New URL for NEMO forge! http://forge.nemo-ocean.eu

Since March 2022 along with NEMO 4.2 release, the code development moved to a self-hosted GitLab.
This present forge is now archived and remained online for history.

asminc.F90 in branches/2014/dev_r4650_UKMO7_STARTHOUR/NEMOGCM/NEMO/OPA_SRC/ASM – NEMO

Context Navigation

source: branches/2014/dev_r4650_UKMO7_STARTHOUR/NEMOGCM/NEMO/OPA_SRC/ASM/asminc.F90 @ 5980

Last change on this file since 5980 was 5980, checked in by timgraham, 8 years ago
Upgraded to v3.6 revision of trunk (r5518)
Property svn:keywords set to `Id`
File size: 45.4 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
[5872]	13	!! ! 2014-09 (D. Lea) Local calc_date removed use routine from OBS
	14	!! ! 2015-11 (D. Lea) Handle non-zero initial time of day
[2392]	15	!!----------------------------------------------------------------------
[2128]	16
	17	!!----------------------------------------------------------------------
[3785]	18	!! 'key_asminc' : Switch on the assimilation increment interface
[2128]	19	!!----------------------------------------------------------------------
[3785]	20	!! asm_inc_init : Initialize the increment arrays and IAU weights
	21	!! tra_asm_inc : Apply the tracer (T and S) increments
	22	!! dyn_asm_inc : Apply the dynamic (u and v) increments
	23	!! ssh_asm_inc : Apply the SSH increment
	24	!! seaice_asm_inc : Apply the seaice 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.
[4811]	43	USE diaobs, ONLY: calc_date ! Compute the calendar date on a given step
[2128]	44
	45	IMPLICIT NONE
	46	PRIVATE
[2392]	47
	48	PUBLIC asm_inc_init !: Initialize the increment arrays and IAU weights
	49	PUBLIC tra_asm_inc !: Apply the tracer (T and S) increments
	50	PUBLIC dyn_asm_inc !: Apply the dynamic (u and v) increments
	51	PUBLIC ssh_asm_inc !: Apply the SSH increment
[3764]	52	PUBLIC seaice_asm_inc !: Apply the seaice increment
[2128]	53
	54	#if defined key_asminc
[2392]	55	LOGICAL, PUBLIC, PARAMETER :: lk_asminc = .TRUE. !: Logical switch for assimilation increment interface
[2128]	56	#else
[2392]	57	LOGICAL, PUBLIC, PARAMETER :: lk_asminc = .FALSE. !: No assimilation increments
[2128]	58	#endif
[5075]	59	LOGICAL, PUBLIC :: ln_bkgwri = .FALSE. !: No output of the background state fields
	60	LOGICAL, PUBLIC :: ln_asmiau = .FALSE. !: No applying forcing with an assimilation increment
	61	LOGICAL, PUBLIC :: ln_asmdin = .FALSE. !: No direct initialization
	62	LOGICAL, PUBLIC :: ln_trainc = .FALSE. !: No tracer (T and S) assimilation increments
	63	LOGICAL, PUBLIC :: ln_dyninc = .FALSE. !: No dynamics (u and v) assimilation increments
	64	LOGICAL, PUBLIC :: ln_sshinc = .FALSE. !: No sea surface height assimilation increment
	65	LOGICAL, PUBLIC :: ln_seaiceinc !: No sea ice concentration increment
	66	LOGICAL, PUBLIC :: ln_salfix = .FALSE. !: Apply minimum salinity check
[3764]	67	LOGICAL, PUBLIC :: ln_temnofreeze = .FALSE. !: Don't allow the temperature to drop below freezing
[5075]	68	INTEGER, PUBLIC :: nn_divdmp !: Apply divergence damping filter nn_divdmp times
[2128]	69
[2392]	70	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: t_bkg , s_bkg !: Background temperature and salinity
	71	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: u_bkg , v_bkg !: Background u- & v- velocity components
	72	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: t_bkginc, s_bkginc !: Increment to the background T & S
	73	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: u_bkginc, v_bkginc !: Increment to the u- & v-components
	74	REAL(wp), PUBLIC, DIMENSION(:) , ALLOCATABLE :: wgtiau !: IAU weights for each time step
[2128]	75	#if defined key_asminc
[2392]	76	REAL(wp), PUBLIC, DIMENSION(:,:), ALLOCATABLE :: ssh_iau !: IAU-weighted sea surface height increment
[2128]	77	#endif
[2392]	78	! !!! time steps relative to the cycle interval [0,nitend-nit000-1]
	79	INTEGER , PUBLIC :: nitbkg !: Time step of the background state used in the Jb term
	80	INTEGER , PUBLIC :: nitdin !: Time step of the background state for direct initialization
	81	INTEGER , PUBLIC :: nitiaustr !: Time step of the start of the IAU interval
	82	INTEGER , PUBLIC :: nitiaufin !: Time step of the end of the IAU interval
	83	!
	84	INTEGER , PUBLIC :: niaufn !: Type of IAU weighing function: = 0 Constant weighting
	85	! !: = 1 Linear hat-like, centred in middle of IAU interval
	86	REAL(wp), PUBLIC :: salfixmin !: Ensure that the salinity is larger than this value if (ln_salfix)
[2128]	87
[2392]	88	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ssh_bkg, ssh_bkginc ! Background sea surface height and its increment
[3764]	89	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: seaice_bkginc ! Increment to the background sea ice conc
[2128]	90
[3294]	91	!! * Substitutions
	92	# include "domzgr_substitute.h90"
	93	# include "ldfdyn_substitute.h90"
	94	# include "vectopt_loop_substitute.h90"
[2287]	95	!!----------------------------------------------------------------------
	96	!! NEMO/OPA 3.3 , NEMO Consortium (2010)
	97	!! $Id$
[2392]	98	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[2287]	99	!!----------------------------------------------------------------------
[2128]	100	CONTAINS
	101
	102	SUBROUTINE asm_inc_init
	103	!!----------------------------------------------------------------------
	104	!! * ROUTINE asm_inc_init *
	105	!!
	106	!! ** Purpose : Initialize the assimilation increment and IAU weights.
	107	!!
	108	!! ** Method : Initialize the assimilation increment and IAU weights.
	109	!!
