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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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use netcdf
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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 netcdf file
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ierr = NF90_OPEN(TRIM(filename),nf90_nowrite, fid)
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IF ( ierr /= nf90_NoErr ) PRINT *,NF90_STRERROR(ierr)
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c Exception handling
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return
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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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use netcdf
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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 aklay(nz),bklay(nz)
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integer nvars
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character*80 vars(100)
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integer dimids (nf90_max_var_dims)
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character*80 dimname(nf90_max_var_dims)
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real,allocatable, dimension (:) :: lon,lat,lev
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real,allocatable, dimension (:) :: times
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real,allocatable, dimension (:,:) :: tmp2
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real,allocatable, dimension (:,:,:) :: tmp3
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character*80 units
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c Auxiliary variables
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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 varid
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integer cdfid
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integer stat
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real delta
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integer closear
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real maxps,minps
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c ------ Set file identifier --------------------------------------
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if (fid.lt.0) then
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cdfid = -fid
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else
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cdfid = fid
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endif
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c Special handling if 3D pressure is
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if ( fieldname.eq.'P' ) then
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fieldname = 'U'
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endif
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c Get number of dimensions of variable -> ndim
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ierr = NF90_INQ_VARID(cdfid,fieldname,varid)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = nf90_inquire_variable(cdfid, varid, ndims = ndim)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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if ( ndim.ne.4 ) then
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print*,' ERROR: netCDF variables need to be 4D'
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print*,' ',trim(fieldname)
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stop
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endif
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c Get dimensions -> vardim(1:ndim),dimname(1:ndim)
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ierr = NF90_INQ_VARID(cdfid,fieldname,varid)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = nf90_inquire_variable(cdfid, varid,
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> dimids = dimids(1:ndim))
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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do i=1,ndim
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ierr = nf90_inquire_dimension(cdfid, dimids(i),
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> name = dimname(i) )
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = nf90_inquire_dimension(cdfid, dimids(i),len=vardim(i))
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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enddo
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c Check whether the list of dimensions is OK
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if ( ( dimname(1).ne.'lon' ).or.
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> ( dimname(2).ne.'lat' ).or.
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> ( dimname(3).ne.'lev' ).and.( dimname(3).ne.'lev_2' ).or.
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> ( dimname(4).ne.'time' ) )
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>then
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print*,' ERROR: the dimensions of the variable are not correct'
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print*,' expected -> lon / lat / lev / time'
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print*, ( trim(dimname(i))//' / ',i=1,ndim )
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stop
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endif
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c Allocate memory for reading arrays
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allocate(tmp2(vardim(1),vardim(2)),stat=stat)
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if (stat.ne.0) print*,'*** error allocating array tmp2 ***'
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allocate(tmp3(vardim(1),vardim(2),vardim(3)),stat=stat)
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if (stat.ne.0) print*,'*** error allocating array tmp3 ***'
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allocate(lon(vardim(1)),stat=stat)
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if (stat.ne.0) print*,'*** error allocating array lon ***'
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allocate(lat(vardim(2)),stat=stat)
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if (stat.ne.0) print*,'*** error allocating array lat ***'
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allocate(times(vardim(4)),stat=stat)
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if (stat.ne.0) print*,'*** error allocating array times ***'
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c Get domain longitudes and latitudes
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varname = dimname(1)
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ierr = NF90_INQ_VARID(cdfid,varname,varid)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = nf90_get_var(cdfid,varid,lon)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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varname = dimname(2)
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ierr = NF90_INQ_VARID(cdfid,varname,varid)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = nf90_get_var(cdfid,varid,lat)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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c Get ak and bk
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varname='hyam'
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ierr = NF90_INQ_VARID(cdfid,varname,varid)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = nf90_get_var(cdfid,varid,ak)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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varname='hybm'
