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dynnxt.F90 in NEMO/trunk/src/OCE/DYN – NEMO

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source: NEMO/trunk/src/OCE/DYN/dynnxt.F90 @ 12026

Last change on this file since 12026 was 12026, checked in by davestorkey, 4 years ago
Small bug fixes to to initial Euler timestep and OFF timestepping to ensure bit comparison the IMMERSE_first_steps branch with the trunk. Tickets #2310, #2311, #2343 apply.
Property svn:keywords set to `Id`
File size: 18.8 KB

Rev	Line
[3]	1	MODULE dynnxt
[1502]	2	!!=========================================================================
[3]	3	!! * MODULE dynnxt *
	4	!! Ocean dynamics: time stepping
[1502]	5	!!=========================================================================
[1438]	6	!! History : OPA ! 1987-02 (P. Andrich, D. L Hostis) Original code
	7	!! ! 1990-10 (C. Levy, G. Madec)
	8	!! 7.0 ! 1993-03 (M. Guyon) symetrical conditions
	9	!! 8.0 ! 1997-02 (G. Madec & M. Imbard) opa, release 8.0
	10	!! 8.2 ! 1997-04 (A. Weaver) Euler forward step
	11	!! - ! 1997-06 (G. Madec) lateral boudary cond., lbc routine
	12	!! NEMO 1.0 ! 2002-08 (G. Madec) F90: Free form and module
	13	!! - ! 2002-10 (C. Talandier, A-M. Treguier) Open boundary cond.
	14	!! 2.0 ! 2005-11 (V. Garnier) Surface pressure gradient organization
	15	!! 2.3 ! 2007-07 (D. Storkey) Calls to BDY routines.
[1502]	16	!! 3.2 ! 2009-06 (G. Madec, R.Benshila) re-introduce the vvl option
[2528]	17	!! 3.3 ! 2010-09 (D. Storkey, E.O'Dea) Bug fix for BDY module
[2723]	18	!! 3.3 ! 2011-03 (P. Oddo) Bug fix for time-splitting+(BDY-OBC) and not VVL
[4292]	19	!! 3.5 ! 2013-07 (J. Chanut) Compliant with time splitting changes
[6140]	20	!! 3.6 ! 2014-04 (G. Madec) add the diagnostic of the time filter trends
[5930]	21	!! 3.7 ! 2015-11 (J. Chanut) Free surface simplification
[1502]	22	!!-------------------------------------------------------------------------
[1438]	23
[1502]	24	!!-------------------------------------------------------------------------
[6140]	25	!! dyn_nxt : obtain the next (after) horizontal velocity
[1502]	26	!!-------------------------------------------------------------------------
[6140]	27	USE oce ! ocean dynamics and tracers
	28	USE dom_oce ! ocean space and time domain
	29	USE sbc_oce ! Surface boundary condition: ocean fields
[9023]	30	USE sbcrnf ! river runoffs
[9361]	31	USE sbcisf ! ice shelf
[6140]	32	USE phycst ! physical constants
	33	USE dynadv ! dynamics: vector invariant versus flux form
	34	USE dynspg_ts ! surface pressure gradient: split-explicit scheme
	35	USE domvvl ! variable volume
[7646]	36	USE bdy_oce , ONLY: ln_bdy
[6140]	37	USE bdydta ! ocean open boundary conditions
	38	USE bdydyn ! ocean open boundary conditions
	39	USE bdyvol ! ocean open boundary condition (bdy_vol routines)
	40	USE trd_oce ! trends: ocean variables
	41	USE trddyn ! trend manager: dynamics
	42	USE trdken ! trend manager: kinetic energy
[4990]	43	!
[6140]	44	USE in_out_manager ! I/O manager
	45	USE iom ! I/O manager library
	46	USE lbclnk ! lateral boundary condition (or mpp link)
	47	USE lib_mpp ! MPP library
	48	USE prtctl ! Print control
	49	USE timing ! Timing
[2528]	50	#if defined key_agrif
[9570]	51	USE agrif_oce_interp
[2528]	52	#endif
[3]	53
	54	IMPLICIT NONE
	55	PRIVATE
	56
[1438]	57	PUBLIC dyn_nxt ! routine called by step.F90
	58
[2715]	59	!!----------------------------------------------------------------------
[9598]	60	!! NEMO/OCE 4.0 , NEMO Consortium (2018)
[1438]	61	!! $Id$
[10068]	62	!! Software governed by the CeCILL license (see ./LICENSE)
[2715]	63	!!----------------------------------------------------------------------
[3]	64	CONTAINS
	65
	66	SUBROUTINE dyn_nxt ( kt )
	67	!!----------------------------------------------------------------------
	68	!! * ROUTINE dyn_nxt *
	69	!!
