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asminc.F90 in branches/UKMO/dev5518_gulf18_changes/NEMOGCM/NEMO/OPA_SRC/ASM – NEMO

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source: branches/UKMO/dev5518_gulf18_changes/NEMOGCM/NEMO/OPA_SRC/ASM/asminc.F90 @ 14034

Last change on this file since 14034 was 14034, checked in by jwhile, 3 years ago
Updates to asminc
File size: 65.8 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
[12611]	23	!! seaice_asm_inc : Apply the sea ice concentration increment
	24	!! sit_asm_inc : Apply the sea ice thickness 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
	42	USE sbc_oce ! Surface boundary condition variables.
[9181]	43	USE zdfmxl, ONLY : &
	44	& hmld_tref, &
	45	#if defined key_karaml
	46	& hmld_kara, &
	47	& ln_kara, &
	48	#endif
	49	& hmld, &
	50	& hmlp, &
	51	& hmlpt
	52	#if defined key_bdy
	53	USE bdy_oce, ONLY: bdytmask
	54	#endif
[10728]	55	USE asmbgc ! Biogeochemistry assimilation
[2128]	56
	57	IMPLICIT NONE
	58	PRIVATE
[2392]	59
	60	PUBLIC asm_inc_init !: Initialize the increment arrays and IAU weights
	61	PUBLIC calc_date !: Compute the calendar date YYYYMMDD on a given step
	62	PUBLIC tra_asm_inc !: Apply the tracer (T and S) increments
	63	PUBLIC dyn_asm_inc !: Apply the dynamic (u and v) increments
	64	PUBLIC ssh_asm_inc !: Apply the SSH increment
[12611]	65	PUBLIC seaice_asm_inc !: Apply the seaice concentration increment
	66	PUBLIC sit_asm_inc !: Apply the seaice thickness increment
[10728]	67	PUBLIC bgc_asm_inc !: Apply the biogeochemistry increments
[2128]	68
	69	#if defined key_asminc
[2392]	70	LOGICAL, PUBLIC, PARAMETER :: lk_asminc = .TRUE. !: Logical switch for assimilation increment interface
[2128]	71	#else
[2392]	72	LOGICAL, PUBLIC, PARAMETER :: lk_asminc = .FALSE. !: No assimilation increments
[2128]	73	#endif
[4998]	74	LOGICAL, PUBLIC :: ln_bkgwri = .FALSE. !: No output of the background state fields
[9180]	75	LOGICAL, PUBLIC :: ln_avgbkg = .FALSE. !: No output of the mean background state fields
[4998]	76	LOGICAL, PUBLIC :: ln_asmiau = .FALSE. !: No applying forcing with an assimilation increment
	77	LOGICAL, PUBLIC :: ln_asmdin = .FALSE. !: No direct initialization
	78	LOGICAL, PUBLIC :: ln_trainc = .FALSE. !: No tracer (T and S) assimilation increments
	79	LOGICAL, PUBLIC :: ln_dyninc = .FALSE. !: No dynamics (u and v) assimilation increments
	80	LOGICAL, PUBLIC :: ln_sshinc = .FALSE. !: No sea surface height assimilation increment
[12611]	81	LOGICAL, PUBLIC :: ln_seaiceinc = .FALSE. !: No sea ice concentration increment
	82	LOGICAL, PUBLIC :: ln_sitinc = .FALSE. !: No sea ice thickness increment
[10728]	83	LOGICAL, PUBLIC :: lk_bgcinc = .FALSE. !: No biogeochemistry increments
[4998]	84	LOGICAL, PUBLIC :: ln_salfix = .FALSE. !: Apply minimum salinity check
[3764]	85	LOGICAL, PUBLIC :: ln_temnofreeze = .FALSE. !: Don't allow the temperature to drop below freezing
[4998]	86	INTEGER, PUBLIC :: nn_divdmp !: Apply divergence damping filter nn_divdmp times
[2128]	87
[2392]	88	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: t_bkg , s_bkg !: Background temperature and salinity
	89	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: u_bkg , v_bkg !: Background u- & v- velocity components
	90	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: t_bkginc, s_bkginc !: Increment to the background T & S
	91	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: u_bkginc, v_bkginc !: Increment to the u- & v-components
	92	REAL(wp), PUBLIC, DIMENSION(:) , ALLOCATABLE :: wgtiau !: IAU weights for each time step
[2128]	93	#if defined key_asminc
[2392]	94	REAL(wp), PUBLIC, DIMENSION(:,:), ALLOCATABLE :: ssh_iau !: IAU-weighted sea surface height increment
[2128]	95	#endif
[2392]	96	! !!! time steps relative to the cycle interval [0,nitend-nit000-1]
	97	INTEGER , PUBLIC :: nitbkg !: Time step of the background state used in the Jb term
	98	INTEGER , PUBLIC :: nitdin !: Time step of the background state for direct initialization
	99	INTEGER , PUBLIC :: nitiaustr !: Time step of the start of the IAU interval
	100	INTEGER , PUBLIC :: nitiaufin !: Time step of the end of the IAU interval
[9180]	101	INTEGER , PUBLIC :: nitavgbkg !: Number of timesteps to average assim bkg [0,nitavgbkg]
[2392]	102	!
	103	INTEGER , PUBLIC :: niaufn !: Type of IAU weighing function: = 0 Constant weighting
	104	! !: = 1 Linear hat-like, centred in middle of IAU interval
	105	REAL(wp), PUBLIC :: salfixmin !: Ensure that the salinity is larger than this value if (ln_salfix)
[2128]	106
[2392]	107	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ssh_bkg, ssh_bkginc ! Background sea surface height and its increment
[3764]	108	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: seaice_bkginc ! Increment to the background sea ice conc
[2128]	109
[9181]	110	INTEGER :: mld_choice = 4 !: choice of mld criteria to use for physics assimilation
	111	!: 1) hmld - Turbocline/mixing depth [W points]
	112	!: 2) hmlp - Density criterion (0.01 kg/m^3 change from 10m) [W points]
	113	!: 3) hmld_kara - Kara MLD [Interpolated]
	114	!: 4) hmld_tref - Temperature criterion (0.2 K change from surface) [T points]
	115
	116
[3294]	117	!! * Substitutions
	118	# include "domzgr_substitute.h90"
	119	# include "ldfdyn_substitute.h90"
	120	# include "vectopt_loop_substitute.h90"
[2287]	121	!!----------------------------------------------------------------------
	122	!! NEMO/OPA 3.3 , NEMO Consortium (2010)
	123	!! $Id$
[2392]	124	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[2287]	125	!!----------------------------------------------------------------------
[2128]	126	CONTAINS
	127
	128	SUBROUTINE asm_inc_init
	129	!!----------------------------------------------------------------------
	130	!! * ROUTINE asm_inc_init *
	131	!!
	132	!! ** Purpose : Initialize the assimilation increment and IAU weights.
	133	!!
	134	!! ** Method : Initialize the assimilation increment and IAU weights.
	135	!!
	136	!! ** Action :
	137	!!----------------------------------------------------------------------
[4990]	138	INTEGER :: ji, jj, jk, jt ! dummy loop indices
	139	INTEGER :: imid, inum ! local integers
	140	INTEGER :: ios ! Local integer output status for namelist read
[2128]	141	INTEGER :: iiauper ! Number of time steps in the IAU period
	142	INTEGER :: icycper ! Number of time steps in the cycle
	143	INTEGER :: iitend_date ! Date YYYYMMDD of final time step
	144	INTEGER :: iitbkg_date ! Date YYYYMMDD of background time step for Jb term
	145	INTEGER :: iitdin_date ! Date YYYYMMDD of background time step for DI
	146	INTEGER :: iitiaustr_date ! Date YYYYMMDD of IAU interval start time step
	147	INTEGER :: iitiaufin_date ! Date YYYYMMDD of IAU interval final time step
[9181]	148	INTEGER :: isurfstat ! Local integer for status of reading surft variable
[9180]	149	INTEGER :: iitavgbkg_date ! Date YYYYMMDD of end of assim bkg averaging period
[4990]	150	!
[2128]	151	REAL(wp) :: znorm ! Normalization factor for IAU weights
[4990]	152	REAL(wp) :: ztotwgt ! Value of time-integrated IAU weights (should be equal to one)
[2128]	153	REAL(wp) :: z_inc_dateb ! Start date of interval on which increment is valid
	154	REAL(wp) :: z_inc_datef ! End date of interval on which increment is valid
	155	REAL(wp) :: zdate_bkg ! Date in background state file for DI
	156	REAL(wp) :: zdate_inc ! Time axis in increments file
[4990]	157	!
[9181]	158	REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: &
	159	& t_bkginc_2d ! file for reading in 2D
	160	! ! temperature increments
	161	REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: &
	162	& z_mld ! Mixed layer depth
	163
[4990]	164	REAL(wp), POINTER, DIMENSION(:,:) :: hdiv ! 2D workspace
[9181]	165	!
	166	LOGICAL :: lk_surft ! Logical: T => Increments file contains surft variable
	167	! so only apply surft increments.
[14034]	168	CHARACTER(50) :: cn_surftname ! Name of the surft variable in the increments file
[2392]	169	!!
