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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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integer nvars
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character*80 vars(100)
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integer dimids (nf90_max_var_dims),dimid
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character*80 dimname(nf90_max_var_dims)
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character*80 stdname
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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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real,allocatable, dimension (:) :: aktmp,bktmp
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character*80 units
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character*80 leveltype
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integer nakbktmp
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integer vertical_swap
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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 ---- Read data from netCDF file as they are ---------------------
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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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c if ( ndim.ne.4 ) then
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c print*,' ERROR: netCDF variables need to be 4D'
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c print*,' ',trim(fieldname)
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c stop
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c 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 ( ndim.eq.4 ) then
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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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else
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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.'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 / 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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endif
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c Check about the type of vertical levels
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if ( ndim.eq.4 ) then
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c Get dimension of AK,BK
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varname = 'nhym'
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ierr = NF90_INQ_DIMID(cdfid,varname,dimid)
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ierr = nf90_inquire_dimension(cdfid, dimid,len=nakbktmp)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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varname=dimname(3)
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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, "standard_name", leveltype)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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if ( (leveltype.ne.'hybrid_sigma_pressure').and.
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> (leveltype.ne.'air_pressure' ) )
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> then
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print*,' ERROR: input netCDF data must be on hybrid-sigma'
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print*,' or air pressure levels!',trim(leveltype)
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stop
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endif
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else
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leveltype='air_pressure'
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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(lev(vardim(3)),stat=stat)
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if (stat.ne.0) print*,'*** error allocating array lev ***'
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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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if ( ndim.eq.4 ) then
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allocate(aktmp(nakbktmp),stat=stat)
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if (stat.ne.0) print*,'*** error allocating array aktmp ***'
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allocate(bktmp(nakbktmp),stat=stat)
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if (stat.ne.0) print*,'*** error allocating array bktmp ***'
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endif
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c Get domain longitudes, latitudes and levels
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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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varname = dimname(3)
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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,lev)
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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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if ( ndim.eq.4 ) then
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c Read ak, 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,aktmp)
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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,bktmp)
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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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do k=1,nakbktmp
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aktmp(k) = 0.01 * aktmp(k)
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enddo
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endif
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endif
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c Check that unit of lev is in hPa - if necessary correct it
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if ( leveltype.eq.'air_pressure' .and. vardim(3) .gt. 1) then
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varname='lev'
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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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do k=1,vardim(3)
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lev(k) = 0.01 * lev(k)
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enddo
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endif
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endif
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c Decide whether to swap vertical levels - highest pressure at index 1
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vertical_swap = 1
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if ( leveltype.eq.'hybrid_sigma_pressure') then
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if ( (aktmp(1) + bktmp(1) * 1000.).gt.
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> (aktmp(2) + bktmp(2) * 1000.) )
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> then
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vertical_swap = 0
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endif
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elseif ( leveltype.eq.'air_pressure') then
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if ( lev(1).gt.lev(2) ) then
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vertical_swap = 0
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endif
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endif
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c print*,' Vertical SWAP P -> ', vertical_swap
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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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321 |
isok=0
|
|
|
322 |
do i=1,vardim(4)
|
|
|
323 |
if (abs(time-times(i)).lt.eps) then
|
|
|
324 |
isok = 1
|
|
|
325 |
rtime = times(i)
|
|
|
326 |
elseif (timecheck.eq.'no') then
|
|
|
327 |
isok = 1
|
|
|
328 |
rtime = times(1)
|
|
|
329 |
endif
|
|
|
330 |
enddo
|
|
|
331 |
if ( isok.eq.0 ) then
|
|
|
332 |
print*,' ERROR: time ',rtime,' not found on netCDF file'
|
|
|
333 |
stop
|
|
|
334 |
endif
|
|
|
335 |
|
|
|
336 |
c Read surface pressure
|
|
|
337 |
varname='PS'
|
|
|
338 |
ierr = NF90_INQ_VARID(cdfid,varname,varid)
|
|
|
339 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
340 |
ierr = nf90_get_var(cdfid,varid,tmp2)
|
|
|
341 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
342 |
|
|
|
343 |
c Check that surface pressure is in hPa
|
|
|
344 |
if ( leveltype.eq.'hybrid_sigma_pressure' ) then
|
|
|
345 |
maxps = -1.e19
|
|
|
346 |
minps = 1.e19
|
|
|
347 |
do i=1,vardim(1)
|
|
|
348 |
do j=1,vardim(2)
|
|
|
349 |
if (tmp2(i,j).gt.maxps) maxps = tmp2(i,j)
|
|
|
350 |
if (tmp2(i,j).lt.minps) minps = tmp2(i,j)
|
|
|
351 |
enddo
|
|
|
352 |
enddo
|
|
|
353 |
if ( (maxps.gt.1500.).or.(minps.lt.300.) ) then
|
|
|
354 |
print*,' ERROR: surface pressre PS must be in hPa'
|
|
|
355 |
print*,' ',maxps,minps
|
|
|
356 |
stop
|
|
|
357 |
endif
|
|
|
358 |
endif
|
|
|
359 |
|
|
|
360 |
c ---- Define output of subroutine --------------------------------
|
|
|
361 |
|
|
|
362 |
c If not full list of vertical levels, reduce AK,BK arrays
|
|
|
363 |
if ( (leveltype.eq.'hybrid_sigma_pressure').and.
