1 |
SUBROUTINE gwstress(nlon,nlev,ktest,kcrit,kkenvh,kknu,prho,pstab,pvph, & |
2 |
pstd,psig,pmea,ppic,ptau,pgeom1,pdmod) |
3 |
|
4 |
!**** *gwstress* |
5 |
|
6 |
! purpose. |
7 |
! -------- |
8 |
|
9 |
!** interface. |
10 |
! ---------- |
11 |
! call *gwstress* from *gwdrag* |
12 |
|
13 |
! explicit arguments : |
14 |
! -------------------- |
15 |
! ==== inputs === |
16 |
! ==== outputs === |
17 |
|
18 |
! implicit arguments : none |
19 |
! -------------------- |
20 |
|
21 |
! method. |
22 |
! ------- |
23 |
|
24 |
|
25 |
! externals. |
26 |
! ---------- |
27 |
|
28 |
|
29 |
! reference. |
30 |
! ---------- |
31 |
|
32 |
! see ecmwf research department documentation of the "i.f.s." |
33 |
|
34 |
! author. |
35 |
! ------- |
36 |
|
37 |
! modifications. |
38 |
! -------------- |
39 |
! f. lott put the new gwd on ifs 22/11/93 |
40 |
|
41 |
!----------------------------------------------------------------------- |
42 |
USE dimens_m |
43 |
USE dimphy |
44 |
USE suphec_m |
45 |
USE yoegwd |
46 |
IMPLICIT NONE |
47 |
|
48 |
!----------------------------------------------------------------------- |
49 |
|
50 |
!* 0.1 arguments |
51 |
! --------- |
52 |
|
53 |
INTEGER nlon, nlev |
54 |
INTEGER kcrit(nlon), ktest(nlon), kkenvh(nlon), kknu(nlon) |
55 |
|
56 |
REAL prho(nlon,nlev+1), pstab(nlon,nlev+1), ptau(nlon,nlev+1), & |
57 |
pvph(nlon,nlev+1), pgeom1(nlon,nlev) |
58 |
REAL, INTENT (IN) :: pstd(nlon) |
59 |
|
60 |
REAL, INTENT (IN) :: psig(nlon) |
61 |
REAL pmea(nlon), ppic(nlon) |
62 |
REAL pdmod(nlon) |
63 |
|
64 |
!----------------------------------------------------------------------- |
65 |
|
66 |
!* 0.2 local arrays |
67 |
! ------------ |
68 |
INTEGER jl |
69 |
REAL zblock, zvar, zeff |
70 |
LOGICAL lo |
71 |
|
72 |
!----------------------------------------------------------------------- |
73 |
|
74 |
!* 0.3 functions |
75 |
! --------- |
76 |
! ------------------------------------------------------------------ |
77 |
|
78 |
!* 1. initialization |
79 |
! -------------- |
80 |
|
81 |
!* 3.1 gravity wave stress. |
82 |
|
83 |
DO 301 jl = 1, klon |
84 |
IF (ktest(jl)==1) THEN |
85 |
|
86 |
! effective mountain height above the blocked flow |
87 |
|
88 |
IF (kkenvh(jl)==klev) THEN |
89 |
zblock = 0.0 |
90 |
ELSE |
91 |
zblock = (pgeom1(jl,kkenvh(jl))+pgeom1(jl,kkenvh(jl)+1))/2./rg |
92 |
END IF |
93 |
|
94 |
zvar = ppic(jl) - pmea(jl) |
95 |
zeff = amax1(0.,zvar-zblock) |
96 |
|
97 |
ptau(jl,klev+1) = prho(jl,klev+1)*gkdrag*psig(jl)*zeff**2/4./ & |
98 |
pstd(jl)*pvph(jl,klev+1)*pdmod(jl)*sqrt(pstab(jl,klev+1)) |
99 |
|
100 |
! too small value of stress or low level flow include critical level |
101 |
! or low level flow: gravity wave stress nul. |
102 |
|
103 |
lo = (ptau(jl,klev+1)<gtsec) .OR. (kcrit(jl)>=kknu(jl)) .OR. & |
104 |
(pvph(jl,klev+1)<gvcrit) |
105 |
! if(lo) ptau(jl,klev+1)=0.0 |
106 |
|
107 |
ELSE |
108 |
|
109 |
ptau(jl,klev+1) = 0.0 |
110 |
|
111 |
END IF |
112 |
|
113 |
301 CONTINUE |
114 |
|
115 |
RETURN |
116 |
END |