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traadv_fct.F90 in branches/2016/dev_r7233_CMIP6_diags_trunk_version/NEMOGCM/NEMO/OPA_SRC/TRA – NEMO

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source: branches/2016/dev_r7233_CMIP6_diags_trunk_version/NEMOGCM/NEMO/OPA_SRC/TRA/traadv_fct.F90 @ 7236

Last change on this file since 7236 was 7236, checked in by timgraham, 7 years ago
All changes related to diaptr (basin heat transports and transport components)
Property svn:keywords set to `Id`
File size: 40.6 KB

Rev	Line
[5770]	1	MODULE traadv_fct
[3]	2	!!==============================================================================
[5770]	3	!! * MODULE traadv_fct *
	4	!! Ocean tracers: horizontal & vertical advective trend (2nd/4th order Flux Corrected Transport method)
[3]	5	!!==============================================================================
[5770]	6	!! History : 3.7 ! 2015-09 (L. Debreu, G. Madec) original code (inspired from traadv_tvd.F90)
[503]	7	!!----------------------------------------------------------------------
[3]	8
	9	!!----------------------------------------------------------------------
[5770]	10	!! tra_adv_fct : update the tracer trend with a 3D advective trends using a 2nd or 4th order FCT scheme
	11	!! tra_adv_fct_zts: update the tracer trend with a 3D advective trends using a 2nd order FCT scheme
	12	!! with sub-time-stepping in the vertical direction
	13	!! nonosc : compute monotonic tracer fluxes by a non-oscillatory algorithm
	14	!! interp_4th_cpt : 4th order compact scheme for the vertical component of the advection
[3]	15	!!----------------------------------------------------------------------
[3625]	16	USE oce ! ocean dynamics and active tracers
	17	USE dom_oce ! ocean space and time domain
[4990]	18	USE trc_oce ! share passive tracers/Ocean variables
	19	USE trd_oce ! trends: ocean variables
[3625]	20	USE trdtra ! tracers trends
[4990]	21	USE diaptr ! poleward transport diagnostics
	22	!
[5770]	23	USE in_out_manager ! I/O manager
[3625]	24	USE lib_mpp ! MPP library
	25	USE lbclnk ! ocean lateral boundary condition (or mpp link)
[5770]	26	USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined)
[3625]	27	USE wrk_nemo ! Memory Allocation
	28	USE timing ! Timing
[3]	29
	30	IMPLICIT NONE
	31	PRIVATE
	32
[5770]	33	PUBLIC tra_adv_fct ! routine called by traadv.F90
	34	PUBLIC tra_adv_fct_zts ! routine called by traadv.F90
	35	PUBLIC interp_4th_cpt ! routine called by traadv_cen.F90
[3]	36
[5770]	37	LOGICAL :: l_trd ! flag to compute trends
	38	REAL(wp) :: r1_6 = 1._wp / 6._wp ! =1/6
[2528]	39
[3]	40	!! * Substitutions
	41	# include "vectopt_loop_substitute.h90"
	42	!!----------------------------------------------------------------------
[5770]	43	!! NEMO/OPA 3.7 , NEMO Consortium (2014)
[1152]	44	!! $Id$
[2528]	45	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[3]	46	!!----------------------------------------------------------------------
	47	CONTAINS
	48
[5770]	49	SUBROUTINE tra_adv_fct( kt, kit000, cdtype, p2dt, pun, pvn, pwn, &
	50	& ptb, ptn, pta, kjpt, kn_fct_h, kn_fct_v )
[3]	51	!!----------------------------------------------------------------------
[5770]	52	!! * ROUTINE tra_adv_fct *
[3]	53	!!
[6140]	54	!! ** Purpose : Compute the now trend due to total advection of tracers
	55	!! and add it to the general trend of tracer equations
[3]	56	!!
[5770]	57	!! ** Method : - 2nd or 4th FCT scheme on the horizontal direction
	58	!! (choice through the value of kn_fct)
[6140]	59	!! - on the vertical the 4th order is a compact scheme
[5770]	60	!! - corrected flux (monotonic correction)
[3]	61	!!
[6140]	62	!! ** Action : - update pta with the now advective tracer trends
	63	!! - send trends to trdtra module for further diagnostcs (l_trdtra=T)
	64	!! - htr_adv, str_adv : poleward advective heat and salt transport (ln_diaptr=T)
[503]	65	!!----------------------------------------------------------------------
[2528]	66	INTEGER , INTENT(in ) :: kt ! ocean time-step index
[3294]	67	INTEGER , INTENT(in ) :: kit000 ! first time step index
[2528]	68	CHARACTER(len=3) , INTENT(in ) :: cdtype ! =TRA or TRC (tracer indicator)
	69	INTEGER , INTENT(in ) :: kjpt ! number of tracers
[5770]	70	INTEGER , INTENT(in ) :: kn_fct_h ! order of the FCT scheme (=2 or 4)
	71	INTEGER , INTENT(in ) :: kn_fct_v ! order of the FCT scheme (=2 or 4)
[6140]	72	REAL(wp) , INTENT(in ) :: p2dt ! tracer time-step
[2528]	73	REAL(wp), DIMENSION(jpi,jpj,jpk ), INTENT(in ) :: pun, pvn, pwn ! 3 ocean velocity components
	74	REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT(in ) :: ptb, ptn ! before and now tracer fields
	75	REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT(inout) :: pta ! tracer trend
[2715]	76	!
[5770]	77	INTEGER :: ji, jj, jk, jn ! dummy loop indices
[6140]	78	REAL(wp) :: ztra ! local scalar
[5770]	79	REAL(wp) :: zfp_ui, zfp_vj, zfp_wk, zC2t_u, zC4t_u ! - -
	80	REAL(wp) :: zfm_ui, zfm_vj, zfm_wk, zC2t_v, zC4t_v ! - -
	81	REAL(wp), POINTER, DIMENSION(:,:,:) :: zwi, zwx, zwy, zwz, ztu, ztv, zltu, zltv, ztw
[7236]	82	REAL(wp), POINTER, DIMENSION(:,:,:) :: ztrdx, ztrdy, ztrd, zptry
[3]	83	!!----------------------------------------------------------------------
[3294]	84	!
[5770]	85	IF( nn_timing == 1 ) CALL timing_start('tra_adv_fct')
[3294]	86	!
[5770]	87	CALL wrk_alloc( jpi,jpj,jpk, zwi, zwx, zwy, zwz, ztu, ztv, zltu, zltv, ztw )
[3294]	88	!
	89	IF( kt == kit000 ) THEN
[2528]	90	IF(lwp) WRITE(numout,*)
[5770]	91	IF(lwp) WRITE(numout,*) 'tra_adv_fct : FCT advection scheme on ', cdtype
[2528]	92	IF(lwp) WRITE(numout,*) '~~~~~~~~~~~'
[3]	93	ENDIF
[2528]	94	!
[5770]	95	l_trd = .FALSE.
	96	IF( ( cdtype == 'TRA' .AND. l_trdtra ) .OR. ( cdtype == 'TRC' .AND. l_trdtrc ) ) l_trd = .TRUE.
	97	!
