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dynspg_ts.F90 in NEMO/branches/2019/dev_r10973_AGRIF-01_jchanut_small_jpi_jpj/src/OCE/DYN – NEMO

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source: NEMO/branches/2019/dev_r10973_AGRIF-01_jchanut_small_jpi_jpj/src/OCE/DYN/dynspg_ts.F90 @ 11205

Last change on this file since 11205 was 11205, checked in by jchanut, 5 years ago
#2199 1) Make sponge independent of sub-domain size. Partially masked open boundary segments are not taken into account anymore. To do so, sponge coefficients should be read in a file for realistic applications (then nesting tools need to be modified accordingly). 2) Replace East-West-North-South barotropic data arrays by a global 2d array. Then apply barotropic open boundary conditions thanks to mi0/mi1, mj0/mj1 indexes. 3) Call AGRIF bdy update one more time in dynspg_ts during extrapolation phase. This removes a dozen lines of code in dynspg_ts routine.
Property svn:keywords set to `Id`
File size: 75.9 KB

Rev	Line
[358]	1	MODULE dynspg_ts
[9023]	2
	3	!! Includes ROMS wd scheme with diagnostic outputs ; un and ua updates are commented out !
	4
[358]	5	!!======================================================================
[6140]	6	!! * MODULE dynspg_ts *
	7	!! Ocean dynamics: surface pressure gradient trend, split-explicit scheme
	8	!!======================================================================
[1502]	9	!! History : 1.0 ! 2004-12 (L. Bessieres, G. Madec) Original code
	10	!! - ! 2005-11 (V. Garnier, G. Madec) optimization
	11	!! - ! 2006-08 (S. Masson) distributed restart using iom
	12	!! 2.0 ! 2007-07 (D. Storkey) calls to BDY routines
	13	!! - ! 2008-01 (R. Benshila) change averaging method
	14	!! 3.2 ! 2009-07 (R. Benshila, G. Madec) Complete revisit associated to vvl reactivation
[2528]	15	!! 3.3 ! 2010-09 (D. Storkey, E. O'Dea) update for BDY for Shelf configurations
[2724]	16	!! 3.3 ! 2011-03 (R. Benshila, R. Hordoir, P. Oddo) update calculation of ub_b
[4292]	17	!! 3.5 ! 2013-07 (J. Chanut) Switch to Forward-backward time stepping
	18	!! 3.6 ! 2013-11 (A. Coward) Update for z-tilde compatibility
[5930]	19	!! 3.7 ! 2015-11 (J. Chanut) free surface simplification
[7646]	20	!! - ! 2016-12 (G. Madec, E. Clementi) update for Stoke-Drift divergence
[9019]	21	!! 4.0 ! 2017-05 (G. Madec) drag coef. defined at t-point (zdfdrg.F90)
[2724]	22	!!---------------------------------------------------------------------
[6140]	23
[358]	24	!!----------------------------------------------------------------------
[6140]	25	!! dyn_spg_ts : compute surface pressure gradient trend using a time-splitting scheme
	26	!! dyn_spg_ts_init: initialisation of the time-splitting scheme
	27	!! ts_wgt : set time-splitting weights for temporal averaging (or not)
	28	!! ts_rst : read/write time-splitting fields in restart file
[358]	29	!!----------------------------------------------------------------------
	30	USE oce ! ocean dynamics and tracers
	31	USE dom_oce ! ocean space and time domain
[888]	32	USE sbc_oce ! surface boundary condition: ocean
[9019]	33	USE zdf_oce ! vertical physics: variables
	34	USE zdfdrg ! vertical physics: top/bottom drag coef.
[5120]	35	USE sbcisf ! ice shelf variable (fwfisf)
[6140]	36	USE sbcapr ! surface boundary condition: atmospheric pressure
	37	USE dynadv , ONLY: ln_dynadv_vec
[9528]	38	USE dynvor ! vortivity scheme indicators
[358]	39	USE phycst ! physical constants
	40	USE dynvor ! vorticity term
[6152]	41	USE wet_dry ! wetting/drying flux limter
[7646]	42	USE bdy_oce ! open boundary
[10481]	43	USE bdyvol ! open boundary volume conservation
[5930]	44	USE bdytides ! open boundary condition data
[3294]	45	USE bdydyn2d ! open boundary conditions on barotropic variables
[4292]	46	USE sbctide ! tides
	47	USE updtide ! tide potential
[7646]	48	USE sbcwave ! surface wave
[9019]	49	USE diatmb ! Top,middle,bottom output
	50	#if defined key_agrif
[9570]	51	USE agrif_oce_interp ! agrif
[9124]	52	USE agrif_oce
[9019]	53	#endif
	54	#if defined key_asminc
	55	USE asminc ! Assimilation increment
	56	#endif
[6140]	57	!
	58	USE in_out_manager ! I/O manager
[358]	59	USE lib_mpp ! distributed memory computing library
	60	USE lbclnk ! ocean lateral boundary conditions (or mpp link)
	61	USE prtctl ! Print control
[2715]	62	USE iom ! IOM library
[4292]	63	USE restart ! only for lrst_oce
[9023]	64	USE diatmb ! Top,middle,bottom output
[358]	65
	66	IMPLICIT NONE
	67	PRIVATE
	68
[9124]	69	PUBLIC dyn_spg_ts ! called by dyn_spg
	70	PUBLIC dyn_spg_ts_init ! - - dyn_spg_init
[358]	71
[9019]	72	!! Time filtered arrays at baroclinic time step:
	73	REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: un_adv , vn_adv !: Advection vel. at "now" barocl. step
[9124]	74	!
[9023]	75	INTEGER, SAVE :: icycle ! Number of barotropic sub-steps for each internal step nn_baro <= 2.5 nn_baro
	76	REAL(wp),SAVE :: rdtbt ! Barotropic time step
[9019]	77	!
	78	REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:) :: wgtbtp1, wgtbtp2 ! 1st & 2nd weights used in time filtering of barotropic fields
[9124]	79	REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: zwz ! ff_f/h at F points
	80	REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: ftnw, ftne ! triad of coriolis parameter
	81	REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: ftsw, ftse ! (only used with een vorticity scheme)
[4292]	82
[9043]	83	REAL(wp) :: r1_12 = 1._wp / 12._wp ! local ratios
	84	REAL(wp) :: r1_8 = 0.125_wp !
	85	REAL(wp) :: r1_4 = 0.25_wp !
	86	REAL(wp) :: r1_2 = 0.5_wp !
[508]	87
[358]	88	!! * Substitutions
	89	# include "vectopt_loop_substitute.h90"
[2715]	90	!!----------------------------------------------------------------------
[9598]	91	!! NEMO/OCE 4.0 , NEMO Consortium (2018)
[5217]	92	!! $Id$
[10068]	93	!! Software governed by the CeCILL license (see ./LICENSE)
[2715]	94	!!----------------------------------------------------------------------
[358]	95	CONTAINS
	96
[2715]	97	INTEGER FUNCTION dyn_spg_ts_alloc()
	98	!!----------------------------------------------------------------------
	99	!! * routine dyn_spg_ts_alloc *
	100	!!----------------------------------------------------------------------
[6140]	101	INTEGER :: ierr(3)
[4292]	102	!!----------------------------------------------------------------------
	103	ierr(:) = 0
[6140]	104	!
	105	ALLOCATE( wgtbtp1(3nn_baro), wgtbtp2(3nn_baro), zwz(jpi,jpj), STAT=ierr(1) )
	106	!
[9528]	107	IF( ln_dynvor_een .OR. ln_dynvor_eeT ) &
	108	& ALLOCATE( ftnw(jpi,jpj) , ftne(jpi,jpj) , &
	109	& ftsw(jpi,jpj) , ftse(jpi,jpj) , STAT=ierr(2) )
[6140]	110	!
	111	ALLOCATE( un_adv(jpi,jpj), vn_adv(jpi,jpj) , STAT=ierr(3) )
	112	!
	113	dyn_spg_ts_alloc = MAXVAL( ierr(:) )
	114	!
[10425]	115	CALL mpp_sum( 'dynspg_ts', dyn_spg_ts_alloc )
	116	IF( dyn_spg_ts_alloc /= 0 ) CALL ctl_stop( 'STOP', 'dyn_spg_ts_alloc: failed to allocate arrays' )
[2715]	117	!
	118	END FUNCTION dyn_spg_ts_alloc
	119
[5836]	120
[358]	121	SUBROUTINE dyn_spg_ts( kt )
	122	!!----------------------------------------------------------------------
	123	!!
[6140]	124	!! ** Purpose : - Compute the now trend due to the explicit time stepping
	125	!! of the quasi-linear barotropic system, and add it to the
	126	!! general momentum trend.
[358]	127	!!
[6140]	128	!! ** Method : - split-explicit schem (time splitting) :
[4374]	129	!! Barotropic variables are advanced from internal time steps
	130	!! "n" to "n+1" if ln_bt_fw=T
	131	!! or from
	132	!! "n-1" to "n+1" if ln_bt_fw=F
	133	!! thanks to a generalized forward-backward time stepping (see ref. below).
[358]	134	!!
[4374]	135	!! ** Action :
	136	!! -Update the filtered free surface at step "n+1" : ssha
	137	!! -Update filtered barotropic velocities at step "n+1" : ua_b, va_b
[9023]	138	!! -Compute barotropic advective fluxes at step "n" : un_adv, vn_adv
[4374]	139	!! These are used to advect tracers and are compliant with discrete
	140	!! continuity equation taken at the baroclinic time steps. This
	141	!! ensures tracers conservation.
[6140]	142	!! - (ua, va) momentum trend updated with barotropic component.
[358]	143	!!
[6140]	144	!! References : Shchepetkin and McWilliams, Ocean Modelling, 2005.
[358]	145	!!---------------------------------------------------------------------
[1502]	146	INTEGER, INTENT(in) :: kt ! ocean time-step index
[2715]	147	!
[9554]	148	INTEGER :: ji, jj, jk, jn ! dummy loop indices
[9019]	149	LOGICAL :: ll_fw_start ! =T : forward integration
[9554]	150	LOGICAL :: ll_init ! =T : special startup of 2d equations
[9019]	151	LOGICAL :: ll_tmp1, ll_tmp2 ! local logical variables used in W/D
	152	INTEGER :: ikbu, iktu, noffset ! local integers
	153	INTEGER :: ikbv, iktv ! - -
[9554]	154	REAL(wp) :: r1_2dt_b, z2dt_bf ! local scalars
[9528]	155	REAL(wp) :: zx1, zx2, zu_spg, zhura, z1_hu ! - -
	156	REAL(wp) :: zy1, zy2, zv_spg, zhvra, z1_hv ! - -
	157	REAL(wp) :: za0, za1, za2, za3 ! - -
	158	REAL(wp) :: zmdi, zztmp , z1_ht ! - -
[9019]	159	REAL(wp), DIMENSION(jpi,jpj) :: zsshp2_e, zhf
	160	REAL(wp), DIMENSION(jpi,jpj) :: zwx, zu_trd, zu_frc, zssh_frc
	161	REAL(wp), DIMENSION(jpi,jpj) :: zwy, zv_trd, zv_frc, zhdiv
[9528]	162	REAL(wp), DIMENSION(jpi,jpj) :: zsshu_a, zhup2_e, zhust_e, zhtp2_e
[9019]	163	REAL(wp), DIMENSION(jpi,jpj) :: zsshv_a, zhvp2_e, zhvst_e
	164	REAL(wp), DIMENSION(jpi,jpj) :: zCdU_u, zCdU_v ! top/bottom stress at u- & v-points
[3294]	165	!
[9023]	166	REAL(wp) :: zwdramp ! local scalar - only used if ln_wd_dl = .True.
	167
	168	INTEGER :: iwdg, jwdg, kwdg ! short-hand values for the indices of the output point
	169
	170	REAL(wp) :: zepsilon, zgamma ! - -
[9019]	171	REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zcpx, zcpy ! Wetting/Dying gravity filter coef.
[9023]	172	REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: ztwdmask, zuwdmask, zvwdmask ! ROMS wetting and drying masks at t,u,v points
	173	REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zuwdav2, zvwdav2 ! averages over the sub-steps of zuwdmask and zvwdmask
[358]	174	!!----------------------------------------------------------------------
[3294]	175	!
[9023]	176	IF( ln_wd_il ) ALLOCATE( zcpx(jpi,jpj), zcpy(jpi,jpj) )
	177	! !* Allocate temporary arrays
	178	IF( ln_wd_dl ) ALLOCATE( ztwdmask(jpi,jpj), zuwdmask(jpi,jpj), zvwdmask(jpi,jpj), zuwdav2(jpi,jpj), zvwdav2(jpi,jpj))
[3294]	179	!
[6140]	180	zmdi=1.e+20 ! missing data indicator for masking
[9019]	181	!
[9023]	182	zwdramp = r_rn_wdmin1 ! simplest ramp
	183	! zwdramp = 1._wp / (rn_wdmin2 - rn_wdmin1) ! more general ramp
	184	! ! reciprocal of baroclinic time step
[6140]	185	IF( kt == nit000 .AND. neuler == 0 ) THEN ; z2dt_bf = rdt
	186	ELSE ; z2dt_bf = 2.0_wp * rdt
[4292]	187	ENDIF
[9043]	188	r1_2dt_b = 1.0_wp / z2dt_bf
[4292]	189	!
