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ocean_slab_mod.F90 @ 2314

Last change on this file since 2314 was 2298, checked in by Laurent Fairhead, 9 years ago
Merged trunk changes -r2237:2291 into testing branch
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:executable set to ``* Property svn:keywords set to `Author Date Id Revision`
File size: 28.8 KB

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1	!
2	MODULE ocean_slab_mod
3	!
4	! This module is used for both surface ocean and sea-ice when using the slab ocean,
5	! "ocean=slab".
6	!
7
8	USE dimphy
9	USE indice_sol_mod
10	USE surface_data
11
12	IMPLICIT NONE
13	PRIVATE
14	PUBLIC :: ocean_slab_init, ocean_slab_frac, ocean_slab_noice, ocean_slab_ice
15
16	!****************************************************************************************
17	! Global saved variables
18	!****************************************************************************************
19
20	INTEGER, PRIVATE, SAVE :: cpl_pas
21	!$OMP THREADPRIVATE(cpl_pas)
22	REAL, PRIVATE, SAVE :: cyang
23	!$OMP THREADPRIVATE(cyang)
24	REAL, ALLOCATABLE, DIMENSION(:), PRIVATE, SAVE :: slabh
25	!$OMP THREADPRIVATE(slabh)
26	REAL, ALLOCATABLE, DIMENSION(:,:), PUBLIC, SAVE :: tslab
27	!$OMP THREADPRIVATE(tslab)
28	REAL, ALLOCATABLE, DIMENSION(:), PUBLIC, SAVE :: fsic
29	!$OMP THREADPRIVATE(fsic)
30	REAL, ALLOCATABLE, DIMENSION(:), PUBLIC, SAVE :: tice
31	!$OMP THREADPRIVATE(tice)
32	REAL, ALLOCATABLE, DIMENSION(:), PUBLIC, SAVE :: seaice
33	!$OMP THREADPRIVATE(seaice)
34	REAL, ALLOCATABLE, DIMENSION(:), PUBLIC, SAVE :: slab_bils
35	!$OMP THREADPRIVATE(slab_bils)
36	REAL, ALLOCATABLE, DIMENSION(:), PRIVATE, SAVE :: bils_cum
37	!$OMP THREADPRIVATE(bils_cum)
38	REAL, ALLOCATABLE, DIMENSION(:), PUBLIC, SAVE :: slab_bilg
39	!$OMP THREADPRIVATE(slab_bilg)
40	REAL, ALLOCATABLE, DIMENSION(:), PRIVATE, SAVE :: bilg_cum
41	!$OMP THREADPRIVATE(bilg_cum)
42
43	!****************************************************************************************
44	! Parameters (could be read in def file: move to slab_init)
45	!****************************************************************************************
46	! snow and ice physical characteristics:
47	REAL, PARAMETER :: t_freeze=271.35 ! freezing sea water temp
48	REAL, PARAMETER :: t_melt=273.15 ! melting ice temp
49	REAL, PARAMETER :: sno_den=300. !mean snow density, kg/m3
50	REAL, PARAMETER :: ice_den=917.
51	REAL, PARAMETER :: sea_den=1025.
52	REAL, PARAMETER :: ice_cond=2.17*ice_den !conductivity
53	REAL, PARAMETER :: sno_cond=0.31*sno_den
54	REAL, PARAMETER :: ice_cap=2067. ! specific heat capacity, snow and ice
55	REAL, PARAMETER :: ice_lat=334000. ! freeze /melt latent heat snow and ice
56
57	! control of snow and ice cover & freeze / melt (heights converted to kg/m2)
58	REAL, PARAMETER :: snow_min=0.05*sno_den !critical snow height 5 cm
59	REAL, PARAMETER :: snow_wfact=0.4 ! max fraction of falling snow blown into ocean
60	REAL, PARAMETER :: ice_frac_min=0.001
61	REAL, PARAMETER :: ice_frac_max=1. ! less than 1. if min leads fraction
62	REAL, PARAMETER :: h_ice_min=0.01*ice_den ! min ice thickness
63	REAL, PARAMETER :: h_ice_thin=0.15*ice_den ! thin ice thickness
64	! below ice_thin, priority is melt lateral / grow height
65	! ice_thin is also height of new ice
66	REAL, PARAMETER :: h_ice_thick=2.5*ice_den ! thin ice thickness
67	! above ice_thick, priority is melt height / grow lateral
68	REAL, PARAMETER :: h_ice_new=1.*ice_den ! max height of new open ocean ice
69	REAL, PARAMETER :: h_ice_max=10.*ice_den ! max ice height
70
71	! albedo and radiation parameters
72	REAL, PARAMETER :: alb_sno_min=0.55 !min snow albedo
73	REAL, PARAMETER :: alb_sno_del=0.3 !max snow albedo = min + del
74	REAL, PARAMETER :: alb_ice_dry=0.75 !dry thick ice
75	REAL, PARAMETER :: alb_ice_wet=0.66 !melting thick ice
76	REAL, PARAMETER :: pen_frac=0.3 !fraction of penetrating shortwave (no snow)
77	REAL, PARAMETER :: pen_ext=1.5 !extinction of penetrating shortwave (m-1)
78
79	!****************************************************************************************
80
81	CONTAINS
82	!
