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asminc.F90 in trunk/NEMOGCM/NEMO/OPA_SRC/ASM – NEMO

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source: trunk/NEMOGCM/NEMO/OPA_SRC/ASM/asminc.F90 @ 8547

Last change on this file since 8547 was 8547, checked in by timgraham, 7 years ago
Correct typo in last commit for #1849
Property svn:keywords set to `Id`
File size: 45.2 KB

Rev	Line
[2128]	1	MODULE asminc
	2	!!======================================================================
	3	!! * MODULE asminc *
	4	!! Assimilation increment : Apply an increment generated by data
	5	!! assimilation
	6	!!======================================================================
[2392]	7	!! History : ! 2007-03 (M. Martin) Met Office version
	8	!! ! 2007-04 (A. Weaver) calc_date original code
	9	!! ! 2007-04 (A. Weaver) Merge with OPAVAR/NEMOVAR
	10	!! NEMO 3.3 ! 2010-05 (D. Lea) Update to work with NEMO v3.2
	11	!! - ! 2010-05 (D. Lea) add calc_month_len routine based on day_init
[3764]	12	!! 3.4 ! 2012-10 (A. Weaver and K. Mogensen) Fix for direct initialization
[6140]	13	!! ! 2014-09 (D. Lea) Local calc_date removed use routine from OBS
	14	!! ! 2015-11 (D. Lea) Handle non-zero initial time of day
[2392]	15	!!----------------------------------------------------------------------
[2128]	16
	17	!!----------------------------------------------------------------------
[3785]	18	!! asm_inc_init : Initialize the increment arrays and IAU weights
	19	!! tra_asm_inc : Apply the tracer (T and S) increments
	20	!! dyn_asm_inc : Apply the dynamic (u and v) increments
	21	!! ssh_asm_inc : Apply the SSH increment
	22	!! seaice_asm_inc : Apply the seaice increment
[2128]	23	!!----------------------------------------------------------------------
[3294]	24	USE wrk_nemo ! Memory Allocation
[2392]	25	USE par_oce ! Ocean space and time domain variables
	26	USE dom_oce ! Ocean space and time domain
[3785]	27	USE domvvl ! domain: variable volume level
[2392]	28	USE oce ! Dynamics and active tracers defined in memory
[5836]	29	USE ldfdyn ! lateral diffusion: eddy viscosity coefficients
[2392]	30	USE eosbn2 ! Equation of state - in situ and potential density
	31	USE zpshde ! Partial step : Horizontal Derivative
	32	USE iom ! Library to read input files
	33	USE asmpar ! Parameters for the assmilation interface
[2435]	34	USE c1d ! 1D initialization
[2715]	35	USE in_out_manager ! I/O manager
[3764]	36	USE lib_mpp ! MPP library
	37	#if defined key_lim2
	38	USE ice_2 ! LIM2
	39	#endif
	40	USE sbc_oce ! Surface boundary condition variables.
[6140]	41	USE diaobs, ONLY: calc_date ! Compute the calendar date on a given step
[2128]	42
	43	IMPLICIT NONE
	44	PRIVATE
[2392]	45
	46	PUBLIC asm_inc_init !: Initialize the increment arrays and IAU weights
	47	PUBLIC tra_asm_inc !: Apply the tracer (T and S) increments
	48	PUBLIC dyn_asm_inc !: Apply the dynamic (u and v) increments
	49	PUBLIC ssh_asm_inc !: Apply the SSH increment
[3764]	50	PUBLIC seaice_asm_inc !: Apply the seaice increment
[2128]	51
	52	#if defined key_asminc
[2392]	53	LOGICAL, PUBLIC, PARAMETER :: lk_asminc = .TRUE. !: Logical switch for assimilation increment interface
[2128]	54	#else
[2392]	55	LOGICAL, PUBLIC, PARAMETER :: lk_asminc = .FALSE. !: No assimilation increments
[2128]	56	#endif
[5836]	57	LOGICAL, PUBLIC :: ln_bkgwri !: No output of the background state fields
	58	LOGICAL, PUBLIC :: ln_asmiau !: No applying forcing with an assimilation increment
	59	LOGICAL, PUBLIC :: ln_asmdin !: No direct initialization
	60	LOGICAL, PUBLIC :: ln_trainc !: No tracer (T and S) assimilation increments
	61	LOGICAL, PUBLIC :: ln_dyninc !: No dynamics (u and v) assimilation increments
	62	LOGICAL, PUBLIC :: ln_sshinc !: No sea surface height assimilation increment
	63	LOGICAL, PUBLIC :: ln_seaiceinc !: No sea ice concentration increment
	64	LOGICAL, PUBLIC :: ln_salfix !: Apply minimum salinity check
[3764]	65	LOGICAL, PUBLIC :: ln_temnofreeze = .FALSE. !: Don't allow the temperature to drop below freezing
[5836]	66	INTEGER, PUBLIC :: nn_divdmp !: Apply divergence damping filter nn_divdmp times
[2128]	67
[2392]	68	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: t_bkg , s_bkg !: Background temperature and salinity
	69	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: u_bkg , v_bkg !: Background u- & v- velocity components
	70	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: t_bkginc, s_bkginc !: Increment to the background T & S
	71	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: u_bkginc, v_bkginc !: Increment to the u- & v-components
	72	REAL(wp), PUBLIC, DIMENSION(:) , ALLOCATABLE :: wgtiau !: IAU weights for each time step
[2128]	73	#if defined key_asminc
[2392]	74	REAL(wp), PUBLIC, DIMENSION(:,:), ALLOCATABLE :: ssh_iau !: IAU-weighted sea surface height increment
[2128]	75	#endif
[2392]	76	! !!! time steps relative to the cycle interval [0,nitend-nit000-1]
	77	INTEGER , PUBLIC :: nitbkg !: Time step of the background state used in the Jb term
	78	INTEGER , PUBLIC :: nitdin !: Time step of the background state for direct initialization
	79	INTEGER , PUBLIC :: nitiaustr !: Time step of the start of the IAU interval
	80	INTEGER , PUBLIC :: nitiaufin !: Time step of the end of the IAU interval
	81	!
	82	INTEGER , PUBLIC :: niaufn !: Type of IAU weighing function: = 0 Constant weighting
	83	! !: = 1 Linear hat-like, centred in middle of IAU interval
	84	REAL(wp), PUBLIC :: salfixmin !: Ensure that the salinity is larger than this value if (ln_salfix)
[2128]	85
[2392]	86	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ssh_bkg, ssh_bkginc ! Background sea surface height and its increment
[3764]	87	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: seaice_bkginc ! Increment to the background sea ice conc
[8030]	88	#if defined key_cice && defined key_asminc
	89	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ndaice_da ! ice increment tendency into CICE
	90	#endif
[2128]	91
[3294]	92	!! * Substitutions
	93	# include "vectopt_loop_substitute.h90"
[2287]	94	!!----------------------------------------------------------------------
[6140]	95	!! NEMO/OPA 3.7 , NEMO Consortium (2015)
[2287]	96	!! $Id$
[2392]	97	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[2287]	98	!!----------------------------------------------------------------------
[2128]	99	CONTAINS
	100
	101	SUBROUTINE asm_inc_init
	102	!!----------------------------------------------------------------------
	103	!! * ROUTINE asm_inc_init *
	104	!!