	110	!! ** Action :
	111	!!----------------------------------------------------------------------
[5075]	112	INTEGER :: ji, jj, jk, jt ! dummy loop indices
	113	INTEGER :: imid, inum ! local integers
	114	INTEGER :: ios ! Local integer output status for namelist read
[2128]	115	INTEGER :: iiauper ! Number of time steps in the IAU period
	116	INTEGER :: icycper ! Number of time steps in the cycle
[4811]	117	REAL(KIND=dp) :: ditend_date ! Date YYYYMMDD.HHMMSS of final time step
	118	REAL(KIND=dp) :: ditbkg_date ! Date YYYYMMDD.HHMMSS of background time step for Jb term
	119	REAL(KIND=dp) :: ditdin_date ! Date YYYYMMDD.HHMMSS of background time step for DI
	120	REAL(KIND=dp) :: ditiaustr_date ! Date YYYYMMDD.HHMMSS of IAU interval start time step
	121	REAL(KIND=dp) :: ditiaufin_date ! Date YYYYMMDD.HHMMSS of IAU interval final time step
	122
[2128]	123	REAL(wp) :: znorm ! Normalization factor for IAU weights
[5075]	124	REAL(wp) :: ztotwgt ! Value of time-integrated IAU weights (should be equal to one)
[2128]	125	REAL(wp) :: z_inc_dateb ! Start date of interval on which increment is valid
	126	REAL(wp) :: z_inc_datef ! End date of interval on which increment is valid
	127	REAL(wp) :: zdate_bkg ! Date in background state file for DI
	128	REAL(wp) :: zdate_inc ! Time axis in increments file
[5075]	129	!
	130	REAL(wp), POINTER, DIMENSION(:,:) :: hdiv ! 2D workspace
[2392]	131	!!
[3764]	132	NAMELIST/nam_asminc/ ln_bkgwri, &
[2392]	133	& ln_trainc, ln_dyninc, ln_sshinc, &
	134	& ln_asmdin, ln_asmiau, &
	135	& nitbkg, nitdin, nitiaustr, nitiaufin, niaufn, &
[5075]	136	& ln_salfix, salfixmin, nn_divdmp
[2392]	137	!!----------------------------------------------------------------------
[2128]	138
	139	!-----------------------------------------------------------------------
	140	! Read Namelist nam_asminc : assimilation increment interface
	141	!-----------------------------------------------------------------------
[3764]	142	ln_seaiceinc = .FALSE.
	143	ln_temnofreeze = .FALSE.
[2128]	144
[4147]	145	REWIND( numnam_ref ) ! Namelist nam_asminc in reference namelist : Assimilation increment
	146	READ ( numnam_ref, nam_asminc, IOSTAT = ios, ERR = 901)
	147	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nam_asminc in reference namelist', lwp )
[2128]	148
[4147]	149	REWIND( numnam_cfg ) ! Namelist nam_asminc in configuration namelist : Assimilation increment
	150	READ ( numnam_cfg, nam_asminc, IOSTAT = ios, ERR = 902 )
	151	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nam_asminc in configuration namelist', lwp )
[4624]	152	IF(lwm) WRITE ( numond, nam_asminc )
[4147]	153
[2128]	154	! Control print
	155	IF(lwp) THEN
	156	WRITE(numout,*)
	157	WRITE(numout,*) 'asm_inc_init : Assimilation increment initialization :'
	158	WRITE(numout,*) '~~~~~~~~~~~~'
[2392]	159	WRITE(numout,*) ' Namelist namasm : set assimilation increment parameters'
	160	WRITE(numout,*) ' Logical switch for writing out background state ln_bkgwri = ', ln_bkgwri
	161	WRITE(numout,*) ' Logical switch for applying tracer increments ln_trainc = ', ln_trainc
	162	WRITE(numout,*) ' Logical switch for applying velocity increments ln_dyninc = ', ln_dyninc
	163	WRITE(numout,*) ' Logical switch for applying SSH increments ln_sshinc = ', ln_sshinc
	164	WRITE(numout,*) ' Logical switch for Direct Initialization (DI) ln_asmdin = ', ln_asmdin
[3764]	165	WRITE(numout,*) ' Logical switch for applying sea ice increments ln_seaiceinc = ', ln_seaiceinc
[2392]	166	WRITE(numout,*) ' Logical switch for Incremental Analysis Updating (IAU) ln_asmiau = ', ln_asmiau
	167	WRITE(numout,*) ' Timestep of background in [0,nitend-nit000-1] nitbkg = ', nitbkg
	168	WRITE(numout,*) ' Timestep of background for DI in [0,nitend-nit000-1] nitdin = ', nitdin
	169	WRITE(numout,*) ' Timestep of start of IAU interval in [0,nitend-nit000-1] nitiaustr = ', nitiaustr
	170	WRITE(numout,*) ' Timestep of end of IAU interval in [0,nitend-nit000-1] nitiaufin = ', nitiaufin
	171	WRITE(numout,*) ' Type of IAU weighting function niaufn = ', niaufn
	172	WRITE(numout,*) ' Logical switch for ensuring that the sa > salfixmin ln_salfix = ', ln_salfix
	173	WRITE(numout,*) ' Minimum salinity after applying the increments salfixmin = ', salfixmin
[2128]	174	ENDIF
	175
	176	nitbkg_r = nitbkg + nit000 - 1 ! Background time referenced to nit000
	177	nitdin_r = nitdin + nit000 - 1 ! Background time for DI referenced to nit000
	178	nitiaustr_r = nitiaustr + nit000 - 1 ! Start of IAU interval referenced to nit000
	179	nitiaufin_r = nitiaufin + nit000 - 1 ! End of IAU interval referenced to nit000
	180
	181	iiauper = nitiaufin_r - nitiaustr_r + 1 ! IAU interval length
	182	icycper = nitend - nit000 + 1 ! Cycle interval length
	183
	184	! Date of final time step
[4811]	185	CALL calc_date( nitend, ditend_date )
[2128]	186
	187	! Background time for Jb referenced to ndate0
[4811]	188	CALL calc_date( nitbkg_r, ditbkg_date )
[2128]	189
	190	! Background time for DI referenced to ndate0
[4811]	191	CALL calc_date( nitdin_r, ditdin_date )
[2128]	192
	193	! IAU start time referenced to ndate0
