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surf_landice_mod.F90 @ 5779

Last change on this file since 5779 was 5618, checked in by aborella, 7 months ago
Merge with trunk testing r5597. We have convergence in prod and debug in NPv7.0.1c
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

Line
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, icesub_lic, 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	USE clesphys_mod_h
51	USE yomcst_mod_h
52	USE ioipsl_getin_p_mod, ONLY : getin_p
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
55	USE surf_inlandsis_mod, ONLY : surf_inlandsis
56
57	USE indice_sol_mod
58	USE lmdz_cppkeys_wrapper, ONLY: CPPKEY_INLANDSIS
59	USE dimsoil_mod_h, ONLY: nsoilmx
60
61
62
63	! Input variables
64	!****************************************************************************************
65	INTEGER, INTENT(IN) :: itime, knon
66	INTEGER, DIMENSION(klon), INTENT(in) :: knindex
67	REAL, INTENT(in) :: dtime
68	REAL, DIMENSION(klon), INTENT(IN) :: swnet ! net shortwave radiance
69	REAL, DIMENSION(klon), INTENT(IN) :: lwnet ! net longwave radiance
70	REAL, DIMENSION(klon), INTENT(IN) :: tsurf
71	REAL, DIMENSION(klon), INTENT(IN) :: p1lay
72	REAL, DIMENSION(klon), INTENT(IN) :: cdragh, cdragm
73	REAL, DIMENSION(klon), INTENT(IN) :: precip_rain, precip_snow, precip_bs
74	REAL, DIMENSION(klon), INTENT(IN) :: temp_air, spechum
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
78	REAL, DIMENSION(klon), INTENT(IN) :: AcoefQBS, BcoefQBS
79	REAL, DIMENSION(klon), INTENT(IN) :: ps
80	REAL, DIMENSION(klon), INTENT(IN) :: u1, v1, gustiness, qbs1
81	REAL, DIMENSION(klon), INTENT(IN) :: rugoro
82	REAL, DIMENSION(klon,nbsrf), INTENT(IN) :: pctsrf
83	#ifdef ISO
84	REAL, DIMENSION(ntiso,klon), INTENT(IN) :: xtprecip_rain, xtprecip_snow
85	REAL, DIMENSION(ntiso,klon), INTENT(IN) :: xtspechum
86	#endif
87
88
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
96	REAL, DIMENSION(klon), INTENT(IN) :: alt !mean altitude of the grid box
97	REAL, DIMENSION(klon), INTENT(IN) :: slope !mean slope in grid box
98	REAL, DIMENSION(klon), INTENT(IN) :: cloudf !total cloud fraction
99
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
105	#ifdef ISO
106	REAL, DIMENSION(niso,klon), INTENT(INOUT) :: xtsnow, xtsol
107	REAL, DIMENSION(niso,klon), INTENT(INOUT) :: Rland_ice
108	#endif
109
110
111	! Output variables
112	!****************************************************************************************
113	REAL, DIMENSION(klon), INTENT(OUT) :: qsurf
114	REAL, DIMENSION(klon), INTENT(OUT) :: z0m, z0h
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
118	REAL, DIMENSION(6), INTENT(IN) :: SFRWL
119	REAL, DIMENSION(klon,nsw), INTENT(OUT) :: alb_dir,alb_dif
120	!albedo SB <<<
121	REAL, DIMENSION(klon), INTENT(OUT) :: evap, fluxsens, fluxlat, icesub_lic
122	REAL, DIMENSION(klon), INTENT(OUT) :: fluxbs
123	REAL, DIMENSION(klon), INTENT(OUT) :: tsurf_new
124	REAL, DIMENSION(klon), INTENT(OUT) :: dflux_s, dflux_l
125	REAL, DIMENSION(klon), INTENT(OUT) :: flux_u1, flux_v1
126
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
133	#ifdef ISO
134	REAL, DIMENSION(ntiso,klon), INTENT(OUT) :: xtevap
135	#endif
136
137
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
143	REAL, DIMENSION(klon) :: radsol
144	REAL, DIMENSION(klon) :: u0, v0, u1_lay, v1_lay, ustar
145	INTEGER :: i,j,nt
146	REAL, DIMENSION(klon) :: fqfonte,ffonte
147	REAL, DIMENSION(klon) :: run_off_lic_frac
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
164	REAL, DIMENSION(klon) :: emis_new !Emissivity
165	REAL, DIMENSION(klon) :: swdown,lwdown
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
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
173	REAL, DIMENSION(klon,nsoilmx) :: tsoil0 !modif
174	REAL :: dtis ! subtimestep
175	LOGICAL :: debut_is, lafin_is ! debut and lafin for inlandsis
176
177	CHARACTER (len = 20) :: modname = 'surf_landice'
178	CHARACTER (len = 80) :: abort_message
179
180
181	REAL,DIMENSION(klon) :: alb1,alb2
182	REAL :: time_tempsmooth,coef_tempsmooth
183	REAL,DIMENSION(klon) :: precip_totsnow, evap_totsnow
184	REAL, DIMENSION (klon,6) :: alb6
185	REAL :: esalt
186	REAL :: lambdasalt,fluxsalt, csalt, nunu, aa, bb, cc
187	REAL :: tau_dens, maxerosion
