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surf_landice_mod.F90 @ 5212

Last change on this file since 5212 was 5203, checked in by Laurent Fairhead, 8 weeks ago
Merge with trunk revision 5202 before reintegration to trunk
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: 28.2 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, &
[5202]	25	flux_u1, flux_v1 &
	26	#ifdef ISO
	27	& ,xtprecip_rain, xtprecip_snow,xtspechum,Rland_ice &
	28	& ,xtsnow,xtsol,xtevap &
	29	#endif
	30	& )
[781]	31
[1067]	32	USE dimphy
[3974]	33	USE geometry_mod, ONLY : longitude,latitude
[3900]	34	USE surface_data, ONLY : type_ocean, calice, calsno, landice_opt, iflag_albcalc
	35	USE fonte_neige_mod, ONLY : fonte_neige,run_off_lic,fqcalving_global,ffonte_global,fqfonte_global,runofflic_global
[1067]	36	USE cpl_mod, ONLY : cpl_send_landice_fields
	37	USE calcul_fluxs_mod
[5203]	38	USE phys_local_var_mod, ONLY : zxrhoslic, zxustartlic, zxqsaltlic, tempsmoothlic
[4414]	39	USE phys_output_var_mod, ONLY : snow_o,zfra_o
[5202]	40	#ifdef ISO
	41	USE fonte_neige_mod, ONLY : xtrun_off_lic
	42	USE infotrac_phy, ONLY : ntiso,niso
	43	USE isotopes_routines_mod, ONLY: calcul_iso_surf_lic_vectall
	44	#ifdef ISOVERIF
	45	USE isotopes_mod, ONLY: iso_eau,ridicule
	46	USE isotopes_verif_mod
	47	#endif
	48	#endif
	49
[2728]	50	!FC
	51	USE ioipsl_getin_p_mod, ONLY : getin_p
[4835]	52	USE lmdz_blowing_snow_ini, ONLY : c_esalt_bs, zeta_bs, pbst_bs, prt_bs, rhoice_bs, rhohard_bs
	53	USE lmdz_blowing_snow_ini, ONLY : rhofresh_bs, tau_eqsalt_bs, tau_dens0_bs, tau_densmin_bs
[3792]	54	#ifdef CPP_INLANDSIS
	55	USE surf_inlandsis_mod, ONLY : surf_inlandsis
	56	#endif
	57
[1785]	58	USE indice_sol_mod
[1067]	59
[1785]	60	! INCLUDE "indicesol.h"
[781]	61	INCLUDE "dimsoil.h"
[793]	62	INCLUDE "YOMCST.h"
	63	INCLUDE "clesphys.h"
[781]	64
	65	! Input variables
	66	!****************************************************************************************
	67	INTEGER, INTENT(IN) :: itime, knon
	68	INTEGER, DIMENSION(klon), INTENT(in) :: knindex
	69	REAL, INTENT(in) :: dtime
[888]	70	REAL, DIMENSION(klon), INTENT(IN) :: swnet ! net shortwave radiance
	71	REAL, DIMENSION(klon), INTENT(IN) :: lwnet ! net longwave radiance
[781]	72	REAL, DIMENSION(klon), INTENT(IN) :: tsurf
	73	REAL, DIMENSION(klon), INTENT(IN) :: p1lay
[1067]	74	REAL, DIMENSION(klon), INTENT(IN) :: cdragh, cdragm
[4523]	75	REAL, DIMENSION(klon), INTENT(IN) :: precip_rain, precip_snow, precip_bs
[781]	76	REAL, DIMENSION(klon), INTENT(IN) :: temp_air, spechum
[1067]	77	REAL, DIMENSION(klon), INTENT(IN) :: AcoefH, AcoefQ
	78	REAL, DIMENSION(klon), INTENT(IN) :: BcoefH, BcoefQ
	79	REAL, DIMENSION(klon), INTENT(IN) :: AcoefU, AcoefV, BcoefU, BcoefV
[4529]	80	REAL, DIMENSION(klon), INTENT(IN) :: AcoefQBS, BcoefQBS
[781]	81	REAL, DIMENSION(klon), INTENT(IN) :: ps
[4523]	82	REAL, DIMENSION(klon), INTENT(IN) :: u1, v1, gustiness, qbs1
[781]	83	REAL, DIMENSION(klon), INTENT(IN) :: rugoro
	84	REAL, DIMENSION(klon,nbsrf), INTENT(IN) :: pctsrf
[5202]	85	#ifdef ISO
	86	REAL, DIMENSION(ntiso,klon), INTENT(IN) :: xtprecip_rain, xtprecip_snow
	87	REAL, DIMENSION(ntiso,klon), INTENT(IN) :: xtspechum
	88	#endif
[781]	89
[5202]	90
[1865]	91	LOGICAL, INTENT(IN) :: debut !true if first step
	92	LOGICAL, INTENT(IN) :: lafin !true if last step
	93	REAL, DIMENSION(klon), INTENT(IN) :: rlon, rlat
