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surf_landice_mod.F90 @ 5099

Last change on this file since 5099 was 5099, checked in by abarral, 4 months ago
Replace most uses of CPP_DUST by the corresponding logical defined in lmdz_cppkeys_wrapper.F90 Convert several files from .F to .f90 to allow Dust to compile w/o rrtm/ecrad Create lmdz_yoerad.f90 (lint) Remove "!" on otherwise empty line
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: 27.7 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
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,DIMENSION(klon) :: precip_totsnow, evap_totsnow
188	REAL, DIMENSION (klon,6) :: alb6
189	REAL :: esalt
190	REAL :: lambdasalt,fluxsalt, csalt, nunu, aa, bb, cc
191	REAL :: tau_dens, maxerosion
192	REAL, DIMENSION(klon) :: ws1, rhod, rhos, ustart0, ustart, qsalt, hsalt
193	REAL, DIMENSION(klon) :: fluxbs_1, fluxbs_2, bsweight_fresh
194	LOGICAL, DIMENSION(klon) :: ok_remaining_freshsnow
195	REAL :: ta1, ta2, ta3, z01, z02, z03, coefa, coefb, coefc, coefd
196
197
198	! End definition
199	!****************************************************************************************
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
210	!FC firtscall initializations
211	!******************************************************************************************
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
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
231
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	!****************************************************************************************
255
256
257	IF (landice_opt == 1) THEN
258
259	!****************************************************************************************
260	! CALL to INLANDSIS interface
261	!****************************************************************************************
262	#ifdef CPP_INLANDSIS
263
264	#ifdef ISO
265	CALL abort_gcm('surf_landice 235','isotopes pas dans INLANDSIS',1)
266	#endif
267
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
287	snow_cont_air(:) = 0. ! the snow content in air is not a prognostic variable of the model
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
305	dtis=dtime
306
307	IF (lafin) THEN
308	lafin_is=.true.
309	END IF
310
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, &
316	AcoefH, AcoefQ, BcoefH, BcoefQ, cdragm, cdragh, &
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)
320
321	debut_is=.false.
322
323
324	! Treatment of snow melting and calving
325
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
339	#else
340	abort_message='Pb de coherence: landice_opt = 1 mais CPP_INLANDSIS = .false.'
341	CALL abort_physic(modname,abort_message,1)
342	#endif
343
344
345	ELSE
346
347	!****************************************************************************************
348	! Soil calculations
349
350	!****************************************************************************************
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
357	IF (soil_model) THEN
358	CALL soil(dtime, is_lic, knon, snow, tsurf, qsol, &
359	longitude(knindex(1:knon)), latitude(knindex(1:knon)), tsoil, soilcap, soilflux)
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	!****************************************************************************************
372	! beta(:) = 1.0
373	! dif_grnd(:) = 0.0
374
375	! Suppose zero surface speed
376	u0(:)=0.0
377	v0(:)=0.0
378	u1_lay(:) = u1(:) - u0(:)
379	v1_lay(:) = v1(:) - v0(:)
380
381	CALL calcul_fluxs(knon, is_lic, dtime, &
382	tsurf, p1lay, cal, beta, cdragh, cdragh, ps, &
383	precip_rain, precip_snow, snow, qsurf, &
384	radsol, dif_grnd, temp_air, spechum, u1_lay, v1_lay, gustiness, &
385	1.,AcoefH, AcoefQ, BcoefH, BcoefQ, &
386	tsurf_new, evap, fluxlat, fluxsens, dflux_s, dflux_l)
387
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
413	CALL calcul_flux_wind(knon, dtime, &
414	u0, v0, u1, v1, gustiness, cdragm, &
415	AcoefU, AcoefV, BcoefU, BcoefV, &
416	p1lay, temp_air, &
417	flux_u1, flux_v1)
418
419
420	!****************************************************************************************
421	! Calculate albedo
422
423	!****************************************************************************************
424
425	!IM: plusieurs choix/tests sur l'albedo des "glaciers continentaux"
426	! alb1(1 : knon) = 0.6 !IM cf FH/GK
427	! alb1(1 : knon) = 0.82
428	! alb1(1 : knon) = 0.77 !211003 Ksta0.77
429	! alb1(1 : knon) = 0.8 !KstaTER0.8 & LMD_ARMIP5
430	!IM: KstaTER0.77 & LMD_ARMIP6
431
432	! Attantion: alb1 and alb2 are not the same!
