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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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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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42 |
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c Open IVE netcdf file
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44 |
call cdfopn(filename,fid,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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49 |
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900 print*,'Cannot open input file ',trim(filename)
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stop
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53 |
end
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56 |
c ------------------------------------------------------------
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c Read information about the grid
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c ------------------------------------------------------------
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59 |
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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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63 |
> 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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implicit none
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76 |
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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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96 |
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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101 |
character*80 cstfile
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integer cstid
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real times(10)
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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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108 |
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c Auxiliary varaibles
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integer ierr
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111 |
integer i,j,k
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112 |
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 is2d
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michaesp |
117 |
integer plev
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michaesp |
118 |
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119 |
c Init the flag for 2D variables - assume a 3D field
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is2d = 0
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121 |
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michaesp |
122 |
c Init the flag for pressure levels (PS is not needed)
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plev = 0
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124 |
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michaesp |
125 |
c Inquire dimensions and grid constants if <fid> is negative
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if (fid.lt.0) then
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128 |
c Get grid info for the selected variable
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if ( fieldname.eq.'PLEV' ) then
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varname = 'PS'
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stagz = 0.
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132 |
call getdef(-fid,varname,ndim,mdv,vardim,
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133 |
> varmin,varmax,stag,ierr)
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if (ierr.ne.0) goto 900
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135 |
call getcfn(-fid,cstfile,ierr)
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if (ierr.ne.0) goto 903
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call cdfopn(cstfile,cstid,ierr)
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138 |
if (ierr.ne.0) goto 903
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139 |
call getlevs(cstid,vardim(3),tmp,tmp,tmp,tmp,ierr)
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140 |
if (ierr.ne.0) goto 903
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141 |
call clscdf(cstid,ierr)
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142 |
if (ierr.ne.0) goto 903
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143 |
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144 |
elseif ( ( fieldname.eq.'PLAY' ).or.( fieldname.eq.'P' ) ) then
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varname = 'PS'
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stagz = -0.5
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147 |
call getdef(-fid,varname,ndim,mdv,vardim,
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148 |
> varmin,varmax,stag,ierr)
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149 |
if (ierr.ne.0) goto 900
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150 |
call getcfn(-fid,cstfile,ierr)
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151 |
if (ierr.ne.0) goto 903
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152 |
call cdfopn(cstfile,cstid,ierr)
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153 |
if (ierr.ne.0) goto 903
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154 |
call getlevs(cstid,vardim(3),tmp,tmp,tmp,tmp,ierr)
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155 |
if (ierr.ne.0) goto 903
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156 |
call clscdf(cstid,ierr)
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if (ierr.ne.0) goto 903
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158 |
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159 |
else
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160 |
varname = fieldname
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161 |
call getdef(-fid,varname,ndim,mdv,vardim,
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162 |
> varmin,varmax,stag,ierr)
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163 |
if (ierr.ne.0) goto 900
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164 |
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165 |
endif
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166 |
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167 |
c Set the grid dimensions and constants - vardim(3) is taken from constants file
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168 |
nx = vardim(1)
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169 |
ny = vardim(2)
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170 |
nz = vardim(3)
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171 |
xmin = varmin(1)
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172 |
ymin = varmin(2)
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173 |
xmax = varmax(1)
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174 |
ymax = varmax(2)
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175 |
dx = (xmax-xmin)/real(nx-1)
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dy = (ymax-ymin)/real(ny-1)
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177 |
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c Get pole position - if no constants file available, set default pole
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179 |
call getcfn(-fid,cstfile,ierr)
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180 |
if (ierr.eq.0) then
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181 |
call cdfopn(cstfile,cstid,ierr)
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182 |
if (ierr.ne.0) goto 903
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183 |
call getpole(cstid,pollon,pollat,ierr)
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if (ierr.ne.0) goto 903
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call clscdf(cstid,ierr)
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186 |
if (ierr.ne.0) goto 903
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else
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pollon = 0.
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pollat = 90.
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endif
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191 |
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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 Get full grid info - in particular staggering flag; set flag for 2D tracing
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196 |
if ( fieldname.eq.'PLEV' ) then
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197 |
varname = 'PS'
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stagz = 0.
