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subroutine etatrafo(xt,yt,zt,itime1,itime2,itime,indexf,ngrid,
+psint)
***********************************************************************
* *
* TRAJECTORY MODEL SUBROUTINE ETATRAFO *
* *
***********************************************************************
* *
* AUTHOR: G. WOTAWA *
* DATE: 1994-04-06 *
* LAST UPDATE: ---------- *
* *
***********************************************************************
* *
* DESCRIPTION: This subroutine transforms the vertical coordinate *
* from z-coordinate system [m] to eta-coordinate *
* system [ECMWF] *
* Remark: Just call after initialization of a new *
* trajectory (first call of getwind) *
* *
***********************************************************************
* *
* INPUT: *
* *
* xt x-coordinate of point [grid units] *
* yt y-coordinate of point [grid units] *
* zt z-coordinate of point [m] *
* itime1 time [s] of first windfield *
* itime2 time [s] of second windfield *
* itime time [s] of calculation *
* indexf time index of field xx *
* psint surface pressure at point (xt,yt) [Pa] *
* *
***********************************************************************
* *
* OUTPUT: *
* *
* zt z-coordinate of point [eta ECMWF] *
* *
***********************************************************************
*
include 'includepar'
include 'includecom'
integer itime1,itime2,itime,indexf,k,ngrid
real xt,yt,zt,psint,fract,pp1,pp2,tv
real tlev(nuvzmax),zzlev(nwzmax)
*
* calculate interpolated vertical temperature profile on model levels
*
do 10 k=1,nuvz
if (ngrid.gt.0) then
call levlininterpoln(ttn,maxnests,nxmaxn,nymaxn,nuvzmax,ngrid,
+ nxn,nyn,memind,xt,yt,k,itime1,itime2,itime,indexf,tlev(k))
else
call levlininterpol(tt,nxmax,nymax,nuvzmax,nx,ny,memind,
+ xt,yt,k,itime1,itime2,itime,indexf,tlev(k))
endif
10 continue
*
* calculate geometric height on model levels
*
zzlev(1)=0.
if (zt.lt.zzlev(1)) then
write(*,*) ' TRAJECTORY MODEL: NOTICE - STARTING POINT OUT'//
& ' OF MODEL DOMAIN'
write(*,*) ' (VERTICAL) HAS BEEN DETECTED --> IT IS SET TO'//
& ' THE BOTTOM OF THE MODEL ...'
zt=uvheight(1)
return
endif
do 15 k=2,nwz
pp1=akm(k-1)+bkm(k-1)*psint
pp2=akm(k)+bkm(k)*psint
tv=tlev(k-1) !! NO HUMIDITY INFORMATION AVAILABLE IN FLEXTRA
zzlev(k)=zzlev(k-1)+r_air/ga*log(pp1/pp2)*tv
if(zt.lt.zzlev(k)) goto 20
15 continue
write(*,*) ' TRAJECTORY MODEL: NOTICE - STARTING POINT OUT'//
& ' OF MODEL DOMAIN'
write(*,*) ' (VERTICAL) HAS BEEN DETECTED --> IT IS SET TO'//
& ' THE TOP OF THE MODEL ...'
zt=uvheight(nuvz)
return
20 fract=(zt-zzlev(k-1))/(zzlev(k)-zzlev(k-1))
zt=wheight(k-1)*(1.-fract)+wheight(k)*fract
if(zt.lt.uvheight(1)) zt=uvheight(1)
if(zt.gt.uvheight(nuvz)) zt=uvheight(nuvz)
return
end
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