433	alb1(1:knon) = alb_vis_sno_lic
434	alb2(1:knon) = alb_nir_sno_lic
435
436
437	!****************************************************************************************
438	! Rugosity
439
440	!****************************************************************************************
441
442	if (z0m_landice > 0.) then
443	z0m(1:knon) = z0m_landice
444	z0h(1:knon) = z0h_landice
445	else
446	! parameterization of z0=f(T) following measurements in Adelie Land by Amory et al 2018
447	coefa = 0.1658 !0.1862 !Ant
448	coefb = -50.3869 !-55.7718 !Ant
449	ta1 = 253.15 !255. Ant
450	ta2 = 273.15
451	ta3 = 273.15+3
452	z01 = exp(coefa*ta1 + coefb) !~0.2 ! ~0.25 mm
453	z02 = exp(coefa*ta2 + coefb) !~6 !~7 mm
454	z03 = z01
455	coefc = log(z03/z02)/(ta3-ta2)
456	coefd = log(z03)-coefc*ta3
457	do j=1,knon
458	if (temp_air(j) < ta1) then
459	z0m(j) = z01
460	else if (temp_air(j)>=ta1 .and. temp_air(j)<ta2) then
461	z0m(j) = exp(coefa*temp_air(j) + coefb)
462	else if (temp_air(j)>=ta2 .and. temp_air(j)<ta3) then
463	! if st > 0, melting induce smooth surface
464	z0m(j) = exp(coefc*temp_air(j) + coefd)
465	else
466	z0m(j) = z03
467	endif
468	z0h(j)=z0m(j)
469	enddo
470
471	endif
472
473
474	!****************************************************************************************
475	! Simple blowing snow param
476	!****************************************************************************************
477	! we proceed in 2 steps:
478	! first we erode - if possible -the accumulated snow during the time step
479	! then we update the density of the underlying layer and see if we can also erode
480	! this layer
481
482
483	if (ok_bs) then
484	fluxbs(:)=0.
485	do j=1,knon
486	ws1(j)=(u1(j)2+v1(j)2)**0.5
487	ustar(j)=(cdragm(j)(u1(j)2+v1(j)2))*0.5
488	rhod(j)=p1lay(j)/RD/temp_air(j)
489	ustart0(j) =(log(2.868)-log(1.625))/0.085*sqrt(cdragm(j))
490	enddo
491
492	! 1st step: erosion of fresh snow accumulated during the time step
493	do j=1, knon
494	if (precip_snow(j) > 0.) then
495	rhos(j)=rhofresh_bs
496	! blowing snow flux formula used in MAR
497	ustart(j)=ustart0(j)exp(max(rhoice_bs/rhofresh_bs-rhoice_bs/rhos(j),0.))exp(max(0.,rhos(j)-rhohard_bs))
498	! we have multiplied by exp to prevent erosion when rhos>rhohard_bs
499	! computation of qbs at the top of the saltation layer
500	! default formulation from MAR model (Amory et al. 2021, Gallee et al. 2001)
501	esalt=1./(c_esalt_bs*max(1.e-6,ustar(j)))
502	hsalt(j)=0.08436(max(1.e-6,ustar(j))*1.27)
503	qsalt(j)=(max(ustar(j)2-ustart(j)2,0.))/(RGhsalt(j))esalt
504	! calculation of erosion (flux positive towards the surface here)
505	! consistent with implicit resolution of turbulent mixing equation
506	! Nemoto and Nishimura 2004 show that steady-state saltation is achieved within a time tau_eqsalt_bs of about 10s
507	! we thus prevent snowerosion (snow particle transfer from the saltation layer to the first model level)
508	! integrated over tau_eqsalt_bs to exceed the total mass of snow particle in the saltation layer
509	! (rhoqsalthsalt)
510	! during this first step we also lower bound the erosion to the amount of fresh snow accumulated during the time step
511	maxerosion=min(precip_snow(j),hsalt(j)qsalt(j)rhod(j)/tau_eqsalt_bs)
512
513	fluxbs_1(j)=rhod(j)ws1(j)cdragh(j)zeta_bs(AcoefQBS(j)-qsalt(j)) &
514	/ (1.-rhod(j)ws1(j)cdragh(j)zeta_bsBcoefQBS(j)*dtime)
515	fluxbs_1(j)=max(-maxerosion,fluxbs_1(j))
516
517	if (precip_snow(j) > abs(fluxbs_1(j))) then
518	ok_remaining_freshsnow(j)=.true.
519	bsweight_fresh(j)=1.
520	else
521	ok_remaining_freshsnow(j)=.false.
522	bsweight_fresh(j)=exp(-(abs(fluxbs_1(j))-precip_snow(j))/precip_snow(j))
523	endif
524	else
525	ok_remaining_freshsnow(j)=.false.
