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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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ierr = NF90_OPEN(TRIM(filename),nf90_nowrite, fid)
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IF ( ierr /= nf90_NoErr ) PRINT *,NF90_STRERROR(ierr)
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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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use netcdf
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c Read grid information at <time> from file with identifier <fid>.
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c The horizontal grid is characterized by <xmin,xmax,ymin,ymax,dx,dy>
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c with pole position at <pollon,pollat> and grid dimension <nx,ny>.
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c The 3d arrays <p3(nx,ny,nz)> gives the vertical coordinates, either
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c on the staggered or unstaggered grid (with <stagz> as the flag).
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c The surface pressure is given in <ps(nx,ny)>. If <fid> is negative,
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c only the grid dimensions and grid parameters (xmin...pollat,nz) are
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c determined and returned (this is needed for dynamical allocation of
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c memory).
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implicit none
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c Declaration of subroutine parameters
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integer fid ! File identifier
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real xmin,xmax,ymin,ymax ! Domain size
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real dx,dy ! Horizontal resolution
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integer nx,ny,nz ! Grid dimensions
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real pollon,pollat ! Longitude and latitude of pole
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real p3(nx,ny,nz) ! Staggered levels
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real ps(nx,ny) ! Surface pressure
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real time ! Time of the grid information
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real ak(nz),bk(nz) ! Ak and Bk for layers or levels
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real stagz ! Vertical staggering (0 or -0.5)
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character*80 fieldname ! Variable from which to take grid info
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character*80 timecheck ! Either 'yes' or 'no'
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c Numerical epsilon
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real eps
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parameter (eps=0.0001)
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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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character*80 varname
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character*80 newname
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real lon(1000),lat(1000),lev(1000),lev2(1000)
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integer varid,lonid,latid,levid
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integer nz2
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real tmp(nx-1,ny)
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integer indx
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real lon1
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integer itmp
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c Inquire dimensions and grid constants if <fid> is negative
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if (fid.lt.0) then
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c Longitude
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ierr = nf90_inq_dimid(-fid,'lon', lonid)
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = nf90_inquire_dimension(-fid, lonid, len = nx)
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = NF90_INQ_VARID(-fid,'lon',varid)
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = NF90_GET_VAR(-fid,varid,lon(1:nx))
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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c Latitude
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ierr = nf90_inq_dimid(-fid,'lat', latid)
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = nf90_inquire_dimension(-fid, latid, len = ny)
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = NF90_INQ_VARID(-fid,'lat',varid)
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = NF90_GET_VAR(-fid,varid,lat(1:ny))
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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c Set grid parameters and compare to expected setting
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xmin = lon(1)
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xmax = lon(nx)
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ymin = lat(ny)
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ymax = lat(1)
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dx = (xmax-xmin)/real(nx-1)
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dy = (ymax-ymin)/real(ny-1)
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if (
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> ( nx .ne.180 ).or.
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> ( ny .ne.91 ).or.
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> ( abs(xmin - 0.).gt.eps ).or.
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> ( abs(xmax - 358.).gt.eps ).or.
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> ( abs(ymin + 90.).gt.eps ).or.
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> ( abs(ymax - 90.).gt.eps ).or.
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> ( abs(dx - 2.).gt.eps ).or.
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> ( abs(dy - 2.).gt.eps ) )
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> then
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print*,' ERROR: grid does not agree with expectation.. Stop'
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stop
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endif
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c Vertical levels
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ierr = nf90_inq_dimid(-fid,'level', levid)
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = nf90_inquire_dimension(-fid, levid, len = nz)
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = NF90_INQ_VARID(-fid,'level',varid)
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = NF90_GET_VAR(-fid,varid,lev(1:nz))
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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c Get vertical levels for omega and check consistence
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ierr = nf90_inq_dimid(-fid,'level_2', levid)
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = nf90_inquire_dimension(-fid, levid, len = nz2)
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = NF90_INQ_VARID(-fid,'level_2',varid)
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = NF90_GET_VAR(-fid,varid,lev2(1:nz2))
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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if (nz.gt.nz2 ) then
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itmp = nz
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nz = nz2
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nz2 = itmp
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endif
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if ( ( nz.ne.19 ).or.(nz2.ne.24) ) then
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print*,' ERROR: grid inconsitence... level vs level_2'
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print*,'nz,nz2 ',nz,nz2
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stop
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endif
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do i=1,nz
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if ( abs( lev2(i)-lev(i) ).gt.eps ) then
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print*,' ERROR: grid inconsitence... level vs level_2'
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print*,i,lev2(i),lev(i)
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stop
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endif
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enddo
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c Set the final (expected) parameters, including closing and shifting
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nx = 181
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ny = 91
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nz = 19
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xmin = -180.
