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traatf.F90 in NEMO/trunk/src/OCE/TRA – NEMO

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source: NEMO/trunk/src/OCE/TRA/traatf.F90 @ 12587

Last change on this file since 12587 was 12489, checked in by davestorkey, 4 years ago

Preparation for new timestepping scheme #2390.
Main changes:

Initial euler timestep now handled in stp and not in TRA/DYN routines.
Renaming of all timestep parameters. In summary, the namelist parameter is now rn_Dt and the current timestep is rDt (and rDt_ice, rDt_trc etc).
Renaming of a few miscellaneous parameters, eg. atfp -> rn_atfp (namelist parameter used everywhere) and rau0 -> rho0.

This version gives bit-comparable results to the previous version of the trunk.

Property svn:keywords set to Id

File size: 19.9 KB

Rev	Line
[11057]	1	MODULE traatf
[3]	2	!!======================================================================
[11057]	3	!! * MODULE traatf *
[11475]	4	!! Ocean active tracers: Asselin time filtering for temperature and salinity
[3]	5	!!======================================================================
[1110]	6	!! History : OPA ! 1991-11 (G. Madec) Original code
	7	!! 7.0 ! 1993-03 (M. Guyon) symetrical conditions
	8	!! 8.0 ! 1996-02 (G. Madec & M. Imbard) opa release 8.0
	9	!! - ! 1996-04 (A. Weaver) Euler forward step
	10	!! 8.2 ! 1999-02 (G. Madec, N. Grima) semi-implicit pressure grad.
	11	!! NEMO 1.0 ! 2002-08 (G. Madec) F90: Free form and module
	12	!! - ! 2002-11 (C. Talandier, A-M Treguier) Open boundaries
	13	!! - ! 2005-04 (C. Deltel) Add Asselin trend in the ML budget
	14	!! 2.0 ! 2006-02 (L. Debreu, C. Mazauric) Agrif implementation
	15	!! 3.0 ! 2008-06 (G. Madec) time stepping always done in trazdf
[1438]	16	!! 3.1 ! 2009-02 (G. Madec, R. Benshila) re-introduce the vvl option
[2528]	17	!! 3.3 ! 2010-04 (M. Leclair, G. Madec) semi-implicit hpg with asselin filter + modified LF-RA
	18	!! - ! 2010-05 (C. Ethe, G. Madec) merge TRC-TRA
[11475]	19	!! 4.1 ! 2019-08 (A. Coward, D. Storkey) rename tranxt.F90 -> traatf.F90. Now only does time filtering.
[3]	20	!!----------------------------------------------------------------------
[503]	21
	22	!!----------------------------------------------------------------------
[11475]	23	!! tra_atf : time filtering on tracers
	24	!! tra_atf_fix : time filtering on tracers : fixed volume case
	25	!! tra_atf_vvl : time filtering on tracers : variable volume case
[3]	26	!!----------------------------------------------------------------------
	27	USE oce ! ocean dynamics and tracers variables
	28	USE dom_oce ! ocean space and time domain variables
[2528]	29	USE sbc_oce ! surface boundary condition: ocean
[5467]	30	USE sbcrnf ! river runoffs
[12150]	31	USE isf_oce ! ice shelf melting
[4990]	32	USE zdf_oce ! ocean vertical mixing
[1438]	33	USE domvvl ! variable volume
[4990]	34	USE trd_oce ! trends: ocean variables
	35	USE trdtra ! trends manager: tracers
	36	USE traqsr ! penetrative solar radiation (needed for nksr)
	37	USE phycst ! physical constant
[9019]	38	USE ldftra ! lateral physics : tracers
	39	USE ldfslp ! lateral physics : slopes
	40	USE bdy_oce , ONLY : ln_bdy
[3294]	41	USE bdytra ! open boundary condition (bdy_tra routine)
[4990]	42	!
