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michaesp |
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c ************************************************************
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c * This package provides input routines to read if grid *
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c * informations or field from WRF output *
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c * *
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c * Author: Sebastian Schemm, ETH, 2013 *
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c * V.1.0 only support for ideal channel implemented *
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c * for input_grid_wrf *
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c * *
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c ************************************************************
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c ------------------------------------------------------------
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c Open input file
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c ------------------------------------------------------------
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subroutine input_open (fid,filename)
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c Open the input file with filename <filename> and return the
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c file identifier <fid> for further reference.
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implicit none
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include 'netcdf.inc'
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c Declaration of subroutine parameters
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integer fid ! File identifier
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character*80 filename ! Filename
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c Declaration of auxiliary variables
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integer ierr
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c Open IVE netcdf file
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fid = ncopn(filename,NCWRITE,ierr)
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if (ierr.ne.0) goto 900
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c Exception handling
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return
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900 print*,'Cannot open input file ',trim(filename)
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stop
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end
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c ------------------------------------------------------------
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c Read information about the grid
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c ------------------------------------------------------------
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subroutine input_grid_wrf(fid,
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> xmin,xmax,ymin,ymax,dx,dy,nx,ny,nz)
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implicit none
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include 'netcdf.inc'
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c Declaration of subroutine parameters
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integer fid ! File identifier
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integer latid,lonid,levid
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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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integer status
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C get grid info
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status = NF_INQ_DIMID(fid, 'south_north', LATID)
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status = NF_INQ_DIMID(fid, 'west_east', LONID)
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status = NF_INQ_DIMID(fid, 'bottom_top', LEVID)
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if (status .ne. NF_NOERR) print*,"Error in reading grid atts"
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status = NF_INQ_DIMLEN(fid, LONID, nx)
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status = NF_INQ_DIMLEN(fid, LATID, ny)
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status = NF_INQ_DIMLEN(fid, LEVID, nz)
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if (status .ne. NF_NOERR) print*,"Error in reading grid size"
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status = NF_GET_ATT_REAL (fid, NF_GLOBAL, 'DX', dx)
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status = NF_GET_ATT_REAL (fid, NF_GLOBAL, 'DY', dy)
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if (status .ne. NF_NOERR) print*,"Error in reading dx, dy"
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c setup a pseudo grid
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xmin = 0.0
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ymin = 0.0
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xmax = xmin+real(nx-1)*dx
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ymax = ymin+real(ny-1)*dy
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end
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c ------------------------------------------------------------
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c Read variables
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c ------------------------------------------------------------
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subroutine input_var_wrf(fid,varname,field,n1,n2,n3)
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implicit none
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include 'netcdf.inc'
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c Declaration of subroutine parameters
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integer fid, varid
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integer n1,n2,n3
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character*80 varname
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real field(n1,n2,n3)
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c Parmeters
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real gearth ! Earth's acceleration
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parameter (gearth=9.81)
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real addtheta ! Offset for potential temperature
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parameter (addtheta=300.)
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c Auxiliary variables
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real,allocatable,dimension (:,:,:) :: temp,temp1,temp2
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integer ndims
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integer is2d
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integer levid,lonid,latid
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integer nx,ny,nz
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integer status,i,j,k
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character*2 stag
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c ------------ Get grid info ---------------------------------------
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status = NF_INQ_DIMID(fid, 'south_north', LATID)
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status = NF_INQ_DIMID(fid, 'west_east', LONID)
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status = NF_INQ_DIMID(fid, 'bottom_top', LEVID)
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if (status .ne. NF_NOERR) print*,"Error in reading grid atts"
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status = NF_INQ_DIMLEN(fid, LONID, nx)
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status = NF_INQ_DIMLEN(fid, LATID, ny)
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status = NF_INQ_DIMLEN(fid, LEVID, nz)
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if (status .ne. NF_NOERR) print*,"Error in reading grid size"
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c ------------ Allocate memory and set staggering mode -------------
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if (trim(varname).eq.'U') then
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stag = 'X'
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is2d = 0
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elseif (trim(varname).eq.'V') then
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stag = 'Y'
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is2d = 0
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elseif (trim(varname).eq.'W') then
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stag = 'Z'
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is2d = 0
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elseif ( (trim(varname).eq.'geopot').or.
