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dynnxt.F90 @ 15422

Last change on this file since 15422 was 15422, checked in by jcastill, 3 years ago
Changes tested so that they can merged with the CO9 Met Office branch - jpmax_harmo should be 34 with FES14 tides, but the last components are not used anyway
File size: 22.7 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
[15422]	35	USE dynspg
[6140]	36	USE domvvl ! variable volume
[13284]	37	USE bdy_oce , ONLY : ln_bdy
[6140]	38	USE bdydta ! ocean open boundary conditions
	39	USE bdydyn ! ocean open boundary conditions
	40	USE bdyvol ! ocean open boundary condition (bdy_vol routines)
	41	USE trd_oce ! trends: ocean variables
	42	USE trddyn ! trend manager: dynamics
	43	USE trdken ! trend manager: kinetic energy
[4990]	44	!
[6140]	45	USE in_out_manager ! I/O manager
	46	USE iom ! I/O manager library
	47	USE lbclnk ! lateral boundary condition (or mpp link)
	48	USE lib_mpp ! MPP library
	49	USE prtctl ! Print control
	50	USE timing ! Timing
[13284]	51	USE zdfdrg , ONLY : ln_drgice_imp, rCdU_top
[2528]	52	#if defined key_agrif
[9570]	53	USE agrif_oce_interp
[2528]	54	#endif
[3]	55
	56	IMPLICIT NONE
	57	PRIVATE
	58
[1438]	59	PUBLIC dyn_nxt ! routine called by step.F90
	60
[15422]	61	!! Substitution
	62	# include "vectopt_loop_substitute.h90"
[2715]	63	!!----------------------------------------------------------------------
[9598]	64	!! NEMO/OCE 4.0 , NEMO Consortium (2018)
[14075]	65	!! $Id$
[10068]	66	!! Software governed by the CeCILL license (see ./LICENSE)
[2715]	67	!!----------------------------------------------------------------------
[3]	68	CONTAINS
	69
	70	SUBROUTINE dyn_nxt ( kt )
	71	!!----------------------------------------------------------------------
	72	!! * ROUTINE dyn_nxt *
	73	!!
[5930]	74	!! ** Purpose : Finalize after horizontal velocity. Apply the boundary
	75	!! condition on the after velocity, achieve the time stepping
[1502]	76	!! by applying the Asselin filter on now fields and swapping
	77	!! the fields.
[3]	78	!!
[5930]	79	!! ** Method : * Ensure after velocities transport matches time splitting
	80	!! estimate (ln_dynspg_ts=T)
[3]	81	!!
[1502]	82	!! * Apply lateral boundary conditions on after velocity
	83	!! at the local domain boundaries through lbc_lnk call,
[7646]	84	!! at the one-way open boundaries (ln_bdy=T),
[4990]	85	!! at the AGRIF zoom boundaries (lk_agrif=T)
[3]	86	!!
[1502]	87	!! * Apply the time filter applied and swap of the dynamics
	88	!! arrays to start the next time step:
	89	!! (ub,vb) = (un,vn) + atfp [ (ub,vb) + (ua,va) - 2 (un,vn) ]
	90	!! (un,vn) = (ua,va).
[6140]	91	!! Note that with flux form advection and non linear free surface,
	92	!! the time filter is applied on thickness weighted velocity.
	93	!! As a result, dyn_nxt MUST be called after tra_nxt.
[1502]	94	!!
	95	!! ** Action : ub,vb filtered before horizontal velocity of next time-step
	96	!! un,vn now horizontal velocity of next time-step
[3]	97	!!----------------------------------------------------------------------
	98	INTEGER, INTENT( in ) :: kt ! ocean time-step index
[2715]	99	!
[3]	100	INTEGER :: ji, jj, jk ! dummy loop indices
[6140]	101	INTEGER :: ikt ! local integers
	102	REAL(wp) :: zue3a, zue3n, zue3b, zuf, zcoef ! local scalars
[4990]	103	REAL(wp) :: zve3a, zve3n, zve3b, zvf, z1_2dt ! - -
[9019]	104	REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zue, zve
[13284]	105	REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zutau, zvtau
[9019]	106	REAL(wp), ALLOCATABLE, DIMENSION(:,:,:) :: ze3u_f, ze3v_f, zua, zva
[1502]	107	!!----------------------------------------------------------------------
[3294]	108	!