83	!****************************************************************************************
84	!
85	SUBROUTINE ocean_slab_init(dtime, pctsrf_rst)
86	!, seaice_rst etc
87
88	use IOIPSL
89
90	INCLUDE "iniprint.h"
91	! For ok_xxx vars (Ekman...)
92	INCLUDE "clesphys.h"
93
94	! Input variables
95	!****************************************************************************************
96	REAL, INTENT(IN) :: dtime
97	! Variables read from restart file
98	REAL, DIMENSION(klon, nbsrf), INTENT(IN) :: pctsrf_rst
99
100	! Local variables
101	!****************************************************************************************
102	INTEGER :: error
103	CHARACTER (len = 80) :: abort_message
104	CHARACTER (len = 20) :: modname = 'ocean_slab_intit'
105
106	!****************************************************************************************
107	! Allocate surface fraction read from restart file
108	!****************************************************************************************
109	ALLOCATE(fsic(klon), stat = error)
110	IF (error /= 0) THEN
111	abort_message='Pb allocation tmp_pctsrf_slab'
112	CALL abort_gcm(modname,abort_message,1)
113	ENDIF
114	fsic(:)=0.
115	WHERE (1.-zmasq(:)>EPSFRA)
116	fsic(:) = pctsrf_rst(:,is_sic)/(1.-zmasq(:))
117	END WHERE
118
119	!****************************************************************************************
120	! Allocate saved variables
121	!****************************************************************************************
122	ALLOCATE(tslab(klon,nslay), stat=error)
123	IF (error /= 0) CALL abort_gcm &
124	(modname,'pb allocation tslab', 1)
125
126	ALLOCATE(slab_bils(klon), stat = error)
127	IF (error /= 0) THEN
128	abort_message='Pb allocation slab_bils'
129	CALL abort_gcm(modname,abort_message,1)
130	ENDIF
131	slab_bils(:) = 0.0
132	ALLOCATE(bils_cum(klon), stat = error)
133	IF (error /= 0) THEN
134	abort_message='Pb allocation slab_bils_cum'
135	CALL abort_gcm(modname,abort_message,1)
136	ENDIF
137	bils_cum(:) = 0.0
138
139	IF (version_ocean=='sicINT') THEN
140	ALLOCATE(slab_bilg(klon), stat = error)
141	IF (error /= 0) THEN
142	abort_message='Pb allocation slab_bilg'
143	CALL abort_gcm(modname,abort_message,1)
144	ENDIF
145	slab_bilg(:) = 0.0
146	ALLOCATE(bilg_cum(klon), stat = error)
147	IF (error /= 0) THEN
148	abort_message='Pb allocation slab_bilg_cum'
149	CALL abort_gcm(modname,abort_message,1)
150	ENDIF
151	bilg_cum(:) = 0.0
152	ALLOCATE(tice(klon), stat = error)
153	IF (error /= 0) THEN
154	abort_message='Pb allocation slab_tice'
155	CALL abort_gcm(modname,abort_message,1)
156	ENDIF
157	ALLOCATE(seaice(klon), stat = error)
158	IF (error /= 0) THEN
159	abort_message='Pb allocation slab_seaice'
160	CALL abort_gcm(modname,abort_message,1)
161	ENDIF
162	END IF
163
164	!****************************************************************************************
165	! Define some parameters
166	!****************************************************************************************
167	! Layer thickness
168	ALLOCATE(slabh(nslay), stat = error)
169	IF (error /= 0) THEN
170	abort_message='Pb allocation slabh'
171	CALL abort_gcm(modname,abort_message,1)
172	ENDIF
173	slabh(1)=50.
