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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 @ 8440

Last change on this file since 8440 was 8440, checked in by dford, 7 years ago
Add more variables to assimilation background, so it includes all required elements of the background state.
File size: 63.9 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)
[8440]	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	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: tracer_bkg !: Background tracer state variables
[8436]	134	#endif
[8440]	135	#if defined key_hadocc
	136	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: chl_bkg !: Background surface chlorophyll
	137	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: cchl_p_bkg !: Background surface carbon:chlorophyll
	138	#endif
[8428]	139	REAL(wp) :: rn_maxchlinc = -999.0 !: maximum absolute non-log chlorophyll increment from logchl assimilation
	140	!: <= 0 implies no maximum applied (switch turned off)
	141	!: > 0 implies maximum absolute chl increment capped at this value
	142
	143	INTEGER :: mld_choice_bgc = 5 !: choice of mld criteria to use for biogeochemistry assimilation
	144	!: 1) hmld - Turbocline/mixing depth [W points]
	145	!: 2) hmlp - Density criterion (0.01 kg/m^3 change from 10m) [W points]
	146	!: 3) hmld_kara - Kara MLD [Interpolated]
	147	!: 4) hmld_tref - Temperature criterion (0.2 K change from surface) [T points]
	148	!: 5) hmlpt - Density criterion (0.01 kg/m^3 change from 10m) [T points]
	149
[3294]	150	!! * Substitutions
	151	# include "domzgr_substitute.h90"
	152	# include "ldfdyn_substitute.h90"
	153	# include "vectopt_loop_substitute.h90"
[2287]	154	!!----------------------------------------------------------------------
	155	!! NEMO/OPA 3.3 , NEMO Consortium (2010)
	156	!! $Id$
[2392]	157	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[2287]	158	!!----------------------------------------------------------------------
[2128]	159	CONTAINS
	160
	161	SUBROUTINE asm_inc_init
	162	!!----------------------------------------------------------------------
	163	!! * ROUTINE asm_inc_init *
	164	!!
	165	!! ** Purpose : Initialize the assimilation increment and IAU weights.
	166	!!
	167	!! ** Method : Initialize the assimilation increment and IAU weights.
	168	!!
	169	!! ** Action :
	170	!!----------------------------------------------------------------------
[4990]	171	INTEGER :: ji, jj, jk, jt ! dummy loop indices
	172	INTEGER :: imid, inum ! local integers
	173	INTEGER :: ios ! Local integer output status for namelist read
[2128]	174	INTEGER :: iiauper ! Number of time steps in the IAU period
	175	INTEGER :: icycper ! Number of time steps in the cycle
	176	INTEGER :: iitend_date ! Date YYYYMMDD of final time step
	177	INTEGER :: iitbkg_date ! Date YYYYMMDD of background time step for Jb term
	178	INTEGER :: iitdin_date ! Date YYYYMMDD of background time step for DI
	179	INTEGER :: iitiaustr_date ! Date YYYYMMDD of IAU interval start time step
	180	INTEGER :: iitiaufin_date ! Date YYYYMMDD of IAU interval final time step
[4990]	181	!
[2128]	182	REAL(wp) :: znorm ! Normalization factor for IAU weights
[4990]	183	REAL(wp) :: ztotwgt ! Value of time-integrated IAU weights (should be equal to one)
[2128]	184	REAL(wp) :: z_inc_dateb ! Start date of interval on which increment is valid
	185	REAL(wp) :: z_inc_datef ! End date of interval on which increment is valid
	186	REAL(wp) :: zdate_bkg ! Date in background state file for DI
	187	REAL(wp) :: zdate_inc ! Time axis in increments file
[4990]	188	!
	189	REAL(wp), POINTER, DIMENSION(:,:) :: hdiv ! 2D workspace
[2392]	190	!!
[8428]	191	NAMELIST/nam_asminc/ ln_bkgwri, ln_balwri, &
[2392]	192	& ln_trainc, ln_dyninc, ln_sshinc, &
[8428]	193	& ln_logchlinc, ln_logchlbal, &
[2392]	194	& ln_asmdin, ln_asmiau, &
	195	& nitbkg, nitdin, nitiaustr, nitiaufin, niaufn, &
[8400]	196	& ln_salfix, salfixmin, nn_divdmp, &
[8428]	197	& ln_seaiceinc, ln_temnofreeze, &
	198	& mld_choice_bgc, rn_maxchlinc
[2392]	199	!!----------------------------------------------------------------------
[2128]	200
	201	!-----------------------------------------------------------------------
	202	! Read Namelist nam_asminc : assimilation increment interface
	203	!-----------------------------------------------------------------------
[3764]	204	ln_seaiceinc = .FALSE.
	205	ln_temnofreeze = .FALSE.
[2128]	206
[4147]	207	REWIND( numnam_ref ) ! Namelist nam_asminc in reference namelist : Assimilation increment
	208	READ ( numnam_ref, nam_asminc, IOSTAT = ios, ERR = 901)
	209	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nam_asminc in reference namelist', lwp )
[2128]	210
[4147]	211	REWIND( numnam_cfg ) ! Namelist nam_asminc in configuration namelist : Assimilation increment
	212	READ ( numnam_cfg, nam_asminc, IOSTAT = ios, ERR = 902 )
	213	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nam_asminc in configuration namelist', lwp )
[4624]	214	IF(lwm) WRITE ( numond, nam_asminc )
[4147]	215
[2128]	216	! Control print
	217	IF(lwp) THEN
	218	WRITE(numout,*)
	219	WRITE(numout,*) 'asm_inc_init : Assimilation increment initialization :'
	220	WRITE(numout,*) '~~~~~~~~~~~~'
[2392]	221	WRITE(numout,*) ' Namelist namasm : set assimilation increment parameters'
	222	WRITE(numout,*) ' Logical switch for writing out background state ln_bkgwri = ', ln_bkgwri
[8428]	223	WRITE(numout,*) ' Logical switch for writing out balancing increments ln_balwri = ', ln_balwri
[2392]	224	WRITE(numout,*) ' Logical switch for applying tracer increments ln_trainc = ', ln_trainc
	225	WRITE(numout,*) ' Logical switch for applying velocity increments ln_dyninc = ', ln_dyninc
	226	WRITE(numout,*) ' Logical switch for applying SSH increments ln_sshinc = ', ln_sshinc
	227	WRITE(numout,*) ' Logical switch for Direct Initialization (DI) ln_asmdin = ', ln_asmdin
[3764]	228	WRITE(numout,*) ' Logical switch for applying sea ice increments ln_seaiceinc = ', ln_seaiceinc
[8428]	229	WRITE(numout,*) ' Logical switch for applying logchl increments ln_logchlinc = ', ln_logchlinc
	230	WRITE(numout,*) ' Logical switch for logchl multivariate balancing ln_logchlbal = ', ln_logchlbal
[2392]	231	WRITE(numout,*) ' Logical switch for Incremental Analysis Updating (IAU) ln_asmiau = ', ln_asmiau
	232	WRITE(numout,*) ' Timestep of background in [0,nitend-nit000-1] nitbkg = ', nitbkg
	233	WRITE(numout,*) ' Timestep of background for DI in [0,nitend-nit000-1] nitdin = ', nitdin
	234	WRITE(numout,*) ' Timestep of start of IAU interval in [0,nitend-nit000-1] nitiaustr = ', nitiaustr
	235	WRITE(numout,*) ' Timestep of end of IAU interval in [0,nitend-nit000-1] nitiaufin = ', nitiaufin
	236	WRITE(numout,*) ' Type of IAU weighting function niaufn = ', niaufn
	237	WRITE(numout,*) ' Logical switch for ensuring that the sa > salfixmin ln_salfix = ', ln_salfix
	238	WRITE(numout,*) ' Minimum salinity after applying the increments salfixmin = ', salfixmin
[8428]	239	WRITE(numout,*) ' Choice of MLD for BGC assimilation mld_choice_bgc = ', mld_choice_bgc
	240	WRITE(numout,*) ' Maximum absolute chlorophyll increment (<=0 = off) rn_maxchlinc = ', rn_maxchlinc
[2128]	241	ENDIF
	242
	243	nitbkg_r = nitbkg + nit000 - 1 ! Background time referenced to nit000
	244	nitdin_r = nitdin + nit000 - 1 ! Background time for DI referenced to nit000
	245	nitiaustr_r = nitiaustr + nit000 - 1 ! Start of IAU interval referenced to nit000
	246	nitiaufin_r = nitiaufin + nit000 - 1 ! End of IAU interval referenced to nit000
	247
	248	iiauper = nitiaufin_r - nitiaustr_r + 1 ! IAU interval length
	249	icycper = nitend - nit000 + 1 ! Cycle interval length
	250
[4990]	251	CALL calc_date( nit000, nitend , ndate0, iitend_date ) ! Date of final time step
	252	CALL calc_date( nit000, nitbkg_r , ndate0, iitbkg_date ) ! Background time for Jb referenced to ndate0
	253	CALL calc_date( nit000, nitdin_r , ndate0, iitdin_date ) ! Background time for DI referenced to ndate0
	254	CALL calc_date( nit000, nitiaustr_r, ndate0, iitiaustr_date ) ! IAU start time referenced to ndate0
	255	CALL calc_date( nit000, nitiaufin_r, ndate0, iitiaufin_date ) ! IAU end time referenced to ndate0
	256	!
