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limthd_sal.F90 in trunk/NEMOGCM/NEMO/LIM_SRC_3 – NEMO

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source: trunk/NEMOGCM/NEMO/LIM_SRC_3/limthd_sal.F90 @ 3481

Last change on this file since 3481 was 3294, checked in by rblod, 12 years ago
Merge of 3.4beta into the trunk
Property svn:keywords set to `Id`
File size: 12.4 KB

Rev	Line
[825]	1	MODULE limthd_sal
	2	!!======================================================================
	3	!! * MODULE limthd_sal *
[2528]	4	!! LIM-3 sea-ice : computation of salinity variations in the ice
[825]	5	!!======================================================================
[2528]	6	!! History : - ! 2003-05 (M. Vancoppenolle) UCL-ASTR first coding for LIM3-1D
	7	!! 3.0 ! 2005-12 (M. Vancoppenolle) adapted to the 3-D version
[2715]	8	!! 4.0 ! 2011-02 (G. Madec) dynamical allocation
[2528]	9	!!---------------------------------------------------------------------
[888]	10	#if defined key_lim3
[825]	11	!!----------------------------------------------------------------------
[2528]	12	!! 'key_lim3' LIM-3 sea-ice model
	13	!!----------------------------------------------------------------------
[825]	14	!! lim_thd_sal : salinity variations in the ice
[2528]	15	!!----------------------------------------------------------------------
[825]	16	USE par_oce ! ocean parameters
	17	USE phycst ! physical constants (ocean directory)
[888]	18	USE sbc_oce ! Surface boundary condition: ocean fields
[2715]	19	USE ice ! LIM variables
	20	USE par_ice ! LIM parameters
	21	USE thd_ice ! LIM thermodynamics
	22	USE limvar ! LIM variables
[2528]	23	USE in_out_manager ! I/O manager
[3294]	24	USE lib_mpp ! MPP library
	25	USE wrk_nemo ! work arrays
[825]	26
	27	IMPLICIT NONE
	28	PRIVATE
	29
[2528]	30	PUBLIC lim_thd_sal ! called by limthd module
	31	PUBLIC lim_thd_sal_init ! called by iceini module
[825]	32
[1156]	33	!!----------------------------------------------------------------------
[2715]	34	!! NEMO/LIM3 4.0 , UCL - NEMO Consortium (2011)
[1156]	35	!! $Id$
[2528]	36	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[1156]	37	!!----------------------------------------------------------------------
[921]	38	CONTAINS
[825]	39
[2528]	40	SUBROUTINE lim_thd_sal( kideb, kiut )
[825]	41	!!-------------------------------------------------------------------
[2528]	42	!! * ROUTINE lim_thd_sal *
	43	!!
	44	!! ** Purpose : computes new salinities in the ice
[825]	45	!!
	46	!! ** Method : 4 possibilities
	47	!! -> num_sal = 1 -> constant salinity for z,t
	48	!! -> num_sal = 2 -> S = S(z,t) [simple Vancoppenolle et al 2005]
	49	!! -> num_sal = 3 -> S = S(z) [multiyear ice]
	50	!! -> num_sal = 4 -> S = S(h) [Cox and Weeks 74]
	51	!!---------------------------------------------------------------------
[2528]	52	INTEGER, INTENT(in) :: kideb, kiut ! thickness category index
	53	!
	54	INTEGER :: ji, jk ! dummy loop indices
	55	INTEGER :: zji, zjj ! local integers
[2715]	56	REAL(wp) :: zsold, iflush, iaccrbo, igravdr, isnowic, i_ice_switch, ztmelts ! local scalars
[2528]	57	REAL(wp) :: zaaa, zbbb, zccc, zdiscrim ! local scalars
[2715]	58	REAL(wp), POINTER, DIMENSION(:) :: ze_init, zhiold, zsiold
[2528]	59	!!---------------------------------------------------------------------
[825]	60
[3294]	61	CALL wrk_alloc( jpij, ze_init, zhiold, zsiold )
[825]	62
[921]	63	!------------------------------------------------------------------------------\|
	64	! 1) Constant salinity, constant in time \|
	65	!------------------------------------------------------------------------------\|
[2715]	66	!!gm comment: if num_sal = 1 s_i_b and sm_i_b can be set to bulk_sal one for all in the initialisation phase !!