[4811]	194	CALL calc_date( nitiaustr_r, ditiaustr_date )
[2128]	195
	196	! IAU end time referenced to ndate0
[4811]	197	CALL calc_date( nitiaufin_r, ditiaufin_date )
[2128]	198
	199	IF(lwp) THEN
	200	WRITE(numout,*)
	201	WRITE(numout,*) ' Time steps referenced to current cycle:'
	202	WRITE(numout,*) ' iitrst = ', nit000 - 1
	203	WRITE(numout,*) ' nit000 = ', nit000
	204	WRITE(numout,*) ' nitend = ', nitend
	205	WRITE(numout,*) ' nitbkg_r = ', nitbkg_r
	206	WRITE(numout,*) ' nitdin_r = ', nitdin_r
	207	WRITE(numout,*) ' nitiaustr_r = ', nitiaustr_r
	208	WRITE(numout,*) ' nitiaufin_r = ', nitiaufin_r
	209	WRITE(numout,*)
	210	WRITE(numout,*) ' Dates referenced to current cycle:'
	211	WRITE(numout,*) ' ndastp = ', ndastp
	212	WRITE(numout,*) ' ndate0 = ', ndate0
[4811]	213	WRITE(numout,*) ' nn_time0 = ', nn_time0
	214	WRITE(numout,*) ' ditend_date = ', ditend_date
	215	WRITE(numout,*) ' ditbkg_date = ', ditbkg_date
	216	WRITE(numout,*) ' ditdin_date = ', ditdin_date
	217	WRITE(numout,*) ' ditiaustr_date = ', ditiaustr_date
	218	WRITE(numout,*) ' ditiaufin_date = ', ditiaufin_date
[2128]	219	ENDIF
	220
	221	IF ( nacc /= 0 ) &
	222	& CALL ctl_stop( ' nacc /= 0 and key_asminc :', &
	223	& ' Assimilation increments have only been implemented', &
	224	& ' for synchronous time stepping' )
	225
	226	IF ( ( ln_asmdin ).AND.( ln_asmiau ) ) &
	227	& CALL ctl_stop( ' ln_asmdin and ln_asmiau :', &
	228	& ' Choose Direct Initialization OR Incremental Analysis Updating')
	229
	230	IF ( ( ( .NOT. ln_asmdin ).AND.( .NOT. ln_asmiau ) ) &
[3764]	231	.AND.( ( ln_trainc ).OR.( ln_dyninc ).OR.( ln_sshinc ) .OR. ( ln_seaiceinc) )) &
	232	& CALL ctl_stop( ' One or more of ln_trainc, ln_dyninc, ln_sshinc and ln_seaiceinc is set to .true.', &
[2128]	233	& ' but ln_asmdin and ln_asmiau are both set to .false. :', &
	234	& ' Inconsistent options')
	235
	236	IF ( ( niaufn /= 0 ).AND.( niaufn /= 1 ) ) &
	237	& CALL ctl_stop( ' niaufn /= 0 or niaufn /=1 :', &
	238	& ' Type IAU weighting function is invalid')
	239
[3764]	240	IF ( ( .NOT. ln_trainc ).AND.( .NOT. ln_dyninc ).AND.( .NOT. ln_sshinc ).AND.( .NOT. ln_seaiceinc ) &
[2128]	241	& ) &
[3764]	242	& CALL ctl_warn( ' ln_trainc, ln_dyninc, ln_sshinc and ln_seaiceinc are set to .false. :', &
[2128]	243	& ' The assimilation increments are not applied')
	244
	245	IF ( ( ln_asmiau ).AND.( nitiaustr == nitiaufin ) ) &
	246	& CALL ctl_stop( ' nitiaustr = nitiaufin :', &
	247	& ' IAU interval is of zero length')
	248
	249	IF ( ( ln_asmiau ).AND.( ( nitiaustr_r < nit000 ).OR.( nitiaufin_r > nitend ) ) ) &
	250	& CALL ctl_stop( ' nitiaustr or nitiaufin :', &
	251	& ' IAU starting or final time step is outside the cycle interval', &
	252	& ' Valid range nit000 to nitend')
	253
	254	IF ( ( nitbkg_r < nit000 - 1 ).OR.( nitbkg_r > nitend ) ) &
	255	& CALL ctl_stop( ' nitbkg :', &
	256	& ' Background time step is outside the cycle interval')
	257
	258	IF ( ( nitdin_r < nit000 - 1 ).OR.( nitdin_r > nitend ) ) &
	259	& CALL ctl_stop( ' nitdin :', &
	260	& ' Background time step for Direct Initialization is outside', &
	261	& ' the cycle interval')
	262
	263	IF ( nstop > 0 ) RETURN ! if there are any errors then go no further
	264
	265	!--------------------------------------------------------------------
	266	! Initialize the Incremental Analysis Updating weighting function
	267	!--------------------------------------------------------------------
	268
	269	IF ( ln_asmiau ) THEN
	270
	271	ALLOCATE( wgtiau( icycper ) )
	272
	273	wgtiau(:) = 0.0
	274
	275	IF ( niaufn == 0 ) THEN
	276
	277	!---------------------------------------------------------
	278	! Constant IAU forcing
	279	!---------------------------------------------------------
	280
	281	DO jt = 1, iiauper
	282	wgtiau(jt+nitiaustr-1) = 1.0 / REAL( iiauper )
	283	END DO
	284
	285	ELSEIF ( niaufn == 1 ) THEN
	286
	287	!---------------------------------------------------------
	288	! Linear hat-like, centred in middle of IAU interval
	289	!---------------------------------------------------------
	290
	291	! Compute the normalization factor
	292	znorm = 0.0
	293	IF ( MOD( iiauper, 2 ) == 0 ) THEN ! Even number of time steps in IAU interval
	294	imid = iiauper / 2
	295	DO jt = 1, imid
	296	znorm = znorm + REAL( jt )
	297	END DO
	298	znorm = 2.0 * znorm
	299	ELSE ! Odd number of time steps in IAU interval
	300	imid = ( iiauper + 1 ) / 2
	301	DO jt = 1, imid - 1
	302	znorm = znorm + REAL( jt )
	303	END DO
	304	znorm = 2.0 * znorm + REAL( imid )
	305	ENDIF
	306	znorm = 1.0 / znorm
	307
	308	DO jt = 1, imid - 1
	309	wgtiau(jt+nitiaustr-1) = REAL( jt ) * znorm
	310	END DO
	311	DO jt = imid, iiauper
	312	wgtiau(jt+nitiaustr-1) = REAL( iiauper - jt + 1 ) * znorm
	313	END DO
	314
	315	ENDIF
	316
	317	! Test that the integral of the weights over the weighting interval equals 1
	318	IF(lwp) THEN
	319	WRITE(numout,*)
	320	WRITE(numout,*) 'asm_inc_init : IAU weights'
	321	WRITE(numout,*) '~~~~~~~~~~~~'
	322	WRITE(numout,*) ' time step IAU weight'
	323	WRITE(numout,*) ' ========= ====================='
	324	ztotwgt = 0.0
	325	DO jt = 1, icycper
	326	ztotwgt = ztotwgt + wgtiau(jt)