[5930]	70	!! ** Purpose : Finalize after horizontal velocity. Apply the boundary
	71	!! condition on the after velocity, achieve the time stepping
[1502]	72	!! by applying the Asselin filter on now fields and swapping
	73	!! the fields.
[3]	74	!!
[5930]	75	!! ** Method : * Ensure after velocities transport matches time splitting
	76	!! estimate (ln_dynspg_ts=T)
[3]	77	!!
[1502]	78	!! * Apply lateral boundary conditions on after velocity
	79	!! at the local domain boundaries through lbc_lnk call,
[7646]	80	!! at the one-way open boundaries (ln_bdy=T),
[4990]	81	!! at the AGRIF zoom boundaries (lk_agrif=T)
[3]	82	!!
[1502]	83	!! * Apply the time filter applied and swap of the dynamics
	84	!! arrays to start the next time step:
	85	!! (ub,vb) = (un,vn) + atfp [ (ub,vb) + (ua,va) - 2 (un,vn) ]
	86	!! (un,vn) = (ua,va).
[6140]	87	!! Note that with flux form advection and non linear free surface,
	88	!! the time filter is applied on thickness weighted velocity.
	89	!! As a result, dyn_nxt MUST be called after tra_nxt.
[1502]	90	!!
	91	!! ** Action : ub,vb filtered before horizontal velocity of next time-step
	92	!! un,vn now horizontal velocity of next time-step
[3]	93	!!----------------------------------------------------------------------
	94	INTEGER, INTENT( in ) :: kt ! ocean time-step index
[2715]	95	!
[3]	96	INTEGER :: ji, jj, jk ! dummy loop indices
[6140]	97	INTEGER :: ikt ! local integers
	98	REAL(wp) :: zue3a, zue3n, zue3b, zuf, zcoef ! local scalars
[4990]	99	REAL(wp) :: zve3a, zve3n, zve3b, zvf, z1_2dt ! - -
[9019]	100	REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zue, zve
	101	REAL(wp), ALLOCATABLE, DIMENSION(:,:,:) :: ze3u_f, ze3v_f, zua, zva
[1502]	102	!!----------------------------------------------------------------------
[3294]	103	!
[9019]	104	IF( ln_timing ) CALL timing_start('dyn_nxt')
	105	IF( ln_dynspg_ts ) ALLOCATE( zue(jpi,jpj) , zve(jpi,jpj) )
	106	IF( l_trddyn ) ALLOCATE( zua(jpi,jpj,jpk) , zva(jpi,jpj,jpk) )
[3294]	107	!
[3]	108	IF( kt == nit000 ) THEN
	109	IF(lwp) WRITE(numout,*)
	110	IF(lwp) WRITE(numout,*) 'dyn_nxt : time stepping'
	111	IF(lwp) WRITE(numout,*) '~~~~~~~'
	112	ENDIF
	113
[5930]	114	IF ( ln_dynspg_ts ) THEN
	115	! Ensure below that barotropic velocities match time splitting estimate
	116	! Compute actual transport and replace it with ts estimate at "after" time step
[7753]	117	zue(:,:) = e3u_a(:,:,1) * ua(:,:,1) * umask(:,:,1)
	118	zve(:,:) = e3v_a(:,:,1) * va(:,:,1) * vmask(:,:,1)
[5930]	119	DO jk = 2, jpkm1
[7753]	120	zue(:,:) = zue(:,:) + e3u_a(:,:,jk) * ua(:,:,jk) * umask(:,:,jk)
	121	zve(:,:) = zve(:,:) + e3v_a(:,:,jk) * va(:,:,jk) * vmask(:,:,jk)
[1502]	122	END DO
	123	DO jk = 1, jpkm1
[7753]	124	ua(:,:,jk) = ( ua(:,:,jk) - zue(:,:) * r1_hu_a(:,:) + ua_b(:,:) ) * umask(:,:,jk)
	125	va(:,:,jk) = ( va(:,:,jk) - zve(:,:) * r1_hv_a(:,:) + va_b(:,:) ) * vmask(:,:,jk)
[592]	126	END DO
[6140]	127	!