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ierr = NF90_INQ_VARID(cdfid,varname,varid)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = nf90_get_var(cdfid,varid,bk)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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c Check that unit of ak is in hPa - if necessary correct it
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varname='hyam'
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ierr = NF90_INQ_VARID(cdfid,varname,varid)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = nf90_get_att(cdfid, varid, "units", units)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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if ( units.eq.'Pa' ) then
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print*,'Hallo'
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do i=1,vardim(3)
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ak(k) = 0.01 * ak(k)
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enddo
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endif
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c Get time information (check if time is correct)
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varname = 'time'
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ierr = NF90_INQ_VARID(cdfid,varname,varid)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = nf90_get_var(cdfid,varid,times)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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isok=0
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do i=1,vardim(4)
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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 ) then
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print*,' ERROR: time ',rtime,' not found on netCDF file'
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stop
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endif
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c Read surface pressure
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varname='PS'
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ierr = NF90_INQ_VARID(cdfid,varname,varid)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = nf90_get_var(cdfid,varid,tmp2)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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c Check that surface pressure is in hPa
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maxps = -1.e39
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minps = 1.e39
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do i=1,vardim(1)
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do j=1,vardim(2)
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if (tmp2(i,j).gt.maxps) maxps = tmp2(i,j)
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if (tmp2(i,j).lt.minps) minps = tmp2(i,j)
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enddo
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enddo
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if ( (maxps.gt.1500.).or.(minps.lt.300.) ) then
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print*,' ERROR: surface pressre PS must be in hPa'
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print*,' ',maxps,minps
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stop
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endif
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c Calculate layer and level pressures
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do i=1,vardim(1)
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do j=1,vardim(2)
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do k=1,vardim(3)
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tmp3(i,j,k)=ak(k)+bk(k)*tmp2(i,j)
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enddo
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enddo
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enddo
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c Set the grid dimensions and constants
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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 = lon(1)
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ymin = lat(1)
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xmax = lon(nx)
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ymax = lat(ny)
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dx = (xmax-xmin)/real(nx-1)
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dy = (ymax-ymin)/real(ny-1)
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pollon = 0.
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pollat = 90.
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stagz = 0.
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delta = xmax-xmin-360.
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if (abs(delta+dx).lt.eps) then
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xmax = xmax + dx
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nx = nx + 1
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closear = 1
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else
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closear = 0
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endif
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c Save the output arrays (if fid>0) - close arrays on request
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if ( fid.gt.0 ) then
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do j=1,vardim(2)
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do i=1,vardim(1)
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ps(i,j) = tmp2(i,j)
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enddo
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if (closear.eq.1) ps(vardim(1)+1,j) = ps(1,j)
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enddo
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do j=1,vardim(2)
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do k=1,vardim(3)
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do i=1,vardim(1)
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p3(i,j,k) = tmp3(i,j,k)
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enddo
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if (closear.eq.1) p3(vardim(1)+1,j,k) = p3(1,j,k)
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enddo
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enddo
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endif
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return
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end
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c ------------------------------------------------------------
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c Read wind information
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c ------------------------------------------------------------
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subroutine input_wind (fid,fieldname,field,time,stagz,mdv,
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> xmin,xmax,ymin,ymax,dx,dy,nx,ny,nz,
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> timecheck)
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c Read the wind component <fieldname> from the file with identifier
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333 |
c <fid> and save it in the 3d array <field>. The vertical staggering
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334 |
c information is provided in <stagz> and gives the reference to either
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|
335 |
c the layer or level field from <input_grid>. A consistency check is
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336 |
c performed to have an agreement with the grid specified by <xmin,xmax,
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337 |
c ymin,ymax,dx,dy,nx,ny,nz>.
