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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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michaesp |
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use netcdf
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michaesp |
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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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michaesp |
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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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michaesp |
49 |
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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michaesp |
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use netcdf
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michaesp |
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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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michaesp |
107 |
real times
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michaesp |
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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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michaesp |
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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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michaesp |
114 |
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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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michaesp |
122 |
integer varid
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integer cdfid
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michaesp |
124 |
real rmax,rmin
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michaesp |
125 |
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michaesp |
126 |
c Set file identifier
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michaesp |
127 |
if (fid.lt.0) then
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michaesp |
128 |
cdfid = -fid
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else
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cdfid = fid
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endif
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c Get varid
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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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c Get numebr of dimensions -> ndim
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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 Get dim IDs
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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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michaesp |
145 |
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michaesp |
146 |
c Get dimensions -> vardim(1:ndim)
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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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151 |
ierr = nf90_inquire_dimension(cdfid, dimids(i),len=vardim(i))
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152 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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153 |
enddo
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154 |
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c Get domain min -> varmin(1:3)
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156 |
ierr = nf90_get_att(cdfid, varid, "xmin", varmin(1))
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157 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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158 |
ierr = nf90_get_att(cdfid, varid, "ymin", varmin(2))
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159 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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160 |
ierr = nf90_get_att(cdfid, varid, "zmin", varmin(3))
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161 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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162 |
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c Get domain max -> varmax(1:3)
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164 |
ierr = nf90_get_att(cdfid, varid, "xmax", varmax(1))
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165 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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166 |
ierr = nf90_get_att(cdfid, varid, "ymax", varmax(2))
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167 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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168 |
ierr = nf90_get_att(cdfid, varid, "zmax", varmax(3))
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169 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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170 |
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c Get vertical staggering -> stagz
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ierr = nf90_get_att(cdfid, varid, "zstag", stagz)
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173 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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c Get missing data value -> mdv
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ierr = nf90_get_att(cdfid, varid, "missing_value", mdv)
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177 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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michaesp |
178 |
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michaesp |
179 |
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 = varmin(1)
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ymin = varmin(2)
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xmax = varmax(1)
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186 |
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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michaesp |
189 |
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michaesp |
190 |
c We want the longitudes within -180 ... + 180
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191 |
if ( xmin.lt.-180.) then
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michaesp |
192 |
xmin = xmin + 360.
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xmax = xmax + 360.
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michaesp |
194 |
else if ( xmax.gt.360. ) then
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michaesp |
195 |
xmin = xmin - 360.
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xmax = xmax - 360.
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michaesp |
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endif
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michaesp |
198 |
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michaesp |
199 |
c Get name of constants file -> cstfile
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ierr = nf90_get_att(cdfid,nf90_global,
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> "constants_file_name ", cstfile )
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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michaesp |
203 |
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michaesp |
204 |
c Get pole position from constants file
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ierr = NF90_OPEN(TRIM(cstfile),nf90_nowrite, cstid)
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IF ( ierr /= nf90_NoErr ) PRINT *,NF90_STRERROR(ierr)
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varname='pollon'
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208 |
ierr = NF90_INQ_VARID(cstid,varname,varid)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = nf90_get_var(cstid,varid,pollon)
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211 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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varname='pollat'
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ierr = NF90_INQ_VARID(cstid,varname,varid)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = nf90_get_var(cstid,varid,pollat)
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216 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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217 |
ierr = NF90_CLOSE(cstid)
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218 |
IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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219 |
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c Skip the rest if fid < 0:
