1 |
guez |
54 |
module fonte_neige_m |
2 |
|
|
|
3 |
|
|
implicit none |
4 |
|
|
|
5 |
|
|
contains |
6 |
|
|
|
7 |
guez |
101 |
SUBROUTINE fonte_neige(klon, knon, nisurf, dtime, tsurf, p1lay, beta, & |
8 |
|
|
coef1lay, ps, precip_rain, precip_snow, snow, qsol, t1lay, q1lay, & |
9 |
|
|
u1lay, v1lay, petAcoef, peqAcoef, petBcoef, peqBcoef, tsurf_new, evap, & |
10 |
guez |
54 |
fqcalving, ffonte, run_off_lic_0) |
11 |
|
|
|
12 |
|
|
! Routine de traitement de la fonte de la neige dans le cas du traitement |
13 |
|
|
! de sol simplifié |
14 |
|
|
|
15 |
|
|
! LF 03/2001 |
16 |
guez |
101 |
|
17 |
|
|
USE fcttre, ONLY: dqsatl, dqsats, foede, foeew, qsatl, qsats, thermcep |
18 |
|
|
USE indicesol, ONLY: epsfra, is_lic, is_sic, is_ter |
19 |
|
|
USE interface_surf, ONLY: run_off, run_off_lic, tau_calv |
20 |
|
|
USE suphec_m, ONLY: rcpd, rd, rday, retv, rkappa, rlmlt, rlstt, rlvtt, rtt |
21 |
|
|
USE yoethf_m, ONLY: r2es, r5ies, r5les, rvtmp2 |
22 |
|
|
|
23 |
|
|
integer, intent(IN):: klon |
24 |
|
|
integer, intent(IN):: knon ! nombre de points à traiter |
25 |
|
|
integer, intent(IN):: nisurf ! surface à traiter |
26 |
|
|
real, intent(IN):: dtime ! pas de temps de la physique (en s) |
27 |
|
|
real, dimension(klon), intent(IN):: tsurf, p1lay, beta, coef1lay |
28 |
guez |
54 |
! tsurf temperature de surface |
29 |
|
|
! p1lay pression 1er niveau (milieu de couche) |
30 |
|
|
! beta evap reelle |
31 |
|
|
! coef1lay coefficient d'echange |
32 |
guez |
101 |
real, dimension(klon), intent(IN):: ps |
33 |
guez |
54 |
! ps pression au sol |
34 |
guez |
101 |
|
35 |
|
|
real, intent(IN):: precip_rain(:) ! (knon) |
36 |
|
|
! precipitation, liquid water mass flux (kg/m2/s), positive down |
37 |
|
|
|
38 |
|
|
real, intent(IN):: precip_snow(klon) |
39 |
|
|
! precipitation, solid water mass flux (kg/m2/s), positive down |
40 |
|
|
|
41 |
|
|
real, intent(INOUT):: snow(klon) ! column-density of mass of snow, in kg m-2 |
42 |
|
|
|
43 |
|
|
real, intent(INOUT):: qsol(:) ! (knon) |
44 |
|
|
! column-density of water in soil, in kg m-2 |
45 |
|
|
|
46 |
|
|
real, dimension(klon), intent(IN):: t1lay |
47 |
|
|
real, dimension(klon), intent(IN):: q1lay |
48 |
|
|
real, dimension(klon), intent(IN):: u1lay, v1lay |
49 |
|
|
real, dimension(klon), intent(IN):: petAcoef, peqAcoef |
50 |
guez |
54 |
! petAcoef coeff. A de la resolution de la CL pour t |
51 |
|
|
! peqAcoef coeff. A de la resolution de la CL pour q |
52 |
guez |
101 |
real, dimension(klon), intent(IN):: petBcoef, peqBcoef |
53 |
guez |
54 |
! petBcoef coeff. B de la resolution de la CL pour t |
54 |
|
|
! peqBcoef coeff. B de la resolution de la CL pour q |
55 |
|
|
|
56 |
guez |
101 |
real, intent(INOUT):: tsurf_new(klon), evap(klon) |
57 |
guez |
54 |
! tsurf_new temperature au sol |
58 |
|
|
|
59 |
guez |
101 |
! Flux d'eau "perdue" par la surface et necessaire pour que limiter la |
60 |
|
|
! hauteur de neige, en kg/m2/s |
61 |
|
|