[9023]	190	ll_init = ln_bt_av ! if no time averaging, then no specific restart
[4292]	191	ll_fw_start = .FALSE.
[9023]	192	! ! time offset in steps for bdy data update
[6140]	193	IF( .NOT.ln_bt_fw ) THEN ; noffset = - nn_baro
	194	ELSE ; noffset = 0
	195	ENDIF
[4292]	196	!
[9023]	197	IF( kt == nit000 ) THEN !* initialisation
[508]	198	!
[358]	199	IF(lwp) WRITE(numout,*)
	200	IF(lwp) WRITE(numout,*) 'dyn_spg_ts : surface pressure gradient trend'
	201	IF(lwp) WRITE(numout,*) '~~~~~~~~~~ free surface with time splitting'
[4354]	202	IF(lwp) WRITE(numout,*)
[1502]	203	!
[6140]	204	IF( neuler == 0 ) ll_init=.TRUE.
[1502]	205	!
[6140]	206	IF( ln_bt_fw .OR. neuler == 0 ) THEN
	207	ll_fw_start =.TRUE.
	208	noffset = 0
[4292]	209	ELSE
[6140]	210	ll_fw_start =.FALSE.
[4292]	211	ENDIF
	212	!
	213	! Set averaging weights and cycle length:
[6140]	214	CALL ts_wgt( ln_bt_av, ll_fw_start, icycle, wgtbtp1, wgtbtp2 )
[4292]	215	!
	216	ENDIF
	217	!
[9019]	218	IF( ln_isfcav ) THEN ! top+bottom friction (ocean cavities)
	219	DO jj = 2, jpjm1
	220	DO ji = fs_2, fs_jpim1 ! vector opt.
[9112]	221	zCdU_u(ji,jj) = r1_2*( rCdU_bot(ji+1,jj)+rCdU_bot(ji,jj) + rCdU_top(ji+1,jj)+rCdU_top(ji,jj) )
	222	zCdU_v(ji,jj) = r1_2*( rCdU_bot(ji,jj+1)+rCdU_bot(ji,jj) + rCdU_top(ji,jj+1)+rCdU_top(ji,jj) )
[9019]	223	END DO
	224	END DO
	225	ELSE ! bottom friction only
	226	DO jj = 2, jpjm1
	227	DO ji = fs_2, fs_jpim1 ! vector opt.
[9112]	228	zCdU_u(ji,jj) = r1_2*( rCdU_bot(ji+1,jj)+rCdU_bot(ji,jj) )
	229	zCdU_v(ji,jj) = r1_2*( rCdU_bot(ji,jj+1)+rCdU_bot(ji,jj) )
[9019]	230	END DO
	231	END DO
	232	ENDIF
	233	!
[4292]	234	! Set arrays to remove/compute coriolis trend.
	235	! Do it once at kt=nit000 if volume is fixed, else at each long time step.
	236	! Note that these arrays are also used during barotropic loop. These are however frozen
[4374]	237	! although they should be updated in the variable volume case. Not a big approximation.
[4292]	238	! To remove this approximation, copy lines below inside barotropic loop
[4374]	239	! and update depths at T-F points (ht and zhf resp.) at each barotropic time step
[4292]	240	!
[6140]	241	IF( kt == nit000 .OR. .NOT.ln_linssh ) THEN
[9528]	242	!
	243	SELECT CASE( nvor_scheme )
	244	CASE( np_EEN ) != EEN scheme using e3f (energy & enstrophy scheme)
[7646]	245	SELECT CASE( nn_een_e3f ) !* ff_f/e3 at F-point
[5836]	246	CASE ( 0 ) ! original formulation (masked averaging of e3t divided by 4)
	247	DO jj = 1, jpjm1
	248	DO ji = 1, jpim1
[6140]	249	zwz(ji,jj) = ( ht_n(ji ,jj+1) + ht_n(ji+1,jj+1) + &
	250	& ht_n(ji ,jj ) + ht_n(ji+1,jj ) ) * 0.25_wp
[7646]	251	IF( zwz(ji,jj) /= 0._wp ) zwz(ji,jj) = ff_f(ji,jj) / zwz(ji,jj)
[5836]	252	END DO
[5032]	253	END DO
[5836]	254	CASE ( 1 ) ! new formulation (masked averaging of e3t divided by the sum of mask)
	255	DO jj = 1, jpjm1
	256	DO ji = 1, jpim1
[9528]	257	zwz(ji,jj) = ( ht_n (ji ,jj+1) + ht_n (ji+1,jj+1) &
	258	& + ht_n (ji ,jj ) + ht_n (ji+1,jj ) ) &
	259	& / ( MAX( 1._wp, ssmask(ji ,jj+1) + ssmask(ji+1,jj+1) &
	260	& + ssmask(ji ,jj ) + ssmask(ji+1,jj ) ) )
[7646]	261	IF( zwz(ji,jj) /= 0._wp ) zwz(ji,jj) = ff_f(ji,jj) / zwz(ji,jj)
[5836]	262	END DO
[4292]	263	END DO
[5836]	264	END SELECT
[10425]	265	CALL lbc_lnk( 'dynspg_ts', zwz, 'F', 1._wp )
[5836]	266	!
[7753]	267	ftne(1,:) = 0._wp ; ftnw(1,:) = 0._wp ; ftse(1,:) = 0._wp ; ftsw(1,:) = 0._wp
[358]	268	DO jj = 2, jpj
[5836]	269	DO ji = 2, jpi
[4292]	270	ftne(ji,jj) = zwz(ji-1,jj ) + zwz(ji ,jj ) + zwz(ji ,jj-1)
	271	ftnw(ji,jj) = zwz(ji-1,jj-1) + zwz(ji-1,jj ) + zwz(ji ,jj )
	272	ftse(ji,jj) = zwz(ji ,jj ) + zwz(ji ,jj-1) + zwz(ji-1,jj-1)
	273	ftsw(ji,jj) = zwz(ji ,jj-1) + zwz(ji-1,jj-1) + zwz(ji-1,jj )
[358]	274	END DO
	275	END DO
[5836]	276	!
[9528]	277	CASE( np_EET ) != EEN scheme using e3t (energy conserving scheme)
	278	ftne(1,:) = 0._wp ; ftnw(1,:) = 0._wp ; ftse(1,:) = 0._wp ; ftsw(1,:) = 0._wp
	279	DO jj = 2, jpj
	280	DO ji = 2, jpi
	281	z1_ht = ssmask(ji,jj) / ( ht_n(ji,jj) + 1._wp - ssmask(ji,jj) )
	282	ftne(ji,jj) = ( ff_f(ji-1,jj ) + ff_f(ji ,jj ) + ff_f(ji ,jj-1) ) * z1_ht
	283	ftnw(ji,jj) = ( ff_f(ji-1,jj-1) + ff_f(ji-1,jj ) + ff_f(ji ,jj ) ) * z1_ht
	284	ftse(ji,jj) = ( ff_f(ji ,jj ) + ff_f(ji ,jj-1) + ff_f(ji-1,jj-1) ) * z1_ht
	285	ftsw(ji,jj) = ( ff_f(ji ,jj-1) + ff_f(ji-1,jj-1) + ff_f(ji-1,jj ) ) * z1_ht
	286	END DO
	287	END DO
	288	!
	289	CASE( np_ENE, np_ENS , np_MIX ) != all other schemes (ENE, ENS, MIX) except ENT !
	290	!
[7753]	291	zwz(:,:) = 0._wp
	292	zhf(:,:) = 0._wp
[7646]	293
[9124]	294	!!gm assume 0 in both cases (which is almost surely WRONG ! ) as hvatf has been removed
[7646]	295	!!gm A priori a better value should be something like :
	296	!!gm zhf(i,j) = masked sum of ht(i,j) , ht(i+1,j) , ht(i,j+1) , (i+1,j+1)
	297	!!gm divided by the sum of the corresponding mask
	298	!!gm
	299	!!
[9528]	300	IF( .NOT.ln_sco ) THEN
[7646]	301
	302	!!gm agree the JC comment : this should be done in a much clear way
	303
	304	! JC: It not clear yet what should be the depth at f-points over land in z-coordinate case
	305	! Set it to zero for the time being
	306	! IF( rn_hmin < 0._wp ) THEN ; jk = - INT( rn_hmin ) ! from a nb of level
	307	! ELSE ; jk = MINLOC( gdepw_0, mask = gdepw_0 > rn_hmin, dim = 1 ) ! from a depth
	308	! ENDIF
	309	! zhf(:,:) = gdepw_0(:,:,jk+1)
[9528]	310	!
	311	ELSE
	312	!
	313	!zhf(:,:) = hbatf(:,:)
	314	DO jj = 1, jpjm1
	315	DO ji = 1, jpim1
	316	zhf(ji,jj) = ( ht_0 (ji,jj ) + ht_0 (ji+1,jj ) &
	317	& + ht_0 (ji,jj+1) + ht_0 (ji+1,jj+1) ) &
	318	& / MAX( ssmask(ji,jj ) + ssmask(ji+1,jj ) &
	319	& + ssmask(ji,jj+1) + ssmask(ji+1,jj+1) , 1._wp )
	320	END DO
	321	END DO
	322	ENDIF
	323	!
	324	DO jj = 1, jpjm1
	325	zhf(:,jj) = zhf(:,jj) * (1._wp- umask(:,jj,1) * umask(:,jj+1,1))
	326	END DO
	327	!
[4292]	328	DO jk = 1, jpkm1
	329	DO jj = 1, jpjm1
[7753]	330	zhf(:,jj) = zhf(:,jj) + e3f_n(:,jj,jk) * umask(:,jj,jk) * umask(:,jj+1,jk)
[4292]	331	END DO
	332	END DO
[10425]	333	CALL lbc_lnk( 'dynspg_ts', zhf, 'F', 1._wp )
[4292]	334	! JC: TBC. hf should be greater than 0
	335	DO jj = 1, jpj
	336	DO ji = 1, jpi
[4370]	337	IF( zhf(ji,jj) /= 0._wp ) zwz(ji,jj) = 1._wp / zhf(ji,jj) ! zhf is actually hf here but it saves an array
[4292]	338	END DO
	339	END DO
[7753]	340	zwz(:,:) = ff_f(:,:) * zwz(:,:)
[9528]	341	END SELECT
[508]	342	ENDIF
[1502]	343	!
[4292]	344	! If forward start at previous time step, and centered integration,
	345	! then update averaging weights:
[5836]	346	IF (.NOT.ln_bt_fw .AND.( neuler==0 .AND. kt==nit000+1 ) ) THEN
[4292]	347	ll_fw_start=.FALSE.
[9019]	348	CALL ts_wgt( ln_bt_av, ll_fw_start, icycle, wgtbtp1, wgtbtp2 )
[4292]	349	ENDIF
	350
[358]	351	! -----------------------------------------------------------------------------
	352	! Phase 1 : Coupling between general trend and barotropic estimates (1st step)
	353	! -----------------------------------------------------------------------------
[1502]	354	!
[4292]	355	!
[4354]	356	! !* e3*d/dt(Ua) (Vertically integrated)
[4292]	357	! ! --------------------------------------------------
[7753]	358	zu_frc(:,:) = 0._wp
	359	zv_frc(:,:) = 0._wp
[1502]	360	!
	361	DO jk = 1, jpkm1
[7753]	362	zu_frc(:,:) = zu_frc(:,:) + e3u_n(:,:,jk) * ua(:,:,jk) * umask(:,:,jk)
	363	zv_frc(:,:) = zv_frc(:,:) + e3v_n(:,:,jk) * va(:,:,jk) * vmask(:,:,jk)
[1502]	364	END DO
[4292]	365	!
[7753]	366	zu_frc(:,:) = zu_frc(:,:) * r1_hu_n(:,:)
	367	zv_frc(:,:) = zv_frc(:,:) * r1_hv_n(:,:)
[4292]	368	!
[7753]	369	!
[1502]	370	! !* baroclinic momentum trend (remove the vertical mean trend)
[4292]	371	DO jk = 1, jpkm1 ! -----------------------------------------------------------
[1502]	372	DO jj = 2, jpjm1
	373	DO ji = fs_2, fs_jpim1 ! vector opt.
[4292]	374	ua(ji,jj,jk) = ua(ji,jj,jk) - zu_frc(ji,jj) * umask(ji,jj,jk)
	375	va(ji,jj,jk) = va(ji,jj,jk) - zv_frc(ji,jj) * vmask(ji,jj,jk)
[1502]	376	END DO
[358]	377	END DO
[1502]	378	END DO
[7646]	379
	380	!!gm Question here when removing the Vertically integrated trends, we remove the vertically integrated NL trends on momentum....
	381	!!gm Is it correct to do so ? I think so...
	382
	383
[4292]	384	! !* barotropic Coriolis trends (vorticity scheme dependent)
	385	! ! --------------------------------------------------------
[9528]	386	!
[7753]	387	zwx(:,:) = un_b(:,:) * hu_n(:,:) * e2u(:,:) ! now fluxes
	388	zwy(:,:) = vn_b(:,:) * hv_n(:,:) * e1v(:,:)
[1502]	389	!
