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surf_landice_mod.F90 @ 4835

Last change on this file since 4835 was 4835, checked in by evignon, 3 months ago
commission pour la suite du travail sur la mise a jour de la param de neige soufflee
Property copyright set to Name of program: LMDZ Creation date: 1984 Version: LMDZ5 License: CeCILL version 2 Holder: Laboratoire de m\'et\'eorologie dynamique, CNRS, UMR 8539 See the license file in the root directory Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 22.3 KB

Rev	Line
[781]	1	!
	2	MODULE surf_landice_mod
	3
	4	IMPLICIT NONE
	5
	6	CONTAINS
	7	!
	8	!****************************************************************************************
	9	!
	10	SUBROUTINE surf_landice(itime, dtime, knon, knindex, &
[1865]	11	rlon, rlat, debut, lafin, &
	12	rmu0, lwdownm, albedo, pphi1, &
[888]	13	swnet, lwnet, tsurf, p1lay, &
[4523]	14	cdragh, cdragm, precip_rain, precip_snow, precip_bs, temp_air, spechum, &
[1067]	15	AcoefH, AcoefQ, BcoefH, BcoefQ, &
	16	AcoefU, AcoefV, BcoefU, BcoefV, &
[4529]	17	AcoefQBS, BcoefQBS, &
[2240]	18	ps, u1, v1, gustiness, rugoro, pctsrf, &
[4523]	19	snow, qsurf, qsol, qbs1, agesno, &
	20	tsoil, z0m, z0h, SFRWL, alb_dir, alb_dif, evap, fluxsens, fluxlat, fluxbs, &
[1067]	21	tsurf_new, dflux_s, dflux_l, &
[3900]	22	alt, slope, cloudf, &
[1865]	23	snowhgt, qsnow, to_ice, sissnow, &
	24	alb3, runoff, &
[1067]	25	flux_u1, flux_v1)
[781]	26
[1067]	27	USE dimphy
[3974]	28	USE geometry_mod, ONLY : longitude,latitude
[3900]	29	USE surface_data, ONLY : type_ocean, calice, calsno, landice_opt, iflag_albcalc
	30	USE fonte_neige_mod, ONLY : fonte_neige,run_off_lic,fqcalving_global,ffonte_global,fqfonte_global,runofflic_global
[1067]	31	USE cpl_mod, ONLY : cpl_send_landice_fields
	32	USE calcul_fluxs_mod
[4835]	33	USE phys_local_var_mod, ONLY : zxrhoslic, zxustartlic, zxqsaltlic
[4414]	34	USE phys_output_var_mod, ONLY : snow_o,zfra_o
[2728]	35	!FC
	36	USE ioipsl_getin_p_mod, ONLY : getin_p
[4835]	37	USE lmdz_blowing_snow_ini, ONLY : c_esalt_bs, zeta_bs, pbst_bs, prt_bs, rhoice_bs, rhohard_bs
	38	USE lmdz_blowing_snow_ini, ONLY : rhofresh_bs, tau_eqsalt_bs, tau_dens0_bs, tau_densmin_bs
[3792]	39	#ifdef CPP_INLANDSIS
	40	USE surf_inlandsis_mod, ONLY : surf_inlandsis
	41	#endif
	42
[1785]	43	USE indice_sol_mod
[1067]	44
[1785]	45	! INCLUDE "indicesol.h"
[781]	46	INCLUDE "dimsoil.h"
[793]	47	INCLUDE "YOMCST.h"
	48	INCLUDE "clesphys.h"
[781]	49
	50	! Input variables
	51	!****************************************************************************************
	52	INTEGER, INTENT(IN) :: itime, knon
	53	INTEGER, DIMENSION(klon), INTENT(in) :: knindex
	54	REAL, INTENT(in) :: dtime
[888]	55	REAL, DIMENSION(klon), INTENT(IN) :: swnet ! net shortwave radiance
	56	REAL, DIMENSION(klon), INTENT(IN) :: lwnet ! net longwave radiance