	105	!! ** Purpose : Initialize the assimilation increment and IAU weights.
	106	!!
	107	!! ** Method : Initialize the assimilation increment and IAU weights.
	108	!!
	109	!! ** Action :
	110	!!----------------------------------------------------------------------
[4990]	111	INTEGER :: ji, jj, jk, jt ! dummy loop indices
	112	INTEGER :: imid, inum ! local integers
	113	INTEGER :: ios ! Local integer output status for namelist read
[2128]	114	INTEGER :: iiauper ! Number of time steps in the IAU period
	115	INTEGER :: icycper ! Number of time steps in the cycle
[6140]	116	REAL(KIND=dp) :: ditend_date ! Date YYYYMMDD.HHMMSS of final time step
	117	REAL(KIND=dp) :: ditbkg_date ! Date YYYYMMDD.HHMMSS of background time step for Jb term
	118	REAL(KIND=dp) :: ditdin_date ! Date YYYYMMDD.HHMMSS of background time step for DI
	119	REAL(KIND=dp) :: ditiaustr_date ! Date YYYYMMDD.HHMMSS of IAU interval start time step
	120	REAL(KIND=dp) :: ditiaufin_date ! Date YYYYMMDD.HHMMSS of IAU interval final time step
	121
[2128]	122	REAL(wp) :: znorm ! Normalization factor for IAU weights
[4990]	123	REAL(wp) :: ztotwgt ! Value of time-integrated IAU weights (should be equal to one)
[2128]	124	REAL(wp) :: z_inc_dateb ! Start date of interval on which increment is valid
	125	REAL(wp) :: z_inc_datef ! End date of interval on which increment is valid
	126	REAL(wp) :: zdate_bkg ! Date in background state file for DI
	127	REAL(wp) :: zdate_inc ! Time axis in increments file
[4990]	128	!
	129	REAL(wp), POINTER, DIMENSION(:,:) :: hdiv ! 2D workspace
[2392]	130	!!
[3764]	131	NAMELIST/nam_asminc/ ln_bkgwri, &
[2392]	132	& ln_trainc, ln_dyninc, ln_sshinc, &
	133	& ln_asmdin, ln_asmiau, &
	134	& nitbkg, nitdin, nitiaustr, nitiaufin, niaufn, &
[4990]	135	& ln_salfix, salfixmin, nn_divdmp
[2392]	136	!!----------------------------------------------------------------------
[2128]	137
	138	!-----------------------------------------------------------------------
	139	! Read Namelist nam_asminc : assimilation increment interface
	140	!-----------------------------------------------------------------------
[5836]	141	ln_seaiceinc = .FALSE.
[3764]	142	ln_temnofreeze = .FALSE.
[2128]	143
[4147]	144	REWIND( numnam_ref ) ! Namelist nam_asminc in reference namelist : Assimilation increment
	145	READ ( numnam_ref, nam_asminc, IOSTAT = ios, ERR = 901)
	146	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nam_asminc in reference namelist', lwp )
[2128]	147
[4147]	148	REWIND( numnam_cfg ) ! Namelist nam_asminc in configuration namelist : Assimilation increment
	149	READ ( numnam_cfg, nam_asminc, IOSTAT = ios, ERR = 902 )
	150	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nam_asminc in configuration namelist', lwp )
[4624]	151	IF(lwm) WRITE ( numond, nam_asminc )
[4147]	152
[2128]	153	! Control print
	154	IF(lwp) THEN
	155	WRITE(numout,*)
	156	WRITE(numout,*) 'asm_inc_init : Assimilation increment initialization :'
	157	WRITE(numout,*) '~~~~~~~~~~~~'
[2392]	158	WRITE(numout,*) ' Namelist namasm : set assimilation increment parameters'
	159	WRITE(numout,*) ' Logical switch for writing out background state ln_bkgwri = ', ln_bkgwri
	160	WRITE(numout,*) ' Logical switch for applying tracer increments ln_trainc = ', ln_trainc
	161	WRITE(numout,*) ' Logical switch for applying velocity increments ln_dyninc = ', ln_dyninc
	162	WRITE(numout,*) ' Logical switch for applying SSH increments ln_sshinc = ', ln_sshinc
	163	WRITE(numout,*) ' Logical switch for Direct Initialization (DI) ln_asmdin = ', ln_asmdin
[3764]	164	WRITE(numout,*) ' Logical switch for applying sea ice increments ln_seaiceinc = ', ln_seaiceinc
[2392]	165	WRITE(numout,*) ' Logical switch for Incremental Analysis Updating (IAU) ln_asmiau = ', ln_asmiau
	166	WRITE(numout,*) ' Timestep of background in [0,nitend-nit000-1] nitbkg = ', nitbkg
	167	WRITE(numout,*) ' Timestep of background for DI in [0,nitend-nit000-1] nitdin = ', nitdin
	168	WRITE(numout,*) ' Timestep of start of IAU interval in [0,nitend-nit000-1] nitiaustr = ', nitiaustr
	169	WRITE(numout,*) ' Timestep of end of IAU interval in [0,nitend-nit000-1] nitiaufin = ', nitiaufin
	170	WRITE(numout,*) ' Type of IAU weighting function niaufn = ', niaufn
	171	WRITE(numout,*) ' Logical switch for ensuring that the sa > salfixmin ln_salfix = ', ln_salfix
	172	WRITE(numout,*) ' Minimum salinity after applying the increments salfixmin = ', salfixmin
[2128]	173	ENDIF
	174
	175	nitbkg_r = nitbkg + nit000 - 1 ! Background time referenced to nit000
	176	nitdin_r = nitdin + nit000 - 1 ! Background time for DI referenced to nit000
	177	nitiaustr_r = nitiaustr + nit000 - 1 ! Start of IAU interval referenced to nit000
	178	nitiaufin_r = nitiaufin + nit000 - 1 ! End of IAU interval referenced to nit000
	179
	180	iiauper = nitiaufin_r - nitiaustr_r + 1 ! IAU interval length
	181	icycper = nitend - nit000 + 1 ! Cycle interval length
	182
[6140]	183	! Date of final time step
	184	CALL calc_date( nitend, ditend_date )
	185
	186	! Background time for Jb referenced to ndate0
	187	CALL calc_date( nitbkg_r, ditbkg_date )
	188
	189	! Background time for DI referenced to ndate0
