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surf_landice_mod.F90 @ 5022

Last change on this file since 5022 was 5022, checked in by Sebastien Nguyen, 2 months ago
include ISO keys in pbl_surface and associated routines in phylmd
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: 27.8 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, &
[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
[4835]	38	USE phys_local_var_mod, ONLY : zxrhoslic, zxustartlic, zxqsaltlic
[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
[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
[5022]	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
[5022]	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
[5022]	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
[5022]	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
[5022]	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
[5022]	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
[4523]	187	REAL,DIMENSION(klon) :: precip_totsnow, evap_totsnow
[3900]	188	REAL, DIMENSION (klon,6) :: alb6
[4835]	189	REAL :: esalt
[4529]	190	REAL :: lambdasalt,fluxsalt, csalt, nunu, aa, bb, cc
[4916]	191	REAL :: tau_dens, maxerosion
[4835]	192	REAL, DIMENSION(klon) :: ws1, rhod, rhos, ustart0, ustart, qsalt, hsalt
[4916]	193	REAL, DIMENSION(klon) :: fluxbs_1, fluxbs_2, bsweight_fresh
	194	LOGICAL, DIMENSION(klon) :: ok_remaining_freshsnow
[4947]	195	REAL :: ta1, ta2, ta3, z01, z02, z03, coefa, coefb, coefc, coefd
[4672]	196
[4947]	197
[781]	198	! End definition
	199	!****************************************************************************************
[2728]	200	!FC
	201	!FC
	202	REAL,SAVE :: alb_vis_sno_lic
	203	!$OMP THREADPRIVATE(alb_vis_sno_lic)
	204	REAL,SAVE :: alb_nir_sno_lic
	205	!$OMP THREADPRIVATE(alb_nir_sno_lic)
	206	LOGICAL, SAVE :: firstcall = .TRUE.
	207	!$OMP THREADPRIVATE(firstcall)
	208
	209
[3792]	210	!FC firtscall initializations
	211	!******************************************************************************************
[5022]	212	#ifdef ISO
	213	#ifdef ISOVERIF
	214	! write(,) 'surf_land_ice 1499'
	215	DO i=1,knon
	216	IF (iso_eau > 0) THEN
	217	CALL iso_verif_egalite_choix(xtsnow(iso_eau,i),snow(i), &
	218	& 'surf_land_ice 126',errmax,errmaxrel)
	219	ENDIF !IF (iso_eau > 0) THEN
	220	ENDDO !DO i=1,knon
	221	#endif
	222	#endif
	223
[2728]	224	IF (firstcall) THEN
	225	alb_vis_sno_lic=0.77
	226	CALL getin_p('alb_vis_sno_lic',alb_vis_sno_lic)
	227	PRINT*, 'alb_vis_sno_lic',alb_vis_sno_lic
	228	alb_nir_sno_lic=0.77
	229	CALL getin_p('alb_nir_sno_lic',alb_nir_sno_lic)
	230	PRINT*, 'alb_nir_sno_lic',alb_nir_sno_lic
[3792]	231
[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)
[1865]	254	!****************************************************************************************
[3792]	255
	256
	257	IF (landice_opt .EQ. 1) THEN
	258
[3901]	259	!****************************************************************************************
[3792]	260	! CALL to INLANDSIS interface
	261	!****************************************************************************************
	262	#ifdef CPP_INLANDSIS
	263
[5022]	264	#ifdef ISO
	265	CALL abort_gcm('surf_landice 235','isotopes pas dans INLANDSIS',1)
	266	#endif
	267
[3792]	268	debut_is=debut
	269	lafin_is=.false.
	270	! Suppose zero surface speed
	271	u0(:) = 0.0
	272	v0(:) = 0.0
	273
	274
	275	CALL calcul_flux_wind(knon, dtime, &
	276	u0, v0, u1, v1, gustiness, cdragm, &
	277	AcoefU, AcoefV, BcoefU, BcoefV, &
	278	p1lay, temp_air, &
	279	flux_u1, flux_v1)
	280
	281
	282	! Set constants and compute some input for SISVAT
	283	! = 1000 hPa
	284	! and calculate incoming flux for SW and LW interval: swdown, lwdown
	285	swdown(:) = 0.0
	286	lwdown(:) = 0.0
[3900]	287	snow_cont_air(:) = 0. ! the snow content in air is not a prognostic variable of the model
[3792]	288	alb_soil(:) = 0.4 ! before albedo(:) but here it is the ice albedo that we have to set
	289	ustar(:) = 0.