	94	REAL, DIMENSION(klon), INTENT(IN) :: rmu0
	95	REAL, DIMENSION(klon), INTENT(IN) :: lwdownm !ylwdown
	96	REAL, DIMENSION(klon), INTENT(IN) :: albedo !mean albedo
	97	REAL, DIMENSION(klon), INTENT(IN) :: pphi1
[3900]	98	REAL, DIMENSION(klon), INTENT(IN) :: alt !mean altitude of the grid box
[1865]	99	REAL, DIMENSION(klon), INTENT(IN) :: slope !mean slope in grid box
	100	REAL, DIMENSION(klon), INTENT(IN) :: cloudf !total cloud fraction
	101
[781]	102	! In/Output variables
	103	!****************************************************************************************
	104	REAL, DIMENSION(klon), INTENT(INOUT) :: snow, qsol
	105	REAL, DIMENSION(klon), INTENT(INOUT) :: agesno
	106	REAL, DIMENSION(klon, nsoilmx), INTENT(INOUT) :: tsoil
[5202]	107	#ifdef ISO
	108	REAL, DIMENSION(niso,klon), INTENT(INOUT) :: xtsnow, xtsol
	109	REAL, DIMENSION(niso,klon), INTENT(INOUT) :: Rland_ice
	110	#endif
[781]	111
[5202]	112
[781]	113	! Output variables
	114	!****************************************************************************************
	115	REAL, DIMENSION(klon), INTENT(OUT) :: qsurf
[2243]	116	REAL, DIMENSION(klon), INTENT(OUT) :: z0m, z0h
[2227]	117	!albedo SB >>>
	118	! REAL, DIMENSION(klon), INTENT(OUT) :: alb1 ! new albedo in visible SW interval
	119	! REAL, DIMENSION(klon), INTENT(OUT) :: alb2 ! new albedo in near IR interval
[3792]	120	REAL, DIMENSION(6), INTENT(IN) :: SFRWL
	121	REAL, DIMENSION(klon,nsw), INTENT(OUT) :: alb_dir,alb_dif
[2227]	122	!albedo SB <<<
[781]	123	REAL, DIMENSION(klon), INTENT(OUT) :: evap, fluxsens, fluxlat
[4523]	124	REAL, DIMENSION(klon), INTENT(OUT) :: fluxbs
[888]	125	REAL, DIMENSION(klon), INTENT(OUT) :: tsurf_new
[781]	126	REAL, DIMENSION(klon), INTENT(OUT) :: dflux_s, dflux_l
[1067]	127	REAL, DIMENSION(klon), INTENT(OUT) :: flux_u1, flux_v1
[781]	128
[1865]	129	REAL, DIMENSION(klon), INTENT(OUT) :: alb3
	130	REAL, DIMENSION(klon), INTENT(OUT) :: qsnow !column water in snow [kg/m2]
	131	REAL, DIMENSION(klon), INTENT(OUT) :: snowhgt !Snow height (m)
	132	REAL, DIMENSION(klon), INTENT(OUT) :: to_ice
	133	REAL, DIMENSION(klon), INTENT(OUT) :: sissnow
	134	REAL, DIMENSION(klon), INTENT(OUT) :: runoff !Land ice runoff
[5202]	135	#ifdef ISO
	136	REAL, DIMENSION(ntiso,klon), INTENT(OUT) :: xtevap
	137	! real, DIMENSION(niso,klon) :: xtrun_off_lic_0_diag ! est une variable globale de
	138	! fonte_neige
	139	#endif
[1865]	140
	141
[781]	142	! Local variables
	143	!****************************************************************************************
	144	REAL, DIMENSION(klon) :: soilcap, soilflux
	145	REAL, DIMENSION(klon) :: cal, beta, dif_grnd
	146	REAL, DIMENSION(klon) :: zfra, alb_neig
[888]	147	REAL, DIMENSION(klon) :: radsol
[3792]	148	REAL, DIMENSION(klon) :: u0, v0, u1_lay, v1_lay, ustar
	149	INTEGER :: i,j,nt
[3900]	150	REAL, DIMENSION(klon) :: fqfonte,ffonte
[4283]	151	REAL, DIMENSION(klon) :: run_off_lic_frac
[5202]	152	#ifdef ISO
	153	REAL, PARAMETER :: t_coup = 273.15
	154	REAL, DIMENSION(klon) :: fqfonte_diag
	155	REAL, DIMENSION(klon) :: fq_fonte_diag
	156	REAL, DIMENSION(klon) :: snow_evap_diag
	157	REAL, DIMENSION(klon) :: fqcalving_diag
	158	REAL max_eau_sol_diag
	159	REAL, DIMENSION(klon) :: runoff_diag
	160	REAL, DIMENSION(klon) :: run_off_lic_diag
	161	REAL :: coeff_rel_diag
	162	INTEGER :: ixt
	163	REAL, DIMENSION(niso,klon) :: xtsnow_prec,xtsol_prec
