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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 @ 3558

Last change on this file since 3558 was 3558, checked in by rblod, 11 years ago
Fix issues when using key_nosignedzeo, see ticket #996
Property svn:keywords set to `Id`
File size: 12.5 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
[3558]	26	USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined)
[825]	27
	28	IMPLICIT NONE
	29	PRIVATE
	30
[2528]	31	PUBLIC lim_thd_sal ! called by limthd module
	32	PUBLIC lim_thd_sal_init ! called by iceini module
[825]	33
[1156]	34	!!----------------------------------------------------------------------
[2715]	35	!! NEMO/LIM3 4.0 , UCL - NEMO Consortium (2011)
[1156]	36	!! $Id$
[2528]	37	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[1156]	38	!!----------------------------------------------------------------------
[921]	39	CONTAINS
[825]	40
[2528]	41	SUBROUTINE lim_thd_sal( kideb, kiut )
[825]	42	!!-------------------------------------------------------------------
[2528]	43	!! * ROUTINE lim_thd_sal *
	44	!!
	45	!! ** Purpose : computes new salinities in the ice
[825]	46	!!
	47	!! ** Method : 4 possibilities
	48	!! -> num_sal = 1 -> constant salinity for z,t
	49	!! -> num_sal = 2 -> S = S(z,t) [simple Vancoppenolle et al 2005]
	50	!! -> num_sal = 3 -> S = S(z) [multiyear ice]
	51	!! -> num_sal = 4 -> S = S(h) [Cox and Weeks 74]
	52	!!---------------------------------------------------------------------
[2528]	53	INTEGER, INTENT(in) :: kideb, kiut ! thickness category index
	54	!
	55	INTEGER :: ji, jk ! dummy loop indices
	56	INTEGER :: zji, zjj ! local integers
[2715]	57	REAL(wp) :: zsold, iflush, iaccrbo, igravdr, isnowic, i_ice_switch, ztmelts ! local scalars
[2528]	58	REAL(wp) :: zaaa, zbbb, zccc, zdiscrim ! local scalars
[2715]	59	REAL(wp), POINTER, DIMENSION(:) :: ze_init, zhiold, zsiold
[2528]	60	!!---------------------------------------------------------------------
[825]	61
[3294]	62	CALL wrk_alloc( jpij, ze_init, zhiold, zsiold )
[825]	63
[921]	64	!------------------------------------------------------------------------------\|
	65	! 1) Constant salinity, constant in time \|
	66	!------------------------------------------------------------------------------\|
[2715]	67	!!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]	68	IF( num_sal == 1 ) THEN
[2715]	69	!
[825]	70	DO jk = 1, nlay_i
	71	DO ji = kideb, kiut
	72	s_i_b(ji,jk) = bulk_sal
	73	END DO ! ji
	74	END DO ! jk
[2528]	75	!
[825]	76	DO ji = kideb, kiut
	77	sm_i_b(ji) = bulk_sal
	78	END DO ! ji
[2528]	79	!
	80	ENDIF
[825]	81
[921]	82	!------------------------------------------------------------------------------\|
	83	! Module 2 : Constant salinity varying in time \|
	84	!------------------------------------------------------------------------------\|
[825]	85
[2715]	86	IF( num_sal == 2 .OR. num_sal == 4 ) THEN
[825]	87
	88	!---------------------------------
	89	! Thickness at previous time step
	90	!---------------------------------
	91	DO ji = kideb, kiut
[2715]	92	zhiold(ji) = ht_i_b(ji) - dh_i_bott(ji) - dh_snowice(ji) - dh_i_surf(ji)
	93	END DO
[825]	94
	95	!---------------------
	96	! Global heat content
	97	!---------------------
[2715]	98	ze_init(:) = 0._wp
[825]	99	DO jk = 1, nlay_i
	100	DO ji = kideb, kiut
	101	ze_init(ji) = ze_init(ji) + q_i_b(ji,jk) * ht_i_b(ji) / nlay_i
[2715]	102	END DO
	103	END DO
[825]	104
	105	DO ji = kideb, kiut
[2715]	106	!