	290	pref = 100000.
	291	DO i = 1, knon
	292	swdown(i) = swnet(i)/(1-albedo(i))
	293	lwdown(i) = lwdownm(i)
	294	wind_velo(i) = u1(i)2 + v1(i)2
	295	wind_velo(i) = wind_velo(i)**0.5
	296	pexner(i) = (p1lay(i)/pref)**(RD/RCPD)
	297	dens_air(i) = p1lay(i)/RD/temp_air(i) ! dry air density
	298	zsl_height(i) = pphi1(i)/RG
	299	tsoil0(i,:) = tsoil(i,:)
	300	ustar(i)= (cdragm(i)(wind_velo(i)2))*0.5
	301	END DO
	302
	303
	304
[3900]	305	dtis=dtime
[3792]	306
[3900]	307	IF (lafin) THEN
[3792]	308	lafin_is=.true.
	309	END IF
	310
[3900]	311	CALL surf_inlandsis(knon, rlon, rlat, knindex, itime, dtis, debut_is, lafin_is,&
	312	rmu0, swdown, lwdown, albedo, pexner, ps, p1lay, precip_rain, precip_snow, &
	313	zsl_height, wind_velo, ustar, temp_air, dens_air, spechum, tsurf,&
	314	rugoro, snow_cont_air, alb_soil, alt, slope, cloudf, &
	315	radsol, qsol, tsoil0, snow, zfra, snowhgt, qsnow, to_ice, sissnow,agesno, &
[3792]	316	AcoefH, AcoefQ, BcoefH, BcoefQ, cdragm, cdragh, &
[3900]	317	run_off_lic, fqfonte, ffonte, evap, erod, fluxsens, fluxlat,dflux_s, dflux_l, &
	318	tsurf_new, alb1, alb2, alb3, alb6, &
	319	emis_new, z0m, z0h, qsurf)
[3792]	320
[3900]	321	debut_is=.false.
[3792]	322
	323
[3900]	324	! Treatment of snow melting and calving
[3792]	325
[3900]	326	! for consistency with standard LMDZ, add calving to run_off_lic
	327	run_off_lic(:)=run_off_lic(:) + to_ice(:)
	328
	329	DO i = 1, knon
	330	ffonte_global(knindex(i),is_lic) = ffonte(i)
	331	fqfonte_global(knindex(i),is_lic) = fqfonte(i)! net melting= melting - refreezing
	332	fqcalving_global(knindex(i),is_lic) = to_ice(i) ! flux
	333	runofflic_global(knindex(i)) = run_off_lic(i)
	334	ENDDO
	335	! Here, we assume that the calving term is equal to the to_ice term
	336	! (no ice accumulation)
	337
	338
[3792]	339	#else
[3901]	340	abort_message='Pb de coherence: landice_opt = 1 mais CPP_INLANDSIS = .false.'
[3792]	341	CALL abort_physic(modname,abort_message,1)
	342	#endif
	343
	344
	345	ELSE
	346
	347	!****************************************************************************************
[781]	348	! Soil calculations
	349	!
	350	!****************************************************************************************
[3780]	351
	352	! EV: use calbeta
	353	CALL calbeta(dtime, is_lic, knon, snow, qsol, beta, cal, dif_grnd)
	354
	355
	356	! use soil model and recalculate properly cal
[781]	357	IF (soil_model) THEN
[3974]	358	CALL soil(dtime, is_lic, knon, snow, tsurf, qsol, &
	359	& longitude(knindex(1:knon)), latitude(knindex(1:knon)), tsoil, soilcap, soilflux)
[781]	360	cal(1:knon) = RCPD / soilcap(1:knon)
	361	radsol(1:knon) = radsol(1:knon) + soilflux(1:knon)
	362	ELSE
	363	cal = RCPD * calice
	364	WHERE (snow > 0.0) cal = RCPD * calsno
	365	ENDIF
	366
	367
	368	!****************************************************************************************
	369	! Calulate fluxes
	370	!