[10728]	170	NAMELIST/nam_asminc/ ln_bkgwri, ln_avgbkg, ln_balwri, &
[2392]	171	& ln_trainc, ln_dyninc, ln_sshinc, &
[10728]	172	& ln_phytobal, ln_slchltotinc, ln_slchldiainc, &
	173	& ln_slchlnaninc, ln_slchlpicinc, ln_slchldininc, &
	174	& ln_slchlnoninc, ln_schltotinc, ln_slphytotinc, &
	175	& ln_slphydiainc, ln_slphynoninc, ln_spco2inc, &
	176	& ln_sfco2inc, ln_plchltotinc, ln_pchltotinc, &
[13318]	177	& ln_plchldiainc, ln_plchlnaninc, ln_plchlpicinc, &
	178	& ln_plchldininc, &
[10728]	179	& ln_pno3inc, ln_psi4inc, ln_pdicinc, ln_palkinc, &
	180	& ln_pphinc, ln_po2inc, ln_ppo4inc, &
[2392]	181	& ln_asmdin, ln_asmiau, &
	182	& nitbkg, nitdin, nitiaustr, nitiaufin, niaufn, &
[10728]	183	& ln_salfix, salfixmin, nn_divdmp, nitavgbkg, &
[14034]	184	& mld_choice, mld_choice_bgc, rn_maxchlinc, &
	185	& cn_surftname
	186
[2392]	187	!!----------------------------------------------------------------------
[2128]	188
	189	!-----------------------------------------------------------------------
	190	! Read Namelist nam_asminc : assimilation increment interface
	191	!-----------------------------------------------------------------------
[9180]	192
	193	! Set default values
	194	ln_bkgwri = .FALSE.
	195	ln_avgbkg = .FALSE.
	196	ln_trainc = .FALSE.
	197	ln_dyninc = .FALSE.
	198	ln_sshinc = .FALSE.
	199	ln_asmdin = .FALSE.
	200	ln_asmiau = .TRUE.
	201	ln_salfix = .FALSE.
[12611]	202
	203	ln_seaiceinc = .FALSE.
	204	ln_sitinc = .FALSE.
[3764]	205	ln_temnofreeze = .FALSE.
[12611]	206
[9180]	207	salfixmin = -9999
	208	nitbkg = 0
	209	nitdin = 0
	210	nitiaustr = 1
	211	nitiaufin = 150
	212	niaufn = 0
	213	nitavgbkg = 1
[14034]	214	cn_surftname = "surft"
[2128]	215
[4147]	216	REWIND( numnam_ref ) ! Namelist nam_asminc in reference namelist : Assimilation increment
	217	READ ( numnam_ref, nam_asminc, IOSTAT = ios, ERR = 901)
	218	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nam_asminc in reference namelist', lwp )
[2128]	219
[4147]	220	REWIND( numnam_cfg ) ! Namelist nam_asminc in configuration namelist : Assimilation increment
	221	READ ( numnam_cfg, nam_asminc, IOSTAT = ios, ERR = 902 )
	222	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nam_asminc in configuration namelist', lwp )
[4624]	223	IF(lwm) WRITE ( numond, nam_asminc )
[4147]	224
[2128]	225	! Control print
	226	IF(lwp) THEN
	227	WRITE(numout,*)
	228	WRITE(numout,*) 'asm_inc_init : Assimilation increment initialization :'
	229	WRITE(numout,*) '~~~~~~~~~~~~'
[10728]	230	WRITE(numout,*) ' Namelist nam_asminc : set assimilation increment parameters'
[2392]	231	WRITE(numout,*) ' Logical switch for writing out background state ln_bkgwri = ', ln_bkgwri
[9180]	232	WRITE(numout,*) ' Logical switch for writing mean background state ln_avgbkg = ', ln_avgbkg
[10728]	233	WRITE(numout,*) ' Logical switch for writing out balancing increments ln_balwri = ', ln_balwri
[2392]	234	WRITE(numout,*) ' Logical switch for applying tracer increments ln_trainc = ', ln_trainc
	235	WRITE(numout,*) ' Logical switch for applying velocity increments ln_dyninc = ', ln_dyninc
	236	WRITE(numout,*) ' Logical switch for applying SSH increments ln_sshinc = ', ln_sshinc
[12611]	237	WRITE(numout,*) ' Logical switch for applying SIC increments ln_seaiceinc = ', ln_seaiceinc
	238	WRITE(numout,*) ' Logical switch for applying SIT increments ln_sitinc = ', ln_sitinc
[2392]	239	WRITE(numout,*) ' Logical switch for Direct Initialization (DI) ln_asmdin = ', ln_asmdin
	240	WRITE(numout,*) ' Logical switch for Incremental Analysis Updating (IAU) ln_asmiau = ', ln_asmiau
	241	WRITE(numout,*) ' Timestep of background in [0,nitend-nit000-1] nitbkg = ', nitbkg
	242	WRITE(numout,*) ' Timestep of background for DI in [0,nitend-nit000-1] nitdin = ', nitdin
	243	WRITE(numout,*) ' Timestep of start of IAU interval in [0,nitend-nit000-1] nitiaustr = ', nitiaustr
	244	WRITE(numout,*) ' Timestep of end of IAU interval in [0,nitend-nit000-1] nitiaufin = ', nitiaufin
[9180]	245	WRITE(numout,*) ' Number of timesteps to average assim bkg [0,nitavgbkg] nitavgbkg = ', nitavgbkg
[2392]	246	WRITE(numout,*) ' Type of IAU weighting function niaufn = ', niaufn
	247	WRITE(numout,*) ' Logical switch for ensuring that the sa > salfixmin ln_salfix = ', ln_salfix
	248	WRITE(numout,*) ' Minimum salinity after applying the increments salfixmin = ', salfixmin
[9181]	249	WRITE(numout,*) ' Choice of MLD for physics assimilation mld_choice = ', mld_choice
[10728]	250	WRITE(numout,*) ' Choice of MLD for BGC assimilation mld_choice_bgc = ', mld_choice_bgc
	251	WRITE(numout,*) ' Maximum absolute chlorophyll increment (<=0 = off) rn_maxchlinc = ', rn_maxchlinc
[12611]	252	WRITE(numout,*) ' Logical switch for phytoplankton balancing ln_phytobal = ', ln_phytobal
	253	WRITE(numout,*) ' Logical switch for applying slchltot increments ln_slchltotinc = ', ln_slchltotinc
	254	WRITE(numout,*) ' Logical switch for applying slchldia increments ln_slchldiainc = ', ln_slchldiainc
	255	WRITE(numout,*) ' Logical switch for applying slchlnon increments ln_slchlnoninc = ', ln_slchlnoninc
	256	WRITE(numout,*) ' Logical switch for applying slchlnan increments ln_slchlnaninc = ', ln_slchlnaninc
	257	WRITE(numout,*) ' Logical switch for applying slchlpic increments ln_slchlpicinc = ', ln_slchlpicinc
	258	WRITE(numout,*) ' Logical switch for applying slchldin increments ln_slchldininc = ', ln_slchldininc
	259	WRITE(numout,*) ' Logical switch for applying schltot increments ln_schltotinc = ', ln_schltotinc
	260	WRITE(numout,*) ' Logical switch for applying slphytot increments ln_slphytotinc = ', ln_slphytotinc
	261	WRITE(numout,*) ' Logical switch for applying slphydia increments ln_slphydiainc = ', ln_slphydiainc
	262	WRITE(numout,*) ' Logical switch for applying slphynon increments ln_slphynoninc = ', ln_slphynoninc
	263	WRITE(numout,*) ' Logical switch for applying spco2 increments ln_spco2inc = ', ln_spco2inc
	264	WRITE(numout,*) ' Logical switch for applying sfco2 increments ln_sfco2inc = ', ln_sfco2inc
	265	WRITE(numout,*) ' Logical switch for applying plchltot increments ln_plchltotinc = ', ln_plchltotinc
	266	WRITE(numout,*) ' Logical switch for applying pchltot increments ln_pchltotinc = ', ln_pchltotinc
[13318]	267	WRITE(numout,*) ' Logical switch for applying plchldia increments ln_plchldiainc = ', ln_plchldiainc
	268	WRITE(numout,*) ' Logical switch for applying plchlnan increments ln_plchlnaninc = ', ln_plchlnaninc
	269	WRITE(numout,*) ' Logical switch for applying plchlpic increments ln_plchlpicinc = ', ln_plchlpicinc
	270	WRITE(numout,*) ' Logical switch for applying plchldin increments ln_plchldininc = ', ln_plchldininc
[12611]	271	WRITE(numout,*) ' Logical switch for applying pno3 increments ln_pno3inc = ', ln_pno3inc
	272	WRITE(numout,*) ' Logical switch for applying psi4 increments ln_psi4inc = ', ln_psi4inc
	273	WRITE(numout,*) ' Logical switch for applying ppo4 increments ln_ppo4inc = ', ln_ppo4inc
	274	WRITE(numout,*) ' Logical switch for applying pdic increments ln_pdicinc = ', ln_pdicinc
	275	WRITE(numout,*) ' Logical switch for applying palk increments ln_palkinc = ', ln_palkinc
	276	WRITE(numout,*) ' Logical switch for applying pph increments ln_pphinc = ', ln_pphinc
	277	WRITE(numout,*) ' Logical switch for applying po2 increments ln_po2inc = ', ln_po2inc
[14034]	278	WRITE(numout,*) ' Surface temperature variable name (if applicable) cn_surftname = ', cn_surftname
[2128]	279	ENDIF
	280
	281	nitbkg_r = nitbkg + nit000 - 1 ! Background time referenced to nit000
	282	nitdin_r = nitdin + nit000 - 1 ! Background time for DI referenced to nit000
	283	nitiaustr_r = nitiaustr + nit000 - 1 ! Start of IAU interval referenced to nit000
	284	nitiaufin_r = nitiaufin + nit000 - 1 ! End of IAU interval referenced to nit000
[9180]	285	nitavgbkg_r = nitavgbkg + nit000 - 1 ! Averaging period referenced to nit000
[2128]	286
	287	iiauper = nitiaufin_r - nitiaustr_r + 1 ! IAU interval length
	288	icycper = nitend - nit000 + 1 ! Cycle interval length
	289
[4990]	290	CALL calc_date( nit000, nitend , ndate0, iitend_date ) ! Date of final time step
	291	CALL calc_date( nit000, nitbkg_r , ndate0, iitbkg_date ) ! Background time for Jb referenced to ndate0
	292	CALL calc_date( nit000, nitdin_r , ndate0, iitdin_date ) ! Background time for DI referenced to ndate0
	293	CALL calc_date( nit000, nitiaustr_r, ndate0, iitiaustr_date ) ! IAU start time referenced to ndate0
	294	CALL calc_date( nit000, nitiaufin_r, ndate0, iitiaufin_date ) ! IAU end time referenced to ndate0
[9180]	295	CALL calc_date( nit000, nitavgbkg_r, ndate0, iitavgbkg_date ) ! End of assim bkg averaging period referenced to ndate0
[4990]	296	!