[9528]	390	SELECT CASE( nvor_scheme )
	391	CASE( np_ENT ) ! enstrophy conserving scheme (f-point)
[358]	392	DO jj = 2, jpjm1
[9528]	393	DO ji = 2, jpim1 ! vector opt.
	394	zu_trd(ji,jj) = + r1_4 * r1_e1e2u(ji,jj) * r1_hu_n(ji,jj) &
	395	& * ( e1e2t(ji+1,jj)ht_n(ji+1,jj)ff_t(ji+1,jj) * ( vn_b(ji+1,jj) + vn_b(ji+1,jj-1) ) &
	396	& + e1e2t(ji ,jj)ht_n(ji ,jj)ff_t(ji ,jj) * ( vn_b(ji ,jj) + vn_b(ji ,jj-1) ) )
	397	!
	398	zv_trd(ji,jj) = - r1_4 * r1_e1e2v(ji,jj) * r1_hv_n(ji,jj) &
	399	& * ( e1e2t(ji,jj+1)ht_n(ji,jj+1)ff_t(ji,jj+1) * ( un_b(ji,jj+1) + un_b(ji-1,jj+1) ) &
	400	& + e1e2t(ji,jj )ht_n(ji,jj )ff_t(ji,jj ) * ( un_b(ji,jj ) + un_b(ji-1,jj ) ) )
	401	END DO
	402	END DO
	403	!
	404	CASE( np_ENE , np_MIX ) ! energy conserving scheme (t-point) ENE or MIX
	405	DO jj = 2, jpjm1
[358]	406	DO ji = fs_2, fs_jpim1 ! vector opt.
[5836]	407	zy1 = ( zwy(ji,jj-1) + zwy(ji+1,jj-1) ) * r1_e1u(ji,jj)
	408	zy2 = ( zwy(ji,jj ) + zwy(ji+1,jj ) ) * r1_e1u(ji,jj)
	409	zx1 = ( zwx(ji-1,jj) + zwx(ji-1,jj+1) ) * r1_e2v(ji,jj)
	410	zx2 = ( zwx(ji ,jj) + zwx(ji ,jj+1) ) * r1_e2v(ji,jj)
[358]	411	! energy conserving formulation for planetary vorticity term
[9043]	412	zu_trd(ji,jj) = r1_4 * ( zwz(ji ,jj-1) * zy1 + zwz(ji,jj) * zy2 )
	413	zv_trd(ji,jj) = - r1_4 * ( zwz(ji-1,jj ) * zx1 + zwz(ji,jj) * zx2 )
[358]	414	END DO
	415	END DO
[508]	416	!
[9528]	417	CASE( np_ENS ) ! enstrophy conserving scheme (f-point)
[358]	418	DO jj = 2, jpjm1
	419	DO ji = fs_2, fs_jpim1 ! vector opt.
[9043]	420	zy1 = r1_8 * ( zwy(ji ,jj-1) + zwy(ji+1,jj-1) &
[5836]	421	& + zwy(ji ,jj ) + zwy(ji+1,jj ) ) * r1_e1u(ji,jj)
[9043]	422	zx1 = - r1_8 * ( zwx(ji-1,jj ) + zwx(ji-1,jj+1) &
[5836]	423	& + zwx(ji ,jj ) + zwx(ji ,jj+1) ) * r1_e2v(ji,jj)
[4292]	424	zu_trd(ji,jj) = zy1 * ( zwz(ji ,jj-1) + zwz(ji,jj) )
	425	zv_trd(ji,jj) = zx1 * ( zwz(ji-1,jj ) + zwz(ji,jj) )
[358]	426	END DO
	427	END DO
[508]	428	!
[9528]	429	CASE( np_EET , np_EEN ) ! energy & enstrophy scheme (using e3t or e3f)
[358]	430	DO jj = 2, jpjm1
	431	DO ji = fs_2, fs_jpim1 ! vector opt.
[9043]	432	zu_trd(ji,jj) = + r1_12 * r1_e1u(ji,jj) * ( ftne(ji,jj ) * zwy(ji ,jj ) &
[5836]	433	& + ftnw(ji+1,jj) * zwy(ji+1,jj ) &
	434	& + ftse(ji,jj ) * zwy(ji ,jj-1) &
	435	& + ftsw(ji+1,jj) * zwy(ji+1,jj-1) )
[9043]	436	zv_trd(ji,jj) = - r1_12 * r1_e2v(ji,jj) * ( ftsw(ji,jj+1) * zwx(ji-1,jj+1) &
[5836]	437	& + ftse(ji,jj+1) * zwx(ji ,jj+1) &
	438	& + ftnw(ji,jj ) * zwx(ji-1,jj ) &
	439	& + ftne(ji,jj ) * zwx(ji ,jj ) )
[358]	440	END DO
	441	END DO
[508]	442	!
[9528]	443	END SELECT
[4292]	444	!
[1502]	445	! !* Right-Hand-Side of the barotropic momentum equation
	446	! ! ----------------------------------------------------
[6140]	447	IF( .NOT.ln_linssh ) THEN ! Variable volume : remove surface pressure gradient
[9528]	448	IF( ln_wd_il ) THEN ! Calculating and applying W/D gravity filters
	449	DO jj = 2, jpjm1
	450	DO ji = 2, jpim1
	451	ll_tmp1 = MIN( sshn(ji,jj) , sshn(ji+1,jj) ) > &
	452	& MAX( -ht_0(ji,jj) , -ht_0(ji+1,jj) ) .AND. &
	453	& MAX( sshn(ji,jj) + ht_0(ji,jj) , sshn(ji+1,jj) + ht_0(ji+1,jj) ) &
	454	& > rn_wdmin1 + rn_wdmin2
	455	ll_tmp2 = ( ABS( sshn(ji+1,jj) - sshn(ji ,jj)) > 1.E-12 ).AND.( &
	456	& MAX( sshn(ji,jj) , sshn(ji+1,jj) ) > &
	457	& MAX( -ht_0(ji,jj) , -ht_0(ji+1,jj) ) + rn_wdmin1 + rn_wdmin2 )
	458	IF(ll_tmp1) THEN
	459	zcpx(ji,jj) = 1.0_wp
	460	ELSEIF(ll_tmp2) THEN
	461	! no worries about sshn(ji+1,jj) - sshn(ji ,jj) = 0, it won't happen ! here
	462	zcpx(ji,jj) = ABS( (sshn(ji+1,jj) + ht_0(ji+1,jj) - sshn(ji,jj) - ht_0(ji,jj)) &
	463	& / (sshn(ji+1,jj) - sshn(ji ,jj)) )
	464	zcpx(ji,jj) = max(min( zcpx(ji,jj) , 1.0_wp),0.0_wp)
	465	ELSE
	466	zcpx(ji,jj) = 0._wp
	467	ENDIF
	468	!
	469	ll_tmp1 = MIN( sshn(ji,jj) , sshn(ji,jj+1) ) > &
	470	& MAX( -ht_0(ji,jj) , -ht_0(ji,jj+1) ) .AND. &
	471	& MAX( sshn(ji,jj) + ht_0(ji,jj) , sshn(ji,jj+1) + ht_0(ji,jj+1) ) &
[9023]	472	& > rn_wdmin1 + rn_wdmin2
[9528]	473	ll_tmp2 = ( ABS( sshn(ji,jj) - sshn(ji,jj+1)) > 1.E-12 ).AND.( &
	474	& MAX( sshn(ji,jj) , sshn(ji,jj+1) ) > &
	475	& MAX( -ht_0(ji,jj) , -ht_0(ji,jj+1) ) + rn_wdmin1 + rn_wdmin2 )
[9023]	476
[9528]	477	IF(ll_tmp1) THEN
	478	zcpy(ji,jj) = 1.0_wp
	479	ELSE IF(ll_tmp2) THEN
	480	! no worries about sshn(ji,jj+1) - sshn(ji,jj ) = 0, it won't happen ! here
	481	zcpy(ji,jj) = ABS( (sshn(ji,jj+1) + ht_0(ji,jj+1) - sshn(ji,jj) - ht_0(ji,jj)) &
	482	& / (sshn(ji,jj+1) - sshn(ji,jj )) )
	483	zcpy(ji,jj) = MAX( 0._wp , MIN( zcpy(ji,jj) , 1.0_wp ) )
	484	ELSE
	485	zcpy(ji,jj) = 0._wp
	486	ENDIF
	487	END DO
	488	END DO
	489	!
	490	DO jj = 2, jpjm1
	491	DO ji = 2, jpim1
	492	zu_trd(ji,jj) = zu_trd(ji,jj) - grav * ( sshn(ji+1,jj ) - sshn(ji ,jj ) ) &
	493	& * r1_e1u(ji,jj) * zcpx(ji,jj) * wdrampu(ji,jj) !jth
	494	zv_trd(ji,jj) = zv_trd(ji,jj) - grav * ( sshn(ji ,jj+1) - sshn(ji ,jj ) ) &
	495	& * r1_e2v(ji,jj) * zcpy(ji,jj) * wdrampv(ji,jj) !jth
	496	END DO
	497	END DO
	498	!
[6152]	499	ELSE
[9019]	500	!
	501	DO jj = 2, jpjm1
	502	DO ji = fs_2, fs_jpim1 ! vector opt.
	503	zu_trd(ji,jj) = zu_trd(ji,jj) - grav * ( sshn(ji+1,jj ) - sshn(ji ,jj ) ) * r1_e1u(ji,jj)
	504	zv_trd(ji,jj) = zv_trd(ji,jj) - grav * ( sshn(ji ,jj+1) - sshn(ji ,jj ) ) * r1_e2v(ji,jj)
	505	END DO
	506	END DO
	507	ENDIF
	508	!
[1502]	509	ENDIF
[9019]	510	!
[4292]	511	DO jj = 2, jpjm1 ! Remove coriolis term (and possibly spg) from barotropic trend
[358]	512	DO ji = fs_2, fs_jpim1
[6140]	513	zu_frc(ji,jj) = zu_frc(ji,jj) - zu_trd(ji,jj) * ssumask(ji,jj)
	514	zv_frc(ji,jj) = zv_frc(ji,jj) - zv_trd(ji,jj) * ssvmask(ji,jj)
[3294]	515	END DO
[4292]	516	END DO
	517	!
[9023]	518	! ! Add bottom stress contribution from baroclinic velocities:
	519	IF (ln_bt_fw) THEN
[4292]	520	DO jj = 2, jpjm1
	521	DO ji = fs_2, fs_jpim1 ! vector opt.
	522	ikbu = mbku(ji,jj)
	523	ikbv = mbkv(ji,jj)
	524	zwx(ji,jj) = un(ji,jj,ikbu) - un_b(ji,jj) ! NOW bottom baroclinic velocities
	525	zwy(ji,jj) = vn(ji,jj,ikbv) - vn_b(ji,jj)
	526	END DO
	527	END DO
[3294]	528	ELSE
[4292]	529	DO jj = 2, jpjm1
	530	DO ji = fs_2, fs_jpim1 ! vector opt.
	531	ikbu = mbku(ji,jj)
	532	ikbv = mbkv(ji,jj)
	533	zwx(ji,jj) = ub(ji,jj,ikbu) - ub_b(ji,jj) ! BEFORE bottom baroclinic velocities
	534	zwy(ji,jj) = vb(ji,jj,ikbv) - vb_b(ji,jj)
	535	END DO
	536	END DO
	537	ENDIF
[1502]	538	!
[4292]	539	! Note that the "unclipped" bottom friction parameter is used even with explicit drag
[9023]	540	IF( ln_wd_il ) THEN
[9075]	541	zztmp = -1._wp / rdtbt
[9045]	542	DO jj = 2, jpjm1
	543	DO ji = fs_2, fs_jpim1 ! vector opt.
[9112]	544	zu_frc(ji,jj) = zu_frc(ji,jj) + &
	545	& MAX(r1_hu_n(ji,jj) * r1_2 * ( rCdU_bot(ji+1,jj)+rCdU_bot(ji,jj) ), zztmp ) * zwx(ji,jj) * wdrampu(ji,jj)
	546	zv_frc(ji,jj) = zv_frc(ji,jj) + &
	547	& MAX(r1_hv_n(ji,jj) * r1_2 * ( rCdU_bot(ji,jj+1)+rCdU_bot(ji,jj) ), zztmp ) * zwy(ji,jj) * wdrampv(ji,jj)
[9045]	548	END DO
	549	END DO
[9023]	550	ELSE
[9045]	551	DO jj = 2, jpjm1
	552	DO ji = fs_2, fs_jpim1 ! vector opt.
[9112]	553	zu_frc(ji,jj) = zu_frc(ji,jj) + r1_hu_n(ji,jj) * r1_2 * ( rCdU_bot(ji+1,jj)+rCdU_bot(ji,jj) ) * zwx(ji,jj)
	554	zv_frc(ji,jj) = zv_frc(ji,jj) + r1_hv_n(ji,jj) * r1_2 * ( rCdU_bot(ji,jj+1)+rCdU_bot(ji,jj) ) * zwy(ji,jj)
[9045]	555	END DO
	556	END DO
[9023]	557	END IF
	558	!