	371	!****************************************************************************************
[3792]	372	! beta(:) = 1.0
	373	! dif_grnd(:) = 0.0
[781]	374
[1067]	375	! Suppose zero surface speed
	376	u0(:)=0.0
	377	v0(:)=0.0
	378	u1_lay(:) = u1(:) - u0(:)
	379	v1_lay(:) = v1(:) - v0(:)
	380
[781]	381	CALL calcul_fluxs(knon, is_lic, dtime, &
[2254]	382	tsurf, p1lay, cal, beta, cdragh, cdragh, ps, &
[781]	383	precip_rain, precip_snow, snow, qsurf, &
[2240]	384	radsol, dif_grnd, temp_air, spechum, u1_lay, v1_lay, gustiness, &
[2254]	385	1.,AcoefH, AcoefQ, BcoefH, BcoefQ, &
[781]	386	tsurf_new, evap, fluxlat, fluxsens, dflux_s, dflux_l)
	387
[5022]	388	#ifdef ISO
	389	#ifdef ISOVERIF
	390	!write(,) 'surf_land_ice 1499'
	391	DO i=1,knon
	392	IF (iso_eau > 0) THEN
	393	IF (snow(i) > ridicule) THEN
	394	CALL iso_verif_egalite_choix(xtsnow(iso_eau,i),snow(i), &
	395	& 'surf_land_ice 1151',errmax,errmaxrel)
	396	ENDIF !IF ((snow(i) > ridicule)) THEN
	397	ENDIF !IF (iso_eau > 0) THEN
	398	ENDDO !DO i=1,knon
	399	#endif
	400
	401	DO i=1,knon
	402	snow_prec(i)=snow(i)
	403	DO ixt=1,niso
	404	xtsnow_prec(ixt,i)=xtsnow(ixt,i)
	405	ENDDO !DO ixt=1,niso
	406	! initialisation:
	407	fq_fonte_diag(i)=0.0
	408	fqfonte_diag(i)=0.0
	409	snow_evap_diag(i)=0.0
	410	ENDDO !DO i=1,knon
	411	#endif
	412
[1067]	413	CALL calcul_flux_wind(knon, dtime, &
[2240]	414	u0, v0, u1, v1, gustiness, cdragm, &
[1067]	415	AcoefU, AcoefV, BcoefU, BcoefV, &
	416	p1lay, temp_air, &
	417	flux_u1, flux_v1)
[781]	418
	419
	420	!****************************************************************************************
	421	! Calculate albedo
	422	!
	423	!****************************************************************************************
[3780]	424
[781]	425	!
	426	!IM: plusieurs choix/tests sur l'albedo des "glaciers continentaux"
[888]	427	! alb1(1 : knon) = 0.6 !IM cf FH/GK
	428	! alb1(1 : knon) = 0.82
	429	! alb1(1 : knon) = 0.77 !211003 Ksta0.77
	430	! alb1(1 : knon) = 0.8 !KstaTER0.8 & LMD_ARMIP5
[781]	431	!IM: KstaTER0.77 & LMD_ARMIP6
	432
[3780]	433	! Attantion: alb1 and alb2 are not the same!
[2728]	434	alb1(1:knon) = alb_vis_sno_lic
	435	alb2(1:knon) = alb_nir_sno_lic
[781]	436
	437
	438	!****************************************************************************************
	439	! Rugosity
	440	!
	441	!****************************************************************************************
[2243]	442
[4947]	443	if (z0m_landice .GT. 0.) then
	444	z0m(1:knon) = z0m_landice
	445	z0h(1:knon) = z0h_landice
	446	else
	447	! parameterization of z0=f(T) following measurements in Adelie Land by Amory et al 2018
	448	coefa = 0.1658 !0.1862 !Ant
	449	coefb = -50.3869 !-55.7718 !Ant
	450	ta1 = 253.15 !255. Ant
	451	ta2 = 273.15
	452	ta3 = 273.15+3
	453	z01 = exp(coefa*ta1 + coefb) !~0.2 ! ~0.25 mm
	454	z02 = exp(coefa*ta2 + coefb) !~6 !~7 mm
	455	z03 = z01
	456	coefc = log(z03/z02)/(ta3-ta2)
	457	coefd = log(z03)-coefc*ta3
	458	do j=1,knon
	459	if (temp_air(j) .lt. ta1) then
	460	z0m(j) = z01
	461	else if (temp_air(j).ge.ta1 .and. temp_air(j).lt.ta2) then
	462	z0m(j) = exp(coefa*temp_air(j) + coefb)
	463	else if (temp_air(j).ge.ta2 .and. temp_air(j).lt.ta3) then
	464	! if st > 0, melting induce smooth surface
	465	z0m(j) = exp(coefc*temp_air(j) + coefd)
	466	else
	467	z0m(j) = z03
	468	endif
	469	z0h(j)=z0m(j)
	470	enddo
[781]	471
[4947]	472	endif
	473
	474
[4835]	475	!****************************************************************************************
	476	! Simple blowing snow param
	477	!****************************************************************************************
	478	! we proceed in 2 steps:
	479	! first we erode - if possible -the accumulated snow during the time step
	480	! then we update the density of the underlying layer and see if we can also erode
	481	! this layer
[1865]	482
[4529]	483
[4835]	484	if (ok_bs) then
	485	fluxbs(:)=0.