[2528]	98	IF( l_trd ) THEN
[3294]	99	CALL wrk_alloc( jpi, jpj, jpk, ztrdx, ztrdy, ztrdz )
[5770]	100	ztrdx(:,:,:) = 0._wp ; ztrdy(:,:,:) = 0._wp ; ztrdz(:,:,:) = 0._wp
[3294]	101	ENDIF
[2528]	102	!
[7236]	103	IF( cdtype == 'TRA' .AND. ln_diaptr ) THEN
	104	CALL wrk_alloc( jpi, jpj, jpk, zptry )
	105	zptry(:,:,:) = 0._wp
	106	ENDIF
[6140]	107	! ! surface & bottom value : flux set to zero one for all
	108	zwz(:,:, 1 ) = 0._wp
[5770]	109	zwx(:,:,jpk) = 0._wp ; zwy(:,:,jpk) = 0._wp ; zwz(:,:,jpk) = 0._wp
[2528]	110	!
[5770]	111	zwi(:,:,:) = 0._wp
[6140]	112	!
	113	DO jn = 1, kjpt !== loop over the tracers ==!
[5770]	114	!
	115	! !== upstream advection with initial mass fluxes & intermediate update ==!
	116	! !* upstream tracer flux in the i and j direction
[2528]	117	DO jk = 1, jpkm1
	118	DO jj = 1, jpjm1
	119	DO ji = 1, fs_jpim1 ! vector opt.
	120	! upstream scheme
	121	zfp_ui = pun(ji,jj,jk) + ABS( pun(ji,jj,jk) )
	122	zfm_ui = pun(ji,jj,jk) - ABS( pun(ji,jj,jk) )
	123	zfp_vj = pvn(ji,jj,jk) + ABS( pvn(ji,jj,jk) )
	124	zfm_vj = pvn(ji,jj,jk) - ABS( pvn(ji,jj,jk) )
	125	zwx(ji,jj,jk) = 0.5 * ( zfp_ui * ptb(ji,jj,jk,jn) + zfm_ui * ptb(ji+1,jj ,jk,jn) )
	126	zwy(ji,jj,jk) = 0.5 * ( zfp_vj * ptb(ji,jj,jk,jn) + zfm_vj * ptb(ji ,jj+1,jk,jn) )
	127	END DO
[3]	128	END DO
	129	END DO
[5770]	130	! !* upstream tracer flux in the k direction *!
[6140]	131	DO jk = 2, jpkm1 ! Interior value ( multiplied by wmask)
[4990]	132	DO jj = 1, jpj
	133	DO ji = 1, jpi
[2528]	134	zfp_wk = pwn(ji,jj,jk) + ABS( pwn(ji,jj,jk) )
	135	zfm_wk = pwn(ji,jj,jk) - ABS( pwn(ji,jj,jk) )
[5120]	136	zwz(ji,jj,jk) = 0.5 * ( zfp_wk * ptb(ji,jj,jk,jn) + zfm_wk * ptb(ji,jj,jk-1,jn) ) * wmask(ji,jj,jk)
[2528]	137	END DO
[3]	138	END DO
	139	END DO
[6140]	140	IF( ln_linssh ) THEN ! top ocean value (only in linear free surface as zwz has been w-masked)
[5770]	141	IF( ln_isfcav ) THEN ! top of the ice-shelf cavities and at the ocean surface
[5120]	142	DO jj = 1, jpj
	143	DO ji = 1, jpi
	144	zwz(ji,jj, mikt(ji,jj) ) = pwn(ji,jj,mikt(ji,jj)) * ptb(ji,jj,mikt(ji,jj),jn) ! linear free surface
	145	END DO
	146	END DO
[5770]	147	ELSE ! no cavities: only at the ocean surface
	148	zwz(:,:,1) = pwn(:,:,1) * ptb(:,:,1,jn)
	149	ENDIF
[5120]	150	ENDIF
[5770]	151	!
	152	DO jk = 1, jpkm1 !* trend and after field with monotonic scheme
[216]	153	DO jj = 2, jpjm1
	154	DO ji = fs_2, fs_jpim1 ! vector opt.
[6691]	155	! ! total intermediate advective trends
[5770]	156	ztra = - ( zwx(ji,jj,jk) - zwx(ji-1,jj ,jk ) &
	157	& + zwy(ji,jj,jk) - zwy(ji ,jj-1,jk ) &
[6691]	158	& + zwz(ji,jj,jk) - zwz(ji ,jj ,jk+1) ) * r1_e1e2t(ji,jj)
	159	! ! update and guess with monotonic sheme
	160	pta(ji,jj,jk,jn) = pta(ji,jj,jk,jn) + ztra / e3t_n(ji,jj,jk) * tmask(ji,jj,jk)
	161	zwi(ji,jj,jk) = ( e3t_b(ji,jj,jk) * ptb(ji,jj,jk,jn) + p2dt * ztra ) / e3t_a(ji,jj,jk) * tmask(ji,jj,jk)
[216]	162	END DO
	163	END DO
	164	END DO
[5770]	165	CALL lbc_lnk( zwi, 'T', 1. ) ! Lateral boundary conditions on zwi (unchanged sign)
	166	!
	167	IF( l_trd ) THEN ! trend diagnostics (contribution of upstream fluxes)
[6691]	168	ztrdx(:,:,:) = zwx(:,:,:) ; ztrdy(:,:,:) = zwy(:,:,:) ; ztrdz(:,:,:) = zwz(:,:,:)
[2528]	169	END IF
[5770]	170	! ! "Poleward" heat and salt transports (contribution of upstream fluxes)
[7236]	171	IF( cdtype == 'TRA' .AND. ln_diaptr ) zptry(:,:,:) = zwy(:,:,:)
[5770]	172	!
	173	! !== anti-diffusive flux : high order minus low order ==!
	174	!
[6140]	175	SELECT CASE( kn_fct_h ) !* horizontal anti-diffusive fluxes
[5770]	176	!
[6140]	177	CASE( 2 ) !- 2nd order centered
[5770]	178	DO jk = 1, jpkm1
	179	DO jj = 1, jpjm1
	180	DO ji = 1, fs_jpim1 ! vector opt.
	181	zwx(ji,jj,jk) = 0.5_wp * pun(ji,jj,jk) * ( ptn(ji,jj,jk,jn) + ptn(ji+1,jj,jk,jn) ) - zwx(ji,jj,jk)
	182	zwy(ji,jj,jk) = 0.5_wp * pvn(ji,jj,jk) * ( ptn(ji,jj,jk,jn) + ptn(ji,jj+1,jk,jn) ) - zwy(ji,jj,jk)
	183	END DO
[503]	184	END DO
	185	END DO
[5770]	186	!
[6140]	187	CASE( 4 ) !- 4th order centered
	188	zltu(:,:,jpk) = 0._wp ! Bottom value : flux set to zero
[5770]	189	zltv(:,:,jpk) = 0._wp
[6140]	190	DO jk = 1, jpkm1 ! Laplacian
	191	DO jj = 1, jpjm1 ! 1st derivative (gradient)
[5770]	192	DO ji = 1, fs_jpim1 ! vector opt.