188	REAL, DIMENSION(klon) :: ws1, rhod, rhos, ustart0, ustart, qsalt, hsalt
189	REAL, DIMENSION(klon) :: fluxbs_1, fluxbs_2, bsweight_fresh
190	LOGICAL, DIMENSION(klon) :: ok_remaining_freshsnow
191	REAL :: ta1, ta2, ta3, z01, z02, z03, coefa, coefb, coefc, coefd
192
193
194	! End definition
195	!****************************************************************************************
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
206	!FC firtscall initializations
207	!******************************************************************************************
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
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
227
228	DO j=1,knon
229	i = knindex(j)
230	tempsmoothlic(i) = temp_air(j)
231	ENDDO
232	firstcall=.false.
233	ENDIF
234	!******************************************************************************************
235
236	! Initialize output variables
237	alb3(:) = 999999.
238	alb2(:) = 999999.
239	alb1(:) = 999999.
240	fluxbs(:)=0.
241	runoff(:) = 0.
242	!****************************************************************************************
243	! Calculate total absorbed radiance at surface
244	!
245	!****************************************************************************************
246	radsol(:) = 0.0
247	radsol(1:knon) = swnet(1:knon) + lwnet(1:knon)
248
249	!****************************************************************************************
250
251	!****************************************************************************************
252	! landice_opt = 0 : soil_model, calcul_flux, fonte_neige, ...
253	! landice_opt = 1 : prepare and call INterace Lmdz SISvat (INLANDSIS)
254	! landice_opt = 2 : skip surf_landice and use orchidee over all land surfaces
255	!****************************************************************************************
256
257
258	IF (landice_opt .EQ. 1) THEN
259
260	!****************************************************************************************
261	! CALL to INLANDSIS interface
262	!****************************************************************************************
263	IF (CPPKEY_INLANDSIS) THEN
264
265	#ifdef ISO
266	CALL abort_physic('surf_landice 235','isotopes pas dans INLANDSIS',1)
267	#endif
268
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
288	snow_cont_air(:) = 0. ! the snow content in air is not a prognostic variable of the model
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
306	dtis=dtime
307
308	IF (lafin) THEN
309	lafin_is=.true.
310	END IF
311
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, &
317	AcoefH, AcoefQ, BcoefH, BcoefQ, cdragm, cdragh, &
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)
321
322	debut_is=.false.
323
324
325	! Treatment of snow melting and calving
326
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
340	ELSE
341	abort_message='Pb de coherence: landice_opt = 1 mais CPP_INLANDSIS = .false.'
342	CALL abort_physic(modname,abort_message,1)
343	END IF
344
345
346	ELSE
347
348	!****************************************************************************************
349	! Soil calculations
350	!
351	!****************************************************************************************
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
358	IF (soil_model) THEN
359	CALL soil(dtime, is_lic, knon, snow, tsurf, qsol, &
360	& longitude(knindex(1:knon)), latitude(knindex(1:knon)), tsoil, soilcap, soilflux)
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
374	! Suppose zero surface speed
375	u0(:)=0.0
376	v0(:)=0.0
377	u1_lay(:) = u1(:) - u0(:)
378	v1_lay(:) = v1(:) - v0(:)
379
380	CALL calcul_fluxs(knon, is_lic, dtime, &
381	tsurf, p1lay, cal, beta, cdragh, cdragh, ps, &
382	precip_rain, precip_snow, snow, qsurf, &
383	radsol, dif_grnd, temp_air, spechum, u1_lay, v1_lay, gustiness, &
384	1.,AcoefH, AcoefQ, BcoefH, BcoefQ, &
385	tsurf_new, evap, fluxlat, fluxsens, dflux_s, dflux_l)
386
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
411	CALL calcul_flux_wind(knon, dtime, &
412	u0, v0, u1, v1, gustiness, cdragm, &
413	AcoefU, AcoefV, BcoefU, BcoefV, &
414	p1lay, temp_air, &
415	flux_u1, flux_v1)
416
417
418	!****************************************************************************************
419	! Calculate albedo
420	!
