4 |
|
|
5 |
contains |
contains |
6 |
|
|
7 |
SUBROUTINE fonte_neige(nisurf, dtime, tsurf, p1lay, beta, coef1lay, ps, & |
SUBROUTINE fonte_neige(nisurf, dtime, precip_rain, precip_snow, snow, qsol, & |
8 |
precip_rain, precip_snow, snow, qsol, t1lay, q1lay, u1lay, v1lay, & |
tsurf_new, evap, fqcalving, ffonte, run_off_lic_0) |
|
petAcoef, peqAcoef, petBcoef, peqBcoef, tsurf_new, evap, fqcalving, & |
|
|
ffonte, run_off_lic_0) |
|
9 |
|
|
10 |
! Routine de traitement de la fonte de la neige dans le cas du traitement |
! Routine de traitement de la fonte de la neige dans le cas du traitement |
11 |
! de sol simplifi\'e |
! de sol simplifi\'e |
12 |
|
|
13 |
! LF 03/2001 |
! Laurent Fairhead, March, 2001 |
14 |
|
|
|
USE fcttre, ONLY: foeew, qsatl, qsats, thermcep |
|
15 |
USE indicesol, ONLY: epsfra, is_lic, is_sic, is_ter |
USE indicesol, ONLY: epsfra, is_lic, is_sic, is_ter |
16 |
USE interface_surf, ONLY: run_off, run_off_lic, tau_calv |
USE interface_surf, ONLY: tau_calv |
17 |
use nr_util, only: assert_eq |
use nr_util, only: assert_eq |
18 |
USE suphec_m, ONLY: rcpd, rday, retv, rlmlt, rlstt, rlvtt, rtt |
USE suphec_m, ONLY: rday, rlmlt, rtt |
|
USE yoethf_m, ONLY: r2es, r5ies, r5les, rvtmp2 |
|
19 |
|
|
20 |
integer, intent(IN):: nisurf ! surface \`a traiter |
integer, intent(IN):: nisurf ! surface \`a traiter |
21 |
real, intent(IN):: dtime ! pas de temps de la physique (en s) |
real, intent(IN):: dtime ! pas de temps de la physique (en s) |
|
real, dimension(:), intent(IN):: tsurf, p1lay, beta, coef1lay ! (knon) |
|
|
! tsurf temperature de surface |
|
|
! p1lay pression 1er niveau (milieu de couche) |
|
|
! beta evap reelle |
|
|
! coef1lay coefficient d'echange |
|
|
real, dimension(:), intent(IN):: ps ! (knon) |
|
|
! ps pression au sol |
|
22 |
|
|
23 |
real, intent(IN):: precip_rain(:) ! (knon) |
real, intent(IN):: precip_rain(:) ! (knon) |
24 |
! precipitation, liquid water mass flux (kg/m2/s), positive down |
! precipitation, liquid water mass flux (kg / m2 / s), positive down |
25 |
|
|
26 |
real, intent(IN):: precip_snow(:) ! (knon) |
real, intent(IN):: precip_snow(:) ! (knon) |
27 |
! precipitation, solid water mass flux (kg/m2/s), positive down |
! precipitation, solid water mass flux (kg / m2 / s), positive down |
28 |
|
|
29 |
real, intent(INOUT):: snow(:) ! (knon) |
real, intent(INOUT):: snow(:) ! (knon) |
30 |
! column-density of mass of snow, in kg m-2 |
! column-density of mass of snow, in kg m-2 |
32 |
real, intent(INOUT):: qsol(:) ! (knon) |
real, intent(INOUT):: qsol(:) ! (knon) |
33 |
! column-density of water in soil, in kg m-2 |
! column-density of water in soil, in kg m-2 |
34 |
|
|
35 |
real, dimension(:), intent(IN):: t1lay ! (knon) |
real, intent(INOUT):: tsurf_new(:) ! (knon) temp\'erature au sol |
|
real, dimension(:), intent(IN):: q1lay ! (knon) |
|
|
real, dimension(:), intent(IN):: u1lay, v1lay ! (knon) |
|
|
real, dimension(:), intent(IN):: petAcoef, peqAcoef ! (knon) |
|
|
! petAcoef coeff. A de la resolution de la CL pour t |
|
|
! peqAcoef coeff. A de la resolution de la CL pour q |
|
|
real, dimension(:), intent(IN):: petBcoef, peqBcoef ! (knon) |
|
|
! petBcoef coeff. B de la resolution de la CL pour t |
|
|
! peqBcoef coeff. B de la resolution de la CL pour q |
|
|
|
|
|
real, intent(INOUT):: tsurf_new(:) |
|
|
! tsurf_new temperature au sol |
|
|
|
|
36 |
real, intent(IN):: evap(:) ! (knon) |