	128	IF( .NOT.ln_bt_fw ) THEN
[5930]	129	! Remove advective velocity from "now velocities"
	130	! prior to asselin filtering
	131	! In the forward case, this is done below after asselin filtering
	132	! so that asselin contribution is removed at the same time
	133	DO jk = 1, jpkm1
[9023]	134	un(:,:,jk) = ( un(:,:,jk) - un_adv(:,:)r1_hu_n(:,:) + un_b(:,:) )umask(:,:,jk)
	135	vn(:,:,jk) = ( vn(:,:,jk) - vn_adv(:,:)r1_hv_n(:,:) + vn_b(:,:) )vmask(:,:,jk)
[7753]	136	END DO
[5930]	137	ENDIF
[4292]	138	ENDIF
	139
[1502]	140	! Update after velocity on domain lateral boundaries
	141	! --------------------------------------------------
[5930]	142	# if defined key_agrif
	143	CALL Agrif_dyn( kt ) !* AGRIF zoom boundaries
	144	# endif
	145	!
[10425]	146	CALL lbc_lnk_multi( 'dynnxt', ua, 'U', -1., va, 'V', -1. ) !* local domain boundaries
[1502]	147	!
	148	! !* BDY open boundaries
[7646]	149	IF( ln_bdy .AND. ln_dynspg_exp ) CALL bdy_dyn( kt )
	150	IF( ln_bdy .AND. ln_dynspg_ts ) CALL bdy_dyn( kt, dyn3d_only=.true. )
[3294]	151
	152	!!$ Do we need a call to bdy_vol here??
	153	!
[4990]	154	IF( l_trddyn ) THEN ! prepare the atf trend computation + some diagnostics
	155	z1_2dt = 1._wp / (2. * rdt) ! Euler or leap-frog time step
	156	IF( neuler == 0 .AND. kt == nit000 ) z1_2dt = 1._wp / rdt
	157	!
	158	! ! Kinetic energy and Conversion
	159	IF( ln_KE_trd ) CALL trd_dyn( ua, va, jpdyn_ken, kt )
	160	!
	161	IF( ln_dyn_trd ) THEN ! 3D output: total momentum trends
[7753]	162	zua(:,:,:) = ( ua(:,:,:) - ub(:,:,:) ) * z1_2dt
	163	zva(:,:,:) = ( va(:,:,:) - vb(:,:,:) ) * z1_2dt
[4990]	164	CALL iom_put( "utrd_tot", zua ) ! total momentum trends, except the asselin time filter
	165	CALL iom_put( "vtrd_tot", zva )
	166	ENDIF
	167	!
[7753]	168	zua(:,:,:) = un(:,:,:) ! save the now velocity before the asselin filter
	169	zva(:,:,:) = vn(:,:,:) ! (caution: there will be a shift by 1 timestep in the
	170	! ! computation of the asselin filter trends)
[4990]	171	ENDIF
	172
[1438]	173	! Time filter and swap of dynamics arrays
	174	! ------------------------------------------
[1502]	175	IF( neuler == 0 .AND. kt == nit000 ) THEN !* Euler at first time-step: only swap
	176	DO jk = 1, jpkm1
[12026]	177	ub(:,:,jk) = un(:,:,jk) ! ub <-- un
	178	vb(:,:,jk) = vn(:,:,jk)
[9226]	179	un(:,:,jk) = ua(:,:,jk) ! un <-- ua
[7753]	180	vn(:,:,jk) = va(:,:,jk)
[1438]	181	END DO
[9226]	182	IF( .NOT.ln_linssh ) THEN ! e3._b <-- e3._n
	183	!!gm BUG ???? I don't understand why it is not : e3._n <-- e3._a
[4292]	184	DO jk = 1, jpkm1
[9226]	185	! e3t_b(:,:,jk) = e3t_n(:,:,jk)
	186	! e3u_b(:,:,jk) = e3u_n(:,:,jk)
	187	! e3v_b(:,:,jk) = e3v_n(:,:,jk)
	188	!
	189	e3t_n(:,:,jk) = e3t_a(:,:,jk)
	190	e3u_n(:,:,jk) = e3u_a(:,:,jk)
	191	e3v_n(:,:,jk) = e3v_a(:,:,jk)
[6140]	192	END DO
[9226]	193	!!gm BUG end
[4292]	194	ENDIF
[9226]	195	!
	196
[1502]	197	ELSE !* Leap-Frog : Asselin filter and swap
[2528]	198	! ! =============!