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338 |
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|
339 |
use netcdf
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340 |
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341 |
implicit none
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342 |
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343 |
c Declaration of variables and parameters
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344 |
integer fid ! File identifier
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345 |
character*80 fieldname ! Name of the wind field
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346 |
integer nx,ny,nz ! Dimension of fields
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347 |
real field(nx,ny,nz) ! 3d wind field
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348 |
real stagz ! Staggering in the z direction
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349 |
real mdv ! Missing data flag
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350 |
real xmin,xmax,ymin,ymax ! Domain size
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351 |
real dx,dy ! Horizontal resolution
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352 |
real time ! Time
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353 |
character*80 timecheck ! Either 'yes' or 'no'
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354 |
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355 |
c Numerical and physical parameters
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356 |
real eps ! Numerical epsilon
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357 |
parameter (eps=0.001)
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358 |
real notimecheck ! 'Flag' for no time check
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359 |
parameter (notimecheck=7.26537)
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360 |
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361 |
c Netcdf variables
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362 |
integer ierr
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363 |
character*80 varname
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|
364 |
integer vardim(4)
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365 |
real varmin(4),varmax(4)
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366 |
real stag(4)
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367 |
integer ndim
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368 |
real times(10)
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369 |
integer ntimes
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370 |
character*80 cstfile
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371 |
integer cstid
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372 |
real aklay(200),bklay(200),aklev(200),bklev(200)
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373 |
real ps(nx,ny)
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374 |
integer dimids (nf90_max_var_dims)
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375 |
character*80 dimname(nf90_max_var_dims)
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|
376 |
integer varid
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377 |
integer cdfid
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378 |
real,allocatable, dimension (:) :: lon,lat
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379 |
real,allocatable, dimension (:,:) :: tmp2
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380 |
real,allocatable, dimension (:,:,:) :: tmp3
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381 |
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382 |
c Auxiliary variables
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383 |
integer isok
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384 |
integer i,j,k
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385 |
integer nz1
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386 |
real rtime
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|
387 |
integer closear
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|
388 |
integer stat
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|
389 |
real delta
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|
390 |
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|
391 |
c Get the number of dimensions -> ndim
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392 |
ierr = NF90_INQ_VARID(fid,fieldname,varid)
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393 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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|
394 |
ierr = nf90_inquire_variable(fid, varid, ndims = ndim)
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|
395 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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396 |
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|
397 |
c Get the dimensions of the arrays -> varid(1:ndim)
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|
398 |
ierr = NF90_INQ_VARID(fid,fieldname,varid)
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|
399 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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|
400 |
ierr = nf90_inquire_variable(fid, varid,
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|
401 |
> dimids = dimids(1:ndim))
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|
402 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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|
403 |
do i=1,ndim
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|
404 |
ierr = nf90_inquire_dimension(fid, dimids(i),
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|
405 |
> name = dimname(i) )
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|
406 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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|
407 |
ierr = nf90_inquire_dimension(fid, dimids(i),len=vardim(i))
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|
408 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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|
409 |
enddo
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|
410 |
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|
411 |
c Check whether the list of dimensions is OK
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|
412 |
if ( ( dimname(1).ne.'lon' ).or.
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|
413 |
> ( dimname(2).ne.'lat' ).or.
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|
414 |
> ( dimname(3).ne.'lev' ).and.( dimname(3).ne.'lev_2' ).or.
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|
415 |
> ( dimname(4).ne.'time' ) )
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|
416 |
>then
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|
417 |
print*,' ERROR: the dimensions of the variable are not correct'
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|
418 |
print*,' expected -> lon / lat / lev / time'
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|
419 |
print*, ( trim(dimname(i))//' / ',i=1,ndim )
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|
420 |
stop
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|
421 |
endif
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|
422 |
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|
423 |
c Allocate memory for reading arrays - depending on <closear>
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|
|
424 |
allocate(tmp2(vardim(1),vardim(2)),stat=stat)
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|
425 |
if (stat.ne.0) print*,'*** error allocating array tmp2 ***'
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|
426 |
allocate(tmp3(vardim(1),vardim(2),vardim(3)),stat=stat)
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|
|
427 |
if (stat.ne.0) print*,'*** error allocating array tmp3 ***'
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|
|
428 |
allocate(lon(vardim(1)),stat=stat)
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|
|
429 |
if (stat.ne.0) print*,'*** error allocating array lon ***'
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|
430 |
allocate(lat(vardim(2)),stat=stat)
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|
|
431 |
if (stat.ne.0) print*,'*** error allocating array lat ***'
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|
|
432 |
|
|
|
433 |
c Get domain boundaries
|
|
|
434 |
varname = dimname(1)
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|
|
435 |
ierr = NF90_INQ_VARID(fid,varname,varid)
|
|
|
436 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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|
|
437 |
ierr = nf90_get_var(fid,varid,lon)
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|
|
438 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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|
|
439 |
varname = dimname(2)
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|
|
440 |
ierr = NF90_INQ_VARID(fid,varname,varid)
|
|
|
441 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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|
|
442 |
ierr = nf90_get_var(fid,varid,lat)
|
|
|
443 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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|
|
444 |
|
|
|
445 |
c Read data
|
|
|
446 |
ierr = NF90_INQ_VARID(fid,fieldname,varid)
|
|
|
447 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
448 |
ierr = nf90_get_var(fid,varid,tmp3)
|
|
|
449 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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|
|
450 |
|
|
|
451 |
c If the field is 2D, expand it to 3D - simple handling of 2D tracing
|
|
|
452 |
if ( vardim(3).eq.1 ) then
|
|
|
453 |
do i=1,vardim(1)
|
|
|
454 |
do j=1,vardim(2)
|
|
|
455 |
do k=1,vardim(3)
|
|
|
456 |
tmp3(i,j,k) = tmp3(i,j,1)
|
|
|
457 |
enddo
|
|
|
458 |
enddo
|
|
|
459 |
enddo
|
|
|
460 |
endif
|
|
|
461 |
|
|
|
462 |
c Save the ouput array - close on request
|
|
|
463 |
dx = (varmax(1)-varmin(1))/real(vardim(1)-1)
|
|
|
464 |
delta = varmax(1)-varmin(1)-360.