|
|
|
364 |
> (nakbktmp.ne.vardim(3) ) )
|
|
|
365 |
>then
|
|
|
366 |
c print*,' WARNING: only subset of vertical levels used...'
|
|
|
367 |
do k=1,vardim(3)
|
|
|
368 |
if ( vertical_swap.eq.1 ) then
|
|
|
369 |
aktmp(k) = aktmp( k+nakbktmp-vardim(3) )
|
|
|
370 |
bktmp(k) = bktmp( k+nakbktmp-vardim(3) )
|
|
|
371 |
endif
|
|
|
372 |
enddo
|
|
|
373 |
endif
|
|
|
374 |
|
|
|
375 |
c Set the grid dimensions and constants
|
|
|
376 |
nx = vardim(1)
|
|
|
377 |
ny = vardim(2)
|
|
|
378 |
nz = vardim(3)
|
|
|
379 |
xmin = lon(1)
|
|
|
380 |
ymin = lat(1)
|
|
|
381 |
xmax = lon(nx)
|
|
|
382 |
ymax = lat(ny)
|
|
|
383 |
dx = (xmax-xmin)/real(nx-1)
|
|
|
384 |
dy = (ymax-ymin)/real(ny-1)
|
|
|
385 |
pollon = 0.
|
|
|
386 |
pollat = 90.
|
|
|
387 |
stagz = 0.
|
|
|
388 |
delta = xmax-xmin-360.
|
|
|
389 |
if (abs(delta+dx).lt.eps) then
|
|
|
390 |
xmax = xmax + dx
|
|
|
391 |
nx = nx + 1
|
|
|
392 |
closear = 1
|
|
|
393 |
else
|
|
|
394 |
closear = 0
|
|
|
395 |
endif
|
|
|
396 |
|
|
|
397 |
c Save the output arrays (if fid>0) - close arrays on request
|
|
|
398 |
if ( fid.gt.0 ) then
|
|
|
399 |
|
|
|
400 |
c Calculate layer pressures
|
|
|
401 |
if (leveltype.eq.'hybrid_sigma_pressure' ) then
|
|
|
402 |
do i=1,vardim(1)
|
|
|
403 |
do j=1,vardim(2)
|
|
|
404 |
do k=1,vardim(3)
|
|
|
405 |
tmp3(i,j,k)=aktmp(k)+bktmp(k)*tmp2(i,j)
|
|
|
406 |
enddo
|
|
|
407 |
enddo
|
|
|
408 |
enddo
|
|
|
409 |
elseif (leveltype.eq.'air_pressure' ) then
|
|
|
410 |
do i=1,vardim(1)
|
|
|
411 |
do j=1,vardim(2)
|
|
|
412 |
do k=1,vardim(3)
|
|
|
413 |
tmp3(i,j,k)=lev(k)
|
|
|
414 |
enddo
|
|
|
415 |
enddo
|
|
|
416 |
enddo
|
|
|
417 |
endif
|
|
|
418 |
|
|
|
419 |
c Get PS - close array on demand
|
|
|
420 |
do j=1,vardim(2)
|
|
|
421 |
do i=1,vardim(1)
|
|
|
422 |
ps(i,j) = tmp2(i,j)
|
|
|
423 |
enddo
|
|
|
424 |
if (closear.eq.1) ps(vardim(1)+1,j) = ps(1,j)
|
|
|
425 |
enddo
|
|
|
426 |
|
|
|
427 |
c Get P3 - close array on demand + vertical swap
|
|
|
428 |