[9019]	559	IF( ln_isfcav ) THEN ! Add TOP stress contribution from baroclinic velocities:
	560	IF( ln_bt_fw ) THEN
	561	DO jj = 2, jpjm1
	562	DO ji = fs_2, fs_jpim1 ! vector opt.
	563	iktu = miku(ji,jj)
	564	iktv = mikv(ji,jj)
	565	zwx(ji,jj) = un(ji,jj,iktu) - un_b(ji,jj) ! NOW top baroclinic velocities
	566	zwy(ji,jj) = vn(ji,jj,iktv) - vn_b(ji,jj)
	567	END DO
	568	END DO
	569	ELSE
	570	DO jj = 2, jpjm1
	571	DO ji = fs_2, fs_jpim1 ! vector opt.
	572	iktu = miku(ji,jj)
	573	iktv = mikv(ji,jj)
	574	zwx(ji,jj) = ub(ji,jj,iktu) - ub_b(ji,jj) ! BEFORE top baroclinic velocities
	575	zwy(ji,jj) = vb(ji,jj,iktv) - vb_b(ji,jj)
	576	END DO
	577	END DO
	578	ENDIF
	579	!
	580	! Note that the "unclipped" top friction parameter is used even with explicit drag
	581	DO jj = 2, jpjm1
	582	DO ji = fs_2, fs_jpim1 ! vector opt.
[9112]	583	zu_frc(ji,jj) = zu_frc(ji,jj) + r1_hu_n(ji,jj) * r1_2 * ( rCdU_top(ji+1,jj)+rCdU_top(ji,jj) ) * zwx(ji,jj)
	584	zv_frc(ji,jj) = zv_frc(ji,jj) + r1_hv_n(ji,jj) * r1_2 * ( rCdU_top(ji,jj+1)+rCdU_top(ji,jj) ) * zwy(ji,jj)
[9019]	585	END DO
	586	END DO
	587	ENDIF
[6140]	588	!
[9019]	589	IF( ln_bt_fw ) THEN ! Add wind forcing
	590	DO jj = 2, jpjm1
	591	DO ji = fs_2, fs_jpim1 ! vector opt.
	592	zu_frc(ji,jj) = zu_frc(ji,jj) + r1_rau0 * utau(ji,jj) * r1_hu_n(ji,jj)
	593	zv_frc(ji,jj) = zv_frc(ji,jj) + r1_rau0 * vtau(ji,jj) * r1_hv_n(ji,jj)
	594	END DO
	595	END DO
[2724]	596	ELSE
[9043]	597	zztmp = r1_rau0 * r1_2
[9019]	598	DO jj = 2, jpjm1
	599	DO ji = fs_2, fs_jpim1 ! vector opt.
	600	zu_frc(ji,jj) = zu_frc(ji,jj) + zztmp * ( utau_b(ji,jj) + utau(ji,jj) ) * r1_hu_n(ji,jj)
	601	zv_frc(ji,jj) = zv_frc(ji,jj) + zztmp * ( vtau_b(ji,jj) + vtau(ji,jj) ) * r1_hv_n(ji,jj)
	602	END DO
	603	END DO
[4292]	604	ENDIF
	605	!
[9019]	606	IF( ln_apr_dyn ) THEN ! Add atm pressure forcing
	607	IF( ln_bt_fw ) THEN
[4292]	608	DO jj = 2, jpjm1
	609	DO ji = fs_2, fs_jpim1 ! vector opt.
[5836]	610	zu_spg = grav * ( ssh_ib (ji+1,jj ) - ssh_ib (ji,jj) ) * r1_e1u(ji,jj)
	611	zv_spg = grav * ( ssh_ib (ji ,jj+1) - ssh_ib (ji,jj) ) * r1_e2v(ji,jj)
[4292]	612	zu_frc(ji,jj) = zu_frc(ji,jj) + zu_spg
	613	zv_frc(ji,jj) = zv_frc(ji,jj) + zv_spg
	614	END DO
	615	END DO
	616	ELSE
[9043]	617	zztmp = grav * r1_2
[4292]	618	DO jj = 2, jpjm1
	619	DO ji = fs_2, fs_jpim1 ! vector opt.
[9019]	620	zu_spg = zztmp * ( ssh_ib (ji+1,jj ) - ssh_ib (ji,jj) &
	621	& + ssh_ibb(ji+1,jj ) - ssh_ibb(ji,jj) ) * r1_e1u(ji,jj)
	622	zv_spg = zztmp * ( ssh_ib (ji ,jj+1) - ssh_ib (ji,jj) &
	623	& + ssh_ibb(ji ,jj+1) - ssh_ibb(ji,jj) ) * r1_e2v(ji,jj)
[4292]	624	zu_frc(ji,jj) = zu_frc(ji,jj) + zu_spg
	625	zv_frc(ji,jj) = zv_frc(ji,jj) + zv_spg
	626	END DO
	627	END DO
	628	ENDIF
[2724]	629	ENDIF
[4292]	630	! !* Right-Hand-Side of the barotropic ssh equation
	631	! ! -----------------------------------------------
	632	! ! Surface net water flux and rivers
	633	IF (ln_bt_fw) THEN
[9019]	634	zssh_frc(:,:) = r1_rau0 * ( emp(:,:) - rnf(:,:) + fwfisf(:,:) )
[4292]	635	ELSE
[9043]	636	zztmp = r1_rau0 * r1_2
[9019]	637	zssh_frc(:,:) = zztmp * ( emp(:,:) + emp_b(:,:) - rnf(:,:) - rnf_b(:,:) &
	638	& + fwfisf(:,:) + fwfisf_b(:,:) )
[4292]	639	ENDIF
[7646]	640	!
	641	IF( ln_sdw ) THEN ! Stokes drift divergence added if necessary
[7753]	642	zssh_frc(:,:) = zssh_frc(:,:) + div_sd(:,:)
[7646]	643	ENDIF
	644	!
[4292]	645	#if defined key_asminc
	646	! ! Include the IAU weighted SSH increment
	647	IF( lk_asminc .AND. ln_sshinc .AND. ln_asmiau ) THEN
[7753]	648	zssh_frc(:,:) = zssh_frc(:,:) - ssh_iau(:,:)
[4292]	649	ENDIF
	650	#endif
[5656]	651	! !* Fill boundary data arrays for AGRIF
	652	! ! ------------------------------------
[4486]	653	#if defined key_agrif
	654	IF( .NOT.Agrif_Root() ) CALL agrif_dta_ts( kt )
	655	#endif
[4292]	656	!
[358]	657	! -----------------------------------------------------------------------
[4292]	658	! Phase 2 : Integration of the barotropic equations
[358]	659	! -----------------------------------------------------------------------
[1502]	660	!
	661	! ! ==================== !
	662	! ! Initialisations !
[4292]	663	! ! ==================== !
[4370]	664	! Initialize barotropic variables:
[4770]	665	IF( ll_init )THEN
[7753]	666	sshbb_e(:,:) = 0._wp
	667	ubb_e (:,:) = 0._wp
	668	vbb_e (:,:) = 0._wp
	669	sshb_e (:,:) = 0._wp
	670	ub_e (:,:) = 0._wp
	671	vb_e (:,:) = 0._wp
[4700]	672	ENDIF
[6152]	673
[4700]	674	!
[4370]	675	IF (ln_bt_fw) THEN ! FORWARD integration: start from NOW fields
[7753]	676	sshn_e(:,:) = sshn(:,:)
	677	un_e (:,:) = un_b(:,:)
	678	vn_e (:,:) = vn_b(:,:)
	679	!
	680	hu_e (:,:) = hu_n(:,:)
	681	hv_e (:,:) = hv_n(:,:)
	682	hur_e (:,:) = r1_hu_n(:,:)
	683	hvr_e (:,:) = r1_hv_n(:,:)
[4370]	684	ELSE ! CENTRED integration: start from BEFORE fields
[7753]	685	sshn_e(:,:) = sshb(:,:)
	686	un_e (:,:) = ub_b(:,:)
	687	vn_e (:,:) = vb_b(:,:)
	688	!
	689	hu_e (:,:) = hu_b(:,:)
	690	hv_e (:,:) = hv_b(:,:)
	691	hur_e (:,:) = r1_hu_b(:,:)
	692	hvr_e (:,:) = r1_hv_b(:,:)
[4292]	693	ENDIF
	694	!
	695	!
[4370]	696	!
[4292]	697	! Initialize sums:
[7753]	698	ua_b (:,:) = 0._wp ! After barotropic velocities (or transport if flux form)
	699	va_b (:,:) = 0._wp
	700	ssha (:,:) = 0._wp ! Sum for after averaged sea level
	701	un_adv(:,:) = 0._wp ! Sum for now transport issued from ts loop
	702	vn_adv(:,:) = 0._wp
[9528]	703	!
	704	IF( ln_wd_dl ) THEN
[9023]	705	zuwdmask(:,:) = 0._wp ! set to zero for definiteness (not sure this is necessary)
	706	zvwdmask(:,:) = 0._wp !
[9528]	707	zuwdav2 (:,:) = 0._wp
	708	zvwdav2 (:,:) = 0._wp
[9023]	709	END IF
	710
[9528]	711	! ! ==================== !
[4292]	712	DO jn = 1, icycle ! sub-time-step loop !
[1502]	713	! ! ==================== !
[10425]	714	!
	715	l_full_nf_update = jn == icycle ! false: disable full North fold update (performances) for jn = 1 to icycle-1
	716	! ! ------------------
[3294]	717	! !* Update the forcing (BDY and tides)
[1502]	718	! ! ------------------
[4292]	719	! Update only tidal forcing at open boundaries
[7646]	720	IF( ln_bdy .AND. ln_tide ) CALL bdy_dta_tides( kt, kit=jn, time_offset= noffset+1 )
	721	IF( ln_tide_pot .AND. ln_tide ) CALL upd_tide ( kt, kit=jn, time_offset= noffset )
[4292]	722	!
	723	! Set extrapolation coefficients for predictor step:
	724	IF ((jn<3).AND.ll_init) THEN ! Forward
	725	za1 = 1._wp
	726	za2 = 0._wp
	727	za3 = 0._wp
	728	ELSE ! AB3-AM4 Coefficients: bet=0.281105
	729	za1 = 1.781105_wp ! za1 = 3/2 + bet
	730	za2 = -1.06221_wp ! za2 = -(1/2 + 2*bet)
	731	za3 = 0.281105_wp ! za3 = bet
	732	ENDIF
[367]	733
[4292]	734	! Extrapolate barotropic velocities at step jit+0.5:
[7753]	735	ua_e(:,:) = za1 * un_e(:,:) + za2 * ub_e(:,:) + za3 * ubb_e(:,:)
	736	va_e(:,:) = za1 * vn_e(:,:) + za2 * vb_e(:,:) + za3 * vbb_e(:,:)
[4292]	737
[6140]	738	IF( .NOT.ln_linssh ) THEN !* Update ocean depth (variable volume case only)
[4292]	739	! ! ------------------
	740	! Extrapolate Sea Level at step jit+0.5:
[7753]	741	zsshp2_e(:,:) = za1 * sshn_e(:,:) + za2 * sshb_e(:,:) + za3 * sshbb_e(:,:)
[9023]	742
	743	! set wetting & drying mask at tracer points for this barotropic sub-step
	744	IF ( ln_wd_dl ) THEN
[9528]	745	!
[9023]	746	IF ( ln_wd_dl_rmp ) THEN
	747	DO jj = 1, jpj
	748	DO ji = 1, jpi ! vector opt.
	749	IF ( zsshp2_e(ji,jj) + ht_0(ji,jj) > 2._wp * rn_wdmin1 ) THEN
	750	! IF ( zsshp2_e(ji,jj) + ht_0(ji,jj) > rn_wdmin2 ) THEN
	751	ztwdmask(ji,jj) = 1._wp
	752	ELSE IF ( zsshp2_e(ji,jj) + ht_0(ji,jj) > rn_wdmin1 ) THEN
	753	ztwdmask(ji,jj) = (tanh(50._wp( ( zsshp2_e(ji,jj) + ht_0(ji,jj) - rn_wdmin1 )r_rn_wdmin1)) )
	754	ELSE
	755	ztwdmask(ji,jj) = 0._wp
	756	END IF
	757	END DO
	758	END DO
	759	ELSE
	760	DO jj = 1, jpj
	761	DO ji = 1, jpi ! vector opt.
	762	IF ( zsshp2_e(ji,jj) + ht_0(ji,jj) > rn_wdmin1 ) THEN
	763	ztwdmask(ji,jj) = 1._wp
	764	ELSE
	765	ztwdmask(ji,jj) = 0._wp
[9528]	766	ENDIF
[9023]	767	END DO
	768	END DO
[9528]	769	ENDIF
	770	!
	771	ENDIF
	772	!
[4292]	773	DO jj = 2, jpjm1 ! Sea Surface Height at u- & v-points
	774	DO ji = 2, fs_jpim1 ! Vector opt.
[9043]	775	zwx(ji,jj) = r1_2 * ssumask(ji,jj) * r1_e1e2u(ji,jj) &
[5836]	776	& * ( e1e2t(ji ,jj) * zsshp2_e(ji ,jj) &
	777	& + e1e2t(ji+1,jj) * zsshp2_e(ji+1,jj) )
[9043]	778	zwy(ji,jj) = r1_2 * ssvmask(ji,jj) * r1_e1e2v(ji,jj) &
[5836]	779	& * ( e1e2t(ji,jj ) * zsshp2_e(ji,jj ) &
	780	& + e1e2t(ji,jj+1) * zsshp2_e(ji,jj+1) )
[4292]	781	END DO
	782	END DO
[10425]	783	CALL lbc_lnk_multi( 'dynspg_ts', zwx, 'U', 1._wp, zwy, 'V', 1._wp )
[4292]	784	!