	327	WRITE(numout,*) ' ', jt, ' ', wgtiau(jt)
	328	END DO
	329	WRITE(numout,*) ' ==================================='
	330	WRITE(numout,*) ' Time-integrated weight = ', ztotwgt
	331	WRITE(numout,*) ' ==================================='
	332	ENDIF
	333
	334	ENDIF
	335
	336	!--------------------------------------------------------------------
	337	! Allocate and initialize the increment arrays
	338	!--------------------------------------------------------------------
	339
	340	ALLOCATE( t_bkginc(jpi,jpj,jpk) )
	341	ALLOCATE( s_bkginc(jpi,jpj,jpk) )
	342	ALLOCATE( u_bkginc(jpi,jpj,jpk) )
	343	ALLOCATE( v_bkginc(jpi,jpj,jpk) )
	344	ALLOCATE( ssh_bkginc(jpi,jpj) )
[3764]	345	ALLOCATE( seaice_bkginc(jpi,jpj))
[2128]	346	#if defined key_asminc
	347	ALLOCATE( ssh_iau(jpi,jpj) )
	348	#endif
	349	t_bkginc(:,:,:) = 0.0
	350	s_bkginc(:,:,:) = 0.0
	351	u_bkginc(:,:,:) = 0.0
	352	v_bkginc(:,:,:) = 0.0
	353	ssh_bkginc(:,:) = 0.0
[3764]	354	seaice_bkginc(:,:) = 0.0
[2128]	355	#if defined key_asminc
	356	ssh_iau(:,:) = 0.0
	357	#endif
[3764]	358	IF ( ( ln_trainc ).OR.( ln_dyninc ).OR.( ln_sshinc ).OR.( ln_seaiceinc ) ) THEN
[2128]	359
	360	!--------------------------------------------------------------------
	361	! Read the increments from file
	362	!--------------------------------------------------------------------
	363
	364	CALL iom_open( c_asminc, inum )
	365
	366	CALL iom_get( inum, 'time', zdate_inc )
	367
	368	CALL iom_get( inum, 'z_inc_dateb', z_inc_dateb )
	369	CALL iom_get( inum, 'z_inc_datef', z_inc_datef )
	370	z_inc_dateb = zdate_inc
	371	z_inc_datef = zdate_inc
	372
	373	IF(lwp) THEN
	374	WRITE(numout,*)
	375	WRITE(numout,*) 'asm_inc_init : Assimilation increments valid ', &
[4811]	376	& ' between dates ', z_inc_dateb,' and ', &
	377	& z_inc_datef
[2128]	378	WRITE(numout,*) '~~~~~~~~~~~~'
	379	ENDIF
	380
[5872]	381	IF ( ( z_inc_dateb < ndastp + nn_time0*0.0001_wp ) &
[4811]	382	& .OR.( z_inc_datef > ditend_date ) ) &
[2128]	383	& CALL ctl_warn( ' Validity time of assimilation increments is ', &
	384	& ' outside the assimilation interval' )
	385
[4811]	386	IF ( ( ln_asmdin ).AND.( zdate_inc /= ditdin_date ) ) &
[2128]	387	& CALL ctl_warn( ' Validity time of assimilation increments does ', &
	388	& ' not agree with Direct Initialization time' )
	389
	390	IF ( ln_trainc ) THEN
	391	CALL iom_get( inum, jpdom_autoglo, 'bckint', t_bkginc, 1 )
	392	CALL iom_get( inum, jpdom_autoglo, 'bckins', s_bkginc, 1 )
	393	! Apply the masks
	394	t_bkginc(:,:,:) = t_bkginc(:,:,:) * tmask(:,:,:)
	395	s_bkginc(:,:,:) = s_bkginc(:,:,:) * tmask(:,:,:)
	396	! Set missing increments to 0.0 rather than 1e+20
	397	! to allow for differences in masks
	398	WHERE( ABS( t_bkginc(:,:,:) ) > 1.0e+10 ) t_bkginc(:,:,:) = 0.0
	399	WHERE( ABS( s_bkginc(:,:,:) ) > 1.0e+10 ) s_bkginc(:,:,:) = 0.0
	400	ENDIF
	401
	402	IF ( ln_dyninc ) THEN
	403	CALL iom_get( inum, jpdom_autoglo, 'bckinu', u_bkginc, 1 )
	404	CALL iom_get( inum, jpdom_autoglo, 'bckinv', v_bkginc, 1 )
	405	! Apply the masks
	406	u_bkginc(:,:,:) = u_bkginc(:,:,:) * umask(:,:,:)
	407	v_bkginc(:,:,:) = v_bkginc(:,:,:) * vmask(:,:,:)
	408	! Set missing increments to 0.0 rather than 1e+20
	409	! to allow for differences in masks
	410	WHERE( ABS( u_bkginc(:,:,:) ) > 1.0e+10 ) u_bkginc(:,:,:) = 0.0
	411	WHERE( ABS( v_bkginc(:,:,:) ) > 1.0e+10 ) v_bkginc(:,:,:) = 0.0
	412	ENDIF
	413
	414	IF ( ln_sshinc ) THEN
	415	CALL iom_get( inum, jpdom_autoglo, 'bckineta', ssh_bkginc, 1 )
	416	! Apply the masks
	417	ssh_bkginc(:,:) = ssh_bkginc(:,:) * tmask(:,:,1)
	418	! Set missing increments to 0.0 rather than 1e+20
	419	! to allow for differences in masks
	420	WHERE( ABS( ssh_bkginc(:,:) ) > 1.0e+10 ) ssh_bkginc(:,:) = 0.0
	421	ENDIF
	422
[3764]	423	IF ( ln_seaiceinc ) THEN
	424	CALL iom_get( inum, jpdom_autoglo, 'bckinseaice', seaice_bkginc, 1 )
	425	! Apply the masks
	426	seaice_bkginc(:,:) = seaice_bkginc(:,:) * tmask(:,:,1)
	427	! Set missing increments to 0.0 rather than 1e+20
	428	! to allow for differences in masks
	429	WHERE( ABS( seaice_bkginc(:,:) ) > 1.0e+10 ) seaice_bkginc(:,:) = 0.0
	430	ENDIF
	431
[2128]	432	CALL iom_close( inum )
	433
	434	ENDIF
	435
	436	!-----------------------------------------------------------------------
[3294]	437	! Apply divergence damping filter
	438	!-----------------------------------------------------------------------
	439
	440	IF ( ln_dyninc .AND. nn_divdmp > 0 ) THEN
	441
[3764]	442	CALL wrk_alloc(jpi,jpj,hdiv)
[3294]	443
[3764]	444	DO jt = 1, nn_divdmp
[3294]	445
[3764]	446	DO jk = 1, jpkm1
[3294]	447
[3764]	448	hdiv(:,:) = 0._wp
[3294]	449
[3764]	450	DO jj = 2, jpjm1
	451	DO ji = fs_2, fs_jpim1 ! vector opt.
	452	hdiv(ji,jj) = &
	453	( e2u(ji ,jj ) * fse3u(ji ,jj ,jk) * u_bkginc(ji ,jj ,jk) &
	454	- e2u(ji-1,jj ) * fse3u(ji-1,jj ,jk) * u_bkginc(ji-1,jj ,jk) &
	455	+ e1v(ji ,jj ) * fse3v(ji ,jj ,jk) * v_bkginc(ji ,jj ,jk) &
	456	- e1v(ji ,jj-1) * fse3v(ji ,jj-1,jk) * v_bkginc(ji ,jj-1,jk) ) &
	457	/ ( e1t(ji,jj) * e2t(ji,jj) * fse3t(ji,jj,jk) )
	458	END DO
[3294]	459	END DO
	460
[3764]	461	CALL lbc_lnk( hdiv, 'T', 1. ) ! lateral boundary cond. (no sign change)