	193	ztu(ji,jj,jk) = ( ptn(ji+1,jj ,jk,jn) - ptn(ji,jj,jk,jn) ) * umask(ji,jj,jk)
	194	ztv(ji,jj,jk) = ( ptn(ji ,jj+1,jk,jn) - ptn(ji,jj,jk,jn) ) * vmask(ji,jj,jk)
	195	END DO
[503]	196	END DO
[6140]	197	DO jj = 2, jpjm1 ! 2nd derivative * 1/ 6
[5770]	198	DO ji = fs_2, fs_jpim1 ! vector opt.
	199	zltu(ji,jj,jk) = ( ztu(ji,jj,jk) + ztu(ji-1,jj,jk) ) * r1_6
	200	zltv(ji,jj,jk) = ( ztv(ji,jj,jk) + ztv(ji,jj-1,jk) ) * r1_6
	201	END DO
	202	END DO
[503]	203	END DO
[5770]	204	CALL lbc_lnk( zltu, 'T', 1. ) ; CALL lbc_lnk( zltv, 'T', 1. ) ! Lateral boundary cond. (unchanged sgn)
	205	!
[6140]	206	DO jk = 1, jpkm1 ! Horizontal advective fluxes
[5770]	207	DO jj = 1, jpjm1
	208	DO ji = 1, fs_jpim1 ! vector opt.
	209	zC2t_u = ptn(ji,jj,jk,jn) + ptn(ji+1,jj ,jk,jn) ! 2 x C2 interpolation of T at u- & v-points
	210	zC2t_v = ptn(ji,jj,jk,jn) + ptn(ji ,jj+1,jk,jn)
	211	! ! C4 minus upstream advective fluxes
	212	zwx(ji,jj,jk) = 0.5_wp * pun(ji,jj,jk) * ( zC2t_u + zltu(ji,jj,jk) - zltu(ji+1,jj,jk) ) - zwx(ji,jj,jk)
	213	zwy(ji,jj,jk) = 0.5_wp * pvn(ji,jj,jk) * ( zC2t_v + zltv(ji,jj,jk) - zltv(ji,jj+1,jk) ) - zwy(ji,jj,jk)
	214	END DO
[5120]	215	END DO
[5770]	216	END DO
	217	!
[6140]	218	CASE( 41 ) !- 4th order centered ==>> !!gm coding attempt need to be tested
	219	ztu(:,:,jpk) = 0._wp ! Bottom value : flux set to zero
[5770]	220	ztv(:,:,jpk) = 0._wp
[6140]	221	DO jk = 1, jpkm1 ! 1st derivative (gradient)
	222	DO jj = 1, jpjm1
[5770]	223	DO ji = 1, fs_jpim1 ! vector opt.
	224	ztu(ji,jj,jk) = ( ptn(ji+1,jj ,jk,jn) - ptn(ji,jj,jk,jn) ) * umask(ji,jj,jk)
	225	ztv(ji,jj,jk) = ( ptn(ji ,jj+1,jk,jn) - ptn(ji,jj,jk,jn) ) * vmask(ji,jj,jk)
	226	END DO
	227	END DO
[5120]	228	END DO
[5770]	229	CALL lbc_lnk( ztu, 'U', -1. ) ; CALL lbc_lnk( ztv, 'V', -1. ) ! Lateral boundary cond. (unchanged sgn)
	230	!
[6140]	231	DO jk = 1, jpkm1 ! Horizontal advective fluxes
[5770]	232	DO jj = 2, jpjm1
	233	DO ji = 2, fs_jpim1 ! vector opt.
	234	zC2t_u = ptn(ji,jj,jk,jn) + ptn(ji+1,jj ,jk,jn) ! 2 x C2 interpolation of T at u- & v-points (x2)
	235	zC2t_v = ptn(ji,jj,jk,jn) + ptn(ji ,jj+1,jk,jn)
	236	! ! C4 interpolation of T at u- & v-points (x2)
	237	zC4t_u = zC2t_u + r1_6 * ( ztu(ji-1,jj ,jk) - ztu(ji+1,jj ,jk) )
	238	zC4t_v = zC2t_v + r1_6 * ( ztv(ji ,jj-1,jk) - ztv(ji ,jj+1,jk) )
	239	! ! C4 minus upstream advective fluxes
	240	zwx(ji,jj,jk) = 0.5_wp * pun(ji,jj,jk) * zC4t_u - zwx(ji,jj,jk)
	241	zwy(ji,jj,jk) = 0.5_wp * pvn(ji,jj,jk) * zC4t_v - zwy(ji,jj,jk)
	242	END DO
	243	END DO
	244	END DO
	245	!
	246	END SELECT
[6140]	247	!
	248	SELECT CASE( kn_fct_v ) !* vertical anti-diffusive fluxes (w-masked interior values)
[5770]	249	!
[6140]	250	CASE( 2 ) !- 2nd order centered
[5770]	251	DO jk = 2, jpkm1
	252	DO jj = 2, jpjm1
	253	DO ji = fs_2, fs_jpim1
[6140]	254	zwz(ji,jj,jk) = ( pwn(ji,jj,jk) * 0.5_wp * ( ptn(ji,jj,jk,jn) + ptn(ji,jj,jk-1,jn) ) &
	255	& - zwz(ji,jj,jk) ) * wmask(ji,jj,jk)
[5770]	256	END DO
	257	END DO
	258	END DO
	259	!
[6140]	260	CASE( 4 ) !- 4th order COMPACT
	261	CALL interp_4th_cpt( ptn(:,:,:,jn) , ztw ) ! zwt = COMPACT interpolation of T at w-point
[5770]	262	DO jk = 2, jpkm1
	263	DO jj = 2, jpjm1
	264	DO ji = fs_2, fs_jpim1
	265	zwz(ji,jj,jk) = ( pwn(ji,jj,jk) * ztw(ji,jj,jk) - zwz(ji,jj,jk) ) * wmask(ji,jj,jk)
	266	END DO
	267	END DO
	268	END DO
	269	!
	270	END SELECT
[6140]	271	IF( ln_linssh ) THEN ! top ocean value: high order = upstream ==>> zwz=0
	272	zwz(:,:,1) = 0._wp ! only ocean surface as interior zwz values have been w-masked
	273	ENDIF
[5770]	274	!
[2528]	275	CALL lbc_lnk( zwx, 'U', -1. ) ; CALL lbc_lnk( zwy, 'V', -1. ) ! Lateral bondary conditions
	276	CALL lbc_lnk( zwz, 'W', 1. )
[6140]	277	!
[5770]	278	! !== monotonicity algorithm ==!
	279	!
[2528]	280	CALL nonosc( ptb(:,:,:,jn), zwx, zwy, zwz, zwi, p2dt )
[6140]	281	!
[5770]	282	! !== final trend with corrected fluxes ==!
	283	!