[2528]	67	IF( num_sal == 1 ) THEN
[2715]	68	!
[825]	69	DO jk = 1, nlay_i
	70	DO ji = kideb, kiut
	71	s_i_b(ji,jk) = bulk_sal
	72	END DO ! ji
	73	END DO ! jk
[2528]	74	!
[825]	75	DO ji = kideb, kiut
	76	sm_i_b(ji) = bulk_sal
	77	END DO ! ji
[2528]	78	!
	79	ENDIF
[825]	80
[921]	81	!------------------------------------------------------------------------------\|
	82	! Module 2 : Constant salinity varying in time \|
	83	!------------------------------------------------------------------------------\|
[825]	84
[2715]	85	IF( num_sal == 2 .OR. num_sal == 4 ) THEN
[825]	86
	87	!---------------------------------
	88	! Thickness at previous time step
	89	!---------------------------------
	90	DO ji = kideb, kiut
[2715]	91	zhiold(ji) = ht_i_b(ji) - dh_i_bott(ji) - dh_snowice(ji) - dh_i_surf(ji)
	92	END DO
[825]	93
	94	!---------------------
	95	! Global heat content
	96	!---------------------
[2715]	97	ze_init(:) = 0._wp
[825]	98	DO jk = 1, nlay_i
	99	DO ji = kideb, kiut
	100	ze_init(ji) = ze_init(ji) + q_i_b(ji,jk) * ht_i_b(ji) / nlay_i
[2715]	101	END DO
	102	END DO
[825]	103
	104	DO ji = kideb, kiut
[2715]	105	!
[825]	106	! Switches
	107	!----------
[2715]	108	iflush = MAX( 0._wp , SIGN( 1.0 , t_su_b(ji) - rtt ) ) ! =1 if summer
	109	igravdr = MAX( 0._wp , SIGN( 1.0 , t_bo_b(ji) - t_su_b(ji) ) ) ! =1 if t_su < t_bo
	110	iaccrbo = MAX( 0._wp , SIGN( 1.0 , dh_i_bott(ji) ) ) ! =1 if bottom accretion
	111	i_ice_switch = 1._wp - MAX ( 0._wp , SIGN( 1._wp , - ht_i_b(ji) + 1.e-2 ) )
	112	isnowic = 1._wp - MAX ( 0._wp , SIGN( 1._wp , - dh_snowice(ji) ) ) * i_ice_switch ! =1 if snow ice formation
[825]	113
	114	!---------------------
	115	! Salinity tendencies
	116	!---------------------
[2715]	117	! ! drainage by gravity drainage
[2528]	118	dsm_i_gd_1d(ji) = - igravdr * MAX( sm_i_b(ji) - sal_G , 0._wp ) / time_G * rdt_ice
[2715]	119	! ! drainage by flushing
	120	dsm_i_fl_1d(ji) = - iflush * MAX( sm_i_b(ji) - sal_F , 0._wp ) / time_F * rdt_ice
[825]	121
	122	!-----------------
	123	! Update salinity
	124	!-----------------
	125	! only drainage terms ( gravity drainage and flushing )
[2715]	126	! snow ice / bottom sources are added in lim_thd_ent to conserve energy
[825]	127	zsiold(ji) = sm_i_b(ji)
[2528]	128	sm_i_b(ji) = sm_i_b(ji) + dsm_i_fl_1d(ji) + dsm_i_gd_1d(ji)
[825]	129
[2715]	130	! if no ice, salinity = 0.1
[2528]	131	i_ice_switch = 1._wp - MAX ( 0._wp, SIGN( 1._wp , - ht_i_b(ji) ) )
[2715]	132	sm_i_b(ji) = i_ice_switch * sm_i_b(ji) + s_i_min * ( 1._wp - i_ice_switch )
[825]	133	END DO ! ji
	134
	135	! Salinity profile
[2528]	136	CALL lim_var_salprof1d( kideb, kiut )
[825]	137
	138	!----------------------------
	139	! Heat flux - brine drainage
	140	!----------------------------
	141
	142	DO ji = kideb, kiut
[2715]	143	!!gm useless
[825]	144	! iflush : 1 if summer
[2528]	145	iflush = MAX( 0._wp , SIGN ( 1._wp , t_su_b(ji) - rtt ) )
[825]	146	! igravdr : 1 if t_su lt t_bo
[2528]	147	igravdr = MAX( 0._wp , SIGN ( 1._wp , t_bo_b(ji) - t_su_b(ji) ) )
[825]	148	! iaccrbo : 1 if bottom accretion
[2528]	149	iaccrbo = MAX( 0._wp , SIGN ( 1._wp , dh_i_bott(ji) ) )
[2715]	150	!!gm end useless
[2528]	151	!