[3]	43	USE in_out_manager ! I/O manager
	44	USE lbclnk ! ocean lateral boundary conditions (or mpp link)
[258]	45	USE prtctl ! Print control
[4990]	46	USE timing ! Timing
[2528]	47	#if defined key_agrif
[9570]	48	USE agrif_oce_interp
[2528]	49	#endif
[3]	50
	51	IMPLICIT NONE
	52	PRIVATE
	53
[11057]	54	PUBLIC tra_atf ! routine called by step.F90
	55	PUBLIC tra_atf_fix ! to be used in trcnxt
	56	PUBLIC tra_atf_vvl ! to be used in trcnxt
[592]	57
	58	!! * Substitutions
[12340]	59	# include "do_loop_substitute.h90"
[3]	60	!!----------------------------------------------------------------------
[10068]	61	!! NEMO/OCE 4.0 , NEMO Consortium (2018)
[2715]	62	!! $Id$
[10068]	63	!! Software governed by the CeCILL license (see ./LICENSE)
[3]	64	!!----------------------------------------------------------------------
	65	CONTAINS
	66
[11057]	67	SUBROUTINE tra_atf( kt, Kbb, Kmm, Kaa, pts )
[3]	68	!!----------------------------------------------------------------------
[11057]	69	!! * ROUTINE traatf *
[3]	70	!!
[1110]	71	!! ** Purpose : Apply the boundary condition on the after temperature
[11475]	72	!! and salinity fields and add the Asselin time filter on now fields.
[3]	73	!!
[1110]	74	!! ** Method : At this stage of the computation, ta and sa are the
	75	!! after temperature and salinity as the time stepping has
	76	!! been performed in trazdf_imp or trazdf_exp module.
[3]	77	!!
[1110]	78	!! - Apply lateral boundary conditions on (ta,sa)
	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)
[1110]	82	!!
[1438]	83	!! - Update lateral boundary conditions on AGRIF children
	84	!! domains (lk_agrif=T)
[1110]	85	!!
[11475]	86	!! ** Action : - ts(Kmm) time filtered
[503]	87	!!----------------------------------------------------------------------
[11057]	88	INTEGER , INTENT(in ) :: kt ! ocean time-step index
	89	INTEGER , INTENT(in ) :: Kbb, Kmm, Kaa ! time level indices
	90	REAL(wp), DIMENSION(jpi,jpj,jpk,jpts,jpt), INTENT(inout) :: pts ! active tracers
[503]	91	!!
[6140]	92	INTEGER :: ji, jj, jk, jn ! dummy loop indices
	93	REAL(wp) :: zfact ! local scalars
[9019]	94	REAL(wp), ALLOCATABLE, DIMENSION(:,:,:) :: ztrdt, ztrds
[3]	95	!!----------------------------------------------------------------------
[3294]	96	!
[11057]	97	IF( ln_timing ) CALL timing_start( 'tra_atf')
[3294]	98	!
[1110]	99	IF( kt == nit000 ) THEN
	100	IF(lwp) WRITE(numout,*)
[11475]	101	IF(lwp) WRITE(numout,*) 'tra_atf : apply Asselin time filter to "now" fields'
[1110]	102	IF(lwp) WRITE(numout,*) '~~~~~~~'
[592]	103	ENDIF
	104
[1110]	105	! Update after tracer on domain lateral boundaries
	106	!
[5656]	107	#if defined key_agrif
	108	CALL Agrif_tra ! AGRIF zoom boundaries
	109	#endif
[9094]	110	! ! local domain boundaries (T-point, unchanged sign)
[11057]	111	CALL lbc_lnk_multi( 'traatf', pts(:,:,:,jp_tem,Kaa), 'T', 1., pts(:,:,:,jp_sal,Kaa), 'T', 1. )
[5656]	112	!
[11057]	113	IF( ln_bdy ) CALL bdy_tra( kt, Kbb, pts, Kaa ) ! BDY open boundaries
[1438]	114
[1110]	115	! trends computation initialisation
[7646]	116	IF( l_trdtra ) THEN
[9019]	117	ALLOCATE( ztrdt(jpi,jpj,jpk) , ztrds(jpi,jpj,jpk) )
[8698]	118	ztrdt(:,:,jpk) = 0._wp
	119	ztrds(:,:,jpk) = 0._wp
[4990]	120	IF( ln_traldf_iso ) THEN ! diagnose the "pure" Kz diffusive trend
[11057]	121	CALL trd_tra( kt, Kmm, Kaa, 'TRA', jp_tem, jptra_zdfp, ztrdt )
	122	CALL trd_tra( kt, Kmm, Kaa, 'TRA', jp_sal, jptra_zdfp, ztrds )
[4990]	123	ENDIF
[7646]	124	! total trend for the non-time-filtered variables.
