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asminc.F90 in branches/UKMO/dev_r5518_GO6_package_asm_surf_bgc/NEMOGCM/NEMO/OPA_SRC/ASM – NEMO

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source: branches/UKMO/dev_r5518_GO6_package_asm_surf_bgc/NEMOGCM/NEMO/OPA_SRC/ASM/asminc.F90 @ 8436

Last change on this file since 8436 was 8436, checked in by dford, 7 years ago
Implement initial version of surface chlorophyll assimilation for MEDUSA.
File size: 60.9 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
[2392]	13	!!----------------------------------------------------------------------
[2128]	14
	15	!!----------------------------------------------------------------------
[3785]	16	!! 'key_asminc' : Switch on the assimilation increment interface
[2128]	17	!!----------------------------------------------------------------------
[3785]	18	!! asm_inc_init : Initialize the increment arrays and IAU weights
	19	!! calc_date : Compute the calendar date YYYYMMDD on a given step
	20	!! tra_asm_inc : Apply the tracer (T and S) increments
	21	!! dyn_asm_inc : Apply the dynamic (u and v) increments
	22	!! ssh_asm_inc : Apply the SSH increment
	23	!! seaice_asm_inc : Apply the seaice increment
[8428]	24	!! logchl_asm_inc : Apply the logchl increment
[2128]	25	!!----------------------------------------------------------------------
[3294]	26	USE wrk_nemo ! Memory Allocation
[2392]	27	USE par_oce ! Ocean space and time domain variables
	28	USE dom_oce ! Ocean space and time domain
[3785]	29	USE domvvl ! domain: variable volume level
[2392]	30	USE oce ! Dynamics and active tracers defined in memory
[3294]	31	USE ldfdyn_oce ! ocean dynamics: lateral physics
[2392]	32	USE eosbn2 ! Equation of state - in situ and potential density
	33	USE zpshde ! Partial step : Horizontal Derivative
	34	USE iom ! Library to read input files
	35	USE asmpar ! Parameters for the assmilation interface
[2435]	36	USE c1d ! 1D initialization
[2715]	37	USE in_out_manager ! I/O manager
[3764]	38	USE lib_mpp ! MPP library
	39	#if defined key_lim2
	40	USE ice_2 ! LIM2
	41	#endif
[8400]	42	#if defined key_cice && defined key_asminc
	43	USE sbc_ice, ONLY : & ! CICE Ice model variables
	44	& ndaice_da, nfresh_da, nfsalt_da
	45	#endif
[3764]	46	USE sbc_oce ! Surface boundary condition variables.
[8428]	47	USE zdfmxl, ONLY : &
	48	! & hmld_tref, &
	49	#if defined key_karaml
	50	& hmld_kara, &
	51	& ln_kara, &
	52	#endif
	53	& hmld, &
	54	& hmlp, &
	55	& hmlpt
	56	#if defined key_top
	57	USE trc, ONLY: &
	58	& trn, &
	59	& trb
	60	USE par_trc, ONLY: &
	61	& jptra
	62	#endif
	63	#if defined key_medusa && defined key_foam_medusa
	64	USE asmlogchlbal_medusa, ONLY: &
	65	& asm_logchl_bal_medusa
	66	USE par_medusa
	67	#elif defined key_hadocc
	68	USE asmlogchlbal_hadocc, ONLY: &
	69	& asm_logchl_bal_hadocc
	70	USE par_hadocc
	71	#endif
[2128]	72
	73	IMPLICIT NONE
	74	PRIVATE
[2392]	75
	76	PUBLIC asm_inc_init !: Initialize the increment arrays and IAU weights
	77	PUBLIC calc_date !: Compute the calendar date YYYYMMDD on a given step
	78	PUBLIC tra_asm_inc !: Apply the tracer (T and S) increments
	79	PUBLIC dyn_asm_inc !: Apply the dynamic (u and v) increments
	80	PUBLIC ssh_asm_inc !: Apply the SSH increment
[3764]	81	PUBLIC seaice_asm_inc !: Apply the seaice increment
[8428]	82	PUBLIC logchl_asm_inc !: Apply the logchl increment
[2128]	83
	84	#if defined key_asminc
[2392]	85	LOGICAL, PUBLIC, PARAMETER :: lk_asminc = .TRUE. !: Logical switch for assimilation increment interface
[2128]	86	#else
[2392]	87	LOGICAL, PUBLIC, PARAMETER :: lk_asminc = .FALSE. !: No assimilation increments
[2128]	88	#endif
[4998]	89	LOGICAL, PUBLIC :: ln_bkgwri = .FALSE. !: No output of the background state fields
[8428]	90	LOGICAL, PUBLIC :: ln_balwri = .FALSE. !: No output of the assimilation balancing increments
[4998]	91	LOGICAL, PUBLIC :: ln_asmiau = .FALSE. !: No applying forcing with an assimilation increment
	92	LOGICAL, PUBLIC :: ln_asmdin = .FALSE. !: No direct initialization
	93	LOGICAL, PUBLIC :: ln_trainc = .FALSE. !: No tracer (T and S) assimilation increments
	94	LOGICAL, PUBLIC :: ln_dyninc = .FALSE. !: No dynamics (u and v) assimilation increments
	95	LOGICAL, PUBLIC :: ln_sshinc = .FALSE. !: No sea surface height assimilation increment
	96	LOGICAL, PUBLIC :: ln_seaiceinc !: No sea ice concentration increment
[8428]	97	LOGICAL, PUBLIC :: ln_logchlinc = .FALSE. !: No log10(chlorophyll) increment
	98	LOGICAL, PUBLIC :: ln_logchlbal = .FALSE. !: Don't apply multivariate log10(chlorophyll) balancing
[4998]	99	LOGICAL, PUBLIC :: ln_salfix = .FALSE. !: Apply minimum salinity check
[3764]	100	LOGICAL, PUBLIC :: ln_temnofreeze = .FALSE. !: Don't allow the temperature to drop below freezing
[4998]	101	INTEGER, PUBLIC :: nn_divdmp !: Apply divergence damping filter nn_divdmp times
[2128]	102
[2392]	103	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: t_bkg , s_bkg !: Background temperature and salinity
	104	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: u_bkg , v_bkg !: Background u- & v- velocity components
	105	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: t_bkginc, s_bkginc !: Increment to the background T & S
	106	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: u_bkginc, v_bkginc !: Increment to the u- & v-components
	107	REAL(wp), PUBLIC, DIMENSION(:) , ALLOCATABLE :: wgtiau !: IAU weights for each time step
[2128]	108	#if defined key_asminc
[2392]	109	REAL(wp), PUBLIC, DIMENSION(:,:), ALLOCATABLE :: ssh_iau !: IAU-weighted sea surface height increment
[2128]	110	#endif
[2392]	111	! !!! time steps relative to the cycle interval [0,nitend-nit000-1]
	112	INTEGER , PUBLIC :: nitbkg !: Time step of the background state used in the Jb term
	113	INTEGER , PUBLIC :: nitdin !: Time step of the background state for direct initialization
	114	INTEGER , PUBLIC :: nitiaustr !: Time step of the start of the IAU interval
	115	INTEGER , PUBLIC :: nitiaufin !: Time step of the end of the IAU interval
	116	!
	117	INTEGER , PUBLIC :: niaufn !: Type of IAU weighing function: = 0 Constant weighting
	118	! !: = 1 Linear hat-like, centred in middle of IAU interval
	119	REAL(wp), PUBLIC :: salfixmin !: Ensure that the salinity is larger than this value if (ln_salfix)
[2128]	120
[2392]	121	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ssh_bkg, ssh_bkginc ! Background sea surface height and its increment
[3764]	122	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: seaice_bkginc ! Increment to the background sea ice conc
[2128]	123
[8428]	124	REAL(wp), PUBLIC, DIMENSION(:,:), ALLOCATABLE :: logchl_bkginc !: Increment to background logchl
	125	#if defined key_top
	126	REAL(wp), PUBLIC, DIMENSION(:,:,:,:), ALLOCATABLE :: logchl_balinc !: Increment to BGC variables from logchl assim
	127	#endif
[8436]	128	#if defined key_hadocc \|\| (defined key_medusa && defined key_foam_medusa)
	129	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: pgrow_avg_bkg !: Background phyto growth for logchl balancing
	130	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ploss_avg_bkg !: Background phyto loss for logchl balancing
	131	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: phyt_avg_bkg !: Background phyto for logchl balancing
	132	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: mld_max_bkg !: Background max MLD for logchl balancing
	133	#endif
[8428]	134	REAL(wp) :: rn_maxchlinc = -999.0 !: maximum absolute non-log chlorophyll increment from logchl assimilation
	135	!: <= 0 implies no maximum applied (switch turned off)
	136	!: > 0 implies maximum absolute chl increment capped at this value
	137
	138	INTEGER :: mld_choice_bgc = 5 !: choice of mld criteria to use for biogeochemistry assimilation
	139	!: 1) hmld - Turbocline/mixing depth [W points]
	140	!: 2) hmlp - Density criterion (0.01 kg/m^3 change from 10m) [W points]
	141	!: 3) hmld_kara - Kara MLD [Interpolated]
	142	!: 4) hmld_tref - Temperature criterion (0.2 K change from surface) [T points]
	143	!: 5) hmlpt - Density criterion (0.01 kg/m^3 change from 10m) [T points]
	144
[3294]	145	!! * Substitutions
	146	# include "domzgr_substitute.h90"
	147	# include "ldfdyn_substitute.h90"
	148	# include "vectopt_loop_substitute.h90"
[2287]	149	!!----------------------------------------------------------------------
	150	!! NEMO/OPA 3.3 , NEMO Consortium (2010)
	151	!! $Id$
[2392]	152	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[2287]	153	!!----------------------------------------------------------------------
[2128]	154	CONTAINS
	155
	156	SUBROUTINE asm_inc_init
	157	!!----------------------------------------------------------------------
	158	!! * ROUTINE asm_inc_init *
	159	!!