	152	fhbri_1d(ji) = 0._wp
[825]	153	END DO ! ji
	154
	155	!----------------------------
	156	! Salt flux - brine drainage
	157	!----------------------------
	158	DO ji = kideb, kiut
[2528]	159	i_ice_switch = 1._wp - MAX ( 0._wp, SIGN( 1._wp , - ht_i_b(ji) ) )
	160	fsbri_1d(ji) = fsbri_1d(ji) - i_ice_switch * rhoic * a_i_b(ji) * ht_i_b(ji) &
	161	& * ( MAX(dsm_i_gd_1d(ji) + dsm_i_fl_1d(ji), sm_i_b(ji) - zsiold(ji) ) ) / rdt_ice
	162	IF( num_sal == 4 ) fsbri_1d(ji) = 0._wp
[825]	163	END DO ! ji
	164
	165	! Only necessary for conservation check since salinity is modified
	166	!--------------------
	167	! Temperature update
	168	!--------------------
	169	DO jk = 1, nlay_i
	170	DO ji = kideb, kiut
	171	ztmelts = -tmut*s_i_b(ji,jk) + rtt
	172	!Conversion q(S,T) -> T (second order equation)
	173	zaaa = cpic
[2528]	174	zbbb = ( rcp - cpic ) * ( ztmelts - rtt ) + q_i_b(ji,jk) / rhoic - lfus
[825]	175	zccc = lfus * ( ztmelts - rtt )
[2715]	176	zdiscrim = SQRT( MAX( zbbbzbbb - 4.0zaaa*zccc, 0._wp ) )
[2528]	177	t_i_b(ji,jk) = rtt - ( zbbb + zdiscrim ) / ( 2.0 *zaaa )
[2715]	178	END DO
	179	END DO
[2528]	180	!
[825]	181	ENDIF ! num_sal .EQ. 2
	182
[921]	183	!------------------------------------------------------------------------------\|
	184	! Module 3 : Profile of salinity, constant in time \|
	185	!------------------------------------------------------------------------------\|
[825]	186
[2715]	187	IF( num_sal == 3 ) CALL lim_var_salprof1d( kideb, kiut )
[825]	188
[921]	189	!------------------------------------------------------------------------------\|
	190	! Module 4 : Constant salinity varying in time \|
	191	!------------------------------------------------------------------------------\|
[825]	192
[2715]	193	IF( num_sal == 5 ) THEN ! Cox and Weeks, 1974
	194	!
[825]	195	DO ji = kideb, kiut
	196	zsold = sm_i_b(ji)
[2715]	197	IF( ht_i_b(ji) < 0.4 ) THEN
	198	sm_i_b(ji) = 14.24 - 19.39 * ht_i_b(ji)
[825]	199	ELSE
[2715]	200	sm_i_b(ji) = 7.88 - 1.59 * ht_i_b(ji)
	201	sm_i_b(ji) = MIN( sm_i_b(ji) , zsold )
[825]	202	ENDIF
[2715]	203	IF( ht_i_b(ji) > 3.06918239 ) THEN
	204	sm_i_b(ji) = 3._wp
[825]	205	ENDIF
	206	DO jk = 1, nlay_i
	207	s_i_b(ji,jk) = sm_i_b(ji)
	208	END DO
[2715]	209	END DO
	210	!