[12489]	125	zfact = 1.0 / rn_Dt
[11057]	126	! G Nurser 23 Mar 2017. Recalculate trend as Delta(e3t*T)/e3tn; e3tn cancel from pts(Kmm) terms
[7646]	127	DO jk = 1, jpkm1
[11057]	128	ztrdt(:,:,jk) = ( pts(:,:,jk,jp_tem,Kaa)e3t(:,:,jk,Kaa) / e3t(:,:,jk,Kmm) - pts(:,:,jk,jp_tem,Kmm)) zfact
	129	ztrds(:,:,jk) = ( pts(:,:,jk,jp_sal,Kaa)e3t(:,:,jk,Kaa) / e3t(:,:,jk,Kmm) - pts(:,:,jk,jp_sal,Kmm)) zfact
[7646]	130	END DO
[11057]	131	CALL trd_tra( kt, Kmm, Kaa, 'TRA', jp_tem, jptra_tot, ztrdt )
	132	CALL trd_tra( kt, Kmm, Kaa, 'TRA', jp_sal, jptra_tot, ztrds )
[9019]	133	IF( ln_linssh ) THEN ! linear sea surface height only
[8698]	134	! Store now fields before applying the Asselin filter
	135	! in order to calculate Asselin filter trend later.
[11057]	136	ztrdt(:,:,:) = pts(:,:,:,jp_tem,Kmm)
	137	ztrds(:,:,:) = pts(:,:,:,jp_sal,Kmm)
[8698]	138	ENDIF
[1110]	139	ENDIF
	140
[12489]	141	IF( l_1st_euler ) THEN ! Euler time-stepping
[11099]	142	!
[9019]	143	IF (l_trdtra .AND. .NOT. ln_linssh ) THEN ! Zero Asselin filter contribution must be explicitly written out since for vvl
[11057]	144	! ! Asselin filter is output by tra_atf_vvl that is not called on this time step
[8698]	145	ztrdt(:,:,:) = 0._wp
	146	ztrds(:,:,:) = 0._wp
[11057]	147	CALL trd_tra( kt, Kmm, Kaa, 'TRA', jp_tem, jptra_atf, ztrdt )
	148	CALL trd_tra( kt, Kmm, Kaa, 'TRA', jp_sal, jptra_atf, ztrds )
[8698]	149	END IF
[6140]	150	!
[2528]	151	ELSE ! Leap-Frog + Asselin filter time stepping
	152	!
[12489]	153	IF( ln_linssh ) THEN ; CALL tra_atf_fix( kt, Kbb, Kmm, Kaa, nit000, 'TRA', pts, jpts ) ! linear free surface
	154	ELSE ; CALL tra_atf_vvl( kt, Kbb, Kmm, Kaa, nit000, rn_Dt, 'TRA', pts, sbc_tsc, sbc_tsc_b, jpts ) ! non-linear free surface
[2528]	155	ENDIF
[6140]	156	!
[11057]	157	CALL lbc_lnk_multi( 'traatf', pts(:,:,:,jp_tem,Kbb) , 'T', 1., pts(:,:,:,jp_sal,Kbb) , 'T', 1., &
	158	& pts(:,:,:,jp_tem,Kmm) , 'T', 1., pts(:,:,:,jp_sal,Kmm) , 'T', 1., &
	159	& pts(:,:,:,jp_tem,Kaa), 'T', 1., pts(:,:,:,jp_sal,Kaa), 'T', 1. )
[9094]	160	!
[5656]	161	ENDIF
[2715]	162	!