	164	REAL, DIMENSION(klon) :: snow_prec,qsol_prec
	165	! real, DIMENSION(klon) :: run_off_lic_0_diag
	166	#endif
	167
	168
[1865]	169	REAL, DIMENSION(klon) :: emis_new !Emissivity
	170	REAL, DIMENSION(klon) :: swdown,lwdown
[3900]	171	REAL, DIMENSION(klon) :: precip_snow_adv, snow_adv !Snow Drift precip./advection (not used in inlandsis)
	172	REAL, DIMENSION(klon) :: erod !erosion of surface snow (flux, kg/m2/s like evap)
	173	REAL, DIMENSION(klon) :: zsl_height, wind_velo !surface layer height, wind spd
[1865]	174	REAL, DIMENSION(klon) :: dens_air, snow_cont_air !air density; snow content air
	175	REAL, DIMENSION(klon) :: alb_soil !albedo of underlying ice
	176	REAL, DIMENSION(klon) :: pexner !Exner potential
	177	REAL :: pref
[3792]	178	REAL, DIMENSION(klon,nsoilmx) :: tsoil0 !modif
	179	REAL :: dtis ! subtimestep
	180	LOGICAL :: debut_is, lafin_is ! debut and lafin for inlandsis
[1865]	181
	182	CHARACTER (len = 20) :: modname = 'surf_landice'
	183	CHARACTER (len = 80) :: abort_message
	184
[2728]	185
[3900]	186	REAL,DIMENSION(klon) :: alb1,alb2
[5203]	187	REAL :: time_tempsmooth,coef_tempsmooth
[4523]	188	REAL,DIMENSION(klon) :: precip_totsnow, evap_totsnow
[3900]	189	REAL, DIMENSION (klon,6) :: alb6
[4835]	190	REAL :: esalt
[4529]	191	REAL :: lambdasalt,fluxsalt, csalt, nunu, aa, bb, cc
[4916]	192	REAL :: tau_dens, maxerosion
[4835]	193	REAL, DIMENSION(klon) :: ws1, rhod, rhos, ustart0, ustart, qsalt, hsalt
[4916]	194	REAL, DIMENSION(klon) :: fluxbs_1, fluxbs_2, bsweight_fresh
	195	LOGICAL, DIMENSION(klon) :: ok_remaining_freshsnow
[5202]	196	REAL :: ta1, ta2, ta3, z01, z02, z03, coefa, coefb, coefc, coefd
[4672]	197
[5202]	198
[781]	199	! End definition
	200	!****************************************************************************************
[2728]	201	!FC
	202	!FC
	203	REAL,SAVE :: alb_vis_sno_lic
	204	!$OMP THREADPRIVATE(alb_vis_sno_lic)
	205	REAL,SAVE :: alb_nir_sno_lic
	206	!$OMP THREADPRIVATE(alb_nir_sno_lic)
	207	LOGICAL, SAVE :: firstcall = .TRUE.
	208	!$OMP THREADPRIVATE(firstcall)
	209
	210
[3792]	211	!FC firtscall initializations
	212	!******************************************************************************************
[5202]	213	#ifdef ISO
	214	#ifdef ISOVERIF
	215	! write(,) 'surf_land_ice 1499'
	216	DO i=1,knon
	217	IF (iso_eau > 0) THEN
	218	CALL iso_verif_egalite_choix(xtsnow(iso_eau,i),snow(i), &
	219	& 'surf_land_ice 126',errmax,errmaxrel)
	220	ENDIF !IF (iso_eau > 0) THEN
	221	ENDDO !DO i=1,knon
	222	#endif
	223	#endif
	224
[2728]	225	IF (firstcall) THEN
	226	alb_vis_sno_lic=0.77
	227	CALL getin_p('alb_vis_sno_lic',alb_vis_sno_lic)
	228	PRINT*, 'alb_vis_sno_lic',alb_vis_sno_lic
	229	alb_nir_sno_lic=0.77
	230	CALL getin_p('alb_nir_sno_lic',alb_nir_sno_lic)
	231	PRINT*, 'alb_nir_sno_lic',alb_nir_sno_lic
[3792]	232
[5203]	233	DO j=1,knon
	234	i = knindex(j)
	235	tempsmoothlic(i) = temp_air(j)
	236	ENDDO
[2728]	237	firstcall=.false.
	238	ENDIF
[3792]	239	!******************************************************************************************
	240
[781]	241	! Initialize output variables
[1865]	242	alb3(:) = 999999.
[888]	243	alb2(:) = 999999.
	244	alb1(:) = 999999.
[4523]	245	fluxbs(:)=0.
[1865]	246	runoff(:) = 0.
[888]	247	!****************************************************************************************
	248	! Calculate total absorbed radiance at surface
	249	!