	190	CALL calc_date( nitdin_r, ditdin_date )
	191
	192	! IAU start time referenced to ndate0
	193	CALL calc_date( nitiaustr_r, ditiaustr_date )
	194
	195	! IAU end time referenced to ndate0
	196	CALL calc_date( nitiaufin_r, ditiaufin_date )
	197
[2128]	198	IF(lwp) THEN
	199	WRITE(numout,*)
	200	WRITE(numout,*) ' Time steps referenced to current cycle:'
	201	WRITE(numout,*) ' iitrst = ', nit000 - 1
	202	WRITE(numout,*) ' nit000 = ', nit000
	203	WRITE(numout,*) ' nitend = ', nitend
	204	WRITE(numout,*) ' nitbkg_r = ', nitbkg_r
	205	WRITE(numout,*) ' nitdin_r = ', nitdin_r
	206	WRITE(numout,*) ' nitiaustr_r = ', nitiaustr_r
	207	WRITE(numout,*) ' nitiaufin_r = ', nitiaufin_r
	208	WRITE(numout,*)
	209	WRITE(numout,*) ' Dates referenced to current cycle:'
	210	WRITE(numout,*) ' ndastp = ', ndastp
	211	WRITE(numout,*) ' ndate0 = ', ndate0
[6140]	212	WRITE(numout,*) ' nn_time0 = ', nn_time0
	213	WRITE(numout,*) ' ditend_date = ', ditend_date
	214	WRITE(numout,*) ' ditbkg_date = ', ditbkg_date
	215	WRITE(numout,*) ' ditdin_date = ', ditdin_date
	216	WRITE(numout,*) ' ditiaustr_date = ', ditiaustr_date
	217	WRITE(numout,*) ' ditiaufin_date = ', ditiaufin_date
[2128]	218	ENDIF
	219
	220
	221	IF ( ( ln_asmdin ).AND.( ln_asmiau ) ) &
	222	& CALL ctl_stop( ' ln_asmdin and ln_asmiau :', &
	223	& ' Choose Direct Initialization OR Incremental Analysis Updating')
	224
	225	IF ( ( ( .NOT. ln_asmdin ).AND.( .NOT. ln_asmiau ) ) &
[3764]	226	.AND.( ( ln_trainc ).OR.( ln_dyninc ).OR.( ln_sshinc ) .OR. ( ln_seaiceinc) )) &
	227	& CALL ctl_stop( ' One or more of ln_trainc, ln_dyninc, ln_sshinc and ln_seaiceinc is set to .true.', &
[2128]	228	& ' but ln_asmdin and ln_asmiau are both set to .false. :', &
	229	& ' Inconsistent options')
	230
	231	IF ( ( niaufn /= 0 ).AND.( niaufn /= 1 ) ) &
	232	& CALL ctl_stop( ' niaufn /= 0 or niaufn /=1 :', &
	233	& ' Type IAU weighting function is invalid')
	234
[3764]	235	IF ( ( .NOT. ln_trainc ).AND.( .NOT. ln_dyninc ).AND.( .NOT. ln_sshinc ).AND.( .NOT. ln_seaiceinc ) &
[2128]	236	& ) &
[3764]	237	& CALL ctl_warn( ' ln_trainc, ln_dyninc, ln_sshinc and ln_seaiceinc are set to .false. :', &
[2128]	238	& ' The assimilation increments are not applied')
	239
	240	IF ( ( ln_asmiau ).AND.( nitiaustr == nitiaufin ) ) &
	241	& CALL ctl_stop( ' nitiaustr = nitiaufin :', &
	242	& ' IAU interval is of zero length')
	243
	244	IF ( ( ln_asmiau ).AND.( ( nitiaustr_r < nit000 ).OR.( nitiaufin_r > nitend ) ) ) &
	245	& CALL ctl_stop( ' nitiaustr or nitiaufin :', &
	246	& ' IAU starting or final time step is outside the cycle interval', &
	247	& ' Valid range nit000 to nitend')
	248
	249	IF ( ( nitbkg_r < nit000 - 1 ).OR.( nitbkg_r > nitend ) ) &
	250	& CALL ctl_stop( ' nitbkg :', &
	251	& ' Background time step is outside the cycle interval')
	252
	253	IF ( ( nitdin_r < nit000 - 1 ).OR.( nitdin_r > nitend ) ) &
	254	& CALL ctl_stop( ' nitdin :', &
	255	& ' Background time step for Direct Initialization is outside', &
	256	& ' the cycle interval')
	257
	258	IF ( nstop > 0 ) RETURN ! if there are any errors then go no further
	259
	260	!--------------------------------------------------------------------
	261	! Initialize the Incremental Analysis Updating weighting function
	262	!--------------------------------------------------------------------
	263
	264	IF ( ln_asmiau ) THEN
	265
	266	ALLOCATE( wgtiau( icycper ) )
	267
	268	wgtiau(:) = 0.0
	269
	270	IF ( niaufn == 0 ) THEN
	271
	272	!---------------------------------------------------------
	273	! Constant IAU forcing
	274	!---------------------------------------------------------
	275
	276	DO jt = 1, iiauper
	277	wgtiau(jt+nitiaustr-1) = 1.0 / REAL( iiauper )
	278	END DO
	279
	280	ELSEIF ( niaufn == 1 ) THEN
	281
	282	!---------------------------------------------------------
	283	! Linear hat-like, centred in middle of IAU interval
	284	!---------------------------------------------------------
	285
	286	! Compute the normalization factor
	287	znorm = 0.0
	288	IF ( MOD( iiauper, 2 ) == 0 ) THEN ! Even number of time steps in IAU interval
	289	imid = iiauper / 2
	290	DO jt = 1, imid
	291	znorm = znorm + REAL( jt )
	292	END DO
	293	znorm = 2.0 * znorm
	294	ELSE ! Odd number of time steps in IAU interval
	295	imid = ( iiauper + 1 ) / 2
	296	DO jt = 1, imid - 1
	297	znorm = znorm + REAL( jt )
	298	END DO
	299	znorm = 2.0 * znorm + REAL( imid )
	300	ENDIF
	301	znorm = 1.0 / znorm
	302
	303	DO jt = 1, imid - 1
	304	wgtiau(jt+nitiaustr-1) = REAL( jt ) * znorm
	305	END DO
	306	DO jt = imid, iiauper
	307	wgtiau(jt+nitiaustr-1) = REAL( iiauper - jt + 1 ) * znorm
	308	END DO
	309
	310	ENDIF
	311
	312	! Test that the integral of the weights over the weighting interval equals 1
	313	IF(lwp) THEN
	314	WRITE(numout,*)
	315	WRITE(numout,*) 'asm_inc_init : IAU weights'
	316	WRITE(numout,*) '~~~~~~~~~~~~'
	317	WRITE(numout,*) ' time step IAU weight'
	318	WRITE(numout,*) ' ========= ====================='
	319	ztotwgt = 0.0
	320	DO jt = 1, icycper
	321	ztotwgt = ztotwgt + wgtiau(jt)
	322	WRITE(numout,*) ' ', jt, ' ', wgtiau(jt)
	323	END DO
	324	WRITE(numout,*) ' ==================================='