[3294]	462
[3764]	463	DO jj = 2, jpjm1
	464	DO ji = fs_2, fs_jpim1 ! vector opt.
	465	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) &
	466	- e1t(ji ,jj)e2t(ji ,jj) hdiv(ji ,jj) ) &
	467	/ e1u(ji,jj) * umask(ji,jj,jk)
	468	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) &
	469	- e1t(ji,jj )e2t(ji,jj ) hdiv(ji,jj ) ) &
	470	/ e2v(ji,jj) * vmask(ji,jj,jk)
	471	END DO
[3294]	472	END DO
[3764]	473
[3294]	474	END DO
	475
[3764]	476	END DO
[3294]	477
[3764]	478	CALL wrk_dealloc(jpi,jpj,hdiv)
[3294]	479
	480	ENDIF
	481
	482
	483
	484	!-----------------------------------------------------------------------
[2128]	485	! Allocate and initialize the background state arrays
	486	!-----------------------------------------------------------------------
	487
	488	IF ( ln_asmdin ) THEN
	489
	490	ALLOCATE( t_bkg(jpi,jpj,jpk) )
	491	ALLOCATE( s_bkg(jpi,jpj,jpk) )
	492	ALLOCATE( u_bkg(jpi,jpj,jpk) )
	493	ALLOCATE( v_bkg(jpi,jpj,jpk) )
	494	ALLOCATE( ssh_bkg(jpi,jpj) )
	495
	496	t_bkg(:,:,:) = 0.0
	497	s_bkg(:,:,:) = 0.0
	498	u_bkg(:,:,:) = 0.0
	499	v_bkg(:,:,:) = 0.0
	500	ssh_bkg(:,:) = 0.0
	501
	502	!--------------------------------------------------------------------
	503	! Read from file the background state at analysis time
	504	!--------------------------------------------------------------------
	505
	506	CALL iom_open( c_asmdin, inum )
	507
[3764]	508	CALL iom_get( inum, 'rdastp', zdate_bkg )
[2128]	509
	510	IF(lwp) THEN
	511	WRITE(numout,*)
	512	WRITE(numout,*) 'asm_inc_init : Assimilation background state valid at : ', &
[4811]	513	& zdate_bkg
[2128]	514	WRITE(numout,*) '~~~~~~~~~~~~'
	515	ENDIF
	516
[4811]	517	IF ( zdate_bkg /= ditdin_date ) &
[2128]	518	& CALL ctl_warn( ' Validity time of assimilation background state does', &
	519	& ' not agree with Direct Initialization time' )
	520
	521	IF ( ln_trainc ) THEN
	522	CALL iom_get( inum, jpdom_autoglo, 'tn', t_bkg )
	523	CALL iom_get( inum, jpdom_autoglo, 'sn', s_bkg )
	524	t_bkg(:,:,:) = t_bkg(:,:,:) * tmask(:,:,:)
	525	s_bkg(:,:,:) = s_bkg(:,:,:) * tmask(:,:,:)
	526	ENDIF
	527
	528	IF ( ln_dyninc ) THEN
	529	CALL iom_get( inum, jpdom_autoglo, 'un', u_bkg )
	530	CALL iom_get( inum, jpdom_autoglo, 'vn', v_bkg )
	531	u_bkg(:,:,:) = u_bkg(:,:,:) * umask(:,:,:)
	532	v_bkg(:,:,:) = v_bkg(:,:,:) * vmask(:,:,:)
	533	ENDIF
	534
	535	IF ( ln_sshinc ) THEN
	536	CALL iom_get( inum, jpdom_autoglo, 'sshn', ssh_bkg )
	537	ssh_bkg(:,:) = ssh_bkg(:,:) * tmask(:,:,1)
	538	ENDIF
	539
	540	CALL iom_close( inum )
	541
	542	ENDIF
[2392]	543	!
[2128]	544	END SUBROUTINE asm_inc_init
	545
	546	SUBROUTINE tra_asm_inc( kt )
	547	!!----------------------------------------------------------------------
	548	!! * ROUTINE tra_asm_inc *
	549	!!
	550	!! ** Purpose : Apply the tracer (T and S) assimilation increments
	551	!!
	552	!! ** Method : Direct initialization or Incremental Analysis Updating
	553	!!
	554	!! ** Action :
	555	!!----------------------------------------------------------------------
	556	INTEGER, INTENT(IN) :: kt ! Current time step
[2392]	557	!
[2128]	558	INTEGER :: ji,jj,jk
	559	INTEGER :: it
	560	REAL(wp) :: zincwgt ! IAU weight for current time step
[3764]	561	REAL (wp), DIMENSION(jpi,jpj,jpk) :: fzptnz ! 3d freezing point values
[2392]	562	!!----------------------------------------------------------------------
[2128]	563
[3764]	564	! freezing point calculation taken from oc_fz_pt (but calculated for all depths)
	565	! used to prevent the applied increments taking the temperature below the local freezing point
	566
[5075]	567	DO jk = 1, jpkm1
	568	fzptnz(:,:,jk) = eos_fzp( tsn(:,:,jk,jp_sal), fsdept(:,:,jk) )
	569	END DO
[3764]	570
[2128]	571	IF ( ln_asmiau ) THEN
	572
	573	!--------------------------------------------------------------------
	574	! Incremental Analysis Updating
	575	!--------------------------------------------------------------------
	576
	577	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	578
	579	it = kt - nit000 + 1
	580	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
	581
	582	IF(lwp) THEN
	583	WRITE(numout,*)
[5075]	584	WRITE(numout,*) 'tra_asm_inc : Tracer IAU at time step = ', kt,' with IAU weight = ', wgtiau(it)
[2128]	585	WRITE(numout,*) '~~~~~~~~~~~~'
	586	ENDIF
	587
	588	! Update the tracer tendencies
	589	DO jk = 1, jpkm1
[3764]	590	IF (ln_temnofreeze) THEN
	591	! Do not apply negative increments if the temperature will fall below freezing
	592	WHERE(t_bkginc(:,:,jk) > 0.0_wp .OR. &
	593	& tsn(:,:,jk,jp_tem) + tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * wgtiau(it) > fzptnz(:,:,jk) )
	594	tsa(:,:,jk,jp_tem) = tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * zincwgt
	595	END WHERE
	596	ELSE
	597	tsa(:,:,jk,jp_tem) = tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * zincwgt
	598	ENDIF
	599	IF (ln_salfix) THEN
	600	! Do not apply negative increments if the salinity will fall below a specified
	601	! minimum value salfixmin
	602	WHERE(s_bkginc(:,:,jk) > 0.0_wp .OR. &
	603	& tsn(:,:,jk,jp_sal) + tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * wgtiau(it) > salfixmin )
	604	tsa(:,:,jk,jp_sal) = tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * zincwgt