[6140]	199	IF( ln_linssh ) THEN ! Fixed volume !
[2528]	200	! ! =============!
[1502]	201	DO jk = 1, jpkm1
[592]	202	DO jj = 1, jpj
[1502]	203	DO ji = 1, jpi
[4990]	204	zuf = un(ji,jj,jk) + atfp * ( ub(ji,jj,jk) - 2._wp * un(ji,jj,jk) + ua(ji,jj,jk) )
	205	zvf = vn(ji,jj,jk) + atfp * ( vb(ji,jj,jk) - 2._wp * vn(ji,jj,jk) + va(ji,jj,jk) )
[1502]	206	!
	207	ub(ji,jj,jk) = zuf ! ub <-- filtered velocity
	208	vb(ji,jj,jk) = zvf
	209	un(ji,jj,jk) = ua(ji,jj,jk) ! un <-- ua
	210	vn(ji,jj,jk) = va(ji,jj,jk)
	211	END DO
	212	END DO
	213	END DO
[2528]	214	! ! ================!
	215	ELSE ! Variable volume !
	216	! ! ================!
[4292]	217	! Before scale factor at t-points
	218	! (used as a now filtered scale factor until the swap)
	219	! ----------------------------------------------------
[9023]	220	DO jk = 1, jpkm1
	221	e3t_b(:,:,jk) = e3t_n(:,:,jk) + atfp * ( e3t_b(:,:,jk) - 2._wp * e3t_n(:,:,jk) + e3t_a(:,:,jk) )
	222	END DO
	223	! Add volume filter correction: compatibility with tracer advection scheme
	224	! => time filter + conservation correction (only at the first level)
	225	zcoef = atfp * rdt * r1_rau0
[9361]	226
	227	e3t_b(:,:,1) = e3t_b(:,:,1) - zcoef * ( emp_b(:,:) - emp(:,:) ) * tmask(:,:,1)
	228
	229	IF ( ln_rnf ) THEN
	230	IF( ln_rnf_depth ) THEN
	231	DO jk = 1, jpkm1 ! Deal with Rivers separetely, as can be through depth too
	232	DO jj = 1, jpj
	233	DO ji = 1, jpi
	234	IF( jk <= nk_rnf(ji,jj) ) THEN
	235	e3t_b(ji,jj,jk) = e3t_b(ji,jj,jk) - zcoef * ( - rnf_b(ji,jj) + rnf(ji,jj) ) &
[9119]	236	& * ( e3t_n(ji,jj,jk) / h_rnf(ji,jj) ) * tmask(ji,jj,jk)
[9361]	237	ENDIF
[9023]	238	ENDDO
	239	ENDDO
[9361]	240	ENDDO
	241	ELSE
	242	e3t_b(:,:,1) = e3t_b(:,:,1) - zcoef * ( -rnf_b(:,:) + rnf(:,:))*tmask(:,:,1)
	243	ENDIF
	244	END IF
	245
	246	IF ( ln_isf ) THEN ! if ice shelf melting
	247	DO jk = 1, jpkm1 ! Deal with isf separetely, as can be through depth too
[6140]	248	DO jj = 1, jpj
	249	DO ji = 1, jpi
[10349]	250	IF( misfkt(ji,jj) <=jk .and. jk < misfkb(ji,jj) ) THEN
	251	e3t_b(ji,jj,jk) = e3t_b(ji,jj,jk) - zcoef * ( fwfisf_b(ji,jj) - fwfisf(ji,jj) ) &
[9361]	252	& * ( e3t_n(ji,jj,jk) * r1_hisf_tbl(ji,jj) ) * tmask(ji,jj,jk)
[10349]	253	ELSEIF ( jk==misfkb(ji,jj) ) THEN
	254	e3t_b(ji,jj,jk) = e3t_b(ji,jj,jk) - zcoef * ( fwfisf_b(ji,jj) - fwfisf(ji,jj) ) &
	255	& * ( e3t_n(ji,jj,jk) * r1_hisf_tbl(ji,jj) ) * ralpha(ji,jj) * tmask(ji,jj,jk)
[9361]	256	ENDIF
[5643]	257	END DO
	258	END DO
[9361]	259	END DO
[9023]	260	END IF
[2528]	261	!