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199 |
call getdef(fid,varname,ndim,mdv,vardim,
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200 |
> varmin,varmax,stag,ierr)
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201 |
if (ierr.ne.0) goto 900
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202 |
call getcfn(fid,cstfile,ierr)
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203 |
if (ierr.ne.0) goto 903
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204 |
call cdfopn(cstfile,cstid,ierr)
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205 |
if (ierr.ne.0) goto 903
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206 |
call getlevs(cstid,vardim(3),tmp,tmp,tmp,tmp,ierr)
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207 |
if (ierr.ne.0) goto 903
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208 |
call clscdf(cstid,ierr)
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209 |
if (ierr.ne.0) goto 903
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210 |
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211 |
elseif ( ( fieldname.eq.'PLAY' ).or.( fieldname.eq.'P' ) ) then
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212 |
varname = 'PS'
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213 |
stagz = -0.5
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214 |
call getdef(fid,varname,ndim,mdv,vardim,
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> varmin,varmax,stag,ierr)
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216 |
if (ierr.ne.0) goto 900
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217 |
call getcfn(fid,cstfile,ierr)
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218 |
if (ierr.ne.0) goto 903
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call cdfopn(cstfile,cstid,ierr)
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220 |
if (ierr.ne.0) goto 903
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221 |
call getlevs(cstid,vardim(3),tmp,tmp,tmp,tmp,ierr)
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222 |
if (ierr.ne.0) goto 903
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223 |
call clscdf(cstid,ierr)
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224 |
if (ierr.ne.0) goto 903
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225 |
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226 |
else
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227 |
varname=fieldname
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228 |
call getdef(fid,varname,ndim,mdv,vardim,
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> varmin,varmax,stag,ierr)
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230 |
if (ierr.ne.0) goto 900
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231 |
if (vardim(3).eq.1) is2d = 1
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232 |
endif
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233 |
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234 |
c Get time information (check if time is correct)
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235 |
call gettimes(fid,times,ntimes,ierr)
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236 |
if (ierr.ne.0) goto 901
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237 |
isok=0
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238 |
do i=1,ntimes
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239 |
if (abs(time-times(i)).lt.eps) then
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240 |
isok = 1
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241 |
rtime = times(i)
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242 |
elseif (timecheck.eq.'no') then
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isok = 1
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244 |
rtime = times(1)
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endif
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enddo
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247 |
if ( isok.eq.0) goto 905
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248 |
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249 |
c If 2D tracing requested: take dummay values for PS, AKLEV,BKLEV,AKLAY,BKLAY
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250 |
if ( is2d.eq.1 ) then
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251 |
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252 |
do i=1,nx
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do j=1,ny
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ps(i,j) = 1050.
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enddo
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enddo
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257 |
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do k=1,nz
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259 |
aklev(k) = 0.
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260 |
bklev(k) = real(nz-k)/real(nz-1)
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261 |
aklay(k) = 0.
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bklay(k) = real(nz-k)/real(nz-1)
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263 |
enddo
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264 |
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c 3D tracing - read PS, AKLEV,BKLEV,AKLAY;BKLAY
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else
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267 |
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c Read the level coefficients from the constants file
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269 |
call getcfn(fid,cstfile,ierr)
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270 |
if (ierr.ne.0) goto 903
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271 |
call cdfopn(cstfile,cstid,ierr)
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272 |
if (ierr.ne.0) goto 903
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273 |
call getlevs(cstid,vardim(3),aklev,bklev,aklay,bklay,ierr)
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274 |
if (ierr.ne.0) goto 903
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275 |
call clscdf(cstid,ierr)
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276 |
if (ierr.ne.0) goto 903
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277 |
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michaesp |
278 |
c Check whether PS is needed to get the 3d pressure field
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279 |
plev = 1
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280 |
do i=1,nz
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281 |
if ( (abs(stagz).lt.eps).and.(abs(bklev(i)).gt.eps) ) then
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282 |
plev = 0
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283 |
endif
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284 |
if ( (abs(stagz).gt.eps).and.(abs(bklay(i)).gt.eps) ) then
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285 |
plev = 0
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286 |
endif
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287 |
enddo
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michaesp |
288 |
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| 9 |
michaesp |
289 |
c Read surface pressure if needed
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290 |
if ( plev.ne.1 ) then
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291 |
varname='PS'
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292 |
call getdat(fid,varname,rtime,0,ps,ierr)
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293 |
if (ierr.ne.0) goto 904
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294 |
else
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295 |
do i=1,nx
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296 |
do j=1,ny
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297 |
ps(i,j) = 1000.