	160	!! ** Purpose : Initialize the assimilation increment and IAU weights.
	161	!!
	162	!! ** Method : Initialize the assimilation increment and IAU weights.
	163	!!
	164	!! ** Action :
	165	!!----------------------------------------------------------------------
[4990]	166	INTEGER :: ji, jj, jk, jt ! dummy loop indices
	167	INTEGER :: imid, inum ! local integers
	168	INTEGER :: ios ! Local integer output status for namelist read
[2128]	169	INTEGER :: iiauper ! Number of time steps in the IAU period
	170	INTEGER :: icycper ! Number of time steps in the cycle
	171	INTEGER :: iitend_date ! Date YYYYMMDD of final time step
	172	INTEGER :: iitbkg_date ! Date YYYYMMDD of background time step for Jb term
	173	INTEGER :: iitdin_date ! Date YYYYMMDD of background time step for DI
	174	INTEGER :: iitiaustr_date ! Date YYYYMMDD of IAU interval start time step
	175	INTEGER :: iitiaufin_date ! Date YYYYMMDD of IAU interval final time step
[4990]	176	!
[2128]	177	REAL(wp) :: znorm ! Normalization factor for IAU weights
[4990]	178	REAL(wp) :: ztotwgt ! Value of time-integrated IAU weights (should be equal to one)
[2128]	179	REAL(wp) :: z_inc_dateb ! Start date of interval on which increment is valid
	180	REAL(wp) :: z_inc_datef ! End date of interval on which increment is valid
	181	REAL(wp) :: zdate_bkg ! Date in background state file for DI
	182	REAL(wp) :: zdate_inc ! Time axis in increments file
[4990]	183	!
	184	REAL(wp), POINTER, DIMENSION(:,:) :: hdiv ! 2D workspace
[2392]	185	!!
[8428]	186	NAMELIST/nam_asminc/ ln_bkgwri, ln_balwri, &
[2392]	187	& ln_trainc, ln_dyninc, ln_sshinc, &
[8428]	188	& ln_logchlinc, ln_logchlbal, &
[2392]	189	& ln_asmdin, ln_asmiau, &
	190	& nitbkg, nitdin, nitiaustr, nitiaufin, niaufn, &
[8400]	191	& ln_salfix, salfixmin, nn_divdmp, &
[8428]	192	& ln_seaiceinc, ln_temnofreeze, &
	193	& mld_choice_bgc, rn_maxchlinc
[2392]	194	!!----------------------------------------------------------------------
[2128]	195
	196	!-----------------------------------------------------------------------
	197	! Read Namelist nam_asminc : assimilation increment interface
	198	!-----------------------------------------------------------------------
[3764]	199	ln_seaiceinc = .FALSE.
	200	ln_temnofreeze = .FALSE.
[2128]	201
[4147]	202	REWIND( numnam_ref ) ! Namelist nam_asminc in reference namelist : Assimilation increment
	203	READ ( numnam_ref, nam_asminc, IOSTAT = ios, ERR = 901)
	204	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nam_asminc in reference namelist', lwp )
[2128]	205
[4147]	206	REWIND( numnam_cfg ) ! Namelist nam_asminc in configuration namelist : Assimilation increment
	207	READ ( numnam_cfg, nam_asminc, IOSTAT = ios, ERR = 902 )
	208	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nam_asminc in configuration namelist', lwp )
[4624]	209	IF(lwm) WRITE ( numond, nam_asminc )
[4147]	210
[2128]	211	! Control print
	212	IF(lwp) THEN
	213	WRITE(numout,*)
	214	WRITE(numout,*) 'asm_inc_init : Assimilation increment initialization :'
	215	WRITE(numout,*) '~~~~~~~~~~~~'
[2392]	216	WRITE(numout,*) ' Namelist namasm : set assimilation increment parameters'
	217	WRITE(numout,*) ' Logical switch for writing out background state ln_bkgwri = ', ln_bkgwri
[8428]	218	WRITE(numout,*) ' Logical switch for writing out balancing increments ln_balwri = ', ln_balwri
[2392]	219	WRITE(numout,*) ' Logical switch for applying tracer increments ln_trainc = ', ln_trainc
	220	WRITE(numout,*) ' Logical switch for applying velocity increments ln_dyninc = ', ln_dyninc
	221	WRITE(numout,*) ' Logical switch for applying SSH increments ln_sshinc = ', ln_sshinc
	222	WRITE(numout,*) ' Logical switch for Direct Initialization (DI) ln_asmdin = ', ln_asmdin
[3764]	223	WRITE(numout,*) ' Logical switch for applying sea ice increments ln_seaiceinc = ', ln_seaiceinc
[8428]	224	WRITE(numout,*) ' Logical switch for applying logchl increments ln_logchlinc = ', ln_logchlinc
	225	WRITE(numout,*) ' Logical switch for logchl multivariate balancing ln_logchlbal = ', ln_logchlbal
[2392]	226	WRITE(numout,*) ' Logical switch for Incremental Analysis Updating (IAU) ln_asmiau = ', ln_asmiau
	227	WRITE(numout,*) ' Timestep of background in [0,nitend-nit000-1] nitbkg = ', nitbkg
	228	WRITE(numout,*) ' Timestep of background for DI in [0,nitend-nit000-1] nitdin = ', nitdin
	229	WRITE(numout,*) ' Timestep of start of IAU interval in [0,nitend-nit000-1] nitiaustr = ', nitiaustr
	230	WRITE(numout,*) ' Timestep of end of IAU interval in [0,nitend-nit000-1] nitiaufin = ', nitiaufin
	231	WRITE(numout,*) ' Type of IAU weighting function niaufn = ', niaufn
	232	WRITE(numout,*) ' Logical switch for ensuring that the sa > salfixmin ln_salfix = ', ln_salfix
	233	WRITE(numout,*) ' Minimum salinity after applying the increments salfixmin = ', salfixmin
[8428]	234	WRITE(numout,*) ' Choice of MLD for BGC assimilation mld_choice_bgc = ', mld_choice_bgc
	235	WRITE(numout,*) ' Maximum absolute chlorophyll increment (<=0 = off) rn_maxchlinc = ', rn_maxchlinc
[2128]	236	ENDIF
	237
	238	nitbkg_r = nitbkg + nit000 - 1 ! Background time referenced to nit000
	239	nitdin_r = nitdin + nit000 - 1 ! Background time for DI referenced to nit000
	240	nitiaustr_r = nitiaustr + nit000 - 1 ! Start of IAU interval referenced to nit000
	241	nitiaufin_r = nitiaufin + nit000 - 1 ! End of IAU interval referenced to nit000
	242
	243	iiauper = nitiaufin_r - nitiaustr_r + 1 ! IAU interval length
	244	icycper = nitend - nit000 + 1 ! Cycle interval length
	245
[4990]	246	CALL calc_date( nit000, nitend , ndate0, iitend_date ) ! Date of final time step
	247	CALL calc_date( nit000, nitbkg_r , ndate0, iitbkg_date ) ! Background time for Jb referenced to ndate0
	248	CALL calc_date( nit000, nitdin_r , ndate0, iitdin_date ) ! Background time for DI referenced to ndate0
	249	CALL calc_date( nit000, nitiaustr_r, ndate0, iitiaustr_date ) ! IAU start time referenced to ndate0
	250	CALL calc_date( nit000, nitiaufin_r, ndate0, iitiaufin_date ) ! IAU end time referenced to ndate0
	251	!