[2128]	297	IF(lwp) THEN
	298	WRITE(numout,*)
	299	WRITE(numout,*) ' Time steps referenced to current cycle:'
	300	WRITE(numout,*) ' iitrst = ', nit000 - 1
	301	WRITE(numout,*) ' nit000 = ', nit000
	302	WRITE(numout,*) ' nitend = ', nitend
	303	WRITE(numout,*) ' nitbkg_r = ', nitbkg_r
	304	WRITE(numout,*) ' nitdin_r = ', nitdin_r
	305	WRITE(numout,*) ' nitiaustr_r = ', nitiaustr_r
	306	WRITE(numout,*) ' nitiaufin_r = ', nitiaufin_r
[9180]	307	WRITE(numout,*) ' nitavgbkg_r = ', nitavgbkg_r
[2128]	308	WRITE(numout,*)
	309	WRITE(numout,*) ' Dates referenced to current cycle:'
	310	WRITE(numout,*) ' ndastp = ', ndastp
	311	WRITE(numout,*) ' ndate0 = ', ndate0
	312	WRITE(numout,*) ' iitend_date = ', iitend_date
	313	WRITE(numout,*) ' iitbkg_date = ', iitbkg_date
	314	WRITE(numout,*) ' iitdin_date = ', iitdin_date
	315	WRITE(numout,*) ' iitiaustr_date = ', iitiaustr_date
	316	WRITE(numout,*) ' iitiaufin_date = ', iitiaufin_date
[9180]	317	WRITE(numout,*) ' iitavgbkg_date = ', iitavgbkg_date
[2128]	318	ENDIF
[10728]	319	IF ( ln_slchltotinc .OR. ln_slchldiainc .OR. ln_slchlnoninc .OR. &
	320	& ln_slchlnaninc .OR. ln_slchlpicinc .OR. ln_slchldininc .OR. &
	321	& ln_schltotinc .OR. ln_slphytotinc .OR. ln_slphydiainc .OR. &
	322	& ln_slphynoninc .OR. ln_spco2inc .OR. ln_sfco2inc .OR. &
[13318]	323	& ln_plchltotinc .OR. ln_pchltotinc .OR. ln_plchldiainc .OR. &
	324	& ln_plchlnaninc .OR. ln_plchlpicinc .OR. ln_plchldininc .OR. &
	325	& ln_pno3inc .OR. &
[10728]	326	& ln_psi4inc .OR. ln_pdicinc .OR. ln_palkinc .OR. &
	327	& ln_pphinc .OR. ln_po2inc .OR. ln_ppo4inc ) THEN
	328	lk_bgcinc = .TRUE.
	329	ENDIF
[2128]	330
	331	IF ( nacc /= 0 ) &
	332	& CALL ctl_stop( ' nacc /= 0 and key_asminc :', &
	333	& ' Assimilation increments have only been implemented', &
	334	& ' for synchronous time stepping' )
	335
	336	IF ( ( ln_asmdin ).AND.( ln_asmiau ) ) &
	337	& CALL ctl_stop( ' ln_asmdin and ln_asmiau :', &
	338	& ' Choose Direct Initialization OR Incremental Analysis Updating')
	339
	340	IF ( ( ( .NOT. ln_asmdin ).AND.( .NOT. ln_asmiau ) ) &
[10728]	341	& .AND.( ( ln_trainc ).OR.( ln_dyninc ).OR.( ln_sshinc ).OR.( ln_seaiceinc ).OR. &
[12611]	342	& ( ln_sitinc ).OR.( lk_bgcinc ) )) &
[10728]	343	& CALL ctl_stop( ' One or more of ln_trainc, ln_dyninc, ln_sshinc, ln_seaiceinc,', &
[12611]	344	& ' ln_sitinc and ln_(bgc-variable)inc is set to .true.', &
[2128]	345	& ' but ln_asmdin and ln_asmiau are both set to .false. :', &
	346	& ' Inconsistent options')
	347
	348	IF ( ( niaufn /= 0 ).AND.( niaufn /= 1 ) ) &
	349	& CALL ctl_stop( ' niaufn /= 0 or niaufn /=1 :', &
	350	& ' Type IAU weighting function is invalid')
	351
[3764]	352	IF ( ( .NOT. ln_trainc ).AND.( .NOT. ln_dyninc ).AND.( .NOT. ln_sshinc ).AND.( .NOT. ln_seaiceinc ) &
[12611]	353	& .AND.( .NOT. ln_sitinc ).AND.( .NOT. lk_bgcinc ) ) &
[10728]	354	& CALL ctl_warn( ' ln_trainc, ln_dyninc, ln_sshinc, ln_seaiceinc,', &
[12611]	355	& ' ln_sitinc and ln_(bgc-variable)inc are set to .false. :', &
[2128]	356	& ' The assimilation increments are not applied')
	357
	358	IF ( ( ln_asmiau ).AND.( nitiaustr == nitiaufin ) ) &
	359	& CALL ctl_stop( ' nitiaustr = nitiaufin :', &
	360	& ' IAU interval is of zero length')
	361
	362	IF ( ( ln_asmiau ).AND.( ( nitiaustr_r < nit000 ).OR.( nitiaufin_r > nitend ) ) ) &
	363	& CALL ctl_stop( ' nitiaustr or nitiaufin :', &
	364	& ' IAU starting or final time step is outside the cycle interval', &
	365	& ' Valid range nit000 to nitend')
	366
	367	IF ( ( nitbkg_r < nit000 - 1 ).OR.( nitbkg_r > nitend ) ) &
	368	& CALL ctl_stop( ' nitbkg :', &
	369	& ' Background time step is outside the cycle interval')
	370
	371	IF ( ( nitdin_r < nit000 - 1 ).OR.( nitdin_r > nitend ) ) &
	372	& CALL ctl_stop( ' nitdin :', &
	373	& ' Background time step for Direct Initialization is outside', &
	374	& ' the cycle interval')
	375
[9180]	376	IF ( nitavgbkg_r > nitend ) &
	377	& CALL ctl_stop( ' nitavgbkg_r :', &
	378	& ' Assim bkg averaging period is outside', &
	379	& ' the cycle interval')
[10728]	380
	381	IF ( lk_bgcinc ) CALL asm_bgc_check_options
[9180]	382
[2128]	383	IF ( nstop > 0 ) RETURN ! if there are any errors then go no further
	384
	385	!--------------------------------------------------------------------
	386	! Initialize the Incremental Analysis Updating weighting function
	387	!--------------------------------------------------------------------
	388
	389	IF ( ln_asmiau ) THEN
	390
	391	ALLOCATE( wgtiau( icycper ) )
	392
	393	wgtiau(:) = 0.0
	394
	395	IF ( niaufn == 0 ) THEN
	396
	397	!---------------------------------------------------------
	398	! Constant IAU forcing
	399	!---------------------------------------------------------
	400
	401	DO jt = 1, iiauper
	402	wgtiau(jt+nitiaustr-1) = 1.0 / REAL( iiauper )
	403	END DO
	404
	405	ELSEIF ( niaufn == 1 ) THEN
	406
	407	!---------------------------------------------------------
	408	! Linear hat-like, centred in middle of IAU interval
	409	!---------------------------------------------------------
	410
	411	! Compute the normalization factor
	412	znorm = 0.0
	413	IF ( MOD( iiauper, 2 ) == 0 ) THEN ! Even number of time steps in IAU interval
	414	imid = iiauper / 2
	415	DO jt = 1, imid
	416	znorm = znorm + REAL( jt )
	417	END DO
	418	znorm = 2.0 * znorm
	419	ELSE ! Odd number of time steps in IAU interval
	420	imid = ( iiauper + 1 ) / 2
	421	DO jt = 1, imid - 1
	422	znorm = znorm + REAL( jt )
	423	END DO
	424	znorm = 2.0 * znorm + REAL( imid )
	425	ENDIF
	426	znorm = 1.0 / znorm
	427
	428	DO jt = 1, imid - 1
	429	wgtiau(jt+nitiaustr-1) = REAL( jt ) * znorm
	430	END DO
	431	DO jt = imid, iiauper
	432	wgtiau(jt+nitiaustr-1) = REAL( iiauper - jt + 1 ) * znorm
	433	END DO
	434
	435	ENDIF
	436
	437	! Test that the integral of the weights over the weighting interval equals 1
	438	IF(lwp) THEN
	439	WRITE(numout,*)
	440	WRITE(numout,*) 'asm_inc_init : IAU weights'
	441	WRITE(numout,*) '~~~~~~~~~~~~'
	442	WRITE(numout,*) ' time step IAU weight'
	443	WRITE(numout,*) ' ========= ====================='
	444	ztotwgt = 0.0
	445	DO jt = 1, icycper
	446	ztotwgt = ztotwgt + wgtiau(jt)
	447	WRITE(numout,*) ' ', jt, ' ', wgtiau(jt)
	448	END DO
	449	WRITE(numout,*) ' ==================================='
	450	WRITE(numout,*) ' Time-integrated weight = ', ztotwgt