real, dimension(klon), intent(INOUT):: fqcalving |
62 |
guez |
54 |
|
63 |
|
|
! Flux thermique utiliser pour fondre la neige |
64 |
|
|
real, dimension(klon), intent(INOUT):: ffonte |
65 |
guez |
101 |
|
66 |
guez |
54 |
real, dimension(klon), intent(INOUT):: run_off_lic_0 |
67 |
guez |
101 |
! run_off_lic_0 run off glacier du pas de temps précedent |
68 |
|
|
|
69 |
|
|
! Local: |
70 |
|
|
|
71 |
|
|
real, parameter:: snow_max=3000. |
72 |
guez |
54 |
! Masse maximum de neige (kg/m2). Au dessus de ce seuil, la neige |
73 |
|
|
! en exces "s'ecoule" (calving) |
74 |
|
|
|
75 |
guez |
101 |
integer i |
76 |
|
|
real, dimension(klon):: zx_mh, zx_nh, zx_oh |
77 |
|
|
real, dimension(klon):: zx_mq, zx_nq, zx_oq |
78 |
|
|
real, dimension(klon):: zx_pkh, zx_dq_s_dt, zx_qsat, zx_coef |
79 |
|
|
real, dimension(klon):: zx_sl, zx_k1 |
80 |
|
|
real, dimension(klon):: d_ts |
81 |
|
|
real zdelta, zcvm5, zx_qs, zcor, zx_dq_s_dh |
82 |
|
|
real fq_fonte |
83 |
|
|
REAL bil_eau_s(knon) ! in kg m-2 |
84 |
|
|
real snow_evap(klon) ! in kg m-2 s-1 |
85 |
|
|
real, parameter:: t_grnd = 271.35, t_coup = 273.15 |
86 |
|
|
REAL, parameter:: chasno = 3.334E5/(2.3867E6*0.15) |
87 |
|
|
REAL, parameter:: chaice = 3.334E5/(2.3867E6*0.15) |
88 |
|
|
real, parameter:: max_eau_sol = 150. ! in kg m-2 |
89 |
|
|
real coeff_rel |
90 |
guez |
54 |
|
91 |
guez |
101 |
!-------------------------------------------------------------------- |
92 |
guez |
54 |
|
93 |
|
|
! Initialisations |
94 |
|
|
coeff_rel = dtime/(tau_calv * rday) |
95 |
|
|
bil_eau_s = 0. |
96 |
|
|
DO i = 1, knon |
97 |
|
|
zx_pkh(i) = (ps(i)/ps(i))**RKAPPA |
98 |
|
|
IF (thermcep) THEN |
99 |
|
|
zdelta=MAX(0., SIGN(1., rtt-tsurf(i))) |
100 |
|
|
zcvm5 = R5LES*RLVTT*(1.-zdelta) + R5IES*RLSTT*zdelta |
101 |
guez |
101 |
zcvm5 = zcvm5 / RCPD / (1. + RVTMP2*q1lay(i)) |
102 |
guez |
54 |
zx_qs= r2es * FOEEW(tsurf(i), zdelta)/ps(i) |
103 |
|
|
zx_qs=MIN(0.5, zx_qs) |
104 |
|
|
zcor=1./(1.-retv*zx_qs) |
105 |
|
|
zx_qs=zx_qs*zcor |
106 |
guez |
101 |
zx_dq_s_dh = FOEDE(tsurf(i), zdelta, zcvm5, zx_qs, zcor) /RLVTT & |
107 |
|
|
/ zx_pkh(i) |
108 |
guez |
54 |
ELSE |
109 |
guez |
101 |
IF (tsurf(i) < t_coup) THEN |
110 |
guez |
54 |
zx_qs = qsats(tsurf(i)) / ps(i) |
111 |
guez |
101 |
zx_dq_s_dh = dqsats(tsurf(i), zx_qs)/RLVTT / zx_pkh(i) |
112 |
guez |
54 |
ELSE |
113 |
|
|
zx_qs = qsatl(tsurf(i)) / ps(i) |
114 |
guez |
101 |
zx_dq_s_dh = dqsatl(tsurf(i), zx_qs)/RLVTT / zx_pkh(i) |
115 |
guez |
54 |
ENDIF |
116 |
|
|
ENDIF |
117 |
|
|
zx_dq_s_dt(i) = RCPD * zx_pkh(i) * zx_dq_s_dh |
118 |
|
|
zx_qsat(i) = zx_qs |
119 |
guez |
101 |
zx_coef(i) = coef1lay(i) * (1. + SQRT(u1lay(i)**2 + v1lay(i)**2)) & |
120 |
|
|
* p1lay(i) / (RD * t1lay(i)) |
121 |
guez |
54 |
ENDDO |
122 |
|
|
|
123 |
guez |
101 |
! Calcul de la temperature de surface |
124 |
guez |
54 |
|
125 |
|
|
! zx_sl = chaleur latente d'evaporation ou de sublimation |
126 |
|
|
|
127 |
|
|
do i = 1, knon |
128 |
|
|
zx_sl(i) = RLVTT |