	605	END WHERE
	606	ELSE
	607	tsa(:,:,jk,jp_sal) = tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * zincwgt
	608	ENDIF
[2128]	609	END DO
	610
	611	ENDIF
	612
	613	IF ( kt == nitiaufin_r + 1 ) THEN ! For bias crcn to work
	614	DEALLOCATE( t_bkginc )
	615	DEALLOCATE( s_bkginc )
	616	ENDIF
	617
	618
	619	ELSEIF ( ln_asmdin ) THEN
	620
	621	!--------------------------------------------------------------------
	622	! Direct Initialization
	623	!--------------------------------------------------------------------
	624
	625	IF ( kt == nitdin_r ) THEN
	626
	627	neuler = 0 ! Force Euler forward step
	628
	629	! Initialize the now fields with the background + increment
[3764]	630	IF (ln_temnofreeze) THEN
	631	! Do not apply negative increments if the temperature will fall below freezing
[5075]	632	WHERE( t_bkginc(:,:,:) > 0.0_wp .OR. tsn(:,:,:,jp_tem) + t_bkginc(:,:,:) > fzptnz(:,:,:) )
[3764]	633	tsn(:,:,:,jp_tem) = t_bkg(:,:,:) + t_bkginc(:,:,:)
	634	END WHERE
	635	ELSE
	636	tsn(:,:,:,jp_tem) = t_bkg(:,:,:) + t_bkginc(:,:,:)
	637	ENDIF
[2128]	638	IF (ln_salfix) THEN
[3764]	639	! Do not apply negative increments if the salinity will fall below a specified
	640	! minimum value salfixmin
[5075]	641	WHERE( s_bkginc(:,:,:) > 0.0_wp .OR. tsn(:,:,:,jp_sal) + s_bkginc(:,:,:) > salfixmin )
[3764]	642	tsn(:,:,:,jp_sal) = s_bkg(:,:,:) + s_bkginc(:,:,:)
	643	END WHERE
	644	ELSE
	645	tsn(:,:,:,jp_sal) = s_bkg(:,:,:) + s_bkginc(:,:,:)
[2128]	646	ENDIF
	647
[5075]	648	tsb(:,:,:,:) = tsn(:,:,:,:) ! Update before fields
[2128]	649
[5075]	650	CALL eos( tsb, rhd, rhop, gdept_0(:,:,:) ) ! Before potential and in situ densities
	651	!!gm fabien
	652	! CALL eos( tsb, rhd, rhop ) ! Before potential and in situ densities
	653	!!gm
	654
	655
[5980]	656	IF( ln_zps .AND. .NOT. lk_c1d .AND. .NOT. ln_isfcav) &
	657	& CALL zps_hde ( kt, jpts, tsb, gtsu, gtsv, & ! Partial steps: before horizontal gradient
	658	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
	659	IF( ln_zps .AND. .NOT. lk_c1d .AND. ln_isfcav) &
	660	& CALL zps_hde_isf( nit000, jpts, tsb, gtsu, gtsv, & ! Partial steps for top cell (ISF)
	661	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
	662	& gtui, gtvi, grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi ) ! of t, s, rd at the last ocean level
[2128]	663
[3764]	664	#if defined key_zdfkpp
[4313]	665	CALL eos( tsn, rhd, fsdept_n(:,:,:) ) ! Compute rhd
[5075]	666	!!gm fabien CALL eos( tsn, rhd ) ! Compute rhd
[3764]	667	#endif
	668
[2128]	669	DEALLOCATE( t_bkginc )
	670	DEALLOCATE( s_bkginc )
	671	DEALLOCATE( t_bkg )
	672	DEALLOCATE( s_bkg )
	673	ENDIF
[2392]	674	!
[2128]	675	ENDIF
[3764]	676	! Perhaps the following call should be in step
	677	IF ( ln_seaiceinc ) CALL seaice_asm_inc ( kt ) ! apply sea ice concentration increment
[2392]	678	!
[2128]	679	END SUBROUTINE tra_asm_inc
	680
[2392]	681
[2128]	682	SUBROUTINE dyn_asm_inc( kt )
	683	!!----------------------------------------------------------------------
	684	!! * ROUTINE dyn_asm_inc *
	685	!!
	686	!! ** Purpose : Apply the dynamics (u and v) assimilation increments.
	687	!!
	688	!! ** Method : Direct initialization or Incremental Analysis Updating.
	689	!!
	690	!! ** Action :
	691	!!----------------------------------------------------------------------
	692	INTEGER, INTENT(IN) :: kt ! Current time step
[2392]	693	!
[2128]	694	INTEGER :: jk
	695	INTEGER :: it
	696	REAL(wp) :: zincwgt ! IAU weight for current time step
[2392]	697	!!----------------------------------------------------------------------
[2128]	698
	699	IF ( ln_asmiau ) THEN
	700
	701	!--------------------------------------------------------------------
	702	! Incremental Analysis Updating
	703	!--------------------------------------------------------------------
	704
	705	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	706
	707	it = kt - nit000 + 1
	708	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
	709
	710	IF(lwp) THEN
	711	WRITE(numout,*)
	712	WRITE(numout,*) 'dyn_asm_inc : Dynamics IAU at time step = ', &
	713	& kt,' with IAU weight = ', wgtiau(it)
	714	WRITE(numout,*) '~~~~~~~~~~~~'
	715	ENDIF
	716
	717	! Update the dynamic tendencies
	718	DO jk = 1, jpkm1
	719	ua(:,:,jk) = ua(:,:,jk) + u_bkginc(:,:,jk) * zincwgt
	720	va(:,:,jk) = va(:,:,jk) + v_bkginc(:,:,jk) * zincwgt
	721	END DO
	722
	723	IF ( kt == nitiaufin_r ) THEN
	724	DEALLOCATE( u_bkginc )
	725	DEALLOCATE( v_bkginc )
	726	ENDIF
	727
	728	ENDIF
	729
	730	ELSEIF ( ln_asmdin ) THEN
	731
	732	!--------------------------------------------------------------------
	733	! Direct Initialization
	734	!--------------------------------------------------------------------
	735
	736	IF ( kt == nitdin_r ) THEN
	737
	738	neuler = 0 ! Force Euler forward step
	739
	740	! Initialize the now fields with the background + increment
	741	un(:,:,:) = u_bkg(:,:,:) + u_bkginc(:,:,:)
	742	vn(:,:,:) = v_bkg(:,:,:) + v_bkginc(:,:,:)
	743
	744	ub(:,:,:) = un(:,:,:) ! Update before fields
	745	vb(:,:,:) = vn(:,:,:)
	746
	747	DEALLOCATE( u_bkg )
	748	DEALLOCATE( v_bkg )
	749	DEALLOCATE( u_bkginc )
	750	DEALLOCATE( v_bkginc )
	751	ENDIF
[2392]	752	!
[2128]	753	ENDIF
[2392]	754	!
