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surf_landice_mod.F90 @ 5489

Last change on this file since 5489 was 5489, checked in by aborella, 13 days ago
Merge with 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: 27.9 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, &
[5489]	20	tsoil, z0m, z0h, SFRWL, alb_dir, alb_dif, evap, icesub_lic, 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, &
[5022]	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
[5188]	38	USE phys_local_var_mod, ONLY : zxrhoslic, zxustartlic, zxqsaltlic, tempsmoothlic
[4414]	39	USE phys_output_var_mod, ONLY : snow_o,zfra_o
[5022]	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
[5282]	50	USE clesphys_mod_h
[5285]	51	USE yomcst_mod_h
[5489]	52	USE ioipsl_getin_p_mod, ONLY : getin_p
[4835]	53	USE lmdz_blowing_snow_ini, ONLY : c_esalt_bs, zeta_bs, pbst_bs, prt_bs, rhoice_bs, rhohard_bs
	54	USE lmdz_blowing_snow_ini, ONLY : rhofresh_bs, tau_eqsalt_bs, tau_dens0_bs, tau_densmin_bs
[3792]	55	USE surf_inlandsis_mod, ONLY : surf_inlandsis
	56
[1785]	57	USE indice_sol_mod
[5259]	58	USE lmdz_cppkeys_wrapper, ONLY: CPPKEY_INLANDSIS
[5273]	59	USE dimsoil_mod_h, ONLY: nsoilmx
[1067]	60
[5274]	61
[781]	62
	63	! Input variables
	64	!****************************************************************************************
	65	INTEGER, INTENT(IN) :: itime, knon
	66	INTEGER, DIMENSION(klon), INTENT(in) :: knindex
	67	REAL, INTENT(in) :: dtime
[888]	68	REAL, DIMENSION(klon), INTENT(IN) :: swnet ! net shortwave radiance
	69	REAL, DIMENSION(klon), INTENT(IN) :: lwnet ! net longwave radiance
[781]	70	REAL, DIMENSION(klon), INTENT(IN) :: tsurf
	71	REAL, DIMENSION(klon), INTENT(IN) :: p1lay
[1067]	72	REAL, DIMENSION(klon), INTENT(IN) :: cdragh, cdragm
[4523]	73	REAL, DIMENSION(klon), INTENT(IN) :: precip_rain, precip_snow, precip_bs
[781]	74	REAL, DIMENSION(klon), INTENT(IN) :: temp_air, spechum
[1067]	75	REAL, DIMENSION(klon), INTENT(IN) :: AcoefH, AcoefQ
	76	REAL, DIMENSION(klon), INTENT(IN) :: BcoefH, BcoefQ
	77	REAL, DIMENSION(klon), INTENT(IN) :: AcoefU, AcoefV, BcoefU, BcoefV
[4529]	78	REAL, DIMENSION(klon), INTENT(IN) :: AcoefQBS, BcoefQBS
[781]	79	REAL, DIMENSION(klon), INTENT(IN) :: ps
[4523]	80	REAL, DIMENSION(klon), INTENT(IN) :: u1, v1, gustiness, qbs1
[781]	81	REAL, DIMENSION(klon), INTENT(IN) :: rugoro
	82	REAL, DIMENSION(klon,nbsrf), INTENT(IN) :: pctsrf
[5022]	83	#ifdef ISO
	84	REAL, DIMENSION(ntiso,klon), INTENT(IN) :: xtprecip_rain, xtprecip_snow
	85	REAL, DIMENSION(ntiso,klon), INTENT(IN) :: xtspechum
	86	#endif
[781]	87
[5022]	88
[1865]	89	LOGICAL, INTENT(IN) :: debut !true if first step
	90	LOGICAL, INTENT(IN) :: lafin !true if last step
	91	REAL, DIMENSION(klon), INTENT(IN) :: rlon, rlat
	92	REAL, DIMENSION(klon), INTENT(IN) :: rmu0
	93	REAL, DIMENSION(klon), INTENT(IN) :: lwdownm !ylwdown
	94	REAL, DIMENSION(klon), INTENT(IN) :: albedo !mean albedo
	95	REAL, DIMENSION(klon), INTENT(IN) :: pphi1
[3900]	96	REAL, DIMENSION(klon), INTENT(IN) :: alt !mean altitude of the grid box
[1865]	97	REAL, DIMENSION(klon), INTENT(IN) :: slope !mean slope in grid box
	98	REAL, DIMENSION(klon), INTENT(IN) :: cloudf !total cloud fraction
	99
[781]	100	! In/Output variables
	101	!****************************************************************************************
	102	REAL, DIMENSION(klon), INTENT(INOUT) :: snow, qsol
	103	REAL, DIMENSION(klon), INTENT(INOUT) :: agesno
	104	REAL, DIMENSION(klon, nsoilmx), INTENT(INOUT) :: tsoil
[5022]	105	#ifdef ISO