	451	WRITE(numout,*) ' ==================================='
	452	ENDIF
	453
	454	ENDIF
	455
	456	!--------------------------------------------------------------------
	457	! Allocate and initialize the increment arrays
	458	!--------------------------------------------------------------------
	459
[9181]	460	IF ( ln_trainc ) THEN
	461	ALLOCATE( t_bkginc(jpi,jpj,jpk) )
	462	ALLOCATE( s_bkginc(jpi,jpj,jpk) )
	463	t_bkginc(:,:,:) = 0.0
	464	s_bkginc(:,:,:) = 0.0
	465	ENDIF
	466	IF ( ln_dyninc ) THEN
	467	ALLOCATE( u_bkginc(jpi,jpj,jpk) )
	468	ALLOCATE( v_bkginc(jpi,jpj,jpk) )
	469	u_bkginc(:,:,:) = 0.0
	470	v_bkginc(:,:,:) = 0.0
	471	ENDIF
	472	IF ( ln_sshinc ) THEN
	473	ALLOCATE( ssh_bkginc(jpi,jpj) )
	474	ssh_bkginc(:,:) = 0.0
	475	ENDIF
	476	IF ( ln_seaiceinc ) THEN
	477	ALLOCATE( seaice_bkginc(jpi,jpj))
	478	seaice_bkginc(:,:) = 0.0
	479	ENDIF
[12611]	480	IF ( ln_sitinc ) THEN
	481	ALLOCATE( sit_bkginc(jpi,jpj))
	482	sit_bkginc(:,:) = 0.0
	483	ENDIF
[2128]	484	#if defined key_asminc
	485	ALLOCATE( ssh_iau(jpi,jpj) )
	486	ssh_iau(:,:) = 0.0
	487	#endif
[10728]	488	IF ( ( ln_trainc ).OR.( ln_dyninc ).OR.( ln_sshinc ).OR.( ln_seaiceinc ) &
[12611]	489	& .OR.( ln_sitinc ).OR.( lk_bgcinc ) ) THEN
[2128]	490
	491	!--------------------------------------------------------------------
	492	! Read the increments from file
	493	!--------------------------------------------------------------------
	494
	495	CALL iom_open( c_asminc, inum )
	496
	497	CALL iom_get( inum, 'time', zdate_inc )
	498
	499	CALL iom_get( inum, 'z_inc_dateb', z_inc_dateb )
	500	CALL iom_get( inum, 'z_inc_datef', z_inc_datef )
	501	z_inc_dateb = zdate_inc
	502	z_inc_datef = zdate_inc
	503
	504	IF(lwp) THEN
	505	WRITE(numout,*)
	506	WRITE(numout,*) 'asm_inc_init : Assimilation increments valid ', &
	507	& ' between dates ', NINT( z_inc_dateb ),' and ', &
	508	& NINT( z_inc_datef )
	509	WRITE(numout,*) '~~~~~~~~~~~~'
	510	ENDIF
	511
	512	IF ( ( NINT( z_inc_dateb ) < ndastp ) &
	513	& .OR.( NINT( z_inc_datef ) > iitend_date ) ) &
	514	& CALL ctl_warn( ' Validity time of assimilation increments is ', &
	515	& ' outside the assimilation interval' )
	516
	517	IF ( ( ln_asmdin ).AND.( NINT( zdate_inc ) /= iitdin_date ) ) &
	518	& CALL ctl_warn( ' Validity time of assimilation increments does ', &
	519	& ' not agree with Direct Initialization time' )
	520
	521	IF ( ln_trainc ) THEN
[9181]	522
	523	!Test if the increments file contains the surft variable.
[14034]	524	isurfstat = iom_varid( inum, 'bckin'//TRIM(cn_surftname), ldstop = .FALSE. )
[9181]	525	IF ( isurfstat == -1 ) THEN
	526	lk_surft = .FALSE.
	527	ELSE
	528	lk_surft = .TRUE.
	529	CALL ctl_warn( ' Applying 2D temperature increment to bottom of ML: ', &
[14034]	530	& ' bckin'//TRIM(cn_surftname)//' found in increments file.' )
[9181]	531	ENDIF
	532
	533	IF (lk_surft) THEN
	534
	535	ALLOCATE(z_mld(jpi,jpj))
	536	SELECT CASE(mld_choice)
	537	CASE(1)
	538	z_mld = hmld
	539	CASE(2)
	540	z_mld = hmlp
	541	CASE(3)
	542	#if defined key_karaml
	543	IF ( ln_kara ) THEN
	544	z_mld = hmld_kara
	545	ELSE
	546	CALL ctl_stop("Kara mixed layer not calculated as ln_kara=.false.")
	547	ENDIF
	548	#else
	549	CALL ctl_stop("Kara mixed layer not defined in current version of NEMO") ! JW: Safety feature, should be removed
	550	! once the Kara mixed layer is available
	551	#endif
	552	CASE(4)
	553	z_mld = hmld_tref
	554	END SELECT
	555
	556	ALLOCATE( t_bkginc_2d(jpi,jpj) )
[14034]	557	CALL iom_get( inum, jpdom_autoglo, 'bckin'//TRIM(cn_surftname), t_bkginc_2d, 1)
[9181]	558	#if defined key_bdy
	559	DO jk = 1,jpkm1
	560	WHERE( z_mld(:,:) > fsdepw(:,:,jk) )
	561	t_bkginc(:,:,jk) = t_bkginc_2d(:,:) * 0.5 * &
	562	& ( 1 + cos( (fsdept(:,:,jk)/z_mld(:,:) ) * rpi ) )
	563
	564	t_bkginc(:,:,jk) = t_bkginc(:,:,jk) * bdytmask(:,:)
	565	ELSEWHERE
	566	t_bkginc(:,:,jk) = 0.
	567	ENDWHERE
	568	ENDDO
	569	#else
	570	t_bkginc(:,:,:) = 0.
	571	#endif
	572	s_bkginc(:,:,:) = 0.
	573
	574	DEALLOCATE(z_mld, t_bkginc_2d)
	575
	576	ELSE
	577
	578	CALL iom_get( inum, jpdom_autoglo, 'bckint', t_bkginc, 1 )
	579	CALL iom_get( inum, jpdom_autoglo, 'bckins', s_bkginc, 1 )
	580	! Apply the masks
	581	t_bkginc(:,:,:) = t_bkginc(:,:,:) * tmask(:,:,:)
	582	s_bkginc(:,:,:) = s_bkginc(:,:,:) * tmask(:,:,:)
	583	! Set missing increments to 0.0 rather than 1e+20
	584	! to allow for differences in masks
	585	WHERE( ABS( t_bkginc(:,:,:) ) > 1.0e+10 ) t_bkginc(:,:,:) = 0.0
	586	WHERE( ABS( s_bkginc(:,:,:) ) > 1.0e+10 ) s_bkginc(:,:,:) = 0.0
	587
	588	ENDIF
	589
[2128]	590	ENDIF
	591
	592	IF ( ln_dyninc ) THEN
	593	CALL iom_get( inum, jpdom_autoglo, 'bckinu', u_bkginc, 1 )
	594	CALL iom_get( inum, jpdom_autoglo, 'bckinv', v_bkginc, 1 )
	595	! Apply the masks
	596	u_bkginc(:,:,:) = u_bkginc(:,:,:) * umask(:,:,:)
	597	v_bkginc(:,:,:) = v_bkginc(:,:,:) * vmask(:,:,:)
	598	! Set missing increments to 0.0 rather than 1e+20
	599	! to allow for differences in masks
	600	WHERE( ABS( u_bkginc(:,:,:) ) > 1.0e+10 ) u_bkginc(:,:,:) = 0.0
	601	WHERE( ABS( v_bkginc(:,:,:) ) > 1.0e+10 ) v_bkginc(:,:,:) = 0.0
	602	ENDIF
	603
	604	IF ( ln_sshinc ) THEN
	605	CALL iom_get( inum, jpdom_autoglo, 'bckineta', ssh_bkginc, 1 )
	606	! Apply the masks
	607	ssh_bkginc(:,:) = ssh_bkginc(:,:) * tmask(:,:,1)
	608	! Set missing increments to 0.0 rather than 1e+20
	609	! to allow for differences in masks
	610	WHERE( ABS( ssh_bkginc(:,:) ) > 1.0e+10 ) ssh_bkginc(:,:) = 0.0
	611	ENDIF
	612
[3764]	613	IF ( ln_seaiceinc ) THEN
	614	CALL iom_get( inum, jpdom_autoglo, 'bckinseaice', seaice_bkginc, 1 )
	615	! Apply the masks
	616	seaice_bkginc(:,:) = seaice_bkginc(:,:) * tmask(:,:,1)
	617	! Set missing increments to 0.0 rather than 1e+20
	618	! to allow for differences in masks
	619	WHERE( ABS( seaice_bkginc(:,:) ) > 1.0e+10 ) seaice_bkginc(:,:) = 0.0
	620	ENDIF
	621
[10728]	622	IF ( lk_bgcinc ) THEN
	623	CALL asm_bgc_init_incs( inum )
	624	ENDIF
	625
[2128]	626	CALL iom_close( inum )
	627
	628	ENDIF
	629
	630	!-----------------------------------------------------------------------
[3294]	631	! Apply divergence damping filter
	632	!-----------------------------------------------------------------------
	633
	634	IF ( ln_dyninc .AND. nn_divdmp > 0 ) THEN
	635
[3764]	636	CALL wrk_alloc(jpi,jpj,hdiv)
