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limthd_lac.F90 in branches/2017/dev_r8183_ICEMODEL/NEMOGCM/NEMO/LIM_SRC_3 – NEMO

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source: branches/2017/dev_r8183_ICEMODEL/NEMOGCM/NEMO/LIM_SRC_3/limthd_lac.F90 @ 8379

Last change on this file since 8379 was 8379, checked in by clem, 7 years ago
more cleaning
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[825]	1	MODULE limthd_lac
	2	!!======================================================================
	3	!! * MODULE limthd_lac *
	4	!! lateral thermodynamic growth of the ice
	5	!!======================================================================
[2715]	6	!! History : LIM ! 2005-12 (M. Vancoppenolle) Original code
	7	!! - ! 2006-01 (M. Vancoppenolle) add ITD
	8	!! 3.0 ! 2007-07 (M. Vancoppenolle) Mass and energy conservation tested
	9	!! 4.0 ! 2011-02 (G. Madec) dynamical allocation
	10	!!----------------------------------------------------------------------
[888]	11	#if defined key_lim3
[825]	12	!!----------------------------------------------------------------------
[2528]	13	!! 'key_lim3' LIM3 sea-ice model
	14	!!----------------------------------------------------------------------
[3625]	15	!! lim_lat_acr : lateral accretion of ice
[2528]	16	!!----------------------------------------------------------------------
[3625]	17	USE par_oce ! ocean parameters
	18	USE dom_oce ! domain variables
	19	USE phycst ! physical constants
[8316]	20	USE sbc_oce , ONLY : sss_m
	21	USE sbc_ice , ONLY : utau_ice, vtau_ice
[3625]	22	USE thd_ice ! LIM thermodynamics
	23	USE ice ! LIM variables
	24	USE limtab ! LIM 2D <==> 1D
	25	USE limcons ! LIM conservation
[8378]	26	USE limthd_ent
	27	USE limvar
	28	!
[3625]	29	USE in_out_manager ! I/O manager
	30	USE lib_mpp ! MPP library
[4833]	31	USE lbclnk ! ocean lateral boundary conditions (or mpp link)
[3625]	32	USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined)
[921]	33
[825]	34	IMPLICIT NONE
	35	PRIVATE
	36
	37	PUBLIC lim_thd_lac ! called by lim_thd
	38
	39	!!----------------------------------------------------------------------
[4161]	40	!! NEMO/LIM3 4.0 , UCL - NEMO Consortium (2011)
[1156]	41	!! $Id$
[2715]	42	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[825]	43	!!----------------------------------------------------------------------
	44	CONTAINS
[921]	45
[825]	46	SUBROUTINE lim_thd_lac
	47	!!-------------------------------------------------------------------
	48	!! * ROUTINE lim_thd_lac *
	49	!!
	50	!! ** Purpose : Computation of the evolution of the ice thickness and
	51	!! concentration as a function of the heat balance in the leads.
	52	!! It is only used for lateral accretion
	53	!!
	54	!! ** Method : Ice is formed in the open water when ocean lose heat
	55	!! (heat budget of open water Bl is negative) .
	56	!! Computation of the increase of 1-A (ice concentration) fol-
	57	!! lowing the law :
	58	!! (dA/dt)acc = F[ (1-A)/(1-a) ] * [ Bl / (Li*h0) ]
	59	!! where - h0 is the thickness of ice created in the lead
	60	!! - a is a minimum fraction for leads
	61	!! - F is a monotonic non-increasing function defined as:
	62	!! F(X)=( 1 - Xexld )(1.0/exld)
	63	!! - exld is the exponent closure rate (=2 default val.)
	64	!!