	250	!****************************************************************************************
	251	radsol(:) = 0.0
	252	radsol(1:knon) = swnet(1:knon) + lwnet(1:knon)
[781]	253
	254	!****************************************************************************************
[4523]	255
	256	!****************************************************************************************
[3792]	257	! landice_opt = 0 : soil_model, calcul_flux, fonte_neige, ...
[3901]	258	! landice_opt = 1 : prepare and call INterace Lmdz SISvat (INLANDSIS)
[1865]	259	!****************************************************************************************
[3792]	260
	261
	262	IF (landice_opt .EQ. 1) THEN
	263
[3901]	264	!****************************************************************************************
[3792]	265	! CALL to INLANDSIS interface
	266	!****************************************************************************************
	267	#ifdef CPP_INLANDSIS
	268
[5202]	269	#ifdef ISO
	270	CALL abort_gcm('surf_landice 235','isotopes pas dans INLANDSIS',1)
	271	#endif
	272
[3792]	273	debut_is=debut
	274	lafin_is=.false.
	275	! Suppose zero surface speed
	276	u0(:) = 0.0
	277	v0(:) = 0.0
	278
	279
	280	CALL calcul_flux_wind(knon, dtime, &
	281	u0, v0, u1, v1, gustiness, cdragm, &
	282	AcoefU, AcoefV, BcoefU, BcoefV, &
	283	p1lay, temp_air, &
	284	flux_u1, flux_v1)
	285
	286
	287	! Set constants and compute some input for SISVAT
	288	! = 1000 hPa
	289	! and calculate incoming flux for SW and LW interval: swdown, lwdown
	290	swdown(:) = 0.0
	291	lwdown(:) = 0.0
[3900]	292	snow_cont_air(:) = 0. ! the snow content in air is not a prognostic variable of the model
[3792]	293	alb_soil(:) = 0.4 ! before albedo(:) but here it is the ice albedo that we have to set
	294	ustar(:) = 0.
	295	pref = 100000.
	296	DO i = 1, knon
	297	swdown(i) = swnet(i)/(1-albedo(i))
	298	lwdown(i) = lwdownm(i)
	299	wind_velo(i) = u1(i)2 + v1(i)2
	300	wind_velo(i) = wind_velo(i)**0.5
	301	pexner(i) = (p1lay(i)/pref)**(RD/RCPD)
	302	dens_air(i) = p1lay(i)/RD/temp_air(i) ! dry air density
	303	zsl_height(i) = pphi1(i)/RG
	304	tsoil0(i,:) = tsoil(i,:)
	305	ustar(i)= (cdragm(i)(wind_velo(i)2))*0.5
	306	END DO
	307
	308
	309
[3900]	310	dtis=dtime
[3792]	311
[3900]	312	IF (lafin) THEN
[3792]	313	lafin_is=.true.
	314	END IF
	315
[3900]	316	CALL surf_inlandsis(knon, rlon, rlat, knindex, itime, dtis, debut_is, lafin_is,&
	317	rmu0, swdown, lwdown, albedo, pexner, ps, p1lay, precip_rain, precip_snow, &
	318	zsl_height, wind_velo, ustar, temp_air, dens_air, spechum, tsurf,&
	319	rugoro, snow_cont_air, alb_soil, alt, slope, cloudf, &
	320	radsol, qsol, tsoil0, snow, zfra, snowhgt, qsnow, to_ice, sissnow,agesno, &
[3792]	321	AcoefH, AcoefQ, BcoefH, BcoefQ, cdragm, cdragh, &
[3900]	322	run_off_lic, fqfonte, ffonte, evap, erod, fluxsens, fluxlat,dflux_s, dflux_l, &
	323	tsurf_new, alb1, alb2, alb3, alb6, &
	324	emis_new, z0m, z0h, qsurf)
[3792]	325
[3900]	326	debut_is=.false.
[3792]	327
	328
[3900]	329	! Treatment of snow melting and calving
[3792]	330
[3900]	331	! for consistency with standard LMDZ, add calving to run_off_lic
	332	run_off_lic(:)=run_off_lic(:) + to_ice(:)
	333
	334	DO i = 1, knon
	335	ffonte_global(knindex(i),is_lic) = ffonte(i)
	336	fqfonte_global(knindex(i),is_lic) = fqfonte(i)! net melting= melting - refreezing
	337	fqcalving_global(knindex(i),is_lic) = to_ice(i) ! flux
	338	runofflic_global(knindex(i)) = run_off_lic(i)
	339	ENDDO
	340	! Here, we assume that the calving term is equal to the to_ice term
	341	! (no ice accumulation)
	342
	343
[3792]	344	#else
[3901]	345	abort_message='Pb de coherence: landice_opt = 1 mais CPP_INLANDSIS = .false.'
[3792]	346	CALL abort_physic(modname,abort_message,1)
	347	#endif
	348
	349
	350	ELSE
	351
	352	!****************************************************************************************
[781]	353	! Soil calculations
	354	!
