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subroutine getmet(itime,xt,yt,zt,qqint,pvint,thint)
C i i i i i i i
********************************************************************************
* *
* Interpolation of meteorological data (i.e. specific humidity, potential *
* vorticity and potential temperature) onto trajectory positions. *
* *
* Author: A. Stohl *
* *
* 29 January 2000 *
* *
********************************************************************************
* *
* Variables: *
* itime [s] current temporal position *
* xt,yt,zt coordinates of position for which data shall be interpolat*
* pvint interpolated potential vorticity *
* qqint interpolated specific humidity *
* thint interpolated potential temperature *
* *
********************************************************************************
include 'includepar'
include 'includecom'
integer itime,indexf,ngrid,j
real xt,yt,zt,xtn,ytn,qqint,pvint,thint
C Determine the times of the wind fields needed for interpolation
******************************************************************
if ((ldirect*memtime(1).lt.ldirect*itime).and.
+(ldirect*memtime(2).ge.ldirect*itime)) then ! between 1st and 2nd
indexf=1
else if((ldirect*memtime(2).lt.ldirect*itime).and.
+(ldirect*memtime(3).ge.ldirect*itime)) then ! between 2nd and 3rd
indexf=2
endif
C Determine which nesting level to be used
******************************************
ngrid=0
do 12 j=numbnests,1,-1
if ((xt.gt.xln(j)).and.(xt.lt.xrn(j)).and.
+ (yt.gt.yln(j)).and.(yt.lt.yrn(j))) then
ngrid=j
goto 13
endif
12 continue
13 continue
C Do linear interpolation of the meteo data
*******************************************
if (ngrid.eq.0) then ! mother grid
call lininterpol(qq,nxmax,nymax,nuvzmax,nx,ny,nuvz,memind,
+ uvheight,xt,yt,zt,memtime(indexf),memtime(indexf+1),itime,
+ indexf,qqint)
call lininterpol(pv,nxmax,nymax,nuvzmax,nx,ny,nuvz,memind,
+ uvheight,xt,yt,zt,memtime(indexf),memtime(indexf+1),itime,
+ indexf,pvint)
call lininterpol(th,nxmax,nymax,nuvzmax,nx,ny,nuvz,memind,
+ uvheight,xt,yt,zt,memtime(indexf),memtime(indexf+1),itime,
+ indexf,thint)
else if (ngrid.gt.0) then ! nested grid
C Determine nested grid coordinates
***********************************
xtn=(xt-xln(ngrid))*xresoln(ngrid)
ytn=(yt-yln(ngrid))*yresoln(ngrid)
call lininterpoln(qqn,maxnests,nxmaxn,nymaxn,nuvzmax,
+ ngrid,nxn,nyn,nuvz,memind,uvheight,xtn,ytn,zt,memtime(indexf),
+ memtime(indexf+1),itime,indexf,qqint)
call lininterpoln(pvn,maxnests,nxmaxn,nymaxn,nuvzmax,
+ ngrid,nxn,nyn,nuvz,memind,uvheight,xtn,ytn,zt,memtime(indexf),
+ memtime(indexf+1),itime,indexf,pvint)
call lininterpoln(thn,maxnests,nxmaxn,nymaxn,nuvzmax,
+ ngrid,nxn,nyn,nuvz,memind,uvheight,xtn,ytn,zt,memtime(indexf),
+ memtime(indexf+1),itime,indexf,thint)
endif
return
end
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