[216]	284	DO jk = 1, jpkm1
	285	DO jj = 2, jpjm1
[2528]	286	DO ji = fs_2, fs_jpim1 ! vector opt.
[5770]	287	pta(ji,jj,jk,jn) = pta(ji,jj,jk,jn) - ( zwx(ji,jj,jk) - zwx(ji-1,jj ,jk ) &
	288	& + zwy(ji,jj,jk) - zwy(ji ,jj-1,jk ) &
	289	& + zwz(ji,jj,jk) - zwz(ji ,jj ,jk+1) ) &
[6140]	290	& * r1_e1e2t(ji,jj) / e3t_n(ji,jj,jk)
[216]	291	END DO
	292	END DO
	293	END DO
[5770]	294	!
[6140]	295	IF( l_trd ) THEN ! trend diagnostics (contribution of upstream fluxes)
[2528]	296	ztrdx(:,:,:) = ztrdx(:,:,:) + zwx(:,:,:) ! <<< Add to previously computed
	297	ztrdy(:,:,:) = ztrdy(:,:,:) + zwy(:,:,:) ! <<< Add to previously computed
	298	ztrdz(:,:,:) = ztrdz(:,:,:) + zwz(:,:,:) ! <<< Add to previously computed
[5770]	299	!
	300	CALL trd_tra( kt, cdtype, jn, jptra_xad, ztrdx, pun, ptn(:,:,:,jn) )
	301	CALL trd_tra( kt, cdtype, jn, jptra_yad, ztrdy, pvn, ptn(:,:,:,jn) )
	302	CALL trd_tra( kt, cdtype, jn, jptra_zad, ztrdz, pwn, ptn(:,:,:,jn) )
	303	!
	304	CALL wrk_dealloc( jpi,jpj,jpk, ztrdx, ztrdy, ztrdz )
[2528]	305	END IF
[6140]	306	! ! "Poleward" heat and salt transports (contribution of upstream fluxes)
[5147]	307	IF( cdtype == 'TRA' .AND. ln_diaptr ) THEN
[7236]	308	zptry(:,:,:) = zptry(:,:,:) + zwy(:,:,:) ! <<< Add to previously computed
	309	CALL dia_ptr_ohst_components( jn, 'adv', zptry(:,:,:) )
[2528]	310	ENDIF
[503]	311	!
[6140]	312	END DO ! end of tracer loop
[503]	313	!
[5770]	314	CALL wrk_dealloc( jpi,jpj,jpk, zwi, zwx, zwy, zwz, ztu, ztv, zltu, zltv, ztw )
[7236]	315	IF( cdtype == 'TRA' .AND. ln_diaptr ) CALL wrk_dealloc( jpi, jpj, jpk, zptry )
[2528]	316	!
[5770]	317	IF( nn_timing == 1 ) CALL timing_stop('tra_adv_fct')
[2715]	318	!
[5770]	319	END SUBROUTINE tra_adv_fct
[3]	320
[5737]	321
[5770]	322	SUBROUTINE tra_adv_fct_zts( kt, kit000, cdtype, p2dt, pun, pvn, pwn, &
	323	& ptb, ptn, pta, kjpt, kn_fct_zts )
[4990]	324	!!----------------------------------------------------------------------
[5770]	325	!! * ROUTINE tra_adv_fct_zts *
[4990]	326	!!
	327	!! ** Purpose : Compute the now trend due to total advection of
	328	!! tracers and add it to the general trend of tracer equations
	329	!!
	330	!! ** Method : TVD ZTS scheme, i.e. 2nd order centered scheme with
	331	!! corrected flux (monotonic correction). This version use sub-
	332	!! timestepping for the vertical advection which increases stability
	333	!! when vertical metrics are small.
	334	!! note: - this advection scheme needs a leap-frog time scheme
	335	!!
	336	!! ** Action : - update (pta) with the now advective tracer trends
	337	!! - save the trends
	338	!!----------------------------------------------------------------------
	339	INTEGER , INTENT(in ) :: kt ! ocean time-step index
	340	INTEGER , INTENT(in ) :: kit000 ! first time step index
	341	CHARACTER(len=3) , INTENT(in ) :: cdtype ! =TRA or TRC (tracer indicator)
	342	INTEGER , INTENT(in ) :: kjpt ! number of tracers
[5770]	343	INTEGER , INTENT(in ) :: kn_fct_zts ! number of number of vertical sub-timesteps
[6140]	344	REAL(wp) , INTENT(in ) :: p2dt ! tracer time-step
[4990]	345	REAL(wp), DIMENSION(jpi,jpj,jpk ), INTENT(in ) :: pun, pvn, pwn ! 3 ocean velocity components
	346	REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT(in ) :: ptb, ptn ! before and now tracer fields
	347	REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT(inout) :: pta ! tracer trend
	348	!
	349	REAL(wp), DIMENSION( jpk ) :: zts ! length of sub-timestep for vertical advection
[6140]	350	REAL(wp) :: zr_p2dt ! reciprocal of tracer timestep
[4990]	351	INTEGER :: ji, jj, jk, jl, jn ! dummy loop indices
	352	INTEGER :: jtb, jtn, jta ! sub timestep pointers for leap-frog/euler forward steps
	353	INTEGER :: jtaken ! toggle for collecting appropriate fluxes from sub timesteps
	354	REAL(wp) :: z_rzts ! Fractional length of Euler forward sub-timestep for vertical advection
[6140]	355	REAL(wp) :: ztra ! local scalar
[4990]	356	REAL(wp) :: zfp_ui, zfp_vj, zfp_wk ! - -
	357	REAL(wp) :: zfm_ui, zfm_vj, zfm_wk ! - -
[5770]	358	REAL(wp), POINTER, DIMENSION(:,: ) :: zwx_sav , zwy_sav
	359	REAL(wp), POINTER, DIMENSION(:,:,:) :: zwi, zwx, zwy, zwz, zhdiv, zwzts, zwz_sav
	360	REAL(wp), POINTER, DIMENSION(:,:,:) :: ztrdx, ztrdy, ztrdz
[7236]	361	REAL(wp), POINTER, DIMENSION(:,:,:) :: zptry
[5770]	362	REAL(wp), POINTER, DIMENSION(:,:,:,:) :: ztrs
[4990]	363	!!----------------------------------------------------------------------
	364	!
[5770]	365	IF( nn_timing == 1 ) CALL timing_start('tra_adv_fct_zts')
[4990]	366	!
[5770]	367	CALL wrk_alloc( jpi,jpj, zwx_sav, zwy_sav )
[6691]	368	CALL wrk_alloc( jpi,jpj,jpk, zwx, zwy, zwz, zwi, zhdiv, zwzts, zwz_sav )
[5770]	369	CALL wrk_alloc( jpi,jpj,jpk,kjpt+1, ztrs )
[4990]	370	!
	371	IF( kt == kit000 ) THEN
	372	IF(lwp) WRITE(numout,*)
[5770]	373	IF(lwp) WRITE(numout,*) 'tra_adv_fct_zts : 2nd order FCT scheme with ', kn_fct_zts, ' vertical sub-timestep on ', cdtype
[4990]	374	IF(lwp) WRITE(numout,*) '~~~~~~~~~~~'
	375	ENDIF
	376	!