	106	REAL, DIMENSION(niso,klon), INTENT(INOUT) :: xtsnow, xtsol
	107	REAL, DIMENSION(niso,klon), INTENT(INOUT) :: Rland_ice
	108	#endif
[781]	109
[5022]	110
[781]	111	! Output variables
	112	!****************************************************************************************
	113	REAL, DIMENSION(klon), INTENT(OUT) :: qsurf
[2243]	114	REAL, DIMENSION(klon), INTENT(OUT) :: z0m, z0h
[2227]	115	!albedo SB >>>
	116	! REAL, DIMENSION(klon), INTENT(OUT) :: alb1 ! new albedo in visible SW interval
	117	! REAL, DIMENSION(klon), INTENT(OUT) :: alb2 ! new albedo in near IR interval
[3792]	118	REAL, DIMENSION(6), INTENT(IN) :: SFRWL
	119	REAL, DIMENSION(klon,nsw), INTENT(OUT) :: alb_dir,alb_dif
[2227]	120	!albedo SB <<<
[5489]	121	REAL, DIMENSION(klon), INTENT(OUT) :: evap, fluxsens, fluxlat, icesub_lic
[4523]	122	REAL, DIMENSION(klon), INTENT(OUT) :: fluxbs
[888]	123	REAL, DIMENSION(klon), INTENT(OUT) :: tsurf_new
[781]	124	REAL, DIMENSION(klon), INTENT(OUT) :: dflux_s, dflux_l
[1067]	125	REAL, DIMENSION(klon), INTENT(OUT) :: flux_u1, flux_v1
[781]	126
[1865]	127	REAL, DIMENSION(klon), INTENT(OUT) :: alb3
	128	REAL, DIMENSION(klon), INTENT(OUT) :: qsnow !column water in snow [kg/m2]
	129	REAL, DIMENSION(klon), INTENT(OUT) :: snowhgt !Snow height (m)
	130	REAL, DIMENSION(klon), INTENT(OUT) :: to_ice
	131	REAL, DIMENSION(klon), INTENT(OUT) :: sissnow
	132	REAL, DIMENSION(klon), INTENT(OUT) :: runoff !Land ice runoff
[5022]	133	#ifdef ISO
	134	REAL, DIMENSION(ntiso,klon), INTENT(OUT) :: xtevap
	135	#endif
[1865]	136
	137
[781]	138	! Local variables
	139	!****************************************************************************************
	140	REAL, DIMENSION(klon) :: soilcap, soilflux
	141	REAL, DIMENSION(klon) :: cal, beta, dif_grnd
	142	REAL, DIMENSION(klon) :: zfra, alb_neig
[888]	143	REAL, DIMENSION(klon) :: radsol
[3792]	144	REAL, DIMENSION(klon) :: u0, v0, u1_lay, v1_lay, ustar
	145	INTEGER :: i,j,nt
[3900]	146	REAL, DIMENSION(klon) :: fqfonte,ffonte
[4283]	147	REAL, DIMENSION(klon) :: run_off_lic_frac
[5022]	148	#ifdef ISO
	149	REAL, PARAMETER :: t_coup = 273.15
	150	REAL, DIMENSION(klon) :: fqfonte_diag
	151	REAL, DIMENSION(klon) :: fq_fonte_diag
	152	REAL, DIMENSION(klon) :: snow_evap_diag
	153	REAL, DIMENSION(klon) :: fqcalving_diag
	154	REAL max_eau_sol_diag
	155	REAL, DIMENSION(klon) :: runoff_diag
	156	REAL, DIMENSION(klon) :: run_off_lic_diag
	157	REAL :: coeff_rel_diag
	158	INTEGER :: ixt
	159	REAL, DIMENSION(niso,klon) :: xtsnow_prec,xtsol_prec
	160	REAL, DIMENSION(klon) :: snow_prec,qsol_prec
	161	#endif
	162
	163
[1865]	164	REAL, DIMENSION(klon) :: emis_new !Emissivity
	165	REAL, DIMENSION(klon) :: swdown,lwdown
[3900]	166	REAL, DIMENSION(klon) :: precip_snow_adv, snow_adv !Snow Drift precip./advection (not used in inlandsis)
	167	REAL, DIMENSION(klon) :: erod !erosion of surface snow (flux, kg/m2/s like evap)
	168	REAL, DIMENSION(klon) :: zsl_height, wind_velo !surface layer height, wind spd
[1865]	169	REAL, DIMENSION(klon) :: dens_air, snow_cont_air !air density; snow content air
	170	REAL, DIMENSION(klon) :: alb_soil !albedo of underlying ice
	171	REAL, DIMENSION(klon) :: pexner !Exner potential
	172	REAL :: pref
[3792]	173	REAL, DIMENSION(klon,nsoilmx) :: tsoil0 !modif
	174	REAL :: dtis ! subtimestep
	175	LOGICAL :: debut_is, lafin_is ! debut and lafin for inlandsis
[1865]	176
	177	CHARACTER (len = 20) :: modname = 'surf_landice'
	178	CHARACTER (len = 80) :: abort_message
	179
[2728]	180
[3900]	181	REAL,DIMENSION(klon) :: alb1,alb2
