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real function pp(psurf,eta)
***********************************************************************
* *
* TRAJECTORY MODEL SUBROUTINE PP *
* *
***********************************************************************
* *
* AUTHOR: G. WOTAWA *
* DATE: 1994-04-07 *
* LAST UPDATE: ---------- *
* *
***********************************************************************
* *
* DESCRIPTION: This function computes the pressure as a function of *
* eta (ECMWF) and surface pressure. The interpolation *
* between the nearest model layers is performed linear *
* *
***********************************************************************
* *
* INPUT: *
* *
* psurf surface pressure [Pa] *
* eta vertical coordinate eta (ECMWF) *
* *
***********************************************************************
* *
* OUTPUT: *
* *
* pp pressure [Pa] *
* *
***********************************************************************
*
include 'includepar'
include 'includecom'
integer k
real psurf,eta,fract,pp1,pp2
*
* SEE BETWEEN WHICH MODEL LAYERS ETA IS SITUATED
*
do 10 k=2,nwz
if(wheight(k).gt.eta) goto 20
10 continue
k=nwz
20 fract=(eta-wheight(k-1))/(wheight(k)-wheight(k-1))
pp1=akm(k-1)+bkm(k-1)*psurf
pp2=akm(k)+bkm(k)*psurf
pp=pp1*(1.-fract)+pp2*fract
return
end
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