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ocean_slab_mod.F90 @ 2337

Last change on this file since 2337 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

Rev	Line
[781]	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	!
[2073]	7
	8	USE dimphy
	9	USE indice_sol_mod
[2220]	10	USE surface_data
[2073]	11
[781]	12	IMPLICIT NONE
[996]	13	PRIVATE
[2220]	14	PUBLIC :: ocean_slab_init, ocean_slab_frac, ocean_slab_noice, ocean_slab_ice
[781]	15
[2220]	16	!****************************************************************************************
	17	! Global saved variables
	18	!****************************************************************************************
	19
[2073]	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)
[2220]	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	!$OMP THREADPRIVATE(seaice)
[2073]	34	REAL, ALLOCATABLE, DIMENSION(:), PUBLIC, SAVE :: slab_bils
	35	!$OMP THREADPRIVATE(slab_bils)
	36	REAL, ALLOCATABLE, DIMENSION(:), PRIVATE, SAVE :: bils_cum
	37	!$OMP THREADPRIVATE(bils_cum)
[2220]	38	REAL, ALLOCATABLE, DIMENSION(:), PUBLIC, SAVE :: slab_bilg
	39	!$OMP THREADPRIVATE(slab_bilg)
	40	REAL, ALLOCATABLE, DIMENSION(:), PRIVATE, SAVE :: bilg_cum
	41	!$OMP THREADPRIVATE(bilg_cum)
[2073]	42
[2220]	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
[781]	81	CONTAINS
	82	!
	83	!****************************************************************************************
	84	!
[2073]	85	SUBROUTINE ocean_slab_init(dtime, pctsrf_rst)
	86	!, seaice_rst etc
[781]	87
[2073]	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	!****************************************************************************************
[2220]	109	ALLOCATE(fsic(klon), stat = error)
[2073]	110	IF (error /= 0) THEN
	111	abort_message='Pb allocation tmp_pctsrf_slab'
	112	CALL abort_gcm(modname,abort_message,1)
	113	ENDIF
[2220]	114	fsic(:)=0.
	115	WHERE (1.-zmasq(:)>EPSFRA)
	116	fsic(:) = pctsrf_rst(:,is_sic)/(1.-zmasq(:))
	117	END WHERE
[2073]	118
	119	!****************************************************************************************
[2220]	120	! Allocate saved variables
[2073]	121	!****************************************************************************************
[2220]	122	ALLOCATE(tslab(klon,nslay), stat=error)
	123	IF (error /= 0) CALL abort_gcm &
	124	(modname,'pb allocation tslab', 1)
	125
[2073]	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
[2220]	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	!****************************************************************************************
[2073]	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
[2220]	182
[2073]	183	END SUBROUTINE ocean_slab_init
	184	!
	185	!****************************************************************************************
	186	!
	187	SUBROUTINE ocean_slab_frac(itime, dtime, jour, pctsrf_chg, is_modified)
	188
[996]	189	USE limit_read_mod
[1795]	190
[996]	191	! INCLUDE "clesphys.h"
[781]	192
[996]	193	! Arguments
[781]	194	!****************************************************************************************
[996]	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)
[2073]	198	REAL, DIMENSION(klon,nbsrf), INTENT(INOUT) :: pctsrf_chg ! sub-surface fraction
[996]	199	LOGICAL, INTENT(OUT) :: is_modified ! true if pctsrf is modified at this time step
[781]	200
	201	! Local variables
	202	!****************************************************************************************
	203
[2073]	204	IF (version_ocean == 'sicOBS'.OR. version_ocean == 'sicNO') THEN
	205	CALL limit_read_frac(itime, dtime, jour, pctsrf_chg, is_modified)
[996]	206	ELSE
[2220]	207	pctsrf_chg(:,is_oce)=(1.-fsic(:))*(1.-zmasq(:))
	208	pctsrf_chg(:,is_sic)=fsic(:)*(1.-zmasq(:))
[2073]	209	is_modified=.TRUE.
[996]	210	END IF
[781]	211
[996]	212	END SUBROUTINE ocean_slab_frac
[781]	213	!
	214	!****************************************************************************************
	215	!