[5188]	182	REAL :: time_tempsmooth,coef_tempsmooth
[4523]	183	REAL,DIMENSION(klon) :: precip_totsnow, evap_totsnow
[3900]	184	REAL, DIMENSION (klon,6) :: alb6
[4835]	185	REAL :: esalt
[4529]	186	REAL :: lambdasalt,fluxsalt, csalt, nunu, aa, bb, cc
[4916]	187	REAL :: tau_dens, maxerosion
[4835]	188	REAL, DIMENSION(klon) :: ws1, rhod, rhos, ustart0, ustart, qsalt, hsalt
[4916]	189	REAL, DIMENSION(klon) :: fluxbs_1, fluxbs_2, bsweight_fresh
	190	LOGICAL, DIMENSION(klon) :: ok_remaining_freshsnow
[4947]	191	REAL :: ta1, ta2, ta3, z01, z02, z03, coefa, coefb, coefc, coefd
[4672]	192
[4947]	193
[781]	194	! End definition
	195	!****************************************************************************************
[2728]	196	!FC
	197	!FC
	198	REAL,SAVE :: alb_vis_sno_lic
	199	!$OMP THREADPRIVATE(alb_vis_sno_lic)
	200	REAL,SAVE :: alb_nir_sno_lic
	201	!$OMP THREADPRIVATE(alb_nir_sno_lic)
	202	LOGICAL, SAVE :: firstcall = .TRUE.
	203	!$OMP THREADPRIVATE(firstcall)
	204
	205
[3792]	206	!FC firtscall initializations
	207	!******************************************************************************************
[5022]	208	#ifdef ISO
	209	#ifdef ISOVERIF
	210	! write(,) 'surf_land_ice 1499'
	211	DO i=1,knon
	212	IF (iso_eau > 0) THEN
	213	CALL iso_verif_egalite_choix(xtsnow(iso_eau,i),snow(i), &
	214	& 'surf_land_ice 126',errmax,errmaxrel)
	215	ENDIF !IF (iso_eau > 0) THEN
	216	ENDDO !DO i=1,knon
	217	#endif
	218	#endif
	219
[2728]	220	IF (firstcall) THEN
	221	alb_vis_sno_lic=0.77
	222	CALL getin_p('alb_vis_sno_lic',alb_vis_sno_lic)
	223	PRINT*, 'alb_vis_sno_lic',alb_vis_sno_lic
	224	alb_nir_sno_lic=0.77
	225	CALL getin_p('alb_nir_sno_lic',alb_nir_sno_lic)
	226	PRINT*, 'alb_nir_sno_lic',alb_nir_sno_lic
[3792]	227
[5188]	228	DO j=1,knon
	229	i = knindex(j)
	230	tempsmoothlic(i) = temp_air(j)
	231	ENDDO
[2728]	232	firstcall=.false.
	233	ENDIF
[3792]	234	!******************************************************************************************
	235
[781]	236	! Initialize output variables
[1865]	237	alb3(:) = 999999.
[888]	238	alb2(:) = 999999.
	239	alb1(:) = 999999.
[4523]	240	fluxbs(:)=0.
[1865]	241	runoff(:) = 0.
[888]	242	!****************************************************************************************
	243	! Calculate total absorbed radiance at surface
	244	!
	245	!****************************************************************************************
	246	radsol(:) = 0.0
	247	radsol(1:knon) = swnet(1:knon) + lwnet(1:knon)
[781]	248
	249	!****************************************************************************************
[4523]	250
	251	!****************************************************************************************
[3792]	252	! landice_opt = 0 : soil_model, calcul_flux, fonte_neige, ...
[3901]	253	! landice_opt = 1 : prepare and call INterace Lmdz SISvat (INLANDSIS)
[5489]	254	! landice_opt = 2 : skip surf_landice and use orchidee over all land surfaces
[1865]	255	!****************************************************************************************
[3792]	256
	257
	258	IF (landice_opt .EQ. 1) THEN
	259
[3901]	260	!****************************************************************************************
[3792]	261	! CALL to INLANDSIS interface
	262	!****************************************************************************************
[5259]	263	IF (CPPKEY_INLANDSIS) THEN
[3792]	264
[5022]	265	#ifdef ISO
[5217]	266	CALL abort_physic('surf_landice 235','isotopes pas dans INLANDSIS',1)
[5022]	267	#endif
	268
[3792]	269	debut_is=debut
	270	lafin_is=.false.