[9019]	109	IF( ln_timing ) CALL timing_start('dyn_nxt')
	110	IF( ln_dynspg_ts ) ALLOCATE( zue(jpi,jpj) , zve(jpi,jpj) )
	111	IF( l_trddyn ) ALLOCATE( zua(jpi,jpj,jpk) , zva(jpi,jpj,jpk) )
[3294]	112	!
[3]	113	IF( kt == nit000 ) THEN
	114	IF(lwp) WRITE(numout,*)
	115	IF(lwp) WRITE(numout,*) 'dyn_nxt : time stepping'
	116	IF(lwp) WRITE(numout,*) '~~~~~~~'
	117	ENDIF
	118
[5930]	119	IF ( ln_dynspg_ts ) THEN
	120	! Ensure below that barotropic velocities match time splitting estimate
	121	! Compute actual transport and replace it with ts estimate at "after" time step
[7753]	122	zue(:,:) = e3u_a(:,:,1) * ua(:,:,1) * umask(:,:,1)
	123	zve(:,:) = e3v_a(:,:,1) * va(:,:,1) * vmask(:,:,1)
[5930]	124	DO jk = 2, jpkm1
[7753]	125	zue(:,:) = zue(:,:) + e3u_a(:,:,jk) * ua(:,:,jk) * umask(:,:,jk)
	126	zve(:,:) = zve(:,:) + e3v_a(:,:,jk) * va(:,:,jk) * vmask(:,:,jk)
[1502]	127	END DO
	128	DO jk = 1, jpkm1
[7753]	129	ua(:,:,jk) = ( ua(:,:,jk) - zue(:,:) * r1_hu_a(:,:) + ua_b(:,:) ) * umask(:,:,jk)
	130	va(:,:,jk) = ( va(:,:,jk) - zve(:,:) * r1_hv_a(:,:) + va_b(:,:) ) * vmask(:,:,jk)
[592]	131	END DO
[6140]	132	!
	133	IF( .NOT.ln_bt_fw ) THEN
[5930]	134	! Remove advective velocity from "now velocities"
	135	! prior to asselin filtering
	136	! In the forward case, this is done below after asselin filtering
	137	! so that asselin contribution is removed at the same time
	138	DO jk = 1, jpkm1
[9023]	139	un(:,:,jk) = ( un(:,:,jk) - un_adv(:,:)r1_hu_n(:,:) + un_b(:,:) )umask(:,:,jk)
	140	vn(:,:,jk) = ( vn(:,:,jk) - vn_adv(:,:)r1_hv_n(:,:) + vn_b(:,:) )vmask(:,:,jk)
[7753]	141	END DO
[5930]	142	ENDIF
[4292]	143	ENDIF
	144
[1502]	145	! Update after velocity on domain lateral boundaries
	146	! --------------------------------------------------
[5930]	147	# if defined key_agrif
	148	CALL Agrif_dyn( kt ) !* AGRIF zoom boundaries
	149	# endif
	150	!
[10425]	151	CALL lbc_lnk_multi( 'dynnxt', ua, 'U', -1., va, 'V', -1. ) !* local domain boundaries
[1502]	152	!
	153	! !* BDY open boundaries
[7646]	154	IF( ln_bdy .AND. ln_dynspg_exp ) CALL bdy_dyn( kt )
	155	IF( ln_bdy .AND. ln_dynspg_ts ) CALL bdy_dyn( kt, dyn3d_only=.true. )
[3294]	156
	157	!!$ Do we need a call to bdy_vol here??
	158	!
[4990]	159	IF( l_trddyn ) THEN ! prepare the atf trend computation + some diagnostics
	160	z1_2dt = 1._wp / (2. * rdt) ! Euler or leap-frog time step
	161	IF( neuler == 0 .AND. kt == nit000 ) z1_2dt = 1._wp / rdt
	162	!
	163	! ! Kinetic energy and Conversion
	164	IF( ln_KE_trd ) CALL trd_dyn( ua, va, jpdyn_ken, kt )
	165	!