[3294]	637
[3764]	638	DO jt = 1, nn_divdmp
[3294]	639
[3764]	640	DO jk = 1, jpkm1
[3294]	641
[3764]	642	hdiv(:,:) = 0._wp
[3294]	643
[3764]	644	DO jj = 2, jpjm1
	645	DO ji = fs_2, fs_jpim1 ! vector opt.
	646	hdiv(ji,jj) = &
	647	( e2u(ji ,jj ) * fse3u(ji ,jj ,jk) * u_bkginc(ji ,jj ,jk) &
	648	- e2u(ji-1,jj ) * fse3u(ji-1,jj ,jk) * u_bkginc(ji-1,jj ,jk) &
	649	+ e1v(ji ,jj ) * fse3v(ji ,jj ,jk) * v_bkginc(ji ,jj ,jk) &
	650	- e1v(ji ,jj-1) * fse3v(ji ,jj-1,jk) * v_bkginc(ji ,jj-1,jk) ) &
	651	/ ( e1t(ji,jj) * e2t(ji,jj) * fse3t(ji,jj,jk) )
	652	END DO
[3294]	653	END DO
	654
[3764]	655	CALL lbc_lnk( hdiv, 'T', 1. ) ! lateral boundary cond. (no sign change)
[3294]	656
[3764]	657	DO jj = 2, jpjm1
	658	DO ji = fs_2, fs_jpim1 ! vector opt.
	659	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) &
	660	- e1t(ji ,jj)e2t(ji ,jj) hdiv(ji ,jj) ) &
	661	/ e1u(ji,jj) * umask(ji,jj,jk)
	662	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) &
	663	- e1t(ji,jj )e2t(ji,jj ) hdiv(ji,jj ) ) &
	664	/ e2v(ji,jj) * vmask(ji,jj,jk)
	665	END DO
[3294]	666	END DO
[3764]	667
[3294]	668	END DO
	669
[3764]	670	END DO
[3294]	671
[3764]	672	CALL wrk_dealloc(jpi,jpj,hdiv)
[3294]	673
	674	ENDIF
	675
	676
	677
	678	!-----------------------------------------------------------------------
[2128]	679	! Allocate and initialize the background state arrays
	680	!-----------------------------------------------------------------------
	681
	682	IF ( ln_asmdin ) THEN
	683
	684	ALLOCATE( t_bkg(jpi,jpj,jpk) )
	685	ALLOCATE( s_bkg(jpi,jpj,jpk) )
	686	ALLOCATE( u_bkg(jpi,jpj,jpk) )
	687	ALLOCATE( v_bkg(jpi,jpj,jpk) )
	688	ALLOCATE( ssh_bkg(jpi,jpj) )
	689
	690	t_bkg(:,:,:) = 0.0
	691	s_bkg(:,:,:) = 0.0
	692	u_bkg(:,:,:) = 0.0
	693	v_bkg(:,:,:) = 0.0
	694	ssh_bkg(:,:) = 0.0
	695
	696	!--------------------------------------------------------------------
	697	! Read from file the background state at analysis time
	698	!--------------------------------------------------------------------
	699
	700	CALL iom_open( c_asmdin, inum )
	701
[3764]	702	CALL iom_get( inum, 'rdastp', zdate_bkg )
[2128]	703
	704	IF(lwp) THEN
	705	WRITE(numout,*)
	706	WRITE(numout,*) 'asm_inc_init : Assimilation background state valid at : ', &
	707	& NINT( zdate_bkg )
	708	WRITE(numout,*) '~~~~~~~~~~~~'
	709	ENDIF
	710
	711	IF ( NINT( zdate_bkg ) /= iitdin_date ) &
	712	& CALL ctl_warn( ' Validity time of assimilation background state does', &
	713	& ' not agree with Direct Initialization time' )
	714
	715	IF ( ln_trainc ) THEN
	716	CALL iom_get( inum, jpdom_autoglo, 'tn', t_bkg )
	717	CALL iom_get( inum, jpdom_autoglo, 'sn', s_bkg )
	718	t_bkg(:,:,:) = t_bkg(:,:,:) * tmask(:,:,:)
	719	s_bkg(:,:,:) = s_bkg(:,:,:) * tmask(:,:,:)
	720	ENDIF
	721
	722	IF ( ln_dyninc ) THEN
	723	CALL iom_get( inum, jpdom_autoglo, 'un', u_bkg )
	724	CALL iom_get( inum, jpdom_autoglo, 'vn', v_bkg )
	725	u_bkg(:,:,:) = u_bkg(:,:,:) * umask(:,:,:)
	726	v_bkg(:,:,:) = v_bkg(:,:,:) * vmask(:,:,:)
	727	ENDIF
	728
	729	IF ( ln_sshinc ) THEN
	730	CALL iom_get( inum, jpdom_autoglo, 'sshn', ssh_bkg )
	731	ssh_bkg(:,:) = ssh_bkg(:,:) * tmask(:,:,1)
	732	ENDIF
	733
	734	CALL iom_close( inum )
	735
	736	ENDIF
[10728]	737
	738	IF ( lk_bgcinc ) THEN
	739	CALL asm_bgc_init_bkg
	740	ENDIF
[2392]	741	!
[2128]	742	END SUBROUTINE asm_inc_init
	743
[2392]	744
[2128]	745	SUBROUTINE calc_date( kit000, kt, kdate0, kdate )
	746	!!----------------------------------------------------------------------
	747	!! * ROUTINE calc_date *
	748	!!
	749	!! ** Purpose : Compute the calendar date YYYYMMDD at a given time step.
	750	!!
	751	!! ** Method : Compute the calendar date YYYYMMDD at a given time step.
	752	!!
	753	!! ** Action :
	754	!!----------------------------------------------------------------------
	755	INTEGER, INTENT(IN) :: kit000 ! Initial time step
	756	INTEGER, INTENT(IN) :: kt ! Current time step referenced to kit000
	757	INTEGER, INTENT(IN) :: kdate0 ! Initial date
	758	INTEGER, INTENT(OUT) :: kdate ! Current date reference to kdate0
[2392]	759	!
[2128]	760	INTEGER :: iyea0 ! Initial year
	761	INTEGER :: imon0 ! Initial month
	762	INTEGER :: iday0 ! Initial day
	763	INTEGER :: iyea ! Current year
	764	INTEGER :: imon ! Current month
	765	INTEGER :: iday ! Current day
	766	INTEGER :: idaystp ! Number of days between initial and current date
	767	INTEGER :: idaycnt ! Day counter
	768
	769	INTEGER, DIMENSION(12) :: imonth_len !: length in days of the months of the current year
	770
	771	!-----------------------------------------------------------------------
	772	! Compute the calendar date YYYYMMDD
	773	!-----------------------------------------------------------------------
	774
	775	! Initial date
	776	iyea0 = kdate0 / 10000
	777	imon0 = ( kdate0 - ( iyea0 * 10000 ) ) / 100
	778	iday0 = kdate0 - ( iyea0 * 10000 ) - ( imon0 * 100 )
	779
	780	! Check that kt >= kit000 - 1
	781	IF ( kt < kit000 - 1 ) CALL ctl_stop( ' kt must be >= kit000 - 1')
	782
	783	! If kt = kit000 - 1 then set the date to the restart date
	784	IF ( kt == kit000 - 1 ) THEN
	785
	786	kdate = ndastp
	787	RETURN
	788
	789	ENDIF
	790
	791	! Compute the number of days from the initial date
	792	idaystp = INT( REAL( kt - kit000 ) * rdt / 86400. )
	793
	794	iday = iday0
	795	imon = imon0
	796	iyea = iyea0
	797	idaycnt = 0
	798
	799	CALL calc_month_len( iyea, imonth_len )
	800
	801	DO WHILE ( idaycnt < idaystp )
	802	iday = iday + 1
	803	IF ( iday > imonth_len(imon) ) THEN
	804	iday = 1
	805	imon = imon + 1
	806	ENDIF
	807	IF ( imon > 12 ) THEN
	808	imon = 1
	809	iyea = iyea + 1
	810	CALL calc_month_len( iyea, imonth_len ) ! update month lengths
	811	ENDIF
	812	idaycnt = idaycnt + 1
	813	END DO
[2392]	814	!
[2128]	815	kdate = iyea * 10000 + imon * 100 + iday
[2392]	816	!
[2128]	817	END SUBROUTINE
	818
[2392]	819
[2128]	820	SUBROUTINE calc_month_len( iyear, imonth_len )
	821	!!----------------------------------------------------------------------
	822	!! * ROUTINE calc_month_len *
	823	!!
	824	!! ** Purpose : Compute the number of days in a months given a year.
	825	!!
	826	!! ** Method :
	827	!!----------------------------------------------------------------------
	828	INTEGER, DIMENSION(12) :: imonth_len !: length in days of the months of the current year
	829	INTEGER :: iyear !: year
[2392]	830	!!----------------------------------------------------------------------
	831	!
[2128]	832	! length of the month of the current year (from nleapy, read in namelist)
	833	IF ( nleapy < 2 ) THEN
	834	imonth_len(:) = (/ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 /)
	835	IF ( nleapy == 1 ) THEN ! we are using calendar with leap years
	836	IF ( MOD(iyear, 4) == 0 .AND. ( MOD(iyear, 400) == 0 .OR. MOD(iyear, 100) /= 0 ) ) THEN
	837	imonth_len(2) = 29
	838	ENDIF
	839	ENDIF
	840	ELSE
	841	imonth_len(:) = nleapy ! all months with nleapy days per year
	842	ENDIF
[2392]	843	!
[2128]	844	END SUBROUTINE
	845
[2392]	846
[2128]	847	SUBROUTINE tra_asm_inc( kt )
	848	!!----------------------------------------------------------------------
	849	!! * ROUTINE tra_asm_inc *
	850	!!
	851	!! ** Purpose : Apply the tracer (T and S) assimilation increments
	852	!!
	853	!! ** Method : Direct initialization or Incremental Analysis Updating
	854	!!
	855	!! ** Action :
	856	!!----------------------------------------------------------------------
	857	INTEGER, INTENT(IN) :: kt ! Current time step
[2392]	858	!