[781]	57	REAL, DIMENSION(klon), INTENT(IN) :: tsurf
	58	REAL, DIMENSION(klon), INTENT(IN) :: p1lay
[1067]	59	REAL, DIMENSION(klon), INTENT(IN) :: cdragh, cdragm
[4523]	60	REAL, DIMENSION(klon), INTENT(IN) :: precip_rain, precip_snow, precip_bs
[781]	61	REAL, DIMENSION(klon), INTENT(IN) :: temp_air, spechum
[1067]	62	REAL, DIMENSION(klon), INTENT(IN) :: AcoefH, AcoefQ
	63	REAL, DIMENSION(klon), INTENT(IN) :: BcoefH, BcoefQ
	64	REAL, DIMENSION(klon), INTENT(IN) :: AcoefU, AcoefV, BcoefU, BcoefV
[4529]	65	REAL, DIMENSION(klon), INTENT(IN) :: AcoefQBS, BcoefQBS
[781]	66	REAL, DIMENSION(klon), INTENT(IN) :: ps
[4523]	67	REAL, DIMENSION(klon), INTENT(IN) :: u1, v1, gustiness, qbs1
[781]	68	REAL, DIMENSION(klon), INTENT(IN) :: rugoro
	69	REAL, DIMENSION(klon,nbsrf), INTENT(IN) :: pctsrf
	70
[1865]	71	LOGICAL, INTENT(IN) :: debut !true if first step
	72	LOGICAL, INTENT(IN) :: lafin !true if last step
	73	REAL, DIMENSION(klon), INTENT(IN) :: rlon, rlat
	74	REAL, DIMENSION(klon), INTENT(IN) :: rmu0
	75	REAL, DIMENSION(klon), INTENT(IN) :: lwdownm !ylwdown
	76	REAL, DIMENSION(klon), INTENT(IN) :: albedo !mean albedo
	77	REAL, DIMENSION(klon), INTENT(IN) :: pphi1
[3900]	78	REAL, DIMENSION(klon), INTENT(IN) :: alt !mean altitude of the grid box
[1865]	79	REAL, DIMENSION(klon), INTENT(IN) :: slope !mean slope in grid box
	80	REAL, DIMENSION(klon), INTENT(IN) :: cloudf !total cloud fraction
	81
[781]	82	! In/Output variables
	83	!****************************************************************************************
	84	REAL, DIMENSION(klon), INTENT(INOUT) :: snow, qsol
	85	REAL, DIMENSION(klon), INTENT(INOUT) :: agesno
	86	REAL, DIMENSION(klon, nsoilmx), INTENT(INOUT) :: tsoil
	87
	88	! Output variables
	89	!****************************************************************************************
	90	REAL, DIMENSION(klon), INTENT(OUT) :: qsurf
[2243]	91	REAL, DIMENSION(klon), INTENT(OUT) :: z0m, z0h
[2227]	92	!albedo SB >>>
	93	! REAL, DIMENSION(klon), INTENT(OUT) :: alb1 ! new albedo in visible SW interval
	94	! REAL, DIMENSION(klon), INTENT(OUT) :: alb2 ! new albedo in near IR interval
[3792]	95	REAL, DIMENSION(6), INTENT(IN) :: SFRWL
	96	REAL, DIMENSION(klon,nsw), INTENT(OUT) :: alb_dir,alb_dif
[2227]	97	!albedo SB <<<
[781]	98	REAL, DIMENSION(klon), INTENT(OUT) :: evap, fluxsens, fluxlat
[4523]	99	REAL, DIMENSION(klon), INTENT(OUT) :: fluxbs
[888]	100	REAL, DIMENSION(klon), INTENT(OUT) :: tsurf_new
[781]	101	REAL, DIMENSION(klon), INTENT(OUT) :: dflux_s, dflux_l
[1067]	102	REAL, DIMENSION(klon), INTENT(OUT) :: flux_u1, flux_v1
[781]	103
[1865]	104	REAL, DIMENSION(klon), INTENT(OUT) :: alb3
	105	REAL, DIMENSION(klon), INTENT(OUT) :: qsnow !column water in snow [kg/m2]
	106	REAL, DIMENSION(klon), INTENT(OUT) :: snowhgt !Snow height (m)