	355	!****************************************************************************************
[3780]	356
	357	! EV: use calbeta
	358	CALL calbeta(dtime, is_lic, knon, snow, qsol, beta, cal, dif_grnd)
	359
	360
	361	! use soil model and recalculate properly cal
[781]	362	IF (soil_model) THEN
[3974]	363	CALL soil(dtime, is_lic, knon, snow, tsurf, qsol, &
	364	& longitude(knindex(1:knon)), latitude(knindex(1:knon)), tsoil, soilcap, soilflux)
[781]	365	cal(1:knon) = RCPD / soilcap(1:knon)
	366	radsol(1:knon) = radsol(1:knon) + soilflux(1:knon)
	367	ELSE
	368	cal = RCPD * calice
	369	WHERE (snow > 0.0) cal = RCPD * calsno
	370	ENDIF
	371
	372
	373	!****************************************************************************************
	374	! Calulate fluxes
	375	!
	376	!****************************************************************************************
[3792]	377	! beta(:) = 1.0
	378	! dif_grnd(:) = 0.0
[781]	379
[1067]	380	! Suppose zero surface speed
	381	u0(:)=0.0
	382	v0(:)=0.0
	383	u1_lay(:) = u1(:) - u0(:)
	384	v1_lay(:) = v1(:) - v0(:)
	385
[781]	386	CALL calcul_fluxs(knon, is_lic, dtime, &
[2254]	387	tsurf, p1lay, cal, beta, cdragh, cdragh, ps, &
[781]	388	precip_rain, precip_snow, snow, qsurf, &
[2240]	389	radsol, dif_grnd, temp_air, spechum, u1_lay, v1_lay, gustiness, &
[2254]	390	1.,AcoefH, AcoefQ, BcoefH, BcoefQ, &
[781]	391	tsurf_new, evap, fluxlat, fluxsens, dflux_s, dflux_l)
	392
[5202]	393	#ifdef ISO
	394	#ifdef ISOVERIF
	395	!write(,) 'surf_land_ice 1499'
	396	DO i=1,knon
	397	IF (iso_eau > 0) THEN
	398	IF (snow(i) > ridicule) THEN
	399	CALL iso_verif_egalite_choix(xtsnow(iso_eau,i),snow(i), &
	400	& 'surf_land_ice 1151',errmax,errmaxrel)
	401	ENDIF !IF ((snow(i) > ridicule)) THEN
	402	ENDIF !IF (iso_eau > 0) THEN
	403	ENDDO !DO i=1,knon
	404	#endif
	405
	406	DO i=1,knon
	407	snow_prec(i)=snow(i)
	408	DO ixt=1,niso
	409	xtsnow_prec(ixt,i)=xtsnow(ixt,i)
	410	ENDDO !DO ixt=1,niso
	411	! initialisation:
	412	fq_fonte_diag(i)=0.0
	413	fqfonte_diag(i)=0.0
	414	snow_evap_diag(i)=0.0
	415	ENDDO !DO i=1,knon
	416	#endif
	417
[1067]	418	CALL calcul_flux_wind(knon, dtime, &
[2240]	419	u0, v0, u1, v1, gustiness, cdragm, &
[1067]	420	AcoefU, AcoefV, BcoefU, BcoefV, &
	421	p1lay, temp_air, &
	422	flux_u1, flux_v1)
[781]	423
	424
	425	!****************************************************************************************
	426	! Calculate albedo
	427	!
	428	!****************************************************************************************
[3780]	429
[781]	430	!
	431	!IM: plusieurs choix/tests sur l'albedo des "glaciers continentaux"
[888]	432	! alb1(1 : knon) = 0.6 !IM cf FH/GK
	433	! alb1(1 : knon) = 0.82
	434	! alb1(1 : knon) = 0.77 !211003 Ksta0.77
	435	! alb1(1 : knon) = 0.8 !KstaTER0.8 & LMD_ARMIP5
[781]	436	!IM: KstaTER0.77 & LMD_ARMIP6
	437
[3780]	438	! Attantion: alb1 and alb2 are not the same!
[2728]	439	alb1(1:knon) = alb_vis_sno_lic
	440	alb2(1:knon) = alb_nir_sno_lic
[781]	441
	442
	443	!****************************************************************************************
	444	! Rugosity
	445	!
	446	!****************************************************************************************
[2243]	447
[5202]	448	if (z0m_landice .GT. 0.) then
	449	z0m(1:knon) = z0m_landice
	450	z0h(1:knon) = z0h_landice
	451	else
[5203]	452	! parameterization of z0=f(T) following measurements in Adelie Land by Amory et al 2017
[5202]	453	coefa = 0.1658 !0.1862 !Ant
	454	coefb = -50.3869 !-55.7718 !Ant
	455	ta1 = 253.15 !255. Ant
	456	ta2 = 273.15
	457	ta3 = 273.15+3
	458	z01 = exp(coefa*ta1 + coefb) !~0.2 ! ~0.25 mm
	459	z02 = exp(coefa*ta2 + coefb) !~6 !~7 mm
	460	z03 = z01
	461	coefc = log(z03/z02)/(ta3-ta2)
	462	coefd = log(z03)-coefc*ta3
[5203]	463	time_tempsmooth=2.*86400.