[2128]	257	IF(lwp) THEN
	258	WRITE(numout,*)
	259	WRITE(numout,*) ' Time steps referenced to current cycle:'
	260	WRITE(numout,*) ' iitrst = ', nit000 - 1
	261	WRITE(numout,*) ' nit000 = ', nit000
	262	WRITE(numout,*) ' nitend = ', nitend
	263	WRITE(numout,*) ' nitbkg_r = ', nitbkg_r
	264	WRITE(numout,*) ' nitdin_r = ', nitdin_r
	265	WRITE(numout,*) ' nitiaustr_r = ', nitiaustr_r
	266	WRITE(numout,*) ' nitiaufin_r = ', nitiaufin_r
	267	WRITE(numout,*)
	268	WRITE(numout,*) ' Dates referenced to current cycle:'
	269	WRITE(numout,*) ' ndastp = ', ndastp
	270	WRITE(numout,*) ' ndate0 = ', ndate0
	271	WRITE(numout,*) ' iitend_date = ', iitend_date
	272	WRITE(numout,*) ' iitbkg_date = ', iitbkg_date
	273	WRITE(numout,*) ' iitdin_date = ', iitdin_date
	274	WRITE(numout,*) ' iitiaustr_date = ', iitiaustr_date
	275	WRITE(numout,*) ' iitiaufin_date = ', iitiaufin_date
	276	ENDIF
	277
	278	IF ( nacc /= 0 ) &
	279	& CALL ctl_stop( ' nacc /= 0 and key_asminc :', &
	280	& ' Assimilation increments have only been implemented', &
	281	& ' for synchronous time stepping' )
	282
	283	IF ( ( ln_asmdin ).AND.( ln_asmiau ) ) &
	284	& CALL ctl_stop( ' ln_asmdin and ln_asmiau :', &
	285	& ' Choose Direct Initialization OR Incremental Analysis Updating')
	286
	287	IF ( ( ( .NOT. ln_asmdin ).AND.( .NOT. ln_asmiau ) ) &
[8428]	288	& .AND.( ( ln_trainc ).OR.( ln_dyninc ).OR.( ln_sshinc ).OR.( ln_seaiceinc ).OR. &
	289	& ( ln_logchlinc ) )) &
	290	& CALL ctl_stop( ' One or more of ln_trainc, ln_dyninc, ln_sshinc, ln_seaiceinc,', &
	291	& ' and ln_logchlinc is set to .true.', &
[2128]	292	& ' but ln_asmdin and ln_asmiau are both set to .false. :', &
	293	& ' Inconsistent options')
	294
	295	IF ( ( niaufn /= 0 ).AND.( niaufn /= 1 ) ) &
	296	& CALL ctl_stop( ' niaufn /= 0 or niaufn /=1 :', &
	297	& ' Type IAU weighting function is invalid')
	298
[3764]	299	IF ( ( .NOT. ln_trainc ).AND.( .NOT. ln_dyninc ).AND.( .NOT. ln_sshinc ).AND.( .NOT. ln_seaiceinc ) &
[8428]	300	& .AND.( .NOT. ln_logchlinc ) ) &
	301	& CALL ctl_warn( ' ln_trainc, ln_dyninc, ln_sshinc, ln_seaiceinc,', &
	302	& ' and ln_logchlinc are set to .false. :', &
[2128]	303	& ' The assimilation increments are not applied')
	304
	305	IF ( ( ln_asmiau ).AND.( nitiaustr == nitiaufin ) ) &
	306	& CALL ctl_stop( ' nitiaustr = nitiaufin :', &
	307	& ' IAU interval is of zero length')
	308
	309	IF ( ( ln_asmiau ).AND.( ( nitiaustr_r < nit000 ).OR.( nitiaufin_r > nitend ) ) ) &
	310	& CALL ctl_stop( ' nitiaustr or nitiaufin :', &
	311	& ' IAU starting or final time step is outside the cycle interval', &
	312	& ' Valid range nit000 to nitend')
	313
	314	IF ( ( nitbkg_r < nit000 - 1 ).OR.( nitbkg_r > nitend ) ) &
	315	& CALL ctl_stop( ' nitbkg :', &
	316	& ' Background time step is outside the cycle interval')
	317
	318	IF ( ( nitdin_r < nit000 - 1 ).OR.( nitdin_r > nitend ) ) &
	319	& CALL ctl_stop( ' nitdin :', &
	320	& ' Background time step for Direct Initialization is outside', &
	321	& ' the cycle interval')
	322
[8428]	323	IF ( ( ln_balwri ).AND.( .NOT. ( ln_logchlinc ) ) ) THEN
	324	CALL ctl_warn( ' Balancing increments are only calculated for logchl', &
	325	& ' Not assimilating logchl, so ln_balwri will be set to .false.')
	326	ln_balwri = .FALSE.
	327	ENDIF
	328
	329	IF ( ( ln_logchlbal ).AND.( .NOT. ( ln_logchlinc ) ) ) THEN
	330	CALL ctl_warn( ' Cannot calculate logchl balancing increments if not assimilating logchl', &
	331	& ' Not assimilating logchl, so ln_logchlbal will be set to .false.')
	332	ln_logchlbal = .FALSE.
	333	ENDIF
	334
[2128]	335	IF ( nstop > 0 ) RETURN ! if there are any errors then go no further
	336
	337	!--------------------------------------------------------------------
	338	! Initialize the Incremental Analysis Updating weighting function
	339	!--------------------------------------------------------------------
	340
	341	IF ( ln_asmiau ) THEN
	342
	343	ALLOCATE( wgtiau( icycper ) )
	344
	345	wgtiau(:) = 0.0
	346
	347	IF ( niaufn == 0 ) THEN
	348
	349	!---------------------------------------------------------
	350	! Constant IAU forcing
	351	!---------------------------------------------------------
	352
	353	DO jt = 1, iiauper
	354	wgtiau(jt+nitiaustr-1) = 1.0 / REAL( iiauper )
	355	END DO
	356
	357	ELSEIF ( niaufn == 1 ) THEN
	358
	359	!---------------------------------------------------------
	360	! Linear hat-like, centred in middle of IAU interval
	361	!---------------------------------------------------------
	362
	363	! Compute the normalization factor
	364	znorm = 0.0
	365	IF ( MOD( iiauper, 2 ) == 0 ) THEN ! Even number of time steps in IAU interval
	366	imid = iiauper / 2
	367	DO jt = 1, imid
	368	znorm = znorm + REAL( jt )
	369	END DO
	370	znorm = 2.0 * znorm
	371	ELSE ! Odd number of time steps in IAU interval
	372	imid = ( iiauper + 1 ) / 2
	373	DO jt = 1, imid - 1
	374	znorm = znorm + REAL( jt )
	375	END DO
	376	znorm = 2.0 * znorm + REAL( imid )
	377	ENDIF
	378	znorm = 1.0 / znorm
	379
	380	DO jt = 1, imid - 1
	381	wgtiau(jt+nitiaustr-1) = REAL( jt ) * znorm
	382	END DO
	383	DO jt = imid, iiauper
	384	wgtiau(jt+nitiaustr-1) = REAL( iiauper - jt + 1 ) * znorm
	385	END DO
	386
	387	ENDIF
	388
	389	! Test that the integral of the weights over the weighting interval equals 1
	390	IF(lwp) THEN
	391	WRITE(numout,*)
	392	WRITE(numout,*) 'asm_inc_init : IAU weights'
	393	WRITE(numout,*) '~~~~~~~~~~~~'
	394	WRITE(numout,*) ' time step IAU weight'
	395	WRITE(numout,*) ' ========= ====================='
	396	ztotwgt = 0.0
	397	DO jt = 1, icycper
	398	ztotwgt = ztotwgt + wgtiau(jt)
	399	WRITE(numout,*) ' ', jt, ' ', wgtiau(jt)
	400	END DO
	401	WRITE(numout,*) ' ==================================='