real, intent(IN):: evap(:) ! (knon) |
37 |
|
|
|
! Flux d'eau "perdue" par la surface et necessaire pour que limiter la |
|
|
! hauteur de neige, en kg/m2/s |
|
38 |
real, intent(OUT):: fqcalving(:) ! (knon) |
real, intent(OUT):: fqcalving(:) ! (knon) |
39 |
|
! flux d'eau "perdue" par la surface et n\'ecessaire pour limiter la |
40 |
|
! hauteur de neige, en kg / m2 / s |
41 |
|
|
|
! Flux thermique utiliser pour fondre la neige |
|
42 |
real, intent(OUT):: ffonte(:) ! (knon) |
real, intent(OUT):: ffonte(:) ! (knon) |
43 |
|
! flux thermique utilis\'é pour fondre la neige |
44 |
|
|
45 |
real, dimension(:), intent(INOUT):: run_off_lic_0 ! (knon) |
real, intent(INOUT):: run_off_lic_0(:) ! (knon) |
46 |
! run_off_lic_0 run off glacier du pas de temps pr\'ecedent |
! run off glacier du pas de temps pr\'ecedent |
47 |
|
|
48 |
! Local: |
! Local: |
49 |
|
|
50 |
integer knon ! nombre de points \`a traiter |
integer knon ! nombre de points \`a traiter |
51 |
real, parameter:: snow_max=3000. |
real, parameter:: snow_max=3000. |
52 |
! Masse maximum de neige (kg/m2). Au dessus de ce seuil, la neige |
! Masse maximum de neige (kg / m2). Au dessus de ce seuil, la neige |
53 |
! en exces "s'ecoule" (calving) |
! en exces "s'\'ecoule" (calving). |
54 |
|
|
55 |
integer i |
integer i |
|
logical zdelta |
|
|
real zcvm5, zx_qs, zcor |
|
56 |
real fq_fonte |
real fq_fonte |
57 |
REAL bil_eau_s(size(ps)) ! in kg m-2 |
REAL bil_eau_s(size(precip_rain)) ! (knon) in kg m-2 |
58 |
real snow_evap(size(ps)) ! in kg m-2 s-1 |
real snow_evap(size(precip_rain)) ! (knon) in kg m-2 s-1 |
59 |
real, parameter:: t_grnd = 271.35, t_coup = 273.15 |
REAL, parameter:: chasno = 3.334E5 / (2.3867E6 * 0.15) |
60 |
REAL, parameter:: chasno = 3.334E5/(2.3867E6*0.15) |
REAL, parameter:: chaice = 3.334E5 / (2.3867E6 * 0.15) |
|
REAL, parameter:: chaice = 3.334E5/(2.3867E6*0.15) |
|
61 |
real, parameter:: max_eau_sol = 150. ! in kg m-2 |
real, parameter:: max_eau_sol = 150. ! in kg m-2 |
62 |
real coeff_rel |
real coeff_rel |
63 |
|
REAL, ALLOCATABLE, SAVE:: run_off_lic(:) ! ruissellement total |
64 |
|
|
65 |
!-------------------------------------------------------------------- |
!-------------------------------------------------------------------- |
66 |
|
|
67 |
knon = assert_eq((/size(tsurf), size(p1lay), size(beta), size(coef1lay), & |
knon = assert_eq((/size(precip_rain), size(precip_snow), size(snow), & |
68 |
size(ps), size(precip_rain), size(precip_snow), size(snow), & |
size(qsol), size(tsurf_new), size(evap), size(fqcalving), & |
69 |
size(qsol), size(t1lay), size(q1lay), size(u1lay), size(v1lay), & |
size(ffonte), size(run_off_lic_0)/), "fonte_neige knon") |
|
size(petAcoef), size(peqAcoef), size(petBcoef), size(peqBcoef), & |
|
|
size(tsurf_new), size(evap), size(fqcalving), size(ffonte), & |
|
|
size(run_off_lic_0)/), "fonte_neige knon") |
|
|
|
|
|
! Initialisations |
|
|
coeff_rel = dtime/(tau_calv * rday) |
|
|
bil_eau_s = 0. |
|
|
DO i = 1, knon |
|
|
IF (thermcep) THEN |
|
|
zdelta= rtt >= tsurf(i) |
|
|
zcvm5 = merge(R5IES*RLSTT, R5LES*RLVTT, zdelta) |
|
|
zcvm5 = zcvm5 / RCPD / (1. + RVTMP2*q1lay(i)) |
|
|
zx_qs= r2es * FOEEW(tsurf(i), zdelta)/ps(i) |
|
|
zx_qs=MIN(0.5, zx_qs) |
|
|
zcor=1./(1.-retv*zx_qs) |
|
|
zx_qs=zx_qs*zcor |
|
|
ELSE |
|
|
IF (tsurf(i) < t_coup) THEN |
|
|
zx_qs = qsats(tsurf(i)) / ps(i) |
|
|
ELSE |
|
|
zx_qs = qsatl(tsurf(i)) / ps(i) |
|
|
ENDIF |
|
|