	271	! Suppose zero surface speed
	272	u0(:) = 0.0
	273	v0(:) = 0.0
	274
	275
	276	CALL calcul_flux_wind(knon, dtime, &
	277	u0, v0, u1, v1, gustiness, cdragm, &
	278	AcoefU, AcoefV, BcoefU, BcoefV, &
	279	p1lay, temp_air, &
	280	flux_u1, flux_v1)
	281
	282
	283	! Set constants and compute some input for SISVAT
	284	! = 1000 hPa
	285	! and calculate incoming flux for SW and LW interval: swdown, lwdown
	286	swdown(:) = 0.0
	287	lwdown(:) = 0.0
[3900]	288	snow_cont_air(:) = 0. ! the snow content in air is not a prognostic variable of the model
[3792]	289	alb_soil(:) = 0.4 ! before albedo(:) but here it is the ice albedo that we have to set
	290	ustar(:) = 0.
	291	pref = 100000.
	292	DO i = 1, knon
	293	swdown(i) = swnet(i)/(1-albedo(i))
	294	lwdown(i) = lwdownm(i)
	295	wind_velo(i) = u1(i)2 + v1(i)2
	296	wind_velo(i) = wind_velo(i)**0.5
	297	pexner(i) = (p1lay(i)/pref)**(RD/RCPD)
	298	dens_air(i) = p1lay(i)/RD/temp_air(i) ! dry air density
	299	zsl_height(i) = pphi1(i)/RG
	300	tsoil0(i,:) = tsoil(i,:)
	301	ustar(i)= (cdragm(i)(wind_velo(i)2))*0.5
	302	END DO
	303
	304
	305
[3900]	306	dtis=dtime
[3792]	307
[3900]	308	IF (lafin) THEN
[3792]	309	lafin_is=.true.
	310	END IF
	311
[3900]	312	CALL surf_inlandsis(knon, rlon, rlat, knindex, itime, dtis, debut_is, lafin_is,&
	313	rmu0, swdown, lwdown, albedo, pexner, ps, p1lay, precip_rain, precip_snow, &
	314	zsl_height, wind_velo, ustar, temp_air, dens_air, spechum, tsurf,&
	315	rugoro, snow_cont_air, alb_soil, alt, slope, cloudf, &
	316	radsol, qsol, tsoil0, snow, zfra, snowhgt, qsnow, to_ice, sissnow,agesno, &
[3792]	317	AcoefH, AcoefQ, BcoefH, BcoefQ, cdragm, cdragh, &
[3900]	318	run_off_lic, fqfonte, ffonte, evap, erod, fluxsens, fluxlat,dflux_s, dflux_l, &
	319	tsurf_new, alb1, alb2, alb3, alb6, &
	320	emis_new, z0m, z0h, qsurf)
[3792]	321
[3900]	322	debut_is=.false.
[3792]	323
	324
[3900]	325	! Treatment of snow melting and calving
[3792]	326
[3900]	327	! for consistency with standard LMDZ, add calving to run_off_lic
	328	run_off_lic(:)=run_off_lic(:) + to_ice(:)
	329
	330	DO i = 1, knon
	331	ffonte_global(knindex(i),is_lic) = ffonte(i)
	332	fqfonte_global(knindex(i),is_lic) = fqfonte(i)! net melting= melting - refreezing
	333	fqcalving_global(knindex(i),is_lic) = to_ice(i) ! flux
	334	runofflic_global(knindex(i)) = run_off_lic(i)
	335	ENDDO
	336	! Here, we assume that the calving term is equal to the to_ice term
	337	! (no ice accumulation)
	338
	339
[5259]	340	ELSE
[3901]	341	abort_message='Pb de coherence: landice_opt = 1 mais CPP_INLANDSIS = .false.'
[3792]	342	CALL abort_physic(modname,abort_message,1)
[5259]	343	END IF
[3792]	344
	345
	346	ELSE
	347
	348	!****************************************************************************************
[781]	349	! Soil calculations
	350	!