	402	WRITE(numout,*) ' Time-integrated weight = ', ztotwgt
	403	WRITE(numout,*) ' ==================================='
	404	ENDIF
	405
	406	ENDIF
	407
	408	!--------------------------------------------------------------------
	409	! Allocate and initialize the increment arrays
	410	!--------------------------------------------------------------------
	411
	412	ALLOCATE( t_bkginc(jpi,jpj,jpk) )
	413	ALLOCATE( s_bkginc(jpi,jpj,jpk) )
	414	ALLOCATE( u_bkginc(jpi,jpj,jpk) )
	415	ALLOCATE( v_bkginc(jpi,jpj,jpk) )
	416	ALLOCATE( ssh_bkginc(jpi,jpj) )
[3764]	417	ALLOCATE( seaice_bkginc(jpi,jpj))
[2128]	418	#if defined key_asminc
	419	ALLOCATE( ssh_iau(jpi,jpj) )
	420	#endif
	421	t_bkginc(:,:,:) = 0.0
	422	s_bkginc(:,:,:) = 0.0
	423	u_bkginc(:,:,:) = 0.0
	424	v_bkginc(:,:,:) = 0.0
	425	ssh_bkginc(:,:) = 0.0
[3764]	426	seaice_bkginc(:,:) = 0.0
[2128]	427	#if defined key_asminc
	428	ssh_iau(:,:) = 0.0
	429	#endif
[8428]	430	IF ( ln_logchlinc ) THEN
	431	ALLOCATE( logchl_bkginc(jpi,jpj) )
	432	logchl_bkginc(:,:) = 0.0
	433	#if defined key_top
	434	ALLOCATE( logchl_balinc(jpi,jpj,jpk,jptra) )
	435	logchl_balinc(:,:,:,:) = 0.0
	436	#endif
	437	ENDIF
	438	IF ( ( ln_trainc ).OR.( ln_dyninc ).OR.( ln_sshinc ).OR.( ln_seaiceinc ) &
	439	& .OR.( ln_logchlinc ) ) THEN
[2128]	440
	441	!--------------------------------------------------------------------
	442	! Read the increments from file
	443	!--------------------------------------------------------------------
	444
	445	CALL iom_open( c_asminc, inum )
	446
	447	CALL iom_get( inum, 'time', zdate_inc )
	448
	449	CALL iom_get( inum, 'z_inc_dateb', z_inc_dateb )
	450	CALL iom_get( inum, 'z_inc_datef', z_inc_datef )
	451	z_inc_dateb = zdate_inc
	452	z_inc_datef = zdate_inc
	453
	454	IF(lwp) THEN
	455	WRITE(numout,*)
	456	WRITE(numout,*) 'asm_inc_init : Assimilation increments valid ', &
	457	& ' between dates ', NINT( z_inc_dateb ),' and ', &
	458	& NINT( z_inc_datef )
	459	WRITE(numout,*) '~~~~~~~~~~~~'
	460	ENDIF
	461
	462	IF ( ( NINT( z_inc_dateb ) < ndastp ) &
	463	& .OR.( NINT( z_inc_datef ) > iitend_date ) ) &
	464	& CALL ctl_warn( ' Validity time of assimilation increments is ', &
	465	& ' outside the assimilation interval' )
	466
	467	IF ( ( ln_asmdin ).AND.( NINT( zdate_inc ) /= iitdin_date ) ) &
	468	& CALL ctl_warn( ' Validity time of assimilation increments does ', &
	469	& ' not agree with Direct Initialization time' )
	470
	471	IF ( ln_trainc ) THEN
	472	CALL iom_get( inum, jpdom_autoglo, 'bckint', t_bkginc, 1 )
	473	CALL iom_get( inum, jpdom_autoglo, 'bckins', s_bkginc, 1 )
	474	! Apply the masks
	475	t_bkginc(:,:,:) = t_bkginc(:,:,:) * tmask(:,:,:)
	476	s_bkginc(:,:,:) = s_bkginc(:,:,:) * tmask(:,:,:)
	477	! Set missing increments to 0.0 rather than 1e+20
	478	! to allow for differences in masks
	479	WHERE( ABS( t_bkginc(:,:,:) ) > 1.0e+10 ) t_bkginc(:,:,:) = 0.0
	480	WHERE( ABS( s_bkginc(:,:,:) ) > 1.0e+10 ) s_bkginc(:,:,:) = 0.0
	481	ENDIF
	482
	483	IF ( ln_dyninc ) THEN
	484	CALL iom_get( inum, jpdom_autoglo, 'bckinu', u_bkginc, 1 )
	485	CALL iom_get( inum, jpdom_autoglo, 'bckinv', v_bkginc, 1 )
	486	! Apply the masks
	487	u_bkginc(:,:,:) = u_bkginc(:,:,:) * umask(:,:,:)
	488	v_bkginc(:,:,:) = v_bkginc(:,:,:) * vmask(:,:,:)
	489	! Set missing increments to 0.0 rather than 1e+20
	490	! to allow for differences in masks
	491	WHERE( ABS( u_bkginc(:,:,:) ) > 1.0e+10 ) u_bkginc(:,:,:) = 0.0
	492	WHERE( ABS( v_bkginc(:,:,:) ) > 1.0e+10 ) v_bkginc(:,:,:) = 0.0
	493	ENDIF
	494
	495	IF ( ln_sshinc ) THEN
	496	CALL iom_get( inum, jpdom_autoglo, 'bckineta', ssh_bkginc, 1 )
	497	! Apply the masks
	498	ssh_bkginc(:,:) = ssh_bkginc(:,:) * tmask(:,:,1)
	499	! Set missing increments to 0.0 rather than 1e+20
	500	! to allow for differences in masks
	501	WHERE( ABS( ssh_bkginc(:,:) ) > 1.0e+10 ) ssh_bkginc(:,:) = 0.0
	502	ENDIF
	503
[3764]	504	IF ( ln_seaiceinc ) THEN
	505	CALL iom_get( inum, jpdom_autoglo, 'bckinseaice', seaice_bkginc, 1 )
	506	! Apply the masks
	507	seaice_bkginc(:,:) = seaice_bkginc(:,:) * tmask(:,:,1)
	508	! Set missing increments to 0.0 rather than 1e+20
	509	! to allow for differences in masks
	510	WHERE( ABS( seaice_bkginc(:,:) ) > 1.0e+10 ) seaice_bkginc(:,:) = 0.0
	511	ENDIF
	512
[8428]	513	IF ( ln_logchlinc ) THEN
	514	CALL iom_get( inum, jpdom_autoglo, 'bckinlogchl', logchl_bkginc(:,:), 1 )
	515	! Apply the masks
	516	logchl_bkginc(:,:) = logchl_bkginc(:,:) * tmask(:,:,1)
	517	! Set missing increments to 0.0 rather than 1e+20
	518	! to allow for differences in masks
	519	WHERE( ABS( logchl_bkginc(:,:) ) > 1.0e+10 ) logchl_bkginc(:,:) = 0.0
	520	ENDIF
	521
[2128]	522	CALL iom_close( inum )
	523
	524	ENDIF
	525
	526	!-----------------------------------------------------------------------
[3294]	527	! Apply divergence damping filter
	528	!-----------------------------------------------------------------------
	529
	530	IF ( ln_dyninc .AND. nn_divdmp > 0 ) THEN
	531
[3764]	532	CALL wrk_alloc(jpi,jpj,hdiv)
[3294]	533
[3764]	534	DO jt = 1, nn_divdmp
[3294]	535
[3764]	536	DO jk = 1, jpkm1
[3294]	537
[3764]	538	hdiv(:,:) = 0._wp
[3294]	539
[3764]	540	DO jj = 2, jpjm1
	541	DO ji = fs_2, fs_jpim1 ! vector opt.
	542	hdiv(ji,jj) = &
	543	( e2u(ji ,jj ) * fse3u(ji ,jj ,jk) * u_bkginc(ji ,jj ,jk) &
	544	- e2u(ji-1,jj ) * fse3u(ji-1,jj ,jk) * u_bkginc(ji-1,jj ,jk) &
	545	+ e1v(ji ,jj ) * fse3v(ji ,jj ,jk) * v_bkginc(ji ,jj ,jk) &
	546	- e1v(ji ,jj-1) * fse3v(ji ,jj-1,jk) * v_bkginc(ji ,jj-1,jk) ) &
	547	/ ( e1t(ji,jj) * e2t(ji,jj) * fse3t(ji,jj,jk) )
	548	END DO
[3294]	549	END DO
	550
[3764]	551	CALL lbc_lnk( hdiv, 'T', 1. ) ! lateral boundary cond. (no sign change)