do j=1,vardim(2)
|
|
|
429 |
do k=1,vardim(3)
|
|
|
430 |
do i=1,vardim(1)
|
|
|
431 |
if ( vertical_swap.eq.1 ) then
|
|
|
432 |
p3(i,j,k) = tmp3(i,j,vardim(3)-k+1)
|
|
|
433 |
else
|
|
|
434 |
p3(i,j,k) = tmp3(i,j,k)
|
|
|
435 |
endif
|
|
|
436 |
enddo
|
|
|
437 |
if (closear.eq.1) p3(vardim(1)+1,j,k) = p3(1,j,k)
|
|
|
438 |
enddo
|
|
|
439 |
enddo
|
|
|
440 |
|
|
|
441 |
c Get AK,BK - vertical swap on demand
|
|
|
442 |
if ( leveltype.eq.'hybrid_sigma_pressure' ) then
|
|
|
443 |
do k=1,vardim(3)
|
|
|
444 |
if ( vertical_swap.eq.1 ) then
|
|
|
445 |
ak(k) = aktmp(vardim(3)-k+1)
|
|
|
446 |
bk(k) = bktmp(vardim(3)-k+1)
|
|
|
447 |
else
|
|
|
448 |
ak(k) = aktmp(k)
|
|
|
449 |
bk(k) = bktmp(k)
|
|
|
450 |
endif
|
|
|
451 |
enddo
|
|
|
452 |
elseif (leveltype.eq.'air_pressure' ) then
|
|
|
453 |
do k=1,vardim(3)
|
|
|
454 |
if ( vertical_swap.eq.1 ) then
|
|
|
455 |
ak(k) = lev(vardim(3)-k+1)
|
|
|
456 |
bk(k) = 0.
|
|
|
457 |
else
|
|
|
458 |
ak(k) = lev(k)
|
|
|
459 |
bk(k) = 0.
|
|
|
460 |
endif
|
|
|
461 |
enddo
|
|
|
462 |
endif
|
|
|
463 |
|
|
|
464 |
endif
|
|
|
465 |
|
|
|
466 |
|
|
|
467 |
return
|
|
|
468 |
|
|
|
469 |
end
|
|
|
470 |
|
|
|
471 |
c ------------------------------------------------------------
|
|
|
472 |
c Read wind information
|
|
|
473 |
c ------------------------------------------------------------
|
|
|
474 |
|
|
|
475 |
subroutine input_wind (fid,fieldname,field,time,stagz,mdv,
|
|
|
476 |
> xmin,xmax,ymin,ymax,dx,dy,nx,ny,nz,
|
|
|
477 |
> timecheck)
|
|
|
478 |
|
|
|
479 |
c Read the wind component <fieldname> from the file with identifier
|
|
|
480 |
c <fid> and save it in the 3d array <field>. The vertical staggering
|
|
|
481 |
c information is provided in <stagz> and gives the reference to either
|
|
|
482 |
c the layer or level field from <input_grid>. A consistency check is
|
|
|
483 |
c performed to have an agreement with the grid specified by <xmin,xmax,
|
|
|
484 |
c ymin,ymax,dx,dy,nx,ny,nz>.