[2128]	755	END SUBROUTINE dyn_asm_inc
	756
[2392]	757
[2128]	758	SUBROUTINE ssh_asm_inc( kt )
	759	!!----------------------------------------------------------------------
	760	!! * ROUTINE ssh_asm_inc *
	761	!!
	762	!! ** Purpose : Apply the sea surface height assimilation increment.
	763	!!
	764	!! ** Method : Direct initialization or Incremental Analysis Updating.
	765	!!
	766	!! ** Action :
	767	!!----------------------------------------------------------------------
	768	INTEGER, INTENT(IN) :: kt ! Current time step
[2392]	769	!
[2128]	770	INTEGER :: it
[3764]	771	INTEGER :: jk
[2128]	772	REAL(wp) :: zincwgt ! IAU weight for current time step
[2392]	773	!!----------------------------------------------------------------------
[2128]	774
	775	IF ( ln_asmiau ) THEN
	776
	777	!--------------------------------------------------------------------
	778	! Incremental Analysis Updating
	779	!--------------------------------------------------------------------
	780
	781	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	782
	783	it = kt - nit000 + 1
	784	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
	785
	786	IF(lwp) THEN
	787	WRITE(numout,*)
	788	WRITE(numout,*) 'ssh_asm_inc : SSH IAU at time step = ', &
	789	& kt,' with IAU weight = ', wgtiau(it)
	790	WRITE(numout,*) '~~~~~~~~~~~~'
	791	ENDIF
	792
	793	! Save the tendency associated with the IAU weighted SSH increment
	794	! (applied in dynspg.*)
	795	#if defined key_asminc
	796	ssh_iau(:,:) = ssh_bkginc(:,:) * zincwgt
	797	#endif
	798	IF ( kt == nitiaufin_r ) THEN
	799	DEALLOCATE( ssh_bkginc )
	800	ENDIF
	801
	802	ENDIF
	803
	804	ELSEIF ( ln_asmdin ) THEN
	805
	806	!--------------------------------------------------------------------
	807	! Direct Initialization
	808	!--------------------------------------------------------------------
	809
	810	IF ( kt == nitdin_r ) THEN
	811
	812	neuler = 0 ! Force Euler forward step
	813
	814	! Initialize the now fields the background + increment
	815	sshn(:,:) = ssh_bkg(:,:) + ssh_bkginc(:,:)
	816
[3764]	817	! Update before fields
	818	sshb(:,:) = sshn(:,:)
[2128]	819
[3764]	820	IF( lk_vvl ) THEN
	821	DO jk = 1, jpk
	822	fse3t_b(:,:,jk) = fse3t_n(:,:,jk)
	823	END DO
	824	ENDIF
	825
[2128]	826	DEALLOCATE( ssh_bkg )
	827	DEALLOCATE( ssh_bkginc )
	828
	829	ENDIF
[2392]	830	!
[2128]	831	ENDIF
[2392]	832	!
[2128]	833	END SUBROUTINE ssh_asm_inc
	834
[3785]	835
[3764]	836	SUBROUTINE seaice_asm_inc( kt, kindic )
	837	!!----------------------------------------------------------------------
	838	!! * ROUTINE seaice_asm_inc *
	839	!!
	840	!! ** Purpose : Apply the sea ice assimilation increment.
	841	!!
	842	!! ** Method : Direct initialization or Incremental Analysis Updating.
	843	!!
	844	!! ** Action :
	845	!!
	846	!!----------------------------------------------------------------------
	847	IMPLICIT NONE
[3785]	848	!
	849	INTEGER, INTENT(in) :: kt ! Current time step
	850	INTEGER, INTENT(in), OPTIONAL :: kindic ! flag for disabling the deallocation
	851	!
	852	INTEGER :: it
	853	REAL(wp) :: zincwgt ! IAU weight for current time step
	854	#if defined key_lim2
	855	REAL(wp), DIMENSION(jpi,jpj) :: zofrld, zohicif, zseaicendg, zhicifinc ! LIM
	856	REAL(wp) :: zhicifmin = 0.5_wp ! ice minimum depth in metres
[3764]	857	#endif
[3785]	858	!!----------------------------------------------------------------------
[3764]	859
	860	IF ( ln_asmiau ) THEN
	861
	862	!--------------------------------------------------------------------
	863	! Incremental Analysis Updating
	864	!--------------------------------------------------------------------
	865
	866	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
	867
	868	it = kt - nit000 + 1
	869	zincwgt = wgtiau(it) ! IAU weight for the current time step
	870	! note this is not a tendency so should not be divided by rdt (as with the tracer and other increments)
	871
	872	IF(lwp) THEN
	873	WRITE(numout,*)
	874	WRITE(numout,*) 'seaice_asm_inc : sea ice conc IAU at time step = ', &
	875	& kt,' with IAU weight = ', wgtiau(it)
	876	WRITE(numout,*) '~~~~~~~~~~~~'
	877	ENDIF
	878
[3785]	879	! Sea-ice : LIM-3 case (to add)
[3764]	880
[3785]	881	#if defined key_lim2
	882	! Sea-ice : LIM-2 case
	883	zofrld (:,:) = frld(:,:)
	884	zohicif(:,:) = hicif(:,:)
	885	!
	886	frld = MIN( MAX( frld (:,:) - seaice_bkginc(:,:) * zincwgt, 0.0_wp), 1.0_wp)
[3764]	887	pfrld = MIN( MAX( pfrld(:,:) - seaice_bkginc(:,:) * zincwgt, 0.0_wp), 1.0_wp)
	888	fr_i(:,:) = 1.0_wp - frld(:,:) ! adjust ice fraction
[3785]	889	!
	890	zseaicendg(:,:) = zofrld(:,:) - frld(:,:) ! find out actual sea ice nudge applied
	891	!
[3764]	892	! Nudge sea ice depth to bring it up to a required minimum depth
	893	WHERE( zseaicendg(:,:) > 0.0_wp .AND. hicif(:,:) < zhicifmin )
	894	zhicifinc(:,:) = (zhicifmin - hicif(:,:)) * zincwgt
	895	ELSEWHERE
	896	zhicifinc(:,:) = 0.0_wp
	897	END WHERE
[3785]	898	!
	899	! nudge ice depth
	900	hicif (:,:) = hicif (:,:) + zhicifinc(:,:)
	901	phicif(:,:) = phicif(:,:) + zhicifinc(:,:)
	902	!