526	fluxbs_1(j)=0.
527	bsweight_fresh(j)=0.
528	endif
529	enddo
530
531
532	! we now compute the snow age of the overlying layer (snow surface after erosion of the fresh snow accumulated during the time step)
533	! this is done through the routine albsno
534	CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:)+fluxbs_1(:))
535
536	! 2nd step:
537	! computation of threshold friction velocity
538	! which depends on surface snow density
539	do j = 1, knon
540	if (ok_remaining_freshsnow(j)) then
541	fluxbs_2(j)=0.
542	else
543	! we start eroding the underlying layer
544	! estimation of snow density
545	! snow density increases with snow age and
546	! increases even faster in case of sedimentation of blowing snow or rain
547	tau_dens=max(tau_densmin_bs, tau_dens0_bs*exp(-abs(precip_bs(j))/pbst_bs - &
548	abs(precip_rain(j))/prt_bs)*exp(-max(tsurf(j)-RTT,0.)))
549	rhos(j)=rhofresh_bs+(rhohard_bs-rhofresh_bs)(1.-exp(-agesno(j)86400.0/tau_dens))
550	! blowing snow flux formula used in MAR
551	ustart(j)=ustart0(j)exp(max(rhoice_bs/rhofresh_bs-rhoice_bs/rhos(j),0.))exp(max(0.,rhos(j)-rhohard_bs))
552	! we have multiplied by exp to prevent erosion when rhos>rhohard_bs
553	! computation of qbs at the top of the saltation layer
554	! default formulation from MAR model (Amory et al. 2021, Gallee et al. 2001)
555	esalt=1./(c_esalt_bs*max(1.e-6,ustar(j)))
556	hsalt(j)=0.08436(max(1.e-6,ustar(j))*1.27)
557	qsalt(j)=(max(ustar(j)2-ustart(j)2,0.))/(RGhsalt(j))esalt
558	! calculation of erosion (flux positive towards the surface here)
559	! consistent with implicit resolution of turbulent mixing equation
560	! Nemoto and Nishimura 2004 show that steady-state saltation is achieved within a time tau_eqsalt_bs of about 10s
561	! we thus prevent snowerosion (snow particle transfer from the saltation layer to the first model level)
562	! integrated over tau_eqsalt_bs to exceed the total mass of snow particle in the saltation layer
563	! (rhoqsalthsalt)
564	maxerosion=hsalt(j)qsalt(j)rhod(j)/tau_eqsalt_bs
565	fluxbs_2(j)=rhod(j)ws1(j)cdragh(j)zeta_bs(AcoefQBS(j)-qsalt(j)) &
566	/ (1.-rhod(j)ws1(j)cdragh(j)zeta_bsBcoefQBS(j)*dtime)
567	fluxbs_2(j)=max(-maxerosion,fluxbs_2(j))
568	endif
569	enddo
570
571
572
573
574	! final flux and outputs
575	do j=1, knon
576	! total flux is the erosion of fresh snow +
577	! a fraction of the underlying snow (if all the fresh snow has been eroded)
578	! the calculation of the fraction is quite delicate since we do not know
579	! how much time was needed to erode the fresh snow. We assume that this time
580	! is dtexp(-(abs(fluxbs1)-precipsnow)/precipsnow)=dtbsweight_fresh
581
582	fluxbs(j)=fluxbs_1(j)+fluxbs_2(j)*(1.-bsweight_fresh(j))
583	i = knindex(j)
584	zxustartlic(i) = ustart(j)
585	zxrhoslic(i) = rhos(j)
586	zxqsaltlic(i)=qsalt(j)
587	enddo
588
589
590	else ! not ok_bs
591	! those lines are useful to calculate the snow age
592	CALL albsno(klon,knon,dtime,agesno(:),alb_neig(:), precip_snow(:))
593
594	endif ! if ok_bs
595
596
597
598	!****************************************************************************************
599	! Calculate snow amount
600
601	!****************************************************************************************
602	IF (ok_bs) THEN
603	precip_totsnow(:)=precip_snow(:)+precip_bs(:)
604	evap_totsnow(:)=evap(:)-fluxbs(:) ! flux bs is positive towards the surface (snow erosion)