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> (trim(varname).eq.'Z' ) )
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>then
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stag = 'Z'
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is2d = 0
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elseif ( (trim(varname).eq.'geopots').or.
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> (trim(varname).eq.'ZB' ) )
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>then
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stag = 'Z'
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is2d = 1
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elseif ( (trim(varname).eq.'pressure').or.
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> (trim(varname).eq.'P' ) )
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>then
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stag = 'nil'
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is2d = 0
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else if (trim(varname).eq.'TH' .or. trim(varname).eq.'T') then
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stag = 'nil'
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is2d = 0
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else
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status = NF_INQ_VARID (fid, trim(varname), varid)
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status = NF_GET_ATT_TEXT(fid,varid,'stagger',stag)
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if (status .ne. NF_NOERR) print*,"Error in inq:",trim(varname)
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status = NF_INQ_VARNDIMS (fid, varid, ndims)
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is2d = 0
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if ( ndims.eq.3 ) is2d = 1
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endif
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if ( stag.eq.'X' ) then
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allocate( temp (nx+1,ny,nz) )
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allocate( temp1(nx+1,ny,nz) )
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allocate( temp2(nx+1,ny,nz) )
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elseif ( stag.eq.'Y' ) then
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allocate( temp (nx,ny+1,nz) )
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allocate( temp1(nx,ny+1,nz) )
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allocate( temp2(nx,ny+1,nz) )
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elseif ( stag.eq.'Z' ) then
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allocate( temp (nx,ny,nz+1) )
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allocate( temp1(nx,ny,nz+1) )
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allocate( temp2(nx,ny,nz+1) )
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else
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allocate( temp (nx,ny,nz) )
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allocate( temp1(nx,ny,nz) )
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allocate( temp2(nx,ny,nz) )
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endif
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c ------------ Read data ------------------------------------------
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c Zonal wind : temp(nx+1,ny,nk)
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if (trim(varname).eq.'U') then
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status = NF_INQ_VARID (fid, 'U', varid)
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if (status .ne. NF_NOERR) print*,"Error in inq U"
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status = NF_GET_VAR_REAL (fid, varid, temp)
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if (status .ne. NF_NOERR) print*,"Error in reading U"
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c Meridional wind : temp(nx,ny+1,nk)
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else if (trim(varname).eq.'V') then
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status = NF_INQ_VARID (fid, 'V', varid)
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if (status .ne. NF_NOERR) print*,"Error in inq V"
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status = NF_GET_VAR_REAL (fid, varid, temp)
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if (status .ne. NF_NOERR) print*,"Error in reading V"
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c Vertical wind : temp(nx,ny,nz+1)
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else if (trim(varname).eq.'W') then
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status = NF_INQ_VARID (fid, 'W', varid)
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if (status .ne. NF_NOERR) print*,"Error in inq W"
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status = NF_GET_VAR_REAL (fid, varid, temp)
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if (status .ne. NF_NOERR) print*,"Error in reading U"
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c Geopotential height (base + perturbation) : temp(nx,ny,nz+1)
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else if ( (trim(varname).eq.'geopot').or.
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> (trim(varname).eq.'Z' ) )
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>then
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status = NF_INQ_VARID (fid, 'PHB', varid)
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if (status .ne. NF_NOERR) print*,"Error in inq geopot"
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status = NF_GET_VAR_REAL (fid, varid, temp1)
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if (status .ne. NF_NOERR) print*,"Error in reading geopot"
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status = NF_INQ_VARID (fid, 'PH', varid)
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if (status .ne. NF_NOERR) print*,"Error in inq pgeopot"
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status = NF_GET_VAR_REAL (fid, varid, temp2)
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if (status .ne. NF_NOERR) print*,"Error in reading pgeopot"
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do k = 1, nz+1
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do j = 1, ny
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do i = 1, nx
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temp(i,j,k) = temp1(i,j,k) + temp2(i,j,k)
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enddo
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enddo
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enddo
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c surface geopotential: temp(nx,ny,nz+1)
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else if ( (trim(varname).eq.'geopots').or.