	107	REAL, DIMENSION(klon), INTENT(OUT) :: to_ice
	108	REAL, DIMENSION(klon), INTENT(OUT) :: sissnow
	109	REAL, DIMENSION(klon), INTENT(OUT) :: runoff !Land ice runoff
	110
	111
[781]	112	! Local variables
	113	!****************************************************************************************
	114	REAL, DIMENSION(klon) :: soilcap, soilflux
	115	REAL, DIMENSION(klon) :: cal, beta, dif_grnd
	116	REAL, DIMENSION(klon) :: zfra, alb_neig
[888]	117	REAL, DIMENSION(klon) :: radsol
[3792]	118	REAL, DIMENSION(klon) :: u0, v0, u1_lay, v1_lay, ustar
	119	INTEGER :: i,j,nt
[3900]	120	REAL, DIMENSION(klon) :: fqfonte,ffonte
[4283]	121	REAL, DIMENSION(klon) :: run_off_lic_frac
[1865]	122	REAL, DIMENSION(klon) :: emis_new !Emissivity
	123	REAL, DIMENSION(klon) :: swdown,lwdown
[3900]	124	REAL, DIMENSION(klon) :: precip_snow_adv, snow_adv !Snow Drift precip./advection (not used in inlandsis)
	125	REAL, DIMENSION(klon) :: erod !erosion of surface snow (flux, kg/m2/s like evap)
	126	REAL, DIMENSION(klon) :: zsl_height, wind_velo !surface layer height, wind spd
[1865]	127	REAL, DIMENSION(klon) :: dens_air, snow_cont_air !air density; snow content air
	128	REAL, DIMENSION(klon) :: alb_soil !albedo of underlying ice
	129	REAL, DIMENSION(klon) :: pexner !Exner potential
	130	REAL :: pref
[3792]	131	REAL, DIMENSION(klon,nsoilmx) :: tsoil0 !modif
	132	REAL :: dtis ! subtimestep
	133	LOGICAL :: debut_is, lafin_is ! debut and lafin for inlandsis
[1865]	134
	135	CHARACTER (len = 20) :: modname = 'surf_landice'
	136	CHARACTER (len = 80) :: abort_message
	137
[2728]	138
[3900]	139	REAL,DIMENSION(klon) :: alb1,alb2
[4523]	140	REAL,DIMENSION(klon) :: precip_totsnow, evap_totsnow
[3900]	141	REAL, DIMENSION (klon,6) :: alb6
[4835]	142	REAL :: esalt
[4529]	143	REAL :: lambdasalt,fluxsalt, csalt, nunu, aa, bb, cc
[4835]	144	REAL :: tau_dens, maxerosion, fluxbs_2
	145	REAL, DIMENSION(klon) :: ws1, rhod, rhos, ustart0, ustart, qsalt, hsalt
[4672]	146
[781]	147	! End definition
	148	!****************************************************************************************
[2728]	149	!FC
	150	!FC
	151	REAL,SAVE :: alb_vis_sno_lic
	152	!$OMP THREADPRIVATE(alb_vis_sno_lic)
	153	REAL,SAVE :: alb_nir_sno_lic
	154	!$OMP THREADPRIVATE(alb_nir_sno_lic)
	155	LOGICAL, SAVE :: firstcall = .TRUE.
	156	!$OMP THREADPRIVATE(firstcall)
	157
	158
[3792]	159	!FC firtscall initializations
	160	!******************************************************************************************
[2728]	161	IF (firstcall) THEN
	162	alb_vis_sno_lic=0.77
	163	CALL getin_p('alb_vis_sno_lic',alb_vis_sno_lic)
	164	PRINT*, 'alb_vis_sno_lic',alb_vis_sno_lic
	165	alb_nir_sno_lic=0.77
	166	CALL getin_p('alb_nir_sno_lic',alb_nir_sno_lic)
	167	PRINT*, 'alb_nir_sno_lic',alb_nir_sno_lic
[3792]	168
[2728]	169	firstcall=.false.