129 |
guez |
101 |
if (tsurf(i) < RTT) zx_sl(i) = RLSTT |
130 |
guez |
54 |
zx_k1(i) = zx_coef(i) |
131 |
|
|
enddo |
132 |
|
|
|
133 |
|
|
do i = 1, knon |
134 |
|
|
! Q |
135 |
|
|
zx_oq(i) = 1. - (beta(i) * zx_k1(i) * peqBcoef(i) * dtime) |
136 |
guez |
101 |
zx_mq(i) = beta(i) * zx_k1(i) * (peqAcoef(i) - zx_qsat(i) & |
137 |
|
|
+ zx_dq_s_dt(i) * tsurf(i)) / zx_oq(i) |
138 |
|
|
zx_nq(i) = beta(i) * zx_k1(i) * (-1. * zx_dq_s_dt(i)) / zx_oq(i) |
139 |
guez |
54 |
|
140 |
|
|
! H |
141 |
|
|
zx_oh(i) = 1. - (zx_k1(i) * petBcoef(i) * dtime) |
142 |
|
|
zx_mh(i) = zx_k1(i) * petAcoef(i) / zx_oh(i) |
143 |
|
|
zx_nh(i) = - (zx_k1(i) * RCPD * zx_pkh(i))/ zx_oh(i) |
144 |
|
|
enddo |
145 |
|
|
|
146 |
guez |
101 |
WHERE (precip_snow > 0.) snow = snow + precip_snow * dtime |
147 |
|
|
|
148 |
|
|
WHERE (evap > 0.) |
149 |
guez |
54 |
snow_evap = MIN (snow / dtime, evap) |
150 |
|
|
snow = snow - snow_evap * dtime |
151 |
guez |
101 |
snow = MAX(0., snow) |
152 |
|
|
elsewhere |
153 |
|
|
snow_evap = 0. |
154 |
guez |
54 |
end where |
155 |
|
|
|
156 |
guez |
101 |
bil_eau_s = precip_rain * dtime - (evap(:knon) - snow_evap(:knon)) * dtime |
157 |
guez |
54 |
|
158 |
|
|
! Y'a-t-il fonte de neige? |
159 |
|
|
|
160 |
|
|
ffonte=0. |
161 |
|
|
do i = 1, knon |
162 |
guez |
101 |
if ((snow(i) > epsfra .OR. nisurf == is_sic & |
163 |
|
|
.OR. nisurf == is_lic) .AND. tsurf_new(i) >= RTT) then |
164 |
|
|
fq_fonte = MIN(MAX((tsurf_new(i)-RTT)/chasno, 0.), snow(i)) |
165 |
guez |
54 |
ffonte(i) = fq_fonte * RLMLT/dtime |
166 |
|
|
snow(i) = max(0., snow(i) - fq_fonte) |
167 |
|
|
bil_eau_s(i) = bil_eau_s(i) + fq_fonte |
168 |
|
|
tsurf_new(i) = tsurf_new(i) - fq_fonte * chasno |
169 |
|
|
!IM cf JLD/ GKtest fonte aussi pour la glace |
170 |
guez |
101 |
IF (nisurf == is_sic .OR. nisurf == is_lic) THEN |
171 |
|
|
fq_fonte = MAX((tsurf_new(i)-RTT)/chaice, 0.) |
172 |
guez |
54 |
ffonte(i) = ffonte(i) + fq_fonte * RLMLT/dtime |
173 |
|
|
bil_eau_s(i) = bil_eau_s(i) + fq_fonte |
174 |
|
|
tsurf_new(i) = RTT |
175 |
|
|
ENDIF |
176 |
|
|
d_ts(i) = tsurf_new(i) - tsurf(i) |
177 |
|
|
endif |
178 |
|
|
|
179 |
guez |
101 |
! S'il y a une hauteur trop importante de neige, elle s'écoule |
180 |
guez |
54 |
fqcalving(i) = max(0., snow(i) - snow_max)/dtime |
181 |
|
|
snow(i)=min(snow(i), snow_max) |
182 |
|
|
|
183 |
|
|
IF (nisurf == is_ter) then |
184 |
|
|
qsol(i) = qsol(i) + bil_eau_s(i) |
185 |
guez |
101 |
run_off(i) = run_off(i) + MAX(qsol(i) - max_eau_sol, 0.) |
186 |
guez |
54 |
qsol(i) = MIN(qsol(i), max_eau_sol) |
187 |
|
|
else if (nisurf == is_lic) then |
188 |
|
|
run_off_lic(i) = (coeff_rel * fqcalving(i)) + & |
189 |
|
|
(1. - coeff_rel) * run_off_lic_0(i) |
190 |
|
|
run_off_lic_0(i) = run_off_lic(i) |
191 |
|
|
run_off_lic(i) = run_off_lic(i) + bil_eau_s(i)/dtime |
192 |
|
|
endif |
193 |
|
|
enddo |
194 |
|
|
|
195 |
|
|
END SUBROUTINE fonte_neige |
196 |
|
|
|
197 |
|
|
end module fonte_neige_m |