	166	IF( ln_dyn_trd ) THEN ! 3D output: total momentum trends
[7753]	167	zua(:,:,:) = ( ua(:,:,:) - ub(:,:,:) ) * z1_2dt
	168	zva(:,:,:) = ( va(:,:,:) - vb(:,:,:) ) * z1_2dt
[4990]	169	CALL iom_put( "utrd_tot", zua ) ! total momentum trends, except the asselin time filter
	170	CALL iom_put( "vtrd_tot", zva )
	171	ENDIF
	172	!
[7753]	173	zua(:,:,:) = un(:,:,:) ! save the now velocity before the asselin filter
	174	zva(:,:,:) = vn(:,:,:) ! (caution: there will be a shift by 1 timestep in the
	175	! ! computation of the asselin filter trends)
[4990]	176	ENDIF
	177
[1438]	178	! Time filter and swap of dynamics arrays
	179	! ------------------------------------------
[1502]	180	IF( neuler == 0 .AND. kt == nit000 ) THEN !* Euler at first time-step: only swap
	181	DO jk = 1, jpkm1
[12026]	182	ub(:,:,jk) = un(:,:,jk) ! ub <-- un
	183	vb(:,:,jk) = vn(:,:,jk)
[9226]	184	un(:,:,jk) = ua(:,:,jk) ! un <-- ua
[7753]	185	vn(:,:,jk) = va(:,:,jk)
[1438]	186	END DO
[15422]	187	! limit velocities
	188	IF (ln_ulimit) THEN
	189	call dyn_limit_velocity (kt)
	190	ENDIF
[9226]	191	IF( .NOT.ln_linssh ) THEN ! e3._b <-- e3._n
	192	!!gm BUG ???? I don't understand why it is not : e3._n <-- e3._a
[4292]	193	DO jk = 1, jpkm1
[9226]	194	! e3t_b(:,:,jk) = e3t_n(:,:,jk)
	195	! e3u_b(:,:,jk) = e3u_n(:,:,jk)
	196	! e3v_b(:,:,jk) = e3v_n(:,:,jk)
	197	!
	198	e3t_n(:,:,jk) = e3t_a(:,:,jk)
	199	e3u_n(:,:,jk) = e3u_a(:,:,jk)
	200	e3v_n(:,:,jk) = e3v_a(:,:,jk)
[6140]	201	END DO
[9226]	202	!!gm BUG end
[4292]	203	ENDIF
[9226]	204	!
	205
[1502]	206	ELSE !* Leap-Frog : Asselin filter and swap
[2528]	207	! ! =============!
[6140]	208	IF( ln_linssh ) THEN ! Fixed volume !
[2528]	209	! ! =============!
[1502]	210	DO jk = 1, jpkm1
[592]	211	DO jj = 1, jpj
[1502]	212	DO ji = 1, jpi
[4990]	213	zuf = un(ji,jj,jk) + atfp * ( ub(ji,jj,jk) - 2._wp * un(ji,jj,jk) + ua(ji,jj,jk) )
	214	zvf = vn(ji,jj,jk) + atfp * ( vb(ji,jj,jk) - 2._wp * vn(ji,jj,jk) + va(ji,jj,jk) )
[1502]	215	!
	216	ub(ji,jj,jk) = zuf ! ub <-- filtered velocity
	217	vb(ji,jj,jk) = zvf
	218	un(ji,jj,jk) = ua(ji,jj,jk) ! un <-- ua
	219	vn(ji,jj,jk) = va(ji,jj,jk)
	220	END DO
	221	END DO
	222	END DO
[15422]	223	! limit velocities
	224	IF (ln_ulimit) THEN
	225	call dyn_limit_velocity (kt)
	226	ENDIF
[2528]	227	! ! ================!
	228	ELSE ! Variable volume !
	229	! ! ================!