[4947]	486	do j=1,knon
[4835]	487	ws1(j)=(u1(j)2+v1(j)2)**0.5
	488	ustar(j)=(cdragm(j)(u1(j)2+v1(j)2))*0.5
	489	rhod(j)=p1lay(j)/RD/temp_air(j)
	490	ustart0(j) =(log(2.868)-log(1.625))/0.085*sqrt(cdragm(j))
	491	enddo
	492
	493	! 1st step: erosion of fresh snow accumulated during the time step
	494	do j=1, knon
[4916]	495	if (precip_snow(j) .GT. 0.) then
[4835]	496	rhos(j)=rhofresh_bs
	497	! blowing snow flux formula used in MAR
	498	ustart(j)=ustart0(j)exp(max(rhoice_bs/rhofresh_bs-rhoice_bs/rhos(j),0.))exp(max(0.,rhos(j)-rhohard_bs))
	499	! we have multiplied by exp to prevent erosion when rhos>rhohard_bs
	500	! computation of qbs at the top of the saltation layer
	501	! default formulation from MAR model (Amory et al. 2021, Gallee et al. 2001)
	502	esalt=1./(c_esalt_bs*max(1.e-6,ustar(j)))
	503	hsalt(j)=0.08436(max(1.e-6,ustar(j))*1.27)
	504	qsalt(j)=(max(ustar(j)2-ustart(j)2,0.))/(RGhsalt(j))esalt
	505	! calculation of erosion (flux positive towards the surface here)
	506	! consistent with implicit resolution of turbulent mixing equation
	507	! Nemoto and Nishimura 2004 show that steady-state saltation is achieved within a time tau_eqsalt_bs of about 10s
	508	! we thus prevent snowerosion (snow particle transfer from the saltation layer to the first model level)
	509	! integrated over tau_eqsalt_bs to exceed the total mass of snow particle in the saltation layer
	510	! (rhoqsalthsalt)
	511	! during this first step we also lower bound the erosion to the amount of fresh snow accumulated during the time step
	512	maxerosion=min(precip_snow(j),hsalt(j)qsalt(j)rhod(j)/tau_eqsalt_bs)
	513
[4916]	514	fluxbs_1(j)=rhod(j)ws1(j)cdragh(j)zeta_bs(AcoefQBS(j)-qsalt(j)) &
	515	/ (1.-rhod(j)ws1(j)cdragh(j)zeta_bsBcoefQBS(j)*dtime)
	516	fluxbs_1(j)=max(-maxerosion,fluxbs_1(j))
	517
	518	if (precip_snow(j) .gt. abs(fluxbs_1(j))) then
	519	ok_remaining_freshsnow(j)=.true.
	520	bsweight_fresh(j)=1.
	521	else
	522	ok_remaining_freshsnow(j)=.false.
	523	bsweight_fresh(j)=exp(-(abs(fluxbs_1(j))-precip_snow(j))/precip_snow(j))
	524	endif
	525	else
	526	ok_remaining_freshsnow(j)=.false.
	527	fluxbs_1(j)=0.
	528	bsweight_fresh(j)=0.
	529	endif
[4835]	530	enddo
	531
	532
	533	! we now compute the snow age of the overlying layer (snow surface after erosion of the fresh snow accumulated during the time step)
	534	! this is done through the routine albsno
[4916]	535	CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:)+fluxbs_1(:))
[4835]	536
	537	! 2nd step:
[4529]	538	! computation of threshold friction velocity
	539	! which depends on surface snow density
[4672]	540	do j = 1, knon
[4916]	541	if (ok_remaining_freshsnow(j)) then
	542	fluxbs_2(j)=0.
	543	else
	544	! we start eroding the underlying layer
[4523]	545	! estimation of snow density
	546	! snow density increases with snow age and
[4672]	547	! increases even faster in case of sedimentation of blowing snow or rain
[4835]	548	tau_dens=max(tau_densmin_bs, tau_dens0_bs*exp(-abs(precip_bs(j))/pbst_bs - &
	549	abs(precip_rain(j))/prt_bs)*exp(-max(tsurf(j)-RTT,0.)))