421	!****************************************************************************************
422
423	! Attantion: alb1 and alb2 are not the same!
424	alb1(1:knon) = alb_vis_sno_lic
425	alb2(1:knon) = alb_nir_sno_lic
426
427
428	!****************************************************************************************
429	! Rugosity
430	!
431	!****************************************************************************************
432
433	if (z0m_landice .GT. 0.) then
434	z0m(1:knon) = z0m_landice
435	z0h(1:knon) = z0m_landice*ratio_z0hz0m_landice
436	else
437	! parameterization of z0=f(T) following measurements in Adelie Land by Amory et al 2017
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
448	time_tempsmooth=2.*86400.
449	coef_tempsmooth=min(1.,dtime/time_tempsmooth)
450	!coef_tempsmooth=0.
451	do j=1,knon
452	i=knindex(j)
453	tempsmoothlic(i)=temp_air(j)coef_tempsmooth+tempsmoothlic(i)(1.-coef_tempsmooth)
454	if (tempsmoothlic(i) .lt. ta1) then
455	z0m(j) = z01
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
459	! if st > 0, melting induce smooth surface
460	z0m(j) = exp(coefc*tempsmoothlic(i) + coefd)
461	else
462	z0m(j) = z03
463	endif
464	z0h(j)=z0m(j)
465	enddo
466
467	endif
468
469
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
477
478
479	if (ok_bs) then
480	fluxbs(:)=0.
481	do j=1,knon
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
490	if (precip_snow(j) .GT. 0.) then
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
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
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
530	CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:)+fluxbs_1(:))
531
532	! 2nd step:
533	! computation of threshold friction velocity
534	! which depends on surface snow density
535	do j = 1, knon
536	if (ok_remaining_freshsnow(j)) then
537	fluxbs_2(j)=0.
538	else
539	! we start eroding the underlying layer
540	! estimation of snow density
541	! snow density increases with snow age and
542	! increases even faster in case of sedimentation of blowing snow or rain
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))
546	! blowing snow flux formula used in MAR
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)
551	esalt=1./(c_esalt_bs*max(1.e-6,ustar(j)))
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
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
565	enddo
566
567
568
569
570	! final flux and outputs
571	do j=1, knon
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))
579	i = knindex(j)
580	zxustartlic(i) = ustart(j)
581	zxrhoslic(i) = rhos(j)
582	zxqsaltlic(i)=qsalt(j)
583	enddo
584
585
586	else ! not ok_bs
587	! those lines are useful to calculate the snow age
588	CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:))
589
590	endif ! if ok_bs
591
592
593
594	!****************************************************************************************
595	! Calculate snow amount
596	!
597	!****************************************************************************************
598	IF (ok_bs) THEN
599	precip_totsnow(:)=precip_snow(:)+precip_bs(:)
600	evap_totsnow(:)=evap(:)-fluxbs(:) ! flux bs is positive towards the surface (snow erosion)
601	ELSE
602	precip_totsnow(:)=precip_snow(:)
603	evap_totsnow(:)=evap(:)
604	ENDIF
605
606
607	CALL fonte_neige(knon, is_lic, knindex, dtime, &
608	tsurf, precip_rain, precip_totsnow, &
609	snow, qsol, tsurf_new, evap_totsnow, icesub_lic &
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
639
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
644	END IF ! landice_opt
645
646
647	!****************************************************************************************
648	! Send run-off on land-ice to coupler if coupled ocean.
649	! run_off_lic has been calculated in fonte_neige or surf_inlandsis
650	! If landice_opt>=2, corresponding call is done from surf_land_orchidee
651	!****************************************************************************************
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)
661	ENDIF
662
663	! transfer runoff rate [kg/m2/s](!) to physiq for output
664	runoff(1:knon)=run_off_lic(1:knon)/dtime
665
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
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)
692
693	IF ((landice_opt .EQ. 1) .AND. (iflag_albcalc .EQ. 2)) THEN
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
702	end select
703	alb_dif=alb_dir
704	!albedo SB <<<
705
706
707	END SUBROUTINE surf_landice
708	!
709	!****************************************************************************************
710	!
711	END MODULE surf_landice_mod
712
713
714

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