1 |
guez |
120 |
module cltrac_m |
2 |
guez |
3 |
|
3 |
guez |
81 |
IMPLICIT NONE |
4 |
|
|
|
5 |
guez |
120 |
contains |
6 |
guez |
81 |
|
7 |
guez |
120 |
SUBROUTINE cltrac(dtime, coef, t, tr, flux, paprs, pplay, delp, d_tr) |
8 |
|
|
|
9 |
guez |
270 |
! From LMDZ4/libf/phylmd/cltrac.F, version 1.1.1.1 2004/05/19 12:53:07 |
10 |
guez |
120 |
|
11 |
guez |
270 |
USE dimphy, only: klon, klev |
12 |
|
|
USE suphec_m, only: rd, rg |
13 |
|
|
|
14 |
|
|
! Auteur : O. Boucher (LOA/LMD), date: 1996/11/27 |
15 |
|
|
! inspir\'e de clvent |
16 |
|
|
|
17 |
|
|
! Objet: diffusion verticale de traceurs avec flux fix\'e \`a la |
18 |
|
|
! surface ou flux du type c-drag |
19 |
|
|
|
20 |
|
|
REAL, INTENT(IN):: dtime ! intervalle du temps (en second) |
21 |
|
|
|
22 |
|
|
REAL, INTENT(IN):: coef(:, 2:) ! (klon, 2:klev) |
23 |
|
|
! coefficient d'echange (m**2/s) l>1 |
24 |
|
|
|
25 |
|
|
REAL, INTENT(IN):: t(klon, klev) ! temperature (K) |
26 |
|
|
REAL, INTENT(IN):: tr(klon, klev) ! la q. de traceurs |
27 |
|
|
REAL, INTENT(IN):: flux(klon) ! le flux de traceurs a la surface |
28 |
|
|
REAL, INTENT(IN):: paprs(klon, klev+1) ! pression a inter-couche (Pa) |
29 |
|
|
REAL, INTENT(IN):: pplay(klon, klev) ! pression au milieu de couche (Pa) |
30 |
|
|
REAL, INTENT(IN):: delp(klon, klev) ! epaisseur de couche (Pa) |
31 |
|
|
REAL, INTENT(out):: d_tr(klon, klev) ! le changement de tr |
32 |
|
|
|
33 |
|
|
! Local: |
34 |
|
|
|
35 |
|
|
real tr0(klon) |
36 |
|
|
! tr0 traceurs a la surface ou dans l'ocean (non active) |
37 |
|
|
|
38 |
guez |
120 |
INTEGER i, k |
39 |
|
|
REAL zx_ctr(klon, 2:klev) |
40 |
|
|
REAL zx_dtr(klon, 2:klev) |
41 |
|
|
REAL zx_buf(klon) |
42 |
|
|
REAL zx_coef(klon, klev) |
43 |
|
|
REAL local_tr(klon, klev) |
44 |
|
|
REAL zx_alf1(klon), zx_alf2(klon), zx_flux(klon) |
45 |
guez |
270 |
|
46 |
|
|
!----------------------------------------------------------------------- |
47 |
|
|
|
48 |
guez |
120 |
DO k = 1, klev |
49 |
|
|
DO i = 1, klon |
50 |
|
|
local_tr(i, k) = tr(i, k) |
51 |
|
|
END DO |
52 |
guez |
81 |
END DO |
53 |
|
|
|
54 |
|
|
DO i = 1, klon |
55 |
guez |
270 |
zx_alf1(i) = (paprs(i, 1)-pplay(i, 2))/(pplay(i, 1)-pplay(i, 2)) |
56 |
guez |
120 |
zx_alf2(i) = 1.0 - zx_alf1(i) |
57 |
|
|
zx_flux(i) = -flux(i)*dtime*rg |
58 |
guez |
270 |
! pour le moment le flux est prescrit |
59 |
|
|
! zx_coef(1) vaut 0 |
60 |
guez |
120 |
tr0(i) = 0.0 |
61 |
guez |
270 |
zx_coef(i, 1) = 0. |
62 |
guez |
81 |
END DO |
63 |
guez |
270 |
|
64 |
guez |
120 |
DO k = 2, klev |
65 |
|
|
DO i = 1, klon |
66 |
guez |
270 |
zx_coef(i, k) = coef(i, k)*rg/(pplay(i, k-1)-pplay(i, k))* & |
67 |
|
|
(paprs(i, k)*2/(t(i, k)+t(i, k-1))/rd)**2 |
68 |
guez |
120 |
zx_coef(i, k) = zx_coef(i, k)*dtime*rg |
69 |
|
|
END DO |
70 |
|
|
END DO |
71 |
guez |
270 |
|
72 |
guez |
81 |
DO i = 1, klon |
73 |
guez |
120 |
zx_buf(i) = delp(i, 1) + zx_coef(i, 1)*zx_alf1(i) + zx_coef(i, 2) |
74 |
guez |
270 |
zx_ctr(i, 2) = (local_tr(i, 1)*delp(i, 1)+zx_coef(i, 1)*tr0(i)-zx_flux(i))/ & |
75 |
guez |
120 |
zx_buf(i) |
76 |
guez |
270 |
zx_dtr(i, 2) = (zx_coef(i, 2)-zx_alf2(i)*zx_coef(i, 1))/zx_buf(i) |
77 |
guez |
81 |
END DO |
78 |
guez |
120 |
|
79 |
|
|
DO k = 3, klev |
80 |
|
|
DO i = 1, klon |
81 |
|
|
zx_buf(i) = delp(i, k-1) + zx_coef(i, k) + zx_coef(i, k-1)*(1.-zx_dtr(i & |
82 |
guez |
270 |
, k-1)) |
83 |
|
|
zx_ctr(i, k) = (local_tr(i, k-1)*delp(i, k-1)+zx_coef(i, k-1)*zx_ctr(i, k-1 & |
84 |
guez |
120 |
))/zx_buf(i) |
85 |
|
|
zx_dtr(i, k) = zx_coef(i, k)/zx_buf(i) |
86 |
|
|
END DO |
87 |
|
|
END DO |
88 |
guez |
81 |
DO i = 1, klon |
89 |
guez |
270 |
local_tr(i, klev) = (local_tr(i, klev)*delp(i, klev)+zx_coef(i, klev)*zx_ctr & |
90 |
|
|
(i, klev))/(delp(i, klev)+zx_coef(i, klev)-zx_coef(i, klev)*zx_dtr(i, klev)) |
91 |
guez |
81 |
END DO |
92 |
guez |
120 |
DO k = klev - 1, 1, -1 |
93 |
|
|
DO i = 1, klon |
94 |
|
|
local_tr(i, k) = zx_ctr(i, k+1) + zx_dtr(i, k+1)*local_tr(i, k+1) |
95 |
|
|
END DO |
96 |
|
|
END DO |
97 |
guez |
270 |
|
98 |
guez |
120 |
DO k = 1, klev |
99 |
|
|
DO i = 1, klon |
100 |
|
|
d_tr(i, k) = local_tr(i, k) - tr(i, k) |
101 |
|
|
END DO |
102 |
|
|
END DO |
103 |
guez |
81 |
|
104 |
guez |
120 |
RETURN |
105 |
|
|
END SUBROUTINE cltrac |
106 |
|
|
|
107 |
|
|
end module cltrac_m |