[8698]	163	IF( l_trdtra .AND. ln_linssh ) THEN ! trend of the Asselin filter (tb filtered - tb)/dt
[12489]	164	zfact = 1._wp / rDt
[1110]	165	DO jk = 1, jpkm1
[11099]	166	ztrdt(:,:,jk) = ( pts(:,:,jk,jp_tem,Kmm) - ztrdt(:,:,jk) ) * zfact
	167	ztrds(:,:,jk) = ( pts(:,:,jk,jp_sal,Kmm) - ztrds(:,:,jk) ) * zfact
[1110]	168	END DO
[11057]	169	CALL trd_tra( kt, Kmm, Kaa, 'TRA', jp_tem, jptra_atf, ztrdt )
	170	CALL trd_tra( kt, Kmm, Kaa, 'TRA', jp_sal, jptra_atf, ztrds )
[1438]	171	END IF
[9019]	172	IF( l_trdtra ) DEALLOCATE( ztrdt , ztrds )
[2715]	173	!
[1438]	174	! ! control print
[12236]	175	IF(sn_cfctl%l_prtctl) CALL prt_ctl( tab3d_1=pts(:,:,:,jp_tem,Kmm), clinfo1=' nxt - Tn: ', mask1=tmask, &
	176	& tab3d_2=pts(:,:,:,jp_sal,Kmm), clinfo2= ' Sn: ', mask2=tmask )
[1438]	177	!
[11057]	178	IF( ln_timing ) CALL timing_stop('tra_atf')
[3294]	179	!
[11057]	180	END SUBROUTINE tra_atf
[1438]	181
	182
[11099]	183	SUBROUTINE tra_atf_fix( kt, Kbb, Kmm, Kaa, kit000, cdtype, pt, kjpt )
[1438]	184	!!----------------------------------------------------------------------
[11057]	185	!! * ROUTINE tra_atf_fix *
[1438]	186	!!
[11475]	187	!! ** Purpose : fixed volume: apply the Asselin time filter to the "now" field
[1438]	188	!!
	189	!! ** Method : - Apply a Asselin time filter on now fields.
	190	!!
[11475]	191	!! ** Action : - pt(Kmm) ready for the next time step
[1438]	192	!!----------------------------------------------------------------------
[11057]	193	INTEGER , INTENT(in ) :: kt ! ocean time-step index
	194	INTEGER , INTENT(in ) :: Kbb, Kmm, Kaa ! time level indices
	195	INTEGER , INTENT(in ) :: kit000 ! first time step index
	196	CHARACTER(len=3) , INTENT(in ) :: cdtype ! =TRA or TRC (tracer indicator)
	197	INTEGER , INTENT(in ) :: kjpt ! number of tracers
	198	REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt,jpt), INTENT(inout) :: pt ! tracer fields
[2715]	199	!
[2528]	200	INTEGER :: ji, jj, jk, jn ! dummy loop indices
	201	REAL(wp) :: ztn, ztd ! local scalars
[1438]	202	!!----------------------------------------------------------------------
[6140]	203	!
[3294]	204	IF( kt == kit000 ) THEN
[1438]	205	IF(lwp) WRITE(numout,*)
[11475]	206	IF(lwp) WRITE(numout,*) 'tra_atf_fix : time filtering', cdtype
[1438]	207	IF(lwp) WRITE(numout,*) '~~~~~~~~~~~'
	208	ENDIF
	209	!
[2528]	210	DO jn = 1, kjpt
[1438]	211	!
[12340]	212	DO_3D_00_00( 1, jpkm1 )
	213	ztn = pt(ji,jj,jk,jn,Kmm)
	214	ztd = pt(ji,jj,jk,jn,Kaa) - 2._wp * ztn + pt(ji,jj,jk,jn,Kbb) ! time laplacian on tracers
	215	!
[12489]	216	pt(ji,jj,jk,jn,Kmm) = ztn + rn_atfp * ztd ! pt <-- filtered pt
[12340]	217	END_3D
[1110]	218	!
[2528]	219	END DO
[1438]	220	!