[3294]	552
[3764]	553	DO jj = 2, jpjm1
	554	DO ji = fs_2, fs_jpim1 ! vector opt.
	555	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) &
	556	- e1t(ji ,jj)e2t(ji ,jj) hdiv(ji ,jj) ) &
	557	/ e1u(ji,jj) * umask(ji,jj,jk)
	558	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) &
	559	- e1t(ji,jj )e2t(ji,jj ) hdiv(ji,jj ) ) &
	560	/ e2v(ji,jj) * vmask(ji,jj,jk)
	561	END DO
[3294]	562	END DO
[3764]	563
[3294]	564	END DO
	565
[3764]	566	END DO
[3294]	567
[3764]	568	CALL wrk_dealloc(jpi,jpj,hdiv)
[3294]	569
	570	ENDIF
	571
	572
	573
	574	!-----------------------------------------------------------------------
[2128]	575	! Allocate and initialize the background state arrays
	576	!-----------------------------------------------------------------------
	577
	578	IF ( ln_asmdin ) THEN
	579
	580	ALLOCATE( t_bkg(jpi,jpj,jpk) )
	581	ALLOCATE( s_bkg(jpi,jpj,jpk) )
	582	ALLOCATE( u_bkg(jpi,jpj,jpk) )
	583	ALLOCATE( v_bkg(jpi,jpj,jpk) )
	584	ALLOCATE( ssh_bkg(jpi,jpj) )
	585
	586	t_bkg(:,:,:) = 0.0
	587	s_bkg(:,:,:) = 0.0
	588	u_bkg(:,:,:) = 0.0
	589	v_bkg(:,:,:) = 0.0
	590	ssh_bkg(:,:) = 0.0
	591
	592	!--------------------------------------------------------------------
	593	! Read from file the background state at analysis time
	594	!--------------------------------------------------------------------
	595
	596	CALL iom_open( c_asmdin, inum )
	597
[3764]	598	CALL iom_get( inum, 'rdastp', zdate_bkg )
[2128]	599
	600	IF(lwp) THEN
	601	WRITE(numout,*)
	602	WRITE(numout,*) 'asm_inc_init : Assimilation background state valid at : ', &
	603	& NINT( zdate_bkg )
	604	WRITE(numout,*) '~~~~~~~~~~~~'
	605	ENDIF
	606
	607	IF ( NINT( zdate_bkg ) /= iitdin_date ) &
	608	& CALL ctl_warn( ' Validity time of assimilation background state does', &
	609	& ' not agree with Direct Initialization time' )
	610
	611	IF ( ln_trainc ) THEN
	612	CALL iom_get( inum, jpdom_autoglo, 'tn', t_bkg )
	613	CALL iom_get( inum, jpdom_autoglo, 'sn', s_bkg )
	614	t_bkg(:,:,:) = t_bkg(:,:,:) * tmask(:,:,:)
	615	s_bkg(:,:,:) = s_bkg(:,:,:) * tmask(:,:,:)
	616	ENDIF
	617
	618	IF ( ln_dyninc ) THEN
	619	CALL iom_get( inum, jpdom_autoglo, 'un', u_bkg )
	620	CALL iom_get( inum, jpdom_autoglo, 'vn', v_bkg )
	621	u_bkg(:,:,:) = u_bkg(:,:,:) * umask(:,:,:)
	622	v_bkg(:,:,:) = v_bkg(:,:,:) * vmask(:,:,:)
	623	ENDIF
	624
	625	IF ( ln_sshinc ) THEN
	626	CALL iom_get( inum, jpdom_autoglo, 'sshn', ssh_bkg )
	627	ssh_bkg(:,:) = ssh_bkg(:,:) * tmask(:,:,1)
	628	ENDIF
	629
	630	CALL iom_close( inum )
	631
	632	ENDIF
[8436]	633
	634	#if defined key_hadocc \|\| (defined key_medusa && defined key_foam_medusa)
	635	IF ( ln_logchlinc ) THEN
	636
[8440]	637	ALLOCATE( pgrow_avg_bkg(jpi,jpj) )
	638	ALLOCATE( ploss_avg_bkg(jpi,jpj) )
	639	ALLOCATE( phyt_avg_bkg(jpi,jpj) )
	640	ALLOCATE( mld_max_bkg(jpi,jpj) )
	641	ALLOCATE( tracer_bkg(jpi,jpj,jpk,jptra) )
	642	pgrow_avg_bkg(:,:) = 0.0
	643	ploss_avg_bkg(:,:) = 0.0
	644	phyt_avg_bkg(:,:) = 0.0
	645	mld_max_bkg(:,:) = 0.0
	646	tracer_bkg(:,:,:,:) = 0.0
	647
	648	#if defined key_hadocc
	649	ALLOCATE( chl_bkg(jpi,jpj) )
	650	ALLOCATE( cchl_p_bkg(jpi,jpj) )
	651	chl_bkg(:,:) = 0.0
	652	cchl_p_bkg(:,:) = 0.0
	653	#endif
[8436]	654
[8440]	655	!--------------------------------------------------------------------
	656	! Read background variables for logchl assimilation
	657	! Some only required if performing balancing
	658	!--------------------------------------------------------------------
	659
	660	CALL iom_open( c_asmbkg, inum )
	661
	662	#if defined key_hadocc
	663	CALL iom_get( inum, jpdom_autoglo, 'hadocc_chl', chl_bkg )
	664	CALL iom_get( inum, jpdom_autoglo, 'hadocc_cchl', cchl_p_bkg )
	665	chl_bkg(:,:) = chl_bkg(:,:) * tmask(:,:,1)
	666	cchl_p_bkg(:,:) = cchl_p_bkg(:,:) * tmask(:,:,1)
	667	#elif defined key_medusa
	668	CALL iom_get( inum, jpdom_autoglo, 'medusa_chn', tracer_bkg(:,:,:,jpchn) )
	669	CALL iom_get( inum, jpdom_autoglo, 'medusa_chd', tracer_bkg(:,:,:,jpchd) )
	670	#endif
	671
[8436]	672	IF ( ln_logchlbal ) THEN
	673
	674	CALL iom_get( inum, jpdom_autoglo, 'pgrow_avg', pgrow_avg_bkg )
	675	CALL iom_get( inum, jpdom_autoglo, 'ploss_avg', ploss_avg_bkg )
	676	CALL iom_get( inum, jpdom_autoglo, 'phyt_avg', phyt_avg_bkg )
	677	CALL iom_get( inum, jpdom_autoglo, 'mld_max', mld_max_bkg )
	678	pgrow_avg_bkg(:,:) = pgrow_avg_bkg(:,:) * tmask(:,:,1)
	679	ploss_avg_bkg(:,:) = ploss_avg_bkg(:,:) * tmask(:,:,1)
	680	phyt_avg_bkg(:,:) = phyt_avg_bkg(:,:) * tmask(:,:,1)
	681	mld_max_bkg(:,:) = mld_max_bkg(:,:) * tmask(:,:,1)
	682
[8440]	683	#if defined key_hadocc
	684	CALL iom_get( inum, jpdom_autoglo, 'hadocc_nut', tracer_bkg(:,:,:,jp_had_nut) )
	685	CALL iom_get( inum, jpdom_autoglo, 'hadocc_phy', tracer_bkg(:,:,:,jp_had_phy) )
	686	CALL iom_get( inum, jpdom_autoglo, 'hadocc_zoo', tracer_bkg(:,:,:,jp_had_zoo) )
	687	CALL iom_get( inum, jpdom_autoglo, 'hadocc_pdn', tracer_bkg(:,:,:,jp_had_pdn) )
	688	CALL iom_get( inum, jpdom_autoglo, 'hadocc_dic', tracer_bkg(:,:,:,jp_had_dic) )
	689	CALL iom_get( inum, jpdom_autoglo, 'hadocc_alk', tracer_bkg(:,:,:,jp_had_alk) )
	690	#elif defined key_medusa
	691	CALL iom_get( inum, jpdom_autoglo, 'medusa_phn', tracer_bkg(:,:,:,jpphn) )
	692	CALL iom_get( inum, jpdom_autoglo, 'medusa_phd', tracer_bkg(:,:,:,jpphd) )
	693	CALL iom_get( inum, jpdom_autoglo, 'medusa_pds', tracer_bkg(:,:,:,jppds) )
	694	CALL iom_get( inum, jpdom_autoglo, 'medusa_zmi', tracer_bkg(:,:,:,jpzmi) )
	695	CALL iom_get( inum, jpdom_autoglo, 'medusa_zme', tracer_bkg(:,:,:,jpzme) )
	696	CALL iom_get( inum, jpdom_autoglo, 'medusa_din', tracer_bkg(:,:,:,jpdin) )
	697	CALL iom_get( inum, jpdom_autoglo, 'medusa_sil', tracer_bkg(:,:,:,jpsil) )
	698	CALL iom_get( inum, jpdom_autoglo, 'medusa_fer', tracer_bkg(:,:,:,jpfer) )
	699	CALL iom_get( inum, jpdom_autoglo, 'medusa_det', tracer_bkg(:,:,:,jpdet) )
	700	CALL iom_get( inum, jpdom_autoglo, 'medusa_dtc', tracer_bkg(:,:,:,jpdtc) )
	701	CALL iom_get( inum, jpdom_autoglo, 'medusa_dic', tracer_bkg(:,:,:,jpdic) )
	702	CALL iom_get( inum, jpdom_autoglo, 'medusa_alk', tracer_bkg(:,:,:,jpalk) )
	703	CALL iom_get( inum, jpdom_autoglo, 'medusa_oxy', tracer_bkg(:,:,:,jpoxy) )
	704	#endif
	705	ENDIF
	706
	707	CALL iom_close( inum )
[8436]	708
[8440]	709	DO jt = 1, jptra
	710	tracer_bkg(:,:,:,jt) = tracer_bkg(:,:,:,jt) * tmask(:,:,:)
	711	END DO
[8436]	712
	713	ENDIF
	714	#endif
[2392]	715	!