	325	WRITE(numout,*) ' Time-integrated weight = ', ztotwgt
	326	WRITE(numout,*) ' ==================================='
	327	ENDIF
	328
	329	ENDIF
	330
	331	!--------------------------------------------------------------------
	332	! Allocate and initialize the increment arrays
	333	!--------------------------------------------------------------------
	334
	335	ALLOCATE( t_bkginc(jpi,jpj,jpk) )
	336	ALLOCATE( s_bkginc(jpi,jpj,jpk) )
	337	ALLOCATE( u_bkginc(jpi,jpj,jpk) )
	338	ALLOCATE( v_bkginc(jpi,jpj,jpk) )
	339	ALLOCATE( ssh_bkginc(jpi,jpj) )
[3764]	340	ALLOCATE( seaice_bkginc(jpi,jpj))
[2128]	341	#if defined key_asminc
	342	ALLOCATE( ssh_iau(jpi,jpj) )
	343	#endif
[8030]	344	#if defined key_cice && defined key_asminc
	345	ALLOCATE( ndaice_da(jpi,jpj) )
	346	#endif
[2128]	347	t_bkginc(:,:,:) = 0.0
	348	s_bkginc(:,:,:) = 0.0
	349	u_bkginc(:,:,:) = 0.0
	350	v_bkginc(:,:,:) = 0.0
	351	ssh_bkginc(:,:) = 0.0
[3764]	352	seaice_bkginc(:,:) = 0.0
[2128]	353	#if defined key_asminc
	354	ssh_iau(:,:) = 0.0
	355	#endif
[8030]	356	#if defined key_cice && defined key_asminc
	357	ndaice_da(:,:) = 0.0
	358	#endif
[3764]	359	IF ( ( ln_trainc ).OR.( ln_dyninc ).OR.( ln_sshinc ).OR.( ln_seaiceinc ) ) THEN
[2128]	360
	361	!--------------------------------------------------------------------
	362	! Read the increments from file
	363	!--------------------------------------------------------------------
	364
	365	CALL iom_open( c_asminc, inum )
	366
	367	CALL iom_get( inum, 'time', zdate_inc )
	368
	369	CALL iom_get( inum, 'z_inc_dateb', z_inc_dateb )
	370	CALL iom_get( inum, 'z_inc_datef', z_inc_datef )
	371	z_inc_dateb = zdate_inc
	372	z_inc_datef = zdate_inc
	373
	374	IF(lwp) THEN
	375	WRITE(numout,*)
	376	WRITE(numout,*) 'asm_inc_init : Assimilation increments valid ', &
[6140]	377	& ' between dates ', z_inc_dateb,' and ', &
	378	& z_inc_datef
[2128]	379	WRITE(numout,*) '~~~~~~~~~~~~'
	380	ENDIF
	381
[6140]	382	IF ( ( z_inc_dateb < ndastp + nn_time0*0.0001_wp ) &
	383	& .OR.( z_inc_datef > ditend_date ) ) &
[2128]	384	& CALL ctl_warn( ' Validity time of assimilation increments is ', &
	385	& ' outside the assimilation interval' )
	386
[6140]	387	IF ( ( ln_asmdin ).AND.( zdate_inc /= ditdin_date ) ) &
[2128]	388	& CALL ctl_warn( ' Validity time of assimilation increments does ', &
	389	& ' not agree with Direct Initialization time' )
	390
	391	IF ( ln_trainc ) THEN
	392	CALL iom_get( inum, jpdom_autoglo, 'bckint', t_bkginc, 1 )
	393	CALL iom_get( inum, jpdom_autoglo, 'bckins', s_bkginc, 1 )
	394	! Apply the masks
	395	t_bkginc(:,:,:) = t_bkginc(:,:,:) * tmask(:,:,:)
	396	s_bkginc(:,:,:) = s_bkginc(:,:,:) * tmask(:,:,:)
	397	! Set missing increments to 0.0 rather than 1e+20
	398	! to allow for differences in masks
	399	WHERE( ABS( t_bkginc(:,:,:) ) > 1.0e+10 ) t_bkginc(:,:,:) = 0.0
	400	WHERE( ABS( s_bkginc(:,:,:) ) > 1.0e+10 ) s_bkginc(:,:,:) = 0.0
	401	ENDIF
	402
	403	IF ( ln_dyninc ) THEN
	404	CALL iom_get( inum, jpdom_autoglo, 'bckinu', u_bkginc, 1 )
	405	CALL iom_get( inum, jpdom_autoglo, 'bckinv', v_bkginc, 1 )
	406	! Apply the masks
	407	u_bkginc(:,:,:) = u_bkginc(:,:,:) * umask(:,:,:)
	408	v_bkginc(:,:,:) = v_bkginc(:,:,:) * vmask(:,:,:)
	409	! Set missing increments to 0.0 rather than 1e+20
	410	! to allow for differences in masks
	411	WHERE( ABS( u_bkginc(:,:,:) ) > 1.0e+10 ) u_bkginc(:,:,:) = 0.0
	412	WHERE( ABS( v_bkginc(:,:,:) ) > 1.0e+10 ) v_bkginc(:,:,:) = 0.0
	413	ENDIF
	414
	415	IF ( ln_sshinc ) THEN
	416	CALL iom_get( inum, jpdom_autoglo, 'bckineta', ssh_bkginc, 1 )
	417	! Apply the masks
	418	ssh_bkginc(:,:) = ssh_bkginc(:,:) * tmask(:,:,1)
	419	! Set missing increments to 0.0 rather than 1e+20
	420	! to allow for differences in masks
	421	WHERE( ABS( ssh_bkginc(:,:) ) > 1.0e+10 ) ssh_bkginc(:,:) = 0.0
	422	ENDIF
	423
[3764]	424	IF ( ln_seaiceinc ) THEN
	425	CALL iom_get( inum, jpdom_autoglo, 'bckinseaice', seaice_bkginc, 1 )
	426	! Apply the masks
	427	seaice_bkginc(:,:) = seaice_bkginc(:,:) * tmask(:,:,1)
	428	! Set missing increments to 0.0 rather than 1e+20
	429	! to allow for differences in masks
	430	WHERE( ABS( seaice_bkginc(:,:) ) > 1.0e+10 ) seaice_bkginc(:,:) = 0.0
	431	ENDIF
	432
[2128]	433	CALL iom_close( inum )
	434
	435	ENDIF
	436
	437	!-----------------------------------------------------------------------
[3294]	438	! Apply divergence damping filter
	439	!-----------------------------------------------------------------------
	440
	441	IF ( ln_dyninc .AND. nn_divdmp > 0 ) THEN
[5836]	442	!
	443	CALL wrk_alloc( jpi,jpj, hdiv )
	444	!
	445	DO jt = 1, nn_divdmp
	446	!
[6140]	447	DO jk = 1, jpkm1 ! hdiv = e1e1 * div
[3764]	448	hdiv(:,:) = 0._wp
	449	DO jj = 2, jpjm1
	450	DO ji = fs_2, fs_jpim1 ! vector opt.
[6140]	451	hdiv(ji,jj) = ( e2u(ji ,jj) * e3u_n(ji ,jj,jk) * u_bkginc(ji ,jj,jk) &
	452	& - e2u(ji-1,jj) * e3u_n(ji-1,jj,jk) * u_bkginc(ji-1,jj,jk) &
	453	& + e1v(ji,jj ) * e3v_n(ji,jj ,jk) * v_bkginc(ji,jj ,jk) &
	454	& - e1v(ji,jj-1) * e3v_n(ji,jj-1,jk) * v_bkginc(ji,jj-1,jk) ) / e3t_n(ji,jj,jk)
[3764]	455	END DO
[3294]	456	END DO
[3764]	457	CALL lbc_lnk( hdiv, 'T', 1. ) ! lateral boundary cond. (no sign change)
[5836]	458	!