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> (trim(varname).eq.'ZB' ) )
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>then
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status = NF_INQ_VARID (fid, 'PHB', varid)
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if (status .ne. NF_NOERR) print*,"Error in inq sgeopot"
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status = NF_GET_VAR_REAL (fid, varid, temp1)
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if (status .ne. NF_NOERR) print*,"Error in reading sgeopot"
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status = NF_INQ_VARID (fid, 'PH', varid)
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if (status .ne. NF_NOERR) print*,"Error in inq pgeopot"
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status = NF_GET_VAR_REAL (fid, varid, temp2)
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if (status .ne. NF_NOERR) print*,"Error in reading pgeopot"
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do k = 1, nz+1
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do j = 1, ny
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do i = 1, nx
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temp(i,j,k) = temp1(i,j,k) + temp2(i,j,k)
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enddo
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enddo
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enddo
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c Pressure (base + perturbation) : temp(nx,ny,nz)
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elseif ( (trim(varname).eq.'pressure').or.
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> (trim(varname).eq.'P' ) )
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>then
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status = NF_INQ_VARID (fid, 'PB', varid)
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if (status .ne. NF_NOERR) print*,"Error in inq pb"
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status = NF_GET_VAR_REAL (fid, varid, temp1)
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if (status .ne. NF_NOERR) print*,"Error in reading pb"
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status = NF_INQ_VARID (fid, 'P', varid)
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if (status .ne. NF_NOERR) print*,"Error in inq p"
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status = NF_GET_VAR_REAL (fid, varid, temp2)
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if (status .ne. NF_NOERR) print*,"Error in reading p"
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do k = 1, nz
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do j = 1, ny
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do i = 1, nx
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temp(i,j,k) = temp1(i,j,k) + temp2(i,j,k)
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enddo
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enddo
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enddo
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c Potential temperature: temp(nx,ny,nz)
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else if (trim(varname).eq.'TH' .or. trim(varname).eq.'T') then
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status = NF_INQ_VARID (fid, 'T', varid)
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if (status .ne. NF_NOERR) print*,"Error in inq T"
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status = NF_GET_VAR_REAL (fid, varid, temp)
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if (status .ne. NF_NOERR) print*,"Error in reading T"
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c Any other field (2D + 3D): temp(:,:,:), depending on staggering
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else
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status = NF_INQ_VARID (fid, trim(varname), varid)
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if (status .ne. NF_NOERR) then
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print*,"Error in inq:",trim(varname)
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endif
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status = NF_GET_VAR_REAL (fid, varid, temp)
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if (status .ne. NF_NOERR) then
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print*,"Error in reading:",trim(varname)
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endif
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endif
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c ------------ Destaggering in X, Y and Z direction ---------------
