
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> time,pollon,pollat,p3,ps,nz,ak,bk,stagz,
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> timecheck)
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c Read grid information at <time> from file with identifier <fid>.
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c The horizontal grid is characterized by <xmin,xmax,ymin,ymax,dx,dy>
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c with pole position at <pollon,pollat> and grid dimension <nx,ny>.
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c The 3d arrays <p3(nx,ny,nz)> gives the vertical coordinates, either
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c on the staggered or unstaggered grid (with <stagz> as the flag).
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c The surface pressure is given in <ps(nx,ny)>. If <fid> is negative,
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c only the grid dimensions and grid parameters (xmin...pollat,nz) are
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c determined and returned (this is needed for dynamical allocation of
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c memory).
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implicit none
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c Declaration of subroutine parameters
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integer fid ! File identifier
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real xmin,xmax,ymin,ymax ! Domain size
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real dx,dy ! Horizontal resolution
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integer nx,ny,nz ! Grid dimensions
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real pollon,pollat ! Longitude and latitude of pole
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real p3(nx,ny,nz) ! Staggered levels
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real ps(nx,ny) ! Surface pressure
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real time ! Time of the grid information
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real ak(nz),bk(nz) ! Ak and Bk for layers or levels
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real stagz ! Vertical staggering (0 or -0.5)
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character*80 fieldname ! Variable from which to take grid info
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character*80 timecheck ! Either 'yes' or 'no'
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c Numerical and physical parameters
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real eps ! Numerical epsilon
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parameter (eps=0.001)
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c Netcdf variables
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integer vardim(4)
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real varmin(4),varmax(4)
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real mdv
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real stag(4)
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integer ndim
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character*80 cstfile
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integer cstid
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real times(10)
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integer ntimes
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real aklay(nz),bklay(nz),aklev(nz),bklev(nz)
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integer nvars
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character*80 vars(100)
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c Auxiliary varaibles
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integer ierr
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integer i,j,k
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integer isok
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real tmp(200)
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character*80 varname
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real rtime
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integer is2d
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c Init the flag for 2D variables - assume a 3D field
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is2d = 0
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c Inquire dimensions and grid constants if <fid> is negative
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if (fid.lt.0) then
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c Get grid info for the selected variable
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if ( fieldname.eq.'PLEV' ) then
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varname = 'PS'
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stagz = 0.
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call getdef(-fid,varname,ndim,mdv,vardim,
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> varmin,varmax,stag,ierr)
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if (ierr.ne.0) goto 900
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call getcfn(-fid,cstfile,ierr)
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if (ierr.ne.0) goto 903
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call cdfopn(cstfile,cstid,ierr)
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if (ierr.ne.0) goto 903
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call getlevs(cstid,vardim(3),tmp,tmp,tmp,tmp,ierr)
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if (ierr.ne.0) goto 903
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call clscdf(cstid,ierr)
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if (ierr.ne.0) goto 903
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elseif ( ( fieldname.eq.'PLAY' ).or.( fieldname.eq.'P' ) ) then
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varname = 'PS'
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stagz = -0.5
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call getdef(-fid,varname,ndim,mdv,vardim,
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> varmin,varmax,stag,ierr)
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if (ierr.ne.0) goto 900
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call getcfn(-fid,cstfile,ierr)
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if (ierr.ne.0) goto 903
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call cdfopn(cstfile,cstid,ierr)
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if (ierr.ne.0) goto 903
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call getlevs(cstid,vardim(3),tmp,tmp,tmp,tmp,ierr)
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if (ierr.ne.0) goto 903
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call clscdf(cstid,ierr)
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if (ierr.ne.0) goto 903
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else
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varname = fieldname
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call getdef(-fid,varname,ndim,mdv,vardim,
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> varmin,varmax,stag,ierr)
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if (ierr.ne.0) goto 900
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endif
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c Set the grid dimensions and constants - vardim(3) is taken from constants file
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nx = vardim(1)
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ny = vardim(2)
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nz = vardim(3)
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xmin = varmin(1)
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ymin = varmin(2)
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xmax = varmax(1)
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ymax = varmax(2)
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dx = (xmax-xmin)/real(nx-1)
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dy = (ymax-ymin)/real(ny-1)
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c Get pole position - if no constants file available, set default pole
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call getcfn(-fid,cstfile,ierr)
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if (ierr.eq.0) then
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call cdfopn(cstfile,cstid,ierr)
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if (ierr.ne.0) goto 903
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call getpole(cstid,pollon,pollat,ierr)
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if (ierr.ne.0) goto 903
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call clscdf(cstid,ierr)
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if (ierr.ne.0) goto 903
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else
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pollon = 0.