	170	ENDIF
[3792]	171	!******************************************************************************************
	172
[781]	173	! Initialize output variables
[1865]	174	alb3(:) = 999999.
[888]	175	alb2(:) = 999999.
	176	alb1(:) = 999999.
[4523]	177	fluxbs(:)=0.
[1865]	178	runoff(:) = 0.
[888]	179	!****************************************************************************************
	180	! Calculate total absorbed radiance at surface
	181	!
	182	!****************************************************************************************
	183	radsol(:) = 0.0
	184	radsol(1:knon) = swnet(1:knon) + lwnet(1:knon)
[781]	185
	186	!****************************************************************************************
[4523]	187
	188	!****************************************************************************************
[3792]	189	! landice_opt = 0 : soil_model, calcul_flux, fonte_neige, ...
[3901]	190	! landice_opt = 1 : prepare and call INterace Lmdz SISvat (INLANDSIS)
[1865]	191	!****************************************************************************************
[3792]	192
	193
	194	IF (landice_opt .EQ. 1) THEN
	195
[3901]	196	!****************************************************************************************
[3792]	197	! CALL to INLANDSIS interface
	198	!****************************************************************************************
	199	#ifdef CPP_INLANDSIS
	200
	201	debut_is=debut
	202	lafin_is=.false.
	203	! Suppose zero surface speed
	204	u0(:) = 0.0
	205	v0(:) = 0.0
	206
	207
	208	CALL calcul_flux_wind(knon, dtime, &
	209	u0, v0, u1, v1, gustiness, cdragm, &
	210	AcoefU, AcoefV, BcoefU, BcoefV, &
	211	p1lay, temp_air, &
	212	flux_u1, flux_v1)
	213
	214
	215	! Set constants and compute some input for SISVAT
	216	! = 1000 hPa
	217	! and calculate incoming flux for SW and LW interval: swdown, lwdown
	218	swdown(:) = 0.0
	219	lwdown(:) = 0.0
[3900]	220	snow_cont_air(:) = 0. ! the snow content in air is not a prognostic variable of the model
[3792]	221	alb_soil(:) = 0.4 ! before albedo(:) but here it is the ice albedo that we have to set
	222	ustar(:) = 0.
	223	pref = 100000.
	224	DO i = 1, knon
	225	swdown(i) = swnet(i)/(1-albedo(i))
	226	lwdown(i) = lwdownm(i)
	227	wind_velo(i) = u1(i)2 + v1(i)2
	228	wind_velo(i) = wind_velo(i)**0.5
	229	pexner(i) = (p1lay(i)/pref)**(RD/RCPD)
	230	dens_air(i) = p1lay(i)/RD/temp_air(i) ! dry air density
	231	zsl_height(i) = pphi1(i)/RG
	232	tsoil0(i,:) = tsoil(i,:)
	233	ustar(i)= (cdragm(i)(wind_velo(i)2))*0.5
	234	END DO
	235
	236
	237
[3900]	238	dtis=dtime
[3792]	239
[3900]	240	IF (lafin) THEN
[3792]	241	lafin_is=.true.