|
|
|
465 |
if (abs(delta+dx).lt.eps) then
|
|
|
466 |
closear = 1
|
|
|
467 |
else
|
|
|
468 |
closear = 0
|
|
|
469 |
endif
|
|
|
470 |
|
|
|
471 |
do j=1,vardim(2)
|
|
|
472 |
do k=1,vardim(3)
|
|
|
473 |
do i=1,vardim(1)
|
|
|
474 |
field(i,j,k) = tmp3(i,j,k)
|
|
|
475 |
enddo
|
|
|
476 |
if (closear.eq.1) field(vardim(1)+1,j,k) = field(1,j,k)
|
|
|
477 |
enddo
|
|
|
478 |
enddo
|
|
|
479 |
|
|
|
480 |
c Exit point
|
|
|
481 |
return
|
|
|
482 |
|
|
|
483 |
end
|
|
|
484 |
|
|
|
485 |
c ------------------------------------------------------------
|
|
|
486 |
c Close input file
|
|
|
487 |
c ------------------------------------------------------------
|
|
|
488 |
|
|
|
489 |
subroutine input_close(fid)
|
|
|
490 |
|
|
|
491 |
c Close the input file with file identifier <fid>.
|
|
|
492 |
|
|
|
493 |
use netcdf
|
|
|
494 |
|
|
|
495 |
implicit none
|
|
|
496 |
|
|
|
497 |
c Declaration of subroutine parameters
|
|
|
498 |
integer fid
|
|
|
499 |
|
|
|
500 |
c Auxiliary variables
|
|
|
501 |
integer ierr
|
|
|
502 |
|
|
|
503 |
c Close file
|
|
|
504 |
ierr = NF90_CLOSE(fid)
|
|
|
505 |
IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
506 |
|
|
|
507 |
end
|
|
|
508 |
|
|
|
509 |
c ------------------------------------------------------------
|
|
|
510 |
c Get a list of variables on netCDF file
|
|
|
511 |
c ------------------------------------------------------------
|
|
|
512 |
|
|
|
513 |
subroutine input_getvars(fid,vnam,nvars)
|
|
|
514 |
|
|
|
515 |
c List of variables on netCDF file
|
|
|
516 |
|
|
|
517 |
use netcdf
|
|
|
518 |
|
|
|
519 |
implicit none
|
|
|
520 |
|
|
|
521 |
c Declaration of subroutine parameters
|
|
|
522 |
integer fid
|
|
|
523 |
integer nvars
|
|
|
524 |
character*80 vnam(200)
|
|
|
525 |
|
|
|
526 |
c Auxiliary variables
|
|
|
527 |
integer ierr
|
|
|
528 |
integer i
|
|
|
529 |
integer nDims,nGlobalAtts,unlimdimid
|
|
|
530 |
|
|
|
531 |
ierr = nf90_inquire(fid, nDims, nVars, nGlobalAtts, unlimdimid)
|
|
|
532 |
IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
533 |
|
|
|
534 |
do i=1,nVars
|
|
|
535 |
ierr = nf90_inquire_variable(fid, i, name = vnam(i))
|
|
|
536 |
enddo
|
|
|
537 |
|
|
|
538 |
end
|