[2128]	716	END SUBROUTINE asm_inc_init
	717
[2392]	718
[2128]	719	SUBROUTINE calc_date( kit000, kt, kdate0, kdate )
	720	!!----------------------------------------------------------------------
	721	!! * ROUTINE calc_date *
	722	!!
	723	!! ** Purpose : Compute the calendar date YYYYMMDD at a given time step.
	724	!!
	725	!! ** Method : Compute the calendar date YYYYMMDD at a given time step.
	726	!!
	727	!! ** Action :
	728	!!----------------------------------------------------------------------
	729	INTEGER, INTENT(IN) :: kit000 ! Initial time step
	730	INTEGER, INTENT(IN) :: kt ! Current time step referenced to kit000
	731	INTEGER, INTENT(IN) :: kdate0 ! Initial date
	732	INTEGER, INTENT(OUT) :: kdate ! Current date reference to kdate0
[2392]	733	!
[2128]	734	INTEGER :: iyea0 ! Initial year
	735	INTEGER :: imon0 ! Initial month
	736	INTEGER :: iday0 ! Initial day
	737	INTEGER :: iyea ! Current year
	738	INTEGER :: imon ! Current month
	739	INTEGER :: iday ! Current day
	740	INTEGER :: idaystp ! Number of days between initial and current date
	741	INTEGER :: idaycnt ! Day counter
	742
	743	INTEGER, DIMENSION(12) :: imonth_len !: length in days of the months of the current year
	744
	745	!-----------------------------------------------------------------------
	746	! Compute the calendar date YYYYMMDD
	747	!-----------------------------------------------------------------------
	748
	749	! Initial date
	750	iyea0 = kdate0 / 10000
	751	imon0 = ( kdate0 - ( iyea0 * 10000 ) ) / 100
	752	iday0 = kdate0 - ( iyea0 * 10000 ) - ( imon0 * 100 )
	753
	754	! Check that kt >= kit000 - 1
	755	IF ( kt < kit000 - 1 ) CALL ctl_stop( ' kt must be >= kit000 - 1')
	756
	757	! If kt = kit000 - 1 then set the date to the restart date
	758	IF ( kt == kit000 - 1 ) THEN
	759
	760	kdate = ndastp
	761	RETURN
	762
	763	ENDIF
	764
	765	! Compute the number of days from the initial date
	766	idaystp = INT( REAL( kt - kit000 ) * rdt / 86400. )
	767
	768	iday = iday0
	769	imon = imon0
	770	iyea = iyea0
	771	idaycnt = 0
	772
	773	CALL calc_month_len( iyea, imonth_len )
	774
	775	DO WHILE ( idaycnt < idaystp )
	776	iday = iday + 1
	777	IF ( iday > imonth_len(imon) ) THEN
	778	iday = 1
	779	imon = imon + 1
	780	ENDIF
	781	IF ( imon > 12 ) THEN
	782	imon = 1
	783	iyea = iyea + 1
	784	CALL calc_month_len( iyea, imonth_len ) ! update month lengths
	785	ENDIF
	786	idaycnt = idaycnt + 1
	787	END DO
[2392]	788	!
[2128]	789	kdate = iyea * 10000 + imon * 100 + iday
[2392]	790	!
[2128]	791	END SUBROUTINE
	792
[2392]	793
[2128]	794	SUBROUTINE calc_month_len( iyear, imonth_len )
	795	!!----------------------------------------------------------------------
	796	!! * ROUTINE calc_month_len *
	797	!!
	798	!! ** Purpose : Compute the number of days in a months given a year.
	799	!!
	800	!! ** Method :
	801	!!----------------------------------------------------------------------
	802	INTEGER, DIMENSION(12) :: imonth_len !: length in days of the months of the current year
	803	INTEGER :: iyear !: year
[2392]	804	!!----------------------------------------------------------------------
	805	!
[2128]	806	! length of the month of the current year (from nleapy, read in namelist)
	807	IF ( nleapy < 2 ) THEN
	808	imonth_len(:) = (/ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 /)
	809	IF ( nleapy == 1 ) THEN ! we are using calendar with leap years
	810	IF ( MOD(iyear, 4) == 0 .AND. ( MOD(iyear, 400) == 0 .OR. MOD(iyear, 100) /= 0 ) ) THEN
	811	imonth_len(2) = 29
	812	ENDIF
	813	ENDIF
	814	ELSE
	815	imonth_len(:) = nleapy ! all months with nleapy days per year
	816	ENDIF
[2392]	817	!
[2128]	818	END SUBROUTINE
	819
[2392]	820
[2128]	821	SUBROUTINE tra_asm_inc( kt )
	822	!!----------------------------------------------------------------------
	823	!! * ROUTINE tra_asm_inc *
	824	!!
	825	!! ** Purpose : Apply the tracer (T and S) assimilation increments
	826	!!
	827	!! ** Method : Direct initialization or Incremental Analysis Updating
	828	!!
	829	!! ** Action :
	830	!!----------------------------------------------------------------------
	831	INTEGER, INTENT(IN) :: kt ! Current time step
[2392]	832	!
[2128]	833	INTEGER :: ji,jj,jk
	834	INTEGER :: it
	835	REAL(wp) :: zincwgt ! IAU weight for current time step
[3764]	836	REAL (wp), DIMENSION(jpi,jpj,jpk) :: fzptnz ! 3d freezing point values
[2392]	837	!!----------------------------------------------------------------------
[2128]	838
[3764]	839	! freezing point calculation taken from oc_fz_pt (but calculated for all depths)
	840	! used to prevent the applied increments taking the temperature below the local freezing point
	841
[4990]	842	DO jk = 1, jpkm1
[6498]	843	CALL eos_fzp( tsn(:,:,jk,jp_sal), fzptnz(:,:,jk), fsdept(:,:,jk) )
[4990]	844	END DO
[3764]	845
[2128]	846	IF ( ln_asmiau ) THEN
	847
	848	!--------------------------------------------------------------------
	849	! Incremental Analysis Updating
	850	!--------------------------------------------------------------------
	851
	852	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	853
	854	it = kt - nit000 + 1
	855	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
	856
	857	IF(lwp) THEN
	858	WRITE(numout,*)
[4990]	859	WRITE(numout,*) 'tra_asm_inc : Tracer IAU at time step = ', kt,' with IAU weight = ', wgtiau(it)
[2128]	860	WRITE(numout,*) '~~~~~~~~~~~~'
	861	ENDIF
	862
	863	! Update the tracer tendencies
	864	DO jk = 1, jpkm1
[3764]	865	IF (ln_temnofreeze) THEN
	866	! Do not apply negative increments if the temperature will fall below freezing
	867	WHERE(t_bkginc(:,:,jk) > 0.0_wp .OR. &
	868	& tsn(:,:,jk,jp_tem) + tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * wgtiau(it) > fzptnz(:,:,jk) )
	869	tsa(:,:,jk,jp_tem) = tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * zincwgt
	870	END WHERE
	871	ELSE
	872	tsa(:,:,jk,jp_tem) = tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * zincwgt
	873	ENDIF
	874	IF (ln_salfix) THEN
	875	! Do not apply negative increments if the salinity will fall below a specified
	876	! minimum value salfixmin
	877	WHERE(s_bkginc(:,:,jk) > 0.0_wp .OR. &
	878	& tsn(:,:,jk,jp_sal) + tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * wgtiau(it) > salfixmin )
	879	tsa(:,:,jk,jp_sal) = tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * zincwgt
	880	END WHERE
	881	ELSE
	882	tsa(:,:,jk,jp_sal) = tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * zincwgt
	883	ENDIF
[2128]	884	END DO
	885
	886	ENDIF
	887
	888	IF ( kt == nitiaufin_r + 1 ) THEN ! For bias crcn to work
	889	DEALLOCATE( t_bkginc )
	890	DEALLOCATE( s_bkginc )
	891	ENDIF
	892
	893
	894	ELSEIF ( ln_asmdin ) THEN
	895
	896	!--------------------------------------------------------------------
	897	! Direct Initialization
	898	!--------------------------------------------------------------------
	899
	900	IF ( kt == nitdin_r ) THEN
	901
	902	neuler = 0 ! Force Euler forward step
	903
	904	! Initialize the now fields with the background + increment
[3764]	905	IF (ln_temnofreeze) THEN
	906	! Do not apply negative increments if the temperature will fall below freezing
[4990]	907	WHERE( t_bkginc(:,:,:) > 0.0_wp .OR. tsn(:,:,:,jp_tem) + t_bkginc(:,:,:) > fzptnz(:,:,:) )
[3764]	908	tsn(:,:,:,jp_tem) = t_bkg(:,:,:) + t_bkginc(:,:,:)
	909	END WHERE
	910	ELSE
	911	tsn(:,:,:,jp_tem) = t_bkg(:,:,:) + t_bkginc(:,:,:)
	912	ENDIF
[2128]	913	IF (ln_salfix) THEN
[3764]	914	! Do not apply negative increments if the salinity will fall below a specified
	915	! minimum value salfixmin
[4990]	916	WHERE( s_bkginc(:,:,:) > 0.0_wp .OR. tsn(:,:,:,jp_sal) + s_bkginc(:,:,:) > salfixmin )
[3764]	917	tsn(:,:,:,jp_sal) = s_bkg(:,:,:) + s_bkginc(:,:,:)
	918	END WHERE
	919	ELSE
	920	tsn(:,:,:,jp_sal) = s_bkg(:,:,:) + s_bkginc(:,:,:)
[2128]	921	ENDIF
	922
[4990]	923	tsb(:,:,:,:) = tsn(:,:,:,:) ! Update before fields
[2128]	924
[4990]	925	CALL eos( tsb, rhd, rhop, gdept_0(:,:,:) ) ! Before potential and in situ densities
	926	!!gm fabien
	927	! CALL eos( tsb, rhd, rhop ) ! Before potential and in situ densities
	928	!!gm
	929
	930
[5120]	931	IF( ln_zps .AND. .NOT. lk_c1d .AND. .NOT. ln_isfcav) &
	932	& CALL zps_hde ( kt, jpts, tsb, gtsu, gtsv, & ! Partial steps: before horizontal gradient
	933	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
	934	IF( ln_zps .AND. .NOT. lk_c1d .AND. ln_isfcav) &
	935	& CALL zps_hde_isf( nit000, jpts, tsb, gtsu, gtsv, & ! Partial steps for top cell (ISF)
	936	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
	937	& gtui, gtvi, grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi ) ! of t, s, rd at the last ocean level
[2128]	938
[3764]	939	#if defined key_zdfkpp
[4313]	940	CALL eos( tsn, rhd, fsdept_n(:,:,:) ) ! Compute rhd
[4990]	941	!!gm fabien CALL eos( tsn, rhd ) ! Compute rhd
[3764]	942	#endif
	943
[2128]	944	DEALLOCATE( t_bkginc )
	945	DEALLOCATE( s_bkginc )
	946	DEALLOCATE( t_bkg )
	947	DEALLOCATE( s_bkg )
	948	ENDIF
[2392]	949	!