	242	END IF
	243
[3900]	244	CALL surf_inlandsis(knon, rlon, rlat, knindex, itime, dtis, debut_is, lafin_is,&
	245	rmu0, swdown, lwdown, albedo, pexner, ps, p1lay, precip_rain, precip_snow, &
	246	zsl_height, wind_velo, ustar, temp_air, dens_air, spechum, tsurf,&
	247	rugoro, snow_cont_air, alb_soil, alt, slope, cloudf, &
	248	radsol, qsol, tsoil0, snow, zfra, snowhgt, qsnow, to_ice, sissnow,agesno, &
[3792]	249	AcoefH, AcoefQ, BcoefH, BcoefQ, cdragm, cdragh, &
[3900]	250	run_off_lic, fqfonte, ffonte, evap, erod, fluxsens, fluxlat,dflux_s, dflux_l, &
	251	tsurf_new, alb1, alb2, alb3, alb6, &
	252	emis_new, z0m, z0h, qsurf)
[3792]	253
[3900]	254	debut_is=.false.
[3792]	255
	256
[3900]	257	! Treatment of snow melting and calving
[3792]	258
[3900]	259	! for consistency with standard LMDZ, add calving to run_off_lic
	260	run_off_lic(:)=run_off_lic(:) + to_ice(:)
	261
	262	DO i = 1, knon
	263	ffonte_global(knindex(i),is_lic) = ffonte(i)
	264	fqfonte_global(knindex(i),is_lic) = fqfonte(i)! net melting= melting - refreezing
	265	fqcalving_global(knindex(i),is_lic) = to_ice(i) ! flux
	266	runofflic_global(knindex(i)) = run_off_lic(i)
	267	ENDDO
	268	! Here, we assume that the calving term is equal to the to_ice term
	269	! (no ice accumulation)
	270
	271
[3792]	272	#else
[3901]	273	abort_message='Pb de coherence: landice_opt = 1 mais CPP_INLANDSIS = .false.'
[3792]	274	CALL abort_physic(modname,abort_message,1)
	275	#endif
	276
	277
	278	ELSE
	279
	280	!****************************************************************************************
[781]	281	! Soil calculations
	282	!
	283	!****************************************************************************************
[3780]	284
	285	! EV: use calbeta
	286	CALL calbeta(dtime, is_lic, knon, snow, qsol, beta, cal, dif_grnd)
	287
	288
	289	! use soil model and recalculate properly cal
[781]	290	IF (soil_model) THEN
[3974]	291	CALL soil(dtime, is_lic, knon, snow, tsurf, qsol, &
	292	& longitude(knindex(1:knon)), latitude(knindex(1:knon)), tsoil, soilcap, soilflux)
[781]	293	cal(1:knon) = RCPD / soilcap(1:knon)
	294	radsol(1:knon) = radsol(1:knon) + soilflux(1:knon)
	295	ELSE
	296	cal = RCPD * calice
	297	WHERE (snow > 0.0) cal = RCPD * calsno
	298	ENDIF
	299
	300
	301	!****************************************************************************************
	302	! Calulate fluxes
	303	!
	304	!****************************************************************************************
[3792]	305	! beta(:) = 1.0
	306	! dif_grnd(:) = 0.0
[781]	307
[1067]	308	! Suppose zero surface speed
	309	u0(:)=0.0
	310	v0(:)=0.0
	311	u1_lay(:) = u1(:) - u0(:)
	312	v1_lay(:) = v1(:) - v0(:)
	313
[781]	314	CALL calcul_fluxs(knon, is_lic, dtime, &
[2254]	315	tsurf, p1lay, cal, beta, cdragh, cdragh, ps, &
[781]	316	precip_rain, precip_snow, snow, qsurf, &
[2240]	317	radsol, dif_grnd, temp_air, spechum, u1_lay, v1_lay, gustiness, &
[2254]	318	1.,AcoefH, AcoefQ, BcoefH, BcoefQ, &
[781]	319	tsurf_new, evap, fluxlat, fluxsens, dflux_s, dflux_l)
	320
[1067]	321	CALL calcul_flux_wind(knon, dtime, &
[2240]	322	u0, v0, u1, v1, gustiness, cdragm, &
[1067]	323	AcoefU, AcoefV, BcoefU, BcoefV, &
	324	p1lay, temp_air, &
	325	flux_u1, flux_v1)
[781]	326
	327
	328	!****************************************************************************************
	329	! Calculate albedo
	330	!