174	! cyang = 1/heat capacity of top layer (rho.c.H)
175	cyang=1/(slabh(1)*4.228e+06)
176
177	! cpl_pas periode de couplage avec slab (update tslab, pctsrf)
178	! pour un calcul à chaque pas de temps, cpl_pas=1
179	cpl_pas = NINT(86400./dtime * 1.0) ! une fois par jour
180	CALL getin('cpl_pas',cpl_pas)
181	print *,'cpl_pas',cpl_pas
182
183	END SUBROUTINE ocean_slab_init
184	!
185	!****************************************************************************************
186	!
187	SUBROUTINE ocean_slab_frac(itime, dtime, jour, pctsrf_chg, is_modified)
188
189	USE limit_read_mod
190
191	! INCLUDE "clesphys.h"
192
193	! Arguments
194	!****************************************************************************************
195	INTEGER, INTENT(IN) :: itime ! numero du pas de temps courant
196	INTEGER, INTENT(IN) :: jour ! jour a lire dans l'annee
197	REAL , INTENT(IN) :: dtime ! pas de temps de la physique (en s)
198	REAL, DIMENSION(klon,nbsrf), INTENT(INOUT) :: pctsrf_chg ! sub-surface fraction
199	LOGICAL, INTENT(OUT) :: is_modified ! true if pctsrf is modified at this time step
200
201	! Local variables
202	!****************************************************************************************
203
204	IF (version_ocean == 'sicOBS'.OR. version_ocean == 'sicNO') THEN
205	CALL limit_read_frac(itime, dtime, jour, pctsrf_chg, is_modified)
206	ELSE
207	pctsrf_chg(:,is_oce)=(1.-fsic(:))*(1.-zmasq(:))
208	pctsrf_chg(:,is_sic)=fsic(:)*(1.-zmasq(:))
209	is_modified=.TRUE.
210	END IF
211
212	END SUBROUTINE ocean_slab_frac
213	!
214	!****************************************************************************************
215	!
216	SUBROUTINE ocean_slab_noice( &
217	itime, dtime, jour, knon, knindex, &
218	p1lay, cdragh, cdragq, cdragm, precip_rain, precip_snow, temp_air, spechum, &
219	AcoefH, AcoefQ, BcoefH, BcoefQ, &
220	AcoefU, AcoefV, BcoefU, BcoefV, &
221	ps, u1, v1, gustiness, tsurf_in, &
222	radsol, snow, &
223	qsurf, evap, fluxsens, fluxlat, flux_u1, flux_v1, &
224	tsurf_new, dflux_s, dflux_l, qflux)
225
226	USE calcul_fluxs_mod
227
228	INCLUDE "iniprint.h"
229	INCLUDE "clesphys.h"
230
231	! Input arguments
232	!****************************************************************************************
233	INTEGER, INTENT(IN) :: itime
234	INTEGER, INTENT(IN) :: jour
235	INTEGER, INTENT(IN) :: knon
236	INTEGER, DIMENSION(klon), INTENT(IN) :: knindex
237	REAL, INTENT(IN) :: dtime
238	REAL, DIMENSION(klon), INTENT(IN) :: p1lay
239	REAL, DIMENSION(klon), INTENT(IN) :: cdragh, cdragq, cdragm
240	REAL, DIMENSION(klon), INTENT(IN) :: precip_rain, precip_snow
241	REAL, DIMENSION(klon), INTENT(IN) :: temp_air, spechum
242	REAL, DIMENSION(klon), INTENT(IN) :: AcoefH, AcoefQ, BcoefH, BcoefQ
243	REAL, DIMENSION(klon), INTENT(IN) :: AcoefU, AcoefV, BcoefU, BcoefV
244	REAL, DIMENSION(klon), INTENT(IN) :: ps
245	REAL, DIMENSION(klon), INTENT(IN) :: u1, v1, gustiness
246	REAL, DIMENSION(klon), INTENT(IN) :: tsurf_in
247	REAL, DIMENSION(klon), INTENT(INOUT) :: radsol
248
249	! In/Output arguments
250	!****************************************************************************************
251	REAL, DIMENSION(klon), INTENT(INOUT) :: snow
252
253	! Output arguments
254	!****************************************************************************************
255	REAL, DIMENSION(klon), INTENT(OUT) :: qsurf
256	REAL, DIMENSION(klon), INTENT(OUT) :: evap, fluxsens, fluxlat
257	REAL, DIMENSION(klon), INTENT(OUT) :: flux_u1, flux_v1
258	REAL, DIMENSION(klon), INTENT(OUT) :: tsurf_new
259	REAL, DIMENSION(klon), INTENT(OUT) :: dflux_s, dflux_l
260	REAL, DIMENSION(klon), INTENT(OUT) :: qflux
261
262	! Local variables
263	!****************************************************************************************
264	INTEGER :: i,ki
265	! surface fluxes
266	REAL, DIMENSION(klon) :: cal, beta, dif_grnd
267	! flux correction
268	REAL, DIMENSION(klon) :: diff_sst, diff_siv, lmt_bils
269	! surface wind stress
270	REAL, DIMENSION(klon) :: u0, v0
271	REAL, DIMENSION(klon) :: u1_lay, v1_lay
272	! ice creation
273	REAL :: e_freeze, h_new, dfsic
274
275	!****************************************************************************************
276	! 1) Flux calculation
277	!