[9528]	785	zhup2_e(:,:) = hu_0(:,:) + zwx(:,:) ! Ocean depth at U- and V-points
	786	zhvp2_e(:,:) = hv_0(:,:) + zwy(:,:)
	787	zhtp2_e(:,:) = ht_0(:,:) + zsshp2_e(:,:)
[4370]	788	ELSE
[9528]	789	zhup2_e(:,:) = hu_n(:,:)
	790	zhvp2_e(:,:) = hv_n(:,:)
	791	zhtp2_e(:,:) = ht_n(:,:)
[4292]	792	ENDIF
	793	! !* after ssh
[1502]	794	! ! -----------
[4292]	795	!
[10481]	796	! Enforce volume conservation at open boundaries:
	797	IF( ln_bdy .AND. ln_vol ) CALL bdy_vol2d( kt, jn, ua_e, va_e, zhup2_e, zhvp2_e )
	798	!
[11205]	799	#if defined key_agrif
	800	! Set fluxes during predictor step to ensure volume conservation
	801	IF( .NOT.Agrif_Root() .AND. ln_bt_fw ) CALL agrif_dyn_ts( jn )
	802	#endif
[7753]	803	zwx(:,:) = e2u(:,:) * ua_e(:,:) * zhup2_e(:,:) ! fluxes at jn+0.5
	804	zwy(:,:) = e1v(:,:) * va_e(:,:) * zhvp2_e(:,:)
[4486]	805	!
[9528]	806	IF( ln_wd_il ) CALL wad_lmt_bt(zwx, zwy, sshn_e, zssh_frc, rdtbt)
[9023]	807
	808	IF ( ln_wd_dl ) THEN
[9528]	809	!
	810	! un_e and vn_e are set to zero at faces where the direction of the flow is from dry cells
	811	!
[9023]	812	DO jj = 1, jpjm1
	813	DO ji = 1, jpim1
	814	IF ( zwx(ji,jj) > 0.0 ) THEN
	815	zuwdmask(ji, jj) = ztwdmask(ji ,jj)
	816	ELSE
	817	zuwdmask(ji, jj) = ztwdmask(ji+1,jj)
	818	END IF
	819	zwx(ji, jj) = zuwdmask(ji,jj)*zwx(ji, jj)
	820	un_e(ji,jj) = zuwdmask(ji,jj)*un_e(ji,jj)
	821
	822	IF ( zwy(ji,jj) > 0.0 ) THEN
	823	zvwdmask(ji, jj) = ztwdmask(ji, jj )
	824	ELSE
	825	zvwdmask(ji, jj) = ztwdmask(ji, jj+1)
	826	END IF
	827	zwy(ji, jj) = zvwdmask(ji,jj)*zwy(ji,jj)
	828	vn_e(ji,jj) = zvwdmask(ji,jj)*vn_e(ji,jj)
	829	END DO
	830	END DO
[9528]	831	!
	832	ENDIF
[9023]	833
[4486]	834	! Sum over sub-time-steps to compute advective velocities
	835	za2 = wgtbtp2(jn)
[7753]	836	un_adv(:,:) = un_adv(:,:) + za2 * zwx(:,:) * r1_e2u(:,:)
	837	vn_adv(:,:) = vn_adv(:,:) + za2 * zwy(:,:) * r1_e1v(:,:)
[9023]	838
	839	! sum over sub-time-steps to decide which baroclinic velocities to set to zero (zuwdav2 is only used when ln_wd_dl_bc = True)
	840	IF ( ln_wd_dl_bc ) THEN
	841	zuwdav2(:,:) = zuwdav2(:,:) + za2 * zuwdmask(:,:)
	842	zvwdav2(:,:) = zvwdav2(:,:) + za2 * zvwdmask(:,:)
	843	END IF
	844
[4486]	845	! Set next sea level:
[4292]	846	DO jj = 2, jpjm1
[358]	847	DO ji = fs_2, fs_jpim1 ! vector opt.
[4292]	848	zhdiv(ji,jj) = ( zwx(ji,jj) - zwx(ji-1,jj) &
[5836]	849	& + zwy(ji,jj) - zwy(ji,jj-1) ) * r1_e1e2t(ji,jj)
[358]	850	END DO
	851	END DO
[7753]	852	ssha_e(:,:) = ( sshn_e(:,:) - rdtbt * ( zssh_frc(:,:) + zhdiv(:,:) ) ) * ssmask(:,:)
	853
[10425]	854	CALL lbc_lnk( 'dynspg_ts', ssha_e, 'T', 1._wp )
[4292]	855
[6140]	856	! Duplicate sea level across open boundaries (this is only cosmetic if linssh=T)
[7646]	857	IF( ln_bdy ) CALL bdy_ssh( ssha_e )
[4292]	858	#if defined key_agrif
[6140]	859	IF( .NOT.Agrif_Root() ) CALL agrif_ssh_ts( jn )
[4292]	860	#endif
	861	!
	862	! Sea Surface Height at u-,v-points (vvl case only)
[6140]	863	IF( .NOT.ln_linssh ) THEN
[4292]	864	DO jj = 2, jpjm1
	865	DO ji = 2, jpim1 ! NO Vector Opt.
[9043]	866	zsshu_a(ji,jj) = r1_2 * ssumask(ji,jj) * r1_e1e2u(ji,jj) &
[6140]	867	& * ( e1e2t(ji ,jj ) * ssha_e(ji ,jj ) &
	868	& + e1e2t(ji+1,jj ) * ssha_e(ji+1,jj ) )
[9043]	869	zsshv_a(ji,jj) = r1_2 * ssvmask(ji,jj) * r1_e1e2v(ji,jj) &
[6140]	870	& * ( e1e2t(ji ,jj ) * ssha_e(ji ,jj ) &
	871	& + e1e2t(ji ,jj+1) * ssha_e(ji ,jj+1) )
[4292]	872	END DO
[358]	873	END DO
[10425]	874	CALL lbc_lnk_multi( 'dynspg_ts', zsshu_a, 'U', 1._wp, zsshv_a, 'V', 1._wp )
[4292]	875	ENDIF
	876	!
	877	! Half-step back interpolation of SSH for surface pressure computation:
	878	!----------------------------------------------------------------------
	879	IF ((jn==1).AND.ll_init) THEN
	880	za0=1._wp ! Forward-backward
	881	za1=0._wp
	882	za2=0._wp
	883	za3=0._wp
	884	ELSEIF ((jn==2).AND.ll_init) THEN ! AB2-AM3 Coefficients; bet=0 ; gam=-1/6 ; eps=1/12
	885	za0= 1.0833333333333_wp ! za0 = 1-gam-eps
	886	za1=-0.1666666666666_wp ! za1 = gam
	887	za2= 0.0833333333333_wp ! za2 = eps
	888	za3= 0._wp
	889	ELSE ! AB3-AM4 Coefficients; bet=0.281105 ; eps=0.013 ; gam=0.0880
[9023]	890	IF (rn_bt_alpha==0._wp) THEN
	891	za0=0.614_wp ! za0 = 1/2 + gam + 2*eps
	892	za1=0.285_wp ! za1 = 1/2 - 2gam - 3eps
	893	za2=0.088_wp ! za2 = gam
	894	za3=0.013_wp ! za3 = eps
	895	ELSE
	896	zepsilon = 0.00976186_wp - 0.13451357_wp * rn_bt_alpha
	897	zgamma = 0.08344500_wp - 0.51358400_wp * rn_bt_alpha
	898	za0 = 0.5_wp + zgamma + 2._wp * rn_bt_alpha + 2._wp * zepsilon
	899	za1 = 1._wp - za0 - zgamma - zepsilon
	900	za2 = zgamma
	901	za3 = zepsilon
	902	ENDIF
[4292]	903	ENDIF
[6140]	904	!
[9528]	905	zsshp2_e(:,:) = za0 * ssha_e(:,:) + za1 * sshn_e (:,:) &
	906	& + za2 * sshb_e(:,:) + za3 * sshbb_e(:,:)
	907
[9023]	908	IF( ln_wd_il ) THEN ! Calculating and applying W/D gravity filters
[6152]	909	DO jj = 2, jpjm1
[7646]	910	DO ji = 2, jpim1
	911	ll_tmp1 = MIN( zsshp2_e(ji,jj) , zsshp2_e(ji+1,jj) ) > &
[9023]	912	& MAX( -ht_0(ji,jj) , -ht_0(ji+1,jj) ) .AND. &
	913	& MAX( zsshp2_e(ji,jj) + ht_0(ji,jj) , zsshp2_e(ji+1,jj) + ht_0(ji+1,jj) ) &
[7646]	914	& > rn_wdmin1 + rn_wdmin2
	915	ll_tmp2 = (ABS(zsshp2_e(ji,jj) - zsshp2_e(ji+1,jj)) > 1.E-12 ).AND.( &
	916	& MAX( zsshp2_e(ji,jj) , zsshp2_e(ji+1,jj) ) > &
[9023]	917	& MAX( -ht_0(ji,jj) , -ht_0(ji+1,jj) ) + rn_wdmin1 + rn_wdmin2 )
[7646]	918
	919	IF(ll_tmp1) THEN
	920	zcpx(ji,jj) = 1.0_wp
	921	ELSE IF(ll_tmp2) THEN
	922	! no worries about zsshp2_e(ji+1,jj) - zsshp2_e(ji ,jj) = 0, it won't happen ! here
[9023]	923	zcpx(ji,jj) = ABS( (zsshp2_e(ji+1,jj) + ht_0(ji+1,jj) - zsshp2_e(ji,jj) - ht_0(ji,jj)) &
[7646]	924	& / (zsshp2_e(ji+1,jj) - zsshp2_e(ji ,jj)) )
	925	ELSE
	926	zcpx(ji,jj) = 0._wp
[9528]	927	ENDIF
	928	!
[7646]	929	ll_tmp1 = MIN( zsshp2_e(ji,jj) , zsshp2_e(ji,jj+1) ) > &
[9023]	930	& MAX( -ht_0(ji,jj) , -ht_0(ji,jj+1) ) .AND. &
	931	& MAX( zsshp2_e(ji,jj) + ht_0(ji,jj) , zsshp2_e(ji,jj+1) + ht_0(ji,jj+1) ) &
[7646]	932	& > rn_wdmin1 + rn_wdmin2
	933	ll_tmp2 = (ABS(zsshp2_e(ji,jj) - zsshp2_e(ji,jj+1)) > 1.E-12 ).AND.( &
	934	& MAX( zsshp2_e(ji,jj) , zsshp2_e(ji,jj+1) ) > &
[9023]	935	& MAX( -ht_0(ji,jj) , -ht_0(ji,jj+1) ) + rn_wdmin1 + rn_wdmin2 )
[7646]	936
	937	IF(ll_tmp1) THEN
	938	zcpy(ji,jj) = 1.0_wp
[9528]	939	ELSEIF(ll_tmp2) THEN
[7646]	940	! no worries about zsshp2_e(ji,jj+1) - zsshp2_e(ji,jj ) = 0, it won't happen ! here
[9023]	941	zcpy(ji,jj) = ABS( (zsshp2_e(ji,jj+1) + ht_0(ji,jj+1) - zsshp2_e(ji,jj) - ht_0(ji,jj)) &
[7646]	942	& / (zsshp2_e(ji,jj+1) - zsshp2_e(ji,jj )) )
	943	ELSE
	944	zcpy(ji,jj) = 0._wp
[9528]	945	ENDIF
[6152]	946	END DO
[7646]	947	END DO
[9528]	948	ENDIF
[1502]	949	!
[4292]	950	! Compute associated depths at U and V points:
[9023]	951	IF( .NOT.ln_linssh .AND. .NOT.ln_dynadv_vec ) THEN !* Vector form
[4292]	952	!
	953	DO jj = 2, jpjm1
	954	DO ji = 2, jpim1
[9043]	955	zx1 = r1_2 * ssumask(ji ,jj) * r1_e1e2u(ji ,jj) &
[5836]	956	& * ( e1e2t(ji ,jj ) * zsshp2_e(ji ,jj) &
	957	& + e1e2t(ji+1,jj ) * zsshp2_e(ji+1,jj ) )
[9043]	958	zy1 = r1_2 * ssvmask(ji ,jj) * r1_e1e2v(ji ,jj ) &
[5836]	959	& * ( e1e2t(ji ,jj ) * zsshp2_e(ji ,jj ) &
	960	& + e1e2t(ji ,jj+1) * zsshp2_e(ji ,jj+1) )
[4292]	961	zhust_e(ji,jj) = hu_0(ji,jj) + zx1
	962	zhvst_e(ji,jj) = hv_0(ji,jj) + zy1
	963	END DO
	964	END DO
[9528]	965	!
[4292]	966	ENDIF
	967	!
	968	! Add Coriolis trend:
[6140]	969	! zwz array below or triads normally depend on sea level with ln_linssh=F and should be updated
[4292]	970	! at each time step. We however keep them constant here for optimization.