[2128]	859	INTEGER :: ji,jj,jk
	860	INTEGER :: it
	861	REAL(wp) :: zincwgt ! IAU weight for current time step
[3764]	862	REAL (wp), DIMENSION(jpi,jpj,jpk) :: fzptnz ! 3d freezing point values
[2392]	863	!!----------------------------------------------------------------------
[2128]	864
[3764]	865	! freezing point calculation taken from oc_fz_pt (but calculated for all depths)
	866	! used to prevent the applied increments taking the temperature below the local freezing point
	867
[4990]	868	DO jk = 1, jpkm1
[5540]	869	CALL eos_fzp( tsn(:,:,jk,jp_sal), fzptnz(:,:,jk), fsdept(:,:,jk) )
[4990]	870	END DO
[3764]	871
[2128]	872	IF ( ln_asmiau ) THEN
	873
	874	!--------------------------------------------------------------------
	875	! Incremental Analysis Updating
	876	!--------------------------------------------------------------------
	877
	878	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	879
	880	it = kt - nit000 + 1
	881	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
	882
	883	IF(lwp) THEN
	884	WRITE(numout,*)
[4990]	885	WRITE(numout,*) 'tra_asm_inc : Tracer IAU at time step = ', kt,' with IAU weight = ', wgtiau(it)
[2128]	886	WRITE(numout,*) '~~~~~~~~~~~~'
	887	ENDIF
	888
	889	! Update the tracer tendencies
	890	DO jk = 1, jpkm1
[3764]	891	IF (ln_temnofreeze) THEN
	892	! Do not apply negative increments if the temperature will fall below freezing
	893	WHERE(t_bkginc(:,:,jk) > 0.0_wp .OR. &
	894	& tsn(:,:,jk,jp_tem) + tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * wgtiau(it) > fzptnz(:,:,jk) )
	895	tsa(:,:,jk,jp_tem) = tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * zincwgt
	896	END WHERE
	897	ELSE
	898	tsa(:,:,jk,jp_tem) = tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * zincwgt
	899	ENDIF
	900	IF (ln_salfix) THEN
	901	! Do not apply negative increments if the salinity will fall below a specified
	902	! minimum value salfixmin
	903	WHERE(s_bkginc(:,:,jk) > 0.0_wp .OR. &
	904	& tsn(:,:,jk,jp_sal) + tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * wgtiau(it) > salfixmin )
	905	tsa(:,:,jk,jp_sal) = tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * zincwgt
	906	END WHERE
	907	ELSE
	908	tsa(:,:,jk,jp_sal) = tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * zincwgt
	909	ENDIF
[2128]	910	END DO
	911
	912	ENDIF
	913
	914	IF ( kt == nitiaufin_r + 1 ) THEN ! For bias crcn to work
	915	DEALLOCATE( t_bkginc )
	916	DEALLOCATE( s_bkginc )
	917	ENDIF
	918
	919
	920	ELSEIF ( ln_asmdin ) THEN
	921
	922	!--------------------------------------------------------------------
	923	! Direct Initialization
	924	!--------------------------------------------------------------------
	925
	926	IF ( kt == nitdin_r ) THEN
	927
	928	neuler = 0 ! Force Euler forward step
	929
	930	! Initialize the now fields with the background + increment
[3764]	931	IF (ln_temnofreeze) THEN
	932	! Do not apply negative increments if the temperature will fall below freezing
[4990]	933	WHERE( t_bkginc(:,:,:) > 0.0_wp .OR. tsn(:,:,:,jp_tem) + t_bkginc(:,:,:) > fzptnz(:,:,:) )
[3764]	934	tsn(:,:,:,jp_tem) = t_bkg(:,:,:) + t_bkginc(:,:,:)
	935	END WHERE
	936	ELSE
	937	tsn(:,:,:,jp_tem) = t_bkg(:,:,:) + t_bkginc(:,:,:)
	938	ENDIF
[2128]	939	IF (ln_salfix) THEN
[3764]	940	! Do not apply negative increments if the salinity will fall below a specified
	941	! minimum value salfixmin
[4990]	942	WHERE( s_bkginc(:,:,:) > 0.0_wp .OR. tsn(:,:,:,jp_sal) + s_bkginc(:,:,:) > salfixmin )
[3764]	943	tsn(:,:,:,jp_sal) = s_bkg(:,:,:) + s_bkginc(:,:,:)
	944	END WHERE
	945	ELSE
	946	tsn(:,:,:,jp_sal) = s_bkg(:,:,:) + s_bkginc(:,:,:)
[2128]	947	ENDIF
	948
[4990]	949	tsb(:,:,:,:) = tsn(:,:,:,:) ! Update before fields
[2128]	950
[4990]	951	CALL eos( tsb, rhd, rhop, gdept_0(:,:,:) ) ! Before potential and in situ densities
	952	!!gm fabien
	953	! CALL eos( tsb, rhd, rhop ) ! Before potential and in situ densities
	954	!!gm
	955
	956
[5120]	957	IF( ln_zps .AND. .NOT. lk_c1d .AND. .NOT. ln_isfcav) &
	958	& CALL zps_hde ( kt, jpts, tsb, gtsu, gtsv, & ! Partial steps: before horizontal gradient
	959	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
	960	IF( ln_zps .AND. .NOT. lk_c1d .AND. ln_isfcav) &
	961	& CALL zps_hde_isf( nit000, jpts, tsb, gtsu, gtsv, & ! Partial steps for top cell (ISF)
	962	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
	963	& gtui, gtvi, grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi ) ! of t, s, rd at the last ocean level
[2128]	964
[3764]	965	#if defined key_zdfkpp
[4313]	966	CALL eos( tsn, rhd, fsdept_n(:,:,:) ) ! Compute rhd
[4990]	967	!!gm fabien CALL eos( tsn, rhd ) ! Compute rhd
[3764]	968	#endif
	969
[2128]	970	DEALLOCATE( t_bkginc )
	971	DEALLOCATE( s_bkginc )
	972	DEALLOCATE( t_bkg )
	973	DEALLOCATE( s_bkg )
	974	ENDIF
[2392]	975	!
[2128]	976	ENDIF
[3764]	977	! Perhaps the following call should be in step
	978	IF ( ln_seaiceinc ) CALL seaice_asm_inc ( kt ) ! apply sea ice concentration increment
[12611]	979	IF ( ln_sitinc ) CALL sit_asm_inc ( kt ) ! apply sea ice thickness increment
[2392]	980	!
[2128]	981	END SUBROUTINE tra_asm_inc
	982
[2392]	983
[2128]	984	SUBROUTINE dyn_asm_inc( kt )
	985	!!----------------------------------------------------------------------
	986	!! * ROUTINE dyn_asm_inc *
	987	!!
	988	!! ** Purpose : Apply the dynamics (u and v) assimilation increments.
	989	!!
	990	!! ** Method : Direct initialization or Incremental Analysis Updating.
	991	!!
	992	!! ** Action :
	993	!!----------------------------------------------------------------------
	994	INTEGER, INTENT(IN) :: kt ! Current time step
[2392]	995	!
[2128]	996	INTEGER :: jk
	997	INTEGER :: it
	998	REAL(wp) :: zincwgt ! IAU weight for current time step
[2392]	999	!!----------------------------------------------------------------------
[2128]	1000
	1001	IF ( ln_asmiau ) THEN
	1002
	1003	!--------------------------------------------------------------------
	1004	! Incremental Analysis Updating
	1005	!--------------------------------------------------------------------
	1006
	1007	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	1008
	1009	it = kt - nit000 + 1
	1010	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
	1011
	1012	IF(lwp) THEN
	1013	WRITE(numout,*)
	1014	WRITE(numout,*) 'dyn_asm_inc : Dynamics IAU at time step = ', &
	1015	& kt,' with IAU weight = ', wgtiau(it)
	1016	WRITE(numout,*) '~~~~~~~~~~~~'
	1017	ENDIF
	1018
	1019	! Update the dynamic tendencies
	1020	DO jk = 1, jpkm1
	1021	ua(:,:,jk) = ua(:,:,jk) + u_bkginc(:,:,jk) * zincwgt
	1022	va(:,:,jk) = va(:,:,jk) + v_bkginc(:,:,jk) * zincwgt
	1023	END DO
	1024
	1025	IF ( kt == nitiaufin_r ) THEN
	1026	DEALLOCATE( u_bkginc )
	1027	DEALLOCATE( v_bkginc )
	1028	ENDIF
	1029
	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 with the background + increment
	1043	un(:,:,:) = u_bkg(:,:,:) + u_bkginc(:,:,:)
	1044	vn(:,:,:) = v_bkg(:,:,:) + v_bkginc(:,:,:)
	1045
	1046	ub(:,:,:) = un(:,:,:) ! Update before fields
	1047	vb(:,:,:) = vn(:,:,:)
	1048
	1049	DEALLOCATE( u_bkg )
	1050	DEALLOCATE( v_bkg )
	1051	DEALLOCATE( u_bkginc )
	1052	DEALLOCATE( v_bkginc )
	1053	ENDIF
[2392]	1054	!
[2128]	1055	ENDIF
[2392]	1056	!
[2128]	1057	END SUBROUTINE dyn_asm_inc
	1058
[2392]	1059
[2128]	1060	SUBROUTINE ssh_asm_inc( kt )
	1061	!!----------------------------------------------------------------------
	1062	!! * ROUTINE ssh_asm_inc *
	1063	!!
	1064	!! ** Purpose : Apply the sea surface height assimilation increment.
	1065	!!
	1066	!! ** Method : Direct initialization or Incremental Analysis Updating.
	1067	!!
	1068	!! ** Action :
	1069	!!----------------------------------------------------------------------
	1070	INTEGER, INTENT(IN) :: kt ! Current time step
[2392]	1071	!