[2128]	950	ENDIF
[7962]	951	! Perhaps the following call should be in step
	952	IF ( ln_seaiceinc ) CALL seaice_asm_inc ( kt ) ! apply sea ice concentration increment
[2392]	953	!
[2128]	954	END SUBROUTINE tra_asm_inc
	955
[2392]	956
[2128]	957	SUBROUTINE dyn_asm_inc( kt )
	958	!!----------------------------------------------------------------------
	959	!! * ROUTINE dyn_asm_inc *
	960	!!
	961	!! ** Purpose : Apply the dynamics (u and v) assimilation increments.
	962	!!
	963	!! ** Method : Direct initialization or Incremental Analysis Updating.
	964	!!
	965	!! ** Action :
	966	!!----------------------------------------------------------------------
	967	INTEGER, INTENT(IN) :: kt ! Current time step
[2392]	968	!
[2128]	969	INTEGER :: jk
	970	INTEGER :: it
	971	REAL(wp) :: zincwgt ! IAU weight for current time step
[2392]	972	!!----------------------------------------------------------------------
[2128]	973
	974	IF ( ln_asmiau ) THEN
	975
	976	!--------------------------------------------------------------------
	977	! Incremental Analysis Updating
	978	!--------------------------------------------------------------------
	979
	980	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	981
	982	it = kt - nit000 + 1
	983	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
	984
	985	IF(lwp) THEN
	986	WRITE(numout,*)
	987	WRITE(numout,*) 'dyn_asm_inc : Dynamics IAU at time step = ', &
	988	& kt,' with IAU weight = ', wgtiau(it)
	989	WRITE(numout,*) '~~~~~~~~~~~~'
	990	ENDIF
	991
	992	! Update the dynamic tendencies
	993	DO jk = 1, jpkm1
	994	ua(:,:,jk) = ua(:,:,jk) + u_bkginc(:,:,jk) * zincwgt
	995	va(:,:,jk) = va(:,:,jk) + v_bkginc(:,:,jk) * zincwgt
	996	END DO
	997
	998	IF ( kt == nitiaufin_r ) THEN
	999	DEALLOCATE( u_bkginc )
	1000	DEALLOCATE( v_bkginc )
	1001	ENDIF
	1002
	1003	ENDIF
	1004
	1005	ELSEIF ( ln_asmdin ) THEN
	1006
	1007	!--------------------------------------------------------------------
	1008	! Direct Initialization
	1009	!--------------------------------------------------------------------
	1010
	1011	IF ( kt == nitdin_r ) THEN
	1012
	1013	neuler = 0 ! Force Euler forward step
	1014
	1015	! Initialize the now fields with the background + increment
	1016	un(:,:,:) = u_bkg(:,:,:) + u_bkginc(:,:,:)
	1017	vn(:,:,:) = v_bkg(:,:,:) + v_bkginc(:,:,:)
	1018
	1019	ub(:,:,:) = un(:,:,:) ! Update before fields
	1020	vb(:,:,:) = vn(:,:,:)
	1021
	1022	DEALLOCATE( u_bkg )
	1023	DEALLOCATE( v_bkg )
	1024	DEALLOCATE( u_bkginc )
	1025	DEALLOCATE( v_bkginc )
	1026	ENDIF
[2392]	1027	!
[2128]	1028	ENDIF
[2392]	1029	!
[2128]	1030	END SUBROUTINE dyn_asm_inc
	1031
[2392]	1032
[2128]	1033	SUBROUTINE ssh_asm_inc( kt )
	1034	!!----------------------------------------------------------------------
	1035	!! * ROUTINE ssh_asm_inc *
	1036	!!
	1037	!! ** Purpose : Apply the sea surface height assimilation increment.
	1038	!!
	1039	!! ** Method : Direct initialization or Incremental Analysis Updating.
	1040	!!
	1041	!! ** Action :
	1042	!!----------------------------------------------------------------------
	1043	INTEGER, INTENT(IN) :: kt ! Current time step
[2392]	1044	!
[2128]	1045	INTEGER :: it
[3764]	1046	INTEGER :: jk
[2128]	1047	REAL(wp) :: zincwgt ! IAU weight for current time step
[2392]	1048	!!----------------------------------------------------------------------
[2128]	1049
	1050	IF ( ln_asmiau ) THEN
	1051
	1052	!--------------------------------------------------------------------
	1053	! Incremental Analysis Updating
	1054	!--------------------------------------------------------------------
	1055
	1056	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	1057
	1058	it = kt - nit000 + 1
	1059	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
	1060
	1061	IF(lwp) THEN
	1062	WRITE(numout,*)
	1063	WRITE(numout,*) 'ssh_asm_inc : SSH IAU at time step = ', &
	1064	& kt,' with IAU weight = ', wgtiau(it)
	1065	WRITE(numout,*) '~~~~~~~~~~~~'
	1066	ENDIF
	1067
	1068	! Save the tendency associated with the IAU weighted SSH increment
	1069	! (applied in dynspg.*)
	1070	#if defined key_asminc
	1071	ssh_iau(:,:) = ssh_bkginc(:,:) * zincwgt
	1072	#endif
	1073	IF ( kt == nitiaufin_r ) THEN
	1074	DEALLOCATE( ssh_bkginc )
	1075	ENDIF
	1076
[8400]	1077	ELSE
	1078	#if defined key_asminc
	1079	ssh_iau(:,:) = 0.0
	1080	#endif
[2128]	1081	ENDIF
	1082
	1083	ELSEIF ( ln_asmdin ) THEN
	1084
	1085	!--------------------------------------------------------------------
	1086	! Direct Initialization
	1087	!--------------------------------------------------------------------
	1088
	1089	IF ( kt == nitdin_r ) THEN
	1090
	1091	neuler = 0 ! Force Euler forward step
	1092
	1093	! Initialize the now fields the background + increment
	1094	sshn(:,:) = ssh_bkg(:,:) + ssh_bkginc(:,:)
	1095
[3764]	1096	! Update before fields
	1097	sshb(:,:) = sshn(:,:)
[2128]	1098
[3764]	1099	IF( lk_vvl ) THEN
	1100	DO jk = 1, jpk
	1101	fse3t_b(:,:,jk) = fse3t_n(:,:,jk)
	1102	END DO
	1103	ENDIF
	1104
[2128]	1105	DEALLOCATE( ssh_bkg )
	1106	DEALLOCATE( ssh_bkginc )
	1107
	1108	ENDIF
[2392]	1109	!