	971	! Recall that zwx and zwy arrays hold fluxes at this stage:
	972	! zwx(:,:) = e2u(:,:) * ua_e(:,:) * zhup2_e(:,:) ! fluxes at jn+0.5
	973	! zwy(:,:) = e1v(:,:) * va_e(:,:) * zhvp2_e(:,:)
	974	!
[9528]	975	SELECT CASE( nvor_scheme )
	976	CASE( np_ENT ) ! energy conserving scheme (t-point)
	977	DO jj = 2, jpjm1
	978	DO ji = 2, jpim1 ! vector opt.
	979
[10742]	980	z1_hu = ssumask(ji,jj) / ( zhup2_e(ji,jj) + 1._wp - ssumask(ji,jj) )
	981	z1_hv = ssvmask(ji,jj) / ( zhvp2_e(ji,jj) + 1._wp - ssvmask(ji,jj) )
[9528]	982
	983	zu_trd(ji,jj) = + r1_4 * r1_e1e2u(ji,jj) * z1_hu &
	984	& * ( e1e2t(ji+1,jj)zhtp2_e(ji+1,jj)ff_t(ji+1,jj) * ( va_e(ji+1,jj) + va_e(ji+1,jj-1) ) &
	985	& + e1e2t(ji ,jj)zhtp2_e(ji ,jj)ff_t(ji ,jj) * ( va_e(ji ,jj) + va_e(ji ,jj-1) ) )
	986	!
	987	zv_trd(ji,jj) = - r1_4 * r1_e1e2v(ji,jj) * z1_hv &
	988	& * ( e1e2t(ji,jj+1)zhtp2_e(ji,jj+1)ff_t(ji,jj+1) * ( ua_e(ji,jj+1) + ua_e(ji-1,jj+1) ) &
	989	& + e1e2t(ji,jj )zhtp2_e(ji,jj )ff_t(ji,jj ) * ( ua_e(ji,jj ) + ua_e(ji-1,jj ) ) )
	990	END DO
	991	END DO
	992	!
	993	CASE( np_ENE, np_MIX ) ! energy conserving scheme (f-point)
[358]	994	DO jj = 2, jpjm1
	995	DO ji = fs_2, fs_jpim1 ! vector opt.
[5836]	996	zy1 = ( zwy(ji ,jj-1) + zwy(ji+1,jj-1) ) * r1_e1u(ji,jj)
	997	zy2 = ( zwy(ji ,jj ) + zwy(ji+1,jj ) ) * r1_e1u(ji,jj)
	998	zx1 = ( zwx(ji-1,jj ) + zwx(ji-1,jj+1) ) * r1_e2v(ji,jj)
	999	zx2 = ( zwx(ji ,jj ) + zwx(ji ,jj+1) ) * r1_e2v(ji,jj)
[9043]	1000	zu_trd(ji,jj) = r1_4 * ( zwz(ji ,jj-1) * zy1 + zwz(ji,jj) * zy2 )
	1001	zv_trd(ji,jj) =-r1_4 * ( zwz(ji-1,jj ) * zx1 + zwz(ji,jj) * zx2 )
[358]	1002	END DO
	1003	END DO
[508]	1004	!
[9528]	1005	CASE( np_ENS ) ! enstrophy conserving scheme (f-point)
[358]	1006	DO jj = 2, jpjm1
	1007	DO ji = fs_2, fs_jpim1 ! vector opt.
[9043]	1008	zy1 = r1_8 * ( zwy(ji ,jj-1) + zwy(ji+1,jj-1) &
[5836]	1009	& + zwy(ji ,jj ) + zwy(ji+1,jj ) ) * r1_e1u(ji,jj)
[9043]	1010	zx1 = - r1_8 * ( zwx(ji-1,jj ) + zwx(ji-1,jj+1) &
[5836]	1011	& + zwx(ji ,jj ) + zwx(ji ,jj+1) ) * r1_e2v(ji,jj)
[4292]	1012	zu_trd(ji,jj) = zy1 * ( zwz(ji ,jj-1) + zwz(ji,jj) )
	1013	zv_trd(ji,jj) = zx1 * ( zwz(ji-1,jj ) + zwz(ji,jj) )
[358]	1014	END DO
	1015	END DO
[508]	1016	!
[9528]	1017	CASE( np_EET , np_EEN ) ! energy & enstrophy scheme (using e3t or e3f)
[358]	1018	DO jj = 2, jpjm1
	1019	DO ji = fs_2, fs_jpim1 ! vector opt.
[9528]	1020	zu_trd(ji,jj) = + r1_12 * r1_e1u(ji,jj) * ( ftne(ji,jj ) * zwy(ji ,jj ) &
	1021	& + ftnw(ji+1,jj) * zwy(ji+1,jj ) &
	1022	& + ftse(ji,jj ) * zwy(ji ,jj-1) &
	1023	& + ftsw(ji+1,jj) * zwy(ji+1,jj-1) )
	1024	zv_trd(ji,jj) = - r1_12 * r1_e2v(ji,jj) * ( ftsw(ji,jj+1) * zwx(ji-1,jj+1) &
	1025	& + ftse(ji,jj+1) * zwx(ji ,jj+1) &
	1026	& + ftnw(ji,jj ) * zwx(ji-1,jj ) &
	1027	& + ftne(ji,jj ) * zwx(ji ,jj ) )
[358]	1028	END DO
	1029	END DO
[508]	1030	!
[9528]	1031	END SELECT
[4292]	1032	!
	1033	! Add tidal astronomical forcing if defined
[7646]	1034	IF ( ln_tide .AND. ln_tide_pot ) THEN
[4292]	1035	DO jj = 2, jpjm1
	1036	DO ji = fs_2, fs_jpim1 ! vector opt.
[5836]	1037	zu_spg = grav * ( pot_astro(ji+1,jj) - pot_astro(ji,jj) ) * r1_e1u(ji,jj)
	1038	zv_spg = grav * ( pot_astro(ji,jj+1) - pot_astro(ji,jj) ) * r1_e2v(ji,jj)
[4292]	1039	zu_trd(ji,jj) = zu_trd(ji,jj) + zu_spg
	1040	zv_trd(ji,jj) = zv_trd(ji,jj) + zv_spg
	1041	END DO
	1042	END DO
	1043	ENDIF
	1044	!
[9023]	1045	! Add bottom stresses:
	1046	!jth do implicitly instead
	1047	IF ( .NOT. ll_wd ) THEN ! Revert to explicit for bit comparison tests in non wad runs
[9045]	1048	DO jj = 2, jpjm1
	1049	DO ji = fs_2, fs_jpim1 ! vector opt.
	1050	zu_trd(ji,jj) = zu_trd(ji,jj) + zCdU_u(ji,jj) * un_e(ji,jj) * hur_e(ji,jj)
	1051	zv_trd(ji,jj) = zv_trd(ji,jj) + zCdU_v(ji,jj) * vn_e(ji,jj) * hvr_e(ji,jj)
	1052	END DO
	1053	END DO
[9023]	1054	ENDIF
[4292]	1055	!
	1056	! Surface pressure trend:
[9023]	1057	IF( ln_wd_il ) THEN
[6152]	1058	DO jj = 2, jpjm1
	1059	DO ji = 2, jpim1
	1060	! Add surface pressure gradient
	1061	zu_spg = - grav * ( zsshp2_e(ji+1,jj) - zsshp2_e(ji,jj) ) * r1_e1u(ji,jj)
	1062	zv_spg = - grav * ( zsshp2_e(ji,jj+1) - zsshp2_e(ji,jj) ) * r1_e2v(ji,jj)
[9023]	1063	zwx(ji,jj) = (1._wp - rn_scal_load) * zu_spg * zcpx(ji,jj)
	1064	zwy(ji,jj) = (1._wp - rn_scal_load) * zv_spg * zcpy(ji,jj)
[6152]	1065	END DO
	1066	END DO
	1067	ELSE
	1068	DO jj = 2, jpjm1
	1069	DO ji = fs_2, fs_jpim1 ! vector opt.
	1070	! Add surface pressure gradient
	1071	zu_spg = - grav * ( zsshp2_e(ji+1,jj) - zsshp2_e(ji,jj) ) * r1_e1u(ji,jj)
	1072	zv_spg = - grav * ( zsshp2_e(ji,jj+1) - zsshp2_e(ji,jj) ) * r1_e2v(ji,jj)
[9023]	1073	zwx(ji,jj) = (1._wp - rn_scal_load) * zu_spg
	1074	zwy(ji,jj) = (1._wp - rn_scal_load) * zv_spg
[6152]	1075	END DO
	1076	END DO
	1077	END IF
	1078
[4292]	1079	!
	1080	! Set next velocities:
[9023]	1081	IF( ln_dynadv_vec .OR. ln_linssh ) THEN !* Vector form
[4292]	1082	DO jj = 2, jpjm1
	1083	DO ji = fs_2, fs_jpim1 ! vector opt.
[5930]	1084	ua_e(ji,jj) = ( un_e(ji,jj) &
[4292]	1085	& + rdtbt * ( zwx(ji,jj) &
	1086	& + zu_trd(ji,jj) &
	1087	& + zu_frc(ji,jj) ) &
[6140]	1088	& ) * ssumask(ji,jj)
[358]	1089
[5930]	1090	va_e(ji,jj) = ( vn_e(ji,jj) &
[4292]	1091	& + rdtbt * ( zwy(ji,jj) &
	1092	& + zv_trd(ji,jj) &
	1093	& + zv_frc(ji,jj) ) &
[6140]	1094	& ) * ssvmask(ji,jj)
[9023]	1095
[4292]	1096	END DO
	1097	END DO
[6140]	1098	!
[9023]	1099	ELSE !* Flux form
[4292]	1100	DO jj = 2, jpjm1
	1101	DO ji = fs_2, fs_jpim1 ! vector opt.
[3294]	1102
[9023]	1103	zhura = hu_0(ji,jj) + zsshu_a(ji,jj)
	1104	zhvra = hv_0(ji,jj) + zsshv_a(ji,jj)
	1105
[6152]	1106	zhura = ssumask(ji,jj)/(zhura + 1._wp - ssumask(ji,jj))
	1107	zhvra = ssvmask(ji,jj)/(zhvra + 1._wp - ssvmask(ji,jj))
	1108
[5930]	1109	ua_e(ji,jj) = ( hu_e(ji,jj) * un_e(ji,jj) &
[4292]	1110	& + rdtbt * ( zhust_e(ji,jj) * zwx(ji,jj) &
	1111	& + zhup2_e(ji,jj) * zu_trd(ji,jj) &
[6140]	1112	& + hu_n(ji,jj) * zu_frc(ji,jj) ) &
[4292]	1113	& ) * zhura
[358]	1114
[5930]	1115	va_e(ji,jj) = ( hv_e(ji,jj) * vn_e(ji,jj) &
[4292]	1116	& + rdtbt * ( zhvst_e(ji,jj) * zwy(ji,jj) &
	1117	& + zhvp2_e(ji,jj) * zv_trd(ji,jj) &
[6140]	1118	& + hv_n(ji,jj) * zv_frc(ji,jj) ) &
[4292]	1119	& ) * zhvra
[592]	1120	END DO
	1121	END DO
[4292]	1122	ENDIF
[10272]	1123	!jth implicit bottom friction:
	1124	IF ( ll_wd ) THEN ! revert to explicit for bit comparison tests in non wad runs
	1125	DO jj = 2, jpjm1
	1126	DO ji = fs_2, fs_jpim1 ! vector opt.
	1127	ua_e(ji,jj) = ua_e(ji,jj) /(1.0 - rdtbt * zCdU_u(ji,jj) * hur_e(ji,jj))
	1128	va_e(ji,jj) = va_e(ji,jj) /(1.0 - rdtbt * zCdU_v(ji,jj) * hvr_e(ji,jj))
	1129	END DO
	1130	END DO
	1131	ENDIF
[9023]	1132
	1133
[6140]	1134	IF( .NOT.ln_linssh ) THEN !* Update ocean depth (variable volume case only)
[9023]	1135	hu_e (:,:) = hu_0(:,:) + zsshu_a(:,:)
	1136	hv_e (:,:) = hv_0(:,:) + zsshv_a(:,:)
[7753]	1137	hur_e(:,:) = ssumask(:,:) / ( hu_e(:,:) + 1._wp - ssumask(:,:) )
	1138	hvr_e(:,:) = ssvmask(:,:) / ( hv_e(:,:) + 1._wp - ssvmask(:,:) )
[1502]	1139	!
[1438]	1140	ENDIF
[6140]	1141	! !* domain lateral boundary
[10425]	1142	CALL lbc_lnk_multi( 'dynspg_ts', ua_e, 'U', -1._wp, va_e , 'V', -1._wp )
[4292]	1143	!
[6140]	1144	! ! open boundaries
[7646]	1145	IF( ln_bdy ) CALL bdy_dyn2d( jn, ua_e, va_e, un_e, vn_e, hur_e, hvr_e, ssha_e )
[4486]	1146	#if defined key_agrif
	1147	IF( .NOT.Agrif_Root() ) CALL agrif_dyn_ts( jn ) ! Agrif
[4292]	1148	#endif
	1149	! !* Swap
	1150	! ! ----
[7753]	1151	ubb_e (:,:) = ub_e (:,:)
	1152	ub_e (:,:) = un_e (:,:)
	1153	un_e (:,:) = ua_e (:,:)
	1154	!