	550	rhos(j)=rhofresh_bs+(rhohard_bs-rhofresh_bs)(1.-exp(-agesno(j)86400.0/tau_dens))
[4523]	551	! blowing snow flux formula used in MAR
[4835]	552	ustart(j)=ustart0(j)exp(max(rhoice_bs/rhofresh_bs-rhoice_bs/rhos(j),0.))exp(max(0.,rhos(j)-rhohard_bs))
	553	! we have multiplied by exp to prevent erosion when rhos>rhohard_bs
	554	! computation of qbs at the top of the saltation layer
	555	! default formulation from MAR model (Amory et al. 2021, Gallee et al. 2001)
[4916]	556	esalt=1./(c_esalt_bs*max(1.e-6,ustar(j)))
[4835]	557	hsalt(j)=0.08436(max(1.e-6,ustar(j))*1.27)
	558	qsalt(j)=(max(ustar(j)2-ustart(j)2,0.))/(RGhsalt(j))esalt
	559	! calculation of erosion (flux positive towards the surface here)
	560	! consistent with implicit resolution of turbulent mixing equation
	561	! Nemoto and Nishimura 2004 show that steady-state saltation is achieved within a time tau_eqsalt_bs of about 10s
	562	! we thus prevent snowerosion (snow particle transfer from the saltation layer to the first model level)
	563	! integrated over tau_eqsalt_bs to exceed the total mass of snow particle in the saltation layer
	564	! (rhoqsalthsalt)
	565	maxerosion=hsalt(j)qsalt(j)rhod(j)/tau_eqsalt_bs
[4916]	566	fluxbs_2(j)=rhod(j)ws1(j)cdragh(j)zeta_bs(AcoefQBS(j)-qsalt(j)) &
	567	/ (1.-rhod(j)ws1(j)cdragh(j)zeta_bsBcoefQBS(j)*dtime)
	568	fluxbs_2(j)=max(-maxerosion,fluxbs_2(j))
	569	endif
[4523]	570	enddo
	571
[4916]	572
	573
	574
	575	! final flux and outputs
[4835]	576	do j=1, knon
[4916]	577	! total flux is the erosion of fresh snow +
	578	! a fraction of the underlying snow (if all the fresh snow has been eroded)
	579	! the calculation of the fraction is quite delicate since we do not know
	580	! how much time was needed to erode the fresh snow. We assume that this time
	581	! is dtexp(-(abs(fluxbs1)-precipsnow)/precipsnow)=dtbsweight_fresh
	582
	583	fluxbs(j)=fluxbs_1(j)+fluxbs_2(j)*(1.-bsweight_fresh(j))
[4672]	584	i = knindex(j)
	585	zxustartlic(i) = ustart(j)
	586	zxrhoslic(i) = rhos(j)
[4835]	587	zxqsaltlic(i)=qsalt(j)
	588	enddo
[4523]	589
	590
[4916]	591	else ! not ok_bs
[4835]	592	! those lines are useful to calculate the snow age
	593	CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:))
[4523]	594
[4835]	595	endif ! if ok_bs
[4523]	596
[4835]	597
	598
[4523]	599	!****************************************************************************************
[4672]	600	! Calculate snow amount
[4523]	601	!
	602	!****************************************************************************************
	603	IF (ok_bs) THEN
[4526]	604	precip_totsnow(:)=precip_snow(:)+precip_bs(:)
	605	evap_totsnow(:)=evap(:)-fluxbs(:) ! flux bs is positive towards the surface (snow erosion)
[4523]	606	ELSE
[4526]	607	precip_totsnow(:)=precip_snow(:)
	608	evap_totsnow(:)=evap(:)
[4523]	609	ENDIF
[4672]	610
	611
[4523]	612	CALL fonte_neige(knon, is_lic, knindex, dtime, &
[5022]	613	tsurf, precip_rain, precip_totsnow, &
	614	snow, qsol, tsurf_new, evap_totsnow &
	615	#ifdef ISO
	616	& ,fq_fonte_diag,fqfonte_diag,snow_evap_diag,fqcalving_diag &
	617	& ,max_eau_sol_diag,runoff_diag,run_off_lic_diag,coeff_rel_diag &
	618	#endif
	619	& )
	620
	621
	622	#ifdef ISO
	623	#ifdef ISOVERIF
	624	DO i=1,knon
	625	IF (iso_eau > 0) THEN
	626	CALL iso_verif_egalite_choix(Rland_ice(iso_eau,i),1.0, &
	627	& 'surf_landice_mod 217',errmax,errmaxrel)
	628	ENDIF !IF (iso_eau > 0) THEN
	629	ENDDO !DO i=1,knon
	630	#endif
	631
	632	CALL calcul_iso_surf_lic_vectall(klon,knon, &
	633	& evap,snow_evap_diag,Tsurf_new,snow, &
	634	& fq_fonte_diag,fqfonte_diag,dtime,t_coup, &
	635	& precip_snow,xtprecip_snow,precip_rain,xtprecip_rain, snow_prec,xtsnow_prec, &
	636	& xtspechum,spechum,ps,Rland_ice, &
	637	& xtevap,xtsnow,fqcalving_diag, &
	638	& knindex,is_lic,run_off_lic_diag,coeff_rel_diag &
	639	& )
	640
	641	! call fonte_neige_export_xtrun_off_lic_0(knon,xtrun_off_lic_0_diag)
	642
	643	#endif
[4672]	644
[4523]	645	WHERE (snow(1 : knon) .LT. 0.0001) agesno(1 : knon) = 0.