	464	coef_tempsmooth=min(1.,dtime/time_tempsmooth)
	465	!coef_tempsmooth=0.
[5202]	466	do j=1,knon
[5203]	467	i=knindex(j)
	468	tempsmoothlic(i)=temp_air(j)coef_tempsmooth+tempsmoothlic(i)(1.-coef_tempsmooth)
	469	if (tempsmoothlic(i) .lt. ta1) then
[5202]	470	z0m(j) = z01
[5203]	471	else if (tempsmoothlic(i).ge.ta1 .and. tempsmoothlic(i).lt.ta2) then
	472	z0m(j) = exp(coefa*tempsmoothlic(i) + coefb)
	473	else if (tempsmoothlic(i).ge.ta2 .and. tempsmoothlic(i).lt.ta3) then
[5202]	474	! if st > 0, melting induce smooth surface
[5203]	475	z0m(j) = exp(coefc*tempsmoothlic(i) + coefd)
[5202]	476	else
	477	z0m(j) = z03
	478	endif
	479	z0h(j)=z0m(j)
	480	enddo
[781]	481
[5202]	482	endif
	483
	484
[4835]	485	!****************************************************************************************
	486	! Simple blowing snow param
	487	!****************************************************************************************
	488	! we proceed in 2 steps:
	489	! first we erode - if possible -the accumulated snow during the time step
	490	! then we update the density of the underlying layer and see if we can also erode
	491	! this layer
[1865]	492
[4529]	493
[4835]	494	if (ok_bs) then
	495	fluxbs(:)=0.
[5202]	496	do j=1,knon
[4835]	497	ws1(j)=(u1(j)2+v1(j)2)**0.5
	498	ustar(j)=(cdragm(j)(u1(j)2+v1(j)2))*0.5
	499	rhod(j)=p1lay(j)/RD/temp_air(j)
	500	ustart0(j) =(log(2.868)-log(1.625))/0.085*sqrt(cdragm(j))
	501	enddo
	502
	503	! 1st step: erosion of fresh snow accumulated during the time step
	504	do j=1, knon
[4916]	505	if (precip_snow(j) .GT. 0.) then
[4835]	506	rhos(j)=rhofresh_bs
	507	! blowing snow flux formula used in MAR
	508	ustart(j)=ustart0(j)exp(max(rhoice_bs/rhofresh_bs-rhoice_bs/rhos(j),0.))exp(max(0.,rhos(j)-rhohard_bs))
	509	! we have multiplied by exp to prevent erosion when rhos>rhohard_bs
	510	! computation of qbs at the top of the saltation layer
	511	! default formulation from MAR model (Amory et al. 2021, Gallee et al. 2001)
	512	esalt=1./(c_esalt_bs*max(1.e-6,ustar(j)))
	513	hsalt(j)=0.08436(max(1.e-6,ustar(j))*1.27)
	514	qsalt(j)=(max(ustar(j)2-ustart(j)2,0.))/(RGhsalt(j))esalt
	515	! calculation of erosion (flux positive towards the surface here)
	516	! consistent with implicit resolution of turbulent mixing equation
	517	! Nemoto and Nishimura 2004 show that steady-state saltation is achieved within a time tau_eqsalt_bs of about 10s
	518	! we thus prevent snowerosion (snow particle transfer from the saltation layer to the first model level)
	519	! integrated over tau_eqsalt_bs to exceed the total mass of snow particle in the saltation layer
	520	! (rhoqsalthsalt)
	521	! during this first step we also lower bound the erosion to the amount of fresh snow accumulated during the time step
	522	maxerosion=min(precip_snow(j),hsalt(j)qsalt(j)rhod(j)/tau_eqsalt_bs)
	523
[4916]	524	fluxbs_1(j)=rhod(j)ws1(j)cdragh(j)zeta_bs(AcoefQBS(j)-qsalt(j)) &
	525	/ (1.-rhod(j)ws1(j)cdragh(j)zeta_bsBcoefQBS(j)*dtime)
	526	fluxbs_1(j)=max(-maxerosion,fluxbs_1(j))
	527
	528	if (precip_snow(j) .gt. abs(fluxbs_1(j))) then
	529	ok_remaining_freshsnow(j)=.true.
	530	bsweight_fresh(j)=1.
	531	else
	532	ok_remaining_freshsnow(j)=.false.
	533	bsweight_fresh(j)=exp(-(abs(fluxbs_1(j))-precip_snow(j))/precip_snow(j))
	534	endif
	535	else
	536	ok_remaining_freshsnow(j)=.false.
	537	fluxbs_1(j)=0.
	538	bsweight_fresh(j)=0.