[2128]	1110	ENDIF
[2392]	1111	!
[2128]	1112	END SUBROUTINE ssh_asm_inc
	1113
[3785]	1114
[3764]	1115	SUBROUTINE seaice_asm_inc( kt, kindic )
	1116	!!----------------------------------------------------------------------
	1117	!! * ROUTINE seaice_asm_inc *
	1118	!!
	1119	!! ** Purpose : Apply the sea ice assimilation increment.
	1120	!!
	1121	!! ** Method : Direct initialization or Incremental Analysis Updating.
	1122	!!
	1123	!! ** Action :
	1124	!!
	1125	!!----------------------------------------------------------------------
	1126	IMPLICIT NONE
[3785]	1127	!
	1128	INTEGER, INTENT(in) :: kt ! Current time step
	1129	INTEGER, INTENT(in), OPTIONAL :: kindic ! flag for disabling the deallocation
	1130	!
	1131	INTEGER :: it
	1132	REAL(wp) :: zincwgt ! IAU weight for current time step
	1133	#if defined key_lim2
	1134	REAL(wp), DIMENSION(jpi,jpj) :: zofrld, zohicif, zseaicendg, zhicifinc ! LIM
	1135	REAL(wp) :: zhicifmin = 0.5_wp ! ice minimum depth in metres
[3764]	1136	#endif
[3785]	1137	!!----------------------------------------------------------------------
[3764]	1138
	1139	IF ( ln_asmiau ) THEN
	1140
	1141	!--------------------------------------------------------------------
	1142	! Incremental Analysis Updating
	1143	!--------------------------------------------------------------------
	1144
	1145	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	1146
	1147	it = kt - nit000 + 1
	1148	zincwgt = wgtiau(it) ! IAU weight for the current time step
	1149	! note this is not a tendency so should not be divided by rdt (as with the tracer and other increments)
	1150
	1151	IF(lwp) THEN
	1152	WRITE(numout,*)
	1153	WRITE(numout,*) 'seaice_asm_inc : sea ice conc IAU at time step = ', &
	1154	& kt,' with IAU weight = ', wgtiau(it)
	1155	WRITE(numout,*) '~~~~~~~~~~~~'
	1156	ENDIF
	1157
[3785]	1158	! Sea-ice : LIM-3 case (to add)
[3764]	1159
[3785]	1160	#if defined key_lim2
	1161	! Sea-ice : LIM-2 case
	1162	zofrld (:,:) = frld(:,:)
	1163	zohicif(:,:) = hicif(:,:)
	1164	!
	1165	frld = MIN( MAX( frld (:,:) - seaice_bkginc(:,:) * zincwgt, 0.0_wp), 1.0_wp)
[3764]	1166	pfrld = MIN( MAX( pfrld(:,:) - seaice_bkginc(:,:) * zincwgt, 0.0_wp), 1.0_wp)
	1167	fr_i(:,:) = 1.0_wp - frld(:,:) ! adjust ice fraction
[3785]	1168	!
	1169	zseaicendg(:,:) = zofrld(:,:) - frld(:,:) ! find out actual sea ice nudge applied
	1170	!
[3764]	1171	! Nudge sea ice depth to bring it up to a required minimum depth
	1172	WHERE( zseaicendg(:,:) > 0.0_wp .AND. hicif(:,:) < zhicifmin )
	1173	zhicifinc(:,:) = (zhicifmin - hicif(:,:)) * zincwgt
	1174	ELSEWHERE
	1175	zhicifinc(:,:) = 0.0_wp
	1176	END WHERE
[3785]	1177	!
	1178	! nudge ice depth
	1179	hicif (:,:) = hicif (:,:) + zhicifinc(:,:)
	1180	phicif(:,:) = phicif(:,:) + zhicifinc(:,:)
	1181	!
	1182	! seaice salinity balancing (to add)
[3764]	1183	#endif
	1184
[4245]	1185	#if defined key_cice && defined key_asminc
[3785]	1186	! Sea-ice : CICE case. Pass ice increment tendency into CICE
[3764]	1187	ndaice_da(:,:) = seaice_bkginc(:,:) * zincwgt / rdt
	1188	#endif
	1189
	1190	IF ( kt == nitiaufin_r ) THEN
	1191	DEALLOCATE( seaice_bkginc )
	1192	ENDIF
	1193
	1194	ELSE
	1195
[4245]	1196	#if defined key_cice && defined key_asminc
[3785]	1197	! Sea-ice : CICE case. Zero ice increment tendency into CICE
[3764]	1198	ndaice_da(:,:) = 0.0_wp
	1199	#endif
	1200
	1201	ENDIF
	1202
	1203	ELSEIF ( ln_asmdin ) THEN
	1204
	1205	!--------------------------------------------------------------------
	1206	! Direct Initialization
	1207	!--------------------------------------------------------------------
	1208
	1209	IF ( kt == nitdin_r ) THEN
	1210
	1211	neuler = 0 ! Force Euler forward step
	1212
[3785]	1213	! Sea-ice : LIM-3 case (to add)
[3764]	1214
[3785]	1215	#if defined key_lim2
	1216	! Sea-ice : LIM-2 case.
[3764]	1217	zofrld(:,:)=frld(:,:)
	1218	zohicif(:,:)=hicif(:,:)
[3785]	1219	!
[3764]	1220	! Initialize the now fields the background + increment
[3785]	1221	frld (:,:) = MIN( MAX( frld(:,:) - seaice_bkginc(:,:), 0.0_wp), 1.0_wp)
[3764]	1222	pfrld(:,:) = frld(:,:)
[3785]	1223	fr_i (:,:) = 1.0_wp - frld(:,:) ! adjust ice fraction
	1224	zseaicendg(:,:) = zofrld(:,:) - frld(:,:) ! find out actual sea ice nudge applied
	1225	!
[3764]	1226	! Nudge sea ice depth to bring it up to a required minimum depth
	1227	WHERE( zseaicendg(:,:) > 0.0_wp .AND. hicif(:,:) < zhicifmin )
	1228	zhicifinc(:,:) = (zhicifmin - hicif(:,:)) * zincwgt
	1229	ELSEWHERE
	1230	zhicifinc(:,:) = 0.0_wp
	1231	END WHERE
[3785]	1232	!
	1233	! nudge ice depth
	1234	hicif (:,:) = hicif (:,:) + zhicifinc(:,:)
	1235	phicif(:,:) = phicif(:,:)
	1236	!
	1237	! seaice salinity balancing (to add)
[3764]	1238	#endif
	1239
[4245]	1240	#if defined key_cice && defined key_asminc
	1241	! Sea-ice : CICE case. Pass ice increment tendency into CICE
[3764]	1242	ndaice_da(:,:) = seaice_bkginc(:,:) / rdt
	1243	#endif
	1244	IF ( .NOT. PRESENT(kindic) ) THEN
	1245	DEALLOCATE( seaice_bkginc )
	1246	END IF
	1247
	1248	ELSE
	1249
[4245]	1250	#if defined key_cice && defined key_asminc
[3785]	1251	! Sea-ice : CICE case. Zero ice increment tendency into CICE
[3764]	1252	ndaice_da(:,:) = 0.0_wp
	1253	#endif
	1254
	1255	ENDIF
	1256
[3785]	1257	!#if defined defined key_lim2 \|\| defined key_cice
[3764]	1258	!
	1259	! IF (ln_seaicebal ) THEN
	1260	! !! balancing salinity increments
	1261	! !! simple case from limflx.F90 (doesn't include a mass flux)
	1262	! !! assumption is that as ice concentration is reduced or increased
	1263	! !! the snow and ice depths remain constant
	1264	! !! note that snow is being created where ice concentration is being increased
	1265	! !! - could be more sophisticated and
	1266	! !! not do this (but would need to alter h_snow)
	1267	!
	1268	! usave(:,:,:)=sb(:,:,:) ! use array as a temporary store
	1269	!
	1270	! DO jj = 1, jpj
	1271	! DO ji = 1, jpi
	1272	! ! calculate change in ice and snow mass per unit area
	1273	! ! positive values imply adding salt to the ocean (results from ice formation)
	1274	! ! fwf : ice formation and melting
	1275	!
	1276	! zfons = ( -nfresh_da(ji,jj)soce + nfsalt_da(ji,jj) )rdt
	1277	!
	1278	! ! change salinity down to mixed layer depth
	1279	! mld=hmld_kara(ji,jj)
	1280	!
	1281	! ! prevent small mld
	1282	! ! less than 10m can cause salinity instability
	1283	! IF (mld < 10) mld=10
	1284	!