	351	!****************************************************************************************
[3780]	352
	353	! EV: use calbeta
	354	CALL calbeta(dtime, is_lic, knon, snow, qsol, beta, cal, dif_grnd)
	355
	356
	357	! use soil model and recalculate properly cal
[781]	358	IF (soil_model) THEN
[3974]	359	CALL soil(dtime, is_lic, knon, snow, tsurf, qsol, &
	360	& longitude(knindex(1:knon)), latitude(knindex(1:knon)), tsoil, soilcap, soilflux)
[781]	361	cal(1:knon) = RCPD / soilcap(1:knon)
	362	radsol(1:knon) = radsol(1:knon) + soilflux(1:knon)
	363	ELSE
	364	cal = RCPD * calice
	365	WHERE (snow > 0.0) cal = RCPD * calsno
	366	ENDIF
	367
	368
	369	!****************************************************************************************
	370	! Calulate fluxes
	371	!
	372	!****************************************************************************************
	373
[1067]	374	! Suppose zero surface speed
	375	u0(:)=0.0
	376	v0(:)=0.0
	377	u1_lay(:) = u1(:) - u0(:)
	378	v1_lay(:) = v1(:) - v0(:)
	379
[781]	380	CALL calcul_fluxs(knon, is_lic, dtime, &
[2254]	381	tsurf, p1lay, cal, beta, cdragh, cdragh, ps, &
[781]	382	precip_rain, precip_snow, snow, qsurf, &
[2240]	383	radsol, dif_grnd, temp_air, spechum, u1_lay, v1_lay, gustiness, &
[2254]	384	1.,AcoefH, AcoefQ, BcoefH, BcoefQ, &
[781]	385	tsurf_new, evap, fluxlat, fluxsens, dflux_s, dflux_l)
	386
[5022]	387	#ifdef ISO
	388	#ifdef ISOVERIF
	389	DO i=1,knon
	390	IF (iso_eau > 0) THEN
	391	IF (snow(i) > ridicule) THEN
	392	CALL iso_verif_egalite_choix(xtsnow(iso_eau,i),snow(i), &
	393	& 'surf_land_ice 1151',errmax,errmaxrel)
	394	ENDIF !IF ((snow(i) > ridicule)) THEN
	395	ENDIF !IF (iso_eau > 0) THEN
	396	ENDDO !DO i=1,knon
	397	#endif
	398
	399	DO i=1,knon
	400	snow_prec(i)=snow(i)
	401	DO ixt=1,niso
	402	xtsnow_prec(ixt,i)=xtsnow(ixt,i)
	403	ENDDO !DO ixt=1,niso
	404	! initialisation:
	405	fq_fonte_diag(i)=0.0
	406	fqfonte_diag(i)=0.0
	407	snow_evap_diag(i)=0.0
	408	ENDDO !DO i=1,knon
	409	#endif
	410
[1067]	411	CALL calcul_flux_wind(knon, dtime, &
[2240]	412	u0, v0, u1, v1, gustiness, cdragm, &
[1067]	413	AcoefU, AcoefV, BcoefU, BcoefV, &
	414	p1lay, temp_air, &
	415	flux_u1, flux_v1)
[781]	416
	417
	418	!****************************************************************************************
	419	! Calculate albedo
	420	!
	421	!****************************************************************************************
[3780]	422
	423	! Attantion: alb1 and alb2 are not the same!
[2728]	424	alb1(1:knon) = alb_vis_sno_lic
	425	alb2(1:knon) = alb_nir_sno_lic
[781]	426
	427
	428	!****************************************************************************************
	429	! Rugosity
	430	!
	431	!****************************************************************************************
[2243]	432
[4947]	433	if (z0m_landice .GT. 0.) then
	434	z0m(1:knon) = z0m_landice
[5364]	435	z0h(1:knon) = z0m_landice*ratio_z0hz0m_landice
[4947]	436	else
[5188]	437	! parameterization of z0=f(T) following measurements in Adelie Land by Amory et al 2017
[4947]	438	coefa = 0.1658 !0.1862 !Ant
	439	coefb = -50.3869 !-55.7718 !Ant
	440	ta1 = 253.15 !255. Ant
	441	ta2 = 273.15
	442	ta3 = 273.15+3
	443	z01 = exp(coefa*ta1 + coefb) !~0.2 ! ~0.25 mm
	444	z02 = exp(coefa*ta2 + coefb) !~6 !~7 mm
	445	z03 = z01
	446	coefc = log(z03/z02)/(ta3-ta2)
	447	coefd = log(z03)-coefc*ta3
[5188]	448	time_tempsmooth=2.*86400.
	449	coef_tempsmooth=min(1.,dtime/time_tempsmooth)
	450	!coef_tempsmooth=0.