	377	l_trd = .FALSE.
[5770]	378	IF( ( cdtype == 'TRA' .AND. l_trdtra ) .OR. ( cdtype == 'TRC' .AND. l_trdtrc ) ) l_trd = .TRUE.
[4990]	379	!
	380	IF( l_trd ) THEN
[5770]	381	CALL wrk_alloc( jpi,jpj,jpk, ztrdx, ztrdy, ztrdz )
[4990]	382	ztrdx(:,:,:) = 0._wp ; ztrdy(:,:,:) = 0._wp ; ztrdz(:,:,:) = 0._wp
	383	ENDIF
	384	!
[7236]	385	IF( cdtype == 'TRA' .AND. ln_diaptr ) THEN
	386	CALL wrk_alloc( jpi, jpj,jpk, zptry )
	387	zptry(:,:,:) = 0._wp
	388	ENDIF
[4990]	389	zwi(:,:,:) = 0._wp
[5770]	390	z_rzts = 1._wp / REAL( kn_fct_zts, wp )
[6140]	391	zr_p2dt = 1._wp / p2dt
[4990]	392	!
[6140]	393	! surface & Bottom value : flux set to zero for all tracers
	394	zwz(:,:, 1 ) = 0._wp
	395	zwx(:,:,jpk) = 0._wp ; zwz(:,:,jpk) = 0._wp
	396	zwy(:,:,jpk) = 0._wp ; zwi(:,:,jpk) = 0._wp
	397	!
[4990]	398	! ! ===========
	399	DO jn = 1, kjpt ! tracer loop
	400	! ! ===========
[6140]	401	!
	402	! Upstream advection with initial mass fluxes & intermediate update
	403	DO jk = 1, jpkm1 ! upstream tracer flux in the i and j direction
[4990]	404	DO jj = 1, jpjm1
	405	DO ji = 1, fs_jpim1 ! vector opt.
	406	! upstream scheme
	407	zfp_ui = pun(ji,jj,jk) + ABS( pun(ji,jj,jk) )
	408	zfm_ui = pun(ji,jj,jk) - ABS( pun(ji,jj,jk) )
	409	zfp_vj = pvn(ji,jj,jk) + ABS( pvn(ji,jj,jk) )
	410	zfm_vj = pvn(ji,jj,jk) - ABS( pvn(ji,jj,jk) )
	411	zwx(ji,jj,jk) = 0.5_wp * ( zfp_ui * ptb(ji,jj,jk,jn) + zfm_ui * ptb(ji+1,jj ,jk,jn) )
	412	zwy(ji,jj,jk) = 0.5_wp * ( zfp_vj * ptb(ji,jj,jk,jn) + zfm_vj * ptb(ji ,jj+1,jk,jn) )
	413	END DO
	414	END DO
	415	END DO
[6140]	416	! ! upstream tracer flux in the k direction
	417	DO jk = 2, jpkm1 ! Interior value
[4990]	418	DO jj = 1, jpj
	419	DO ji = 1, jpi
	420	zfp_wk = pwn(ji,jj,jk) + ABS( pwn(ji,jj,jk) )
	421	zfm_wk = pwn(ji,jj,jk) - ABS( pwn(ji,jj,jk) )
[5770]	422	zwz(ji,jj,jk) = 0.5_wp * ( zfp_wk * ptb(ji,jj,jk,jn) + zfm_wk * ptb(ji,jj,jk-1,jn) ) * wmask(ji,jj,jk)
[4990]	423	END DO
	424	END DO
	425	END DO
[6140]	426	IF( ln_linssh ) THEN ! top value : linear free surface case only (as zwz is multiplied by wmask)
	427	IF( ln_isfcav ) THEN ! ice-shelf cavities: top value
[5120]	428	DO jj = 1, jpj
	429	DO ji = 1, jpi
[5770]	430	zwz(ji,jj, mikt(ji,jj) ) = pwn(ji,jj,mikt(ji,jj)) * ptb(ji,jj,mikt(ji,jj),jn)
[5120]	431	END DO
[5770]	432	END DO
[6140]	433	ELSE ! no cavities, surface value
[5770]	434	zwz(:,:,1) = pwn(:,:,1) * ptb(:,:,1,jn)
	435	ENDIF
[5120]	436	ENDIF
[5770]	437	!
	438	DO jk = 1, jpkm1 ! total advective trend
[4990]	439	DO jj = 2, jpjm1
	440	DO ji = fs_2, fs_jpim1 ! vector opt.
[6140]	441	! ! total intermediate advective trends
[5770]	442	ztra = - ( zwx(ji,jj,jk) - zwx(ji-1,jj ,jk ) &
	443	& + zwy(ji,jj,jk) - zwy(ji ,jj-1,jk ) &
[6691]	444	& + zwz(ji,jj,jk) - zwz(ji ,jj ,jk+1) ) * r1_e1e2t(ji,jj)
[6140]	445	! ! update and guess with monotonic sheme
[6691]	446	pta(ji,jj,jk,jn) = pta(ji,jj,jk,jn) + ztra / e3t_n(ji,jj,jk) * tmask(ji,jj,jk)
	447	zwi(ji,jj,jk) = ( e3t_b(ji,jj,jk) * ptb(ji,jj,jk,jn) + p2dt * ztra ) / e3t_a(ji,jj,jk) * tmask(ji,jj,jk)
[4990]	448	END DO
	449	END DO
	450	END DO
[5770]	451	!
	452	CALL lbc_lnk( zwi, 'T', 1. ) ! Lateral boundary conditions on zwi (unchanged sign)
	453	!
	454	IF( l_trd ) THEN ! trend diagnostics (contribution of upstream fluxes)
[4990]	455	ztrdx(:,:,:) = zwx(:,:,:) ; ztrdy(:,:,:) = zwy(:,:,:) ; ztrdz(:,:,:) = zwz(:,:,:)
	456	END IF
[5770]	457	! ! "Poleward" heat and salt transports (contribution of upstream fluxes)
[7236]	458	IF( cdtype == 'TRA' .AND. ln_diaptr ) zptry(:,:,:) = zwy(:,:,:)
[4990]	459
[5770]	460	! 3. anti-diffusive flux : high order minus low order
	461	! ---------------------------------------------------
[4990]	462
[5770]	463	DO jk = 1, jpkm1 !* horizontal anti-diffusive fluxes
	464	!
[4990]	465	DO jj = 1, jpjm1
	466	DO ji = 1, fs_jpim1 ! vector opt.
	467	zwx_sav(ji,jj) = zwx(ji,jj,jk)
	468	zwy_sav(ji,jj) = zwy(ji,jj,jk)
[5770]	469	!
[4990]	470	zwx(ji,jj,jk) = 0.5_wp * pun(ji,jj,jk) * ( ptn(ji,jj,jk,jn) + ptn(ji+1,jj,jk,jn) )
	471	zwy(ji,jj,jk) = 0.5_wp * pvn(ji,jj,jk) * ( ptn(ji,jj,jk,jn) + ptn(ji,jj+1,jk,jn) )
	472	END DO
	473	END DO
[5770]	474	!