	65	!! ** Action : - Adjustment of snow and ice thicknesses and heat
	66	!! content in brine pockets
	67	!! - Updating ice internal temperature
	68	!! - Computation of variation of ice volume and mass
[8313]	69	!! - Computation of a_i after lateral accretion and
[4872]	70	!! update ht_s_1d, ht_i_1d and tbif_1d(:,:)
[825]	71	!!------------------------------------------------------------------------
[7646]	72	INTEGER :: ji,jj,jk,jl ! dummy loop indices
[8327]	73	INTEGER :: iter ! - -
[7646]	74	REAL(wp) :: ztmelts, zdv, zfrazb, zweight, zde ! local scalars
[6416]	75	REAL(wp) :: zgamafr, zvfrx, zvgx, ztaux, ztwogp, zf ! - -
[2715]	76	REAL(wp) :: ztenagm, zvfry, zvgy, ztauy, zvrel2, zfp, zsqcd , zhicrit ! - -
[4688]	77
	78	REAL(wp) :: zQm ! enthalpy exchanged with the ocean (J/m2, >0 towards ocean)
	79	REAL(wp) :: zEi ! sea ice specific enthalpy (J/kg)
	80	REAL(wp) :: zEw ! seawater specific enthalpy (J/kg)
	81	REAL(wp) :: zfmdt ! mass flux x time step (kg/m2, >0 towards ocean)
	82
	83	REAL(wp) :: zv_newfra
[8379]	84	REAL(wp) :: zvi_b, zsmv_b, zei_b, zfs_b, zfw_b, zft_b ! conservation check
[4688]	85
[8373]	86	INTEGER , DIMENSION(jpij) :: jcat ! indexes of categories where new ice grows
	87	REAL(wp), DIMENSION(jpij) :: zswinew ! switch for new ice or not
[825]	88
[8373]	89	REAL(wp), DIMENSION(jpij) :: zv_newice ! volume of accreted ice
	90	REAL(wp), DIMENSION(jpij) :: za_newice ! fractional area of accreted ice
	91	REAL(wp), DIMENSION(jpij) :: zh_newice ! thickness of accreted ice
	92	REAL(wp), DIMENSION(jpij) :: ze_newice ! heat content of accreted ice
	93	REAL(wp), DIMENSION(jpij) :: zs_newice ! salinity of accreted ice
	94	REAL(wp), DIMENSION(jpij) :: zo_newice ! age of accreted ice
	95	REAL(wp), DIMENSION(jpij) :: zdv_res ! residual volume in case of excessive heat budget
	96	REAL(wp), DIMENSION(jpij) :: zda_res ! residual area in case of excessive heat budget
	97	REAL(wp), DIMENSION(jpij) :: zat_i_1d ! total ice fraction
	98	REAL(wp), DIMENSION(jpij) :: zv_frazb ! accretion of frazil ice at the ice bottom
	99	REAL(wp), DIMENSION(jpij) :: zvrel_1d ! relative ice / frazil velocity (1D vector)
[825]	100
[8373]	101	REAL(wp), DIMENSION(jpij,jpl) :: zv_b ! old volume of ice in category jl
	102	REAL(wp), DIMENSION(jpij,jpl) :: za_b ! old area of ice in category jl
	103	REAL(wp), DIMENSION(jpij,jpl) :: za_i_1d ! 1-D version of a_i
	104	REAL(wp), DIMENSION(jpij,jpl) :: zv_i_1d ! 1-D version of v_i
	105	REAL(wp), DIMENSION(jpij,jpl) :: zsmv_i_1d ! 1-D version of smv_i
[825]	106
[8373]	107	REAL(wp), DIMENSION(jpij,nlay_i,jpl) :: ze_i_1d !: 1-D version of e_i
[825]	108
[8373]	109	REAL(wp), DIMENSION(jpi,jpj) :: zvrel ! relative ice / frazil velocity
[5123]	110
[6416]	111	REAL(wp) :: zcai = 1.4e-3_wp ! ice-air drag (clem: should be dependent on coupling/forcing used)
[3294]	112	!!-----------------------------------------------------------------------!