[3764]	459	DO jj = 2, jpjm1
	460	DO ji = fs_2, fs_jpim1 ! vector opt.
[6140]	461	u_bkginc(ji,jj,jk) = u_bkginc(ji,jj,jk) &
	462	& + 0.2_wp * ( hdiv(ji+1,jj) - hdiv(ji ,jj) ) * r1_e1u(ji,jj) * umask(ji,jj,jk)
	463	v_bkginc(ji,jj,jk) = v_bkginc(ji,jj,jk) &
	464	& + 0.2_wp * ( hdiv(ji,jj+1) - hdiv(ji,jj ) ) * r1_e2v(ji,jj) * vmask(ji,jj,jk)
[3764]	465	END DO
[3294]	466	END DO
	467	END DO
[5836]	468	!
[3764]	469	END DO
[5836]	470	!
	471	CALL wrk_dealloc( jpi,jpj, hdiv )
	472	!
[3294]	473	ENDIF
	474
	475	!-----------------------------------------------------------------------
[2128]	476	! Allocate and initialize the background state arrays
	477	!-----------------------------------------------------------------------
	478
	479	IF ( ln_asmdin ) THEN
[5836]	480	!
[2128]	481	ALLOCATE( t_bkg(jpi,jpj,jpk) )
	482	ALLOCATE( s_bkg(jpi,jpj,jpk) )
	483	ALLOCATE( u_bkg(jpi,jpj,jpk) )
	484	ALLOCATE( v_bkg(jpi,jpj,jpk) )
	485	ALLOCATE( ssh_bkg(jpi,jpj) )
[5836]	486	!
	487	t_bkg(:,:,:) = 0._wp
	488	s_bkg(:,:,:) = 0._wp
	489	u_bkg(:,:,:) = 0._wp
	490	v_bkg(:,:,:) = 0._wp
	491	ssh_bkg(:,:) = 0._wp
	492	!
[2128]	493	!--------------------------------------------------------------------
	494	! Read from file the background state at analysis time
	495	!--------------------------------------------------------------------
[5836]	496	!
[2128]	497	CALL iom_open( c_asmdin, inum )
[5836]	498	!
[3764]	499	CALL iom_get( inum, 'rdastp', zdate_bkg )
[5836]	500	!
[2128]	501	IF(lwp) THEN
	502	WRITE(numout,*)
[6140]	503	WRITE(numout,*) 'asm_inc_init : Assimilation background state valid at : ', &
	504	& zdate_bkg
[2128]	505	WRITE(numout,*) '~~~~~~~~~~~~'
	506	ENDIF
[5836]	507	!
[6140]	508	IF ( zdate_bkg /= ditdin_date ) &
[2128]	509	& CALL ctl_warn( ' Validity time of assimilation background state does', &
	510	& ' not agree with Direct Initialization time' )
[5836]	511	!
[2128]	512	IF ( ln_trainc ) THEN
	513	CALL iom_get( inum, jpdom_autoglo, 'tn', t_bkg )
	514	CALL iom_get( inum, jpdom_autoglo, 'sn', s_bkg )
	515	t_bkg(:,:,:) = t_bkg(:,:,:) * tmask(:,:,:)
	516	s_bkg(:,:,:) = s_bkg(:,:,:) * tmask(:,:,:)
	517	ENDIF
[5836]	518	!
[2128]	519	IF ( ln_dyninc ) THEN
	520	CALL iom_get( inum, jpdom_autoglo, 'un', u_bkg )
	521	CALL iom_get( inum, jpdom_autoglo, 'vn', v_bkg )
	522	u_bkg(:,:,:) = u_bkg(:,:,:) * umask(:,:,:)
	523	v_bkg(:,:,:) = v_bkg(:,:,:) * vmask(:,:,:)
	524	ENDIF
[5836]	525	!
[2128]	526	IF ( ln_sshinc ) THEN
	527	CALL iom_get( inum, jpdom_autoglo, 'sshn', ssh_bkg )
	528	ssh_bkg(:,:) = ssh_bkg(:,:) * tmask(:,:,1)
	529	ENDIF
[5836]	530	!
[2128]	531	CALL iom_close( inum )
[5836]	532	!
[2128]	533	ENDIF
[2392]	534	!
[2128]	535	END SUBROUTINE asm_inc_init
	536	SUBROUTINE tra_asm_inc( kt )
	537	!!----------------------------------------------------------------------
	538	!! * ROUTINE tra_asm_inc *
	539	!!
	540	!! ** Purpose : Apply the tracer (T and S) assimilation increments
	541	!!
	542	!! ** Method : Direct initialization or Incremental Analysis Updating
	543	!!
	544	!! ** Action :
	545	!!----------------------------------------------------------------------
[5836]	546	INTEGER, INTENT(IN) :: kt ! Current time step
[2392]	547	!
[5836]	548	INTEGER :: ji, jj, jk
	549	INTEGER :: it
[2128]	550	REAL(wp) :: zincwgt ! IAU weight for current time step
[3764]	551	REAL (wp), DIMENSION(jpi,jpj,jpk) :: fzptnz ! 3d freezing point values
[2392]	552	!!----------------------------------------------------------------------
[5836]	553	!
[3764]	554	! freezing point calculation taken from oc_fz_pt (but calculated for all depths)
	555	! used to prevent the applied increments taking the temperature below the local freezing point
[4990]	556	DO jk = 1, jpkm1
[6140]	557	CALL eos_fzp( tsn(:,:,jk,jp_sal), fzptnz(:,:,jk), gdept_n(:,:,jk) )
[4990]	558	END DO
[5836]	559	!
	560	! !--------------------------------------
	561	IF ( ln_asmiau ) THEN ! Incremental Analysis Updating
	562	! !--------------------------------------
	563	!
[2128]	564	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
[5836]	565	!
[2128]	566	it = kt - nit000 + 1
	567	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
[5836]	568	!
[2128]	569	IF(lwp) THEN
	570	WRITE(numout,*)
[4990]	571	WRITE(numout,*) 'tra_asm_inc : Tracer IAU at time step = ', kt,' with IAU weight = ', wgtiau(it)
[2128]	572	WRITE(numout,*) '~~~~~~~~~~~~'
	573	ENDIF
[5836]	574	!