[2128]	1072	INTEGER :: it
[3764]	1073	INTEGER :: jk
[2128]	1074	REAL(wp) :: zincwgt ! IAU weight for current time step
[2392]	1075	!!----------------------------------------------------------------------
[2128]	1076
	1077	IF ( ln_asmiau ) THEN
	1078
	1079	!--------------------------------------------------------------------
	1080	! Incremental Analysis Updating
	1081	!--------------------------------------------------------------------
	1082
	1083	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	1084
	1085	it = kt - nit000 + 1
	1086	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
	1087
	1088	IF(lwp) THEN
	1089	WRITE(numout,*)
	1090	WRITE(numout,*) 'ssh_asm_inc : SSH IAU at time step = ', &
	1091	& kt,' with IAU weight = ', wgtiau(it)
	1092	WRITE(numout,*) '~~~~~~~~~~~~'
	1093	ENDIF
	1094
	1095	! Save the tendency associated with the IAU weighted SSH increment
	1096	! (applied in dynspg.*)
	1097	#if defined key_asminc
	1098	ssh_iau(:,:) = ssh_bkginc(:,:) * zincwgt
	1099	#endif
	1100	IF ( kt == nitiaufin_r ) THEN
	1101	DEALLOCATE( ssh_bkginc )
	1102	ENDIF
	1103
[9537]	1104	#if defined key_asminc
[9196]	1105	ELSE
	1106	ssh_iau(:,:) = 0._wp
[9537]	1107	#endif
[2128]	1108	ENDIF
	1109
	1110	ELSEIF ( ln_asmdin ) THEN
	1111
	1112	!--------------------------------------------------------------------
	1113	! Direct Initialization
	1114	!--------------------------------------------------------------------
	1115
	1116	IF ( kt == nitdin_r ) THEN
	1117
	1118	neuler = 0 ! Force Euler forward step
	1119
	1120	! Initialize the now fields the background + increment
	1121	sshn(:,:) = ssh_bkg(:,:) + ssh_bkginc(:,:)
	1122
[3764]	1123	! Update before fields
	1124	sshb(:,:) = sshn(:,:)
[2128]	1125
[3764]	1126	IF( lk_vvl ) THEN
	1127	DO jk = 1, jpk
	1128	fse3t_b(:,:,jk) = fse3t_n(:,:,jk)
	1129	END DO
	1130	ENDIF
	1131
[2128]	1132	DEALLOCATE( ssh_bkg )
	1133	DEALLOCATE( ssh_bkginc )
	1134
	1135	ENDIF
[2392]	1136	!
[2128]	1137	ENDIF
[2392]	1138	!
[2128]	1139	END SUBROUTINE ssh_asm_inc
	1140
[12611]	1141	SUBROUTINE sit_asm_inc( kt, kindic )
	1142	!!----------------------------------------------------------------------
	1143	!! * ROUTINE sit_asm_inc *
	1144	!!
	1145	!! ** Purpose : Apply the sea ice thickness assimilation increment.
	1146	!!
	1147	!! ** Method : Direct initialization or Incremental Analysis Updating.
	1148	!!
	1149	!! ** Action :
	1150	!!
	1151	!!----------------------------------------------------------------------
	1152	IMPLICIT NONE
	1153	!
	1154	INTEGER, INTENT(in) :: kt ! Current time step
	1155	INTEGER, INTENT(in), OPTIONAL :: kindic ! flag for disabling the deallocation
	1156	!
	1157	INTEGER :: it
	1158	REAL(wp) :: zincwgt ! IAU weight for current time step
	1159	!!----------------------------------------------------------------------
[3785]	1160
[12611]	1161	IF ( ln_asmiau ) THEN
	1162
	1163	!--------------------------------------------------------------------
	1164	! Incremental Analysis Updating
	1165	!--------------------------------------------------------------------
	1166
	1167	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	1168
	1169	it = kt - nit000 + 1
	1170	zincwgt = wgtiau(it) ! IAU weight for the current time step
	1171	! note this is not a tendency so should not be divided by rdt (as with the tracer and other increments)
	1172	! EF: Actually CICE is expecting a tendency so is divided by rdt below
	1173
	1174	IF(lwp) THEN
	1175	WRITE(numout,*)
	1176	WRITE(numout,*) 'sit_asm_inc : sea ice thick IAU at time step = ', &
	1177	& kt,' with IAU weight = ', wgtiau(it)
	1178	WRITE(numout,*) '~~~~~~~~~~~~'
	1179	ENDIF
	1180
	1181	#if defined key_cice && defined key_asminc
	1182	! Sea-ice thickness : CICE case. Pass ice thickness increment tendency into CICE
	1183	ndsit_da(:,:) = sit_bkginc(:,:) * zincwgt / rdt
	1184	#endif
	1185
	1186	IF ( kt == nitiaufin_r ) THEN
	1187	DEALLOCATE( sit_bkginc )
	1188	ENDIF
	1189
	1190	ELSE
	1191
	1192	#if defined key_cice && defined key_asminc
	1193	! Sea-ice thickness : CICE case. Zero ice increment tendency into CICE
	1194	ndsit_da(:,:) = 0.0_wp
	1195	#endif
	1196
	1197	ENDIF
	1198
	1199	ELSEIF ( ln_asmdin ) THEN
	1200
	1201	!--------------------------------------------------------------------
	1202	! Direct Initialization
	1203	!--------------------------------------------------------------------
	1204
	1205	IF ( kt == nitdin_r ) THEN
	1206
	1207	neuler = 0 ! Force Euler forward step
	1208
	1209	#if defined key_cice && defined key_asminc
	1210	! Sea-ice thickness : CICE case. Pass ice thickness increment tendency into CICE
	1211	ndsit_da(:,:) = sit_bkginc(:,:) / rdt
	1212	#endif
	1213	IF ( .NOT. PRESENT(kindic) ) THEN
	1214	DEALLOCATE( sit_bkginc )
	1215	END IF
	1216
	1217	ELSE
	1218
	1219	#if defined key_cice && defined key_asminc
	1220	! Sea-ice thicnkness : CICE case. Zero ice thickness increment tendency into CICE
	1221	ndsit_da(:,:) = 0.0_wp
	1222	#endif
	1223
	1224	ENDIF
	1225
	1226	ENDIF
	1227
	1228	END SUBROUTINE sit_asm_inc
	1229
[3764]	1230	SUBROUTINE seaice_asm_inc( kt, kindic )
	1231	!!----------------------------------------------------------------------
	1232	!! * ROUTINE seaice_asm_inc *
	1233	!!
	1234	!! ** Purpose : Apply the sea ice assimilation increment.
	1235	!!
	1236	!! ** Method : Direct initialization or Incremental Analysis Updating.
	1237	!!
	1238	!! ** Action :
	1239	!!
	1240	!!----------------------------------------------------------------------
	1241	IMPLICIT NONE
[3785]	1242	!
	1243	INTEGER, INTENT(in) :: kt ! Current time step
	1244	INTEGER, INTENT(in), OPTIONAL :: kindic ! flag for disabling the deallocation
	1245	!
	1246	INTEGER :: it
	1247	REAL(wp) :: zincwgt ! IAU weight for current time step
	1248	#if defined key_lim2
	1249	REAL(wp), DIMENSION(jpi,jpj) :: zofrld, zohicif, zseaicendg, zhicifinc ! LIM
	1250	REAL(wp) :: zhicifmin = 0.5_wp ! ice minimum depth in metres
[3764]	1251	#endif
[3785]	1252	!!----------------------------------------------------------------------
[3764]	1253
	1254	IF ( ln_asmiau ) THEN
	1255
	1256	!--------------------------------------------------------------------
	1257	! Incremental Analysis Updating
	1258	!--------------------------------------------------------------------
	1259
	1260	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	1261
	1262	it = kt - nit000 + 1
	1263	zincwgt = wgtiau(it) ! IAU weight for the current time step
	1264	! note this is not a tendency so should not be divided by rdt (as with the tracer and other increments)
	1265
	1266	IF(lwp) THEN
	1267	WRITE(numout,*)
	1268	WRITE(numout,*) 'seaice_asm_inc : sea ice conc IAU at time step = ', &
	1269	& kt,' with IAU weight = ', wgtiau(it)
	1270	WRITE(numout,*) '~~~~~~~~~~~~'
	1271	ENDIF
	1272
[3785]	1273	! Sea-ice : LIM-3 case (to add)
[3764]	1274
[3785]	1275	#if defined key_lim2
	1276	! Sea-ice : LIM-2 case
	1277	zofrld (:,:) = frld(:,:)
	1278	zohicif(:,:) = hicif(:,:)
	1279	!
	1280	frld = MIN( MAX( frld (:,:) - seaice_bkginc(:,:) * zincwgt, 0.0_wp), 1.0_wp)
[3764]	1281	pfrld = MIN( MAX( pfrld(:,:) - seaice_bkginc(:,:) * zincwgt, 0.0_wp), 1.0_wp)
	1282	fr_i(:,:) = 1.0_wp - frld(:,:) ! adjust ice fraction
[3785]	1283	!
	1284	zseaicendg(:,:) = zofrld(:,:) - frld(:,:) ! find out actual sea ice nudge applied
	1285	!
[3764]	1286	! Nudge sea ice depth to bring it up to a required minimum depth
	1287	WHERE( zseaicendg(:,:) > 0.0_wp .AND. hicif(:,:) < zhicifmin )
	1288	zhicifinc(:,:) = (zhicifmin - hicif(:,:)) * zincwgt
	1289	ELSEWHERE
	1290	zhicifinc(:,:) = 0.0_wp
	1291	END WHERE
[3785]	1292	!
	1293	! nudge ice depth
	1294	hicif (:,:) = hicif (:,:) + zhicifinc(:,:)
	1295	phicif(:,:) = phicif(:,:) + zhicifinc(:,:)
	1296	!