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if (trim(stag).eq.'X') then
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do k = 1, n3
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do j = 1, n2
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do i = 1, n1
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field(i,j,k) = 0.5*(temp(i,j,k) + temp(i+1,j,k))
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enddo
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enddo
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enddo
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elseif (trim(stag).eq.'Y') then
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do k = 1, n3
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do j = 1, n2
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do i = 1, n1
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field(i,j,k) = 0.5*(temp(i,j,k) + temp(i,j+1,k))
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enddo
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enddo
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enddo
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elseif (trim(stag).eq.'Z') then
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do k = 1, n3
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do j = 1, n2
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do i = 1, n1
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field(i,j,k) = 0.5*(temp(i,j,k) + temp(i,j,k+1))
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enddo
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enddo
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enddo
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else
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do k = 1, n3
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do j = 1, n2
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do i = 1, n1
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field(i,j,k) = temp(i,j,k)
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enddo
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346 |
enddo
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|
347 |
enddo
|
|
|
348 |
|
|
|
349 |
endif
|
|
|
350 |
|
|
|
351 |
c ---------- Change units -----------------------------------------
|
|
|
352 |
|
|
|
353 |
c Pressure Pa -> hPa
|
|
|
354 |
if (trim(varname).eq.'pressure' .or. trim(varname).eq.'P') then
|
|
|
355 |
do k = 1, n3
|
|
|
356 |
do j = 1, n2
|
|
|
357 |
do i = 1, n1
|
|
|
358 |
field(i,j,k)=0.01 * field(i,j,k)
|
|
|
359 |
enddo
|
|
|
360 |
enddo
|
|
|
361 |
enddo
|
|
|
362 |
|
|
|
363 |
c Potential temperature + 300
|
|
|
364 |
else if (trim(varname).eq.'TH' .or. trim(varname).eq.'T') then
|
|
|
365 |
do k = 1, n3
|
|
|
366 |
do j = 1, n2
|
|
|
367 |
do i = 1, n1
|
|
|
368 |
field(i,j,k)=field(i,j,k) + addtheta
|
|
|
369 |
enddo
|
|
|
370 |
enddo
|
|
|
371 |
enddo
|
|
|
372 |
|
|
|
373 |
c Geopotential -> Geopotential Height (3D + Surface)
|
|
|
374 |
else if ( (trim(varname).eq.'geopot' ).or.
|
|
|
375 |
> (trim(varname).eq.'Z' ).or.
|
|
|
376 |
> (trim(varname).eq.'geopots').or.
|
|
|
377 |
> (trim(varname).eq.'ZB' ) )
|
|
|
378 |
>then
|
|
|
379 |
do k = 1, n3
|
|
|
380 |
do j = 1, n2
|
|
|
381 |
do i = 1, n1
|
|
|
382 |
field(i,j,k)=field(i,j,k)/gearth
|
|
|
383 |
enddo
|
|
|
384 |
enddo
|
|
|
385 |
enddo
|
|
|
386 |
|
|
|
387 |
endif
|
|
|
388 |
|
|
|
389 |
c ---------- Copy lowest level for 2d tracing ---------------------
|
|
|
390 |
if ( is2d.eq.1 ) then
|
|
|
391 |
do i=1,n1
|
|
|
392 |
do j=1,n2
|
|
|
393 |
do k=1,n3
|
|
|
394 |
field(i,j,k) = field(i,j,1)
|
|
|
395 |
enddo
|
|
|
396 |
enddo
|
|
|
397 |
enddo
|
|
|
398 |
endif
|
|
|
399 |
|
|
|
400 |
|
|
|
401 |
end
|
|
|
402 |
|
|
|
403 |
c ------------------------------------------------------------
|
|
|
404 |
c Close input file
|
|
|
405 |
c ------------------------------------------------------------
|
|
|
406 |
|
|
|
407 |
subroutine input_close(fid)
|
|
|
408 |
|
|
|
409 |
c Close the input file with file identifier <fid>.
|
|
|
410 |
|
|
|
411 |
implicit none
|
|
|
412 |
|
|
|
413 |
include 'netcdf.inc'
|
|
|
414 |
|
|
|
415 |
c Declaration of subroutine parameters
|
|
|
416 |
integer fid
|
|
|
417 |
|
|
|
418 |
c Auxiliary variables
|
|
|
419 |
integer ierr
|
|
|
420 |
|
|
|
421 |
c Close file
|
|
|
422 |
call ncclos(fid,ierr)
|
|
|
423 |
|
|
|
424 |
end
|
|
|
425 |
|
|
|
426 |
c ------------------------------------------------------------
|
|
|
427 |
c ------------------------------------------------------------
|