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pollat = 90.
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endif
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c Get non-constant grid parameters (surface pressure and vertical grid)
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else
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c Get full grid info - in particular staggering flag; set flag for 2D tracing
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if ( fieldname.eq.'PLEV' ) then
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varname = 'PS'
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stagz = 0.
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call getdef(fid,varname,ndim,mdv,vardim,
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> varmin,varmax,stag,ierr)
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if (ierr.ne.0) goto 900
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call getcfn(fid,cstfile,ierr)
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if (ierr.ne.0) goto 903
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call cdfopn(cstfile,cstid,ierr)
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if (ierr.ne.0) goto 903
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call getlevs(cstid,vardim(3),tmp,tmp,tmp,tmp,ierr)
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if (ierr.ne.0) goto 903
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call clscdf(cstid,ierr)
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if (ierr.ne.0) goto 903
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elseif ( ( fieldname.eq.'PLAY' ).or.( fieldname.eq.'P' ) ) then
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varname = 'PS'
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stagz = -0.5
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call getdef(fid,varname,ndim,mdv,vardim,
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> varmin,varmax,stag,ierr)
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if (ierr.ne.0) goto 900
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call getcfn(fid,cstfile,ierr)
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if (ierr.ne.0) goto 903
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call cdfopn(cstfile,cstid,ierr)
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if (ierr.ne.0) goto 903
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call getlevs(cstid,vardim(3),tmp,tmp,tmp,tmp,ierr)
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if (ierr.ne.0) goto 903
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call clscdf(cstid,ierr)
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if (ierr.ne.0) goto 903
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else
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varname=fieldname
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call getdef(fid,varname,ndim,mdv,vardim,
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> varmin,varmax,stag,ierr)
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if (ierr.ne.0) goto 900
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if (vardim(3).eq.1) is2d = 1
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endif
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c Get time information (check if time is correct)
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call gettimes(fid,times,ntimes,ierr)
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if (ierr.ne.0) goto 901
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isok=0
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do i=1,ntimes
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if (abs(time-times(i)).lt.eps) then
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isok = 1
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rtime = times(i)
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elseif (timecheck.eq.'no') then
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isok = 1
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rtime = times(1)
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endif
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enddo
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if ( isok.eq.0) goto 905
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c If 2D tracing requested: take dummay values for PS, AKLEV,BKLEV,AKLAY,BKLAY
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if ( is2d.eq.1 ) then
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do i=1,nx
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do j=1,ny
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ps(i,j) = 1050.
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enddo
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enddo
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do k=1,nz
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aklev(k) = 0.
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bklev(k) = real(nz-k)/real(nz-1)
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aklay(k) = 0.
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bklay(k) = real(nz-k)/real(nz-1)
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enddo
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c 3D tracing - read PS, AKLEV,BKLEV,AKLAY;BKLAY
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else
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c Read the level coefficients from the constants file
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call getcfn(fid,cstfile,ierr)
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if (ierr.ne.0) goto 903
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call cdfopn(cstfile,cstid,ierr)
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if (ierr.ne.0) goto 903
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call getlevs(cstid,vardim(3),aklev,bklev,aklay,bklay,ierr)
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if (ierr.ne.0) goto 903
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call clscdf(cstid,ierr)
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if (ierr.ne.0) goto 903
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c Read surface pressure
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varname='PS'
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call getdat(fid,varname,rtime,0,ps,ierr)
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if (ierr.ne.0) goto 904
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endif
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c Calculate layer and level pressures
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do i=1,nx
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do j=1,ny
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do k=1,nz
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if ( abs(stagz).lt.eps ) then
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p3(i,j,k)=aklev(k)+bklev(k)*ps(i,j)
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else
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p3(i,j,k)=aklay(k)+bklay(k)*ps(i,j)
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endif
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enddo
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enddo
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enddo
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c Set the ak and bk for the vertical grid
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do k=1,nz
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if ( abs(stagz).lt.eps ) then
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ak(k)=aklev(k)
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bk(k)=bklev(k)
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else
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ak(k)=aklay(k)
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bk(k)=bklay(k)
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endif
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enddo
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endif
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c Exit point for subroutine
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800 continue
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return
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c Exception handling
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312 |
900 print*,'Cannot retrieve grid dimension from ',fid
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stop
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901 print*,'Cannot retrieve grid parameters from ',fid
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stop
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902 print*,'Grid inconsistency detected for ',fid
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stop
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903 print*,'Problem with level coefficients from ',trim(cstfile)
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stop
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904 print*,'Cannot read surface pressure from ',trim(cstfile)
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stop
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905 print*,'Cannot find time ',time,' on ',fid
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stop
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906 print*,'Unable to get grid info ',fid
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stop
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end
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c ------------------------------------------------------------
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330 |
c Read wind information
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331 |
c ------------------------------------------------------------
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332 |
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333 |
subroutine input_wind (fid,fieldname,field,time,stagz,mdv,
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334 |
> xmin,xmax,ymin,ymax,dx,dy,nx,ny,nz,
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> timecheck)
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336 |
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337 |
c Read the wind component <fieldname> from the file with identifier
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c <fid> and save it in the 3d array <field>. The vertical staggering
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339 |
c information is provided in <stagz> and gives the reference to either
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c the layer or level field from <input_grid>. A consistency check is
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341 |
c performed to have an agreement with the grid specified by <xmin,xmax,
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342 |
c ymin,ymax,dx,dy,nx,ny,nz>.