278	!****************************************************************************************
279	cal(:) = 0.
280	beta(:) = 1.
281	dif_grnd(:) = 0.
282
283	! Suppose zero surface speed
284	u0(:)=0.0
285	v0(:)=0.0
286	u1_lay(:) = u1(:) - u0(:)
287	v1_lay(:) = v1(:) - v0(:)
288
289	CALL calcul_fluxs(knon, is_oce, dtime, &
290	tsurf_in, p1lay, cal, beta, cdragh, cdragq, ps, &
291	precip_rain, precip_snow, snow, qsurf, &
292	radsol, dif_grnd, temp_air, spechum, u1_lay, v1_lay, gustiness, &
293	f_qsat_oce,AcoefH, AcoefQ, BcoefH, BcoefQ, &
294	tsurf_new, evap, fluxlat, fluxsens, dflux_s, dflux_l)
295
296	! - Flux calculation at first modele level for U and V
297	CALL calcul_flux_wind(knon, dtime, &
298	u0, v0, u1, v1, gustiness, cdragm, &
299	AcoefU, AcoefV, BcoefU, BcoefV, &
300	p1lay, temp_air, &
301	flux_u1, flux_v1)
302
303	! Accumulate total fluxes locally
304	slab_bils(:)=0.
305	DO i=1,knon
306	ki=knindex(i)
307	slab_bils(ki)=(1.-fsic(ki))*(fluxlat(i)+fluxsens(i)+radsol(i) &
308	-precip_snow(i)ice_lat(1.+snow_wfact*fsic(ki)))
309	bils_cum(ki)=bils_cum(ki)+slab_bils(ki)
310	! Also taux, tauy, saved vars...
311	END DO
312
313	!****************************************************************************************
314	! 2) Get global variables lmt_bils and diff_sst from file limit_slab.nc
315	!
316	!****************************************************************************************
317	lmt_bils(:)=0.
318	CALL limit_slab(itime, dtime, jour, lmt_bils, diff_sst, diff_siv) ! global pour un processus
319	! lmt_bils and diff_sst,siv saved by limit_slab
320	qflux(:)=lmt_bils(:)+diff_sst(:)/cyang/86400.-diff_siv(:)ice_denice_lat/86400.
321	! qflux = total QFlux correction (in W/m2)
322
323	!****************************************************************************************
324	! 3) Recalculate new temperature
325	!
326	!*********************************************o***************************************
327	tsurf_new=tsurf_in
328	IF (MOD(itime,cpl_pas).EQ.0) THEN ! time to update tslab & fraction
329	! Compute transport
330	! Add read QFlux and SST tendency
331	tslab(:,1)=tslab(:,1)+qflux(:)cyangdtime*cpl_pas
332	! Add cumulated surface fluxes
333	tslab(:,1)=tslab(:,1)+bils_cum(:)cyangdtime
334	! Update surface temperature
335	SELECT CASE(version_ocean)
336	CASE('sicNO')
337	DO i=1,knon
338	ki=knindex(i)
339	tsurf_new(i)=tslab(ki,1)
340	END DO
341	CASE('sicOBS') ! check for sea ice or tslab below freezing
342	DO i=1,knon
343	ki=knindex(i)
344	IF ((tslab(ki,1).LT.t_freeze).OR.(fsic(ki).GT.epsfra)) THEN
345	tslab(ki,1)=t_freeze
346	END IF
347	tsurf_new(i)=tslab(ki,1)
348	END DO
349	CASE('sicINT')
350	DO i=1,knon
351	ki=knindex(i)
352	IF (fsic(ki).LT.epsfra) THEN ! Free of ice
353	IF (tslab(ki,1).LT.t_freeze) THEN ! create new ice
354	! quantity of new ice formed
355	e_freeze=(t_freeze-tslab(ki,1))/cyang/ice_lat
356	! new ice
357	tice(ki)=t_freeze
358	fsic(ki)=MIN(ice_frac_max,e_freeze/h_ice_thin)
359	IF (fsic(ki).GT.ice_frac_min) THEN
360	seaice(ki)=MIN(e_freeze/fsic(ki),h_ice_max)
361	tslab(ki,1)=t_freeze
362	ELSE
363	fsic(ki)=0.