[4292]	230	! Before scale factor at t-points
	231	! (used as a now filtered scale factor until the swap)
	232	! ----------------------------------------------------
[9023]	233	DO jk = 1, jpkm1
	234	e3t_b(:,:,jk) = e3t_n(:,:,jk) + atfp * ( e3t_b(:,:,jk) - 2._wp * e3t_n(:,:,jk) + e3t_a(:,:,jk) )
	235	END DO
	236	! Add volume filter correction: compatibility with tracer advection scheme
	237	! => time filter + conservation correction (only at the first level)
	238	zcoef = atfp * rdt * r1_rau0
[9361]	239
[12279]	240	DO jk = 1, jpkm1
	241	e3t_b(:,:,jk) = e3t_b(:,:,jk) - zcoef * ( emp_b(:,:) - emp(:,:) ) * tmask(:,:,jk) &
	242	& * e3t_n(:,:,jk) / ( ht_n(:,:) + 1._wp - ssmask(:,:) )
	243	END DO
[9361]	244
	245	IF ( ln_rnf ) THEN
[12279]	246	DO jk = 1, jpkm1
[12366]	247	e3t_b(:,:,jk) = e3t_b(:,:,jk) + zcoef * ( rnf_b(:,:) - rnf(:,:) ) * tmask(:,:,jk) &
[12279]	248	& * e3t_n(:,:,jk) / ( ht_n(:,:) + 1._wp - ssmask(:,:) )
	249	END DO
	250	ENDIF
[9361]	251
[12279]	252	IF ( ln_isf ) THEN
	253	DO jk = 1, jpkm1
	254	e3t_b(:,:,jk) = e3t_b(:,:,jk) - zcoef * ( fwfisf_b(:,:) - fwfisf(:,:) ) * tmask(:,:,jk) &
	255	& * e3t_n(:,:,jk) / ( ht_n(:,:) + 1._wp - ssmask(:,:) )
[9361]	256	END DO
[12279]	257	ENDIF
[2528]	258	!
[6140]	259	IF( ln_dynadv_vec ) THEN ! Asselin filter applied on velocity
	260	! Before filtered scale factor at (u/v)-points
	261	CALL dom_vvl_interpol( e3t_b(:,:,:), e3u_b(:,:,:), 'U' )
	262	CALL dom_vvl_interpol( e3t_b(:,:,:), e3v_b(:,:,:), 'V' )
[4292]	263	DO jk = 1, jpkm1
	264	DO jj = 1, jpj
[2528]	265	DO ji = 1, jpi
[4292]	266	zuf = un(ji,jj,jk) + atfp * ( ub(ji,jj,jk) - 2._wp * un(ji,jj,jk) + ua(ji,jj,jk) )
	267	zvf = vn(ji,jj,jk) + atfp * ( vb(ji,jj,jk) - 2._wp * vn(ji,jj,jk) + va(ji,jj,jk) )
[2528]	268	!
	269	ub(ji,jj,jk) = zuf ! ub <-- filtered velocity
	270	vb(ji,jj,jk) = zvf
	271	un(ji,jj,jk) = ua(ji,jj,jk) ! un <-- ua
	272	vn(ji,jj,jk) = va(ji,jj,jk)
	273	END DO
	274	END DO
	275	END DO
[15422]	276	! limit velocities
	277	IF (ln_ulimit) THEN
	278	call dyn_limit_velocity (kt)
	279	ENDIF
[2528]	280	!
[6140]	281	ELSE ! Asselin filter applied on thickness weighted velocity
	282	!
[9019]	283	ALLOCATE( ze3u_f(jpi,jpj,jpk) , ze3v_f(jpi,jpj,jpk) )
[6140]	284	! Before filtered scale factor at (u/v)-points stored in ze3u_f, ze3v_f
	285	CALL dom_vvl_interpol( e3t_b(:,:,:), ze3u_f, 'U' )
	286	CALL dom_vvl_interpol( e3t_b(:,:,:), ze3v_f, 'V' )
[4292]	287	DO jk = 1, jpkm1
	288	DO jj = 1, jpj
[4312]	289	DO ji = 1, jpi
[6140]	290	zue3a = e3u_a(ji,jj,jk) * ua(ji,jj,jk)
	291	zve3a = e3v_a(ji,jj,jk) * va(ji,jj,jk)
	292	zue3n = e3u_n(ji,jj,jk) * un(ji,jj,jk)
	293	zve3n = e3v_n(ji,jj,jk) * vn(ji,jj,jk)
	294	zue3b = e3u_b(ji,jj,jk) * ub(ji,jj,jk)
	295	zve3b = e3v_b(ji,jj,jk) * vb(ji,jj,jk)
[2528]	296	!