	1155	vbb_e (:,:) = vb_e (:,:)
	1156	vb_e (:,:) = vn_e (:,:)
	1157	vn_e (:,:) = va_e (:,:)
	1158	!
	1159	sshbb_e(:,:) = sshb_e(:,:)
	1160	sshb_e (:,:) = sshn_e(:,:)
	1161	sshn_e (:,:) = ssha_e(:,:)
[4292]	1162
	1163	! !* Sum over whole bt loop
	1164	! ! ----------------------
	1165	za1 = wgtbtp1(jn)
[6140]	1166	IF( ln_dynadv_vec .OR. ln_linssh ) THEN ! Sum velocities
[7753]	1167	ua_b (:,:) = ua_b (:,:) + za1 * ua_e (:,:)
	1168	va_b (:,:) = va_b (:,:) + za1 * va_e (:,:)
[9023]	1169	ELSE ! Sum transports
	1170	IF ( .NOT.ln_wd_dl ) THEN
	1171	ua_b (:,:) = ua_b (:,:) + za1 * ua_e (:,:) * hu_e (:,:)
	1172	va_b (:,:) = va_b (:,:) + za1 * va_e (:,:) * hv_e (:,:)
	1173	ELSE
	1174	ua_b (:,:) = ua_b (:,:) + za1 * ua_e (:,:) * hu_e (:,:) * zuwdmask(:,:)
	1175	va_b (:,:) = va_b (:,:) + za1 * va_e (:,:) * hv_e (:,:) * zvwdmask(:,:)
	1176	END IF
[4292]	1177	ENDIF
[9023]	1178	! ! Sum sea level
[7753]	1179	ssha(:,:) = ssha(:,:) + za1 * ssha_e(:,:)
[9023]	1180
[358]	1181	! ! ==================== !
	1182	END DO ! end loop !
	1183	! ! ==================== !
[1438]	1184	! -----------------------------------------------------------------------------
[1502]	1185	! Phase 3. update the general trend with the barotropic trend
[1438]	1186	! -----------------------------------------------------------------------------
[1502]	1187	!
[4292]	1188	! Set advection velocity correction:
[9023]	1189	IF (ln_bt_fw) THEN
	1190	zwx(:,:) = un_adv(:,:)
	1191	zwy(:,:) = vn_adv(:,:)
	1192	IF( .NOT.( kt == nit000 .AND. neuler==0 ) ) THEN
[9043]	1193	un_adv(:,:) = r1_2 * ( ub2_b(:,:) + zwx(:,:) - atfp * un_bf(:,:) )
	1194	vn_adv(:,:) = r1_2 * ( vb2_b(:,:) + zwy(:,:) - atfp * vn_bf(:,:) )
[9023]	1195	!
	1196	! Update corrective fluxes for next time step:
	1197	un_bf(:,:) = atfp * un_bf(:,:) + (zwx(:,:) - ub2_b(:,:))
	1198	vn_bf(:,:) = atfp * vn_bf(:,:) + (zwy(:,:) - vb2_b(:,:))
	1199	ELSE
	1200	un_bf(:,:) = 0._wp
	1201	vn_bf(:,:) = 0._wp
	1202	END IF
	1203	! Save integrated transport for next computation
[7753]	1204	ub2_b(:,:) = zwx(:,:)
	1205	vb2_b(:,:) = zwy(:,:)
[4292]	1206	ENDIF
[9023]	1207
	1208
[4292]	1209	!
	1210	! Update barotropic trend:
[6140]	1211	IF( ln_dynadv_vec .OR. ln_linssh ) THEN
[4292]	1212	DO jk=1,jpkm1
[9043]	1213	ua(:,:,jk) = ua(:,:,jk) + ( ua_b(:,:) - ub_b(:,:) ) * r1_2dt_b
	1214	va(:,:,jk) = va(:,:,jk) + ( va_b(:,:) - vb_b(:,:) ) * r1_2dt_b
[4292]	1215	END DO
	1216	ELSE
[5930]	1217	! At this stage, ssha has been corrected: compute new depths at velocity points
	1218	DO jj = 1, jpjm1
	1219	DO ji = 1, jpim1 ! NO Vector Opt.
[9554]	1220	zsshu_a(ji,jj) = r1_2 * ssumask(ji,jj) * r1_e1e2u(ji,jj) &
	1221	& * ( e1e2t(ji ,jj) * ssha(ji ,jj) &
[5930]	1222	& + e1e2t(ji+1,jj) * ssha(ji+1,jj) )
[9554]	1223	zsshv_a(ji,jj) = r1_2 * ssvmask(ji,jj) * r1_e1e2v(ji,jj) &
	1224	& * ( e1e2t(ji,jj ) * ssha(ji,jj ) &
[5930]	1225	& + e1e2t(ji,jj+1) * ssha(ji,jj+1) )
	1226	END DO
	1227	END DO
[10425]	1228	CALL lbc_lnk_multi( 'dynspg_ts', zsshu_a, 'U', 1._wp, zsshv_a, 'V', 1._wp ) ! Boundary conditions
[5930]	1229	!
[4292]	1230	DO jk=1,jpkm1
[9043]	1231	ua(:,:,jk) = ua(:,:,jk) + r1_hu_n(:,:) * ( ua_b(:,:) - ub_b(:,:) * hu_b(:,:) ) * r1_2dt_b
	1232	va(:,:,jk) = va(:,:,jk) + r1_hv_n(:,:) * ( va_b(:,:) - vb_b(:,:) * hv_b(:,:) ) * r1_2dt_b
[4292]	1233	END DO
	1234	! Save barotropic velocities not transport:
[7753]	1235	ua_b(:,:) = ua_b(:,:) / ( hu_0(:,:) + zsshu_a(:,:) + 1._wp - ssumask(:,:) )
	1236	va_b(:,:) = va_b(:,:) / ( hv_0(:,:) + zsshv_a(:,:) + 1._wp - ssvmask(:,:) )
[4292]	1237	ENDIF
[9023]	1238
	1239
	1240	! Correct velocities so that the barotropic velocity equals (un_adv, vn_adv) (in all cases)
[4292]	1241	DO jk = 1, jpkm1
[9023]	1242	un(:,:,jk) = ( un(:,:,jk) + un_adv(:,:)r1_hu_n(:,:) - un_b(:,:) ) umask(:,:,jk)
	1243	vn(:,:,jk) = ( vn(:,:,jk) + vn_adv(:,:)r1_hv_n(:,:) - vn_b(:,:) ) vmask(:,:,jk)
[358]	1244	END DO
[9023]	1245
	1246	IF ( ln_wd_dl .and. ln_wd_dl_bc) THEN
	1247	DO jk = 1, jpkm1
[9109]	1248	un(:,:,jk) = ( un_adv(:,:)*r1_hu_n(:,:) &
	1249	& + zuwdav2(:,:)(un(:,:,jk) - un_adv(:,:)r1_hu_n(:,:)) ) * umask(:,:,jk)
	1250	vn(:,:,jk) = ( vn_adv(:,:)*r1_hv_n(:,:) &
	1251	& + zvwdav2(:,:)(vn(:,:,jk) - vn_adv(:,:)r1_hv_n(:,:)) ) * vmask(:,:,jk)
[9023]	1252	END DO
	1253	END IF
	1254
	1255
	1256	CALL iom_put( "ubar", un_adv(:,:)*r1_hu_n(:,:) ) ! barotropic i-current
	1257	CALL iom_put( "vbar", vn_adv(:,:)*r1_hv_n(:,:) ) ! barotropic i-current
[1502]	1258	!
[4486]	1259	#if defined key_agrif
	1260	! Save time integrated fluxes during child grid integration
[5656]	1261	! (used to update coarse grid transports at next time step)
[4486]	1262	!
[6140]	1263	IF( .NOT.Agrif_Root() .AND. ln_bt_fw ) THEN
	1264	IF( Agrif_NbStepint() == 0 ) THEN
[7753]	1265	ub2_i_b(:,:) = 0._wp
	1266	vb2_i_b(:,:) = 0._wp
[4486]	1267	END IF
	1268	!
	1269	za1 = 1._wp / REAL(Agrif_rhot(), wp)
[7753]	1270	ub2_i_b(:,:) = ub2_i_b(:,:) + za1 * ub2_b(:,:)
	1271	vb2_i_b(:,:) = vb2_i_b(:,:) + za1 * vb2_b(:,:)
[4486]	1272	ENDIF
	1273	#endif
[1502]	1274	! !* write time-spliting arrays in the restart
[6140]	1275	IF( lrst_oce .AND.ln_bt_fw ) CALL ts_rst( kt, 'WRITE' )
[508]	1276	!
[9023]	1277	IF( ln_wd_il ) DEALLOCATE( zcpx, zcpy )
	1278	IF( ln_wd_dl ) DEALLOCATE( ztwdmask, zuwdmask, zvwdmask, zuwdav2, zvwdav2 )
[1662]	1279	!
[9019]	1280	IF( ln_diatmb ) THEN
[9554]	1281	CALL iom_put( "baro_u" , un_bssumask(:,:)+zmdi(1.-ssumask(:,:) ) ) ! Barotropic U Velocity
	1282	CALL iom_put( "baro_v" , vn_bssvmask(:,:)+zmdi(1.-ssvmask(:,:) ) ) ! Barotropic V Velocity
[6140]	1283	ENDIF
[2715]	1284	!
[508]	1285	END SUBROUTINE dyn_spg_ts
	1286
[6140]	1287
[4292]	1288	SUBROUTINE ts_wgt( ll_av, ll_fw, jpit, zwgt1, zwgt2)
	1289	!!---------------------------------------------------------------------
	1290	!! * ROUTINE ts_wgt *
	1291	!!
	1292	!! ** Purpose : Set time-splitting weights for temporal averaging (or not)
	1293	!!----------------------------------------------------------------------
	1294	LOGICAL, INTENT(in) :: ll_av ! temporal averaging=.true.
	1295	LOGICAL, INTENT(in) :: ll_fw ! forward time splitting =.true.
	1296	INTEGER, INTENT(inout) :: jpit ! cycle length
	1297	REAL(wp), DIMENSION(3*nn_baro), INTENT(inout) :: zwgt1, & ! Primary weights
	1298	zwgt2 ! Secondary weights
	1299
	1300	INTEGER :: jic, jn, ji ! temporary integers
	1301	REAL(wp) :: za1, za2
	1302	!!----------------------------------------------------------------------
[508]	1303
[4292]	1304	zwgt1(:) = 0._wp
	1305	zwgt2(:) = 0._wp
	1306
	1307	! Set time index when averaged value is requested
	1308	IF (ll_fw) THEN
	1309	jic = nn_baro
	1310	ELSE
	1311	jic = 2 * nn_baro
	1312	ENDIF
	1313
	1314	! Set primary weights:
	1315	IF (ll_av) THEN
	1316	! Define simple boxcar window for primary weights
	1317	! (width = nn_baro, centered around jic)
	1318	SELECT CASE ( nn_bt_flt )
	1319	CASE( 0 ) ! No averaging
	1320	zwgt1(jic) = 1._wp
	1321	jpit = jic
	1322
	1323	CASE( 1 ) ! Boxcar, width = nn_baro
	1324	DO jn = 1, 3*nn_baro
	1325	za1 = ABS(float(jn-jic))/float(nn_baro)
	1326	IF (za1 < 0.5_wp) THEN
	1327	zwgt1(jn) = 1._wp
	1328	jpit = jn
	1329	ENDIF
	1330	ENDDO
	1331
	1332	CASE( 2 ) ! Boxcar, width = 2 * nn_baro
	1333	DO jn = 1, 3*nn_baro
	1334	za1 = ABS(float(jn-jic))/float(nn_baro)
	1335	IF (za1 < 1._wp) THEN
	1336	zwgt1(jn) = 1._wp
	1337	jpit = jn
	1338	ENDIF
	1339	ENDDO
	1340	CASE DEFAULT ; CALL ctl_stop( 'unrecognised value for nn_bt_flt' )
	1341	END SELECT
	1342
	1343	ELSE ! No time averaging
	1344	zwgt1(jic) = 1._wp
	1345	jpit = jic
	1346	ENDIF
	1347
	1348	! Set secondary weights
	1349	DO jn = 1, jpit
	1350	DO ji = jn, jpit
	1351	zwgt2(jn) = zwgt2(jn) + zwgt1(ji)
	1352	END DO
	1353	END DO
	1354
	1355	! Normalize weigths:
	1356	za1 = 1._wp / SUM(zwgt1(1:jpit))
	1357	za2 = 1._wp / SUM(zwgt2(1:jpit))
	1358	DO jn = 1, jpit
	1359	zwgt1(jn) = zwgt1(jn) * za1
	1360	zwgt2(jn) = zwgt2(jn) * za2
	1361	END DO
	1362	!
	1363	END SUBROUTINE ts_wgt
	1364
[6140]	1365
[508]	1366	SUBROUTINE ts_rst( kt, cdrw )
	1367	!!---------------------------------------------------------------------
	1368	!! * ROUTINE ts_rst *
	1369	!!
	1370	!! ** Purpose : Read or write time-splitting arrays in restart file
	1371	!!----------------------------------------------------------------------
[9528]	1372	INTEGER , INTENT(in) :: kt ! ocean time-step
	1373	CHARACTER(len=*), INTENT(in) :: cdrw ! "READ"/"WRITE" flag
[508]	1374	!!----------------------------------------------------------------------
	1375	!