	1297	! seaice salinity balancing (to add)
[3764]	1298	#endif
	1299
[4245]	1300	#if defined key_cice && defined key_asminc
[3785]	1301	! Sea-ice : CICE case. Pass ice increment tendency into CICE
[3764]	1302	ndaice_da(:,:) = seaice_bkginc(:,:) * zincwgt / rdt
	1303	#endif
	1304
	1305	IF ( kt == nitiaufin_r ) THEN
	1306	DEALLOCATE( seaice_bkginc )
	1307	ENDIF
	1308
	1309	ELSE
	1310
[4245]	1311	#if defined key_cice && defined key_asminc
[3785]	1312	! Sea-ice : CICE case. Zero ice increment tendency into CICE
[3764]	1313	ndaice_da(:,:) = 0.0_wp
	1314	#endif
	1315
	1316	ENDIF
	1317
	1318	ELSEIF ( ln_asmdin ) THEN
	1319
	1320	!--------------------------------------------------------------------
	1321	! Direct Initialization
	1322	!--------------------------------------------------------------------
	1323
	1324	IF ( kt == nitdin_r ) THEN
	1325
	1326	neuler = 0 ! Force Euler forward step
	1327
[3785]	1328	! Sea-ice : LIM-3 case (to add)
[3764]	1329
[3785]	1330	#if defined key_lim2
	1331	! Sea-ice : LIM-2 case.
[3764]	1332	zofrld(:,:)=frld(:,:)
	1333	zohicif(:,:)=hicif(:,:)
[3785]	1334	!
[3764]	1335	! Initialize the now fields the background + increment
[3785]	1336	frld (:,:) = MIN( MAX( frld(:,:) - seaice_bkginc(:,:), 0.0_wp), 1.0_wp)
[3764]	1337	pfrld(:,:) = frld(:,:)
[3785]	1338	fr_i (:,:) = 1.0_wp - frld(:,:) ! adjust ice fraction
	1339	zseaicendg(:,:) = zofrld(:,:) - frld(:,:) ! find out actual sea ice nudge applied
	1340	!
[3764]	1341	! Nudge sea ice depth to bring it up to a required minimum depth
	1342	WHERE( zseaicendg(:,:) > 0.0_wp .AND. hicif(:,:) < zhicifmin )
	1343	zhicifinc(:,:) = (zhicifmin - hicif(:,:)) * zincwgt
	1344	ELSEWHERE
	1345	zhicifinc(:,:) = 0.0_wp
	1346	END WHERE
[3785]	1347	!
	1348	! nudge ice depth
	1349	hicif (:,:) = hicif (:,:) + zhicifinc(:,:)
	1350	phicif(:,:) = phicif(:,:)
	1351	!
	1352	! seaice salinity balancing (to add)
[3764]	1353	#endif
	1354
[4245]	1355	#if defined key_cice && defined key_asminc
	1356	! Sea-ice : CICE case. Pass ice increment tendency into CICE
[3764]	1357	ndaice_da(:,:) = seaice_bkginc(:,:) / rdt
	1358	#endif
	1359	IF ( .NOT. PRESENT(kindic) ) THEN
	1360	DEALLOCATE( seaice_bkginc )
	1361	END IF
	1362
	1363	ELSE
	1364
[4245]	1365	#if defined key_cice && defined key_asminc
[3785]	1366	! Sea-ice : CICE case. Zero ice increment tendency into CICE
[3764]	1367	ndaice_da(:,:) = 0.0_wp
	1368	#endif
	1369
	1370	ENDIF
	1371
[3785]	1372	!#if defined defined key_lim2 \|\| defined key_cice
[3764]	1373	!
	1374	! IF (ln_seaicebal ) THEN
	1375	! !! balancing salinity increments
	1376	! !! simple case from limflx.F90 (doesn't include a mass flux)
	1377	! !! assumption is that as ice concentration is reduced or increased
	1378	! !! the snow and ice depths remain constant
	1379	! !! note that snow is being created where ice concentration is being increased
	1380	! !! - could be more sophisticated and
	1381	! !! not do this (but would need to alter h_snow)
	1382	!
	1383	! usave(:,:,:)=sb(:,:,:) ! use array as a temporary store
	1384	!
	1385	! DO jj = 1, jpj
	1386	! DO ji = 1, jpi
	1387	! ! calculate change in ice and snow mass per unit area
	1388	! ! positive values imply adding salt to the ocean (results from ice formation)
	1389	! ! fwf : ice formation and melting
	1390	!
	1391	! zfons = ( -nfresh_da(ji,jj)soce + nfsalt_da(ji,jj) )rdt
	1392	!
	1393	! ! change salinity down to mixed layer depth
	1394	! mld=hmld_kara(ji,jj)
	1395	!
	1396	! ! prevent small mld
	1397	! ! less than 10m can cause salinity instability
	1398	! IF (mld < 10) mld=10
	1399	!
	1400	! ! set to bottom of a level
	1401	! DO jk = jpk-1, 2, -1
	1402	! IF ((mld > gdepw(ji,jj,jk)) .and. (mld < gdepw(ji,jj,jk+1))) THEN
	1403	! mld=gdepw(ji,jj,jk+1)
	1404	! jkmax=jk
	1405	! ENDIF
	1406	! ENDDO
	1407	!
	1408	! ! avoid applying salinity balancing in shallow water or on land
	1409	! !
	1410	!
	1411	! ! dsal_ocn (psu kg m^-2) / (kg m^-3 * m)
	1412	!
	1413	! dsal_ocn=0.0_wp
	1414	! sal_thresh=5.0_wp ! minimum salinity threshold for salinity balancing
	1415	!
	1416	! if (tmask(ji,jj,1) > 0 .AND. tmask(ji,jj,jkmax) > 0 ) &
	1417	! dsal_ocn = zfons / (rhop(ji,jj,1) * mld)
	1418	!
	1419	! ! put increments in for levels in the mixed layer
	1420	! ! but prevent salinity below a threshold value
	1421	!
	1422	! DO jk = 1, jkmax
	1423	!
	1424	! IF (dsal_ocn > 0.0_wp .or. sb(ji,jj,jk)+dsal_ocn > sal_thresh) THEN
	1425	! sb(ji,jj,jk) = sb(ji,jj,jk) + dsal_ocn
	1426	! sn(ji,jj,jk) = sn(ji,jj,jk) + dsal_ocn
	1427	! ENDIF
	1428	!
	1429	! ENDDO
	1430	!
	1431	! ! ! salt exchanges at the ice/ocean interface
	1432	! ! zpmess = zfons / rdt_ice ! rdt_ice is ice timestep
	1433	! !
	1434	! !! Adjust fsalt. A +ve fsalt means adding salt to ocean
	1435	! !! fsalt(ji,jj) = fsalt(ji,jj) + zpmess ! adjust fsalt
	1436	! !!
	1437	! !! emps(ji,jj) = emps(ji,jj) + zpmess ! or adjust emps (see icestp1d)
	1438	! !! ! E-P (kg m-2 s-2)
	1439	! ! emp(ji,jj) = emp(ji,jj) + zpmess ! E-P (kg m-2 s-2)
	1440	! ENDDO !ji
	1441	! ENDDO !jj!
	1442	!
	1443	! ENDIF !ln_seaicebal
	1444	!
	1445	!#endif
	1446
	1447	ENDIF
	1448
	1449	END SUBROUTINE seaice_asm_inc
[10728]	1450
	1451
	1452	SUBROUTINE bgc_asm_inc( kt )
	1453	!!----------------------------------------------------------------------
	1454	!! * ROUTINE bgc_asm_inc *
	1455	!!
	1456	!! ** Purpose : Apply the biogeochemistry assimilation increments
	1457	!!
	1458	!! ** Method : Call relevant routines in asmbgc
	1459	!!
	1460	!! ** Action : Call relevant routines in asmbgc
	1461	!!
	1462	!!----------------------------------------------------------------------
	1463	!!
	1464	INTEGER, INTENT(in ) :: kt ! Current time step
	1465	!
	1466	INTEGER :: icycper ! Dimension of wgtiau
	1467	!!
	1468	!!----------------------------------------------------------------------
	1469
	1470	icycper = SIZE( wgtiau )
	1471
	1472	! Ocean colour variables first
	1473	IF ( ln_slchltotinc .OR. ln_slchldiainc .OR. ln_slchlnoninc .OR. &
	1474	& ln_slchlnaninc .OR. ln_slchlpicinc .OR. ln_slchldininc .OR. &
	1475	& ln_schltotinc .OR. ln_slphytotinc .OR. ln_slphydiainc .OR. &
	1476	& ln_slphynoninc ) THEN
	1477	CALL phyto2d_asm_inc( kt, ln_asmdin, ln_asmiau, icycper, wgtiau )
	1478	ENDIF
	1479
	1480	! Surface pCO2/fCO2 next
	1481	IF ( ln_sfco2inc .OR. ln_spco2inc ) THEN
	1482	CALL pco2_asm_inc( kt, ln_asmdin, ln_asmiau, icycper, wgtiau, &
	1483	& ln_trainc, t_bkginc, s_bkginc )
	1484	ENDIF
	1485
	1486	! Profile pH next
	1487	IF ( ln_pphinc ) THEN
	1488	CALL ph_asm_inc( kt, ln_asmdin, ln_asmiau, icycper, wgtiau, &
	1489	& ln_trainc, t_bkginc, s_bkginc )
	1490	ENDIF
	1491
	1492	! Then chlorophyll profiles
[13318]	1493	IF ( ln_plchltotinc .OR. ln_pchltotinc .OR. ln_plchldiainc .OR. &
	1494	& ln_plchlnaninc .OR. ln_plchlpicinc .OR. ln_plchldininc ) THEN
[10728]	1495	CALL phyto3d_asm_inc( kt, ln_asmdin, ln_asmiau, icycper, wgtiau )
	1496	ENDIF
	1497
	1498	! Remaining bgc profile variables
	1499	IF ( ln_pno3inc .OR. ln_psi4inc .OR. ln_pdicinc .OR. &
	1500	& ln_palkinc .OR. ln_po2inc .OR. ln_ppo4inc ) THEN
	1501	CALL bgc3d_asm_inc( kt, ln_asmdin, ln_asmiau, icycper, wgtiau )
	1502	ENDIF
	1503
	1504	END SUBROUTINE bgc_asm_inc
[3785]	1505
[2392]	1506	!!======================================================================
[2128]	1507	END MODULE asminc

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