364	END IF
365	tsurf_new(i)=t_freeze
366	ELSE
367	tsurf_new(i)=tslab(ki,1)
368	END IF
369	ELSE ! ice present
370	tsurf_new(i)=t_freeze
371	IF (tslab(ki,1).LT.t_freeze) THEN ! create new ice
372	! quantity of new ice formed over open ocean
373	e_freeze=(t_freeze-tslab(ki,1))/cyang*(1.-fsic(ki)) &
374	/(ice_lat+ice_cap/2.*(t_freeze-tice(ki)))
375	! new ice height and fraction
376	h_new=MIN(h_ice_new,seaice(ki)) ! max new height ice_new
377	dfsic=MIN(ice_frac_max-fsic(ki),e_freeze/h_new)
378	h_new=MIN(e_freeze/dfsic,h_ice_max)
379	! update tslab to freezing over open ocean only
380	tslab(ki,1)=tslab(ki,1)fsic(ki)+t_freeze(1.-fsic(ki))
381	! update sea ice
382	seaice(ki)=(h_newdfsic+seaice(ki)fsic(ki)) &
383	/(dfsic+fsic(ki))
384	fsic(ki)=fsic(ki)+dfsic
385	! update snow?
386	END IF !freezing
387	END IF ! sea ice present
388	END DO
389	END SELECT
390	bils_cum(:)=0.0! clear cumulated fluxes
391	END IF ! coupling time
392	END SUBROUTINE ocean_slab_noice
393	!
394	!****************************************************************************************
395
396	SUBROUTINE ocean_slab_ice( &
397	itime, dtime, jour, knon, knindex, &
398	tsurf_in, p1lay, cdragh, cdragm, precip_rain, precip_snow, temp_air, spechum, &
399	AcoefH, AcoefQ, BcoefH, BcoefQ, &
400	AcoefU, AcoefV, BcoefU, BcoefV, &
401	ps, u1, v1, gustiness, &
402	radsol, snow, qsurf, qsol, agesno, &
403	alb1_new, alb2_new, evap, fluxsens, fluxlat, flux_u1, flux_v1, &
404	tsurf_new, dflux_s, dflux_l, swnet)
405
406	USE calcul_fluxs_mod
407
408	INCLUDE "YOMCST.h"
409	INCLUDE "clesphys.h"
410
411	! Input arguments
412	!****************************************************************************************
413	INTEGER, INTENT(IN) :: itime, jour, knon
414	INTEGER, DIMENSION(klon), INTENT(IN) :: knindex
415	REAL, INTENT(IN) :: dtime
416	REAL, DIMENSION(klon), INTENT(IN) :: tsurf_in
417	REAL, DIMENSION(klon), INTENT(IN) :: p1lay
418	REAL, DIMENSION(klon), INTENT(IN) :: cdragh, cdragm
419	REAL, DIMENSION(klon), INTENT(IN) :: precip_rain, precip_snow
420	REAL, DIMENSION(klon), INTENT(IN) :: temp_air, spechum
421	REAL, DIMENSION(klon), INTENT(IN) :: AcoefH, AcoefQ, BcoefH, BcoefQ
422	REAL, DIMENSION(klon), INTENT(IN) :: AcoefU, AcoefV, BcoefU, BcoefV
423	REAL, DIMENSION(klon), INTENT(IN) :: ps
424	REAL, DIMENSION(klon), INTENT(IN) :: u1, v1, gustiness
425	REAL, DIMENSION(klon), INTENT(IN) :: swnet
426
427	! In/Output arguments
428	!****************************************************************************************
429	REAL, DIMENSION(klon), INTENT(INOUT) :: snow, qsol
430	REAL, DIMENSION(klon), INTENT(INOUT) :: agesno
431	REAL, DIMENSION(klon), INTENT(INOUT) :: radsol
432
433	! Output arguments
434	!****************************************************************************************
435	REAL, DIMENSION(klon), INTENT(OUT) :: qsurf
436	REAL, DIMENSION(klon), INTENT(OUT) :: alb1_new ! new albedo in visible SW interval
437	REAL, DIMENSION(klon), INTENT(OUT) :: alb2_new ! new albedo in near IR interval
438	REAL, DIMENSION(klon), INTENT(OUT) :: evap, fluxsens, fluxlat
439	REAL, DIMENSION(klon), INTENT(OUT) :: flux_u1, flux_v1
440	REAL, DIMENSION(klon), INTENT(OUT) :: tsurf_new
441	REAL, DIMENSION(klon), INTENT(OUT) :: dflux_s, dflux_l
442
443	! Local variables
444	!****************************************************************************************
445	INTEGER :: i,ki
446	REAL, DIMENSION(klon) :: cal, beta, dif_grnd
447	REAL, DIMENSION(klon) :: u0, v0
448	REAL, DIMENSION(klon) :: u1_lay, v1_lay
449	! intermediate heat fluxes:
450	REAL :: f_cond, f_swpen
451	! for snow/ice albedo:
452	REAL :: alb_snow, alb_ice, alb_pond
453	REAL :: frac_snow, frac_ice, frac_pond
454	! for ice melt / freeze
455	REAL :: e_melt, snow_evap, h_test
456	! dhsic, dfsic change in ice mass, fraction.