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343 |
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344 |
implicit none
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345 |
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346 |
c Declaration of variables and parameters
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347 |
integer fid ! File identifier
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348 |
character*80 fieldname ! Name of the wind field
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349 |
integer nx,ny,nz ! Dimension of fields
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|
|
350 |
real field(nx,ny,nz) ! 3d wind field
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|
351 |
real stagz ! Staggering in the z direction
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|
352 |
real mdv ! Missing data flag
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|
353 |
real xmin,xmax,ymin,ymax ! Domain size
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354 |
real dx,dy ! Horizontal resolution
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|
355 |
real time ! Time
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|
356 |
character*80 timecheck ! Either 'yes' or 'no'
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357 |
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|
358 |
c Numerical and physical parameters
|
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|
359 |
real eps ! Numerical epsilon
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|
360 |
parameter (eps=0.001)
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|
361 |
real notimecheck ! 'Flag' for no time check
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|
362 |
parameter (notimecheck=7.26537)
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363 |
|
|
|
364 |
c Netcdf variables
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|
365 |
integer ierr
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366 |
character*80 varname
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|
367 |
integer vardim(4)
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|
368 |
real varmin(4),varmax(4)
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|
369 |
real stag(4)
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|
370 |
integer ndim
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|
371 |
real times(10)
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|
372 |
integer ntimes
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373 |
character*80 cstfile
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|
374 |
integer cstid
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|
375 |
real aklay(200),bklay(200),aklev(200),bklev(200)
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|
376 |
real ps(nx,ny)
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377 |
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|
378 |
c Auxiliary variables
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|
379 |
integer isok
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|
380 |
integer i,j,k
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|
381 |
integer nz1
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|
382 |
real rtime
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383 |
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|
384 |
c Read variable definition - for P, PLEV and PLAY: load also ak,bk
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|
385 |
if ( ( fieldname.eq.'PLEV' ).or.
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|
386 |
> ( fieldname.eq.'PLAY' ).or.
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|
387 |
> ( fieldname.eq.'P' ) )
|
|
|
388 |
>then
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|
389 |
call getcfn(fid,cstfile,ierr)
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|
|
390 |
if (ierr.ne.0) goto 905
|
|
|
391 |
call cdfopn(cstfile,cstid,ierr)
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|
|
392 |
if (ierr.ne.0) goto 905
|
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|
393 |
call getlevs(cstid,nz1,aklev,bklev,aklay,bklay,ierr)
|
|
|
394 |
if (ierr.ne.0) goto 905
|
|
|
395 |
call clscdf(cstid,ierr)
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|
|
396 |
if (ierr.ne.0) goto 905
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|
|
397 |
varname = 'PS'
|
|
|
398 |
call getdef(fid,varname,ndim,mdv,vardim,
|
|
|
399 |
> varmin,varmax,stag,ierr)
|
|
|
400 |
vardim(3) = nz1
|
|
|
401 |
if (ierr.ne.0) goto 900
|
|
|
402 |
else
|
|
|
403 |
varname = fieldname
|
|
|
404 |
call getdef(fid,varname,ndim,mdv,vardim,
|
|
|
405 |
> varmin,varmax,stag,ierr)
|
|
|
406 |
if (ierr.ne.0) goto 900
|
|
|
407 |
stagz=stag(3)
|
|
|
408 |
endif
|
|
|
409 |
|
|
|
410 |
c Get time information (set time to first one in the file)
|
|
|
411 |
call gettimes(fid,times,ntimes,ierr)
|
|
|
412 |
if (ierr.ne.0) goto 902
|
|
|
413 |
isok=0
|
|
|
414 |
do i=1,ntimes
|
|
|
415 |
if (abs(time-times(i)).lt.eps) then
|
|
|
416 |
isok = 1
|
|
|
417 |
rtime = times(i)
|
|
|
418 |
elseif (timecheck.eq.'no') then
|
|
|
419 |
isok = 1
|
|
|
420 |
rtime = times(1)
|
|
|
421 |
endif
|
|
|
422 |
enddo
|
|
|
423 |
if ( isok.eq.0 ) goto 904
|
|
|
424 |
|
|
|
425 |
c Read field
|
|
|
426 |
if ( ( fieldname.eq.'P' ).or.(fieldname.eq.'PLAY') ) then ! P, PLAY
|
|
|
427 |
stagz = -0.5
|
|
|
428 |
varname = 'PS'
|
|
|
429 |
call getdat(fid,varname,rtime,0,ps,ierr)
|
|
|
430 |
if (ierr.ne.0) goto 903
|
|
|
431 |
do i=1,nx
|
|
|
432 |
do j=1,ny
|
|
|
433 |
do k=1,nz
|
|
|
434 |
field(i,j,k)=aklay(k)+bklay(k)*ps(i,j)
|
|
|
435 |
enddo
|
|
|
436 |
enddo
|
|
|
437 |
enddo
|
|
|
438 |
|
|
|
439 |
elseif ( fieldname.eq.'PLEV' ) then ! PLEV
|
|
|
440 |
stagz = 0.