[11057]	221	END SUBROUTINE tra_atf_fix
[3]	222
[1110]	223
[11057]	224	SUBROUTINE tra_atf_vvl( kt, Kbb, Kmm, Kaa, kit000, p2dt, cdtype, pt, psbc_tc, psbc_tc_b, kjpt )
[1438]	225	!!----------------------------------------------------------------------
[11057]	226	!! * ROUTINE tra_atf_vvl *
[1438]	227	!!
	228	!! ** Purpose : Time varying volume: apply the Asselin time filter
	229	!!
	230	!! ** Method : - Apply a thickness weighted Asselin time filter on now fields.
[12489]	231	!! pt(Kmm) = ( e3t(Kmm)pt(Kmm) + rn_atfp[ e3t(Kbb)pt(Kbb) - 2 e3t(Kmm)pt(Kmm) + e3t_a*pt(Kaa) ] )
	232	!! /( e3t(Kmm) + rn_atfp*[ e3t(Kbb) - 2 e3t(Kmm) + e3t(Kaa) ] )
[1438]	233	!!
[11475]	234	!! ** Action : - pt(Kmm) ready for the next time step
[1438]	235	!!----------------------------------------------------------------------
[11057]	236	INTEGER , INTENT(in ) :: kt ! ocean time-step index
	237	INTEGER , INTENT(in ) :: Kbb, Kmm, Kaa ! time level indices
	238	INTEGER , INTENT(in ) :: kit000 ! first time step index
	239	REAL(wp) , INTENT(in ) :: p2dt ! time-step
	240	CHARACTER(len=3) , INTENT(in ) :: cdtype ! =TRA or TRC (tracer indicator)
	241	INTEGER , INTENT(in ) :: kjpt ! number of tracers
	242	REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt,jpt), INTENT(inout) :: pt ! tracer fields
	243	REAL(wp), DIMENSION(jpi,jpj ,kjpt) , INTENT(in ) :: psbc_tc ! surface tracer content
	244	REAL(wp), DIMENSION(jpi,jpj ,kjpt) , INTENT(in ) :: psbc_tc_b ! before surface tracer content
[6140]	245	!
[5930]	246	LOGICAL :: ll_traqsr, ll_rnf, ll_isf ! local logical
[2528]	247	INTEGER :: ji, jj, jk, jn ! dummy loop indices
[8698]	248	REAL(wp) :: zfact, zfact1, ztc_a , ztc_n , ztc_b , ztc_f , ztc_d ! local scalar
[12372]	249	REAL(wp) :: zfact2, ze3t_b, ze3t_n, ze3t_a, ze3t_f, ze3t_d, zscale ! - -
[9019]	250	REAL(wp), ALLOCATABLE, DIMENSION(:,:,:,:) :: ztrd_atf
[1438]	251	!!----------------------------------------------------------------------
[3294]	252	!
	253	IF( kt == kit000 ) THEN
[1438]	254	IF(lwp) WRITE(numout,*)
[11475]	255	IF(lwp) WRITE(numout,*) 'tra_atf_vvl : time filtering', cdtype
[1438]	256	IF(lwp) WRITE(numout,*) '~~~~~~~~~~~'
	257	ENDIF
[2528]	258	!
	259	IF( cdtype == 'TRA' ) THEN
	260	ll_traqsr = ln_traqsr ! active tracers case and solar penetration
[5467]	261	ll_rnf = ln_rnf ! active tracers case and river runoffs
[6140]	262	ll_isf = ln_isf ! active tracers case and ice shelf melting
	263	ELSE ! passive tracers case
	264	ll_traqsr = .FALSE. ! NO solar penetration
	265	ll_rnf = .FALSE. ! NO river runoffs ???? !!gm BUG ?
	266	ll_isf = .FALSE. ! NO ice shelf melting/freezing !!gm BUG ??
[2528]	267	ENDIF
	268	!