457	REAL :: dhsic, dfsic, frac_mf
458
459	!****************************************************************************************
460	! 1) Flux calculation
461	!****************************************************************************************
462	! Suppose zero surface speed
463	u0(:)=0.0
464	v0(:)=0.0
465	u1_lay(:) = u1(:) - u0(:)
466	v1_lay(:) = v1(:) - v0(:)
467
468	! set beta, cal, compute conduction fluxes inside ice/snow
469	slab_bilg(:)=0.
470	dif_grnd(:)=0.
471	beta(:) = 1.
472	DO i=1,knon
473	ki=knindex(i)
474	IF (snow(i).GT.snow_min) THEN
475	! snow-layer heat capacity
476	cal(i)=2.RCPD/(snow(i)ice_cap)
477	! snow conductive flux
478	f_cond=sno_cond*(tice(ki)-tsurf_in(i))/snow(i)
479	! all shortwave flux absorbed
480	f_swpen=0.
481	! bottom flux (ice conduction)
482	slab_bilg(ki)=ice_cond*(tice(ki)-t_freeze)/seaice(ki)
483	! update ice temperature
484	tice(ki)=tice(ki)-2./ice_cap/(snow(i)+seaice(ki)) &
485	(slab_bilg(ki)+f_cond)dtime
486	ELSE ! bare ice
487	! ice-layer heat capacity
488	cal(i)=2.RCPD/(seaice(ki)ice_cap)
489	! conductive flux
490	f_cond=ice_cond*(t_freeze-tice(ki))/seaice(ki)
491	! penetrative shortwave flux...
492	f_swpen=swnet(i)pen_fracexp(-pen_ext*seaice(ki)/ice_den)
493	slab_bilg(ki)=f_swpen-f_cond
494	END IF
495	radsol(i)=radsol(i)+f_cond-f_swpen
496	END DO
497	! weight fluxes to ocean by sea ice fraction
498	slab_bilg(:)=slab_bilg(:)*fsic(:)
499
500	! calcul_fluxs (sens, lat etc)
501	CALL calcul_fluxs(knon, is_sic, dtime, &
502	tsurf_in, p1lay, cal, beta, cdragh, cdragh, ps, &
503	precip_rain, precip_snow, snow, qsurf, &
504	radsol, dif_grnd, temp_air, spechum, u1_lay, v1_lay, gustiness, &
505	f_qsat_oce,AcoefH, AcoefQ, BcoefH, BcoefQ, &
506	tsurf_new, evap, fluxlat, fluxsens, dflux_s, dflux_l)
507	DO i=1,knon
508	IF (snow(i).LT.snow_min) tice(knindex(i))=tsurf_new(i)
509	END DO
510
511	! calcul_flux_wind
512	CALL calcul_flux_wind(knon, dtime, &
513	u0, v0, u1, v1, gustiness, cdragm, &
514	AcoefU, AcoefV, BcoefU, BcoefV, &
515	p1lay, temp_air, &
516	flux_u1, flux_v1)
517
518	!****************************************************************************************
519	! 2) Update snow and ice surface
520	!****************************************************************************************
521	! snow precip
522	DO i=1,knon
523	ki=knindex(i)
524	IF (precip_snow(i) > 0.) THEN
525	snow(i) = snow(i)+precip_snow(i)dtime(1.-snow_wfact*(1.-fsic(ki)))
526	END IF
527	! snow and ice sublimation