|
|
|
441 |
varname = 'PS'
|
|
|
442 |
call getdat(fid,varname,rtime,0,ps,ierr)
|
|
|
443 |
if (ierr.ne.0) goto 903
|
|
|
444 |
do i=1,nx
|
|
|
445 |
do j=1,ny
|
|
|
446 |
do k=1,nz
|
|
|
447 |
field(i,j,k)=aklev(k)+bklev(k)*ps(i,j)
|
|
|
448 |
enddo
|
|
|
449 |
enddo
|
|
|
450 |
enddo
|
|
|
451 |
|
|
|
452 |
else ! Other fields
|
|
|
453 |
varname=fieldname
|
|
|
454 |
call getdat(fid,varname,rtime,0,field,ierr)
|
|
|
455 |
if (ierr.ne.0) goto 903
|
|
|
456 |
|
|
|
457 |
endif
|
|
|
458 |
|
|
|
459 |
c If the field is 2D, expand it to 3D - simple handling of 2D tracing
|
|
|
460 |
if ( vardim(3).eq.1 ) then
|
|
|
461 |
do i=1,nx
|
|
|
462 |
do j=1,ny
|
|
|
463 |
do k=1,nz
|
|
|
464 |
field(i,j,k) = field(i,j,1)
|
|
|
465 |
enddo
|
|
|
466 |
enddo
|
|
|
467 |
enddo
|
|
|
468 |
endif
|
|
|
469 |
|
|
|
470 |
|
|
|
471 |
|
|
|
472 |
c Exception handling
|
|
|
473 |
return
|
|
|
474 |
|
|
|
475 |
900 print*,'Cannot retrieve definition for ',trim(varname),' ',fid
|
|
|
476 |
stop
|
|
|
477 |
901 print*,'Grid inconsistency detected for ',trim(varname),' ',fid
|
|
|
478 |
stop
|
|
|
479 |
902 print*,'Cannot retrieve time for ',trim(varname),' ',fid
|
|
|
480 |
stop
|
|
|
481 |
903 print*,'Cannot load wind component ',trim(varname),' ',fid
|
|
|
482 |
stop
|
|
|
483 |
904 print*,'Cannot load time ',time,' for ',trim(varname),' ',fid
|
|
|
484 |
stop
|
|
|
485 |
905 print*,'Cannot load time vertical grid AK, BK from file ',fid
|
|
|
486 |
stop
|
|
|
487 |
|
|
|
488 |
end
|
|
|
489 |
|
|
|
490 |
c ------------------------------------------------------------
|
|
|
491 |
c Close input file
|
|
|
492 |
c ------------------------------------------------------------
|
|
|
493 |
|
|
|
494 |
subroutine input_close(fid)
|
|
|
495 |
|
|
|
496 |
c Close the input file with file identifier <fid>.
|
|
|
497 |
|
|
|
498 |
implicit none
|
|
|
499 |
|
|
|
500 |
c Declaration of subroutine parameters
|
|
|
501 |
integer fid
|
|
|
502 |
|
|
|
503 |
c Auxiliary variables
|
|
|
504 |
integer ierr
|
|
|
505 |
|
|
|
506 |
c Close file
|
|
|
507 |
call clscdf(fid,ierr)
|
|
|
508 |
|
|
|
509 |
end
|