[3294]	297	zuf = ( zue3n + atfp * ( zue3b - 2._wp * zue3n + zue3a ) ) / ze3u_f(ji,jj,jk)
	298	zvf = ( zve3n + atfp * ( zve3b - 2._wp * zve3n + zve3a ) ) / ze3v_f(ji,jj,jk)
[2528]	299	!
[3294]	300	ub(ji,jj,jk) = zuf ! ub <-- filtered velocity
[2528]	301	vb(ji,jj,jk) = zvf
[3294]	302	un(ji,jj,jk) = ua(ji,jj,jk) ! un <-- ua
[2528]	303	vn(ji,jj,jk) = va(ji,jj,jk)
	304	END DO
	305	END DO
	306	END DO
[15422]	307	! limit velocities
	308	IF (ln_ulimit) THEN
	309	call dyn_limit_velocity (kt)
	310	ENDIF
[7753]	311	e3u_b(:,:,1:jpkm1) = ze3u_f(:,:,1:jpkm1) ! e3u_b <-- filtered scale factor
	312	e3v_b(:,:,1:jpkm1) = ze3v_f(:,:,1:jpkm1)
[6140]	313	!
[9019]	314	DEALLOCATE( ze3u_f , ze3v_f )
[2528]	315	ENDIF
	316	!
[3]	317	ENDIF
[2528]	318	!
[6140]	319	IF( ln_dynspg_ts .AND. ln_bt_fw ) THEN
[4312]	320	! Revert "before" velocities to time split estimate
	321	! Doing it here also means that asselin filter contribution is removed
[7753]	322	zue(:,:) = e3u_b(:,:,1) * ub(:,:,1) * umask(:,:,1)
	323	zve(:,:) = e3v_b(:,:,1) * vb(:,:,1) * vmask(:,:,1)
[4990]	324	DO jk = 2, jpkm1
[7753]	325	zue(:,:) = zue(:,:) + e3u_b(:,:,jk) * ub(:,:,jk) * umask(:,:,jk)
	326	zve(:,:) = zve(:,:) + e3v_b(:,:,jk) * vb(:,:,jk) * vmask(:,:,jk)
[4370]	327	END DO
	328	DO jk = 1, jpkm1
[7753]	329	ub(:,:,jk) = ub(:,:,jk) - (zue(:,:) * r1_hu_n(:,:) - un_b(:,:)) * umask(:,:,jk)
	330	vb(:,:,jk) = vb(:,:,jk) - (zve(:,:) * r1_hv_n(:,:) - vn_b(:,:)) * vmask(:,:,jk)
[4292]	331	END DO
	332	ENDIF
	333	!
	334	ENDIF ! neuler =/0
[4354]	335	!
	336	! Set "now" and "before" barotropic velocities for next time step:
	337	! JC: Would be more clever to swap variables than to make a full vertical
	338	! integration
	339	!
[4370]	340	!
[6140]	341	IF(.NOT.ln_linssh ) THEN
[7753]	342	hu_b(:,:) = e3u_b(:,:,1) * umask(:,:,1)
	343	hv_b(:,:) = e3v_b(:,:,1) * vmask(:,:,1)
[6140]	344	DO jk = 2, jpkm1
[7753]	345	hu_b(:,:) = hu_b(:,:) + e3u_b(:,:,jk) * umask(:,:,jk)
	346	hv_b(:,:) = hv_b(:,:) + e3v_b(:,:,jk) * vmask(:,:,jk)
[4354]	347	END DO
[7753]	348	r1_hu_b(:,:) = ssumask(:,:) / ( hu_b(:,:) + 1._wp - ssumask(:,:) )
	349	r1_hv_b(:,:) = ssvmask(:,:) / ( hv_b(:,:) + 1._wp - ssvmask(:,:) )
[4354]	350	ENDIF
	351	!