	216	SUBROUTINE ocean_slab_noice( &
[996]	217	itime, dtime, jour, knon, knindex, &
[2298]	218	p1lay, cdragh, cdragq, cdragm, precip_rain, precip_snow, temp_air, spechum, &
[1067]	219	AcoefH, AcoefQ, BcoefH, BcoefQ, &
	220	AcoefU, AcoefV, BcoefU, BcoefV, &
[2298]	221	ps, u1, v1, gustiness, tsurf_in, &
[2220]	222	radsol, snow, &
[1067]	223	qsurf, evap, fluxsens, fluxlat, flux_u1, flux_v1, &
[2073]	224	tsurf_new, dflux_s, dflux_l, qflux)
[1067]	225
	226	USE calcul_fluxs_mod
[1795]	227
[781]	228	INCLUDE "iniprint.h"
[2298]	229	INCLUDE "clesphys.h"
[781]	230
	231	! Input arguments
	232	!****************************************************************************************
[996]	233	INTEGER, INTENT(IN) :: itime
	234	INTEGER, INTENT(IN) :: jour
[781]	235	INTEGER, INTENT(IN) :: knon
	236	INTEGER, DIMENSION(klon), INTENT(IN) :: knindex
	237	REAL, INTENT(IN) :: dtime
	238	REAL, DIMENSION(klon), INTENT(IN) :: p1lay
[2298]	239	REAL, DIMENSION(klon), INTENT(IN) :: cdragh, cdragq, cdragm
[781]	240	REAL, DIMENSION(klon), INTENT(IN) :: precip_rain, precip_snow
	241	REAL, DIMENSION(klon), INTENT(IN) :: temp_air, spechum
[1067]	242	REAL, DIMENSION(klon), INTENT(IN) :: AcoefH, AcoefQ, BcoefH, BcoefQ
	243	REAL, DIMENSION(klon), INTENT(IN) :: AcoefU, AcoefV, BcoefU, BcoefV
[781]	244	REAL, DIMENSION(klon), INTENT(IN) :: ps
[2298]	245	REAL, DIMENSION(klon), INTENT(IN) :: u1, v1, gustiness
[996]	246	REAL, DIMENSION(klon), INTENT(IN) :: tsurf_in
[2220]	247	REAL, DIMENSION(klon), INTENT(INOUT) :: radsol
[781]	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
[1067]	257	REAL, DIMENSION(klon), INTENT(OUT) :: flux_u1, flux_v1
[781]	258	REAL, DIMENSION(klon), INTENT(OUT) :: tsurf_new
	259	REAL, DIMENSION(klon), INTENT(OUT) :: dflux_s, dflux_l
[2073]	260	REAL, DIMENSION(klon), INTENT(OUT) :: qflux
[781]	261
	262	! Local variables
	263	!****************************************************************************************
[2073]	264	INTEGER :: i,ki
[2220]	265	! surface fluxes
[996]	266	REAL, DIMENSION(klon) :: cal, beta, dif_grnd
[2220]	267	! flux correction
	268	REAL, DIMENSION(klon) :: diff_sst, diff_siv, lmt_bils
	269	! surface wind stress
[1067]	270	REAL, DIMENSION(klon) :: u0, v0
	271	REAL, DIMENSION(klon) :: u1_lay, v1_lay
[2220]	272	! ice creation
	273	REAL :: e_freeze, h_new, dfsic
[781]	274
	275	!****************************************************************************************
[996]	276	! 1) Flux calculation
	277	!
	278	!****************************************************************************************
	279	cal(:) = 0.
	280	beta(:) = 1.
	281	dif_grnd(:) = 0.
[781]	282
[1067]	283	! Suppose zero surface speed
	284	u0(:)=0.0
	285	v0(:)=0.0
	286	u1_lay(:) = u1(:) - u0(:)
	287	v1_lay(:) = v1(:) - v0(:)
	288
[781]	289	CALL calcul_fluxs(knon, is_oce, dtime, &
[2298]	290	tsurf_in, p1lay, cal, beta, cdragh, cdragq, ps, &
[781]	291	precip_rain, precip_snow, snow, qsurf, &
[2298]	292	radsol, dif_grnd, temp_air, spechum, u1_lay, v1_lay, gustiness, &
	293	f_qsat_oce,AcoefH, AcoefQ, BcoefH, BcoefQ, &
[781]	294	tsurf_new, evap, fluxlat, fluxsens, dflux_s, dflux_l)
	295
[1067]	296	! - Flux calculation at first modele level for U and V
	297	CALL calcul_flux_wind(knon, dtime, &
[2298]	298	u0, v0, u1, v1, gustiness, cdragm, &
[1067]	299	AcoefU, AcoefV, BcoefU, BcoefV, &
	300	p1lay, temp_air, &
	301	flux_u1, flux_v1)
	302
[2073]	303	! Accumulate total fluxes locally
	304	slab_bils(:)=0.