[4947]	451	do j=1,knon
[5188]	452	i=knindex(j)
	453	tempsmoothlic(i)=temp_air(j)coef_tempsmooth+tempsmoothlic(i)(1.-coef_tempsmooth)
	454	if (tempsmoothlic(i) .lt. ta1) then
[4947]	455	z0m(j) = z01
[5188]	456	else if (tempsmoothlic(i).ge.ta1 .and. tempsmoothlic(i).lt.ta2) then
	457	z0m(j) = exp(coefa*tempsmoothlic(i) + coefb)
	458	else if (tempsmoothlic(i).ge.ta2 .and. tempsmoothlic(i).lt.ta3) then
[4947]	459	! if st > 0, melting induce smooth surface
[5188]	460	z0m(j) = exp(coefc*tempsmoothlic(i) + coefd)
[4947]	461	else
	462	z0m(j) = z03
	463	endif
	464	z0h(j)=z0m(j)
	465	enddo
[781]	466
[4947]	467	endif
	468
	469
[4835]	470	!****************************************************************************************
	471	! Simple blowing snow param
	472	!****************************************************************************************
	473	! we proceed in 2 steps:
	474	! first we erode - if possible -the accumulated snow during the time step
	475	! then we update the density of the underlying layer and see if we can also erode
	476	! this layer
[1865]	477
[4529]	478
[4835]	479	if (ok_bs) then
	480	fluxbs(:)=0.
[4947]	481	do j=1,knon
[4835]	482	ws1(j)=(u1(j)2+v1(j)2)**0.5
	483	ustar(j)=(cdragm(j)(u1(j)2+v1(j)2))*0.5
	484	rhod(j)=p1lay(j)/RD/temp_air(j)
	485	ustart0(j) =(log(2.868)-log(1.625))/0.085*sqrt(cdragm(j))
	486	enddo
	487
	488	! 1st step: erosion of fresh snow accumulated during the time step
	489	do j=1, knon
[4916]	490	if (precip_snow(j) .GT. 0.) then
[4835]	491	rhos(j)=rhofresh_bs
	492	! blowing snow flux formula used in MAR
	493	ustart(j)=ustart0(j)exp(max(rhoice_bs/rhofresh_bs-rhoice_bs/rhos(j),0.))exp(max(0.,rhos(j)-rhohard_bs))
	494	! we have multiplied by exp to prevent erosion when rhos>rhohard_bs
	495	! computation of qbs at the top of the saltation layer
	496	! default formulation from MAR model (Amory et al. 2021, Gallee et al. 2001)
	497	esalt=1./(c_esalt_bs*max(1.e-6,ustar(j)))
	498	hsalt(j)=0.08436(max(1.e-6,ustar(j))*1.27)
	499	qsalt(j)=(max(ustar(j)2-ustart(j)2,0.))/(RGhsalt(j))esalt
	500	! calculation of erosion (flux positive towards the surface here)
	501	! consistent with implicit resolution of turbulent mixing equation
	502	! Nemoto and Nishimura 2004 show that steady-state saltation is achieved within a time tau_eqsalt_bs of about 10s
	503	! we thus prevent snowerosion (snow particle transfer from the saltation layer to the first model level)
	504	! integrated over tau_eqsalt_bs to exceed the total mass of snow particle in the saltation layer
	505	! (rhoqsalthsalt)
	506	! during this first step we also lower bound the erosion to the amount of fresh snow accumulated during the time step
	507	maxerosion=min(precip_snow(j),hsalt(j)qsalt(j)rhod(j)/tau_eqsalt_bs)
	508
[4916]	509	fluxbs_1(j)=rhod(j)ws1(j)cdragh(j)zeta_bs(AcoefQBS(j)-qsalt(j)) &
	510	/ (1.-rhod(j)ws1(j)cdragh(j)zeta_bsBcoefQBS(j)*dtime)
	511	fluxbs_1(j)=max(-maxerosion,fluxbs_1(j))
	512
	513	if (precip_snow(j) .gt. abs(fluxbs_1(j))) then
	514	ok_remaining_freshsnow(j)=.true.
	515	bsweight_fresh(j)=1.
	516	else
	517	ok_remaining_freshsnow(j)=.false.
	518	bsweight_fresh(j)=exp(-(abs(fluxbs_1(j))-precip_snow(j))/precip_snow(j))
	519	endif
	520	else
	521	ok_remaining_freshsnow(j)=.false.
	522	fluxbs_1(j)=0.
	523	bsweight_fresh(j)=0.
	524	endif
[4835]	525	enddo
	526
	527
	528	! we now compute the snow age of the overlying layer (snow surface after erosion of the fresh snow accumulated during the time step)
	529	! this is done through the routine albsno
[4916]	530	CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:)+fluxbs_1(:))
[4835]	531
	532	! 2nd step:
[4529]	533	! computation of threshold friction velocity
	534	! which depends on surface snow density
[4672]	535	do j = 1, knon
[4916]	536	if (ok_remaining_freshsnow(j)) then
	537	fluxbs_2(j)=0.