[825]	113
[8379]	114	IF( ln_limdiachk ) CALL lim_cons_hsm(0, 'limthd_lac', zvi_b, zsmv_b, zei_b, zfw_b, zfs_b, zft_b)
	115
[5167]	116	CALL lim_var_agg(1)
	117	CALL lim_var_glo2eqv
[825]	118
[921]	119	!------------------------------------------------------------------------------!
	120	! 3) Collection thickness of ice formed in leads and polynyas
	121	!------------------------------------------------------------------------------!
[865]	122	! hicol is the thickness of new ice formed in open water
[6416]	123	! hicol can be either prescribed (frazswi = 0) or computed (frazswi = 1)
[825]	124	! Frazil ice forms in open water, is transported by wind
	125	! accumulates at the edge of the consolidated ice edge
	126	! where it forms aggregates of a specific thickness called
	127	! collection thickness.
	128
[865]	129	! Note : the following algorithm currently breaks vectorization
	130	!
	131
[7753]	132	zvrel(:,:) = 0._wp
[825]	133
[7753]	134	! Default new ice thickness
	135	WHERE( qlead(:,:) < 0._wp ) ; hicol(:,:) = rn_hnewice
	136	ELSEWHERE ; hicol(:,:) = 0._wp
	137	END WHERE
[825]	138
[5123]	139	IF( ln_frazil ) THEN
[825]	140
[921]	141	!--------------------
	142	! Physical constants
	143	!--------------------
[7753]	144	hicol(:,:) = 0._wp
[825]	145
[921]	146	zhicrit = 0.04 ! frazil ice thickness
	147	ztwogp = 2. * rau0 / ( grav * 0.3 * ( rau0 - rhoic ) ) ! reduced grav
[5123]	148	zsqcd = 1.0 / SQRT( 1.3 * zcai ) ! 1/SQRT(airdensity*drag)
[921]	149	zgamafr = 0.03
[825]	150
[7646]	151	DO jj = 2, jpjm1
	152	DO ji = 2, jpim1
	153	IF ( qlead(ji,jj) < 0._wp .AND. tau_icebfr(ji,jj) == 0._wp ) THEN ! activated if cooling and no landfast
[921]	154	!-------------
	155	! Wind stress
	156	!-------------
	157	! C-grid wind stress components
[5123]	158	ztaux = ( utau_ice(ji-1,jj ) * umask(ji-1,jj ,1) &
	159	& + utau_ice(ji ,jj ) * umask(ji ,jj ,1) ) * 0.5_wp
	160	ztauy = ( vtau_ice(ji ,jj-1) * vmask(ji ,jj-1,1) &
	161	& + vtau_ice(ji ,jj ) * vmask(ji ,jj ,1) ) * 0.5_wp
[921]	162	! Square root of wind stress
[6416]	163	ztenagm = SQRT( SQRT( ztaux * ztaux + ztauy * ztauy ) )
[825]	164
[921]	165	!---------------------
	166	! Frazil ice velocity
	167	!---------------------
[4990]	168	rswitch = MAX( 0._wp, SIGN( 1._wp , ztenagm - epsi10 ) )
	169	zvfrx = rswitch * zgamafr * zsqcd * ztaux / MAX( ztenagm, epsi10 )
	170	zvfry = rswitch * zgamafr * zsqcd * ztauy / MAX( ztenagm, epsi10 )
[825]	171
[921]	172	!-------------------
	173	! Pack ice velocity
	174	!-------------------
	175	! C-grid ice velocity
[7646]	176	zvgx = ( u_ice(ji-1,jj ) * umask(ji-1,jj ,1) + u_ice(ji,jj) * umask(ji,jj,1) ) * 0.5_wp
	177	zvgy = ( v_ice(ji ,jj-1) * vmask(ji ,jj-1,1) + v_ice(ji,jj) * vmask(ji,jj,1) ) * 0.5_wp