	305	DO i=1,knon
	306	ki=knindex(i)
[2220]	307	slab_bils(ki)=(1.-fsic(ki))*(fluxlat(i)+fluxsens(i)+radsol(i) &
	308	-precip_snow(i)ice_lat(1.+snow_wfact*fsic(ki)))
[2073]	309	bils_cum(ki)=bils_cum(ki)+slab_bils(ki)
	310	! Also taux, tauy, saved vars...
	311	END DO
	312
[781]	313	!****************************************************************************************
[2073]	314	! 2) Get global variables lmt_bils and diff_sst from file limit_slab.nc
[781]	315	!
	316	!****************************************************************************************
[2073]	317	lmt_bils(:)=0.
[2220]	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.
[2073]	321	! qflux = total QFlux correction (in W/m2)
[781]	322
	323	!****************************************************************************************
[996]	324	! 3) Recalculate new temperature
[781]	325	!
[2073]	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
[2220]	341	CASE('sicOBS') ! check for sea ice or tslab below freezing
[2073]	342	DO i=1,knon
	343	ki=knindex(i)
[2220]	344	IF ((tslab(ki,1).LT.t_freeze).OR.(fsic(ki).GT.epsfra)) THEN
[2073]	345	tslab(ki,1)=t_freeze
	346	END IF
[2220]	347	tsurf_new(i)=tslab(ki,1)
[2073]	348	END DO
	349	CASE('sicINT')
	350	DO i=1,knon
	351	ki=knindex(i)
[2220]	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
[2073]	367	tsurf_new(i)=tslab(ki,1)
[2220]	368	END IF
	369	ELSE ! ice present
[2073]	370	tsurf_new(i)=t_freeze
[2220]	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
[2073]	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	!
[781]	394	!****************************************************************************************
[2220]	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, &
[2298]	401	ps, u1, v1, gustiness, &
[2220]	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"
[2298]	409	INCLUDE "clesphys.h"
[2220]	410
	411	! Input arguments
[2073]	412	!****************************************************************************************
[2220]	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
[2298]	424	REAL, DIMENSION(klon), INTENT(IN) :: u1, v1, gustiness
[2220]	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	!****************************************************************************************
[2073]	460	! 1) Flux calculation
	461	!****************************************************************************************
[2220]	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
[2073]	500	! calcul_fluxs (sens, lat etc)
[2220]	501	CALL calcul_fluxs(knon, is_sic, dtime, &
[2298]	502	tsurf_in, p1lay, cal, beta, cdragh, cdragh, ps, &
[2220]	503	precip_rain, precip_snow, snow, qsurf, &
[2298]	504	radsol, dif_grnd, temp_air, spechum, u1_lay, v1_lay, gustiness, &
	505	f_qsat_oce,AcoefH, AcoefQ, BcoefH, BcoefQ, &
[2220]	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
[2073]	511	! calcul_flux_wind
[2220]	512	CALL calcul_flux_wind(knon, dtime, &
[2298]	513	u0, v0, u1, v1, gustiness, cdragm, &
[2220]	514	AcoefU, AcoefV, BcoefU, BcoefV, &
	515	p1lay, temp_air, &
	516	flux_u1, flux_v1)
[781]	517
[2073]	518	!****************************************************************************************
[2220]	519	! 2) Update snow and ice surface
[2073]	520	!****************************************************************************************
[2220]	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
[2073]	587	! New albedo
[2220]	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(:)
[2073]	618
	619	!****************************************************************************************
[2220]	620	! 3) Recalculate new ocean temperature (add fluxes below ice)
[2073]	621	! Melt / freeze from below
	622	!*********************************************o***************************************
[2220]	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
[2073]	683
[2220]	684	END SUBROUTINE ocean_slab_ice
[781]	685	!
	686	!****************************************************************************************
	687	!
[2073]	688	SUBROUTINE ocean_slab_final
	689
	690	!****************************************************************************************
	691	! Deallocate module variables
	692	!****************************************************************************************
	693	IF (ALLOCATED(tslab)) DEALLOCATE(tslab)
[2220]	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)
[2073]	700
	701	END SUBROUTINE ocean_slab_final
	702
[781]	703	END MODULE ocean_slab_mod

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