|
|
|
485 |
|
|
|
486 |
use netcdf
|
|
|
487 |
|
|
|
488 |
implicit none
|
|
|
489 |
|
|
|
490 |
c Declaration of variables and parameters
|
|
|
491 |
integer fid ! File identifier
|
|
|
492 |
character*80 fieldname ! Name of the wind field
|
|
|
493 |
integer nx,ny,nz ! Dimension of fields
|
|
|
494 |
real field(nx,ny,nz) ! 3d wind field
|
|
|
495 |
real stagz ! Staggering in the z direction
|
|
|
496 |
real mdv ! Missing data flag
|
|
|
497 |
real xmin,xmax,ymin,ymax ! Domain size
|
|
|
498 |
real dx,dy ! Horizontal resolution
|
|
|
499 |
real time ! Time
|
|
|
500 |
character*80 timecheck ! Either 'yes' or 'no'
|
|
|
501 |
|
|
|
502 |
c Numerical and physical parameters
|
|
|
503 |
real eps ! Numerical epsilon
|
|
|
504 |
parameter (eps=0.001)
|
|
|
505 |
real notimecheck ! 'Flag' for no time check
|
|
|
506 |
parameter (notimecheck=7.26537)
|
|
|
507 |
|
|
|
508 |
c Netcdf variables
|
|
|
509 |
integer ierr
|
|
|
510 |
character*80 varname
|
|
|
511 |
integer vardim(4)
|
|
|
512 |
real varmin(4),varmax(4)
|
|
|
513 |
real stag(4)
|
|
|
514 |
integer ndim
|
|
|
515 |
real times(10)
|
|
|
516 |
integer ntimes
|
|
|
517 |
character*80 cstfile
|
|
|
518 |
integer cstid
|
|
|
519 |
real aklay(200),bklay(200),aklev(200),bklev(200)
|
|
|
520 |
real ps(nx,ny)
|
|
|
521 |
integer dimids (nf90_max_var_dims)
|
|
|
522 |
character*80 dimname(nf90_max_var_dims)
|
|
|
523 |
integer varid
|
|
|
524 |
integer cdfid
|
|
|
525 |
real,allocatable, dimension (:) :: lon,lat,lev
|
|
|
526 |
real,allocatable, dimension (:,:) :: tmp2
|
|
|
527 |
real,allocatable, dimension (:,:,:) :: tmp3
|
|
|
528 |
real,allocatable, dimension (:) :: aktmp,bktmp
|
|
|
529 |
character*80 leveltype
|
|
|
530 |
integer vertical_swap
|
|
|
531 |
character*80 units
|
|
|
532 |
integer nakbktmp
|
|
|
533 |
integer dimid
|
|
|
534 |
|
|
|
535 |
c Auxiliary variables
|
|
|
536 |
integer isok
|
|
|
537 |
integer i,j,k
|
|
|
538 |
integer nz1
|
|
|
539 |
real rtime
|
|
|
540 |
integer closear
|
|
|
541 |
integer stat
|
|
|
542 |
real delta
|
|
|
543 |
integer pressure
|
|
|
544 |
|
|
|
545 |
c Init mdv
|
|
|
546 |
mdv = -999.
|
|
|
547 |
|
|
|
548 |
c Special handling if 3D pressure is
|
|
|
549 |
if ( fieldname.eq.'P' ) then
|
|
|
550 |
fieldname = 'U'
|
|
|
551 |
pressure = 1
|
|
|
552 |
else
|
|
|
553 |
pressure = 0
|
|
|
554 |
endif
|
|
|
555 |
|
|
|
556 |
c Get the number of dimensions -> ndim
|
|
|
557 |
ierr = NF90_INQ_VARID(fid,fieldname,varid)
|
|
|
558 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
559 |
ierr = nf90_inquire_variable(fid, varid, ndims = ndim)
|
|
|
560 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
561 |
|
|
|
562 |
c Get the dimensions of the arrays -> varid(1:ndim)
|
|
|
563 |
ierr = NF90_INQ_VARID(fid,fieldname,varid)
|
|
|
564 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
565 |
ierr = nf90_inquire_variable(fid, varid,
|
|
|
566 |
> dimids = dimids(1:ndim))
|
|
|
567 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
568 |
do i=1,ndim
|
|
|
569 |
ierr = nf90_inquire_dimension(fid, dimids(i),
|
|
|
570 |
> name = dimname(i) )
|
|
|
571 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
572 |
ierr = nf90_inquire_dimension(fid, dimids(i),len=vardim(i))
|
|
|
573 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
574 |
enddo
|
|
|
575 |
|
|
|
576 |
|
|
|
577 |
c Check whether the list of dimensions is OK
|
|
|
578 |
if (ndim .eq. 4) then
|
|
|
579 |
if ( ( dimname(1).ne.'lon' ).or.
|
|
|
580 |
> ( dimname(2).ne.'lat' ).or.
|
|
|
581 |
> ( dimname(3).ne.'lev' ).and.( dimname(3).ne.'lev_2' ).or.
|
|
|
582 |
> ( dimname(4).ne.'time' ) )
|
|
|
583 |
> then
|
|
|
584 |
print*,' ERROR: the dimensions of the variable are not correct'
|
|
|
585 |
print*,' expected -> lon / lat / lev / time'
|
|
|
586 |
print*, ( trim(dimname(i))//' / ',i=1,ndim )
|
|
|
587 |
stop
|
|
|
588 |
endif
|
|
|
589 |
else
|
|
|
590 |
if ( ( dimname(1).ne.'lon' ).or.
