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guez |
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module fonte_neige_m |
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implicit none |
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contains |
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SUBROUTINE fonte_neige( klon, knon, nisurf, dtime, & |
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tsurf, p1lay, cal, beta, coef1lay, ps, & |
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precip_rain, precip_snow, snow, qsol, & |
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radsol, dif_grnd, t1lay, q1lay, u1lay, v1lay, & |
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petAcoef, peqAcoef, petBcoef, peqBcoef, & |
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tsurf_new, evap, fluxlat, fluxsens, dflux_s, dflux_l, & |
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fqcalving, ffonte, run_off_lic_0) |
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! Routine de traitement de la fonte de la neige dans le cas du traitement |
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! de sol simplifié |
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! LF 03/2001 |
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! input: |
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! knon nombre de points a traiter |
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! nisurf surface a traiter |
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! tsurf temperature de surface |
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! p1lay pression 1er niveau (milieu de couche) |
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! cal capacite calorifique du sol |
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! beta evap reelle |
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! coef1lay coefficient d'echange |
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! ps pression au sol |
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! precip_rain precipitations liquides |
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! precip_snow precipitations solides |
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! snow champs hauteur de neige |
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! qsol hauteur d'eau contenu dans le sol |
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! runoff runoff en cas de trop plein |
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! petAcoef coeff. A de la resolution de la CL pour t |
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! peqAcoef coeff. A de la resolution de la CL pour q |
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! petBcoef coeff. B de la resolution de la CL pour t |
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! peqBcoef coeff. B de la resolution de la CL pour q |
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! radsol rayonnement net aus sol (LW + SW) |
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! dif_grnd coeff. diffusion vers le sol profond |
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! output: |
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! tsurf_new temperature au sol |
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! fluxsens flux de chaleur sensible |
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! fluxlat flux de chaleur latente |
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! dflux_s derivee du flux de chaleur sensible / Ts |
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! dflux_l derivee du flux de chaleur latente / Ts |
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! in/out: |
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! run_off_lic_0 run off glacier du pas de temps précedent |
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use indicesol |
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use SUPHEC_M |
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use yoethf_m |
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use fcttre |
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use interface_surf |
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!IM cf JLD |
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! Parametres d'entree |
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integer, intent(IN) :: knon, nisurf, klon |
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real , intent(IN) :: dtime |
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real, dimension(klon), intent(IN) :: petAcoef, peqAcoef |
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real, dimension(klon), intent(IN) :: petBcoef, peqBcoef |
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real, dimension(klon), intent(IN) :: ps, q1lay |
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real, dimension(klon), intent(IN) :: tsurf, p1lay, cal, beta, coef1lay |
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real, dimension(klon), intent(IN) :: precip_rain, precip_snow |
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real, dimension(klon), intent(IN) :: radsol, dif_grnd |
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real, dimension(klon), intent(IN) :: t1lay, u1lay, v1lay |
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real, dimension(klon), intent(INOUT) :: snow, qsol |
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! Parametres sorties |
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real, dimension(klon), intent(INOUT):: tsurf_new, evap, fluxsens, fluxlat |
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real, dimension(klon), intent(INOUT):: dflux_s, dflux_l |
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! Flux thermique utiliser pour fondre la neige |
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real, dimension(klon), intent(INOUT):: ffonte |
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! Flux d'eau "perdue" par la surface et necessaire pour que limiter la |
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! hauteur de neige, en kg/m2/s |
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real, dimension(klon), intent(INOUT):: fqcalving |
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real, dimension(klon), intent(INOUT):: run_off_lic_0 |
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! Variables locales |
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! Masse maximum de neige (kg/m2). Au dessus de ce seuil, la neige |
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! en exces "s'ecoule" (calving) |
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! real, parameter :: snow_max=1. |
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!IM cf JLD/GK |
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real, parameter :: snow_max=3000. |
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integer :: i |
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real, dimension(klon) :: zx_mh, zx_nh, zx_oh |
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real, dimension(klon) :: zx_mq, zx_nq, zx_oq |
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real, dimension(klon) :: zx_pkh, zx_dq_s_dt, zx_qsat, zx_coef |
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real, dimension(klon) :: zx_sl, zx_k1 |
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real, dimension(klon) :: zx_q_0 , d_ts |
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real :: zdelta, zcvm5, zx_qs, zcor, zx_dq_s_dh |
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real :: bilan_f, fq_fonte |
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REAL :: subli, fsno |
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REAL, DIMENSION(klon) :: bil_eau_s, snow_evap |
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real, parameter :: t_grnd = 271.35, t_coup = 273.15 |
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!! PB temporaire en attendant mieux pour le modele de neige |
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! REAL, parameter :: chasno = RLMLT/(2.3867E+06*0.15) |
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REAL, parameter :: chasno = 3.334E+05/(2.3867E+06*0.15) |
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!IM cf JLD/ GKtest |
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REAL, parameter :: chaice = 3.334E+05/(2.3867E+06*0.15) |
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! fin GKtest |
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logical, save :: check = .FALSE. |
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character (len = 20) :: modname = 'fonte_neige' |
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logical, save :: neige_fond = .false. |
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real, save :: max_eau_sol = 150.0 |
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character (len = 80) :: abort_message |