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xmax = 180.
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ymin = -90.
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ymax = 90.
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dx = 2.
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dy = 2.
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pollon = 0.
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pollat = 90.
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stagz = 0.
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c Get non-constant grid parameters (surface pressure and vertical grid)
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else
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c Set 3D pressure
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ierr = NF90_INQ_VARID(fid,'level_2',varid)
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = NF90_GET_VAR(fid,varid,lev(1:nz))
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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do i=1,nx
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do j=1,ny
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do k=1,nz
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p3(i,j,k) = lev(k)
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enddo
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enddo
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enddo
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c Set ak, bk
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do k=1,nz
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ak(k) = lev(k)
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bk(k) = 0.
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enddo
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c Read surface pressure (close and shift/swap domain; unit conversion)
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varname = 'pres'
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ierr = NF90_INQ_VARID(fid,varname,varid)
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = NF90_GET_VAR(fid,varid,tmp(1:(nx-1),1:ny))
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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do i=1,nx-1
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lon1 = xmin + real(i-1)*dx
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if ( lon1.lt.-eps ) lon1 = lon1 + 360.
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indx = nint( lon1 / dx + 1. )
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do j=1,ny
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ps(i,j) = 0.01 * tmp(indx,ny-j+1)
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enddo
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enddo
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do j=1,ny
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ps(nx,j) = ps(1,j)
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enddo
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endif
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end
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c ------------------------------------------------------------
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c Read wind and other met field
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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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use netcdf
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c Read the wind component <fieldname> from the file with identifier
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c <fid> and save it in the 3d array <field>. The vertical staggering
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c information is provided in <stagz> and gives the reference to either
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c the layer or level field from <input_grid>. A consistency check is
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c performed to have an agreement with the grid specified by <xmin,xmax,
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c ymin,ymax,dx,dy,nx,ny,nz>.
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implicit none
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c Declaration of variables and parameters
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integer fid ! File identifier
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character*80 fieldname ! Name of the wind field
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integer nx,ny,nz ! Dimension of fields
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real field(nx,ny,nz) ! 3d wind field
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real stagz ! Staggering in the z direction
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real mdv ! Missing data flag
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real xmin,xmax,ymin,ymax ! Domain size
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real dx,dy ! Horizontal resolution
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real time ! Time
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character*80 timecheck ! Either 'yes' or 'no'
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c Netcdf variables
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integer ierr
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character*80 varname
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character*80 newname
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c Numerical epsilon
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real eps
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parameter (eps=0.0001)
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c Auxiliary variables
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integer i,j,k
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real lev(1000)
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integer varid
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real tmp(nx-1,ny,nz)
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real lon(nx-1)
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integer indx
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real lon1
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integer is2d
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c Set the correct fieldname
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newname = fieldname
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if ( fieldname.eq.'PLEV' ) newname='P'
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if ( fieldname.eq.'PLAY' ) newname='P'
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if ( fieldname.eq.'P' ) newname='P'
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if ( fieldname.eq.'OMEGA' ) newname='omega'
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if ( fieldname.eq.'PS' ) newname='pres'
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if ( fieldname.eq.'U' ) newname='uwnd'
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if ( fieldname.eq.'V' ) newname='vwnd'
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c Get flag for 2D field
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is2d = 0
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if ( fieldname.eq.'pres' ) is2d = 1
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c Get 3D pressure
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if ( fieldname.eq.'P' ) then
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varname = 'level'
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ierr = NF90_INQ_VARID(fid,varname,varid)
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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ierr = NF90_GET_VAR(fid,varid,lev(1:nz))
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IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
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do i=1,nx
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do j=1,ny
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do k=1,nz
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field(i,j,k) = lev(k)
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enddo
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enddo
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enddo
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mdv = -9.96921e+36
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c Get 3D field (close and shift/swap domain)
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elseif ( is2d.eq.0 ) then
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varname = newname
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ierr = NF90_INQ_VARID(fid,varname,varid)
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336 |
IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
337 |
ierr = NF90_GET_VAR(fid,varid,tmp(1:(nx-1),1:ny,1:nz))
|
|
|
338 |
IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
339 |
ierr = nf90_get_att(fid, varid, "_FillValue", mdv)
|
|
|
340 |
IF (ierr /= nf90_NoErr) THEN
|
|
|
341 |
mdv = -9.96921e+36
|
|
|
342 |
ierr = nf90_NoErr
|
|
|
343 |
ENDIF
|
|
|
344 |
|
|
|
345 |
do i=1,nx-1
|
|
|
346 |
lon1 = xmin + real(i-1)*dx
|
|
|
347 |
if ( lon1.lt.-eps ) lon1 = lon1 + 360.