	475	DO jj = 2, jpjm1 ! partial horizontal divergence
[4990]	476	DO ji = fs_2, fs_jpim1
	477	zhdiv(ji,jj,jk) = ( zwx(ji,jj,jk) - zwx(ji-1,jj ,jk) &
	478	& + zwy(ji,jj,jk) - zwy(ji ,jj-1,jk) )
	479	END DO
	480	END DO
[5770]	481	!
[4990]	482	DO jj = 1, jpjm1
	483	DO ji = 1, fs_jpim1 ! vector opt.
[5770]	484	zwx(ji,jj,jk) = zwx(ji,jj,jk) - zwx_sav(ji,jj)
	485	zwy(ji,jj,jk) = zwy(ji,jj,jk) - zwy_sav(ji,jj)
[4990]	486	END DO
	487	END DO
	488	END DO
[6140]	489	!
[5770]	490	! !* vertical anti-diffusive flux
	491	zwz_sav(:,:,:) = zwz(:,:,:)
	492	ztrs (:,:,:,1) = ptb(:,:,:,jn)
[6771]	493	ztrs (:,:,1,2) = ptb(:,:,1,jn)
	494	ztrs (:,:,1,3) = ptb(:,:,1,jn)
[5770]	495	zwzts (:,:,:) = 0._wp
[4990]	496	!
[5770]	497	DO jl = 1, kn_fct_zts ! Start of sub timestepping loop
	498	!
	499	IF( jl == 1 ) THEN ! Euler forward to kick things off
	500	jtb = 1 ; jtn = 1 ; jta = 2
[6140]	501	zts(:) = p2dt * z_rzts
[5770]	502	jtaken = MOD( kn_fct_zts + 1 , 2) ! Toggle to collect every second flux
	503	! ! starting at jl =1 if kn_fct_zts is odd;
	504	! ! starting at jl =2 otherwise
	505	ELSEIF( jl == 2 ) THEN ! First leapfrog step
	506	jtb = 1 ; jtn = 2 ; jta = 3
[6140]	507	zts(:) = 2._wp * p2dt * z_rzts
[5770]	508	ELSE ! Shuffle pointers for subsequent leapfrog steps
	509	jtb = MOD(jtb,3) + 1
	510	jtn = MOD(jtn,3) + 1
	511	jta = MOD(jta,3) + 1
[4990]	512	ENDIF
[5770]	513	DO jk = 2, jpkm1 ! interior value
[4990]	514	DO jj = 2, jpjm1
	515	DO ji = fs_2, fs_jpim1
[5770]	516	zwz(ji,jj,jk) = 0.5_wp * pwn(ji,jj,jk) * ( ztrs(ji,jj,jk,jtn) + ztrs(ji,jj,jk-1,jtn) ) * wmask(ji,jj,jk)
	517	IF( jtaken == 0 ) zwzts(ji,jj,jk) = zwzts(ji,jj,jk) + zwz(ji,jj,jk) * zts(jk) ! Accumulate time-weighted vertcal flux
[4990]	518	END DO
	519	END DO
	520	END DO
[6140]	521	IF( ln_linssh ) THEN ! top value (only in linear free surface case)
[5770]	522	IF( ln_isfcav ) THEN ! ice-shelf cavities
	523	DO jj = 1, jpj
	524	DO ji = 1, jpi
	525	zwz(ji,jj, mikt(ji,jj) ) = pwn(ji,jj,mikt(ji,jj)) * ptb(ji,jj,mikt(ji,jj),jn) ! linear free surface
	526	END DO
	527	END DO
[6140]	528	ELSE ! no ocean cavities
[5770]	529	zwz(:,:,1) = pwn(:,:,1) * ptb(:,:,1,jn)
	530	ENDIF
	531	ENDIF
	532	!
[4990]	533	jtaken = MOD( jtaken + 1 , 2 )
[5770]	534	!
	535	DO jk = 2, jpkm1 ! total advective trends
[4990]	536	DO jj = 2, jpjm1
	537	DO ji = fs_2, fs_jpim1
[5770]	538	ztrs(ji,jj,jk,jta) = ztrs(ji,jj,jk,jtb) &
	539	& - zts(jk) * ( zhdiv(ji,jj,jk) + zwz(ji,jj,jk) - zwz(ji,jj,jk+1) ) &
[6140]	540	& * r1_e1e2t(ji,jj) / e3t_n(ji,jj,jk)
[4990]	541	END DO
	542	END DO
	543	END DO
[5770]	544	!
[4990]	545	END DO
	546
	547	DO jk = 2, jpkm1 ! Anti-diffusive vertical flux using average flux from the sub-timestepping
	548	DO jj = 2, jpjm1
	549	DO ji = fs_2, fs_jpim1
[6140]	550	zwz(ji,jj,jk) = ( zwzts(ji,jj,jk) * zr_p2dt - zwz_sav(ji,jj,jk) ) * wmask(ji,jj,jk)
[4990]	551	END DO
	552	END DO
	553	END DO
	554	CALL lbc_lnk( zwx, 'U', -1. ) ; CALL lbc_lnk( zwy, 'V', -1. ) ! Lateral bondary conditions
	555	CALL lbc_lnk( zwz, 'W', 1. )
	556
	557	! 4. monotonicity algorithm
	558	! -------------------------
	559	CALL nonosc( ptb(:,:,:,jn), zwx, zwy, zwz, zwi, p2dt )
	560
	561
	562	! 5. final trend with corrected fluxes
	563	! ------------------------------------
	564	DO jk = 1, jpkm1
	565	DO jj = 2, jpjm1
	566	DO ji = fs_2, fs_jpim1 ! vector opt.
[5770]	567	pta(ji,jj,jk,jn) = pta(ji,jj,jk,jn) + ( zwy(ji,jj,jk) - zwy(ji ,jj-1,jk ) &
	568	& + zwz(ji,jj,jk) - zwz(ji ,jj ,jk+1) ) &
[6140]	569	& * r1_e1e2t(ji,jj) / e3t_n(ji,jj,jk)
[4990]	570	END DO
	571	END DO
	572	END DO
	573
	574	! ! trend diagnostics (contribution of upstream fluxes)
	575	IF( l_trd ) THEN
	576	ztrdx(:,:,:) = ztrdx(:,:,:) + zwx(:,:,:) ! <<< Add to previously computed
	577	ztrdy(:,:,:) = ztrdy(:,:,:) + zwy(:,:,:) ! <<< Add to previously computed
	578	ztrdz(:,:,:) = ztrdz(:,:,:) + zwz(:,:,:) ! <<< Add to previously computed
[5770]	579	!
[4990]	580	CALL trd_tra( kt, cdtype, jn, jptra_xad, ztrdx, pun, ptn(:,:,:,jn) )
	581	CALL trd_tra( kt, cdtype, jn, jptra_yad, ztrdy, pvn, ptn(:,:,:,jn) )
	582	CALL trd_tra( kt, cdtype, jn, jptra_zad, ztrdz, pwn, ptn(:,:,:,jn) )
[5770]	583	!