528	IF (evap(i) > 0.) THEN
529	snow_evap = MIN (snow(i) / dtime, evap(i))
530	snow(i) = snow(i) - snow_evap * dtime
531	snow(i) = MAX(0.0, snow(i))
532	seaice(ki) = MAX(0.0,seaice(ki)-(evap(i)-snow_evap)*dtime)
533	ENDIF
534	! Melt / Freeze from above if Tsurf>0
535	IF (tsurf_new(i).GT.t_melt) THEN
536	! energy available for melting snow (in kg/m2 of snow)
537	e_melt = MIN(MAX(snow(i)(tsurf_new(i)-t_melt)ice_cap/2. &
538	/(ice_lat+ice_cap/2.*(t_melt-tice(ki))),0.0),snow(i))
539	! remove snow
540	IF (snow(i).GT.e_melt) THEN
541	snow(i)=snow(i)-e_melt
542	tsurf_new(i)=t_melt
543	ELSE ! all snow is melted
544	! add remaining heat flux to ice
545	e_melt=e_melt-snow(i)
546	tice(ki)=tice(ki)+e_meltice_lat2./(ice_cap*seaice(ki))
547	tsurf_new(i)=tice(ki)
548	END IF
549	END IF
550	! melt ice from above if Tice>0
551	IF (tice(ki).GT.t_melt) THEN
552	! quantity of ice melted (kg/m2)
553	e_melt=MAX(seaice(ki)(tice(ki)-t_melt)ice_cap/2. &
554	/(ice_lat+ice_cap/2.*(t_melt-t_freeze)),0.0)
555	! melt from above, height only
556	dhsic=MIN(seaice(ki)-h_ice_min,e_melt)
557	e_melt=e_melt-dhsic
558	IF (e_melt.GT.0) THEN
559	! lateral melt if ice too thin
560	dfsic=MAX(fsic(ki)-ice_frac_min,e_melt/h_ice_min*fsic(ki))
561	! if all melted add remaining heat to ocean
562	e_melt=MAX(0.,e_meltfsic(ki)-dfsich_ice_min)
563	slab_bilg(ki)=slab_bilg(ki)+ e_melt*ice_lat/dtime
564	! update height and fraction
565	fsic(ki)=fsic(ki)-dfsic
566	END IF
567	seaice(ki)=seaice(ki)-dhsic
568	! surface temperature at melting point
569	tice(ki)=t_melt
570	tsurf_new(i)=t_melt
571	END IF
572	! convert snow to ice if below floating line
573	h_test=(seaice(ki)+snow(i))ice_den-seaice(ki)sea_den
574	IF (h_test.GT.0.) THEN !snow under water
575	! extra snow converted to ice (with added frozen sea water)
576	dhsic=h_test/(sea_den-ice_den+sno_den)
577	seaice(ki)=seaice(ki)+dhsic
578	snow(i)=snow(i)-dhsic*sno_den/ice_den
579	! available energy (freeze sea water + bring to tice)
580	e_melt=dhsic(1.-sno_den/ice_den)(ice_lat+ &
581	ice_cap/2.*(t_freeze-tice(ki)))
582	! update ice temperature
583	tice(ki)=tice(ki)+2.*e_melt/ice_cap/(snow(i)+seaice(ki))
584	END IF
585	END DO
586
587	! New albedo
588	DO i=1,knon
589	ki=knindex(i)
590	! snow albedo: update snow age
591	IF (snow(i).GT.0.0001) THEN
592	agesno(i)=(agesno(i) + (1.-agesno(i)/50.)*dtime/86400.)&
593	* EXP(-1.MAX(0.0,precip_snow(i))dtime/5.)
594	ELSE
595	agesno(i)=0.0
596	END IF
597	! snow albedo
598	alb_snow=alb_sno_min+alb_sno_del*EXP(-agesno(i)/50.)