[2128]	252	IF(lwp) THEN
	253	WRITE(numout,*)
	254	WRITE(numout,*) ' Time steps referenced to current cycle:'
	255	WRITE(numout,*) ' iitrst = ', nit000 - 1
	256	WRITE(numout,*) ' nit000 = ', nit000
	257	WRITE(numout,*) ' nitend = ', nitend
	258	WRITE(numout,*) ' nitbkg_r = ', nitbkg_r
	259	WRITE(numout,*) ' nitdin_r = ', nitdin_r
	260	WRITE(numout,*) ' nitiaustr_r = ', nitiaustr_r
	261	WRITE(numout,*) ' nitiaufin_r = ', nitiaufin_r
	262	WRITE(numout,*)
	263	WRITE(numout,*) ' Dates referenced to current cycle:'
	264	WRITE(numout,*) ' ndastp = ', ndastp
	265	WRITE(numout,*) ' ndate0 = ', ndate0
	266	WRITE(numout,*) ' iitend_date = ', iitend_date
	267	WRITE(numout,*) ' iitbkg_date = ', iitbkg_date
	268	WRITE(numout,*) ' iitdin_date = ', iitdin_date
	269	WRITE(numout,*) ' iitiaustr_date = ', iitiaustr_date
	270	WRITE(numout,*) ' iitiaufin_date = ', iitiaufin_date
	271	ENDIF
	272
	273	IF ( nacc /= 0 ) &
	274	& CALL ctl_stop( ' nacc /= 0 and key_asminc :', &
	275	& ' Assimilation increments have only been implemented', &
	276	& ' for synchronous time stepping' )
	277
	278	IF ( ( ln_asmdin ).AND.( ln_asmiau ) ) &
	279	& CALL ctl_stop( ' ln_asmdin and ln_asmiau :', &
	280	& ' Choose Direct Initialization OR Incremental Analysis Updating')
	281
	282	IF ( ( ( .NOT. ln_asmdin ).AND.( .NOT. ln_asmiau ) ) &
[8428]	283	& .AND.( ( ln_trainc ).OR.( ln_dyninc ).OR.( ln_sshinc ).OR.( ln_seaiceinc ).OR. &
	284	& ( ln_logchlinc ) )) &
	285	& CALL ctl_stop( ' One or more of ln_trainc, ln_dyninc, ln_sshinc, ln_seaiceinc,', &
	286	& ' and ln_logchlinc is set to .true.', &
[2128]	287	& ' but ln_asmdin and ln_asmiau are both set to .false. :', &
	288	& ' Inconsistent options')
	289
	290	IF ( ( niaufn /= 0 ).AND.( niaufn /= 1 ) ) &
	291	& CALL ctl_stop( ' niaufn /= 0 or niaufn /=1 :', &
	292	& ' Type IAU weighting function is invalid')
	293
[3764]	294	IF ( ( .NOT. ln_trainc ).AND.( .NOT. ln_dyninc ).AND.( .NOT. ln_sshinc ).AND.( .NOT. ln_seaiceinc ) &
[8428]	295	& .AND.( .NOT. ln_logchlinc ) ) &
	296	& CALL ctl_warn( ' ln_trainc, ln_dyninc, ln_sshinc, ln_seaiceinc,', &
	297	& ' and ln_logchlinc are set to .false. :', &
[2128]	298	& ' The assimilation increments are not applied')
	299
	300	IF ( ( ln_asmiau ).AND.( nitiaustr == nitiaufin ) ) &
	301	& CALL ctl_stop( ' nitiaustr = nitiaufin :', &
	302	& ' IAU interval is of zero length')
	303
	304	IF ( ( ln_asmiau ).AND.( ( nitiaustr_r < nit000 ).OR.( nitiaufin_r > nitend ) ) ) &
	305	& CALL ctl_stop( ' nitiaustr or nitiaufin :', &
	306	& ' IAU starting or final time step is outside the cycle interval', &
	307	& ' Valid range nit000 to nitend')
	308
	309	IF ( ( nitbkg_r < nit000 - 1 ).OR.( nitbkg_r > nitend ) ) &
	310	& CALL ctl_stop( ' nitbkg :', &
	311	& ' Background time step is outside the cycle interval')
	312
	313	IF ( ( nitdin_r < nit000 - 1 ).OR.( nitdin_r > nitend ) ) &
	314	& CALL ctl_stop( ' nitdin :', &
	315	& ' Background time step for Direct Initialization is outside', &
	316	& ' the cycle interval')
	317
[8428]	318	IF ( ( ln_balwri ).AND.( .NOT. ( ln_logchlinc ) ) ) THEN
	319	CALL ctl_warn( ' Balancing increments are only calculated for logchl', &
	320	& ' Not assimilating logchl, so ln_balwri will be set to .false.')
	321	ln_balwri = .FALSE.
	322	ENDIF
	323
	324	IF ( ( ln_logchlbal ).AND.( .NOT. ( ln_logchlinc ) ) ) THEN
	325	CALL ctl_warn( ' Cannot calculate logchl balancing increments if not assimilating logchl', &
	326	& ' Not assimilating logchl, so ln_logchlbal will be set to .false.')
	327	ln_logchlbal = .FALSE.
	328	ENDIF
	329
[2128]	330	IF ( nstop > 0 ) RETURN ! if there are any errors then go no further
	331
	332	!--------------------------------------------------------------------
	333	! Initialize the Incremental Analysis Updating weighting function
	334	!--------------------------------------------------------------------
	335
	336	IF ( ln_asmiau ) THEN
	337
	338	ALLOCATE( wgtiau( icycper ) )
	339
	340	wgtiau(:) = 0.0
	341
	342	IF ( niaufn == 0 ) THEN
	343
	344	!---------------------------------------------------------
	345	! Constant IAU forcing
	346	!---------------------------------------------------------
	347
	348	DO jt = 1, iiauper
	349	wgtiau(jt+nitiaustr-1) = 1.0 / REAL( iiauper )
	350	END DO
	351
	352	ELSEIF ( niaufn == 1 ) THEN
	353
	354	!---------------------------------------------------------
	355	! Linear hat-like, centred in middle of IAU interval
	356	!---------------------------------------------------------
	357
	358	! Compute the normalization factor
	359	znorm = 0.0
	360	IF ( MOD( iiauper, 2 ) == 0 ) THEN ! Even number of time steps in IAU interval
	361	imid = iiauper / 2
	362	DO jt = 1, imid
	363	znorm = znorm + REAL( jt )
	364	END DO
	365	znorm = 2.0 * znorm
	366	ELSE ! Odd number of time steps in IAU interval
	367	imid = ( iiauper + 1 ) / 2
	368	DO jt = 1, imid - 1
	369	znorm = znorm + REAL( jt )
	370	END DO
	371	znorm = 2.0 * znorm + REAL( imid )
	372	ENDIF
	373	znorm = 1.0 / znorm
	374
	375	DO jt = 1, imid - 1
	376	wgtiau(jt+nitiaustr-1) = REAL( jt ) * znorm
	377	END DO
	378	DO jt = imid, iiauper
	379	wgtiau(jt+nitiaustr-1) = REAL( iiauper - jt + 1 ) * znorm
	380	END DO
	381
	382	ENDIF
	383
	384	! Test that the integral of the weights over the weighting interval equals 1
	385	IF(lwp) THEN
	386	WRITE(numout,*)
	387	WRITE(numout,*) 'asm_inc_init : IAU weights'
	388	WRITE(numout,*) '~~~~~~~~~~~~'
	389	WRITE(numout,*) ' time step IAU weight'
	390	WRITE(numout,*) ' ========= ====================='
	391	ztotwgt = 0.0
	392	DO jt = 1, icycper
	393	ztotwgt = ztotwgt + wgtiau(jt)
	394	WRITE(numout,*) ' ', jt, ' ', wgtiau(jt)
	395	END DO
	396	WRITE(numout,*) ' ==================================='
	397	WRITE(numout,*) ' Time-integrated weight = ', ztotwgt
	398	WRITE(numout,*) ' ==================================='
	399	ENDIF
	400
	401	ENDIF
	402
	403	!--------------------------------------------------------------------
	404	! Allocate and initialize the increment arrays
	405	!--------------------------------------------------------------------
	406
	407	ALLOCATE( t_bkginc(jpi,jpj,jpk) )
	408	ALLOCATE( s_bkginc(jpi,jpj,jpk) )
	409	ALLOCATE( u_bkginc(jpi,jpj,jpk) )
	410	ALLOCATE( v_bkginc(jpi,jpj,jpk) )
	411	ALLOCATE( ssh_bkginc(jpi,jpj) )
[3764]	412	ALLOCATE( seaice_bkginc(jpi,jpj))
[2128]	413	#if defined key_asminc
	414	ALLOCATE( ssh_iau(jpi,jpj) )
	415	#endif
	416	t_bkginc(:,:,:) = 0.0
	417	s_bkginc(:,:,:) = 0.0
	418	u_bkginc(:,:,:) = 0.0
	419	v_bkginc(:,:,:) = 0.0
	420	ssh_bkginc(:,:) = 0.0
[3764]	421	seaice_bkginc(:,:) = 0.0
[2128]	422	#if defined key_asminc
	423	ssh_iau(:,:) = 0.0
	424	#endif
[8428]	425	IF ( ln_logchlinc ) THEN
	426	ALLOCATE( logchl_bkginc(jpi,jpj) )
	427	logchl_bkginc(:,:) = 0.0
	428	#if defined key_top
	429	ALLOCATE( logchl_balinc(jpi,jpj,jpk,jptra) )
	430	logchl_balinc(:,:,:,:) = 0.0
	431	#endif
	432	ENDIF
	433	IF ( ( ln_trainc ).OR.( ln_dyninc ).OR.( ln_sshinc ).OR.( ln_seaiceinc ) &
	434	& .OR.( ln_logchlinc ) ) THEN
[2128]	435
	436	!--------------------------------------------------------------------
	437	! Read the increments from file
	438	!--------------------------------------------------------------------
	439
	440	CALL iom_open( c_asminc, inum )
	441
	442	CALL iom_get( inum, 'time', zdate_inc )
	443
	444	CALL iom_get( inum, 'z_inc_dateb', z_inc_dateb )
	445	CALL iom_get( inum, 'z_inc_datef', z_inc_datef )
	446	z_inc_dateb = zdate_inc
	447	z_inc_datef = zdate_inc
	448
	449	IF(lwp) THEN
	450	WRITE(numout,*)
	451	WRITE(numout,*) 'asm_inc_init : Assimilation increments valid ', &
	452	& ' between dates ', NINT( z_inc_dateb ),' and ', &