	903	! seaice salinity balancing (to add)
[3764]	904	#endif
	905
[4245]	906	#if defined key_cice && defined key_asminc
[3785]	907	! Sea-ice : CICE case. Pass ice increment tendency into CICE
[3764]	908	ndaice_da(:,:) = seaice_bkginc(:,:) * zincwgt / rdt
	909	#endif
	910
	911	IF ( kt == nitiaufin_r ) THEN
	912	DEALLOCATE( seaice_bkginc )
	913	ENDIF
	914
	915	ELSE
	916
[4245]	917	#if defined key_cice && defined key_asminc
[3785]	918	! Sea-ice : CICE case. Zero ice increment tendency into CICE
[3764]	919	ndaice_da(:,:) = 0.0_wp
	920	#endif
	921
	922	ENDIF
	923
	924	ELSEIF ( ln_asmdin ) THEN
	925
	926	!--------------------------------------------------------------------
	927	! Direct Initialization
	928	!--------------------------------------------------------------------
	929
	930	IF ( kt == nitdin_r ) THEN
	931
	932	neuler = 0 ! Force Euler forward step
	933
[3785]	934	! Sea-ice : LIM-3 case (to add)
[3764]	935
[3785]	936	#if defined key_lim2
	937	! Sea-ice : LIM-2 case.
[3764]	938	zofrld(:,:)=frld(:,:)
	939	zohicif(:,:)=hicif(:,:)
[3785]	940	!
[3764]	941	! Initialize the now fields the background + increment
[3785]	942	frld (:,:) = MIN( MAX( frld(:,:) - seaice_bkginc(:,:), 0.0_wp), 1.0_wp)
[3764]	943	pfrld(:,:) = frld(:,:)
[3785]	944	fr_i (:,:) = 1.0_wp - frld(:,:) ! adjust ice fraction
	945	zseaicendg(:,:) = zofrld(:,:) - frld(:,:) ! find out actual sea ice nudge applied
	946	!
[3764]	947	! Nudge sea ice depth to bring it up to a required minimum depth
	948	WHERE( zseaicendg(:,:) > 0.0_wp .AND. hicif(:,:) < zhicifmin )
	949	zhicifinc(:,:) = (zhicifmin - hicif(:,:)) * zincwgt
	950	ELSEWHERE
	951	zhicifinc(:,:) = 0.0_wp
	952	END WHERE
[3785]	953	!
	954	! nudge ice depth
	955	hicif (:,:) = hicif (:,:) + zhicifinc(:,:)
	956	phicif(:,:) = phicif(:,:)
	957	!
	958	! seaice salinity balancing (to add)
[3764]	959	#endif
	960
[4245]	961	#if defined key_cice && defined key_asminc
	962	! Sea-ice : CICE case. Pass ice increment tendency into CICE
[3764]	963	ndaice_da(:,:) = seaice_bkginc(:,:) / rdt
	964	#endif
	965	IF ( .NOT. PRESENT(kindic) ) THEN
	966	DEALLOCATE( seaice_bkginc )
	967	END IF
	968
	969	ELSE
	970
[4245]	971	#if defined key_cice && defined key_asminc
[3785]	972	! Sea-ice : CICE case. Zero ice increment tendency into CICE
[3764]	973	ndaice_da(:,:) = 0.0_wp
	974	#endif
	975
	976	ENDIF
	977
[3785]	978	!#if defined defined key_lim2 \|\| defined key_cice
[3764]	979	!
	980	! IF (ln_seaicebal ) THEN
	981	! !! balancing salinity increments
	982	! !! simple case from limflx.F90 (doesn't include a mass flux)
	983	! !! assumption is that as ice concentration is reduced or increased
	984	! !! the snow and ice depths remain constant
	985	! !! note that snow is being created where ice concentration is being increased
	986	! !! - could be more sophisticated and
	987	! !! not do this (but would need to alter h_snow)
	988	!
	989	! usave(:,:,:)=sb(:,:,:) ! use array as a temporary store
	990	!
	991	! DO jj = 1, jpj
	992	! DO ji = 1, jpi
	993	! ! calculate change in ice and snow mass per unit area
	994	! ! positive values imply adding salt to the ocean (results from ice formation)
	995	! ! fwf : ice formation and melting
	996	!
	997	! zfons = ( -nfresh_da(ji,jj)soce + nfsalt_da(ji,jj) )rdt
	998	!
	999	! ! change salinity down to mixed layer depth
	1000	! mld=hmld_kara(ji,jj)
	1001	!
	1002	! ! prevent small mld
	1003	! ! less than 10m can cause salinity instability
	1004	! IF (mld < 10) mld=10
	1005	!
	1006	! ! set to bottom of a level
	1007	! DO jk = jpk-1, 2, -1
	1008	! IF ((mld > gdepw(ji,jj,jk)) .and. (mld < gdepw(ji,jj,jk+1))) THEN
	1009	! mld=gdepw(ji,jj,jk+1)
	1010	! jkmax=jk
	1011	! ENDIF
	1012	! ENDDO
	1013	!
	1014	! ! avoid applying salinity balancing in shallow water or on land
	1015	! !
	1016	!
	1017	! ! dsal_ocn (psu kg m^-2) / (kg m^-3 * m)
	1018	!
	1019	! dsal_ocn=0.0_wp
	1020	! sal_thresh=5.0_wp ! minimum salinity threshold for salinity balancing
	1021	!
	1022	! if (tmask(ji,jj,1) > 0 .AND. tmask(ji,jj,jkmax) > 0 ) &
	1023	! dsal_ocn = zfons / (rhop(ji,jj,1) * mld)
	1024	!
	1025	! ! put increments in for levels in the mixed layer
	1026	! ! but prevent salinity below a threshold value
	1027	!
	1028	! DO jk = 1, jkmax
	1029	!
	1030	! IF (dsal_ocn > 0.0_wp .or. sb(ji,jj,jk)+dsal_ocn > sal_thresh) THEN
	1031	! sb(ji,jj,jk) = sb(ji,jj,jk) + dsal_ocn
	1032	! sn(ji,jj,jk) = sn(ji,jj,jk) + dsal_ocn
	1033	! ENDIF
	1034	!
	1035	! ENDDO
	1036	!
	1037	! ! ! salt exchanges at the ice/ocean interface
	1038	! ! zpmess = zfons / rdt_ice ! rdt_ice is ice timestep
	1039	! !
	1040	! !! Adjust fsalt. A +ve fsalt means adding salt to ocean
	1041	! !! fsalt(ji,jj) = fsalt(ji,jj) + zpmess ! adjust fsalt
	1042	! !!
	1043	! !! emps(ji,jj) = emps(ji,jj) + zpmess ! or adjust emps (see icestp1d)
	1044	! !! ! E-P (kg m-2 s-2)
	1045	! ! emp(ji,jj) = emp(ji,jj) + zpmess ! E-P (kg m-2 s-2)
	1046	! ENDDO !ji
	1047	! ENDDO !jj!
	1048	!
	1049	! ENDIF !ln_seaicebal
	1050	!
	1051	!#endif
	1052
	1053	ENDIF
	1054
	1055	END SUBROUTINE seaice_asm_inc
[3785]	1056
[2392]	1057	!!======================================================================
[2128]	1058	END MODULE asminc

Note: See TracBrowser for help on using the repository browser.

Download in other formats: