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surf_landice_mod.F90 @ 5435

Last change on this file since 5435 was 5203, checked in by Laurent Fairhead, 3 months 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

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1	!
2	MODULE surf_landice_mod
3
4	IMPLICIT NONE
5
6	CONTAINS
7	!
8	!****************************************************************************************
9	!
10	SUBROUTINE surf_landice(itime, dtime, knon, knindex, &
11	rlon, rlat, debut, lafin, &
12	rmu0, lwdownm, albedo, pphi1, &
13	swnet, lwnet, tsurf, p1lay, &
14	cdragh, cdragm, precip_rain, precip_snow, precip_bs, temp_air, spechum, &
15	AcoefH, AcoefQ, BcoefH, BcoefQ, &
16	AcoefU, AcoefV, BcoefU, BcoefV, &
17	AcoefQBS, BcoefQBS, &
18	ps, u1, v1, gustiness, rugoro, pctsrf, &
19	snow, qsurf, qsol, qbs1, agesno, &
20	tsoil, z0m, z0h, SFRWL, alb_dir, alb_dif, evap, fluxsens, fluxlat, fluxbs, &
21	tsurf_new, dflux_s, dflux_l, &
22	alt, slope, cloudf, &
23	snowhgt, qsnow, to_ice, sissnow, &
24	alb3, runoff, &
25	flux_u1, flux_v1 &
26	#ifdef ISO
27	& ,xtprecip_rain, xtprecip_snow,xtspechum,Rland_ice &
28	& ,xtsnow,xtsol,xtevap &
29	#endif
30	& )
31
32	USE dimphy
33	USE geometry_mod, ONLY : longitude,latitude
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
36	USE cpl_mod, ONLY : cpl_send_landice_fields
37	USE calcul_fluxs_mod
38	USE phys_local_var_mod, ONLY : zxrhoslic, zxustartlic, zxqsaltlic, tempsmoothlic
39	USE phys_output_var_mod, ONLY : snow_o,zfra_o
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
50	!FC
51	USE ioipsl_getin_p_mod, ONLY : getin_p
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
54	#ifdef CPP_INLANDSIS
55	USE surf_inlandsis_mod, ONLY : surf_inlandsis
56	#endif
57
58	USE indice_sol_mod
59
60	! INCLUDE "indicesol.h"
61	INCLUDE "dimsoil.h"
62	INCLUDE "YOMCST.h"
63	INCLUDE "clesphys.h"
64
65	! Input variables
66	!****************************************************************************************
67	INTEGER, INTENT(IN) :: itime, knon
68	INTEGER, DIMENSION(klon), INTENT(in) :: knindex
69	REAL, INTENT(in) :: dtime
70	REAL, DIMENSION(klon), INTENT(IN) :: swnet ! net shortwave radiance
71	REAL, DIMENSION(klon), INTENT(IN) :: lwnet ! net longwave radiance
72	REAL, DIMENSION(klon), INTENT(IN) :: tsurf
73	REAL, DIMENSION(klon), INTENT(IN) :: p1lay
74	REAL, DIMENSION(klon), INTENT(IN) :: cdragh, cdragm
75	REAL, DIMENSION(klon), INTENT(IN) :: precip_rain, precip_snow, precip_bs
76	REAL, DIMENSION(klon), INTENT(IN) :: temp_air, spechum
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
80	REAL, DIMENSION(klon), INTENT(IN) :: AcoefQBS, BcoefQBS
81	REAL, DIMENSION(klon), INTENT(IN) :: ps
82	REAL, DIMENSION(klon), INTENT(IN) :: u1, v1, gustiness, qbs1
83	REAL, DIMENSION(klon), INTENT(IN) :: rugoro
84	REAL, DIMENSION(klon,nbsrf), INTENT(IN) :: pctsrf
85	#ifdef ISO
86	REAL, DIMENSION(ntiso,klon), INTENT(IN) :: xtprecip_rain, xtprecip_snow
87	REAL, DIMENSION(ntiso,klon), INTENT(IN) :: xtspechum
88	#endif
89
90
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
98	REAL, DIMENSION(klon), INTENT(IN) :: alt !mean altitude of the grid box
99	REAL, DIMENSION(klon), INTENT(IN) :: slope !mean slope in grid box
100	REAL, DIMENSION(klon), INTENT(IN) :: cloudf !total cloud fraction
101
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
107	#ifdef ISO
108	REAL, DIMENSION(niso,klon), INTENT(INOUT) :: xtsnow, xtsol
109	REAL, DIMENSION(niso,klon), INTENT(INOUT) :: Rland_ice
110	#endif
111
112
113	! Output variables
114	!****************************************************************************************
115	REAL, DIMENSION(klon), INTENT(OUT) :: qsurf
116	REAL, DIMENSION(klon), INTENT(OUT) :: z0m, z0h
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
120	REAL, DIMENSION(6), INTENT(IN) :: SFRWL
121	REAL, DIMENSION(klon,nsw), INTENT(OUT) :: alb_dir,alb_dif
122	!albedo SB <<<
123	REAL, DIMENSION(klon), INTENT(OUT) :: evap, fluxsens, fluxlat
124	REAL, DIMENSION(klon), INTENT(OUT) :: fluxbs
125	REAL, DIMENSION(klon), INTENT(OUT) :: tsurf_new
126	REAL, DIMENSION(klon), INTENT(OUT) :: dflux_s, dflux_l
127	REAL, DIMENSION(klon), INTENT(OUT) :: flux_u1, flux_v1
128
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
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
140
141
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
147	REAL, DIMENSION(klon) :: radsol
148	REAL, DIMENSION(klon) :: u0, v0, u1_lay, v1_lay, ustar
149	INTEGER :: i,j,nt
150	REAL, DIMENSION(klon) :: fqfonte,ffonte
151	REAL, DIMENSION(klon) :: run_off_lic_frac
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
169	REAL, DIMENSION(klon) :: emis_new !Emissivity
170	REAL, DIMENSION(klon) :: swdown,lwdown
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
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
178	REAL, DIMENSION(klon,nsoilmx) :: tsoil0 !modif
179	REAL :: dtis ! subtimestep
180	LOGICAL :: debut_is, lafin_is ! debut and lafin for inlandsis
181
182	CHARACTER (len = 20) :: modname = 'surf_landice'
183	CHARACTER (len = 80) :: abort_message
184
185
186	REAL,DIMENSION(klon) :: alb1,alb2
187	REAL :: time_tempsmooth,coef_tempsmooth
188	REAL,DIMENSION(klon) :: precip_totsnow, evap_totsnow
189	REAL, DIMENSION (klon,6) :: alb6
190	REAL :: esalt
191	REAL :: lambdasalt,fluxsalt, csalt, nunu, aa, bb, cc
192	REAL :: tau_dens, maxerosion
193	REAL, DIMENSION(klon) :: ws1, rhod, rhos, ustart0, ustart, qsalt, hsalt
194	REAL, DIMENSION(klon) :: fluxbs_1, fluxbs_2, bsweight_fresh
195	LOGICAL, DIMENSION(klon) :: ok_remaining_freshsnow
196	REAL :: ta1, ta2, ta3, z01, z02, z03, coefa, coefb, coefc, coefd
197
198
199	! End definition
200	!****************************************************************************************
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
211	!FC firtscall initializations
212	!******************************************************************************************
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
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
232
233	DO j=1,knon
234	i = knindex(j)
235	tempsmoothlic(i) = temp_air(j)
236	ENDDO
237	firstcall=.false.
238	ENDIF
239	!******************************************************************************************
240
241	! Initialize output variables
242	alb3(:) = 999999.
243	alb2(:) = 999999.
244	alb1(:) = 999999.
245	fluxbs(:)=0.
246	runoff(:) = 0.
247	!****************************************************************************************
248	! Calculate total absorbed radiance at surface
249	!
250	!****************************************************************************************
251	radsol(:) = 0.0
252	radsol(1:knon) = swnet(1:knon) + lwnet(1:knon)
253
254	!****************************************************************************************
255
256	!****************************************************************************************
257	! landice_opt = 0 : soil_model, calcul_flux, fonte_neige, ...
258	! landice_opt = 1 : prepare and call INterace Lmdz SISvat (INLANDSIS)
259	!****************************************************************************************
260
261
262	IF (landice_opt .EQ. 1) THEN
263
264	!****************************************************************************************
265	! CALL to INLANDSIS interface
266	!****************************************************************************************
267	#ifdef CPP_INLANDSIS
268
269	#ifdef ISO
270	CALL abort_gcm('surf_landice 235','isotopes pas dans INLANDSIS',1)
271	#endif
272
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
292	snow_cont_air(:) = 0. ! the snow content in air is not a prognostic variable of the model
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
310	dtis=dtime
311
312	IF (lafin) THEN
313	lafin_is=.true.
314	END IF
315
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, &
321	AcoefH, AcoefQ, BcoefH, BcoefQ, cdragm, cdragh, &
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)
325
326	debut_is=.false.
327
328
329	! Treatment of snow melting and calving
330
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
344	#else
345	abort_message='Pb de coherence: landice_opt = 1 mais CPP_INLANDSIS = .false.'
346	CALL abort_physic(modname,abort_message,1)
347	#endif
348
349
350	ELSE
351
352	!****************************************************************************************
353	! Soil calculations
354	!