	453	& NINT( z_inc_datef )
	454	WRITE(numout,*) '~~~~~~~~~~~~'
	455	ENDIF
	456
	457	IF ( ( NINT( z_inc_dateb ) < ndastp ) &
	458	& .OR.( NINT( z_inc_datef ) > iitend_date ) ) &
	459	& CALL ctl_warn( ' Validity time of assimilation increments is ', &
	460	& ' outside the assimilation interval' )
	461
	462	IF ( ( ln_asmdin ).AND.( NINT( zdate_inc ) /= iitdin_date ) ) &
	463	& CALL ctl_warn( ' Validity time of assimilation increments does ', &
	464	& ' not agree with Direct Initialization time' )
	465
	466	IF ( ln_trainc ) THEN
	467	CALL iom_get( inum, jpdom_autoglo, 'bckint', t_bkginc, 1 )
	468	CALL iom_get( inum, jpdom_autoglo, 'bckins', s_bkginc, 1 )
	469	! Apply the masks
	470	t_bkginc(:,:,:) = t_bkginc(:,:,:) * tmask(:,:,:)
	471	s_bkginc(:,:,:) = s_bkginc(:,:,:) * tmask(:,:,:)
	472	! Set missing increments to 0.0 rather than 1e+20
	473	! to allow for differences in masks
	474	WHERE( ABS( t_bkginc(:,:,:) ) > 1.0e+10 ) t_bkginc(:,:,:) = 0.0
	475	WHERE( ABS( s_bkginc(:,:,:) ) > 1.0e+10 ) s_bkginc(:,:,:) = 0.0
	476	ENDIF
	477
	478	IF ( ln_dyninc ) THEN
	479	CALL iom_get( inum, jpdom_autoglo, 'bckinu', u_bkginc, 1 )
	480	CALL iom_get( inum, jpdom_autoglo, 'bckinv', v_bkginc, 1 )
	481	! Apply the masks
	482	u_bkginc(:,:,:) = u_bkginc(:,:,:) * umask(:,:,:)
	483	v_bkginc(:,:,:) = v_bkginc(:,:,:) * vmask(:,:,:)
	484	! Set missing increments to 0.0 rather than 1e+20
	485	! to allow for differences in masks
	486	WHERE( ABS( u_bkginc(:,:,:) ) > 1.0e+10 ) u_bkginc(:,:,:) = 0.0
	487	WHERE( ABS( v_bkginc(:,:,:) ) > 1.0e+10 ) v_bkginc(:,:,:) = 0.0
	488	ENDIF
	489
	490	IF ( ln_sshinc ) THEN
	491	CALL iom_get( inum, jpdom_autoglo, 'bckineta', ssh_bkginc, 1 )
	492	! Apply the masks
	493	ssh_bkginc(:,:) = ssh_bkginc(:,:) * tmask(:,:,1)
	494	! Set missing increments to 0.0 rather than 1e+20
	495	! to allow for differences in masks
	496	WHERE( ABS( ssh_bkginc(:,:) ) > 1.0e+10 ) ssh_bkginc(:,:) = 0.0
	497	ENDIF
	498
[3764]	499	IF ( ln_seaiceinc ) THEN
	500	CALL iom_get( inum, jpdom_autoglo, 'bckinseaice', seaice_bkginc, 1 )
	501	! Apply the masks
	502	seaice_bkginc(:,:) = seaice_bkginc(:,:) * tmask(:,:,1)
	503	! Set missing increments to 0.0 rather than 1e+20
	504	! to allow for differences in masks
	505	WHERE( ABS( seaice_bkginc(:,:) ) > 1.0e+10 ) seaice_bkginc(:,:) = 0.0
	506	ENDIF
	507
[8428]	508	IF ( ln_logchlinc ) THEN
	509	CALL iom_get( inum, jpdom_autoglo, 'bckinlogchl', logchl_bkginc(:,:), 1 )
	510	! Apply the masks
	511	logchl_bkginc(:,:) = logchl_bkginc(:,:) * tmask(:,:,1)
	512	! Set missing increments to 0.0 rather than 1e+20
	513	! to allow for differences in masks
	514	WHERE( ABS( logchl_bkginc(:,:) ) > 1.0e+10 ) logchl_bkginc(:,:) = 0.0
	515	ENDIF
	516
[2128]	517	CALL iom_close( inum )
	518
	519	ENDIF
	520
	521	!-----------------------------------------------------------------------
[3294]	522	! Apply divergence damping filter
	523	!-----------------------------------------------------------------------
	524
	525	IF ( ln_dyninc .AND. nn_divdmp > 0 ) THEN
	526
[3764]	527	CALL wrk_alloc(jpi,jpj,hdiv)
[3294]	528
[3764]	529	DO jt = 1, nn_divdmp
[3294]	530
[3764]	531	DO jk = 1, jpkm1
[3294]	532
[3764]	533	hdiv(:,:) = 0._wp
[3294]	534
[3764]	535	DO jj = 2, jpjm1
	536	DO ji = fs_2, fs_jpim1 ! vector opt.
	537	hdiv(ji,jj) = &
	538	( e2u(ji ,jj ) * fse3u(ji ,jj ,jk) * u_bkginc(ji ,jj ,jk) &
	539	- e2u(ji-1,jj ) * fse3u(ji-1,jj ,jk) * u_bkginc(ji-1,jj ,jk) &
	540	+ e1v(ji ,jj ) * fse3v(ji ,jj ,jk) * v_bkginc(ji ,jj ,jk) &
	541	- e1v(ji ,jj-1) * fse3v(ji ,jj-1,jk) * v_bkginc(ji ,jj-1,jk) ) &
	542	/ ( e1t(ji,jj) * e2t(ji,jj) * fse3t(ji,jj,jk) )
	543	END DO
[3294]	544	END DO
	545
[3764]	546	CALL lbc_lnk( hdiv, 'T', 1. ) ! lateral boundary cond. (no sign change)
[3294]	547
[3764]	548	DO jj = 2, jpjm1
	549	DO ji = fs_2, fs_jpim1 ! vector opt.
	550	u_bkginc(ji,jj,jk) = u_bkginc(ji,jj,jk) + 0.2_wp * ( e1t(ji+1,jj)e2t(ji+1,jj) hdiv(ji+1,jj) &
	551	- e1t(ji ,jj)e2t(ji ,jj) hdiv(ji ,jj) ) &
	552	/ e1u(ji,jj) * umask(ji,jj,jk)
	553	v_bkginc(ji,jj,jk) = v_bkginc(ji,jj,jk) + 0.2_wp * ( e1t(ji,jj+1)e2t(ji,jj+1) hdiv(ji,jj+1) &
	554	- e1t(ji,jj )e2t(ji,jj ) hdiv(ji,jj ) ) &
	555	/ e2v(ji,jj) * vmask(ji,jj,jk)
	556	END DO
[3294]	557	END DO
[3764]	558
[3294]	559	END DO
	560
[3764]	561	END DO
[3294]	562
[3764]	563	CALL wrk_dealloc(jpi,jpj,hdiv)
[3294]	564
	565	ENDIF
	566
	567
	568
	569	!-----------------------------------------------------------------------
[2128]	570	! Allocate and initialize the background state arrays
	571	!-----------------------------------------------------------------------
	572
	573	IF ( ln_asmdin ) THEN
	574
	575	ALLOCATE( t_bkg(jpi,jpj,jpk) )
	576	ALLOCATE( s_bkg(jpi,jpj,jpk) )
	577	ALLOCATE( u_bkg(jpi,jpj,jpk) )
	578	ALLOCATE( v_bkg(jpi,jpj,jpk) )
	579	ALLOCATE( ssh_bkg(jpi,jpj) )
	580
	581	t_bkg(:,:,:) = 0.0
	582	s_bkg(:,:,:) = 0.0
	583	u_bkg(:,:,:) = 0.0
	584	v_bkg(:,:,:) = 0.0
	585	ssh_bkg(:,:) = 0.0
	586
	587	!--------------------------------------------------------------------
	588	! Read from file the background state at analysis time
	589	!--------------------------------------------------------------------
	590
	591	CALL iom_open( c_asmdin, inum )
	592
[3764]	593	CALL iom_get( inum, 'rdastp', zdate_bkg )
[2128]	594
	595	IF(lwp) THEN
	596	WRITE(numout,*)
	597	WRITE(numout,*) 'asm_inc_init : Assimilation background state valid at : ', &
	598	& NINT( zdate_bkg )
	599	WRITE(numout,*) '~~~~~~~~~~~~'
	600	ENDIF
	601
	602	IF ( NINT( zdate_bkg ) /= iitdin_date ) &
	603	& CALL ctl_warn( ' Validity time of assimilation background state does', &
	604	& ' not agree with Direct Initialization time' )
	605
	606	IF ( ln_trainc ) THEN
	607	CALL iom_get( inum, jpdom_autoglo, 'tn', t_bkg )
	608	CALL iom_get( inum, jpdom_autoglo, 'sn', s_bkg )
	609	t_bkg(:,:,:) = t_bkg(:,:,:) * tmask(:,:,:)
	610	s_bkg(:,:,:) = s_bkg(:,:,:) * tmask(:,:,:)
	611	ENDIF
	612
	613	IF ( ln_dyninc ) THEN
	614	CALL iom_get( inum, jpdom_autoglo, 'un', u_bkg )
	615	CALL iom_get( inum, jpdom_autoglo, 'vn', v_bkg )
	616	u_bkg(:,:,:) = u_bkg(:,:,:) * umask(:,:,:)
	617	v_bkg(:,:,:) = v_bkg(:,:,:) * vmask(:,:,:)
	618	ENDIF
	619
	620	IF ( ln_sshinc ) THEN
	621	CALL iom_get( inum, jpdom_autoglo, 'sshn', ssh_bkg )
	622	ssh_bkg(:,:) = ssh_bkg(:,:) * tmask(:,:,1)
	623	ENDIF
	624
	625	CALL iom_close( inum )
	626
	627	ENDIF
[8436]	628
	629	#if defined key_hadocc \|\| (defined key_medusa && defined key_foam_medusa)
	630	IF ( ln_logchlinc ) THEN
	631
	632	ALLOCATE( pgrow_avg_bkg(jpi,jpj) )
	633	ALLOCATE( ploss_avg_bkg(jpi,jpj) )
	634	ALLOCATE( phyt_avg_bkg(jpi,jpj) )
	635	ALLOCATE( mld_max_bkg(jpi,jpj) )
	636	pgrow_avg_bkg(:,:) = 0.0
	637	ploss_avg_bkg(:,:) = 0.0
	638	phyt_avg_bkg(:,:) = 0.0
	639	mld_max_bkg(:,:) = 0.0
	640
	641	IF ( ln_logchlbal ) THEN
	642
	643	!--------------------------------------------------------------------
	644	! Read background variables for logchl balancing
	645	!--------------------------------------------------------------------
	646
	647	CALL iom_open( c_asmbkg, inum )
	648
	649	CALL iom_get( inum, jpdom_autoglo, 'pgrow_avg', pgrow_avg_bkg )
	650	CALL iom_get( inum, jpdom_autoglo, 'ploss_avg', ploss_avg_bkg )
	651	CALL iom_get( inum, jpdom_autoglo, 'phyt_avg', phyt_avg_bkg )
	652	CALL iom_get( inum, jpdom_autoglo, 'mld_max', mld_max_bkg )
	653	pgrow_avg_bkg(:,:) = pgrow_avg_bkg(:,:) * tmask(:,:,1)
	654	ploss_avg_bkg(:,:) = ploss_avg_bkg(:,:) * tmask(:,:,1)
	655	phyt_avg_bkg(:,:) = phyt_avg_bkg(:,:) * tmask(:,:,1)
	656	mld_max_bkg(:,:) = mld_max_bkg(:,:) * tmask(:,:,1)
	657
	658	CALL iom_close( inum )
	659
	660	ENDIF
	661
	662	ENDIF
	663	#endif
[2392]	664	!