	646	zfra(1:knon) = MAX(0.0,MIN(1.0,snow(1:knon)/(snow(1:knon)+10.0)))
	647
	648
[3792]	649	END IF ! landice_opt
	650
	651
[781]	652	!****************************************************************************************
	653	! Send run-off on land-ice to coupler if coupled ocean.
[3903]	654	! run_off_lic has been calculated in fonte_neige or surf_inlandsis
[4283]	655	! If landice_opt>=2, corresponding call is done from surf_land_orchidee
[781]	656	!****************************************************************************************
[4283]	657	IF (type_ocean=='couple' .AND. landice_opt .LT. 2) THEN
	658	! Compress fraction where run_off_lic is active (here all pctsrf(is_lic))
	659	run_off_lic_frac(:)=0.0
	660	DO j = 1, knon
	661	i = knindex(j)
	662	run_off_lic_frac(j) = pctsrf(i,is_lic)
	663	ENDDO
	664
	665	CALL cpl_send_landice_fields(itime, knon, knindex, run_off_lic, run_off_lic_frac)
[781]	666	ENDIF
[1865]	667
	668	! transfer runoff rate [kg/m2/s](!) to physiq for output
	669	runoff(1:knon)=run_off_lic(1:knon)/dtime
	670
[1403]	671	snow_o=0.
	672	zfra_o = 0.
	673	DO j = 1, knon
	674	i = knindex(j)
	675	snow_o(i) = snow(j)
	676	zfra_o(i) = zfra(j)
	677	ENDDO
	678
	679
[2227]	680	!albedo SB >>>
	681	select case(NSW)
	682	case(2)
	683	alb_dir(1:knon,1)=alb1(1:knon)
	684	alb_dir(1:knon,2)=alb2(1:knon)
	685	case(4)
	686	alb_dir(1:knon,1)=alb1(1:knon)
	687	alb_dir(1:knon,2)=alb2(1:knon)
	688	alb_dir(1:knon,3)=alb2(1:knon)
	689	alb_dir(1:knon,4)=alb2(1:knon)
	690	case(6)
	691	alb_dir(1:knon,1)=alb1(1:knon)
	692	alb_dir(1:knon,2)=alb1(1:knon)
	693	alb_dir(1:knon,3)=alb1(1:knon)
	694	alb_dir(1:knon,4)=alb2(1:knon)
	695	alb_dir(1:knon,5)=alb2(1:knon)
	696	alb_dir(1:knon,6)=alb2(1:knon)
[3900]	697
[3901]	698	IF ((landice_opt .EQ. 1) .AND. (iflag_albcalc .EQ. 2)) THEN
[3900]	699	alb_dir(1:knon,1)=alb6(1:knon,1)
	700	alb_dir(1:knon,2)=alb6(1:knon,2)
	701	alb_dir(1:knon,3)=alb6(1:knon,3)
	702	alb_dir(1:knon,4)=alb6(1:knon,4)
	703	alb_dir(1:knon,5)=alb6(1:knon,5)
	704	alb_dir(1:knon,6)=alb6(1:knon,6)
	705	ENDIF
	706
[2227]	707	end select
	708	alb_dif=alb_dir
	709	!albedo SB <<<
	710
	711
[781]	712	END SUBROUTINE surf_landice
	713	!
	714	!****************************************************************************************
	715	!
	716	END MODULE surf_landice_mod
	717
	718
	719

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