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logical, save :: first = .true., second=.false. |
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real :: coeff_rel |
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if (check) write(*, *)'Entree ', modname, ' surface = ', nisurf |
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! Initialisations |
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coeff_rel = dtime/(tau_calv * rday) |
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bil_eau_s = 0. |
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DO i = 1, knon |
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zx_pkh(i) = (ps(i)/ps(i))**RKAPPA |
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IF (thermcep) THEN |
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zdelta=MAX(0., SIGN(1., rtt-tsurf(i))) |
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zcvm5 = R5LES*RLVTT*(1.-zdelta) + R5IES*RLSTT*zdelta |
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zcvm5 = zcvm5 / RCPD / (1.0+RVTMP2*q1lay(i)) |
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zx_qs= r2es * FOEEW(tsurf(i), zdelta)/ps(i) |
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zx_qs=MIN(0.5, zx_qs) |
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zcor=1./(1.-retv*zx_qs) |
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zx_qs=zx_qs*zcor |
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zx_dq_s_dh = FOEDE(tsurf(i), zdelta, zcvm5, zx_qs, zcor) & |
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/RLVTT / zx_pkh(i) |
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ELSE |
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IF (tsurf(i).LT.t_coup) THEN |
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zx_qs = qsats(tsurf(i)) / ps(i) |
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zx_dq_s_dh = dqsats(tsurf(i), zx_qs)/RLVTT & |
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/ zx_pkh(i) |
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ELSE |
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zx_qs = qsatl(tsurf(i)) / ps(i) |
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zx_dq_s_dh = dqsatl(tsurf(i), zx_qs)/RLVTT & |
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/ zx_pkh(i) |
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ENDIF |
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ENDIF |
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zx_dq_s_dt(i) = RCPD * zx_pkh(i) * zx_dq_s_dh |
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zx_qsat(i) = zx_qs |
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zx_coef(i) = coef1lay(i) & |
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* (1.0+SQRT(u1lay(i)**2+v1lay(i)**2)) & |
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* p1lay(i)/(RD*t1lay(i)) |
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ENDDO |
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! === Calcul de la temperature de surface === |
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! zx_sl = chaleur latente d'evaporation ou de sublimation |
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do i = 1, knon |
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zx_sl(i) = RLVTT |
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if (tsurf(i) .LT. RTT) zx_sl(i) = RLSTT |
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zx_k1(i) = zx_coef(i) |
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enddo |
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do i = 1, knon |
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! Q |
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zx_oq(i) = 1. - (beta(i) * zx_k1(i) * peqBcoef(i) * dtime) |
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zx_mq(i) = beta(i) * zx_k1(i) * & |
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(peqAcoef(i) - zx_qsat(i) & |
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+ zx_dq_s_dt(i) * tsurf(i)) & |
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/ zx_oq(i) |
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zx_nq(i) = beta(i) * zx_k1(i) * (-1. * zx_dq_s_dt(i)) & |
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/ zx_oq(i) |
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! H |
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zx_oh(i) = 1. - (zx_k1(i) * petBcoef(i) * dtime) |
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zx_mh(i) = zx_k1(i) * petAcoef(i) / zx_oh(i) |
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zx_nh(i) = - (zx_k1(i) * RCPD * zx_pkh(i))/ zx_oh(i) |
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enddo |
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WHERE (precip_snow > 0.) snow = snow + (precip_snow * dtime) |
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snow_evap = 0. |
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WHERE (evap > 0. ) |
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snow_evap = MIN (snow / dtime, evap) |
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snow = snow - snow_evap * dtime |
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snow = MAX(0.0, snow) |
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end where |
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! bil_eau_s = bil_eau_s + (precip_rain * dtime) - (evap - snow_evap) * dtime |
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bil_eau_s = (precip_rain * dtime) - (evap - snow_evap) * dtime |
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! Y'a-t-il fonte de neige? |
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ffonte=0. |
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do i = 1, knon |
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neige_fond = ((snow(i) > epsfra .OR. nisurf == is_sic .OR. nisurf == is_lic) & |
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.AND. tsurf_new(i) >= RTT) |
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if (neige_fond) then |
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fq_fonte = MIN( MAX((tsurf_new(i)-RTT )/chasno, 0.0), snow(i)) |
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ffonte(i) = fq_fonte * RLMLT/dtime |
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snow(i) = max(0., snow(i) - fq_fonte) |
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bil_eau_s(i) = bil_eau_s(i) + fq_fonte |
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tsurf_new(i) = tsurf_new(i) - fq_fonte * chasno |
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!IM cf JLD OK |
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!IM cf JLD/ GKtest fonte aussi pour la glace |
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IF (nisurf == is_sic .OR. nisurf == is_lic ) THEN |
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fq_fonte = MAX((tsurf_new(i)-RTT )/chaice, 0.0) |
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ffonte(i) = ffonte(i) + fq_fonte * RLMLT/dtime |
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bil_eau_s(i) = bil_eau_s(i) + fq_fonte |
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tsurf_new(i) = RTT |
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ENDIF |
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d_ts(i) = tsurf_new(i) - tsurf(i) |
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endif |
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! s'il y a une hauteur trop importante de neige, elle s'coule |
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fqcalving(i) = max(0., snow(i) - snow_max)/dtime |
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snow(i)=min(snow(i), snow_max) |
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IF (nisurf == is_ter) then |
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qsol(i) = qsol(i) + bil_eau_s(i) |
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run_off(i) = run_off(i) + MAX(qsol(i) - max_eau_sol, 0.0) |
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qsol(i) = MIN(qsol(i), max_eau_sol) |
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else if (nisurf == is_lic) then |
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run_off_lic(i) = (coeff_rel * fqcalving(i)) + & |
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(1. - coeff_rel) * run_off_lic_0(i) |
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run_off_lic_0(i) = run_off_lic(i) |
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run_off_lic(i) = run_off_lic(i) + bil_eau_s(i)/dtime |
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endif |
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enddo |
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END SUBROUTINE fonte_neige |
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end module fonte_neige_m |
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