[2128]	575	! Update the tracer tendencies
	576	DO jk = 1, jpkm1
[3764]	577	IF (ln_temnofreeze) THEN
	578	! Do not apply negative increments if the temperature will fall below freezing
	579	WHERE(t_bkginc(:,:,jk) > 0.0_wp .OR. &
	580	& tsn(:,:,jk,jp_tem) + tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * wgtiau(it) > fzptnz(:,:,jk) )
	581	tsa(:,:,jk,jp_tem) = tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * zincwgt
	582	END WHERE
	583	ELSE
	584	tsa(:,:,jk,jp_tem) = tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * zincwgt
	585	ENDIF
	586	IF (ln_salfix) THEN
	587	! Do not apply negative increments if the salinity will fall below a specified
	588	! minimum value salfixmin
	589	WHERE(s_bkginc(:,:,jk) > 0.0_wp .OR. &
	590	& tsn(:,:,jk,jp_sal) + tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * wgtiau(it) > salfixmin )
	591	tsa(:,:,jk,jp_sal) = tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * zincwgt
	592	END WHERE
	593	ELSE
	594	tsa(:,:,jk,jp_sal) = tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * zincwgt
	595	ENDIF
[2128]	596	END DO
[5836]	597	!
[2128]	598	ENDIF
[5836]	599	!
[2128]	600	IF ( kt == nitiaufin_r + 1 ) THEN ! For bias crcn to work
	601	DEALLOCATE( t_bkginc )
	602	DEALLOCATE( s_bkginc )
	603	ENDIF
[5836]	604	! !--------------------------------------
	605	ELSEIF ( ln_asmdin ) THEN ! Direct Initialization
	606	! !--------------------------------------
	607	!
[2128]	608	IF ( kt == nitdin_r ) THEN
[5836]	609	!
[2128]	610	neuler = 0 ! Force Euler forward step
[5836]	611	!
[2128]	612	! Initialize the now fields with the background + increment
[3764]	613	IF (ln_temnofreeze) THEN
	614	! Do not apply negative increments if the temperature will fall below freezing
[4990]	615	WHERE( t_bkginc(:,:,:) > 0.0_wp .OR. tsn(:,:,:,jp_tem) + t_bkginc(:,:,:) > fzptnz(:,:,:) )
[3764]	616	tsn(:,:,:,jp_tem) = t_bkg(:,:,:) + t_bkginc(:,:,:)
	617	END WHERE
	618	ELSE
	619	tsn(:,:,:,jp_tem) = t_bkg(:,:,:) + t_bkginc(:,:,:)
	620	ENDIF
[2128]	621	IF (ln_salfix) THEN
[3764]	622	! Do not apply negative increments if the salinity will fall below a specified
	623	! minimum value salfixmin
[4990]	624	WHERE( s_bkginc(:,:,:) > 0.0_wp .OR. tsn(:,:,:,jp_sal) + s_bkginc(:,:,:) > salfixmin )
[3764]	625	tsn(:,:,:,jp_sal) = s_bkg(:,:,:) + s_bkginc(:,:,:)
	626	END WHERE
	627	ELSE
	628	tsn(:,:,:,jp_sal) = s_bkg(:,:,:) + s_bkginc(:,:,:)
[2128]	629	ENDIF
	630
[4990]	631	tsb(:,:,:,:) = tsn(:,:,:,:) ! Update before fields
[2128]	632
[4990]	633	CALL eos( tsb, rhd, rhop, gdept_0(:,:,:) ) ! Before potential and in situ densities
	634	!!gm fabien
	635	! CALL eos( tsb, rhd, rhop ) ! Before potential and in situ densities
	636	!!gm
	637
[6140]	638	IF( ln_zps .AND. .NOT. lk_c1d .AND. .NOT. ln_isfcav) &
	639	& CALL zps_hde ( kt, jpts, tsb, gtsu, gtsv, & ! Partial steps: before horizontal gradient
	640	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
	641	IF( ln_zps .AND. .NOT. lk_c1d .AND. ln_isfcav) &
	642	& CALL zps_hde_isf( nit000, jpts, tsb, gtsu, gtsv, gtui, gtvi, & ! Partial steps for top cell (ISF)
	643	& rhd, gru , grv , grui, grvi ) ! of t, s, rd at the last ocean level
	644
[2128]	645	DEALLOCATE( t_bkginc )
	646	DEALLOCATE( s_bkginc )
	647	DEALLOCATE( t_bkg )
	648	DEALLOCATE( s_bkg )
	649	ENDIF
[2392]	650	!
[2128]	651	ENDIF
[3764]	652	! Perhaps the following call should be in step
[5836]	653	IF ( ln_seaiceinc ) CALL seaice_asm_inc ( kt ) ! apply sea ice concentration increment
[2392]	654	!
[2128]	655	END SUBROUTINE tra_asm_inc
	656
[2392]	657
[2128]	658	SUBROUTINE dyn_asm_inc( kt )
	659	!!----------------------------------------------------------------------
	660	!! * ROUTINE dyn_asm_inc *
	661	!!
	662	!! ** Purpose : Apply the dynamics (u and v) assimilation increments.
	663	!!
	664	!! ** Method : Direct initialization or Incremental Analysis Updating.
	665	!!
	666	!! ** Action :
	667	!!----------------------------------------------------------------------
	668	INTEGER, INTENT(IN) :: kt ! Current time step
[2392]	669	!
[2128]	670	INTEGER :: jk
	671	INTEGER :: it
	672	REAL(wp) :: zincwgt ! IAU weight for current time step
[2392]	673	!!----------------------------------------------------------------------
[5836]	674	!
	675	! !--------------------------------------------
	676	IF ( ln_asmiau ) THEN ! Incremental Analysis Updating
	677	! !--------------------------------------------
	678	!
[2128]	679	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
[5836]	680	!
[2128]	681	it = kt - nit000 + 1
	682	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
[5836]	683	!
[2128]	684	IF(lwp) THEN
	685	WRITE(numout,*)
[5836]	686	WRITE(numout,*) 'dyn_asm_inc : Dynamics IAU at time step = ', kt,' with IAU weight = ', wgtiau(it)
[2128]	687	WRITE(numout,*) '~~~~~~~~~~~~'
	688	ENDIF
[5836]	689	!
[2128]	690	! Update the dynamic tendencies
	691	DO jk = 1, jpkm1
	692	ua(:,:,jk) = ua(:,:,jk) + u_bkginc(:,:,jk) * zincwgt
	693	va(:,:,jk) = va(:,:,jk) + v_bkginc(:,:,jk) * zincwgt
	694	END DO
[5836]	695	!
[2128]	696	IF ( kt == nitiaufin_r ) THEN
	697	DEALLOCATE( u_bkginc )
	698	DEALLOCATE( v_bkginc )
	699	ENDIF
[5836]	700	!
[2128]	701	ENDIF
[5836]	702	! !-----------------------------------------
	703	ELSEIF ( ln_asmdin ) THEN ! Direct Initialization
	704	! !-----------------------------------------
	705	!
[2128]	706	IF ( kt == nitdin_r ) THEN
[5836]	707	!
[2128]	708	neuler = 0 ! Force Euler forward step
[5836]	709	!
[2128]	710	! Initialize the now fields with the background + increment
	711	un(:,:,:) = u_bkg(:,:,:) + u_bkginc(:,:,:)
	712	vn(:,:,:) = v_bkg(:,:,:) + v_bkginc(:,:,:)
[5836]	713	!
[2128]	714	ub(:,:,:) = un(:,:,:) ! Update before fields
	715	vb(:,:,:) = vn(:,:,:)
[5836]	716	!