605	ELSE
606	precip_totsnow(:)=precip_snow(:)
607	evap_totsnow(:)=evap(:)
608	ENDIF
609
610
611	CALL fonte_neige(knon, is_lic, knindex, dtime, &
612	tsurf, precip_rain, precip_totsnow, &
613	snow, qsol, tsurf_new, evap_totsnow &
614	#ifdef ISO
615	,fq_fonte_diag,fqfonte_diag,snow_evap_diag,fqcalving_diag &
616	,max_eau_sol_diag,runoff_diag,run_off_lic_diag,coeff_rel_diag &
617	#endif
618	)
619
620
621	#ifdef ISO
622	#ifdef ISOVERIF
623	DO i=1,knon
624	IF (iso_eau > 0) THEN
625	CALL iso_verif_egalite_choix(Rland_ice(iso_eau,i),1.0, &
626	'surf_landice_mod 217',errmax,errmaxrel)
627	ENDIF !IF (iso_eau > 0) THEN
628	ENDDO !DO i=1,knon
629	#endif
630
631	CALL calcul_iso_surf_lic_vectall(klon,knon, &
632	evap,snow_evap_diag,Tsurf_new,snow, &
633	fq_fonte_diag,fqfonte_diag,dtime,t_coup, &
634	precip_snow,xtprecip_snow,precip_rain,xtprecip_rain, snow_prec,xtsnow_prec, &
635	xtspechum,spechum,ps,Rland_ice, &
636	xtevap,xtsnow,fqcalving_diag, &
637	knindex,is_lic,run_off_lic_diag,coeff_rel_diag &
638	)
639
640	! call fonte_neige_export_xtrun_off_lic_0(knon,xtrun_off_lic_0_diag)
641
642	#endif
643
644	WHERE (snow(1 : knon) < 0.0001) agesno(1 : knon) = 0.
645	zfra(1:knon) = MAX(0.0,MIN(1.0,snow(1:knon)/(snow(1:knon)+10.0)))
646
647
648	END IF ! landice_opt
649
650
651	!****************************************************************************************
652	! Send run-off on land-ice to coupler if coupled ocean.
653	! run_off_lic has been calculated in fonte_neige or surf_inlandsis
654	! If landice_opt>=2, corresponding call is done from surf_land_orchidee
655	!****************************************************************************************
656	IF (type_ocean=='couple' .AND. landice_opt < 2) THEN
657	! Compress fraction where run_off_lic is active (here all pctsrf(is_lic))
658	run_off_lic_frac(:)=0.0
659	DO j = 1, knon
660	i = knindex(j)
661	run_off_lic_frac(j) = pctsrf(i,is_lic)
662	ENDDO
663
664	CALL cpl_send_landice_fields(itime, knon, knindex, run_off_lic, run_off_lic_frac)
665	ENDIF
666
667	! transfer runoff rate [kg/m2/s](!) to physiq for output
668	runoff(1:knon)=run_off_lic(1:knon)/dtime
669
670	snow_o=0.
671	zfra_o = 0.
672	DO j = 1, knon
673	i = knindex(j)
674	snow_o(i) = snow(j)
675	zfra_o(i) = zfra(j)
676	ENDDO
677
678
679	!albedo SB >>>
680	select case(NSW)
681	case(2)
682	alb_dir(1:knon,1)=alb1(1:knon)
683	alb_dir(1:knon,2)=alb2(1:knon)
684	case(4)
685	alb_dir(1:knon,1)=alb1(1:knon)
686	alb_dir(1:knon,2)=alb2(1:knon)
687	alb_dir(1:knon,3)=alb2(1:knon)
688	alb_dir(1:knon,4)=alb2(1:knon)
689	case(6)
690	alb_dir(1:knon,1)=alb1(1:knon)
691	alb_dir(1:knon,2)=alb1(1:knon)
692	alb_dir(1:knon,3)=alb1(1:knon)
693	alb_dir(1:knon,4)=alb2(1:knon)
694	alb_dir(1:knon,5)=alb2(1:knon)
695	alb_dir(1:knon,6)=alb2(1:knon)
696
697	IF ((landice_opt == 1) .AND. (iflag_albcalc == 2)) THEN
698	alb_dir(1:knon,1)=alb6(1:knon,1)
699	alb_dir(1:knon,2)=alb6(1:knon,2)
700	alb_dir(1:knon,3)=alb6(1:knon,3)
701	alb_dir(1:knon,4)=alb6(1:knon,4)
702	alb_dir(1:knon,5)=alb6(1:knon,5)
703	alb_dir(1:knon,6)=alb6(1:knon,6)
704	ENDIF
705
706	end select
707	alb_dif=alb_dir
708	!albedo SB <<<
709
710
711	END SUBROUTINE surf_landice
712
713	!****************************************************************************************
714
715	END MODULE surf_landice_mod
716
717
718

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