[9019]	269	IF( ( l_trdtra .AND. cdtype == 'TRA' ) .OR. ( l_trdtrc .AND. cdtype == 'TRC' ) ) THEN
	270	ALLOCATE( ztrd_atf(jpi,jpj,jpk,kjpt) )
[8698]	271	ztrd_atf(:,:,:,:) = 0.0_wp
	272	ENDIF
[10095]	273	zfact = 1._wp / p2dt
[12489]	274	zfact1 = rn_atfp * p2dt
	275	zfact2 = zfact1 * r1_rho0
[2528]	276	DO jn = 1, kjpt
[12340]	277	DO_3D_00_00( 1, jpkm1 )
	278	ze3t_b = e3t(ji,jj,jk,Kbb)
	279	ze3t_n = e3t(ji,jj,jk,Kmm)
	280	ze3t_a = e3t(ji,jj,jk,Kaa)
	281	! ! tracer content at Before, now and after
	282	ztc_b = pt(ji,jj,jk,jn,Kbb) * ze3t_b
	283	ztc_n = pt(ji,jj,jk,jn,Kmm) * ze3t_n
	284	ztc_a = pt(ji,jj,jk,jn,Kaa) * ze3t_a
	285	!
	286	ze3t_d = ze3t_a - 2. * ze3t_n + ze3t_b
	287	ztc_d = ztc_a - 2. * ztc_n + ztc_b
	288	!
[12489]	289	ze3t_f = ze3t_n + rn_atfp * ze3t_d
	290	ztc_f = ztc_n + rn_atfp * ztc_d
[12340]	291	!
[12372]	292	! Add asselin correction on scale factors:
	293	zscale = tmask(ji,jj,jk) * e3t(ji,jj,jk,Kmm) / ( ht(ji,jj) + 1._wp - ssmask(ji,jj) )
	294	ze3t_f = ze3t_f - zfact2 * zscale * ( emp_b(ji,jj) - emp(ji,jj) )
	295	IF ( ll_rnf ) ze3t_f = ze3t_f + zfact2 * zscale * ( rnf_b(ji,jj) - rnf(ji,jj) )
	296	IF ( ll_isf ) THEN
	297	IF ( ln_isfcav_mlt ) ze3t_f = ze3t_f - zfact2 * zscale * ( fwfisf_cav_b(ji,jj) - fwfisf_cav(ji,jj) )
	298	IF ( ln_isfpar_mlt ) ze3t_f = ze3t_f - zfact2 * zscale * ( fwfisf_par_b(ji,jj) - fwfisf_par(ji,jj) )
	299	ENDIF
	300	!
[12340]	301	IF( jk == mikt(ji,jj) ) THEN ! first level
	302	ztc_f = ztc_f - zfact1 * ( psbc_tc(ji,jj,jn) - psbc_tc_b(ji,jj,jn) )
	303	ENDIF
	304	!
	305	! solar penetration (temperature only)
	306	IF( ll_traqsr .AND. jn == jp_tem .AND. jk <= nksr ) &
	307	& ztc_f = ztc_f - zfact1 * ( qsr_hc(ji,jj,jk) - qsr_hc_b(ji,jj,jk) )
	308	!
	309	!
	310	IF( ll_rnf .AND. jk <= nk_rnf(ji,jj) ) &
	311	& ztc_f = ztc_f - zfact1 * ( rnf_tsc(ji,jj,jn) - rnf_tsc_b(ji,jj,jn) ) &
	312	& * e3t(ji,jj,jk,Kmm) / h_rnf(ji,jj)
[12156]	313
[12340]	314	!
	315	! ice shelf
	316	IF( ll_isf ) THEN
	317	!
	318	! melt in the cavity
	319	IF ( ln_isfcav_mlt ) THEN
	320	! level fully include in the Losch_2008 ice shelf boundary layer
	321	IF ( jk >= misfkt_cav(ji,jj) .AND. jk < misfkb_cav(ji,jj) ) THEN
	322	ztc_f = ztc_f - zfact1 * ( risf_cav_tsc(ji,jj,jn) - risf_cav_tsc_b(ji,jj,jn) ) &
	323	& * e3t(ji,jj,jk,Kmm) / rhisf_tbl_cav(ji,jj)
	324	END IF
	325	! level partially include in Losch_2008 ice shelf boundary layer
	326	IF ( jk == misfkb_cav(ji,jj) ) THEN
	327	ztc_f = ztc_f - zfact1 * ( risf_cav_tsc(ji,jj,jn) - risf_cav_tsc_b(ji,jj,jn) ) &
	328	& * e3t(ji,jj,jk,Kmm) / rhisf_tbl_cav(ji,jj) * rfrac_tbl_cav(ji,jj)
	329	END IF
	330	END IF
	331	!