ENDIF |
|
|
ENDDO |
|
|
|
|
|
! Calcul de la temperature de surface |
|
70 |
|
|
71 |
|
coeff_rel = dtime / (tau_calv * rday) |
72 |
WHERE (precip_snow > 0.) snow = snow + precip_snow * dtime |
WHERE (precip_snow > 0.) snow = snow + precip_snow * dtime |
73 |
|
|
74 |
WHERE (evap > 0.) |
WHERE (evap > 0.) |
79 |
snow_evap = 0. |
snow_evap = 0. |
80 |
end where |
end where |
81 |
|
|
82 |
bil_eau_s = precip_rain * dtime - (evap(:knon) - snow_evap(:knon)) * dtime |
bil_eau_s = (precip_rain - evap + snow_evap) * dtime |
83 |
|
|
84 |
! Y'a-t-il fonte de neige? |
! Y a-t-il fonte de neige ? |
85 |
|
|
|
ffonte=0. |
|
86 |
do i = 1, knon |
do i = 1, knon |
87 |
if ((snow(i) > epsfra .OR. nisurf == is_sic & |
if ((snow(i) > epsfra .OR. nisurf == is_sic & |
88 |
.OR. nisurf == is_lic) .AND. tsurf_new(i) >= RTT) then |
.OR. nisurf == is_lic) .AND. tsurf_new(i) >= RTT) then |
89 |
fq_fonte = MIN(MAX((tsurf_new(i)-RTT)/chasno, 0.), snow(i)) |
fq_fonte = MIN(MAX((tsurf_new(i) - RTT) / chasno, 0.), snow(i)) |
90 |
ffonte(i) = fq_fonte * RLMLT/dtime |
ffonte(i) = fq_fonte * RLMLT / dtime |
91 |
snow(i) = max(0., snow(i) - fq_fonte) |
snow(i) = max(0., snow(i) - fq_fonte) |
92 |
bil_eau_s(i) = bil_eau_s(i) + fq_fonte |
bil_eau_s(i) = bil_eau_s(i) + fq_fonte |
93 |
tsurf_new(i) = tsurf_new(i) - fq_fonte * chasno |
tsurf_new(i) = tsurf_new(i) - fq_fonte * chasno |
94 |
!IM cf JLD/ GKtest fonte aussi pour la glace |
|
95 |
|
!IM cf. JLD/ GKtest fonte aussi pour la glace |
96 |
IF (nisurf == is_sic .OR. nisurf == is_lic) THEN |
IF (nisurf == is_sic .OR. nisurf == is_lic) THEN |
97 |
fq_fonte = MAX((tsurf_new(i)-RTT)/chaice, 0.) |
fq_fonte = MAX((tsurf_new(i) - RTT) / chaice, 0.) |
98 |
ffonte(i) = ffonte(i) + fq_fonte * RLMLT/dtime |
ffonte(i) = ffonte(i) + fq_fonte * RLMLT / dtime |
99 |
bil_eau_s(i) = bil_eau_s(i) + fq_fonte |
bil_eau_s(i) = bil_eau_s(i) + fq_fonte |
100 |
tsurf_new(i) = RTT |
tsurf_new(i) = RTT |
101 |
ENDIF |
ENDIF |
102 |
|
else |
103 |
|
ffonte(i) = 0. |
104 |
endif |
endif |
105 |
|
|
106 |
! S'il y a une hauteur trop importante de neige, elle s'\'ecoule |
! S'il y a une hauteur trop importante de neige, elle s'\'ecoule |
107 |
fqcalving(i) = max(0., snow(i) - snow_max)/dtime |
fqcalving(i) = max(0., snow(i) - snow_max) / dtime |
108 |
snow(i)=min(snow(i), snow_max) |
snow(i) = min(snow(i), snow_max) |
109 |
|
enddo |
110 |
|
|
111 |
|
IF (nisurf == is_ter) then |
112 |
|
qsol = MIN(qsol + bil_eau_s, max_eau_sol) |
113 |
|
else if (nisurf == is_lic) then |
114 |
|
if (.not. allocated(run_off_lic)) allocate(run_off_lic(knon)) |
115 |
|
! assumes that the fraction of land-ice does not change during the run |
116 |
|
|
117 |
IF (nisurf == is_ter) then |
do i = 1, knon |
|
qsol(i) = qsol(i) + bil_eau_s(i) |
|
|
run_off(i) = run_off(i) + MAX(qsol(i) - max_eau_sol, 0.) |
|
|
qsol(i) = MIN(qsol(i), max_eau_sol) |
|
|
else if (nisurf == is_lic) then |
|
118 |
run_off_lic(i) = (coeff_rel * fqcalving(i)) + & |
run_off_lic(i) = (coeff_rel * fqcalving(i)) + & |
119 |
(1. - coeff_rel) * run_off_lic_0(i) |
(1. - coeff_rel) * run_off_lic_0(i) |
120 |
run_off_lic_0(i) = run_off_lic(i) |
run_off_lic_0(i) = run_off_lic(i) |
121 |
run_off_lic(i) = run_off_lic(i) + bil_eau_s(i)/dtime |
run_off_lic(i) = run_off_lic(i) + bil_eau_s(i) / dtime |
122 |
endif |
enddo |
123 |
enddo |
endif |
124 |
|
|
125 |
END SUBROUTINE fonte_neige |
END SUBROUTINE fonte_neige |
126 |
|
|