|
|
|
591 |
> ( dimname(2).ne.'lat' ).or.
|
|
|
592 |
> ( dimname(3).ne.'time' ) )
|
|
|
593 |
> then
|
|
|
594 |
print*,' ERROR: the dimensions of the variable are not correct'
|
|
|
595 |
print*,' expected -> lon / lat / time'
|
|
|
596 |
print*, ( trim(dimname(i))//' / ',i=1,ndim )
|
|
|
597 |
stop
|
|
|
598 |
endif
|
|
|
599 |
end if
|
|
|
600 |
|
|
|
601 |
c Check about the type of vertical levels
|
|
|
602 |
if (ndim .eq. 4) then
|
|
|
603 |
|
|
|
604 |
c Get dimension of AK,BK
|
|
|
605 |
varname = 'nhym'
|
|
|
606 |
ierr = NF90_INQ_DIMID(fid,varname,dimid)
|
|
|
607 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
608 |
ierr = nf90_inquire_dimension(fid, dimid,len=nakbktmp)
|
|
|
609 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
610 |
|
|
|
611 |
varname=dimname(3)
|
|
|
612 |
ierr = NF90_INQ_VARID(fid,varname,varid)
|
|
|
613 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
614 |
ierr = nf90_get_att(fid, varid, "standard_name", leveltype)
|
|
|
615 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
616 |
if ( (leveltype.ne.'hybrid_sigma_pressure').and.
|
|
|
617 |
> (leveltype.ne.'air_pressure' ) ) then
|
|
|
618 |
print*,' ERROR: input netCDF data must be on hybrid-sigma'
|
|
|
619 |
print*,' or air pressure levels!',trim(leveltype)
|
|
|
620 |
stop
|
|
|
621 |
endif
|
|
|
622 |
else
|
|
|
623 |
leveltype='air_pressure'
|
|
|
624 |
endif
|
|
|
625 |
|
|
|
626 |
c Allocate memory for reading arrays - depending on <closear>
|
|
|
627 |
allocate(tmp2(vardim(1),vardim(2)),stat=stat)
|
|
|
628 |
if (stat.ne.0) print*,'*** error allocating array tmp2 ***'
|
|
|
629 |
allocate(tmp3(vardim(1),vardim(2),vardim(3)),stat=stat)
|
|
|
630 |
if (stat.ne.0) print*,'*** error allocating array tmp3 ***'
|
|
|
631 |
allocate(lon(vardim(1)),stat=stat)
|
|
|
632 |
if (stat.ne.0) print*,'*** error allocating array lon ***'
|
|
|
633 |
allocate(lat(vardim(2)),stat=stat)
|
|
|
634 |
if (stat.ne.0) print*,'*** error allocating array lat ***'
|
|
|
635 |
allocate(lev(vardim(3)),stat=stat)
|
|
|
636 |
if (stat.ne.0) print*,'*** error allocating array lev ***'
|
|
|
637 |
if (ndim .eq. 4) then
|
|
|
638 |
allocate(aktmp(nakbktmp),stat=stat)
|
|
|
639 |
if (stat.ne.0) print*,'*** error allocating array aktmp ***'
|
|
|
640 |
allocate(bktmp(nakbktmp),stat=stat)
|
|
|
641 |
if (stat.ne.0) print*,'*** error allocating array bktmp ***'
|
|
|
642 |
end if
|
|
|
643 |
|
|
|
644 |
c Get domain boundaries - longitude, latitude, levels
|
|
|
645 |
varname = dimname(1)
|
|
|
646 |
ierr = NF90_INQ_VARID(fid,varname,varid)
|
|
|
647 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
648 |
ierr = nf90_get_var(fid,varid,lon)
|
|
|
649 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
650 |
varname = dimname(2)
|
|
|
651 |
ierr = NF90_INQ_VARID(fid,varname,varid)
|
|
|
652 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
653 |
ierr = nf90_get_var(fid,varid,lat)
|
|
|
654 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
655 |
varname = dimname(3)
|
|
|
656 |
ierr = NF90_INQ_VARID(fid,varname,varid)
|
|
|
657 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
658 |
ierr = nf90_get_var(fid,varid,lev)
|
|
|
659 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
660 |
varmin(1) = lon(1)
|
|
|
661 |
varmax(1) = lon( vardim(1) )
|
|
|
662 |
varmin(2) = lat(1)
|
|
|
663 |
varmax(2) = lat( vardim(2) )
|
|
|
664 |
|
|
|
665 |