355	!****************************************************************************************
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
362	IF (soil_model) THEN
363	CALL soil(dtime, is_lic, knon, snow, tsurf, qsol, &
364	& longitude(knindex(1:knon)), latitude(knindex(1:knon)), tsoil, soilcap, soilflux)
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	!****************************************************************************************
377	! beta(:) = 1.0
378	! dif_grnd(:) = 0.0
379
380	! Suppose zero surface speed
381	u0(:)=0.0
382	v0(:)=0.0
383	u1_lay(:) = u1(:) - u0(:)
384	v1_lay(:) = v1(:) - v0(:)
385
386	CALL calcul_fluxs(knon, is_lic, dtime, &
387	tsurf, p1lay, cal, beta, cdragh, cdragh, ps, &
388	precip_rain, precip_snow, snow, qsurf, &
389	radsol, dif_grnd, temp_air, spechum, u1_lay, v1_lay, gustiness, &
390	1.,AcoefH, AcoefQ, BcoefH, BcoefQ, &
391	tsurf_new, evap, fluxlat, fluxsens, dflux_s, dflux_l)
392
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
418	CALL calcul_flux_wind(knon, dtime, &
419	u0, v0, u1, v1, gustiness, cdragm, &
420	AcoefU, AcoefV, BcoefU, BcoefV, &
421	p1lay, temp_air, &
422	flux_u1, flux_v1)
423
424
425	!****************************************************************************************
426	! Calculate albedo
427	!
428	!****************************************************************************************
429
430	!
431	!IM: plusieurs choix/tests sur l'albedo des "glaciers continentaux"
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
436	!IM: KstaTER0.77 & LMD_ARMIP6
437
438	! Attantion: alb1 and alb2 are not the same!
439	alb1(1:knon) = alb_vis_sno_lic
440	alb2(1:knon) = alb_nir_sno_lic
441
442
443	!****************************************************************************************
444	! Rugosity
445	!
446	!****************************************************************************************
447
448	if (z0m_landice .GT. 0.) then
449	z0m(1:knon) = z0m_landice
450	z0h(1:knon) = z0h_landice
451	else
452	! parameterization of z0=f(T) following measurements in Adelie Land by Amory et al 2017
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
463	time_tempsmooth=2.*86400.
464	coef_tempsmooth=min(1.,dtime/time_tempsmooth)
465	!coef_tempsmooth=0.
466	do j=1,knon
467	i=knindex(j)
468	tempsmoothlic(i)=temp_air(j)coef_tempsmooth+tempsmoothlic(i)(1.-coef_tempsmooth)
469	if (tempsmoothlic(i) .lt. ta1) then
470	z0m(j) = z01
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
474	! if st > 0, melting induce smooth surface
475	z0m(j) = exp(coefc*tempsmoothlic(i) + coefd)
476	else
477	z0m(j) = z03
478	endif
479	z0h(j)=z0m(j)
480	enddo
481
482	endif
483
484
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
492
493
494	if (ok_bs) then
495	fluxbs(:)=0.
496	do j=1,knon
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
505	if (precip_snow(j) .GT. 0.) then
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
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
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
545	CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:)+fluxbs_1(:))
546
547	! 2nd step:
548	! computation of threshold friction velocity
549	! which depends on surface snow density
550	do j = 1, knon
551	if (ok_remaining_freshsnow(j)) then
552	fluxbs_2(j)=0.
553	else
554	! we start eroding the underlying layer
555	! estimation of snow density
556	! snow density increases with snow age and
557	! increases even faster in case of sedimentation of blowing snow or rain
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))
561	! blowing snow flux formula used in MAR
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)
566	esalt=1./(c_esalt_bs*max(1.e-6,ustar(j)))
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
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
580	enddo
581
582
583
584
585	! final flux and outputs
586	do j=1, knon
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))
594	i = knindex(j)
595	zxustartlic(i) = ustart(j)
596	zxrhoslic(i) = rhos(j)
597	zxqsaltlic(i)=qsalt(j)
598	enddo
599
600
601	else ! not ok_bs
602	! those lines are useful to calculate the snow age
603	CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:))
604
605	endif ! if ok_bs
606
607
608
609	!****************************************************************************************
610	! Calculate snow amount
611	!
612	!****************************************************************************************
613	IF (ok_bs) THEN
614	precip_totsnow(:)=precip_snow(:)+precip_bs(:)
615	evap_totsnow(:)=evap(:)-fluxbs(:) ! flux bs is positive towards the surface (snow erosion)
616	ELSE
617	precip_totsnow(:)=precip_snow(:)
618	evap_totsnow(:)=evap(:)
619	ENDIF
620
621
622	CALL fonte_neige(knon, is_lic, knindex, dtime, &
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
654
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
659	END IF ! landice_opt
660
661
662	!****************************************************************************************
663	! Send run-off on land-ice to coupler if coupled ocean.
664	! run_off_lic has been calculated in fonte_neige or surf_inlandsis
665	! If landice_opt>=2, corresponding call is done from surf_land_orchidee
666	!****************************************************************************************
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)
676	ENDIF
677
678	! transfer runoff rate [kg/m2/s](!) to physiq for output
679	runoff(1:knon)=run_off_lic(1:knon)/dtime
680
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
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)
707
708	IF ((landice_opt .EQ. 1) .AND. (iflag_albcalc .EQ. 2)) THEN
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
717	end select
718	alb_dif=alb_dir
719	!albedo SB <<<
720
721
722	END SUBROUTINE surf_landice
723	!
724	!****************************************************************************************
725	!
726	END MODULE surf_landice_mod
727
728
729

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