[825]	107	! Switches
	108	!----------
[2715]	109	iflush = MAX( 0._wp , SIGN( 1.0 , t_su_b(ji) - rtt ) ) ! =1 if summer
	110	igravdr = MAX( 0._wp , SIGN( 1.0 , t_bo_b(ji) - t_su_b(ji) ) ) ! =1 if t_su < t_bo
	111	iaccrbo = MAX( 0._wp , SIGN( 1.0 , dh_i_bott(ji) ) ) ! =1 if bottom accretion
	112	i_ice_switch = 1._wp - MAX ( 0._wp , SIGN( 1._wp , - ht_i_b(ji) + 1.e-2 ) )
	113	isnowic = 1._wp - MAX ( 0._wp , SIGN( 1._wp , - dh_snowice(ji) ) ) * i_ice_switch ! =1 if snow ice formation
[825]	114
	115	!---------------------
	116	! Salinity tendencies
	117	!---------------------
[2715]	118	! ! drainage by gravity drainage
[2528]	119	dsm_i_gd_1d(ji) = - igravdr * MAX( sm_i_b(ji) - sal_G , 0._wp ) / time_G * rdt_ice
[2715]	120	! ! drainage by flushing
	121	dsm_i_fl_1d(ji) = - iflush * MAX( sm_i_b(ji) - sal_F , 0._wp ) / time_F * rdt_ice
[825]	122
	123	!-----------------
	124	! Update salinity
	125	!-----------------
	126	! only drainage terms ( gravity drainage and flushing )
[2715]	127	! snow ice / bottom sources are added in lim_thd_ent to conserve energy
[825]	128	zsiold(ji) = sm_i_b(ji)
[2528]	129	sm_i_b(ji) = sm_i_b(ji) + dsm_i_fl_1d(ji) + dsm_i_gd_1d(ji)
[825]	130
[2715]	131	! if no ice, salinity = 0.1
[2528]	132	i_ice_switch = 1._wp - MAX ( 0._wp, SIGN( 1._wp , - ht_i_b(ji) ) )
[2715]	133	sm_i_b(ji) = i_ice_switch * sm_i_b(ji) + s_i_min * ( 1._wp - i_ice_switch )
[825]	134	END DO ! ji
	135
	136	! Salinity profile
[2528]	137	CALL lim_var_salprof1d( kideb, kiut )
[825]	138
	139	!----------------------------
	140	! Heat flux - brine drainage
	141	!----------------------------
	142
	143	DO ji = kideb, kiut
[2715]	144	!!gm useless
[825]	145	! iflush : 1 if summer
[2528]	146	iflush = MAX( 0._wp , SIGN ( 1._wp , t_su_b(ji) - rtt ) )
[825]	147	! igravdr : 1 if t_su lt t_bo
[2528]	148	igravdr = MAX( 0._wp , SIGN ( 1._wp , t_bo_b(ji) - t_su_b(ji) ) )
[825]	149	! iaccrbo : 1 if bottom accretion
[2528]	150	iaccrbo = MAX( 0._wp , SIGN ( 1._wp , dh_i_bott(ji) ) )
[2715]	151	!!gm end useless
[2528]	152	!
	153	fhbri_1d(ji) = 0._wp
[825]	154	END DO ! ji
	155
	156	!----------------------------
	157	! Salt flux - brine drainage
	158	!----------------------------
	159	DO ji = kideb, kiut
[2528]	160	i_ice_switch = 1._wp - MAX ( 0._wp, SIGN( 1._wp , - ht_i_b(ji) ) )
	161	fsbri_1d(ji) = fsbri_1d(ji) - i_ice_switch * rhoic * a_i_b(ji) * ht_i_b(ji) &
	162	& * ( MAX(dsm_i_gd_1d(ji) + dsm_i_fl_1d(ji), sm_i_b(ji) - zsiold(ji) ) ) / rdt_ice
	163	IF( num_sal == 4 ) fsbri_1d(ji) = 0._wp
[825]	164	END DO ! ji
	165
	166	! Only necessary for conservation check since salinity is modified
	167	!--------------------
	168	! Temperature update
	169	!--------------------
	170	DO jk = 1, nlay_i
	171	DO ji = kideb, kiut
	172	ztmelts = -tmut*s_i_b(ji,jk) + rtt
	173	!Conversion q(S,T) -> T (second order equation)
	174	zaaa = cpic
[2528]	175	zbbb = ( rcp - cpic ) * ( ztmelts - rtt ) + q_i_b(ji,jk) / rhoic - lfus
[825]	176	zccc = lfus * ( ztmelts - rtt )
[2715]	177	zdiscrim = SQRT( MAX( zbbbzbbb - 4.0zaaa*zccc, 0._wp ) )
[2528]	178	t_i_b(ji,jk) = rtt - ( zbbb + zdiscrim ) / ( 2.0 *zaaa )
[2715]	179	END DO
	180	END DO
[2528]	181	!
[825]	182	ENDIF ! num_sal .EQ. 2
	183
[921]	184	!------------------------------------------------------------------------------\|
	185	! Module 3 : Profile of salinity, constant in time \|
	186	!------------------------------------------------------------------------------\|
[825]	187
[2715]	188	IF( num_sal == 3 ) CALL lim_var_salprof1d( kideb, kiut )
[825]	189
[921]	190	!------------------------------------------------------------------------------\|
	191	! Module 4 : Constant salinity varying in time \|
	192	!------------------------------------------------------------------------------\|
[825]	193
[2715]	194	IF( num_sal == 5 ) THEN ! Cox and Weeks, 1974
	195	!