[2128]	665	END SUBROUTINE asm_inc_init
	666
[2392]	667
[2128]	668	SUBROUTINE calc_date( kit000, kt, kdate0, kdate )
	669	!!----------------------------------------------------------------------
	670	!! * ROUTINE calc_date *
	671	!!
	672	!! ** Purpose : Compute the calendar date YYYYMMDD at a given time step.
	673	!!
	674	!! ** Method : Compute the calendar date YYYYMMDD at a given time step.
	675	!!
	676	!! ** Action :
	677	!!----------------------------------------------------------------------
	678	INTEGER, INTENT(IN) :: kit000 ! Initial time step
	679	INTEGER, INTENT(IN) :: kt ! Current time step referenced to kit000
	680	INTEGER, INTENT(IN) :: kdate0 ! Initial date
	681	INTEGER, INTENT(OUT) :: kdate ! Current date reference to kdate0
[2392]	682	!
[2128]	683	INTEGER :: iyea0 ! Initial year
	684	INTEGER :: imon0 ! Initial month
	685	INTEGER :: iday0 ! Initial day
	686	INTEGER :: iyea ! Current year
	687	INTEGER :: imon ! Current month
	688	INTEGER :: iday ! Current day
	689	INTEGER :: idaystp ! Number of days between initial and current date
	690	INTEGER :: idaycnt ! Day counter
	691
	692	INTEGER, DIMENSION(12) :: imonth_len !: length in days of the months of the current year
	693
	694	!-----------------------------------------------------------------------
	695	! Compute the calendar date YYYYMMDD
	696	!-----------------------------------------------------------------------
	697
	698	! Initial date
	699	iyea0 = kdate0 / 10000
	700	imon0 = ( kdate0 - ( iyea0 * 10000 ) ) / 100
	701	iday0 = kdate0 - ( iyea0 * 10000 ) - ( imon0 * 100 )
	702
	703	! Check that kt >= kit000 - 1
	704	IF ( kt < kit000 - 1 ) CALL ctl_stop( ' kt must be >= kit000 - 1')
	705
	706	! If kt = kit000 - 1 then set the date to the restart date
	707	IF ( kt == kit000 - 1 ) THEN
	708
	709	kdate = ndastp
	710	RETURN
	711
	712	ENDIF
	713
	714	! Compute the number of days from the initial date
	715	idaystp = INT( REAL( kt - kit000 ) * rdt / 86400. )
	716
	717	iday = iday0
	718	imon = imon0
	719	iyea = iyea0
	720	idaycnt = 0
	721
	722	CALL calc_month_len( iyea, imonth_len )
	723
	724	DO WHILE ( idaycnt < idaystp )
	725	iday = iday + 1
	726	IF ( iday > imonth_len(imon) ) THEN
	727	iday = 1
	728	imon = imon + 1
	729	ENDIF
	730	IF ( imon > 12 ) THEN
	731	imon = 1
	732	iyea = iyea + 1
	733	CALL calc_month_len( iyea, imonth_len ) ! update month lengths
	734	ENDIF
	735	idaycnt = idaycnt + 1
	736	END DO
[2392]	737	!
[2128]	738	kdate = iyea * 10000 + imon * 100 + iday
[2392]	739	!
[2128]	740	END SUBROUTINE
	741
[2392]	742
[2128]	743	SUBROUTINE calc_month_len( iyear, imonth_len )
	744	!!----------------------------------------------------------------------
	745	!! * ROUTINE calc_month_len *
	746	!!
	747	!! ** Purpose : Compute the number of days in a months given a year.
	748	!!
	749	!! ** Method :
	750	!!----------------------------------------------------------------------
	751	INTEGER, DIMENSION(12) :: imonth_len !: length in days of the months of the current year
	752	INTEGER :: iyear !: year
[2392]	753	!!----------------------------------------------------------------------
	754	!
[2128]	755	! length of the month of the current year (from nleapy, read in namelist)
	756	IF ( nleapy < 2 ) THEN
	757	imonth_len(:) = (/ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 /)
	758	IF ( nleapy == 1 ) THEN ! we are using calendar with leap years
	759	IF ( MOD(iyear, 4) == 0 .AND. ( MOD(iyear, 400) == 0 .OR. MOD(iyear, 100) /= 0 ) ) THEN
	760	imonth_len(2) = 29
	761	ENDIF
	762	ENDIF
	763	ELSE
	764	imonth_len(:) = nleapy ! all months with nleapy days per year
	765	ENDIF
[2392]	766	!
[2128]	767	END SUBROUTINE
	768
[2392]	769
[2128]	770	SUBROUTINE tra_asm_inc( kt )
	771	!!----------------------------------------------------------------------
	772	!! * ROUTINE tra_asm_inc *
	773	!!
	774	!! ** Purpose : Apply the tracer (T and S) assimilation increments
	775	!!
	776	!! ** Method : Direct initialization or Incremental Analysis Updating
	777	!!
	778	!! ** Action :
	779	!!----------------------------------------------------------------------
	780	INTEGER, INTENT(IN) :: kt ! Current time step
[2392]	781	!
