--- trunk/Sources/phylmd/Interface_surf/fonte_neige.f 2016/03/22 16:31:39 188 +++ trunk/Sources/phylmd/Interface_surf/fonte_neige.f 2017/04/20 14:44:47 221 @@ -4,38 +4,27 @@ contains - SUBROUTINE fonte_neige(nisurf, dtime, tsurf, p1lay, beta, coef1lay, ps, & - precip_rain, precip_snow, snow, qsol, t1lay, q1lay, u1lay, v1lay, & - petAcoef, peqAcoef, petBcoef, peqBcoef, tsurf_new, evap, fqcalving, & - ffonte, run_off_lic_0) + SUBROUTINE fonte_neige(nisurf, dtime, precip_rain, precip_snow, snow, qsol, & + tsurf_new, evap, fqcalving, ffonte, run_off_lic_0) ! Routine de traitement de la fonte de la neige dans le cas du traitement ! de sol simplifi\'e - ! LF 03/2001 + ! Laurent Fairhead, March, 2001 - USE fcttre, ONLY: foeew, qsatl, qsats, thermcep USE indicesol, ONLY: epsfra, is_lic, is_sic, is_ter - USE interface_surf, ONLY: run_off, run_off_lic, tau_calv + USE interface_surf, ONLY: tau_calv use nr_util, only: assert_eq - USE suphec_m, ONLY: rcpd, rday, retv, rlmlt, rlstt, rlvtt, rtt - USE yoethf_m, ONLY: r2es, r5ies, r5les, rvtmp2 + USE suphec_m, ONLY: rday, rlmlt, rtt integer, intent(IN):: nisurf ! surface \`a traiter 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 real, intent(IN):: precip_rain(:) ! (knon) - ! precipitation, liquid water mass flux (kg/m2/s), positive down + ! precipitation, liquid water mass flux (kg / m2 / s), positive down real, intent(IN):: precip_snow(:) ! (knon) - ! precipitation, solid water mass flux (kg/m2/s), positive down + ! precipitation, solid water mass flux (kg / m2 / s), positive down real, intent(INOUT):: snow(:) ! (knon) ! column-density of mass of snow, in kg m-2 @@ -43,82 +32,43 @@ real, intent(INOUT):: qsol(:) ! (knon) ! column-density of water in soil, in kg m-2 - real, dimension(:), intent(IN):: t1lay ! (knon) - 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 - + real, intent(INOUT):: tsurf_new(:) ! (knon) temp\'erature au sol real, intent(IN):: evap(:) ! (knon) - ! Flux d'eau "perdue" par la surface et necessaire pour que limiter la - ! hauteur de neige, en kg/m2/s real, intent(OUT):: fqcalving(:) ! (knon) + ! flux d'eau "perdue" par la surface et n\'ecessaire pour limiter la + ! hauteur de neige, en kg / m2 / s - ! Flux thermique utiliser pour fondre la neige real, intent(OUT):: ffonte(:) ! (knon) + ! flux thermique utilis\'é pour fondre la neige - real, dimension(:), intent(INOUT):: run_off_lic_0 ! (knon) - ! run_off_lic_0 run off glacier du pas de temps pr\'ecedent + real, intent(INOUT):: run_off_lic_0(:) ! (knon) + ! run off glacier du pas de temps pr\'ecedent ! Local: integer knon ! nombre de points \`a traiter real, parameter:: snow_max=3000. - ! Masse maximum de neige (kg/m2). Au dessus de ce seuil, la neige - ! en exces "s'ecoule" (calving) + ! Masse maximum de neige (kg / m2). Au dessus de ce seuil, la neige + ! en exces "s'\'ecoule" (calving). integer i - logical zdelta - real zcvm5, zx_qs, zcor real fq_fonte - REAL bil_eau_s(size(ps)) ! in kg m-2 - real snow_evap(size(ps)) ! in kg m-2 s-1 - real, parameter:: t_coup = 273.15 - REAL, parameter:: chasno = 3.334E5/(2.3867E6*0.15) - REAL, parameter:: chaice = 3.334E5/(2.3867E6*0.15) + REAL bil_eau_s(size(precip_rain)) ! (knon) in kg m-2 + real snow_evap(size(precip_rain)) ! (knon) in kg m-2 s-1 + REAL, parameter:: chasno = 3.334E5 / (2.3867E6 * 0.15) + REAL, parameter:: chaice = 3.334E5 / (2.3867E6 * 0.15) real, parameter:: max_eau_sol = 150. ! in kg m-2 real coeff_rel + REAL, ALLOCATABLE, SAVE:: run_off_lic(:) ! ruissellement total !