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if ( fid.lt.0 ) goto 900
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c Get ak and bk from constants file
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224 |
ierr = NF90_OPEN(TRIM(cstfile),nf90_nowrite, cstid)
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225 |
IF ( ierr /= nf90_NoErr ) PRINT *,NF90_STRERROR(ierr)
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226 |
varname='aklev'
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227 |
ierr = NF90_INQ_VARID(cstid,varname,varid)
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228 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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229 |
ierr = nf90_get_var(cstid,varid,aklev)
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230 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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varname='bklev'
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ierr = NF90_INQ_VARID(cstid,varname,varid)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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234 |
ierr = nf90_get_var(cstid,varid,bklev)
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235 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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varname='aklay'
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237 |
ierr = NF90_INQ_VARID(cstid,varname,varid)
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238 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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239 |
ierr = nf90_get_var(cstid,varid,aklay)
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240 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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241 |
varname='bklay'
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242 |
ierr = NF90_INQ_VARID(cstid,varname,varid)
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243 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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244 |
ierr = nf90_get_var(cstid,varid,bklay)
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IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = NF90_CLOSE(cstid)
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247 |
IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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248 |
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c print*,'AKLEV : '
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c print*, (aklev(i),i=1,20)
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c print*,'BKLEV : '
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c print*,(bklev(i),i=1,20)
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c print*,'AKLAY : '
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c print*,(aklay(i),i=1,20)
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255 |
c print*,'BKLAY : '
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c print*,(bklay(i),i=1,20)
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c Get time information (check if time is correct)
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259 |
varname = 'time'
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260 |
ierr = NF90_INQ_VARID(cdfid,varname,varid)
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261 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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262 |
ierr = nf90_get_var(cdfid,varid,times)
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263 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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264 |
isok=0
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265 |
if (abs(time-times).lt.eps) then
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michaesp |
266 |
isok = 1
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michaesp |
267 |
rtime = times
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268 |
elseif (timecheck.eq.'no') then
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michaesp |
269 |
isok = 1
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michaesp |
270 |
rtime = times
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271 |
endif
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272 |
if ( isok.eq.0 ) then
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273 |
print*,' ERROR: time ',rtime,' not found on netCDF file'
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274 |
stop
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275 |
endif
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276 |
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277 |
c print*,'TIME : ',rtime
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michaesp |
278 |
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michaesp |
279 |
c Read surface pressure
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280 |
varname='PS'
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281 |
ierr = NF90_INQ_VARID(cdfid,varname,varid)
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282 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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283 |
ierr = nf90_get_var(cdfid,varid,ps)
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284 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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michaesp |
285 |
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286 |
c Check that PS is in hPa - quick and dirty
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287 |
rmax = -1.e9
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288 |
rmin = +1.e9
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289 |
do i=1,nx
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290 |
do j=1,ny
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291 |
if ( (ps(i,j).gt.rmax).and.abs(ps(i,j)-mdv).gt.eps) then
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292 |
rmax = ps(i,j)
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293 |
endif
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294 |
if ( (ps(i,j).lt.rmin).and.abs(ps(i,j)-mdv).gt.eps) then
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295 |
rmin = ps(i,j)
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296 |
endif
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297 |
enddo
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298 |
enddo
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299 |
if ( (rmin.lt.200.).or.(rmax.gt.1500.) ) then
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300 |
print*,' ERROR: PS must be in hPa... Stop'
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301 |
stop
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302 |
endif
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| 7 |
michaesp |
303 |
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304 |
c Calculate layer and level pressures
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305 |
do i=1,nx
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306 |
do j=1,ny
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| 3 |
michaesp |
307 |
do k=1,nz
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|
308 |
if ( abs(stagz).lt.eps ) then
|
|
|
309 |
p3(i,j,k)=aklev(k)+bklev(k)*ps(i,j)
|
|
|
310 |
else
|
|
|
311 |
p3(i,j,k)=aklay(k)+bklay(k)*ps(i,j)
|
|
|
312 |
endif
|
|
|
313 |
enddo
|
|
|
314 |
enddo
|
| 7 |
michaesp |
315 |
enddo
|
| 3 |
michaesp |
316 |
|
| 7 |
michaesp |
317 |
c Set the ak and bk for the vertical grid
|
|
|
318 |
do k=1,nz
|
| 3 |
michaesp |
319 |
if ( abs(stagz).lt.eps ) then
|
|
|
320 |
ak(k)=aklev(k)
|
|
|
321 |
bk(k)=bklev(k)
|
|
|
322 |
else
|
|
|
323 |
ak(k)=aklay(k)
|
|
|
324 |
bk(k)=bklay(k)
|
|
|
325 |
endif
|
| 7 |
michaesp |
326 |
enddo
|
| 3 |
michaesp |
327 |
|
| 7 |
michaesp |
328 |
c Exit point
|
|
|
329 |
900 continue
|
|
|
330 |
|
| 3 |
michaesp |
331 |
return
|
|
|
332 |
|
|
|
333 |
end
|
|
|
334 |
|
|
|
335 |
c ------------------------------------------------------------
|
|
|
336 |
c Read wind information
|
|
|
337 |
c ------------------------------------------------------------
|
|
|
338 |
|
|
|
339 |
subroutine input_wind (fid,fieldname,field,time,stagz,mdv,
|
|
|
340 |
> xmin,xmax,ymin,ymax,dx,dy,nx,ny,nz,
|
|
|
341 |
> timecheck)
|
|
|
342 |
|
|
|
343 |
c Read the wind component <fieldname> from the file with identifier
|
|
|
344 |
c <fid> and save it in the 3d array <field>. The vertical staggering
|
|
|
345 |
c information is provided in <stagz> and gives the reference to either
|
|
|
346 |
c the layer or level field from <input_grid>. A consistency check is
|
|
|
347 |
c performed to have an agreement with the grid specified by <xmin,xmax,
|
|
|
348 |
c ymin,ymax,dx,dy,nx,ny,nz>.