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298 |
enddo
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299 |
enddo
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300 |
endif
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301 |
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| 3 |
michaesp |
302 |
endif
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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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307 |
do k=1,nz
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308 |
if ( abs(stagz).lt.eps ) then
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309 |
p3(i,j,k)=aklev(k)+bklev(k)*ps(i,j)
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310 |
else
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311 |
p3(i,j,k)=aklay(k)+bklay(k)*ps(i,j)
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312 |
endif
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313 |
enddo
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314 |
enddo
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315 |
enddo
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316 |
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317 |
c Set the ak and bk for the vertical grid
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318 |
do k=1,nz
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319 |
if ( abs(stagz).lt.eps ) then
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320 |
ak(k)=aklev(k)
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321 |
bk(k)=bklev(k)
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322 |
else
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323 |
ak(k)=aklay(k)
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324 |
bk(k)=bklay(k)
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325 |
endif
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326 |
enddo
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327 |
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328 |
endif
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329 |
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330 |
c Exit point for subroutine
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331 |
800 continue
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332 |
return
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333 |
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334 |
c Exception handling
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335 |
900 print*,'Cannot retrieve grid dimension from ',fid
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336 |
stop
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337 |
901 print*,'Cannot retrieve grid parameters from ',fid
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338 |
stop
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339 |
902 print*,'Grid inconsistency detected for ',fid
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340 |
stop
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341 |
903 print*,'Problem with level coefficients from ',trim(cstfile)
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342 |
stop
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343 |
904 print*,'Cannot read surface pressure from ',trim(cstfile)
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344 |
stop
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345 |
905 print*,'Cannot find time ',time,' on ',fid
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346 |
stop
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347 |
906 print*,'Unable to get grid info ',fid
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348 |
stop
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|
349 |
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|
|
350 |
end
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|
351 |
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|
352 |
c ------------------------------------------------------------
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353 |
c Read wind information
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354 |
c ------------------------------------------------------------
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355 |
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|
356 |
subroutine input_wind (fid,fieldname,field,time,stagz,mdv,
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|
357 |
> xmin,xmax,ymin,ymax,dx,dy,nx,ny,nz,
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|
358 |
> timecheck)
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359 |
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|
360 |
c Read the wind component <fieldname> from the file with identifier
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|
361 |
c <fid> and save it in the 3d array <field>. The vertical staggering
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|
362 |
c information is provided in <stagz> and gives the reference to either
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|
363 |
c the layer or level field from <input_grid>. A consistency check is
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|
364 |
c performed to have an agreement with the grid specified by <xmin,xmax,
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|
365 |
c ymin,ymax,dx,dy,nx,ny,nz>.
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366 |
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367 |
implicit none
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368 |
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369 |
c Declaration of variables and parameters
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370 |
integer fid ! File identifier
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371 |
character*80 fieldname ! Name of the wind field
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372 |
integer nx,ny,nz ! Dimension of fields
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373 |
real field(nx,ny,nz) ! 3d wind field
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374 |
real stagz ! Staggering in the z direction
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375 |
real mdv ! Missing data flag
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376 |
real xmin,xmax,ymin,ymax ! Domain size
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377 |
real dx,dy ! Horizontal resolution
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378 |
real time ! Time
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379 |
character*80 timecheck ! Either 'yes' or 'no'
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380 |
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381 |
c Numerical and physical parameters
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382 |
real eps ! Numerical epsilon
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|
383 |
parameter (eps=0.001)
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|
384 |
real notimecheck ! 'Flag' for no time check
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385 |
parameter (notimecheck=7.26537)
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386 |
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387 |
c Netcdf variables
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|
388 |
integer ierr
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389 |
character*80 varname
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|
390 |
integer vardim(4)
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|
391 |
real varmin(4),varmax(4)
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392 |
real stag(4)
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393 |
integer ndim
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394 |
real times(10)
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395 |
integer ntimes
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396 |
character*80 cstfile
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|
397 |
integer cstid
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|
398 |
real aklay(200),bklay(200),aklev(200),bklev(200)
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|
399 |
real ps(nx,ny)
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400 |
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|
401 |
c Auxiliary variables
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|
402 |
integer isok
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|
403 |
integer i,j,k
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|
404 |
integer nz1
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|
405 |
real rtime
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|
406 |
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|
407 |
c Read variable definition - for P, PLEV and PLAY: load also ak,bk
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|
408 |
if ( ( fieldname.eq.'PLEV' ).or.
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|
409 |
> ( fieldname.eq.'PLAY' ).or.