[2128]	717	DEALLOCATE( u_bkg )
	718	DEALLOCATE( v_bkg )
	719	DEALLOCATE( u_bkginc )
	720	DEALLOCATE( v_bkginc )
	721	ENDIF
[2392]	722	!
[2128]	723	ENDIF
[2392]	724	!
[2128]	725	END SUBROUTINE dyn_asm_inc
	726
[2392]	727
[2128]	728	SUBROUTINE ssh_asm_inc( kt )
	729	!!----------------------------------------------------------------------
	730	!! * ROUTINE ssh_asm_inc *
	731	!!
	732	!! ** Purpose : Apply the sea surface height assimilation increment.
	733	!!
	734	!! ** Method : Direct initialization or Incremental Analysis Updating.
	735	!!
	736	!! ** Action :
	737	!!----------------------------------------------------------------------
	738	INTEGER, INTENT(IN) :: kt ! Current time step
[2392]	739	!
[2128]	740	INTEGER :: it
[3764]	741	INTEGER :: jk
[2128]	742	REAL(wp) :: zincwgt ! IAU weight for current time step
[2392]	743	!!----------------------------------------------------------------------
[5836]	744	!
	745	! !-----------------------------------------
	746	IF ( ln_asmiau ) THEN ! Incremental Analysis Updating
	747	! !-----------------------------------------
	748	!
[2128]	749	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
[5836]	750	!
[2128]	751	it = kt - nit000 + 1
	752	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
[5836]	753	!
[2128]	754	IF(lwp) THEN
	755	WRITE(numout,*)
	756	WRITE(numout,*) 'ssh_asm_inc : SSH IAU at time step = ', &
	757	& kt,' with IAU weight = ', wgtiau(it)
	758	WRITE(numout,*) '~~~~~~~~~~~~'
	759	ENDIF
[5836]	760	!
[2128]	761	! Save the tendency associated with the IAU weighted SSH increment
	762	! (applied in dynspg.*)
	763	#if defined key_asminc
	764	ssh_iau(:,:) = ssh_bkginc(:,:) * zincwgt
	765	#endif
	766	IF ( kt == nitiaufin_r ) THEN
	767	DEALLOCATE( ssh_bkginc )
	768	ENDIF
[5836]	769	!
[8547]	770	ELSE IF( kt == nitiaufin_r+1 ) THEN
[8546]	771	!
	772	ssh_iau(:,:) = 0._wp
	773	!
[2128]	774	ENDIF
[5836]	775	! !-----------------------------------------
	776	ELSEIF ( ln_asmdin ) THEN ! Direct Initialization
	777	! !-----------------------------------------
	778	!
[2128]	779	IF ( kt == nitdin_r ) THEN
[5836]	780	!
	781	neuler = 0 ! Force Euler forward step
	782	!
	783	sshn(:,:) = ssh_bkg(:,:) + ssh_bkginc(:,:) ! Initialize the now fields the background + increment
	784	!
	785	sshb(:,:) = sshn(:,:) ! Update before fields
[6140]	786	e3t_b(:,:,:) = e3t_n(:,:,:)
	787	!!gm why not e3u_b, e3v_b, gdept_b ????
[5836]	788	!
[2128]	789	DEALLOCATE( ssh_bkg )
	790	DEALLOCATE( ssh_bkginc )
[5836]	791	!
[2128]	792	ENDIF
[2392]	793	!
[2128]	794	ENDIF
[2392]	795	!
[2128]	796	END SUBROUTINE ssh_asm_inc
	797
[3785]	798
[3764]	799	SUBROUTINE seaice_asm_inc( kt, kindic )
	800	!!----------------------------------------------------------------------
	801	!! * ROUTINE seaice_asm_inc *
	802	!!
	803	!! ** Purpose : Apply the sea ice assimilation increment.
	804	!!
	805	!! ** Method : Direct initialization or Incremental Analysis Updating.
	806	!!
	807	!! ** Action :
	808	!!
	809	!!----------------------------------------------------------------------
[5836]	810	INTEGER, INTENT(in) :: kt ! Current time step
[3785]	811	INTEGER, INTENT(in), OPTIONAL :: kindic ! flag for disabling the deallocation
	812	!
	813	INTEGER :: it
	814	REAL(wp) :: zincwgt ! IAU weight for current time step
	815	#if defined key_lim2
	816	REAL(wp), DIMENSION(jpi,jpj) :: zofrld, zohicif, zseaicendg, zhicifinc ! LIM
	817	REAL(wp) :: zhicifmin = 0.5_wp ! ice minimum depth in metres
[3764]	818	#endif
[3785]	819	!!----------------------------------------------------------------------
[5836]	820	!
	821	! !-----------------------------------------
	822	IF ( ln_asmiau ) THEN ! Incremental Analysis Updating
	823	! !-----------------------------------------
	824	!
[3764]	825	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
[5836]	826	!
[3764]	827	it = kt - nit000 + 1
	828	zincwgt = wgtiau(it) ! IAU weight for the current time step
	829	! note this is not a tendency so should not be divided by rdt (as with the tracer and other increments)
[5836]	830	!
[3764]	831	IF(lwp) THEN
	832	WRITE(numout,*)
[5836]	833	WRITE(numout,*) 'seaice_asm_inc : sea ice conc IAU at time step = ', kt,' with IAU weight = ', wgtiau(it)
[3764]	834	WRITE(numout,*) '~~~~~~~~~~~~'
	835	ENDIF
[5836]	836	!
[3785]	837	! Sea-ice : LIM-3 case (to add)
[5836]	838	!
[3785]	839	#if defined key_lim2
	840	! Sea-ice : LIM-2 case
	841	zofrld (:,:) = frld(:,:)
	842	zohicif(:,:) = hicif(:,:)
	843	!
	844	frld = MIN( MAX( frld (:,:) - seaice_bkginc(:,:) * zincwgt, 0.0_wp), 1.0_wp)
[3764]	845	pfrld = MIN( MAX( pfrld(:,:) - seaice_bkginc(:,:) * zincwgt, 0.0_wp), 1.0_wp)
	846	fr_i(:,:) = 1.0_wp - frld(:,:) ! adjust ice fraction
[3785]	847	!
	848	zseaicendg(:,:) = zofrld(:,:) - frld(:,:) ! find out actual sea ice nudge applied
	849	!
[3764]	850	! Nudge sea ice depth to bring it up to a required minimum depth
	851	WHERE( zseaicendg(:,:) > 0.0_wp .AND. hicif(:,:) < zhicifmin )
	852	zhicifinc(:,:) = (zhicifmin - hicif(:,:)) * zincwgt
	853	ELSEWHERE
	854	zhicifinc(:,:) = 0.0_wp
	855	END WHERE
[3785]	856	!
	857	! nudge ice depth
	858	hicif (:,:) = hicif (:,:) + zhicifinc(:,:)
	859	phicif(:,:) = phicif(:,:) + zhicifinc(:,:)
	860	!