	1285	! ! set to bottom of a level
	1286	! DO jk = jpk-1, 2, -1
	1287	! IF ((mld > gdepw(ji,jj,jk)) .and. (mld < gdepw(ji,jj,jk+1))) THEN
	1288	! mld=gdepw(ji,jj,jk+1)
	1289	! jkmax=jk
	1290	! ENDIF
	1291	! ENDDO
	1292	!
	1293	! ! avoid applying salinity balancing in shallow water or on land
	1294	! !
	1295	!
	1296	! ! dsal_ocn (psu kg m^-2) / (kg m^-3 * m)
	1297	!
	1298	! dsal_ocn=0.0_wp
	1299	! sal_thresh=5.0_wp ! minimum salinity threshold for salinity balancing
	1300	!
	1301	! if (tmask(ji,jj,1) > 0 .AND. tmask(ji,jj,jkmax) > 0 ) &
	1302	! dsal_ocn = zfons / (rhop(ji,jj,1) * mld)
	1303	!
	1304	! ! put increments in for levels in the mixed layer
	1305	! ! but prevent salinity below a threshold value
	1306	!
	1307	! DO jk = 1, jkmax
	1308	!
	1309	! IF (dsal_ocn > 0.0_wp .or. sb(ji,jj,jk)+dsal_ocn > sal_thresh) THEN
	1310	! sb(ji,jj,jk) = sb(ji,jj,jk) + dsal_ocn
	1311	! sn(ji,jj,jk) = sn(ji,jj,jk) + dsal_ocn
	1312	! ENDIF
	1313	!
	1314	! ENDDO
	1315	!
	1316	! ! ! salt exchanges at the ice/ocean interface
	1317	! ! zpmess = zfons / rdt_ice ! rdt_ice is ice timestep
	1318	! !
	1319	! !! Adjust fsalt. A +ve fsalt means adding salt to ocean
	1320	! !! fsalt(ji,jj) = fsalt(ji,jj) + zpmess ! adjust fsalt
	1321	! !!
	1322	! !! emps(ji,jj) = emps(ji,jj) + zpmess ! or adjust emps (see icestp1d)
	1323	! !! ! E-P (kg m-2 s-2)
	1324	! ! emp(ji,jj) = emp(ji,jj) + zpmess ! E-P (kg m-2 s-2)
	1325	! ENDDO !ji
	1326	! ENDDO !jj!
	1327	!
	1328	! ENDIF !ln_seaicebal
	1329	!
	1330	!#endif
	1331
	1332	ENDIF
	1333
	1334	END SUBROUTINE seaice_asm_inc
[8428]	1335
	1336	SUBROUTINE logchl_asm_inc( kt )
	1337	!!----------------------------------------------------------------------
	1338	!! * ROUTINE logchl_asm_inc *
	1339	!!
	1340	!! ** Purpose : Apply the chlorophyll assimilation increments.
	1341	!!
	1342	!! ** Method : Calculate increments to state variables using nitrogen
	1343	!! balancing.
	1344	!! Direct initialization or Incremental Analysis Updating.
	1345	!!
	1346	!! ** Action :
	1347	!!----------------------------------------------------------------------
	1348	INTEGER, INTENT(IN) :: kt ! Current time step
	1349	!
	1350	INTEGER :: jk ! Loop counter
	1351	INTEGER :: it ! Index
	1352	REAL(wp) :: zincwgt ! IAU weight for current time step
	1353	REAL(wp) :: zincper ! IAU interval in seconds
	1354	!!----------------------------------------------------------------------
	1355
	1356	IF ( kt <= nit000 ) THEN
	1357
	1358	zincper = (nitiaufin_r - nitiaustr_r + 1) * rdt
	1359
	1360	#if defined key_medusa && defined key_foam_medusa
[8436]	1361	CALL asm_logchl_bal_medusa( logchl_bkginc, zincper, mld_choice_bgc, &
	1362	& rn_maxchlinc, ln_logchlbal, &
	1363	& pgrow_avg_bkg, ploss_avg_bkg, &
	1364	& phyt_avg_bkg, mld_max_bkg, &
[8440]	1365	& tracer_bkg, logchl_balinc )
[8428]	1366	#elif defined key_hadocc
	1367	CALL asm_logchl_bal_hadocc( logchl_bkginc, zincper, mld_choice_bgc, &
[8436]	1368	& rn_maxchlinc, ln_logchlbal, &
	1369	& pgrow_avg_bkg, ploss_avg_bkg, &
	1370	& phyt_avg_bkg, mld_max_bkg, &
[8440]	1371	& chl_bkg, cchl_p_bkg, &
	1372	& tracer_bkg, logchl_balinc )
[8428]	1373	#else
	1374	CALL ctl_stop( 'Attempting to assimilate logchl, ', &
	1375	& 'but not defined a biogeochemical model' )
	1376	#endif
	1377
	1378	ENDIF
	1379
	1380	IF ( ln_asmiau ) THEN
	1381
	1382	!--------------------------------------------------------------------
	1383	! Incremental Analysis Updating
	1384	!--------------------------------------------------------------------
	1385
	1386	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	1387
	1388	it = kt - nit000 + 1
	1389	zincwgt = wgtiau(it) ! IAU weight for the current time step
	1390	! note this is not a tendency so should not be divided by rdt
	1391
	1392	IF(lwp) THEN
	1393	WRITE(numout,*)
	1394	WRITE(numout,*) 'logchl_asm_inc : logchl IAU at time step = ', &
	1395	& kt,' with IAU weight = ', wgtiau(it)
	1396	WRITE(numout,*) '~~~~~~~~~~~~'
	1397	ENDIF
	1398
	1399	! Update the biogeochemical variables
	1400	! Add directly to trn and trb, rather than to tra, as not a tendency
	1401	#if defined key_medusa && defined key_foam_medusa
	1402	DO jk = 1, jpkm1
	1403	trn(:,:,jk,jp_msa0:jp_msa1) = trn(:,:,jk,jp_msa0:jp_msa1) + &
	1404	& logchl_balinc(:,:,jk,jp_msa0:jp_msa1) * zincwgt
	1405	trb(:,:,jk,jp_msa0:jp_msa1) = trb(:,:,jk,jp_msa0:jp_msa1) + &
	1406	& logchl_balinc(:,:,jk,jp_msa0:jp_msa1) * zincwgt
	1407	END DO
	1408	#elif defined key_hadocc
	1409	DO jk = 1, jpkm1
	1410	trn(:,:,jk,jp_had0:jp_had1) = trn(:,:,jk,jp_had0:jp_had1) + &
	1411	& logchl_balinc(:,:,jk,jp_had0:jp_had1) * zincwgt
	1412	trb(:,:,jk,jp_had0:jp_had1) = trb(:,:,jk,jp_had0:jp_had1) + &
	1413	& logchl_balinc(:,:,jk,jp_had0:jp_had1) * zincwgt
	1414	END DO
	1415	#endif
	1416
	1417	! Do not deallocate arrays - needed by asm_bal_wri
	1418	! which is called at end of model run
	1419	ENDIF
	1420
	1421	ELSEIF ( ln_asmdin ) THEN
	1422
	1423	!--------------------------------------------------------------------
	1424	! Direct Initialization
	1425	!--------------------------------------------------------------------
	1426
	1427	IF ( kt == nitdin_r ) THEN
	1428
	1429	neuler = 0 ! Force Euler forward step
	1430
	1431	#if defined key_medusa && defined key_foam_medusa
	1432	! Initialize the now fields with the background + increment
	1433	! Background currently is what the model is initialised with
	1434	CALL ctl_warn( ' Doing direct initialisation of MEDUSA with chlorophyll assimilation', &
	1435	& ' Background state is taken from model rather than background file' )
	1436	trn(:,:,:,jp_msa0:jp_msa1) = trn(:,:,:,jp_msa0:jp_msa1) + &
	1437	& logchl_balinc(:,:,:,jp_msa0:jp_msa1)
	1438	trb(:,:,:,jp_msa0:jp_msa1) = trn(:,:,:,jp_msa0:jp_msa1)
	1439	#elif defined key_hadocc
	1440	! Initialize the now fields with the background + increment
	1441	! Background currently is what the model is initialised with
	1442	CALL ctl_warn( ' Doing direct initialisation of HadOCC with chlorophyll assimilation', &
	1443	& ' Background state is taken from model rather than background file' )
	1444	trn(:,:,:,jp_had0:jp_had1) = trn(:,:,:,jp_had0:jp_had1) + &
	1445	& logchl_balinc(:,:,:,jp_had0:jp_had1)
	1446	trb(:,:,:,jp_had0:jp_had1) = trn(:,:,:,jp_had0:jp_had1)
	1447	#endif
	1448
	1449	! Do not deallocate arrays - needed by asm_bal_wri
	1450	! which is called at end of model run
	1451	ENDIF
	1452	!
	1453	ENDIF
	1454	!
	1455	END SUBROUTINE logchl_asm_inc
[3785]	1456
[2392]	1457	!!======================================================================
[2128]	1458	END MODULE asminc

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