[825]	178
[921]	179	!-----------------------------------
	180	! Relative frazil/pack ice velocity
	181	!-----------------------------------
	182	! absolute relative velocity
[7646]	183	rswitch = MAX( 0._wp, SIGN( 1._wp , at_i(ji,jj) - epsi10 ) )
	184	zvrel2 = MAX( ( zvfrx - zvgx ) * ( zvfrx - zvgx ) &
	185	& + ( zvfry - zvgy ) * ( zvfry - zvgy ) , 0.15 * 0.15 ) * rswitch
[6416]	186	zvrel(ji,jj) = SQRT( zvrel2 )
[825]	187
[921]	188	!---------------------
	189	! Iterative procedure
	190	!---------------------
[6416]	191	hicol(ji,jj) = zhicrit + ( zhicrit + 0.1 ) &
	192	& / ( ( zhicrit + 0.1 ) * ( zhicrit + 0.1 ) - zhicrit * zhicrit ) * ztwogp * zvrel2
[825]	193
[921]	194	iter = 1
[6416]	195	DO WHILE ( iter < 20 )
	196	zf = ( hicol(ji,jj) - zhicrit ) * ( hicol(ji,jj) * hicol(ji,jj) - zhicrit * zhicrit ) - &
	197	& hicol(ji,jj) * zhicrit * ztwogp * zvrel2
	198	zfp = ( hicol(ji,jj) - zhicrit ) * ( 3.0 * hicol(ji,jj) + zhicrit ) - zhicrit * ztwogp * zvrel2
[825]	199
[7646]	200	hicol(ji,jj) = hicol(ji,jj) - zf / MAX( zfp, epsi20 )
[921]	201	iter = iter + 1
[6416]	202	END DO
[825]	203
[921]	204	ENDIF ! end of selection of pixels where ice forms
[825]	205
[6416]	206	END DO
	207	END DO
	208	!
[8373]	209	CALL lbc_lnk_multi( zvrel, 'T', 1., hicol, 'T', 1. )
[825]	210
	211	ENDIF ! End of computation of frazil ice collection thickness
	212
[921]	213	!------------------------------------------------------------------------------!
	214	! 4) Identify grid points where new ice forms
	215	!------------------------------------------------------------------------------!
[825]	216
	217	!-------------------------------------
	218	! Select points for new ice formation
	219	!-------------------------------------
[7646]	220	! This occurs if open water energy budget is negative (cooling) and there is no landfast ice
[8327]	221	nidx = 0 ; idxice(:) = 0
[8332]	222	DO jj = 1, jpj
	223	DO ji = 1, jpi
[7646]	224	IF ( qlead(ji,jj) < 0._wp .AND. tau_icebfr(ji,jj) == 0._wp ) THEN
[8327]	225	nidx = nidx + 1
	226	idxice( nidx ) = (jj - 1) * jpi + ji
[825]	227	ENDIF
	228	END DO
	229	END DO
	230
	231	!------------------------------
	232	! Move from 2-D to 1-D vectors
	233	!------------------------------
[6416]	234	! If ocean gains heat do nothing. Otherwise compute new ice formation
[825]	235
[8327]	236	IF ( nidx > 0 ) THEN
[825]	237
[8342]	238	CALL tab_2d_1d( nidx, idxice(1:nidx), zat_i_1d (1:nidx) , at_i )
[921]	239	DO jl = 1, jpl
[8342]	240	CALL tab_2d_1d( nidx, idxice(1:nidx), za_i_1d (1:nidx,jl), a_i (:,:,jl) )
	241	CALL tab_2d_1d( nidx, idxice(1:nidx), zv_i_1d (1:nidx,jl), v_i (:,:,jl) )