[2128]	782	INTEGER :: ji,jj,jk
	783	INTEGER :: it
	784	REAL(wp) :: zincwgt ! IAU weight for current time step
[3764]	785	REAL (wp), DIMENSION(jpi,jpj,jpk) :: fzptnz ! 3d freezing point values
[2392]	786	!!----------------------------------------------------------------------
[2128]	787
[3764]	788	! freezing point calculation taken from oc_fz_pt (but calculated for all depths)
	789	! used to prevent the applied increments taking the temperature below the local freezing point
	790
[4990]	791	DO jk = 1, jpkm1
[6498]	792	CALL eos_fzp( tsn(:,:,jk,jp_sal), fzptnz(:,:,jk), fsdept(:,:,jk) )
[4990]	793	END DO
[3764]	794
[2128]	795	IF ( ln_asmiau ) THEN
	796
	797	!--------------------------------------------------------------------
	798	! Incremental Analysis Updating
	799	!--------------------------------------------------------------------
	800
	801	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	802
	803	it = kt - nit000 + 1
	804	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
	805
	806	IF(lwp) THEN
	807	WRITE(numout,*)
[4990]	808	WRITE(numout,*) 'tra_asm_inc : Tracer IAU at time step = ', kt,' with IAU weight = ', wgtiau(it)
[2128]	809	WRITE(numout,*) '~~~~~~~~~~~~'
	810	ENDIF
	811
	812	! Update the tracer tendencies
	813	DO jk = 1, jpkm1
[3764]	814	IF (ln_temnofreeze) THEN
	815	! Do not apply negative increments if the temperature will fall below freezing
	816	WHERE(t_bkginc(:,:,jk) > 0.0_wp .OR. &
	817	& tsn(:,:,jk,jp_tem) + tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * wgtiau(it) > fzptnz(:,:,jk) )
	818	tsa(:,:,jk,jp_tem) = tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * zincwgt
	819	END WHERE
	820	ELSE
	821	tsa(:,:,jk,jp_tem) = tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * zincwgt
	822	ENDIF
	823	IF (ln_salfix) THEN
	824	! Do not apply negative increments if the salinity will fall below a specified
	825	! minimum value salfixmin
	826	WHERE(s_bkginc(:,:,jk) > 0.0_wp .OR. &
	827	& tsn(:,:,jk,jp_sal) + tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * wgtiau(it) > salfixmin )
	828	tsa(:,:,jk,jp_sal) = tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * zincwgt
	829	END WHERE
	830	ELSE
	831	tsa(:,:,jk,jp_sal) = tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * zincwgt
	832	ENDIF
[2128]	833	END DO
	834
	835	ENDIF
	836
	837	IF ( kt == nitiaufin_r + 1 ) THEN ! For bias crcn to work
	838	DEALLOCATE( t_bkginc )
	839	DEALLOCATE( s_bkginc )
	840	ENDIF
	841
	842
	843	ELSEIF ( ln_asmdin ) THEN
	844
	845	!--------------------------------------------------------------------
	846	! Direct Initialization
	847	!--------------------------------------------------------------------
	848
	849	IF ( kt == nitdin_r ) THEN
	850
	851	neuler = 0 ! Force Euler forward step
	852
	853	! Initialize the now fields with the background + increment
[3764]	854	IF (ln_temnofreeze) THEN
	855	! Do not apply negative increments if the temperature will fall below freezing
[4990]	856	WHERE( t_bkginc(:,:,:) > 0.0_wp .OR. tsn(:,:,:,jp_tem) + t_bkginc(:,:,:) > fzptnz(:,:,:) )
[3764]	857	tsn(:,:,:,jp_tem) = t_bkg(:,:,:) + t_bkginc(:,:,:)
	858	END WHERE
	859	ELSE
	860	tsn(:,:,:,jp_tem) = t_bkg(:,:,:) + t_bkginc(:,:,:)
	861	ENDIF
[2128]	862	IF (ln_salfix) THEN
[3764]	863	! Do not apply negative increments if the salinity will fall below a specified
	864	! minimum value salfixmin
[4990]	865	WHERE( s_bkginc(:,:,:) > 0.0_wp .OR. tsn(:,:,:,jp_sal) + s_bkginc(:,:,:) > salfixmin )
[3764]	866	tsn(:,:,:,jp_sal) = s_bkg(:,:,:) + s_bkginc(:,:,:)
	867	END WHERE
	868	ELSE
	869	tsn(:,:,:,jp_sal) = s_bkg(:,:,:) + s_bkginc(:,:,:)
[2128]	870	ENDIF
	871
[4990]	872	tsb(:,:,:,:) = tsn(:,:,:,:) ! Update before fields
[2128]	873
[4990]	874	CALL eos( tsb, rhd, rhop, gdept_0(:,:,:) ) ! Before potential and in situ densities
	875	!!gm fabien
	876	! CALL eos( tsb, rhd, rhop ) ! Before potential and in situ densities
	877	!!gm
	878
	879
[5120]	880	IF( ln_zps .AND. .NOT. lk_c1d .AND. .NOT. ln_isfcav) &
	881	& CALL zps_hde ( kt, jpts, tsb, gtsu, gtsv, & ! Partial steps: before horizontal gradient
	882	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
	883	IF( ln_zps .AND. .NOT. lk_c1d .AND. ln_isfcav) &
	884	& CALL zps_hde_isf( nit000, jpts, tsb, gtsu, gtsv, & ! Partial steps for top cell (ISF)
	885	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
	886	& gtui, gtvi, grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi ) ! of t, s, rd at the last ocean level
[2128]	887
[3764]	888	#if defined key_zdfkpp
[4313]	889	CALL eos( tsn, rhd, fsdept_n(:,:,:) ) ! Compute rhd
[4990]	890	!!gm fabien CALL eos( tsn, rhd ) ! Compute rhd
[3764]	891	#endif
	892
[2128]	893	DEALLOCATE( t_bkginc )
	894	DEALLOCATE( s_bkginc )
	895	DEALLOCATE( t_bkg )
	896	DEALLOCATE( s_bkg )
	897	ENDIF
[2392]	898	!
[2128]	899	ENDIF
[7962]	900	! Perhaps the following call should be in step
	901	IF ( ln_seaiceinc ) CALL seaice_asm_inc ( kt ) ! apply sea ice concentration increment
[2392]	902	!
[2128]	903	END SUBROUTINE tra_asm_inc
	904
[2392]	905
[2128]	906	SUBROUTINE dyn_asm_inc( kt )
	907	!!----------------------------------------------------------------------
	908	!! * ROUTINE dyn_asm_inc *
	909	!!
	910	!! ** Purpose : Apply the dynamics (u and v) assimilation increments.
	911	!!
	912	!! ** Method : Direct initialization or Incremental Analysis Updating.
	913	!!
	914	!! ** Action :
	915	!!----------------------------------------------------------------------
	916	INTEGER, INTENT(IN) :: kt ! Current time step
[2392]	917	!
[2128]	918	INTEGER :: jk
	919	INTEGER :: it
	920	REAL(wp) :: zincwgt ! IAU weight for current time step
[2392]	921	!!----------------------------------------------------------------------
[2128]	922
	923	IF ( ln_asmiau ) THEN
	924
	925	!--------------------------------------------------------------------
	926	! Incremental Analysis Updating
	927	!--------------------------------------------------------------------
	928
	929	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	930
	931	it = kt - nit000 + 1
	932	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
	933
	934	IF(lwp) THEN
	935	WRITE(numout,*)
	936	WRITE(numout,*) 'dyn_asm_inc : Dynamics IAU at time step = ', &
	937	& kt,' with IAU weight = ', wgtiau(it)
	938	WRITE(numout,*) '~~~~~~~~~~~~'
	939	ENDIF
	940
	941	! Update the dynamic tendencies
	942	DO jk = 1, jpkm1
	943	ua(:,:,jk) = ua(:,:,jk) + u_bkginc(:,:,jk) * zincwgt
	944	va(:,:,jk) = va(:,:,jk) + v_bkginc(:,:,jk) * zincwgt
	945	END DO
	946
	947	IF ( kt == nitiaufin_r ) THEN
	948	DEALLOCATE( u_bkginc )
	949	DEALLOCATE( v_bkginc )
	950	ENDIF
	951
	952	ENDIF
	953
	954	ELSEIF ( ln_asmdin ) THEN
	955
	956	!--------------------------------------------------------------------
	957	! Direct Initialization
	958	!--------------------------------------------------------------------
	959
	960	IF ( kt == nitdin_r ) THEN
	961
	962	neuler = 0 ! Force Euler forward step
	963
	964	! Initialize the now fields with the background + increment
	965	un(:,:,:) = u_bkg(:,:,:) + u_bkginc(:,:,:)
	966	vn(:,:,:) = v_bkg(:,:,:) + v_bkginc(:,:,:)
	967
	968	ub(:,:,:) = un(:,:,:) ! Update before fields
	969	vb(:,:,:) = vn(:,:,:)
	970
	971	DEALLOCATE( u_bkg )
	972	DEALLOCATE( v_bkg )
	973	DEALLOCATE( u_bkginc )
	974	DEALLOCATE( v_bkginc )
	975	ENDIF
[2392]	976	!
[2128]	977	ENDIF
[2392]	978	!
[2128]	979	END SUBROUTINE dyn_asm_inc
	980
[2392]	981
[2128]	982	SUBROUTINE ssh_asm_inc( kt )
	983	!!----------------------------------------------------------------------
	984	!! * ROUTINE ssh_asm_inc *
	985	!!
	986	!! ** Purpose : Apply the sea surface height assimilation increment.
	987	!!
	988	!! ** Method : Direct initialization or Incremental Analysis Updating.
	989	!!
	990	!! ** Action :
	991	!!----------------------------------------------------------------------
	992	INTEGER, INTENT(IN) :: kt ! Current time step
[2392]	993	!