	539	endif
[4835]	540	enddo
	541
	542
	543	! we now compute the snow age of the overlying layer (snow surface after erosion of the fresh snow accumulated during the time step)
	544	! this is done through the routine albsno
[4916]	545	CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:)+fluxbs_1(:))
[4835]	546
	547	! 2nd step:
[4529]	548	! computation of threshold friction velocity
	549	! which depends on surface snow density
[4672]	550	do j = 1, knon
[4916]	551	if (ok_remaining_freshsnow(j)) then
	552	fluxbs_2(j)=0.
	553	else
	554	! we start eroding the underlying layer
[4523]	555	! estimation of snow density
	556	! snow density increases with snow age and
[4672]	557	! increases even faster in case of sedimentation of blowing snow or rain
[4835]	558	tau_dens=max(tau_densmin_bs, tau_dens0_bs*exp(-abs(precip_bs(j))/pbst_bs - &
	559	abs(precip_rain(j))/prt_bs)*exp(-max(tsurf(j)-RTT,0.)))
	560	rhos(j)=rhofresh_bs+(rhohard_bs-rhofresh_bs)(1.-exp(-agesno(j)86400.0/tau_dens))
[4523]	561	! blowing snow flux formula used in MAR
[4835]	562	ustart(j)=ustart0(j)exp(max(rhoice_bs/rhofresh_bs-rhoice_bs/rhos(j),0.))exp(max(0.,rhos(j)-rhohard_bs))
	563	! we have multiplied by exp to prevent erosion when rhos>rhohard_bs
	564	! computation of qbs at the top of the saltation layer
	565	! default formulation from MAR model (Amory et al. 2021, Gallee et al. 2001)
[4916]	566	esalt=1./(c_esalt_bs*max(1.e-6,ustar(j)))
[4835]	567	hsalt(j)=0.08436(max(1.e-6,ustar(j))*1.27)
	568	qsalt(j)=(max(ustar(j)2-ustart(j)2,0.))/(RGhsalt(j))esalt
	569	! calculation of erosion (flux positive towards the surface here)
	570	! consistent with implicit resolution of turbulent mixing equation
	571	! Nemoto and Nishimura 2004 show that steady-state saltation is achieved within a time tau_eqsalt_bs of about 10s
	572	! we thus prevent snowerosion (snow particle transfer from the saltation layer to the first model level)
	573	! integrated over tau_eqsalt_bs to exceed the total mass of snow particle in the saltation layer
	574	! (rhoqsalthsalt)
	575	maxerosion=hsalt(j)qsalt(j)rhod(j)/tau_eqsalt_bs
[4916]	576	fluxbs_2(j)=rhod(j)ws1(j)cdragh(j)zeta_bs(AcoefQBS(j)-qsalt(j)) &
	577	/ (1.-rhod(j)ws1(j)cdragh(j)zeta_bsBcoefQBS(j)*dtime)
	578	fluxbs_2(j)=max(-maxerosion,fluxbs_2(j))
	579	endif
[4523]	580	enddo
	581
[4916]	582
	583
	584
	585	! final flux and outputs
[4835]	586	do j=1, knon
[4916]	587	! total flux is the erosion of fresh snow +
	588	! a fraction of the underlying snow (if all the fresh snow has been eroded)
	589	! the calculation of the fraction is quite delicate since we do not know
	590	! how much time was needed to erode the fresh snow. We assume that this time
	591	! is dtexp(-(abs(fluxbs1)-precipsnow)/precipsnow)=dtbsweight_fresh
	592
	593	fluxbs(j)=fluxbs_1(j)+fluxbs_2(j)*(1.-bsweight_fresh(j))
[4672]	594	i = knindex(j)
	595	zxustartlic(i) = ustart(j)
	596	zxrhoslic(i) = rhos(j)
[4835]	597	zxqsaltlic(i)=qsalt(j)
	598	enddo
[4523]	599
	600
[4916]	601	else ! not ok_bs
[4835]	602	! those lines are useful to calculate the snow age
	603	CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:))
[4523]	604
[4835]	605	endif ! if ok_bs
[4523]	606
[4835]	607
	608
[4523]	609	!****************************************************************************************
[4672]	610	! Calculate snow amount
[4523]	611	!