|
|
|
349 |
|
| 7 |
michaesp |
350 |
use netcdf
|
|
|
351 |
|
| 3 |
michaesp |
352 |
implicit none
|
|
|
353 |
|
|
|
354 |
c Declaration of variables and parameters
|
|
|
355 |
integer fid ! File identifier
|
|
|
356 |
character*80 fieldname ! Name of the wind field
|
|
|
357 |
integer nx,ny,nz ! Dimension of fields
|
|
|
358 |
real field(nx,ny,nz) ! 3d wind field
|
|
|
359 |
real stagz ! Staggering in the z direction
|
|
|
360 |
real mdv ! Missing data flag
|
|
|
361 |
real xmin,xmax,ymin,ymax ! Domain size
|
|
|
362 |
real dx,dy ! Horizontal resolution
|
|
|
363 |
real time ! Time
|
|
|
364 |
character*80 timecheck ! Either 'yes' or 'no'
|
|
|
365 |
|
|
|
366 |
c Numerical and physical parameters
|
|
|
367 |
real eps ! Numerical epsilon
|
|
|
368 |
parameter (eps=0.001)
|
|
|
369 |
real notimecheck ! 'Flag' for no time check
|
|
|
370 |
parameter (notimecheck=7.26537)
|
|
|
371 |
|
|
|
372 |
c Netcdf variables
|
|
|
373 |
integer ierr
|
|
|
374 |
character*80 varname
|
|
|
375 |
integer vardim(4)
|
|
|
376 |
real varmin(4),varmax(4)
|
|
|
377 |
real stag(4)
|
|
|
378 |
integer ndim
|
|
|
379 |
real times(10)
|
|
|
380 |
integer ntimes
|
|
|
381 |
character*80 cstfile
|
|
|
382 |
integer cstid
|
|
|
383 |
real aklay(200),bklay(200),aklev(200),bklev(200)
|
|
|
384 |
real ps(nx,ny)
|
| 7 |
michaesp |
385 |
integer dimids (nf90_max_var_dims)
|
|
|
386 |
character*80 dimname(nf90_max_var_dims)
|
|
|
387 |
integer varid
|
|
|
388 |
integer cdfid
|
| 3 |
michaesp |
389 |
|
|
|
390 |
c Auxiliary variables
|
|
|
391 |
integer isok
|
|
|
392 |
integer i,j,k
|
|
|
393 |
integer nz1
|
|
|
394 |
real rtime
|
|
|
395 |
|
| 7 |
michaesp |
396 |
c Get varid
|
|
|
397 |
ierr = NF90_INQ_VARID(fid,fieldname,varid)
|
|
|
398 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
399 |
|
|
|
400 |
c Get number of vertical levels -> vardim(3)
|
|
|
401 |
ierr = nf90_inquire_variable(fid, varid, ndims = ndim)
|
|
|
402 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
403 |
ierr = nf90_inquire_variable(fid, varid,
|
|
|
404 |
> dimids = dimids(1:ndim))
|
|
|
405 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
406 |
do i=1,ndim
|
|
|
407 |
ierr = nf90_inquire_dimension(fid, dimids(i),
|
|
|
408 |
> name = dimname(i) )
|
|
|
409 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
410 |
ierr = nf90_inquire_dimension(fid, dimids(i),len=vardim(i))
|
|
|
411 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
| 3 |
michaesp |
412 |
enddo
|
|
|
413 |
|
| 7 |
michaesp |
414 |
c Read data
|
|
|
415 |
varname=fieldname
|
|
|
416 |
ierr = nf90_get_var(fid,varid,field)
|
|
|
417 |
IF(ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
418 |
|
| 3 |
michaesp |
419 |
c If the field is 2D, expand it to 3D - simple handling of 2D tracing
|
|
|
420 |
if ( vardim(3).eq.1 ) then
|
|
|
421 |
do i=1,nx
|
|
|
422 |
do j=1,ny
|
|
|
423 |
do k=1,nz
|
|
|
424 |
field(i,j,k) = field(i,j,1)
|
|
|
425 |
enddo
|
|
|
426 |
enddo
|
|
|
427 |
enddo
|
|
|
428 |
endif
|
|
|
429 |
|
| 7 |
michaesp |
430 |
c Exit point
|
| 3 |
michaesp |
431 |
return
|
| 7 |
michaesp |
432 |
|
| 3 |
michaesp |
433 |
end
|
|
|
434 |
|
|
|
435 |
c ------------------------------------------------------------
|
|
|
436 |
c Close input file
|
|
|
437 |
c ------------------------------------------------------------
|
|
|
438 |
|
|
|
439 |
subroutine input_close(fid)
|
|
|
440 |
|
|
|
441 |
c Close the input file with file identifier <fid>.
|
|
|
442 |
|
| 7 |
michaesp |
443 |
use netcdf
|
|
|
444 |
|
| 3 |
michaesp |
445 |
implicit none
|
|
|
446 |
|
|
|
447 |
c Declaration of subroutine parameters
|
|
|
448 |
integer fid
|
|
|
449 |
|
|
|
450 |
c Auxiliary variables
|
|
|
451 |
integer ierr
|
|
|
452 |
|
|
|
453 |
c Close file
|
| 7 |
michaesp |
454 |
ierr = NF90_CLOSE(fid)
|
|
|
455 |
IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
456 |
|
| 3 |
michaesp |
457 |
end
|