c Get ak and bk
|
|
|
666 |
if (ndim .eq. 4) then
|
|
|
667 |
varname='hyam'
|
|
|
668 |
ierr = NF90_INQ_VARID(fid,varname,varid)
|
|
|
669 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
670 |
ierr = nf90_get_var(fid,varid,aktmp)
|
|
|
671 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
672 |
varname='hybm'
|
|
|
673 |
ierr = NF90_INQ_VARID(fid,varname,varid)
|
|
|
674 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
675 |
ierr = nf90_get_var(fid,varid,bktmp)
|
|
|
676 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
677 |
|
|
|
678 |
c Check that unit of ak is in hPa - if necessary correct it
|
|
|
679 |
varname='hyam'
|
|
|
680 |
ierr = NF90_INQ_VARID(fid,varname,varid)
|
|
|
681 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
682 |
ierr = nf90_get_att(fid, varid, "units", units)
|
|
|
683 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
684 |
if ( units.eq.'Pa' ) then
|
|
|
685 |
do k=1,nakbktmp
|
|
|
686 |
aktmp(k) = 0.01 * aktmp(k)
|
|
|
687 |
enddo
|
|
|
688 |
endif
|
|
|
689 |
end if
|
|
|
690 |
|
|
|
691 |
c Check that unit of lev is in hPa - if necessary correct it
|
|
|
692 |
if ( leveltype.eq.'air_pressure' .and. vardim(3) .gt. 1) then
|
|
|
693 |
varname='lev'
|
|
|
694 |
ierr = NF90_INQ_VARID(fid,varname,varid)
|
|
|
695 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
696 |
ierr = nf90_get_att(fid, varid, "units", units)
|
|
|
697 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
698 |
if ( units.eq.'Pa' ) then
|
|
|
699 |
do k=1,vardim(3)
|
|
|
700 |
lev(k) = 0.01 * lev(k)
|
|
|
701 |
enddo
|
|
|
702 |
endif
|
|
|
703 |
endif
|
|
|
704 |
|
|
|
705 |
c Decide whether to swap vertical levels
|
|
|
706 |
vertical_swap = 1
|
|
|
707 |
if ( leveltype.eq.'hybrid_sigma_pressure') then
|
|
|
708 |
if ( (aktmp(1) + bktmp(1) * 1000.).gt.
|
|
|
709 |
> (aktmp(2) + bktmp(2) * 1000.) )
|
|
|
710 |
> then
|
|
|
711 |
vertical_swap = 0
|
|
|
712 |
endif
|
|
|
713 |
elseif ( leveltype.eq.'air_pressure') then
|
|
|
714 |
if ( lev(1).gt.lev(2) ) then
|
|
|
715 |
vertical_swap = 0
|
|
|
716 |
endif
|
|
|
717 |
endif
|
|
|
718 |
|
|
|
719 |
c Read data /or set 3D pressure field)
|
|
|
720 |
if ( pressure.eq.0 ) then
|
|
|
721 |
ierr = NF90_INQ_VARID(fid,fieldname,varid)
|
|
|
722 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
723 |
ierr = nf90_get_var(fid,varid,tmp3)
|
|
|
724 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
725 |
else
|
|
|
726 |
if (leveltype.eq.'hybrid_sigma_pressure' ) then
|
|
|
727 |
do i=1,vardim(1)
|
|
|
728 |
do j=1,vardim(2)
|
|
|
729 |
do k=1,vardim(3)
|
|
|
730 |
tmp3(i,j,k)=aktmp(k)+bktmp(k)*tmp2(i,j)
|
|
|
731 |
enddo
|
|
|
732 |
enddo
|
|
|
733 |
enddo
|
|
|
734 |
elseif (leveltype.eq.'air_pressure' ) then
|
|
|
735 |
do i=1,vardim(1)
|
|
|
736 |
do j=1,vardim(2)
|
|
|
737 |
do k=1,vardim(3)
|
|
|
738 |
tmp3(i,j,k)=lev(k)
|
|
|
739 |
enddo
|
|
|
740 |
enddo
|
|
|
741 |
enddo
|
|
|
742 |
endif
|
|
|
743 |
endif
|
|
|
744 |
|
|
|
745 |
c If the field is 2D, expand it to 3D - simple handling of 2D tracing
|
|
|
746 |
c if ( vardim(3).eq.1 ) then
|
|
|
747 |
c do i=1,vardim(1)
|
|
|
748 |
c do j=1,vardim(2)
|
|
|
749 |
c do k=1,vardim(3)
|
|
|
750 |
c tmp3(i,j,k) = tmp3(i,j,1)
|
|
|
751 |
c enddo
|
|
|
752 |
c enddo
|
|
|
753 |
c enddo
|
|
|
754 |
c endif
|
|
|
755 |
|
|
|
756 |
c Decide whether to close arrays
|
|
|
757 |
delta = varmax(1)-varmin(1)-360.