	331	!****************************************************************************************
[3780]	332
[781]	333	!
	334	!IM: plusieurs choix/tests sur l'albedo des "glaciers continentaux"
[888]	335	! alb1(1 : knon) = 0.6 !IM cf FH/GK
	336	! alb1(1 : knon) = 0.82
	337	! alb1(1 : knon) = 0.77 !211003 Ksta0.77
	338	! alb1(1 : knon) = 0.8 !KstaTER0.8 & LMD_ARMIP5
[781]	339	!IM: KstaTER0.77 & LMD_ARMIP6
	340
[3780]	341	! Attantion: alb1 and alb2 are not the same!
[2728]	342	alb1(1:knon) = alb_vis_sno_lic
	343	alb2(1:knon) = alb_nir_sno_lic
[781]	344
	345
	346	!****************************************************************************************
	347	! Rugosity
	348	!
	349	!****************************************************************************************
[4245]	350	z0m = z0m_landice
	351	z0h = z0h_landice
	352	!z0m = SQRT(z0m2+rugoro2)
[2243]	353
[781]	354
[4835]	355	!****************************************************************************************
	356	! Simple blowing snow param
	357	!****************************************************************************************
	358	! we proceed in 2 steps:
	359	! first we erode - if possible -the accumulated snow during the time step
	360	! then we update the density of the underlying layer and see if we can also erode
	361	! this layer
[1865]	362
[4529]	363
[4835]	364	if (ok_bs) then
	365	fluxbs(:)=0.
	366	do j=1,klon
	367	ws1(j)=(u1(j)2+v1(j)2)**0.5
	368	ustar(j)=(cdragm(j)(u1(j)2+v1(j)2))*0.5
	369	rhod(j)=p1lay(j)/RD/temp_air(j)
	370	ustart0(j) =(log(2.868)-log(1.625))/0.085*sqrt(cdragm(j))
	371	enddo
	372
	373	! 1st step: erosion of fresh snow accumulated during the time step
	374	do j=1, knon
	375
	376	rhos(j)=rhofresh_bs
	377	! blowing snow flux formula used in MAR
	378	ustart(j)=ustart0(j)exp(max(rhoice_bs/rhofresh_bs-rhoice_bs/rhos(j),0.))exp(max(0.,rhos(j)-rhohard_bs))
	379	! we have multiplied by exp to prevent erosion when rhos>rhohard_bs
	380	! computation of qbs at the top of the saltation layer
	381	! default formulation from MAR model (Amory et al. 2021, Gallee et al. 2001)
	382	esalt=1./(c_esalt_bs*max(1.e-6,ustar(j)))
	383	hsalt(j)=0.08436(max(1.e-6,ustar(j))*1.27)
	384	qsalt(j)=(max(ustar(j)2-ustart(j)2,0.))/(RGhsalt(j))esalt
	385	! calculation of erosion (flux positive towards the surface here)
	386	! consistent with implicit resolution of turbulent mixing equation
	387	! Nemoto and Nishimura 2004 show that steady-state saltation is achieved within a time tau_eqsalt_bs of about 10s
	388	! we thus prevent snowerosion (snow particle transfer from the saltation layer to the first model level)
	389	! integrated over tau_eqsalt_bs to exceed the total mass of snow particle in the saltation layer
	390	! (rhoqsalthsalt)
	391	! during this first step we also lower bound the erosion to the amount of fresh snow accumulated during the time step
	392	maxerosion=min(precip_snow(j),hsalt(j)qsalt(j)rhod(j)/tau_eqsalt_bs)
	393
	394	fluxbs(j)=rhod(j)ws1(j)cdragm(j)*(AcoefQBS(j)-qsalt(j)) &
	395	/ (1.-rhod(j)ws1(j)cdragm(j)BcoefQBS(j)dtime)
	396	!fluxbs(j)= rhodws1(j)cdragm(j)*(qbs1(j)-qsalt(j))
	397	fluxbs(j)=max(-maxerosion,fluxbs(j))
	398	enddo
	399
	400
	401	! we now compute the snow age of the overlying layer (snow surface after erosion of the fresh snow accumulated during the time step)
	402	! this is done through the routine albsno
	403	CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:)+fluxbs(:))
	404
	405	! 2nd step:
[4529]	406	! computation of threshold friction velocity
	407	! which depends on surface snow density
[4672]	408	do j = 1, knon
[4523]	409	! estimation of snow density
	410	! snow density increases with snow age and
[4672]	411	! increases even faster in case of sedimentation of blowing snow or rain
[4835]	412	tau_dens=max(tau_densmin_bs, tau_dens0_bs*exp(-abs(precip_bs(j))/pbst_bs - &
	413	abs(precip_rain(j))/prt_bs)*exp(-max(tsurf(j)-RTT,0.)))