[7753]	352	un_b(:,:) = e3u_a(:,:,1) * un(:,:,1) * umask(:,:,1)
	353	ub_b(:,:) = e3u_b(:,:,1) * ub(:,:,1) * umask(:,:,1)
	354	vn_b(:,:) = e3v_a(:,:,1) * vn(:,:,1) * vmask(:,:,1)
	355	vb_b(:,:) = e3v_b(:,:,1) * vb(:,:,1) * vmask(:,:,1)
[6140]	356	DO jk = 2, jpkm1
[7753]	357	un_b(:,:) = un_b(:,:) + e3u_a(:,:,jk) * un(:,:,jk) * umask(:,:,jk)
	358	ub_b(:,:) = ub_b(:,:) + e3u_b(:,:,jk) * ub(:,:,jk) * umask(:,:,jk)
	359	vn_b(:,:) = vn_b(:,:) + e3v_a(:,:,jk) * vn(:,:,jk) * vmask(:,:,jk)
	360	vb_b(:,:) = vb_b(:,:) + e3v_b(:,:,jk) * vb(:,:,jk) * vmask(:,:,jk)
[4354]	361	END DO
[7753]	362	un_b(:,:) = un_b(:,:) * r1_hu_a(:,:)
	363	vn_b(:,:) = vn_b(:,:) * r1_hv_a(:,:)
	364	ub_b(:,:) = ub_b(:,:) * r1_hu_b(:,:)
	365	vb_b(:,:) = vb_b(:,:) * r1_hv_b(:,:)
[4354]	366	!
[6140]	367	IF( .NOT.ln_dynspg_ts ) THEN ! output the barotropic currents
	368	CALL iom_put( "ubar", un_b(:,:) )
	369	CALL iom_put( "vbar", vn_b(:,:) )
	370	ENDIF
[4990]	371	IF( l_trddyn ) THEN ! 3D output: asselin filter trends on momentum
[7753]	372	zua(:,:,:) = ( ub(:,:,:) - zua(:,:,:) ) * z1_2dt
	373	zva(:,:,:) = ( vb(:,:,:) - zva(:,:,:) ) * z1_2dt
[4990]	374	CALL trd_dyn( zua, zva, jpdyn_atf, kt )
	375	ENDIF
	376	!
[13284]	377	IF ( iom_use("utau") ) THEN
	378	IF ( ln_drgice_imp.OR.ln_isfcav ) THEN
	379	ALLOCATE(zutau(jpi,jpj))
	380	DO jj = 2, jpjm1
	381	DO ji = 2, jpim1
	382	jk = miku(ji,jj)
	383	zutau(ji,jj) = utau(ji,jj) &
	384	& + 0.5_wp * rau0 * (rCdU_top(ji+1,jj)+rCdU_top(ji,jj)) * ua(ji,jj,jk)
	385	END DO
	386	END DO
	387	CALL lbc_lnk( 'dynnxt' , zutau, 'U', -1.)
	388	CALL iom_put( "utau", zutau(:,:) )
	389	DEALLOCATE(zutau)
	390	ELSE
	391	CALL iom_put( "utau", utau(:,:) )
	392	ENDIF
	393	ENDIF
	394	!
	395	IF ( iom_use("vtau") ) THEN
	396	IF ( ln_drgice_imp.OR.ln_isfcav ) THEN
	397	ALLOCATE(zvtau(jpi,jpj))
	398	DO jj = 2, jpjm1
	399	DO ji = 2, jpim1
	400	jk = mikv(ji,jj)
	401	zvtau(ji,jj) = vtau(ji,jj) &
	402	& + 0.5_wp * rau0 * (rCdU_top(ji,jj+1)+rCdU_top(ji,jj)) * va(ji,jj,jk)
	403	END DO
	404	END DO
	405	CALL lbc_lnk( 'dynnxt' , zvtau, 'V', -1.)
	406	CALL iom_put( "vtau", zvtau(:,:) )
	407	DEALLOCATE(zvtau)
	408	ELSE
	409	CALL iom_put( "vtau", vtau(:,:) )
	410	ENDIF
	411	ENDIF
	412	!
[1438]	413	IF(ln_ctl) CALL prt_ctl( tab3d_1=un, clinfo1=' nxt - Un: ', mask1=umask, &
	414	& tab3d_2=vn, clinfo2=' Vn: ' , mask2=vmask )
[6140]	415	!
[9019]	416	IF( ln_dynspg_ts ) DEALLOCATE( zue, zve )
	417	IF( l_trddyn ) DEALLOCATE( zua, zva )
	418	IF( ln_timing ) CALL timing_stop('dyn_nxt')
[2715]	419	!