	612	!****************************************************************************************
	613	IF (ok_bs) THEN
[4526]	614	precip_totsnow(:)=precip_snow(:)+precip_bs(:)
	615	evap_totsnow(:)=evap(:)-fluxbs(:) ! flux bs is positive towards the surface (snow erosion)
[4523]	616	ELSE
[4526]	617	precip_totsnow(:)=precip_snow(:)
	618	evap_totsnow(:)=evap(:)
[4523]	619	ENDIF
[4672]	620
	621
[4523]	622	CALL fonte_neige(knon, is_lic, knindex, dtime, &
[5202]	623	tsurf, precip_rain, precip_totsnow, &
	624	snow, qsol, tsurf_new, evap_totsnow &
	625	#ifdef ISO
	626	& ,fq_fonte_diag,fqfonte_diag,snow_evap_diag,fqcalving_diag &
	627	& ,max_eau_sol_diag,runoff_diag,run_off_lic_diag,coeff_rel_diag &
	628	#endif
	629	& )
	630
	631
	632	#ifdef ISO
	633	#ifdef ISOVERIF
	634	DO i=1,knon
	635	IF (iso_eau > 0) THEN
	636	CALL iso_verif_egalite_choix(Rland_ice(iso_eau,i),1.0, &
	637	& 'surf_landice_mod 217',errmax,errmaxrel)
	638	ENDIF !IF (iso_eau > 0) THEN
	639	ENDDO !DO i=1,knon
	640	#endif
	641
	642	CALL calcul_iso_surf_lic_vectall(klon,knon, &
	643	& evap,snow_evap_diag,Tsurf_new,snow, &
	644	& fq_fonte_diag,fqfonte_diag,dtime,t_coup, &
	645	& precip_snow,xtprecip_snow,precip_rain,xtprecip_rain, snow_prec,xtsnow_prec, &
	646	& xtspechum,spechum,ps,Rland_ice, &
	647	& xtevap,xtsnow,fqcalving_diag, &
	648	& knindex,is_lic,run_off_lic_diag,coeff_rel_diag &
	649	& )
	650
	651	! call fonte_neige_export_xtrun_off_lic_0(knon,xtrun_off_lic_0_diag)
	652
	653	#endif
[4672]	654
[4523]	655	WHERE (snow(1 : knon) .LT. 0.0001) agesno(1 : knon) = 0.
	656	zfra(1:knon) = MAX(0.0,MIN(1.0,snow(1:knon)/(snow(1:knon)+10.0)))
	657
	658
[3792]	659	END IF ! landice_opt
	660
	661
[781]	662	!****************************************************************************************
	663	! Send run-off on land-ice to coupler if coupled ocean.
[3903]	664	! run_off_lic has been calculated in fonte_neige or surf_inlandsis
[4283]	665	! If landice_opt>=2, corresponding call is done from surf_land_orchidee
[781]	666	!****************************************************************************************
[4283]	667	IF (type_ocean=='couple' .AND. landice_opt .LT. 2) THEN
	668	! Compress fraction where run_off_lic is active (here all pctsrf(is_lic))
	669	run_off_lic_frac(:)=0.0
	670	DO j = 1, knon
	671	i = knindex(j)
	672	run_off_lic_frac(j) = pctsrf(i,is_lic)
	673	ENDDO
	674
	675	CALL cpl_send_landice_fields(itime, knon, knindex, run_off_lic, run_off_lic_frac)
[781]	676	ENDIF
[1865]	677
	678	! transfer runoff rate [kg/m2/s](!) to physiq for output
	679	runoff(1:knon)=run_off_lic(1:knon)/dtime
	680
[1403]	681	snow_o=0.
	682	zfra_o = 0.
	683	DO j = 1, knon
	684	i = knindex(j)
	685	snow_o(i) = snow(j)
	686	zfra_o(i) = zfra(j)
	687	ENDDO
	688
	689
[2227]	690	!albedo SB >>>
	691	select case(NSW)
	692	case(2)
	693	alb_dir(1:knon,1)=alb1(1:knon)
	694	alb_dir(1:knon,2)=alb2(1:knon)
	695	case(4)
	696	alb_dir(1:knon,1)=alb1(1:knon)
	697	alb_dir(1:knon,2)=alb2(1:knon)
	698	alb_dir(1:knon,3)=alb2(1:knon)
	699	alb_dir(1:knon,4)=alb2(1:knon)
	700	case(6)
	701	alb_dir(1:knon,1)=alb1(1:knon)
	702	alb_dir(1:knon,2)=alb1(1:knon)
	703	alb_dir(1:knon,3)=alb1(1:knon)
	704	alb_dir(1:knon,4)=alb2(1:knon)
	705	alb_dir(1:knon,5)=alb2(1:knon)
	706	alb_dir(1:knon,6)=alb2(1:knon)
[3900]	707
[3901]	708	IF ((landice_opt .EQ. 1) .AND. (iflag_albcalc .EQ. 2)) THEN
[3900]	709	alb_dir(1:knon,1)=alb6(1:knon,1)
	710	alb_dir(1:knon,2)=alb6(1:knon,2)
	711	alb_dir(1:knon,3)=alb6(1:knon,3)
	712	alb_dir(1:knon,4)=alb6(1:knon,4)
	713	alb_dir(1:knon,5)=alb6(1:knon,5)
	714	alb_dir(1:knon,6)=alb6(1:knon,6)
	715	ENDIF
	716
[2227]	717	end select
	718	alb_dif=alb_dir
	719	!albedo SB <<<
	720
	721
[781]	722	END SUBROUTINE surf_landice
	723	!
	724	!****************************************************************************************
	725	!
	726	END MODULE surf_landice_mod
	727
	728
	729

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