	414	rhos(j)=rhofresh_bs+(rhohard_bs-rhofresh_bs)(1.-exp(-agesno(j)86400.0/tau_dens))
[4523]	415	! blowing snow flux formula used in MAR
[4835]	416	ustart(j)=ustart0(j)exp(max(rhoice_bs/rhofresh_bs-rhoice_bs/rhos(j),0.))exp(max(0.,rhos(j)-rhohard_bs))
	417	! we have multiplied by exp to prevent erosion when rhos>rhohard_bs
	418	! computation of qbs at the top of the saltation layer
	419	! default formulation from MAR model (Amory et al. 2021, Gallee et al. 2001)
	420	esalt=c_esalt_bs*ustar(j)
	421	hsalt(j)=0.08436(max(1.e-6,ustar(j))*1.27)
	422	qsalt(j)=(max(ustar(j)2-ustart(j)2,0.))/(RGhsalt(j))esalt
	423	! calculation of erosion (flux positive towards the surface here)
	424	! consistent with implicit resolution of turbulent mixing equation
	425	! Nemoto and Nishimura 2004 show that steady-state saltation is achieved within a time tau_eqsalt_bs of about 10s
	426	! we thus prevent snowerosion (snow particle transfer from the saltation layer to the first model level)
	427	! integrated over tau_eqsalt_bs to exceed the total mass of snow particle in the saltation layer
	428	! (rhoqsalthsalt)
	429	maxerosion=hsalt(j)qsalt(j)rhod(j)/tau_eqsalt_bs
	430	fluxbs_2=rhod(j)ws1(j)cdragm(j)*(AcoefQBS(j)-qsalt(j)) &
	431	/ (1.-rhod(j)ws1(j)cdragm(j)BcoefQBS(j)dtime)
	432	!fluxbs_2= rhodws1(j)cdragm(j)*(qbs1(j)-qsalt(j))
	433	fluxbs_2=max(-maxerosion,fluxbs_2)
	434	fluxbs(j)=fluxbs(j)+fluxbs_2
[4523]	435	enddo
	436
[4835]	437	! for outputs
	438	do j=1, knon
[4672]	439	i = knindex(j)
	440	zxustartlic(i) = ustart(j)
	441	zxrhoslic(i) = rhos(j)
[4835]	442	zxqsaltlic(i)=qsalt(j)
	443	enddo
[4523]	444
	445
[4835]	446	else
	447	! those lines are useful to calculate the snow age
	448	CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:))
[4523]	449
[4835]	450	endif ! if ok_bs
[4523]	451
[4835]	452
	453
[4523]	454	!****************************************************************************************
[4672]	455	! Calculate snow amount
[4523]	456	!