[3]	420	END SUBROUTINE dyn_nxt
	421
[15422]	422	SUBROUTINE dyn_limit_velocity (kt)
	423	! limits maximum values of un and vn by volume courant number
	424	INTEGER, INTENT( in ) :: kt ! ocean time-step index
	425	!
	426	INTEGER :: ji, jj, jk ! dummy loop indices
	427	REAL(wp) :: zzu,zplim,zmlim,isp,ism,zcn,ze3e1,zzcn,zcnn,idivp,idivm
	428
	429	! limit fluxes
	430	zcn =cn_ulimit !0.9 ! maximum velocity inverse courant number
	431	zcnn = cnn_ulimit !0.54 ! how much to reduce cn by in divergen flow
	432
	433	DO jk = 1, jpkm1
	434	DO jj = 2, jpjm1
	435	DO ji = fs_2, fs_jpim1 ! vect. opt.
	436	! U direction
	437	zzu = un(ji,jj,jk)
	438	ze3e1 = e3u_n(ji ,jj,jk) * e2u(ji ,jj)
	439	! ips is 1 if flow is positive othersize zero
	440	isp = 0.5 * (sign(1.0_wp,zzu) + 1.0_wp )
	441	ism = -0.5 * (sign(1.0_wp,zzu) - 1.0_wp )
	442	! idev is 1 if divergent flow otherwise zero
	443	idivp = -isp * 0.5 * (sign(1.0_wp, un(ji-1,jj,jk)) - 1.0_wp )
	444	idivm = ism * 0.5 * (sign(1.0_wp, un(ji+1,jj,jk)) + 1.0_wp )
	445	zzcn = (idivp+idivm)*(zcnn-1.0_wp)+1.0_wp
	446	zzcn = zzcn * zcn
	447	zplim = zzcn * (e3t_n(ji ,jj,jk) * e1t(ji ,jj) * e2t(ji ,jj)) / &
	448	(2.0rdt ze3e1)*umask(ji,jj,jk)
	449	zmlim = -zzcn * (e3t_n(ji+1,jj,jk) * e1t(ji+1,jj) * e2t(ji+1,jj)) / &
	450	(2.0rdt ze3e1)*umask(ji,jj,jk)
	451	! limit currents
	452	un(ji,jj,jk) = min ( zzu,zplim) * isp + max(zzu,zmlim) *ism
	453
	454	! V direction
	455	zzu = vn(ji,jj,jk)
	456	ze3e1 = e3v_n(ji ,jj,jk) * e1v(ji ,jj)
	457	isp = 0.5 * (sign(1.0_wp,zzu) + 1.0_wp )
	458	ism = -0.5 * (sign(1.0_wp,zzu) - 1.0_wp )
	459	! idev is 1 if divergent flow otherwise zero
	460	idivp = -isp * 0.5 * (sign(1.0_wp, vn(ji,jj-1,jk)) - 1.0_wp )
	461	idivm = ism * 0.5 * (sign(1.0_wp, vn(ji,jj+1,jk)) + 1.0_wp )
	462	zzcn = (idivp+idivm)*(zcnn-1.0_wp)+1.0_wp
	463	zzcn = zzcn * zcn
	464	zplim = zzcn * (e3t_n(ji,jj ,jk) * e1t(ji,jj ) * e2t(ji,jj )) / &
	465	(2.0rdt ze3e1)*vmask(ji,jj,jk)
	466	zmlim = -zzcn * (e3t_n(ji,jj+1,jk) * e1t(ji,jj+1) * e2t(ji,jj+1)) / &
	467	(2.0rdt ze3e1)*vmask(ji,jj,jk)
	468	! limit currents
	469	vn(ji,jj,jk) = min ( zzu,zplim) * isp + max(zzu,zmlim) *ism
	470	ENDDO
	471	ENDDO
	472	ENDDO
	473	CALL lbc_lnk_multi( 'dynnxt', un(:,:,:), 'U', -1., vn(:,:,:), 'V', -1. )
	474
	475	END SUBROUTINE dyn_limit_velocity
	476
[1502]	477	!!=========================================================================
[3]	478	END MODULE dynnxt

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source: NEMO/branches/UKMO/r14075_India_uncoupled/src/OCE/DYN/dynnxt.F90 @ 15422

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