[825]	196	DO ji = kideb, kiut
	197	zsold = sm_i_b(ji)
[2715]	198	IF( ht_i_b(ji) < 0.4 ) THEN
	199	sm_i_b(ji) = 14.24 - 19.39 * ht_i_b(ji)
[825]	200	ELSE
[2715]	201	sm_i_b(ji) = 7.88 - 1.59 * ht_i_b(ji)
	202	sm_i_b(ji) = MIN( sm_i_b(ji) , zsold )
[825]	203	ENDIF
[2715]	204	IF( ht_i_b(ji) > 3.06918239 ) THEN
	205	sm_i_b(ji) = 3._wp
[825]	206	ENDIF
	207	DO jk = 1, nlay_i
	208	s_i_b(ji,jk) = sm_i_b(ji)
	209	END DO
[2715]	210	END DO
	211	!
[825]	212	ENDIF ! num_sal
	213
[921]	214	!------------------------------------------------------------------------------\|
	215	! 5) Computation of salt flux due to Bottom growth
	216	!------------------------------------------------------------------------------\|
[825]	217
[2715]	218	IF ( num_sal == 4 ) THEN
[825]	219	DO ji = kideb, kiut
[2715]	220	zji = MOD( npb(ji) - 1 , jpi ) + 1
	221	zjj = ( npb(ji) - 1 ) / jpi + 1
[2528]	222	fseqv_1d(ji) = fseqv_1d(ji) + ( sss_m(zji,zjj) - bulk_sal ) &
	223	& * rhoic * a_i_b(ji) * MAX( dh_i_bott(ji) , 0.0 ) / rdt_ice
[825]	224	END DO
	225	ELSE
	226	DO ji = kideb, kiut
[2715]	227	zji = MOD( npb(ji) - 1 , jpi ) + 1
	228	zjj = ( npb(ji) - 1 ) / jpi + 1
[2528]	229	fseqv_1d(ji) = fseqv_1d(ji) + ( sss_m(zji,zjj) - s_i_new(ji) ) &
	230	& * rhoic * a_i_b(ji) * MAX( dh_i_bott(ji) , 0.0 ) / rdt_ice
[2715]	231	END DO
[825]	232	ENDIF
[2528]	233	!
[3294]	234	CALL wrk_dealloc( jpij, ze_init, zhiold, zsiold )
[2715]	235	!
[825]	236	END SUBROUTINE lim_thd_sal
	237
[2528]	238
[825]	239	SUBROUTINE lim_thd_sal_init
	240	!!-------------------------------------------------------------------
	241	!! * ROUTINE lim_thd_sal_init *
	242	!!
	243	!! ** Purpose : initialization of ice salinity parameters
	244	!!
[2528]	245	!! ** Method : Read the namicesal namelist and check the parameter
	246	!! values called at the first timestep (nit000)
[825]	247	!!
	248	!! ** input : Namelist namicesal
	249	!!-------------------------------------------------------------------
[2528]	250	NAMELIST/namicesal/ num_sal, bulk_sal, sal_G, time_G, sal_F, time_F, &
	251	& s_i_max, s_i_min, s_i_0, s_i_1
[825]	252	!!-------------------------------------------------------------------
[2528]	253	!
	254	REWIND( numnam_ice ) ! Read Namelist namicesal
	255	READ ( numnam_ice , namicesal )
	256	!
	257	IF(lwp) THEN ! control print
[825]	258	WRITE(numout,*)
	259	WRITE(numout,*) 'lim_thd_sal_init : Ice parameters for salinity '
	260	WRITE(numout,*) '~~~~~~~~~~~~~~~~'
	261	WRITE(numout,*) ' switch for salinity num_sal : ', num_sal
	262	WRITE(numout,*) ' bulk salinity value if num_sal = 1 : ', bulk_sal
	263	WRITE(numout,*) ' restoring salinity for GD : ', sal_G
	264	WRITE(numout,*) ' restoring time for GD : ', time_G
	265	WRITE(numout,*) ' restoring salinity for flushing : ', sal_F
	266	WRITE(numout,*) ' restoring time for flushing : ', time_F
	267	WRITE(numout,*) ' Maximum tolerated ice salinity : ', s_i_max
	268	WRITE(numout,*) ' Minimum tolerated ice salinity : ', s_i_min
	269	WRITE(numout,*) ' 1st salinity for salinity profile : ', s_i_0
	270	WRITE(numout,*) ' 2nd salinity for salinity profile : ', s_i_1
	271	ENDIF
[2528]	272	!
[825]	273	END SUBROUTINE lim_thd_sal_init
	274
	275	#else
	276	!!----------------------------------------------------------------------
[2528]	277	!! Default option Dummy Module No LIM-3 sea-ice model
[825]	278	!!----------------------------------------------------------------------
	279	#endif
	280	!!======================================================================
	281	END MODULE limthd_sal

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