	242	CALL tab_2d_1d( nidx, idxice(1:nidx), zsmv_i_1d(1:nidx,jl), smv_i(:,:,jl) )
[921]	243	DO jk = 1, nlay_i
[8342]	244	CALL tab_2d_1d( nidx, idxice(1:nidx), ze_i_1d(1:nidx,jk,jl), e_i(:,:,jk,jl) )
[5202]	245	END DO
	246	END DO
[825]	247
[8342]	248	CALL tab_2d_1d( nidx, idxice(1:nidx), qlead_1d (1:nidx) , qlead )
	249	CALL tab_2d_1d( nidx, idxice(1:nidx), t_bo_1d (1:nidx) , t_bo )
	250	CALL tab_2d_1d( nidx, idxice(1:nidx), sfx_opw_1d(1:nidx) , sfx_opw )
	251	CALL tab_2d_1d( nidx, idxice(1:nidx), wfx_opw_1d(1:nidx) , wfx_opw )
	252	CALL tab_2d_1d( nidx, idxice(1:nidx), hicol_1d (1:nidx) , hicol )
	253	CALL tab_2d_1d( nidx, idxice(1:nidx), zvrel_1d (1:nidx) , zvrel )
[834]	254
[8342]	255	CALL tab_2d_1d( nidx, idxice(1:nidx), hfx_thd_1d(1:nidx) , hfx_thd )
	256	CALL tab_2d_1d( nidx, idxice(1:nidx), hfx_opw_1d(1:nidx) , hfx_opw )
	257	CALL tab_2d_1d( nidx, idxice(1:nidx), rn_amax_1d(1:nidx) , rn_amax_2d )
	258	CALL tab_2d_1d( nidx, idxice(1:nidx), sss_1d (1:nidx) , sss_m )
[4688]	259
[8327]	260	!------------------------------------------------------------------------------\|
	261	! 2) Convert units for ice internal energy
	262	!------------------------------------------------------------------------------\|
	263	DO jl = 1, jpl
	264	DO jk = 1, nlay_i
	265	DO ji = 1, nidx
	266	IF( zv_i_1d(ji,jl) > 0._wp ) ze_i_1d(ji,jk,jl) = ze_i_1d(ji,jk,jl) / zv_i_1d(ji,jl) * REAL( nlay_i )
	267	END DO
	268	END DO
	269	END DO
[921]	270	!------------------------------------------------------------------------------!
	271	! 5) Compute thickness, salinity, enthalpy, age, area and volume of new ice
	272	!------------------------------------------------------------------------------!
[825]	273
[4688]	274	!-----------------------------------------
	275	! Keep old ice areas and volume in memory
	276	!-----------------------------------------
[8327]	277	zv_b(1:nidx,:) = zv_i_1d(1:nidx,:)
	278	za_b(1:nidx,:) = za_i_1d(1:nidx,:)
[6416]	279
[921]	280	!----------------------
	281	! Thickness of new ice
	282	!----------------------
[8327]	283	zh_newice(1:nidx) = hicol_1d(1:nidx)
[825]	284
[921]	285	!----------------------
	286	! Salinity of new ice
	287	!----------------------
[5123]	288	SELECT CASE ( nn_icesal )
[3625]	289	CASE ( 1 ) ! Sice = constant
[8327]	290	zs_newice(1:nidx) = rn_icesal
[3625]	291	CASE ( 2 ) ! Sice = F(z,t) [Vancoppenolle et al (2005)]
[8327]	292	DO ji = 1, nidx
	293	zs_newice(ji) = MIN( 4.606 + 0.91 / zh_newice(ji) , rn_simax , 0.5 * sss_1d(ji) )
[3625]	294	END DO
	295	CASE ( 3 ) ! Sice = F(z) [multiyear ice]
[8327]	296	zs_newice(1:nidx) = 2.3
[3625]	297	END SELECT
[825]	298
[921]	299	!-------------------------
	300	! Heat content of new ice
	301	!-------------------------