[6140]	262	IF( ln_dynadv_vec ) THEN ! Asselin filter applied on velocity
	263	! Before filtered scale factor at (u/v)-points
	264	CALL dom_vvl_interpol( e3t_b(:,:,:), e3u_b(:,:,:), 'U' )
	265	CALL dom_vvl_interpol( e3t_b(:,:,:), e3v_b(:,:,:), 'V' )
[4292]	266	DO jk = 1, jpkm1
	267	DO jj = 1, jpj
[2528]	268	DO ji = 1, jpi
[4292]	269	zuf = un(ji,jj,jk) + atfp * ( ub(ji,jj,jk) - 2._wp * un(ji,jj,jk) + ua(ji,jj,jk) )
	270	zvf = vn(ji,jj,jk) + atfp * ( vb(ji,jj,jk) - 2._wp * vn(ji,jj,jk) + va(ji,jj,jk) )
[2528]	271	!
	272	ub(ji,jj,jk) = zuf ! ub <-- filtered velocity
	273	vb(ji,jj,jk) = zvf
	274	un(ji,jj,jk) = ua(ji,jj,jk) ! un <-- ua
	275	vn(ji,jj,jk) = va(ji,jj,jk)
	276	END DO
	277	END DO
	278	END DO
	279	!
[6140]	280	ELSE ! Asselin filter applied on thickness weighted velocity
	281	!
[9019]	282	ALLOCATE( ze3u_f(jpi,jpj,jpk) , ze3v_f(jpi,jpj,jpk) )
[6140]	283	! Before filtered scale factor at (u/v)-points stored in ze3u_f, ze3v_f
	284	CALL dom_vvl_interpol( e3t_b(:,:,:), ze3u_f, 'U' )
	285	CALL dom_vvl_interpol( e3t_b(:,:,:), ze3v_f, 'V' )
[4292]	286	DO jk = 1, jpkm1
	287	DO jj = 1, jpj
[4312]	288	DO ji = 1, jpi
[6140]	289	zue3a = e3u_a(ji,jj,jk) * ua(ji,jj,jk)
	290	zve3a = e3v_a(ji,jj,jk) * va(ji,jj,jk)
	291	zue3n = e3u_n(ji,jj,jk) * un(ji,jj,jk)
	292	zve3n = e3v_n(ji,jj,jk) * vn(ji,jj,jk)
	293	zue3b = e3u_b(ji,jj,jk) * ub(ji,jj,jk)
	294	zve3b = e3v_b(ji,jj,jk) * vb(ji,jj,jk)
[2528]	295	!
[3294]	296	zuf = ( zue3n + atfp * ( zue3b - 2._wp * zue3n + zue3a ) ) / ze3u_f(ji,jj,jk)
	297	zvf = ( zve3n + atfp * ( zve3b - 2._wp * zve3n + zve3a ) ) / ze3v_f(ji,jj,jk)
[2528]	298	!
[3294]	299	ub(ji,jj,jk) = zuf ! ub <-- filtered velocity
[2528]	300	vb(ji,jj,jk) = zvf
[3294]	301	un(ji,jj,jk) = ua(ji,jj,jk) ! un <-- ua
[2528]	302	vn(ji,jj,jk) = va(ji,jj,jk)
	303	END DO
	304	END DO
	305	END DO
[7753]	306	e3u_b(:,:,1:jpkm1) = ze3u_f(:,:,1:jpkm1) ! e3u_b <-- filtered scale factor
	307	e3v_b(:,:,1:jpkm1) = ze3v_f(:,:,1:jpkm1)
[6140]	308	!
[9019]	309	DEALLOCATE( ze3u_f , ze3v_f )
[2528]	310	ENDIF
	311	!
[3]	312	ENDIF
[2528]	313	!
[6140]	314	IF( ln_dynspg_ts .AND. ln_bt_fw ) THEN
[4312]	315	! Revert "before" velocities to time split estimate
	316	! Doing it here also means that asselin filter contribution is removed
[7753]	317	zue(:,:) = e3u_b(:,:,1) * ub(:,:,1) * umask(:,:,1)
	318	zve(:,:) = e3v_b(:,:,1) * vb(:,:,1) * vmask(:,:,1)
[4990]	319	DO jk = 2, jpkm1
[7753]	320	zue(:,:) = zue(:,:) + e3u_b(:,:,jk) * ub(:,:,jk) * umask(:,:,jk)
	321	zve(:,:) = zve(:,:) + e3v_b(:,:,jk) * vb(:,:,jk) * vmask(:,:,jk)
[4370]	322	END DO
	323	DO jk = 1, jpkm1
[7753]	324	ub(:,:,jk) = ub(:,:,jk) - (zue(:,:) * r1_hu_n(:,:) - un_b(:,:)) * umask(:,:,jk)
	325	vb(:,:,jk) = vb(:,:,jk) - (zve(:,:) * r1_hv_n(:,:) - vn_b(:,:)) * vmask(:,:,jk)
[4292]	326	END DO
	327	ENDIF
	328	!