	457	!****************************************************************************************
	458	IF (ok_bs) THEN
[4526]	459	precip_totsnow(:)=precip_snow(:)+precip_bs(:)
	460	evap_totsnow(:)=evap(:)-fluxbs(:) ! flux bs is positive towards the surface (snow erosion)
[4523]	461	ELSE
[4526]	462	precip_totsnow(:)=precip_snow(:)
	463	evap_totsnow(:)=evap(:)
[4523]	464	ENDIF
[4672]	465
	466
[4523]	467	CALL fonte_neige(knon, is_lic, knindex, dtime, &
	468	tsurf, precip_rain, precip_totsnow, &
	469	snow, qsol, tsurf_new, evap_totsnow)
[4672]	470
	471
[4523]	472	WHERE (snow(1 : knon) .LT. 0.0001) agesno(1 : knon) = 0.
	473	zfra(1:knon) = MAX(0.0,MIN(1.0,snow(1:knon)/(snow(1:knon)+10.0)))
	474
	475
[3792]	476	END IF ! landice_opt
	477
	478
[781]	479	!****************************************************************************************
	480	! Send run-off on land-ice to coupler if coupled ocean.
[3903]	481	! run_off_lic has been calculated in fonte_neige or surf_inlandsis
[4283]	482	! If landice_opt>=2, corresponding call is done from surf_land_orchidee
[781]	483	!****************************************************************************************
[4283]	484	IF (type_ocean=='couple' .AND. landice_opt .LT. 2) THEN
	485	! Compress fraction where run_off_lic is active (here all pctsrf(is_lic))
	486	run_off_lic_frac(:)=0.0
	487	DO j = 1, knon
	488	i = knindex(j)
	489	run_off_lic_frac(j) = pctsrf(i,is_lic)
	490	ENDDO
	491
	492	CALL cpl_send_landice_fields(itime, knon, knindex, run_off_lic, run_off_lic_frac)
[781]	493	ENDIF
[1865]	494
	495	! transfer runoff rate [kg/m2/s](!) to physiq for output
	496	runoff(1:knon)=run_off_lic(1:knon)/dtime
	497
[1403]	498	snow_o=0.
	499	zfra_o = 0.
	500	DO j = 1, knon
	501	i = knindex(j)
	502	snow_o(i) = snow(j)
	503	zfra_o(i) = zfra(j)
	504	ENDDO
	505
	506
[2227]	507	!albedo SB >>>
	508	select case(NSW)
	509	case(2)
	510	alb_dir(1:knon,1)=alb1(1:knon)
	511	alb_dir(1:knon,2)=alb2(1:knon)
	512	case(4)
	513	alb_dir(1:knon,1)=alb1(1:knon)
	514	alb_dir(1:knon,2)=alb2(1:knon)
	515	alb_dir(1:knon,3)=alb2(1:knon)
	516	alb_dir(1:knon,4)=alb2(1:knon)
	517	case(6)
	518	alb_dir(1:knon,1)=alb1(1:knon)
	519	alb_dir(1:knon,2)=alb1(1:knon)
	520	alb_dir(1:knon,3)=alb1(1:knon)
	521	alb_dir(1:knon,4)=alb2(1:knon)
	522	alb_dir(1:knon,5)=alb2(1:knon)
	523	alb_dir(1:knon,6)=alb2(1:knon)
[3900]	524
[3901]	525	IF ((landice_opt .EQ. 1) .AND. (iflag_albcalc .EQ. 2)) THEN
[3900]	526	alb_dir(1:knon,1)=alb6(1:knon,1)
	527	alb_dir(1:knon,2)=alb6(1:knon,2)
	528	alb_dir(1:knon,3)=alb6(1:knon,3)
	529	alb_dir(1:knon,4)=alb6(1:knon,4)
	530	alb_dir(1:knon,5)=alb6(1:knon,5)
	531	alb_dir(1:knon,6)=alb6(1:knon,6)
	532	ENDIF
	533
[2227]	534	end select
	535	alb_dif=alb_dir
	536	!albedo SB <<<
	537
	538
[781]	539	END SUBROUTINE surf_landice
	540	!
	541	!****************************************************************************************
	542	!
	543	END MODULE surf_landice_mod
	544
	545
	546

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