	302	! We assume that new ice is formed at the seawater freezing point
[8327]	303	DO ji = 1, nidx
[5123]	304	ztmelts = - tmut * zs_newice(ji) + rt0 ! Melting point (K)
[6416]	305	ze_newice(ji) = rhoic * ( cpic * ( ztmelts - t_bo_1d(ji) ) &
[5123]	306	& + lfus * ( 1.0 - ( ztmelts - rt0 ) / MIN( t_bo_1d(ji) - rt0, -epsi10 ) ) &
	307	& - rcp * ( ztmelts - rt0 ) )
	308	END DO
[4688]	309
[921]	310	!----------------
	311	! Age of new ice
	312	!----------------
[8327]	313	DO ji = 1, nidx
[3625]	314	zo_newice(ji) = 0._wp
[5202]	315	END DO
[825]	316
[921]	317	!-------------------
	318	! Volume of new ice
	319	!-------------------
[8327]	320	DO ji = 1, nidx
[825]	321
[5123]	322	zEi = - ze_newice(ji) * r1_rhoic ! specific enthalpy of forming ice [J/kg]
[4688]	323
[5123]	324	zEw = rcp * ( t_bo_1d(ji) - rt0 ) ! specific enthalpy of seawater at t_bo_1d [J/kg]
[4688]	325	! clem: we suppose we are already at the freezing point (condition qlead<0 is satisfyied)
	326
	327	zdE = zEi - zEw ! specific enthalpy difference [J/kg]
	328
	329	zfmdt = - qlead_1d(ji) / zdE ! Fm.dt [kg/m2] (<0)
	330	! clem: we use qlead instead of zqld (limthd) because we suppose we are at the freezing point
[5123]	331	zv_newice(ji) = - zfmdt * r1_rhoic
[4688]	332
	333	zQm = zfmdt * zEw ! heat to the ocean >0 associated with mass flux
	334
	335	! Contribution to heat flux to the ocean [W.m-2], >0
	336	hfx_thd_1d(ji) = hfx_thd_1d(ji) + zfmdt * zEw * r1_rdtice
	337	! Total heat flux used in this process [W.m-2]
	338	hfx_opw_1d(ji) = hfx_opw_1d(ji) - zfmdt * zdE * r1_rdtice
	339	! mass flux
	340	wfx_opw_1d(ji) = wfx_opw_1d(ji) - zv_newice(ji) * rhoic * r1_rdtice
	341	! salt flux
	342	sfx_opw_1d(ji) = sfx_opw_1d(ji) - zv_newice(ji) * rhoic * zs_newice(ji) * r1_rdtice
[6416]	343	END DO
	344
	345	zv_frazb(:) = 0._wp
	346	IF( ln_frazil ) THEN
[921]	347	! A fraction zfrazb of frazil ice is accreted at the ice bottom
[8327]	348	DO ji = 1, nidx
[6416]	349	rswitch = 1._wp - MAX( 0._wp, SIGN( 1._wp , - zat_i_1d(ji) ) )
	350	zfrazb = rswitch * ( TANH( rn_Cfrazb * ( zvrel_1d(ji) - rn_vfrazb ) ) + 1.0 ) * 0.5 * rn_maxfrazb
	351	zv_frazb(ji) = zfrazb * zv_newice(ji)
	352	zv_newice(ji) = ( 1.0 - zfrazb ) * zv_newice(ji)
	353	END DO
	354	END IF
	355
[921]	356	!-----------------
	357	! Area of new ice
	358	!-----------------
[8327]	359	DO ji = 1, nidx
[3625]	360	za_newice(ji) = zv_newice(ji) / zh_newice(ji)
[4688]	361	END DO
[825]	362
[921]	363	!------------------------------------------------------------------------------!
	364	! 6) Redistribute new ice area and volume into ice categories !
	365	!------------------------------------------------------------------------------!