	584	CALL wrk_dealloc( jpi,jpj,jpk, ztrdx, ztrdy, ztrdz )
[4990]	585	END IF
	586	! ! "Poleward" heat and salt transports (contribution of upstream fluxes)
[5147]	587	IF( cdtype == 'TRA' .AND. ln_diaptr ) THEN
[7236]	588	zptry(:,:,:) = zptry(:,:,:) + zwy(:,:,:)
	589	CALL dia_ptr_ohst_components( jn, 'adv', zptry(:,:,:) )
[4990]	590	ENDIF
	591	!
	592	END DO
	593	!
[5770]	594	CALL wrk_alloc( jpi,jpj, zwx_sav, zwy_sav )
	595	CALL wrk_alloc( jpi,jpj, jpk, zwx, zwy, zwz, zwi, zhdiv, zwzts, zwz_sav )
	596	CALL wrk_alloc( jpi,jpj,jpk,kjpt+1, ztrs )
[7236]	597	IF( cdtype == 'TRA' .AND. ln_diaptr ) CALL wrk_dealloc( jpi, jpj, jpk, zptry )
[4990]	598	!
[5770]	599	IF( nn_timing == 1 ) CALL timing_stop('tra_adv_fct_zts')
[4990]	600	!
[5770]	601	END SUBROUTINE tra_adv_fct_zts
[4990]	602
[5737]	603
[2528]	604	SUBROUTINE nonosc( pbef, paa, pbb, pcc, paft, p2dt )
[3]	605	!!---------------------------------------------------------------------
	606	!! * ROUTINE nonosc *
	607	!!
	608	!! ** Purpose : compute monotonic tracer fluxes from the upstream
	609	!! scheme and the before field by a nonoscillatory algorithm
	610	!!
	611	!! ** Method : ... ???
	612	!! warning : pbef and paft must be masked, but the boundaries
	613	!! conditions on the fluxes are not necessary zalezak (1979)
	614	!! drange (1995) multi-dimensional forward-in-time and upstream-
	615	!! in-space based differencing for fluid
	616	!!----------------------------------------------------------------------
[6140]	617	REAL(wp) , INTENT(in ) :: p2dt ! tracer time-step
[2528]	618	REAL(wp), DIMENSION (jpi,jpj,jpk), INTENT(in ) :: pbef, paft ! before & after field
	619	REAL(wp), DIMENSION (jpi,jpj,jpk), INTENT(inout) :: paa, pbb, pcc ! monotonic fluxes in the 3 directions
[2715]	620	!
[4990]	621	INTEGER :: ji, jj, jk ! dummy loop indices
	622	INTEGER :: ikm1 ! local integer
[6140]	623	REAL(wp) :: zpos, zneg, zbt, za, zb, zc, zbig, zrtrn ! local scalars
[2715]	624	REAL(wp) :: zau, zbu, zcu, zav, zbv, zcv, zup, zdo ! - -
[3294]	625	REAL(wp), POINTER, DIMENSION(:,:,:) :: zbetup, zbetdo, zbup, zbdo
[3]	626	!!----------------------------------------------------------------------
[3294]	627	!
	628	IF( nn_timing == 1 ) CALL timing_start('nonosc')
	629	!
	630	CALL wrk_alloc( jpi, jpj, jpk, zbetup, zbetdo, zbup, zbdo )
	631	!
[2715]	632	zbig = 1.e+40_wp
	633	zrtrn = 1.e-15_wp
[4990]	634	zbetup(:,:,:) = 0._wp ; zbetdo(:,:,:) = 0._wp
[785]	635
[3]	636	! Search local extrema
	637	! --------------------
[785]	638	! max/min of pbef & paft with large negative/positive value (-/+zbig) inside land
[4990]	639	zbup = MAX( pbef * tmask - zbig * ( 1._wp - tmask ), &
	640	& paft * tmask - zbig * ( 1._wp - tmask ) )
	641	zbdo = MIN( pbef * tmask + zbig * ( 1._wp - tmask ), &
	642	& paft * tmask + zbig * ( 1._wp - tmask ) )
[785]	643
[5120]	644	DO jk = 1, jpkm1
	645	ikm1 = MAX(jk-1,1)
	646	DO jj = 2, jpjm1
	647	DO ji = fs_2, fs_jpim1 ! vector opt.
	648
[785]	649	! search maximum in neighbourhood
	650	zup = MAX( zbup(ji ,jj ,jk ), &
	651	& zbup(ji-1,jj ,jk ), zbup(ji+1,jj ,jk ), &
	652	& zbup(ji ,jj-1,jk ), zbup(ji ,jj+1,jk ), &
	653	& zbup(ji ,jj ,ikm1), zbup(ji ,jj ,jk+1) )
[3]	654
[785]	655	! search minimum in neighbourhood
	656	zdo = MIN( zbdo(ji ,jj ,jk ), &
	657	& zbdo(ji-1,jj ,jk ), zbdo(ji+1,jj ,jk ), &
	658	& zbdo(ji ,jj-1,jk ), zbdo(ji ,jj+1,jk ), &
	659	& zbdo(ji ,jj ,ikm1), zbdo(ji ,jj ,jk+1) )
[3]	660
[785]	661	! positive part of the flux
[3]	662	zpos = MAX( 0., paa(ji-1,jj ,jk ) ) - MIN( 0., paa(ji ,jj ,jk ) ) &
	663	& + MAX( 0., pbb(ji ,jj-1,jk ) ) - MIN( 0., pbb(ji ,jj ,jk ) ) &
	664	& + MAX( 0., pcc(ji ,jj ,jk+1) ) - MIN( 0., pcc(ji ,jj ,jk ) )
[785]	665
	666	! negative part of the flux
[3]	667	zneg = MAX( 0., paa(ji ,jj ,jk ) ) - MIN( 0., paa(ji-1,jj ,jk ) ) &
	668	& + MAX( 0., pbb(ji ,jj ,jk ) ) - MIN( 0., pbb(ji ,jj-1,jk ) ) &
	669	& + MAX( 0., pcc(ji ,jj ,jk ) ) - MIN( 0., pcc(ji ,jj ,jk+1) )
[785]	670
[3]	671	! up & down beta terms
[6140]	672	zbt = e1e2t(ji,jj) * e3t_n(ji,jj,jk) / p2dt
[785]	673	zbetup(ji,jj,jk) = ( zup - paft(ji,jj,jk) ) / ( zpos + zrtrn ) * zbt
	674	zbetdo(ji,jj,jk) = ( paft(ji,jj,jk) - zdo ) / ( zneg + zrtrn ) * zbt
[3]	675	END DO
	676	END DO
	677	END DO
[2528]	678	CALL lbc_lnk( zbetup, 'T', 1. ) ; CALL lbc_lnk( zbetdo, 'T', 1. ) ! lateral boundary cond. (unchanged sign)
[3]	679
[237]	680	! 3. monotonic flux in the i & j direction (paa & pbb)