[2128]	994	INTEGER :: it
[3764]	995	INTEGER :: jk
[2128]	996	REAL(wp) :: zincwgt ! IAU weight for current time step
[2392]	997	!!----------------------------------------------------------------------
[2128]	998
	999	IF ( ln_asmiau ) THEN
	1000
	1001	!--------------------------------------------------------------------
	1002	! Incremental Analysis Updating
	1003	!--------------------------------------------------------------------
	1004
	1005	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	1006
	1007	it = kt - nit000 + 1
	1008	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
	1009
	1010	IF(lwp) THEN
	1011	WRITE(numout,*)
	1012	WRITE(numout,*) 'ssh_asm_inc : SSH IAU at time step = ', &
	1013	& kt,' with IAU weight = ', wgtiau(it)
	1014	WRITE(numout,*) '~~~~~~~~~~~~'
	1015	ENDIF
	1016
	1017	! Save the tendency associated with the IAU weighted SSH increment
	1018	! (applied in dynspg.*)
	1019	#if defined key_asminc
	1020	ssh_iau(:,:) = ssh_bkginc(:,:) * zincwgt
	1021	#endif
	1022	IF ( kt == nitiaufin_r ) THEN
	1023	DEALLOCATE( ssh_bkginc )
	1024	ENDIF
	1025
[8400]	1026	ELSE
	1027	#if defined key_asminc
	1028	ssh_iau(:,:) = 0.0
	1029	#endif
[2128]	1030	ENDIF
	1031
	1032	ELSEIF ( ln_asmdin ) THEN
	1033
	1034	!--------------------------------------------------------------------
	1035	! Direct Initialization
	1036	!--------------------------------------------------------------------
	1037
	1038	IF ( kt == nitdin_r ) THEN
	1039
	1040	neuler = 0 ! Force Euler forward step
	1041
	1042	! Initialize the now fields the background + increment
	1043	sshn(:,:) = ssh_bkg(:,:) + ssh_bkginc(:,:)
	1044
[3764]	1045	! Update before fields
	1046	sshb(:,:) = sshn(:,:)
[2128]	1047
[3764]	1048	IF( lk_vvl ) THEN
	1049	DO jk = 1, jpk
	1050	fse3t_b(:,:,jk) = fse3t_n(:,:,jk)
	1051	END DO
	1052	ENDIF
	1053
[2128]	1054	DEALLOCATE( ssh_bkg )
	1055	DEALLOCATE( ssh_bkginc )
	1056
	1057	ENDIF
[2392]	1058	!
[2128]	1059	ENDIF
[2392]	1060	!
[2128]	1061	END SUBROUTINE ssh_asm_inc
	1062
[3785]	1063
[3764]	1064	SUBROUTINE seaice_asm_inc( kt, kindic )
	1065	!!----------------------------------------------------------------------
	1066	!! * ROUTINE seaice_asm_inc *
	1067	!!
	1068	!! ** Purpose : Apply the sea ice assimilation increment.
	1069	!!
	1070	!! ** Method : Direct initialization or Incremental Analysis Updating.
	1071	!!
	1072	!! ** Action :
	1073	!!
	1074	!!----------------------------------------------------------------------
	1075	IMPLICIT NONE
[3785]	1076	!
	1077	INTEGER, INTENT(in) :: kt ! Current time step
	1078	INTEGER, INTENT(in), OPTIONAL :: kindic ! flag for disabling the deallocation
	1079	!
	1080	INTEGER :: it
	1081	REAL(wp) :: zincwgt ! IAU weight for current time step
	1082	#if defined key_lim2
	1083	REAL(wp), DIMENSION(jpi,jpj) :: zofrld, zohicif, zseaicendg, zhicifinc ! LIM
	1084	REAL(wp) :: zhicifmin = 0.5_wp ! ice minimum depth in metres
[3764]	1085	#endif
[3785]	1086	!!----------------------------------------------------------------------
[3764]	1087
	1088	IF ( ln_asmiau ) THEN
	1089
	1090	!--------------------------------------------------------------------
	1091	! Incremental Analysis Updating
	1092	!--------------------------------------------------------------------
	1093
	1094	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	1095
	1096	it = kt - nit000 + 1
	1097	zincwgt = wgtiau(it) ! IAU weight for the current time step
	1098	! note this is not a tendency so should not be divided by rdt (as with the tracer and other increments)
	1099
	1100	IF(lwp) THEN
	1101	WRITE(numout,*)
	1102	WRITE(numout,*) 'seaice_asm_inc : sea ice conc IAU at time step = ', &
	1103	& kt,' with IAU weight = ', wgtiau(it)
	1104	WRITE(numout,*) '~~~~~~~~~~~~'
	1105	ENDIF
	1106
[3785]	1107	! Sea-ice : LIM-3 case (to add)
[3764]	1108
[3785]	1109	#if defined key_lim2
	1110	! Sea-ice : LIM-2 case
	1111	zofrld (:,:) = frld(:,:)
	1112	zohicif(:,:) = hicif(:,:)
	1113	!
	1114	frld = MIN( MAX( frld (:,:) - seaice_bkginc(:,:) * zincwgt, 0.0_wp), 1.0_wp)
[3764]	1115	pfrld = MIN( MAX( pfrld(:,:) - seaice_bkginc(:,:) * zincwgt, 0.0_wp), 1.0_wp)
	1116	fr_i(:,:) = 1.0_wp - frld(:,:) ! adjust ice fraction
[3785]	1117	!
	1118	zseaicendg(:,:) = zofrld(:,:) - frld(:,:) ! find out actual sea ice nudge applied
	1119	!
[3764]	1120	! Nudge sea ice depth to bring it up to a required minimum depth
	1121	WHERE( zseaicendg(:,:) > 0.0_wp .AND. hicif(:,:) < zhicifmin )
	1122	zhicifinc(:,:) = (zhicifmin - hicif(:,:)) * zincwgt
	1123	ELSEWHERE
	1124	zhicifinc(:,:) = 0.0_wp
	1125	END WHERE
[3785]	1126	!
	1127	! nudge ice depth
	1128	hicif (:,:) = hicif (:,:) + zhicifinc(:,:)
	1129	phicif(:,:) = phicif(:,:) + zhicifinc(:,:)
	1130	!
	1131	! seaice salinity balancing (to add)
[3764]	1132	#endif
	1133
[4245]	1134	#if defined key_cice && defined key_asminc
[3785]	1135	! Sea-ice : CICE case. Pass ice increment tendency into CICE
[3764]	1136	ndaice_da(:,:) = seaice_bkginc(:,:) * zincwgt / rdt
	1137	#endif
	1138
	1139	IF ( kt == nitiaufin_r ) THEN
	1140	DEALLOCATE( seaice_bkginc )
	1141	ENDIF
	1142
	1143	ELSE
	1144
[4245]	1145	#if defined key_cice && defined key_asminc
[3785]	1146	! Sea-ice : CICE case. Zero ice increment tendency into CICE
[3764]	1147	ndaice_da(:,:) = 0.0_wp
	1148	#endif
	1149
	1150	ENDIF
	1151
	1152	ELSEIF ( ln_asmdin ) THEN
	1153
	1154	!--------------------------------------------------------------------
	1155	! Direct Initialization
	1156	!--------------------------------------------------------------------
	1157
	1158	IF ( kt == nitdin_r ) THEN
	1159
	1160	neuler = 0 ! Force Euler forward step
	1161
[3785]	1162	! Sea-ice : LIM-3 case (to add)
[3764]	1163
[3785]	1164	#if defined key_lim2
	1165	! Sea-ice : LIM-2 case.
[3764]	1166	zofrld(:,:)=frld(:,:)
	1167	zohicif(:,:)=hicif(:,:)
[3785]	1168	!
[3764]	1169	! Initialize the now fields the background + increment
[3785]	1170	frld (:,:) = MIN( MAX( frld(:,:) - seaice_bkginc(:,:), 0.0_wp), 1.0_wp)
[3764]	1171	pfrld(:,:) = frld(:,:)
[3785]	1172	fr_i (:,:) = 1.0_wp - frld(:,:) ! adjust ice fraction
	1173	zseaicendg(:,:) = zofrld(:,:) - frld(:,:) ! find out actual sea ice nudge applied
	1174	!
[3764]	1175	! Nudge sea ice depth to bring it up to a required minimum depth
	1176	WHERE( zseaicendg(:,:) > 0.0_wp .AND. hicif(:,:) < zhicifmin )
	1177	zhicifinc(:,:) = (zhicifmin - hicif(:,:)) * zincwgt
	1178	ELSEWHERE
	1179	zhicifinc(:,:) = 0.0_wp
	1180	END WHERE
[3785]	1181	!
	1182	! nudge ice depth
	1183	hicif (:,:) = hicif (:,:) + zhicifinc(:,:)
	1184	phicif(:,:) = phicif(:,:)
	1185	!
	1186	! seaice salinity balancing (to add)
[3764]	1187	#endif
	1188
[4245]	1189	#if defined key_cice && defined key_asminc
	1190	! Sea-ice : CICE case. Pass ice increment tendency into CICE
[3764]	1191	ndaice_da(:,:) = seaice_bkginc(:,:) / rdt
	1192	#endif
	1193	IF ( .NOT. PRESENT(kindic) ) THEN
	1194	DEALLOCATE( seaice_bkginc )
	1195	END IF
	1196
	1197	ELSE
	1198
[4245]	1199	#if defined key_cice && defined key_asminc
[3785]	1200	! Sea-ice : CICE case. Zero ice increment tendency into CICE
[3764]	1201	ndaice_da(:,:) = 0.0_wp
	1202	#endif
	1203
	1204	ENDIF
	1205
[3785]	1206	!#if defined defined key_lim2 \|\| defined key_cice
[3764]	1207	!
	1208	! IF (ln_seaicebal ) THEN
	1209	! !! balancing salinity increments
	1210	! !! simple case from limflx.F90 (doesn't include a mass flux)
	1211	! !! assumption is that as ice concentration is reduced or increased
	1212	! !! the snow and ice depths remain constant
	1213	! !! note that snow is being created where ice concentration is being increased
	1214	! !! - could be more sophisticated and
	1215	! !! not do this (but would need to alter h_snow)
	1216	!
	1217	! usave(:,:,:)=sb(:,:,:) ! use array as a temporary store
	1218	!
	1219	! DO jj = 1, jpj
	1220	! DO ji = 1, jpi
	1221	! ! calculate change in ice and snow mass per unit area
	1222	! ! positive values imply adding salt to the ocean (results from ice formation)
	1223	! ! fwf : ice formation and melting
	1224	!