[825]	366
[4688]	367	!------------------------
	368	! 6.1) lateral ice growth
	369	!------------------------
[921]	370	! If lateral ice growth gives an ice concentration gt 1, then
[3625]	371	! we keep the excessive volume in memory and attribute it later to bottom accretion
[8327]	372	DO ji = 1, nidx
[6403]	373	IF ( za_newice(ji) > ( rn_amax_1d(ji) - zat_i_1d(ji) ) ) THEN
	374	zda_res(ji) = za_newice(ji) - ( rn_amax_1d(ji) - zat_i_1d(ji) )
[3625]	375	zdv_res(ji) = zda_res (ji) * zh_newice(ji)
	376	za_newice(ji) = za_newice(ji) - zda_res (ji)
	377	zv_newice(ji) = zv_newice(ji) - zdv_res (ji)
[921]	378	ELSE
[3625]	379	zda_res(ji) = 0._wp
	380	zdv_res(ji) = 0._wp
[921]	381	ENDIF
[4688]	382	END DO
[825]	383
[4688]	384	! find which category to fill
	385	zat_i_1d(:) = 0._wp
[921]	386	DO jl = 1, jpl
[8327]	387	DO ji = 1, nidx
[4688]	388	IF( zh_newice(ji) > hi_max(jl-1) .AND. zh_newice(ji) <= hi_max(jl) ) THEN
	389	za_i_1d (ji,jl) = za_i_1d (ji,jl) + za_newice(ji)
	390	zv_i_1d (ji,jl) = zv_i_1d (ji,jl) + zv_newice(ji)
	391	jcat (ji) = jl
[921]	392	ENDIF
[4688]	393	zat_i_1d(ji) = zat_i_1d(ji) + za_i_1d (ji,jl)
[3625]	394	END DO
	395	END DO
[825]	396
[4688]	397	! Heat content
[8327]	398	DO ji = 1, nidx
[4688]	399	jl = jcat(ji) ! categroy in which new ice is put
[4872]	400	zswinew (ji) = MAX( 0._wp , SIGN( 1._wp , - za_b(ji,jl) ) ) ! 0 if old ice
[921]	401	END DO
[825]	402
[921]	403	DO jk = 1, nlay_i
[8327]	404	DO ji = 1, nidx
[4688]	405	jl = jcat(ji)
[4990]	406	rswitch = MAX( 0._wp, SIGN( 1._wp , zv_i_1d(ji,jl) - epsi20 ) )
[6416]	407	ze_i_1d(ji,jk,jl) = zswinew(ji) * ze_newice(ji) + &
[4872]	408	& ( 1.0 - zswinew(ji) ) * ( ze_newice(ji) * zv_newice(ji) + ze_i_1d(ji,jk,jl) * zv_b(ji,jl) ) &
[4990]	409	& * rswitch / MAX( zv_i_1d(ji,jl), epsi20 )
[2715]	410	END DO
	411	END DO
[825]	412
[4688]	413	!------------------------------------------------
	414	! 6.2) bottom ice growth + ice enthalpy remapping
	415	!------------------------------------------------
	416	DO jl = 1, jpl
[825]	417
[4688]	418	! for remapping
[8327]	419	h_i_old (1:nidx,0:nlay_i+1) = 0._wp
	420	eh_i_old(1:nidx,0:nlay_i+1) = 0._wp
[921]	421	DO jk = 1, nlay_i
[8327]	422	DO ji = 1, nidx
[5123]	423	h_i_old (ji,jk) = zv_i_1d(ji,jl) * r1_nlay_i
[8325]	424	eh_i_old(ji,jk) = ze_i_1d(ji,jk,jl) * h_i_old(ji,jk)
[2715]	425	END DO
	426	END DO
[4688]	427
	428	! new volumes including lateral/bottom accretion + residual
[8327]	429	DO ji = 1, nidx
[4990]	430	rswitch = MAX( 0._wp, SIGN( 1._wp , zat_i_1d(ji) - epsi20 ) )
	431	zv_newfra = rswitch * ( zdv_res(ji) + zv_frazb(ji) ) * za_i_1d(ji,jl) / MAX( zat_i_1d(ji) , epsi20 )
	432	za_i_1d(ji,jl) = rswitch * za_i_1d(ji,jl)
[4688]	433	zv_i_1d(ji,jl) = zv_i_1d(ji,jl) + zv_newfra
	434	! for remapping
	435	h_i_old (ji,nlay_i+1) = zv_newfra
[8325]	436	eh_i_old(ji,nlay_i+1) = ze_newice(ji) * zv_newfra
[4688]	437	ENDDO
	438	! --- Ice enthalpy remapping --- !