	538	else
	539	! we start eroding the underlying layer
[4523]	540	! estimation of snow density
	541	! snow density increases with snow age and
[4672]	542	! increases even faster in case of sedimentation of blowing snow or rain
[4835]	543	tau_dens=max(tau_densmin_bs, tau_dens0_bs*exp(-abs(precip_bs(j))/pbst_bs - &
	544	abs(precip_rain(j))/prt_bs)*exp(-max(tsurf(j)-RTT,0.)))
	545	rhos(j)=rhofresh_bs+(rhohard_bs-rhofresh_bs)(1.-exp(-agesno(j)86400.0/tau_dens))
[4523]	546	! blowing snow flux formula used in MAR
[4835]	547	ustart(j)=ustart0(j)exp(max(rhoice_bs/rhofresh_bs-rhoice_bs/rhos(j),0.))exp(max(0.,rhos(j)-rhohard_bs))
	548	! we have multiplied by exp to prevent erosion when rhos>rhohard_bs
	549	! computation of qbs at the top of the saltation layer
	550	! default formulation from MAR model (Amory et al. 2021, Gallee et al. 2001)
[4916]	551	esalt=1./(c_esalt_bs*max(1.e-6,ustar(j)))
[4835]	552	hsalt(j)=0.08436(max(1.e-6,ustar(j))*1.27)
	553	qsalt(j)=(max(ustar(j)2-ustart(j)2,0.))/(RGhsalt(j))esalt
	554	! calculation of erosion (flux positive towards the surface here)
	555	! consistent with implicit resolution of turbulent mixing equation
	556	! Nemoto and Nishimura 2004 show that steady-state saltation is achieved within a time tau_eqsalt_bs of about 10s
	557	! we thus prevent snowerosion (snow particle transfer from the saltation layer to the first model level)
	558	! integrated over tau_eqsalt_bs to exceed the total mass of snow particle in the saltation layer
	559	! (rhoqsalthsalt)
	560	maxerosion=hsalt(j)qsalt(j)rhod(j)/tau_eqsalt_bs
[4916]	561	fluxbs_2(j)=rhod(j)ws1(j)cdragh(j)zeta_bs(AcoefQBS(j)-qsalt(j)) &
	562	/ (1.-rhod(j)ws1(j)cdragh(j)zeta_bsBcoefQBS(j)*dtime)
	563	fluxbs_2(j)=max(-maxerosion,fluxbs_2(j))
	564	endif
[4523]	565	enddo
	566
[4916]	567
	568
	569
	570	! final flux and outputs
[4835]	571	do j=1, knon
[4916]	572	! total flux is the erosion of fresh snow +
	573	! a fraction of the underlying snow (if all the fresh snow has been eroded)
	574	! the calculation of the fraction is quite delicate since we do not know
	575	! how much time was needed to erode the fresh snow. We assume that this time
	576	! is dtexp(-(abs(fluxbs1)-precipsnow)/precipsnow)=dtbsweight_fresh
	577
	578	fluxbs(j)=fluxbs_1(j)+fluxbs_2(j)*(1.-bsweight_fresh(j))
[4672]	579	i = knindex(j)
	580	zxustartlic(i) = ustart(j)
	581	zxrhoslic(i) = rhos(j)
[4835]	582	zxqsaltlic(i)=qsalt(j)
	583	enddo
[4523]	584
	585
[4916]	586	else ! not ok_bs
[4835]	587	! those lines are useful to calculate the snow age
	588	CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:))
[4523]	589
[4835]	590	endif ! if ok_bs
[4523]	591
[4835]	592
	593
[4523]	594	!****************************************************************************************
[4672]	595	! Calculate snow amount
[4523]	596	!