	681	! ----------------------------------------
[3]	682	DO jk = 1, jpkm1
	683	DO jj = 2, jpjm1
	684	DO ji = fs_2, fs_jpim1 ! vector opt.
[4990]	685	zau = MIN( 1._wp, zbetdo(ji,jj,jk), zbetup(ji+1,jj,jk) )
	686	zbu = MIN( 1._wp, zbetup(ji,jj,jk), zbetdo(ji+1,jj,jk) )
[785]	687	zcu = ( 0.5 + SIGN( 0.5 , paa(ji,jj,jk) ) )
[4990]	688	paa(ji,jj,jk) = paa(ji,jj,jk) * ( zcu * zau + ( 1._wp - zcu) * zbu )
[3]	689
[4990]	690	zav = MIN( 1._wp, zbetdo(ji,jj,jk), zbetup(ji,jj+1,jk) )
	691	zbv = MIN( 1._wp, zbetup(ji,jj,jk), zbetdo(ji,jj+1,jk) )
[785]	692	zcv = ( 0.5 + SIGN( 0.5 , pbb(ji,jj,jk) ) )
[4990]	693	pbb(ji,jj,jk) = pbb(ji,jj,jk) * ( zcv * zav + ( 1._wp - zcv) * zbv )
[3]	694
	695	! monotonic flux in the k direction, i.e. pcc
	696	! -------------------------------------------
[785]	697	za = MIN( 1., zbetdo(ji,jj,jk+1), zbetup(ji,jj,jk) )
	698	zb = MIN( 1., zbetup(ji,jj,jk+1), zbetdo(ji,jj,jk) )
	699	zc = ( 0.5 + SIGN( 0.5 , pcc(ji,jj,jk+1) ) )
[4990]	700	pcc(ji,jj,jk+1) = pcc(ji,jj,jk+1) * ( zc * za + ( 1._wp - zc) * zb )
[3]	701	END DO
	702	END DO
	703	END DO
[2528]	704	CALL lbc_lnk( paa, 'U', -1. ) ; CALL lbc_lnk( pbb, 'V', -1. ) ! lateral boundary condition (changed sign)
[503]	705	!
[3294]	706	CALL wrk_dealloc( jpi, jpj, jpk, zbetup, zbetdo, zbup, zbdo )
[2715]	707	!
[3294]	708	IF( nn_timing == 1 ) CALL timing_stop('nonosc')
	709	!
[3]	710	END SUBROUTINE nonosc
	711
[5770]	712
	713	SUBROUTINE interp_4th_cpt( pt_in, pt_out )
	714	!!----------------------------------------------------------------------
	715	!! * ROUTINE interp_4th_cpt *
	716	!!
	717	!! ** Purpose : Compute the interpolation of tracer at w-point
	718	!!
	719	!! ** Method : 4th order compact interpolation
	720	!!----------------------------------------------------------------------
	721	REAL(wp),DIMENSION(jpi,jpj,jpk), INTENT(in ) :: pt_in ! now tracer fields
	722	REAL(wp),DIMENSION(jpi,jpj,jpk), INTENT( out) :: pt_out ! now tracer field interpolated at w-pts
	723	!
	724	INTEGER :: ji, jj, jk ! dummy loop integers
	725	REAL(wp),DIMENSION(jpi,jpj,jpk) :: zwd, zwi, zws, zwrm, zwt
	726	!!----------------------------------------------------------------------
	727
	728	DO jk = 3, jpkm1 !== build the three diagonal matrix ==!
	729	DO jj = 1, jpj
	730	DO ji = 1, jpi
	731	zwd (ji,jj,jk) = 4._wp
	732	zwi (ji,jj,jk) = 1._wp
	733	zws (ji,jj,jk) = 1._wp
	734	zwrm(ji,jj,jk) = 3._wp * ( pt_in(ji,jj,jk-1) + pt_in(ji,jj,jk) )
	735	!
	736	IF( tmask(ji,jj,jk+1) == 0._wp) THEN ! Switch to second order centered at bottom
	737	zwd (ji,jj,jk) = 1._wp
	738	zwi (ji,jj,jk) = 0._wp
	739	zws (ji,jj,jk) = 0._wp
	740	zwrm(ji,jj,jk) = 0.5 * ( pt_in(ji,jj,jk-1) + pt_in(ji,jj,jk) )
	741	ENDIF
	742	END DO
	743	END DO
	744	END DO
	745	!
	746	jk=2 ! Switch to second order centered at top
	747	DO jj=1,jpj
	748	DO ji=1,jpi
	749	zwd (ji,jj,jk) = 1._wp
	750	zwi (ji,jj,jk) = 0._wp
	751	zws (ji,jj,jk) = 0._wp
	752	zwrm(ji,jj,jk) = 0.5 * ( pt_in(ji,jj,jk-1) + pt_in(ji,jj,jk) )
	753	END DO
	754	END DO
	755	!
	756	! !== tridiagonal solve ==!
	757	DO jj = 1, jpj ! first recurrence
	758	DO ji = 1, jpi
	759	zwt(ji,jj,2) = zwd(ji,jj,2)
	760	END DO
	761	END DO
	762	DO jk = 3, jpkm1
	763	DO jj = 1, jpj
	764	DO ji = 1, jpi
	765	zwt(ji,jj,jk) = zwd(ji,jj,jk) - zwi(ji,jj,jk) * zws(ji,jj,jk-1) /zwt(ji,jj,jk-1)
	766	END DO
	767	END DO
	768	END DO
	769	!
	770	DO jj = 1, jpj ! second recurrence: Zk = Yk - Ik / Tk-1 Zk-1
	771	DO ji = 1, jpi
	772	pt_out(ji,jj,2) = zwrm(ji,jj,2)
	773	END DO
	774	END DO
	775	DO jk = 3, jpkm1
	776	DO jj = 1, jpj
	777	DO ji = 1, jpi
	778	pt_out(ji,jj,jk) = zwrm(ji,jj,jk) - zwi(ji,jj,jk) / zwt(ji,jj,jk-1) *pt_out(ji,jj,jk-1)
	779	END DO
	780	END DO
	781	END DO
	782
	783	DO jj = 1, jpj ! third recurrence: Xk = (Zk - Sk Xk+1 ) / Tk
	784	DO ji = 1, jpi
	785	pt_out(ji,jj,jpkm1) = pt_out(ji,jj,jpkm1) / zwt(ji,jj,jpkm1)
	786	END DO
	787	END DO
	788	DO jk = jpk-2, 2, -1
	789	DO jj = 1, jpj
	790	DO ji = 1, jpi
	791	pt_out(ji,jj,jk) = ( pt_out(ji,jj,jk) - zws(ji,jj,jk) * pt_out(ji,jj,jk+1) ) / zwt(ji,jj,jk)
	792	END DO
	793	END DO
	794	END DO
	795	!
	796	END SUBROUTINE interp_4th_cpt
	797
[3]	798	!!======================================================================
[5770]	799	END MODULE traadv_fct

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