[8342]	439	CALL lim_thd_ent( ze_i_1d(1:nidx,:,jl) )
[4688]	440	ENDDO
	441
[921]	442	!-----------------
	443	! Update salinity
	444	!-----------------
[4161]	445	DO jl = 1, jpl
[8327]	446	DO ji = 1, nidx
[4872]	447	zdv = zv_i_1d(ji,jl) - zv_b(ji,jl)
[4688]	448	zsmv_i_1d(ji,jl) = zsmv_i_1d(ji,jl) + zdv * zs_newice(ji)
	449	END DO
[4161]	450	END DO
	451
[921]	452	!------------------------------------------------------------------------------!
[8327]	453	! 8) Change units for e_i
	454	!------------------------------------------------------------------------------!
	455	DO jl = 1, jpl
	456	DO jk = 1, nlay_i
	457	DO ji = 1, nidx
	458	ze_i_1d(ji,jk,jl) = ze_i_1d(ji,jk,jl) * zv_i_1d(ji,jl) * r1_nlay_i
	459	END DO
	460	END DO
	461	END DO
	462	!------------------------------------------------------------------------------!
[4688]	463	! 7) Change 2D vectors to 1D vectors
[921]	464	!------------------------------------------------------------------------------!
	465	DO jl = 1, jpl
[8342]	466	CALL tab_1d_2d( nidx, idxice(1:nidx), za_i_1d (1:nidx,jl), a_i (:,:,jl) )
	467	CALL tab_1d_2d( nidx, idxice(1:nidx), zv_i_1d (1:nidx,jl), v_i (:,:,jl) )
	468	CALL tab_1d_2d( nidx, idxice(1:nidx), zsmv_i_1d(1:nidx,jl), smv_i (:,:,jl) )
[921]	469	DO jk = 1, nlay_i
[8342]	470	CALL tab_1d_2d( nidx, idxice(1:nidx), ze_i_1d(1:nidx,jk,jl), e_i(:,:,jk,jl) )
[2715]	471	END DO
	472	END DO
[8342]	473	CALL tab_1d_2d( nidx, idxice(1:nidx), sfx_opw_1d(1:nidx), sfx_opw )
	474	CALL tab_1d_2d( nidx, idxice(1:nidx), wfx_opw_1d(1:nidx), wfx_opw )
	475	CALL tab_1d_2d( nidx, idxice(1:nidx), hfx_thd_1d(1:nidx), hfx_thd )
	476	CALL tab_1d_2d( nidx, idxice(1:nidx), hfx_opw_1d(1:nidx), hfx_opw )
[2715]	477	!
[8327]	478	ENDIF ! nidx > 0
[2715]	479	!
[8379]	480	IF( ln_limdiachk ) CALL lim_cons_hsm(1, 'limthd_lac', zvi_b, zsmv_b, zei_b, zfw_b, zfs_b, zft_b)
	481	!
[825]	482	END SUBROUTINE lim_thd_lac
	483
	484	#else
[2715]	485	!!----------------------------------------------------------------------
	486	!! Default option NO LIM3 sea-ice model
	487	!!----------------------------------------------------------------------
[825]	488	CONTAINS
	489	SUBROUTINE lim_thd_lac ! Empty routine
	490	END SUBROUTINE lim_thd_lac
	491	#endif
[2715]	492
	493	!!======================================================================
[825]	494	END MODULE limthd_lac

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