	861	! seaice salinity balancing (to add)
[3764]	862	#endif
	863
[4245]	864	#if defined key_cice && defined key_asminc
[3785]	865	! Sea-ice : CICE case. Pass ice increment tendency into CICE
[3764]	866	ndaice_da(:,:) = seaice_bkginc(:,:) * zincwgt / rdt
	867	#endif
	868
	869	IF ( kt == nitiaufin_r ) THEN
	870	DEALLOCATE( seaice_bkginc )
	871	ENDIF
	872
	873	ELSE
	874
[4245]	875	#if defined key_cice && defined key_asminc
[5836]	876	ndaice_da(:,:) = 0._wp ! Sea-ice : CICE case. Zero ice increment tendency into CICE
[3764]	877	#endif
	878
	879	ENDIF
[5836]	880	! !-----------------------------------------
	881	ELSEIF ( ln_asmdin ) THEN ! Direct Initialization
	882	! !-----------------------------------------
	883	!
[3764]	884	IF ( kt == nitdin_r ) THEN
[5836]	885	!
[3764]	886	neuler = 0 ! Force Euler forward step
[5836]	887	!
[3785]	888	! Sea-ice : LIM-3 case (to add)
[5836]	889	!
[3785]	890	#if defined key_lim2
	891	! Sea-ice : LIM-2 case.
[3764]	892	zofrld(:,:)=frld(:,:)
	893	zohicif(:,:)=hicif(:,:)
[3785]	894	!
[3764]	895	! Initialize the now fields the background + increment
[3785]	896	frld (:,:) = MIN( MAX( frld(:,:) - seaice_bkginc(:,:), 0.0_wp), 1.0_wp)
[3764]	897	pfrld(:,:) = frld(:,:)
[3785]	898	fr_i (:,:) = 1.0_wp - frld(:,:) ! adjust ice fraction
	899	zseaicendg(:,:) = zofrld(:,:) - frld(:,:) ! find out actual sea ice nudge applied
	900	!
[3764]	901	! Nudge sea ice depth to bring it up to a required minimum depth
	902	WHERE( zseaicendg(:,:) > 0.0_wp .AND. hicif(:,:) < zhicifmin )
	903	zhicifinc(:,:) = (zhicifmin - hicif(:,:)) * zincwgt
	904	ELSEWHERE
[5836]	905	zhicifinc(:,:) = 0._wp
[3764]	906	END WHERE
[3785]	907	!
	908	! nudge ice depth
	909	hicif (:,:) = hicif (:,:) + zhicifinc(:,:)
	910	phicif(:,:) = phicif(:,:)
	911	!
	912	! seaice salinity balancing (to add)
[3764]	913	#endif
[5836]	914	!
[4245]	915	#if defined key_cice && defined key_asminc
	916	! Sea-ice : CICE case. Pass ice increment tendency into CICE
[3764]	917	ndaice_da(:,:) = seaice_bkginc(:,:) / rdt
	918	#endif
[5836]	919	IF ( .NOT. PRESENT(kindic) ) THEN
	920	DEALLOCATE( seaice_bkginc )
	921	END IF
	922	!
[3764]	923	ELSE
[5836]	924	!
	925	#if defined key_cice && defined key_asminc
	926	ndaice_da(:,:) = 0._wp ! Sea-ice : CICE case. Zero ice increment tendency into CICE
[3764]	927
	928	#endif
[5836]	929	!
[3764]	930	ENDIF
	931
[3785]	932	!#if defined defined key_lim2 \|\| defined key_cice
[3764]	933	!
	934	! IF (ln_seaicebal ) THEN
	935	! !! balancing salinity increments
	936	! !! simple case from limflx.F90 (doesn't include a mass flux)
	937	! !! assumption is that as ice concentration is reduced or increased
	938	! !! the snow and ice depths remain constant
	939	! !! note that snow is being created where ice concentration is being increased
	940	! !! - could be more sophisticated and
	941	! !! not do this (but would need to alter h_snow)
	942	!
	943	! usave(:,:,:)=sb(:,:,:) ! use array as a temporary store
	944	!
	945	! DO jj = 1, jpj
	946	! DO ji = 1, jpi
	947	! ! calculate change in ice and snow mass per unit area
	948	! ! positive values imply adding salt to the ocean (results from ice formation)
	949	! ! fwf : ice formation and melting
	950	!
	951	! zfons = ( -nfresh_da(ji,jj)soce + nfsalt_da(ji,jj) )rdt
	952	!
	953	! ! change salinity down to mixed layer depth
	954	! mld=hmld_kara(ji,jj)
	955	!
	956	! ! prevent small mld
	957	! ! less than 10m can cause salinity instability
	958	! IF (mld < 10) mld=10
	959	!
	960	! ! set to bottom of a level
	961	! DO jk = jpk-1, 2, -1
	962	! IF ((mld > gdepw(ji,jj,jk)) .and. (mld < gdepw(ji,jj,jk+1))) THEN
	963	! mld=gdepw(ji,jj,jk+1)
	964	! jkmax=jk
	965	! ENDIF
	966	! ENDDO
	967	!
	968	! ! avoid applying salinity balancing in shallow water or on land
	969	! !
	970	!
	971	! ! dsal_ocn (psu kg m^-2) / (kg m^-3 * m)
	972	!
	973	! dsal_ocn=0.0_wp
	974	! sal_thresh=5.0_wp ! minimum salinity threshold for salinity balancing
	975	!
	976	! if (tmask(ji,jj,1) > 0 .AND. tmask(ji,jj,jkmax) > 0 ) &
	977	! dsal_ocn = zfons / (rhop(ji,jj,1) * mld)
	978	!
	979	! ! put increments in for levels in the mixed layer
	980	! ! but prevent salinity below a threshold value
	981	!
	982	! DO jk = 1, jkmax
	983	!
	984	! IF (dsal_ocn > 0.0_wp .or. sb(ji,jj,jk)+dsal_ocn > sal_thresh) THEN
	985	! sb(ji,jj,jk) = sb(ji,jj,jk) + dsal_ocn
	986	! sn(ji,jj,jk) = sn(ji,jj,jk) + dsal_ocn
	987	! ENDIF
	988	!
	989	! ENDDO
	990	!
	991	! ! ! salt exchanges at the ice/ocean interface
	992	! ! zpmess = zfons / rdt_ice ! rdt_ice is ice timestep
	993	! !
	994	! !! Adjust fsalt. A +ve fsalt means adding salt to ocean
	995	! !! fsalt(ji,jj) = fsalt(ji,jj) + zpmess ! adjust fsalt
	996	! !!
	997	! !! emps(ji,jj) = emps(ji,jj) + zpmess ! or adjust emps (see icestp1d)
	998	! !! ! E-P (kg m-2 s-2)
	999	! ! emp(ji,jj) = emp(ji,jj) + zpmess ! E-P (kg m-2 s-2)
	1000	! ENDDO !ji
	1001	! ENDDO !jj!
	1002	!
	1003	! ENDIF !ln_seaicebal
	1004	!
	1005	!#endif
[5836]	1006	!
[3764]	1007	ENDIF
[5836]	1008	!
[3764]	1009	END SUBROUTINE seaice_asm_inc
[3785]	1010
[2392]	1011	!!======================================================================
[2128]	1012	END MODULE asminc

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