599	! ice albedo (varies with ice tkickness and temp)
600	alb_ice=MAX(0.0,0.13LOG(100.seaice(ki)/ice_den)+0.1)
601	IF (tice(ki).GT.t_freeze-0.01) THEN
602	alb_ice=MIN(alb_ice,alb_ice_wet)
603	ELSE
604	alb_ice=MIN(alb_ice,alb_ice_dry)
605	END IF
606	! pond albedo
607	alb_pond=0.36-0.1*(2.0+MIN(0.0,MAX(tice(ki)-t_melt,-2.0)))
608	! pond fraction
609	frac_pond=0.2*(2.0+MIN(0.0,MAX(tice(ki)-t_melt,-2.0)))
610	! snow fraction
611	frac_snow=MAX(0.0,MIN(1.0-frac_pond,snow(i)/snow_min))
612	! ice fraction
613	frac_ice=MAX(0.0,1.-frac_pond-frac_snow)
614	! total albedo
615	alb1_new(i)=alb_snowfrac_snow+alb_icefrac_ice+alb_pond*frac_pond
616	END DO
617	alb2_new(:) = alb1_new(:)
618
619	!****************************************************************************************
620	! 3) Recalculate new ocean temperature (add fluxes below ice)
621	! Melt / freeze from below
622	!*********************************************o***************************************
623	!cumul fluxes
624	bilg_cum(:)=bilg_cum(:)+slab_bilg(:)
625	IF (MOD(itime,cpl_pas).EQ.0) THEN ! time to update tslab & fraction
626	! Add cumulated surface fluxes
627	tslab(:,1)=tslab(:,1)+bilg_cum(:)cyangdtime
628	DO i=1,knon
629	ki=knindex(i)
630	! split lateral/top melt-freeze
631	frac_mf=MIN(1.,MAX(0.,(seaice(ki)-h_ice_thin)/(h_ice_thick-h_ice_thin)))
632	IF (tslab(ki,1).LE.t_freeze) THEN
633	! **** Form new ice from below *****
634	! quantity of new ice
635	e_melt=(t_freeze-tslab(ki,1))/cyang &
636	/(ice_lat+ice_cap/2.*(t_freeze-tice(ki)))
637	! first increase height to h_thin
638	dhsic=MAX(0.,MIN(h_ice_thin-seaice(ki),e_melt/fsic(ki)))
639	seaice(ki)=dhsic+seaice(ki)
640	e_melt=e_melt-fsic(ki)*dhsic
641	IF (e_melt.GT.0.) THEN
642	! frac_mf fraction used for lateral increase
643	dfsic=MIN(ice_frac_max-fsic(ki),e_melt*frac_mf/seaice(ki))
644	fsic(ki)=fsic(ki)+dfsic
645	e_melt=e_melt-dfsic*seaice(ki)
646	! rest used to increase height
647	seaice(ki)=MIN(h_ice_max,seaice(ki)+e_melt/fsic(ki))
648	END IF
649	tslab(ki,1)=t_freeze
650	ELSE ! slab temperature above freezing
651	! **** melt ice from below *****
652	! quantity of melted ice
653	e_melt=(tslab(ki,1)-t_freeze)/cyang &
654	/(ice_lat+ice_cap/2.*(tice(ki)-t_freeze))
655	! first decrease height to h_thick
656	dhsic=MAX(0.,MIN(seaice(ki)-h_ice_thick,e_melt/fsic(ki)))
657	seaice(ki)=seaice(ki)-dhsic
658	e_melt=e_melt-fsic(ki)*dhsic
659	IF (e_melt.GT.0) THEN
660	! frac_mf fraction used for height decrease
661	dhsic=MAX(0.,MIN(seaice(ki)-h_ice_min,e_melt*frac_mf/fsic(ki)))
662	seaice(ki)=seaice(ki)-dhsic
663	e_melt=e_melt-fsic(ki)*dhsic
664	! rest used to decrease fraction (up to 0!)
665	dfsic=MIN(fsic(ki),e_melt/seaice(ki))
666	! keep remaining in ocean
667	e_melt=e_melt-dfsic*seaice(ki)
668	END IF
669	tslab(ki,1)=t_freeze+e_meltice_latcyang
670	fsic(ki)=fsic(ki)-dfsic
671	END IF
672	END DO
673	bilg_cum(:)=0.
674	END IF ! coupling time
675
676	!tests fraction glace
677	WHERE (fsic.LT.ice_frac_min)
678	tslab(:,1)=tslab(:,1)-fsicseaiceice_lat*cyang
679	tice=t_melt
680	fsic=0.
681	seaice=0.
682	END WHERE
683
684	END SUBROUTINE ocean_slab_ice
685	!
686	!****************************************************************************************
687	!
688	SUBROUTINE ocean_slab_final
689
690	!****************************************************************************************
691	! Deallocate module variables
692	!****************************************************************************************
693	IF (ALLOCATED(tslab)) DEALLOCATE(tslab)
694	IF (ALLOCATED(fsic)) DEALLOCATE(fsic)
695	IF (ALLOCATED(slab_bils)) DEALLOCATE(slab_bils)
696	IF (ALLOCATED(slab_bilg)) DEALLOCATE(slab_bilg)
697	IF (ALLOCATED(bilg_cum)) DEALLOCATE(bilg_cum)
698	IF (ALLOCATED(bils_cum)) DEALLOCATE(bils_cum)
699	IF (ALLOCATED(tslab)) DEALLOCATE(tslab)
700
701	END SUBROUTINE ocean_slab_final
702
703	END MODULE ocean_slab_mod

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