|
|
|
758 |
if (abs(delta+dx).lt.eps) then
|
|
|
759 |
closear = 1
|
|
|
760 |
else
|
|
|
761 |
closear = 0
|
|
|
762 |
endif
|
|
|
763 |
|
|
|
764 |
c Save output array - close array and swap on demand
|
|
|
765 |
|
|
|
766 |
do j=1,vardim(2)
|
|
|
767 |
do k=1,nz
|
|
|
768 |
do i=1,vardim(1)
|
|
|
769 |
if (ndim .eq. 4) then
|
|
|
770 |
if ( vertical_swap.eq.1 ) then
|
|
|
771 |
field(i,j,k) = tmp3(i,j,vardim(3)-k+1)
|
|
|
772 |
else
|
|
|
773 |
field(i,j,k) = tmp3(i,j,k)
|
|
|
774 |
endif
|
|
|
775 |
else
|
|
|
776 |
field(i,j,k) = tmp3(i,j,1)
|
|
|
777 |
endif
|
|
|
778 |
enddo
|
|
|
779 |
if (closear.eq.1) field(vardim(1)+1,j,k) = field(1,j,k)
|
|
|
780 |
enddo
|
|
|
781 |
enddo
|
|
|
782 |
|
|
|
783 |
c Exit point
|
|
|
784 |
return
|
|
|
785 |
|
|
|
786 |
end
|
|
|
787 |
|
|
|
788 |
|
|
|
789 |
c ------------------------------------------------------------
|
|
|
790 |
c Close input file
|
|
|
791 |
c ------------------------------------------------------------
|
|
|
792 |
|
|
|
793 |
subroutine input_close(fid)
|
|
|
794 |
|
|
|
795 |
c Close the input file with file identifier <fid>.
|
|
|
796 |
|
|
|
797 |
use netcdf
|
|
|
798 |
|
|
|
799 |
implicit none
|
|
|
800 |
|
|
|
801 |
c Declaration of subroutine parameters
|
|
|
802 |
integer fid
|
|
|
803 |
|
|
|
804 |
c Auxiliary variables
|
|
|
805 |
integer ierr
|
|
|
806 |
|
|
|
807 |
c Close file
|
|
|
808 |
ierr = NF90_CLOSE(fid)
|
|
|
809 |
IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
810 |
|
|
|
811 |
end
|
|
|
812 |
|
|
|
813 |
c ------------------------------------------------------------
|
|
|
814 |
c Get a list of variables on netCDF file
|
|
|
815 |
c ------------------------------------------------------------
|
|
|
816 |
|
|
|
817 |
subroutine input_getvars(fid,vnam,nvars)
|
|
|
818 |
|
|
|
819 |
c List of variables on netCDF file
|
|
|
820 |
|
|
|
821 |
use netcdf
|
|
|
822 |
|
|
|
823 |
implicit none
|
|
|
824 |
|
|
|
825 |
c Declaration of subroutine parameters
|
|
|
826 |
integer fid
|
|
|
827 |
integer nvars
|
|
|
828 |
character*80 vnam(200)
|
|
|
829 |
|
|
|
830 |
c Auxiliary variables
|
|
|
831 |
integer ierr
|
|
|
832 |
integer i
|
|
|
833 |
integer nDims,nGlobalAtts,unlimdimid
|
|
|
834 |
|
|
|
835 |
ierr = nf90_inquire(fid, nDims, nVars, nGlobalAtts, unlimdimid)
|
|
|
836 |
IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
837 |
|
|
|
838 |
do i=1,nVars
|
|
|
839 |
ierr = nf90_inquire_variable(fid, i, name = vnam(i))
|
|
|
840 |
enddo
|
|
|
841 |
|
|
|
842 |
end
|