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|
410 |
> ( fieldname.eq.'P' ) )
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|
411 |
>then
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|
412 |
call getcfn(fid,cstfile,ierr)
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|
413 |
if (ierr.ne.0) goto 905
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|
414 |
call cdfopn(cstfile,cstid,ierr)
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|
415 |
if (ierr.ne.0) goto 905
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|
416 |
call getlevs(cstid,nz1,aklev,bklev,aklay,bklay,ierr)
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|
417 |
if (ierr.ne.0) goto 905
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|
418 |
call clscdf(cstid,ierr)
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|
419 |
if (ierr.ne.0) goto 905
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|
420 |
varname = 'PS'
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|
421 |
call getdef(fid,varname,ndim,mdv,vardim,
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|
422 |
> varmin,varmax,stag,ierr)
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|
423 |
vardim(3) = nz1
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|
424 |
if (ierr.ne.0) goto 900
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|
425 |
else
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|
426 |
varname = fieldname
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|
427 |
call getdef(fid,varname,ndim,mdv,vardim,
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|
428 |
> varmin,varmax,stag,ierr)
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|
429 |
if (ierr.ne.0) goto 900
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|
430 |
stagz=stag(3)
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|
431 |
endif
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|
432 |
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|
433 |
c Get time information (set time to first one in the file)
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|
434 |
call gettimes(fid,times,ntimes,ierr)
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|
435 |
if (ierr.ne.0) goto 902
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|
436 |
isok=0
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|
437 |
do i=1,ntimes
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|
438 |
if (abs(time-times(i)).lt.eps) then
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|
439 |
isok = 1
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|
440 |
rtime = times(i)
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|
441 |
elseif (timecheck.eq.'no') then
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|
442 |
isok = 1
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|
443 |
rtime = times(1)
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|
444 |
endif
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|
445 |
enddo
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|
446 |
if ( isok.eq.0 ) goto 904
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|
447 |
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|
448 |
c Read field
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|
449 |
if ( ( fieldname.eq.'P' ).or.(fieldname.eq.'PLAY') ) then ! P, PLAY
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|
450 |
stagz = -0.5
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|
451 |
varname = 'PS'
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|
452 |
call getdat(fid,varname,rtime,0,ps,ierr)
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|
453 |
if (ierr.ne.0) goto 903
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|
454 |
do i=1,nx
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|
455 |
do j=1,ny
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|
456 |
do k=1,nz
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|
457 |
field(i,j,k)=aklay(k)+bklay(k)*ps(i,j)
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|
|
458 |
enddo
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|
459 |
enddo
|
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|
460 |
enddo
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|
|
461 |
|
|
|
462 |
elseif ( fieldname.eq.'PLEV' ) then ! PLEV
|
|
|
463 |
stagz = 0.
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|
|
464 |
varname = 'PS'
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|
|
465 |
call getdat(fid,varname,rtime,0,ps,ierr)
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|
|
466 |
if (ierr.ne.0) goto 903
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|
|
467 |
do i=1,nx
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|
|
468 |
do j=1,ny
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|
|
469 |
do k=1,nz
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|
|
470 |
field(i,j,k)=aklev(k)+bklev(k)*ps(i,j)
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|
|
471 |
enddo
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|
|
472 |
enddo
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|
|
473 |
enddo
|
|
|
474 |
|
|
|
475 |
else ! Other fields
|
|
|
476 |
varname=fieldname
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|
|
477 |
call getdat(fid,varname,rtime,0,field,ierr)
|
|
|
478 |
if (ierr.ne.0) goto 903
|
|
|
479 |
|
|
|
480 |
endif
|
|
|
481 |
|
|
|
482 |
c If the field is 2D, expand it to 3D - simple handling of 2D tracing
|
|
|
483 |
if ( vardim(3).eq.1 ) then
|
|
|
484 |
do i=1,nx
|
|
|
485 |
do j=1,ny
|
|
|
486 |
do k=1,nz
|
|
|
487 |
field(i,j,k) = field(i,j,1)
|
|
|
488 |
enddo
|
|
|
489 |
enddo
|
|
|
490 |
enddo
|
|
|
491 |
endif
|
|
|
492 |
|
|
|
493 |
|
|
|
494 |
|
|
|
495 |
c Exception handling
|
|
|
496 |
return
|
|
|
497 |
|
|
|
498 |
900 print*,'Cannot retrieve definition for ',trim(varname),' ',fid
|
|
|
499 |
stop
|
|
|
500 |
901 print*,'Grid inconsistency detected for ',trim(varname),' ',fid
|
|
|
501 |
stop
|
|
|
502 |
902 print*,'Cannot retrieve time for ',trim(varname),' ',fid
|
|
|
503 |
stop
|
|
|
504 |
903 print*,'Cannot load wind component ',trim(varname),' ',fid
|
|
|
505 |
stop
|
|
|
506 |
904 print*,'Cannot load time ',time,' for ',trim(varname),' ',fid
|
|
|
507 |
stop
|
|
|
508 |
905 print*,'Cannot load time vertical grid AK, BK from file ',fid
|
|
|
509 |
stop
|
|
|
510 |
|
|
|
511 |
end
|
|
|
512 |
|
|
|
513 |
c ------------------------------------------------------------
|
|
|
514 |
c Close input file
|
|
|
515 |
c ------------------------------------------------------------
|
|
|
516 |
|
|
|
517 |
subroutine input_close(fid)
|
|
|
518 |
|
|
|
519 |
c Close the input file with file identifier <fid>.
|
|
|
520 |
|
|
|
521 |
implicit none
|
|
|
522 |
|
|
|
523 |
c Declaration of subroutine parameters
|
|
|
524 |
integer fid
|
|
|
525 |
|
|
|
526 |
c Auxiliary variables
|
|
|
527 |
integer ierr
|
|
|
528 |
|
|
|
529 |
c Close file
|
|
|
530 |
call clscdf(fid,ierr)
|
|
|
531 |
|
|
|
532 |
end
|