	332	! parametrised melt (cavity closed)
	333	IF ( ln_isfpar_mlt ) THEN
	334	! level fully include in the Losch_2008 ice shelf boundary layer
	335	IF ( jk >= misfkt_par(ji,jj) .AND. jk < misfkb_par(ji,jj) ) THEN
	336	ztc_f = ztc_f - zfact1 * ( risf_par_tsc(ji,jj,jn) - risf_par_tsc_b(ji,jj,jn) ) &
	337	& * e3t(ji,jj,jk,Kmm) / rhisf_tbl_par(ji,jj)
	338	END IF
	339	! level partially include in Losch_2008 ice shelf boundary layer
	340	IF ( jk == misfkb_par(ji,jj) ) THEN
	341	ztc_f = ztc_f - zfact1 * ( risf_par_tsc(ji,jj,jn) - risf_par_tsc_b(ji,jj,jn) ) &
	342	& * e3t(ji,jj,jk,Kmm) / rhisf_tbl_par(ji,jj) * rfrac_tbl_par(ji,jj)
	343	END IF
	344	END IF
	345	!
	346	! ice sheet coupling correction
	347	IF ( ln_isfcpl ) THEN
[12156]	348	!
[12340]	349	! at kt = nit000, risfcpl_vol_n = 0 and risfcpl_vol_b = risfcpl_vol so contribution nul
	350	IF ( ln_rstart .AND. kt == nit000+1 ) THEN
	351	ztc_f = ztc_f + zfact1 * risfcpl_tsc(ji,jj,jk,jn) * r1_e1e2t(ji,jj)
[12372]	352	! Shouldn't volume increment be spread according thanks to zscale ?
[12340]	353	ze3t_f = ze3t_f - zfact1 * risfcpl_vol(ji,jj,jk ) * r1_e1e2t(ji,jj)
[5643]	354	END IF
[6140]	355	!
[12340]	356	END IF
	357	!
	358	END IF
	359	!
	360	ze3t_f = 1.e0 / ze3t_f
	361	pt(ji,jj,jk,jn,Kmm) = ztc_f * ze3t_f ! time filtered "now" field
	362	!
	363	IF( ( l_trdtra .and. cdtype == 'TRA' ) .OR. ( l_trdtrc .and. cdtype == 'TRC' ) ) THEN
	364	ztrd_atf(ji,jj,jk,jn) = (ztc_f - ztc_n) * zfact/ze3t_n
	365	ENDIF
	366	!
	367	END_3D
[2528]	368	!
	369	END DO
[503]	370	!
[9019]	371	IF( ( l_trdtra .AND. cdtype == 'TRA' ) .OR. ( l_trdtrc .AND. cdtype == 'TRC' ) ) THEN
	372	IF( l_trdtra .AND. cdtype == 'TRA' ) THEN
[11057]	373	CALL trd_tra( kt, Kmm, Kaa, cdtype, jp_tem, jptra_atf, ztrd_atf(:,:,:,jp_tem) )
	374	CALL trd_tra( kt, Kmm, Kaa, cdtype, jp_sal, jptra_atf, ztrd_atf(:,:,:,jp_sal) )
[9019]	375	ENDIF
	376	IF( l_trdtrc .AND. cdtype == 'TRC' ) THEN
	377	DO jn = 1, kjpt
[11057]	378	CALL trd_tra( kt, Kmm, Kaa, cdtype, jn, jptra_atf, ztrd_atf(:,:,:,jn) )
[9019]	379	END DO
	380	ENDIF
	381	DEALLOCATE( ztrd_atf )
[8698]	382	ENDIF
	383	!
[11057]	384	END SUBROUTINE tra_atf_vvl
[3]	385
	386	!!======================================================================
[11057]	387	END MODULE traatf

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