1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
subroutine zztrafo(ngrid,xt,yt,zt,itime1,itime2,itime,indexf,
+psint,ht)
***********************************************************************
* *
* TRAJECTORY MODEL SUBROUTINE ZZTRAFO *
* *
***********************************************************************
* *
* AUTHOR: G. WOTAWA *
* DATE: 1994-04-07 *
* LAST UPDATE: 1999-01-07 Adaptation to nesting *
* *
***********************************************************************
* *
* DESCRIPTION: This subroutine transforms the vertical coordinate *
* eta (ECMWF) to geometric height [m] above model *
* orography (relative height) *
* Method: vertical integration of hydrostatic equation *
* *
* REMARK: For the calculation of geometric height, the virtual *
* temperature difference has been neglected. The gas constant *
* for dry air has been used. *
* *
***********************************************************************
* *
* INPUT: *
* *
* ngrid number of nesting level to be used *
* xt x-coordinate of point [grid units] *
* yt y-coordinate of point [grid units] *
* zt z-coordinate of point [eta (ECMWF)] *
* 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: *
* *
* ht geometric height [m] *
* *
***********************************************************************
*
include 'includepar'
include 'includecom'
integer itime1,itime2,itime,indexf,i,k,ngrid
real xt,yt,zt,ht,psint,fract,pp1,pp2,tv
real tlev(nuvzmax)
real zzlev1,zzlev2
do 10 k=2,nwz
if(zt.le.wheight(k)) goto 20
10 continue
k=nwz
20 fract=(zt-wheight(k-1))/(wheight(k)-wheight(k-1))
*
* calculate interpolated vertical temperature profile on model levels
*
do 30 i=1,k-1
if (ngrid.gt.0) then
call levlininterpoln(ttn,maxnests,nxmaxn,nymaxn,nuvzmax,ngrid,
+ nxn,nyn,memind,xt,yt,i,itime1,itime2,itime,indexf,tlev(i))
else
call levlininterpol(tt,nxmax,nymax,nuvzmax,nx,ny,memind,
+ xt,yt,i,itime1,itime2,itime,indexf,tlev(i))
endif
30 continue
*
* calculate layer indices between which zt is situated
*
zzlev1=0
do 40 i=2,k-1
pp1=akm(i-1)+bkm(i-1)*psint
pp2=akm(i)+bkm(i)*psint
tv=tlev(i-1)
40 zzlev1=zzlev1+r_air/ga*log(pp1/pp2)*tv
pp1=akm(k-1)+bkm(k-1)*psint
pp2=akm(k) +bkm(k)*psint
tv=tlev(k-1)
zzlev2=zzlev1+r_air/ga*log(pp1/pp2)*tv
ht=zzlev1*(1.-fract)+zzlev2*fract
return
end
|