[825]	211	ENDIF ! num_sal
	212
[921]	213	!------------------------------------------------------------------------------\|
	214	! 5) Computation of salt flux due to Bottom growth
	215	!------------------------------------------------------------------------------\|
[825]	216
[2715]	217	IF ( num_sal == 4 ) THEN
[825]	218	DO ji = kideb, kiut
[2715]	219	zji = MOD( npb(ji) - 1 , jpi ) + 1
	220	zjj = ( npb(ji) - 1 ) / jpi + 1
[2528]	221	fseqv_1d(ji) = fseqv_1d(ji) + ( sss_m(zji,zjj) - bulk_sal ) &
	222	& * rhoic * a_i_b(ji) * MAX( dh_i_bott(ji) , 0.0 ) / rdt_ice
[825]	223	END DO
	224	ELSE
	225	DO ji = kideb, kiut
[2715]	226	zji = MOD( npb(ji) - 1 , jpi ) + 1
	227	zjj = ( npb(ji) - 1 ) / jpi + 1
[2528]	228	fseqv_1d(ji) = fseqv_1d(ji) + ( sss_m(zji,zjj) - s_i_new(ji) ) &
	229	& * rhoic * a_i_b(ji) * MAX( dh_i_bott(ji) , 0.0 ) / rdt_ice
[2715]	230	END DO
[825]	231	ENDIF
[2528]	232	!
[3294]	233	CALL wrk_dealloc( jpij, ze_init, zhiold, zsiold )
[2715]	234	!
[825]	235	END SUBROUTINE lim_thd_sal
	236
[2528]	237
[825]	238	SUBROUTINE lim_thd_sal_init
	239	!!-------------------------------------------------------------------
	240	!! * ROUTINE lim_thd_sal_init *
	241	!!
	242	!! ** Purpose : initialization of ice salinity parameters
	243	!!
[2528]	244	!! ** Method : Read the namicesal namelist and check the parameter
	245	!! values called at the first timestep (nit000)
[825]	246	!!
	247	!! ** input : Namelist namicesal
	248	!!-------------------------------------------------------------------
[2528]	249	NAMELIST/namicesal/ num_sal, bulk_sal, sal_G, time_G, sal_F, time_F, &
	250	& s_i_max, s_i_min, s_i_0, s_i_1
[825]	251	!!-------------------------------------------------------------------
[2528]	252	!
	253	REWIND( numnam_ice ) ! Read Namelist namicesal
	254	READ ( numnam_ice , namicesal )
	255	!
	256	IF(lwp) THEN ! control print
[825]	257	WRITE(numout,*)
	258	WRITE(numout,*) 'lim_thd_sal_init : Ice parameters for salinity '
	259	WRITE(numout,*) '~~~~~~~~~~~~~~~~'
	260	WRITE(numout,*) ' switch for salinity num_sal : ', num_sal
	261	WRITE(numout,*) ' bulk salinity value if num_sal = 1 : ', bulk_sal
	262	WRITE(numout,*) ' restoring salinity for GD : ', sal_G
	263	WRITE(numout,*) ' restoring time for GD : ', time_G
	264	WRITE(numout,*) ' restoring salinity for flushing : ', sal_F
	265	WRITE(numout,*) ' restoring time for flushing : ', time_F
	266	WRITE(numout,*) ' Maximum tolerated ice salinity : ', s_i_max
	267	WRITE(numout,*) ' Minimum tolerated ice salinity : ', s_i_min
	268	WRITE(numout,*) ' 1st salinity for salinity profile : ', s_i_0
	269	WRITE(numout,*) ' 2nd salinity for salinity profile : ', s_i_1
	270	ENDIF
[2528]	271	!
[825]	272	END SUBROUTINE lim_thd_sal_init
	273
	274	#else
	275	!!----------------------------------------------------------------------
[2528]	276	!! Default option Dummy Module No LIM-3 sea-ice model
[825]	277	!!----------------------------------------------------------------------
	278	#endif
	279	!!======================================================================
	280	END MODULE limthd_sal

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