	597	!****************************************************************************************
	598	IF (ok_bs) THEN
[4526]	599	precip_totsnow(:)=precip_snow(:)+precip_bs(:)
	600	evap_totsnow(:)=evap(:)-fluxbs(:) ! flux bs is positive towards the surface (snow erosion)
[4523]	601	ELSE
[4526]	602	precip_totsnow(:)=precip_snow(:)
	603	evap_totsnow(:)=evap(:)
[4523]	604	ENDIF
[4672]	605
	606
[4523]	607	CALL fonte_neige(knon, is_lic, knindex, dtime, &
[5022]	608	tsurf, precip_rain, precip_totsnow, &
[5489]	609	snow, qsol, tsurf_new, evap_totsnow, icesub_lic &
[5022]	610	#ifdef ISO
	611	& ,fq_fonte_diag,fqfonte_diag,snow_evap_diag,fqcalving_diag &
	612	& ,max_eau_sol_diag,runoff_diag,run_off_lic_diag,coeff_rel_diag &
	613	#endif
	614	& )
	615
	616
	617	#ifdef ISO
	618	#ifdef ISOVERIF
	619	DO i=1,knon
	620	IF (iso_eau > 0) THEN
	621	CALL iso_verif_egalite_choix(Rland_ice(iso_eau,i),1.0, &
	622	& 'surf_landice_mod 217',errmax,errmaxrel)
	623	ENDIF !IF (iso_eau > 0) THEN
	624	ENDDO !DO i=1,knon
	625	#endif
	626
	627	CALL calcul_iso_surf_lic_vectall(klon,knon, &
	628	& evap,snow_evap_diag,Tsurf_new,snow, &
	629	& fq_fonte_diag,fqfonte_diag,dtime,t_coup, &
	630	& precip_snow,xtprecip_snow,precip_rain,xtprecip_rain, snow_prec,xtsnow_prec, &
	631	& xtspechum,spechum,ps,Rland_ice, &
	632	& xtevap,xtsnow,fqcalving_diag, &
	633	& knindex,is_lic,run_off_lic_diag,coeff_rel_diag &
	634	& )
	635
	636	! call fonte_neige_export_xtrun_off_lic_0(knon,xtrun_off_lic_0_diag)
	637
	638	#endif
[4672]	639
[4523]	640	WHERE (snow(1 : knon) .LT. 0.0001) agesno(1 : knon) = 0.
	641	zfra(1:knon) = MAX(0.0,MIN(1.0,snow(1:knon)/(snow(1:knon)+10.0)))
	642
	643
[3792]	644	END IF ! landice_opt
	645
	646
[781]	647	!****************************************************************************************
	648	! Send run-off on land-ice to coupler if coupled ocean.
[3903]	649	! run_off_lic has been calculated in fonte_neige or surf_inlandsis
[4283]	650	! If landice_opt>=2, corresponding call is done from surf_land_orchidee
[781]	651	!****************************************************************************************
[4283]	652	IF (type_ocean=='couple' .AND. landice_opt .LT. 2) THEN
	653	! Compress fraction where run_off_lic is active (here all pctsrf(is_lic))
	654	run_off_lic_frac(:)=0.0
	655	DO j = 1, knon
	656	i = knindex(j)
	657	run_off_lic_frac(j) = pctsrf(i,is_lic)
	658	ENDDO
	659
	660	CALL cpl_send_landice_fields(itime, knon, knindex, run_off_lic, run_off_lic_frac)
[781]	661	ENDIF
[1865]	662
	663	! transfer runoff rate [kg/m2/s](!) to physiq for output
	664	runoff(1:knon)=run_off_lic(1:knon)/dtime
	665
[1403]	666	snow_o=0.
	667	zfra_o = 0.
	668	DO j = 1, knon
	669	i = knindex(j)
	670	snow_o(i) = snow(j)
	671	zfra_o(i) = zfra(j)
	672	ENDDO
	673
	674
[2227]	675	!albedo SB >>>
	676	select case(NSW)
	677	case(2)
	678	alb_dir(1:knon,1)=alb1(1:knon)
	679	alb_dir(1:knon,2)=alb2(1:knon)
	680	case(4)
	681	alb_dir(1:knon,1)=alb1(1:knon)
	682	alb_dir(1:knon,2)=alb2(1:knon)
	683	alb_dir(1:knon,3)=alb2(1:knon)
	684	alb_dir(1:knon,4)=alb2(1:knon)
	685	case(6)
	686	alb_dir(1:knon,1)=alb1(1:knon)
	687	alb_dir(1:knon,2)=alb1(1:knon)
	688	alb_dir(1:knon,3)=alb1(1:knon)
	689	alb_dir(1:knon,4)=alb2(1:knon)
	690	alb_dir(1:knon,5)=alb2(1:knon)
	691	alb_dir(1:knon,6)=alb2(1:knon)
[3900]	692
[3901]	693	IF ((landice_opt .EQ. 1) .AND. (iflag_albcalc .EQ. 2)) THEN
[3900]	694	alb_dir(1:knon,1)=alb6(1:knon,1)
	695	alb_dir(1:knon,2)=alb6(1:knon,2)
	696	alb_dir(1:knon,3)=alb6(1:knon,3)
	697	alb_dir(1:knon,4)=alb6(1:knon,4)
	698	alb_dir(1:knon,5)=alb6(1:knon,5)
	699	alb_dir(1:knon,6)=alb6(1:knon,6)
	700	ENDIF
	701
[2227]	702	end select
	703	alb_dif=alb_dir
	704	!albedo SB <<<
	705
	706
[781]	707	END SUBROUTINE surf_landice
	708	!
	709	!****************************************************************************************
	710	!
	711	END MODULE surf_landice_mod
	712
	713
	714

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