	329	ENDIF ! neuler =/0
[4354]	330	!
	331	! Set "now" and "before" barotropic velocities for next time step:
	332	! JC: Would be more clever to swap variables than to make a full vertical
	333	! integration
	334	!
[4370]	335	!
[6140]	336	IF(.NOT.ln_linssh ) THEN
[7753]	337	hu_b(:,:) = e3u_b(:,:,1) * umask(:,:,1)
	338	hv_b(:,:) = e3v_b(:,:,1) * vmask(:,:,1)
[6140]	339	DO jk = 2, jpkm1
[7753]	340	hu_b(:,:) = hu_b(:,:) + e3u_b(:,:,jk) * umask(:,:,jk)
	341	hv_b(:,:) = hv_b(:,:) + e3v_b(:,:,jk) * vmask(:,:,jk)
[4354]	342	END DO
[7753]	343	r1_hu_b(:,:) = ssumask(:,:) / ( hu_b(:,:) + 1._wp - ssumask(:,:) )
	344	r1_hv_b(:,:) = ssvmask(:,:) / ( hv_b(:,:) + 1._wp - ssvmask(:,:) )
[4354]	345	ENDIF
	346	!
[7753]	347	un_b(:,:) = e3u_a(:,:,1) * un(:,:,1) * umask(:,:,1)
	348	ub_b(:,:) = e3u_b(:,:,1) * ub(:,:,1) * umask(:,:,1)
	349	vn_b(:,:) = e3v_a(:,:,1) * vn(:,:,1) * vmask(:,:,1)
	350	vb_b(:,:) = e3v_b(:,:,1) * vb(:,:,1) * vmask(:,:,1)
[6140]	351	DO jk = 2, jpkm1
[7753]	352	un_b(:,:) = un_b(:,:) + e3u_a(:,:,jk) * un(:,:,jk) * umask(:,:,jk)
	353	ub_b(:,:) = ub_b(:,:) + e3u_b(:,:,jk) * ub(:,:,jk) * umask(:,:,jk)
	354	vn_b(:,:) = vn_b(:,:) + e3v_a(:,:,jk) * vn(:,:,jk) * vmask(:,:,jk)
	355	vb_b(:,:) = vb_b(:,:) + e3v_b(:,:,jk) * vb(:,:,jk) * vmask(:,:,jk)
[4354]	356	END DO
[7753]	357	un_b(:,:) = un_b(:,:) * r1_hu_a(:,:)
	358	vn_b(:,:) = vn_b(:,:) * r1_hv_a(:,:)
	359	ub_b(:,:) = ub_b(:,:) * r1_hu_b(:,:)
	360	vb_b(:,:) = vb_b(:,:) * r1_hv_b(:,:)
[4354]	361	!
[6140]	362	IF( .NOT.ln_dynspg_ts ) THEN ! output the barotropic currents
	363	CALL iom_put( "ubar", un_b(:,:) )
	364	CALL iom_put( "vbar", vn_b(:,:) )
	365	ENDIF
[4990]	366	IF( l_trddyn ) THEN ! 3D output: asselin filter trends on momentum
[7753]	367	zua(:,:,:) = ( ub(:,:,:) - zua(:,:,:) ) * z1_2dt
	368	zva(:,:,:) = ( vb(:,:,:) - zva(:,:,:) ) * z1_2dt
[4990]	369	CALL trd_dyn( zua, zva, jpdyn_atf, kt )
	370	ENDIF
	371	!
[1438]	372	IF(ln_ctl) CALL prt_ctl( tab3d_1=un, clinfo1=' nxt - Un: ', mask1=umask, &
	373	& tab3d_2=vn, clinfo2=' Vn: ' , mask2=vmask )
[6140]	374	!
[9019]	375	IF( ln_dynspg_ts ) DEALLOCATE( zue, zve )
	376	IF( l_trddyn ) DEALLOCATE( zua, zva )
	377	IF( ln_timing ) CALL timing_stop('dyn_nxt')
[2715]	378	!
[3]	379	END SUBROUTINE dyn_nxt
	380
[1502]	381	!!=========================================================================
[3]	382	END MODULE dynnxt

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