-------------------------------------------------------------------- - knon = assert_eq((/size(tsurf), size(p1lay), size(beta), size(coef1lay), & - size(ps), size(precip_rain), size(precip_snow), size(snow), & - size(qsol), size(t1lay), size(q1lay), size(u1lay), size(v1lay), & - 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 + knon = assert_eq((/size(precip_rain), size(precip_snow), size(snow), & + size(qsol), size(tsurf_new), size(evap), size(fqcalving), & + size(ffonte), size(run_off_lic_0)/), "fonte_neige knon") + coeff_rel = dtime / (tau_calv * rday) WHERE (precip_snow > 0.) snow = snow + precip_snow * dtime WHERE (evap > 0.) @@ -129,43 +79,48 @@ snow_evap = 0. end where - bil_eau_s = precip_rain * dtime - (evap(:knon) - snow_evap(:knon)) * dtime + bil_eau_s = (precip_rain - evap + snow_evap) * dtime - ! Y'a-t-il fonte de neige? + ! Y a-t-il fonte de neige ? - ffonte=0. do i = 1, knon if ((snow(i) > epsfra .OR. nisurf == is_sic & .OR. nisurf == is_lic) .AND. tsurf_new(i) >= RTT) then - fq_fonte = MIN(MAX((tsurf_new(i)-RTT)/chasno, 0.), snow(i)) - ffonte(i) = fq_fonte * RLMLT/dtime + fq_fonte = MIN(MAX((tsurf_new(i) - RTT) / chasno, 0.), snow(i)) + ffonte(i) = fq_fonte * RLMLT / dtime snow(i) = max(0., snow(i) - fq_fonte) bil_eau_s(i) = bil_eau_s(i) + fq_fonte tsurf_new(i) = tsurf_new(i) - fq_fonte * chasno - !IM cf JLD/ GKtest fonte aussi pour la glace + + !IM cf. JLD/ GKtest fonte aussi pour la glace IF (nisurf == is_sic .OR. nisurf == is_lic) THEN - fq_fonte = MAX((tsurf_new(i)-RTT)/chaice, 0.) - ffonte(i) = ffonte(i) + fq_fonte * RLMLT/dtime + fq_fonte = MAX((tsurf_new(i) - RTT) / chaice, 0.) + ffonte(i) = ffonte(i) + fq_fonte * RLMLT / dtime bil_eau_s(i) = bil_eau_s(i) + fq_fonte tsurf_new(i) = RTT ENDIF + else + ffonte(i) = 0. endif ! S'il y a une hauteur trop importante de neige, elle s'\'ecoule - fqcalving(i) = max(0., snow(i) - snow_max)/dtime - snow(i)=min(snow(i), snow_max) + fqcalving(i) = max(0., snow(i) - snow_max) / dtime + snow(i) = min(snow(i), snow_max) + enddo + + IF (nisurf == is_ter) then + qsol = MIN(qsol + bil_eau_s, max_eau_sol) + else if (nisurf == is_lic) then + if (.not. allocated(run_off_lic)) allocate(run_off_lic(knon)) + ! assumes that the fraction of land-ice does not change during the run - IF (nisurf == is_ter) then - 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 + do i = 1, knon run_off_lic(i) = (coeff_rel * fqcalving(i)) + & (1. - coeff_rel) * run_off_lic_0(i) run_off_lic_0(i) = run_off_lic(i) - run_off_lic(i) = run_off_lic(i) + bil_eau_s(i)/dtime - endif - enddo + run_off_lic(i) = run_off_lic(i) + bil_eau_s(i) / dtime + enddo + endif END SUBROUTINE fonte_neige