	1225	! zfons = ( -nfresh_da(ji,jj)soce + nfsalt_da(ji,jj) )rdt
	1226	!
	1227	! ! change salinity down to mixed layer depth
	1228	! mld=hmld_kara(ji,jj)
	1229	!
	1230	! ! prevent small mld
	1231	! ! less than 10m can cause salinity instability
	1232	! IF (mld < 10) mld=10
	1233	!
	1234	! ! set to bottom of a level
	1235	! DO jk = jpk-1, 2, -1
	1236	! IF ((mld > gdepw(ji,jj,jk)) .and. (mld < gdepw(ji,jj,jk+1))) THEN
	1237	! mld=gdepw(ji,jj,jk+1)
	1238	! jkmax=jk
	1239	! ENDIF
	1240	! ENDDO
	1241	!
	1242	! ! avoid applying salinity balancing in shallow water or on land
	1243	! !
	1244	!
	1245	! ! dsal_ocn (psu kg m^-2) / (kg m^-3 * m)
	1246	!
	1247	! dsal_ocn=0.0_wp
	1248	! sal_thresh=5.0_wp ! minimum salinity threshold for salinity balancing
	1249	!
	1250	! if (tmask(ji,jj,1) > 0 .AND. tmask(ji,jj,jkmax) > 0 ) &
	1251	! dsal_ocn = zfons / (rhop(ji,jj,1) * mld)
	1252	!
	1253	! ! put increments in for levels in the mixed layer
	1254	! ! but prevent salinity below a threshold value
	1255	!
	1256	! DO jk = 1, jkmax
	1257	!
	1258	! IF (dsal_ocn > 0.0_wp .or. sb(ji,jj,jk)+dsal_ocn > sal_thresh) THEN
	1259	! sb(ji,jj,jk) = sb(ji,jj,jk) + dsal_ocn
	1260	! sn(ji,jj,jk) = sn(ji,jj,jk) + dsal_ocn
	1261	! ENDIF
	1262	!
	1263	! ENDDO
	1264	!
	1265	! ! ! salt exchanges at the ice/ocean interface
	1266	! ! zpmess = zfons / rdt_ice ! rdt_ice is ice timestep
	1267	! !
	1268	! !! Adjust fsalt. A +ve fsalt means adding salt to ocean
	1269	! !! fsalt(ji,jj) = fsalt(ji,jj) + zpmess ! adjust fsalt
	1270	! !!
	1271	! !! emps(ji,jj) = emps(ji,jj) + zpmess ! or adjust emps (see icestp1d)
	1272	! !! ! E-P (kg m-2 s-2)
	1273	! ! emp(ji,jj) = emp(ji,jj) + zpmess ! E-P (kg m-2 s-2)
	1274	! ENDDO !ji
	1275	! ENDDO !jj!
	1276	!
	1277	! ENDIF !ln_seaicebal
	1278	!
	1279	!#endif
	1280
	1281	ENDIF
	1282
	1283	END SUBROUTINE seaice_asm_inc
[8428]	1284
	1285	SUBROUTINE logchl_asm_inc( kt )
	1286	!!----------------------------------------------------------------------
	1287	!! * ROUTINE logchl_asm_inc *
	1288	!!
	1289	!! ** Purpose : Apply the chlorophyll assimilation increments.
	1290	!!
	1291	!! ** Method : Calculate increments to state variables using nitrogen
	1292	!! balancing.
	1293	!! Direct initialization or Incremental Analysis Updating.
	1294	!!
	1295	!! ** Action :
	1296	!!----------------------------------------------------------------------
	1297	INTEGER, INTENT(IN) :: kt ! Current time step
	1298	!
	1299	INTEGER :: jk ! Loop counter
	1300	INTEGER :: it ! Index
	1301	REAL(wp) :: zincwgt ! IAU weight for current time step
	1302	REAL(wp) :: zincper ! IAU interval in seconds
	1303	!!----------------------------------------------------------------------
	1304
	1305	IF ( kt <= nit000 ) THEN
	1306
	1307	zincper = (nitiaufin_r - nitiaustr_r + 1) * rdt
	1308
	1309	#if defined key_medusa && defined key_foam_medusa
[8436]	1310	CALL asm_logchl_bal_medusa( logchl_bkginc, zincper, mld_choice_bgc, &
	1311	& rn_maxchlinc, ln_logchlbal, &
	1312	& pgrow_avg_bkg, ploss_avg_bkg, &
	1313	& phyt_avg_bkg, mld_max_bkg, &
	1314	& logchl_balinc )
[8428]	1315	#elif defined key_hadocc
	1316	CALL asm_logchl_bal_hadocc( logchl_bkginc, zincper, mld_choice_bgc, &
[8436]	1317	& rn_maxchlinc, ln_logchlbal, &
	1318	& pgrow_avg_bkg, ploss_avg_bkg, &
	1319	& phyt_avg_bkg, mld_max_bkg, &
	1320	& logchl_balinc )
[8428]	1321	#else
	1322	CALL ctl_stop( 'Attempting to assimilate logchl, ', &
	1323	& 'but not defined a biogeochemical model' )
	1324	#endif
	1325
	1326	ENDIF
	1327
	1328	IF ( ln_asmiau ) THEN
	1329
	1330	!--------------------------------------------------------------------
	1331	! Incremental Analysis Updating
	1332	!--------------------------------------------------------------------
	1333
	1334	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	1335
	1336	it = kt - nit000 + 1
	1337	zincwgt = wgtiau(it) ! IAU weight for the current time step
	1338	! note this is not a tendency so should not be divided by rdt
	1339
	1340	IF(lwp) THEN
	1341	WRITE(numout,*)
	1342	WRITE(numout,*) 'logchl_asm_inc : logchl IAU at time step = ', &
	1343	& kt,' with IAU weight = ', wgtiau(it)
	1344	WRITE(numout,*) '~~~~~~~~~~~~'
	1345	ENDIF
	1346
	1347	! Update the biogeochemical variables
	1348	! Add directly to trn and trb, rather than to tra, as not a tendency
	1349	#if defined key_medusa && defined key_foam_medusa
	1350	DO jk = 1, jpkm1
	1351	trn(:,:,jk,jp_msa0:jp_msa1) = trn(:,:,jk,jp_msa0:jp_msa1) + &
	1352	& logchl_balinc(:,:,jk,jp_msa0:jp_msa1) * zincwgt
	1353	trb(:,:,jk,jp_msa0:jp_msa1) = trb(:,:,jk,jp_msa0:jp_msa1) + &
	1354	& logchl_balinc(:,:,jk,jp_msa0:jp_msa1) * zincwgt
	1355	END DO
	1356	#elif defined key_hadocc
	1357	DO jk = 1, jpkm1
	1358	trn(:,:,jk,jp_had0:jp_had1) = trn(:,:,jk,jp_had0:jp_had1) + &
	1359	& logchl_balinc(:,:,jk,jp_had0:jp_had1) * zincwgt
	1360	trb(:,:,jk,jp_had0:jp_had1) = trb(:,:,jk,jp_had0:jp_had1) + &
	1361	& logchl_balinc(:,:,jk,jp_had0:jp_had1) * zincwgt
	1362	END DO
	1363	#endif
	1364
	1365	! Do not deallocate arrays - needed by asm_bal_wri
	1366	! which is called at end of model run
	1367	ENDIF
	1368
	1369	ELSEIF ( ln_asmdin ) THEN
	1370
	1371	!--------------------------------------------------------------------
	1372	! Direct Initialization
	1373	!--------------------------------------------------------------------
	1374
	1375	IF ( kt == nitdin_r ) THEN
	1376
	1377	neuler = 0 ! Force Euler forward step
	1378
	1379	#if defined key_medusa && defined key_foam_medusa
	1380	! Initialize the now fields with the background + increment
	1381	! Background currently is what the model is initialised with
	1382	CALL ctl_warn( ' Doing direct initialisation of MEDUSA with chlorophyll assimilation', &
	1383	& ' Background state is taken from model rather than background file' )
	1384	trn(:,:,:,jp_msa0:jp_msa1) = trn(:,:,:,jp_msa0:jp_msa1) + &
	1385	& logchl_balinc(:,:,:,jp_msa0:jp_msa1)
	1386	trb(:,:,:,jp_msa0:jp_msa1) = trn(:,:,:,jp_msa0:jp_msa1)
	1387	#elif defined key_hadocc
	1388	! Initialize the now fields with the background + increment
	1389	! Background currently is what the model is initialised with
	1390	CALL ctl_warn( ' Doing direct initialisation of HadOCC with chlorophyll assimilation', &
	1391	& ' Background state is taken from model rather than background file' )
	1392	trn(:,:,:,jp_had0:jp_had1) = trn(:,:,:,jp_had0:jp_had1) + &
	1393	& logchl_balinc(:,:,:,jp_had0:jp_had1)
	1394	trb(:,:,:,jp_had0:jp_had1) = trn(:,:,:,jp_had0:jp_had1)
	1395	#endif
	1396
	1397	! Do not deallocate arrays - needed by asm_bal_wri
	1398	! which is called at end of model run
	1399	ENDIF
	1400	!
	1401	ENDIF
	1402	!
	1403	END SUBROUTINE logchl_asm_inc
[3785]	1404
[2392]	1405	!!======================================================================
[2128]	1406	END MODULE asminc

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