|
|
|
348 |
indx = nint( lon1 / dx + 1. )
|
|
|
349 |
do k=1,nz
|
|
|
350 |
do j=1,ny
|
|
|
351 |
field(i,j,k) = tmp(indx,ny-j+1,k)
|
|
|
352 |
enddo
|
|
|
353 |
field(nx,j,k) = field(1,j,k)
|
|
|
354 |
enddo
|
|
|
355 |
enddo
|
|
|
356 |
|
|
|
357 |
c Get 2D field (close and shift/swap domain)
|
|
|
358 |
elseif ( is2d.eq.1 ) then
|
|
|
359 |
|
|
|
360 |
varname = newname
|
|
|
361 |
ierr = NF90_INQ_VARID(fid,varname,varid)
|
|
|
362 |
IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
363 |
ierr = NF90_GET_VAR(fid,varid,tmp(1:(nx-1),1:ny,1:1))
|
|
|
364 |
IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
365 |
ierr = nf90_get_att(fid, varid, "_FillValue", mdv)
|
|
|
366 |
IF (ierr /= nf90_NoErr) THEN
|
|
|
367 |
mdv = -9.96921e+36
|
|
|
368 |
ierr = nf90_NoErr
|
|
|
369 |
ENDIF
|
|
|
370 |
|
|
|
371 |
do i=1,nx-1
|
|
|
372 |
lon1 = xmin + real(i-1)*dx
|
|
|
373 |
if ( lon1.lt.-eps ) lon1 = lon1 + 360.
|
|
|
374 |
indx = nint( lon1 / dx + 1. )
|
|
|
375 |
do j=1,ny
|
|
|
376 |
field(i,j,1) = tmp(indx,ny-j+1,1)
|
|
|
377 |
do k=2,nz
|
|
|
378 |
field(i,j,k) = field(i,j,k-1)
|
|
|
379 |
enddo
|
|
|
380 |
field(nx,j,k) = field(1,j,k)
|
|
|
381 |
enddo
|
|
|
382 |
enddo
|
|
|
383 |
|
|
|
384 |
endif
|
|
|
385 |
|
|
|
386 |
end
|
|
|
387 |
|
|
|
388 |
c ------------------------------------------------------------
|
|
|
389 |
c Close input file
|
|
|
390 |
c ------------------------------------------------------------
|
|
|
391 |
|
|
|
392 |
subroutine input_close(fid)
|
|
|
393 |
|
|
|
394 |
c Close the input file with file identifier <fid>.
|
|
|
395 |
|
|
|
396 |
use netcdf
|
|
|
397 |
|
|
|
398 |
implicit none
|
|
|
399 |
|
|
|
400 |
c Declaration of subroutine parameters
|
|
|
401 |
integer fid
|
|
|
402 |
|
|
|
403 |
c Auxiliary variables
|
|
|
404 |
integer ierr
|
|
|
405 |
|
|
|
406 |
ierr = NF90_CLOSE(fid)
|
|
|
407 |
IF( ierr /= nf90_NoErr) PRINT *,NF90_STRERROR(ierr)
|
|
|
408 |
|
|
|
409 |
|
|
|
410 |
|
|
|
411 |
end
|