[9506]	1376	IF( TRIM(cdrw) == 'READ' ) THEN ! Read/initialise
	1377	! ! ---------------
[10256]	1378	IF( ln_rstart .AND. ln_bt_fw .AND. (neuler/=0) ) THEN !* Read the restart file
[9506]	1379	CALL iom_get( numror, jpdom_autoglo, 'ub2_b' , ub2_b (:,:), ldxios = lrxios )
	1380	CALL iom_get( numror, jpdom_autoglo, 'vb2_b' , vb2_b (:,:), ldxios = lrxios )
	1381	CALL iom_get( numror, jpdom_autoglo, 'un_bf' , un_bf (:,:), ldxios = lrxios )
	1382	CALL iom_get( numror, jpdom_autoglo, 'vn_bf' , vn_bf (:,:), ldxios = lrxios )
	1383	IF( .NOT.ln_bt_av ) THEN
	1384	CALL iom_get( numror, jpdom_autoglo, 'sshbb_e' , sshbb_e(:,:), ldxios = lrxios )
	1385	CALL iom_get( numror, jpdom_autoglo, 'ubb_e' , ubb_e(:,:), ldxios = lrxios )
	1386	CALL iom_get( numror, jpdom_autoglo, 'vbb_e' , vbb_e(:,:), ldxios = lrxios )
	1387	CALL iom_get( numror, jpdom_autoglo, 'sshb_e' , sshb_e(:,:), ldxios = lrxios )
	1388	CALL iom_get( numror, jpdom_autoglo, 'ub_e' , ub_e(:,:), ldxios = lrxios )
	1389	CALL iom_get( numror, jpdom_autoglo, 'vb_e' , vb_e(:,:), ldxios = lrxios )
	1390	ENDIF
[4486]	1391	#if defined key_agrif
[9506]	1392	! Read time integrated fluxes
	1393	IF ( .NOT.Agrif_Root() ) THEN
	1394	CALL iom_get( numror, jpdom_autoglo, 'ub2_i_b' , ub2_i_b(:,:), ldxios = lrxios )
	1395	CALL iom_get( numror, jpdom_autoglo, 'vb2_i_b' , vb2_i_b(:,:), ldxios = lrxios )
	1396	ENDIF
	1397	#endif
	1398	ELSE !* Start from rest
	1399	IF(lwp) WRITE(numout,*)
	1400	IF(lwp) WRITE(numout,*) ' ==>>> start from rest: set barotropic values to 0'
	1401	ub2_b (:,:) = 0._wp ; vb2_b (:,:) = 0._wp ! used in the 1st interpol of agrif
	1402	un_adv(:,:) = 0._wp ; vn_adv(:,:) = 0._wp ! used in the 1st interpol of agrif
	1403	un_bf (:,:) = 0._wp ; vn_bf (:,:) = 0._wp ! used in the 1st update of agrif
	1404	#if defined key_agrif
	1405	IF ( .NOT.Agrif_Root() ) THEN
	1406	ub2_i_b(:,:) = 0._wp ; vb2_i_b(:,:) = 0._wp ! used in the 1st update of agrif
	1407	ENDIF
	1408	#endif
[4486]	1409	ENDIF
[9506]	1410	!
	1411	ELSEIF( TRIM(cdrw) == 'WRITE' ) THEN ! Create restart file
	1412	! ! -------------------
	1413	IF(lwp) WRITE(numout,*) '---- ts_rst ----'
[9367]	1414	IF( lwxios ) CALL iom_swap( cwxios_context )
	1415	CALL iom_rstput( kt, nitrst, numrow, 'ub2_b' , ub2_b (:,:), ldxios = lwxios )
	1416	CALL iom_rstput( kt, nitrst, numrow, 'vb2_b' , vb2_b (:,:), ldxios = lwxios )
	1417	CALL iom_rstput( kt, nitrst, numrow, 'un_bf' , un_bf (:,:), ldxios = lwxios )
	1418	CALL iom_rstput( kt, nitrst, numrow, 'vn_bf' , vn_bf (:,:), ldxios = lwxios )
[4292]	1419	!
	1420	IF (.NOT.ln_bt_av) THEN
[9367]	1421	CALL iom_rstput( kt, nitrst, numrow, 'sshbb_e' , sshbb_e(:,:), ldxios = lwxios )
	1422	CALL iom_rstput( kt, nitrst, numrow, 'ubb_e' , ubb_e(:,:), ldxios = lwxios )
	1423	CALL iom_rstput( kt, nitrst, numrow, 'vbb_e' , vbb_e(:,:), ldxios = lwxios )
	1424	CALL iom_rstput( kt, nitrst, numrow, 'sshb_e' , sshb_e(:,:), ldxios = lwxios )
	1425	CALL iom_rstput( kt, nitrst, numrow, 'ub_e' , ub_e(:,:), ldxios = lwxios )
	1426	CALL iom_rstput( kt, nitrst, numrow, 'vb_e' , vb_e(:,:), ldxios = lwxios )
[4292]	1427	ENDIF
[4486]	1428	#if defined key_agrif
	1429	! Save time integrated fluxes
	1430	IF ( .NOT.Agrif_Root() ) THEN
[9367]	1431	CALL iom_rstput( kt, nitrst, numrow, 'ub2_i_b' , ub2_i_b(:,:), ldxios = lwxios )
	1432	CALL iom_rstput( kt, nitrst, numrow, 'vb2_i_b' , vb2_i_b(:,:), ldxios = lwxios )
[4486]	1433	ENDIF
	1434	#endif
[9367]	1435	IF( lwxios ) CALL iom_swap( cxios_context )
[4292]	1436	ENDIF
	1437	!
	1438	END SUBROUTINE ts_rst
[2528]	1439
[6140]	1440
	1441	SUBROUTINE dyn_spg_ts_init
[4292]	1442	!!---------------------------------------------------------------------
	1443	!! * ROUTINE dyn_spg_ts_init *
	1444	!!
	1445	!! ** Purpose : Set time splitting options
	1446	!!----------------------------------------------------------------------
[6140]	1447	INTEGER :: ji ,jj ! dummy loop indices
	1448	REAL(wp) :: zxr2, zyr2, zcmax ! local scalar
[9019]	1449	REAL(wp), DIMENSION(jpi,jpj) :: zcu
[4292]	1450	!!----------------------------------------------------------------------
[4370]	1451	!
[5930]	1452	! Max courant number for ext. grav. waves
[4370]	1453	!
[5930]	1454	DO jj = 1, jpj
	1455	DO ji =1, jpi
	1456	zxr2 = r1_e1t(ji,jj) * r1_e1t(ji,jj)
	1457	zyr2 = r1_e2t(ji,jj) * r1_e2t(ji,jj)
[7646]	1458	zcu(ji,jj) = SQRT( grav * MAX(ht_0(ji,jj),0._wp) * (zxr2 + zyr2) )
[4370]	1459	END DO
[5930]	1460	END DO
	1461	!
[5836]	1462	zcmax = MAXVAL( zcu(:,:) )
[10425]	1463	CALL mpp_max( 'dynspg_ts', zcmax )
[2528]	1464
[4370]	1465	! Estimate number of iterations to satisfy a max courant number= rn_bt_cmax
[6140]	1466	IF( ln_bt_auto ) nn_baro = CEILING( rdt / rn_bt_cmax * zcmax)
[4292]	1467
[5836]	1468	rdtbt = rdt / REAL( nn_baro , wp )
[4292]	1469	zcmax = zcmax * rdtbt
[9023]	1470	! Print results
[4292]	1471	IF(lwp) WRITE(numout,*)
[9169]	1472	IF(lwp) WRITE(numout,*) 'dyn_spg_ts_init : split-explicit free surface'
	1473	IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~~~~'
[5930]	1474	IF( ln_bt_auto ) THEN
[9169]	1475	IF(lwp) WRITE(numout,*) ' ln_ts_auto =.true. Automatically set nn_baro '
[4370]	1476	IF(lwp) WRITE(numout,*) ' Max. courant number allowed: ', rn_bt_cmax
[4292]	1477	ELSE
[9169]	1478	IF(lwp) WRITE(numout,*) ' ln_ts_auto=.false.: Use nn_baro in namelist nn_baro = ', nn_baro
[358]	1479	ENDIF
[4292]	1480
	1481	IF(ln_bt_av) THEN
[9169]	1482	IF(lwp) WRITE(numout,*) ' ln_bt_av =.true. ==> Time averaging over nn_baro time steps is on '
[4292]	1483	ELSE
[9169]	1484	IF(lwp) WRITE(numout,*) ' ln_bt_av =.false. => No time averaging of barotropic variables '
[4292]	1485	ENDIF
[508]	1486	!
[4292]	1487	!
	1488	IF(ln_bt_fw) THEN
[4370]	1489	IF(lwp) WRITE(numout,*) ' ln_bt_fw=.true. => Forward integration of barotropic variables '
[4292]	1490	ELSE
[4370]	1491	IF(lwp) WRITE(numout,*) ' ln_bt_fw =.false.=> Centred integration of barotropic variables '
[4292]	1492	ENDIF
	1493	!
[4486]	1494	#if defined key_agrif
	1495	! Restrict the use of Agrif to the forward case only
[9023]	1496	!!! IF( .NOT.ln_bt_fw .AND. .NOT.Agrif_Root() ) CALL ctl_stop( 'AGRIF not implemented if ln_bt_fw=.FALSE.' )
[4486]	1497	#endif
	1498	!
[4370]	1499	IF(lwp) WRITE(numout,*) ' Time filter choice, nn_bt_flt: ', nn_bt_flt
[4292]	1500	SELECT CASE ( nn_bt_flt )
[6140]	1501	CASE( 0 ) ; IF(lwp) WRITE(numout,*) ' Dirac'
	1502	CASE( 1 ) ; IF(lwp) WRITE(numout,*) ' Boxcar: width = nn_baro'
	1503	CASE( 2 ) ; IF(lwp) WRITE(numout,) ' Boxcar: width = 2nn_baro'
[9169]	1504	CASE DEFAULT ; CALL ctl_stop( 'unrecognised value for nn_bt_flt: should 0,1, or 2' )
[4292]	1505	END SELECT
	1506	!
[4370]	1507	IF(lwp) WRITE(numout,*) ' '
	1508	IF(lwp) WRITE(numout,*) ' nn_baro = ', nn_baro
	1509	IF(lwp) WRITE(numout,*) ' Barotropic time step [s] is :', rdtbt
	1510	IF(lwp) WRITE(numout,*) ' Maximum Courant number is :', zcmax
	1511	!
[9023]	1512	IF(lwp) WRITE(numout,*) ' Time diffusion parameter rn_bt_alpha: ', rn_bt_alpha
	1513	IF ((ln_bt_av.AND.nn_bt_flt/=0).AND.(rn_bt_alpha>0._wp)) THEN
	1514	CALL ctl_stop( 'dynspg_ts ERROR: if rn_bt_alpha > 0, remove temporal averaging' )
	1515	ENDIF
	1516	!
[6140]	1517	IF( .NOT.ln_bt_av .AND. .NOT.ln_bt_fw ) THEN
[4292]	1518	CALL ctl_stop( 'dynspg_ts ERROR: No time averaging => only forward integration is possible' )
	1519	ENDIF
[6140]	1520	IF( zcmax>0.9_wp ) THEN
[4292]	1521	CALL ctl_stop( 'dynspg_ts ERROR: Maximum Courant number is greater than 0.9: Inc. nn_baro !' )
	1522	ENDIF
	1523	!
[9124]	1524	! ! Allocate time-splitting arrays
	1525	IF( dyn_spg_ts_alloc() /= 0 ) CALL ctl_stop('STOP', 'dyn_spg_init: failed to allocate dynspg_ts arrays' )
	1526	!
	1527	! ! read restart when needed
[9506]	1528	CALL ts_rst( nit000, 'READ' )
[9124]	1529	!
[9367]	1530	IF( lwxios ) THEN
	1531	! define variables in restart file when writing with XIOS
	1532	CALL iom_set_rstw_var_active('ub2_b')
	1533	CALL iom_set_rstw_var_active('vb2_b')
	1534	CALL iom_set_rstw_var_active('un_bf')
	1535	CALL iom_set_rstw_var_active('vn_bf')
	1536	!
	1537	IF (.NOT.ln_bt_av) THEN
	1538	CALL iom_set_rstw_var_active('sshbb_e')
	1539	CALL iom_set_rstw_var_active('ubb_e')
	1540	CALL iom_set_rstw_var_active('vbb_e')
	1541	CALL iom_set_rstw_var_active('sshb_e')
	1542	CALL iom_set_rstw_var_active('ub_e')
	1543	CALL iom_set_rstw_var_active('vb_e')
	1544	ENDIF
	1545	#if defined key_agrif
	1546	! Save time integrated fluxes
	1547	IF ( .NOT.Agrif_Root() ) THEN
	1548	CALL iom_set_rstw_var_active('ub2_i_b')
	1549	CALL iom_set_rstw_var_active('vb2_i_b')
	1550	ENDIF
	1551	#endif
	1552	ENDIF
	1553	!
[4292]	1554	END SUBROUTINE dyn_spg_ts_init
[508]	1555
[358]	1556	!!======================================================================
	1557	END MODULE dynspg_ts

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