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traldf_triad.F90 in NEMO/branches/2020/r12377_ticket2386/src/OCE/TRA – NEMO

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source: NEMO/branches/2020/r12377_ticket2386/src/OCE/TRA/traldf_triad.F90 @ 12808

Last change on this file since 12808 was 12511, checked in by andmirek, 4 years ago
ticket #2386: update trunk@12493 to have AGRIF sette working
Property svn:keywords set to `Id`
File size: 21.1 KB

Rev	Line
[5758]	1	MODULE traldf_triad
[2371]	2	!!======================================================================
[5758]	3	!! * MODULE traldf_triad *
[2371]	4	!! Ocean tracers: horizontal component of the lateral tracer mixing trend
	5	!!======================================================================
[5758]	6	!! History : 3.3 ! 2010-10 (G. Nurser, C. Harris, G. Madec) Griffies operator (original code)
	7	!! 3.7 ! 2013-12 (F. Lemarie, G. Madec) triad operator (Griffies) + Method of Stabilizing Correction
[2205]	8	!!----------------------------------------------------------------------
[5758]	9
[2205]	10	!!----------------------------------------------------------------------
[5758]	11	!! tra_ldf_triad : update the tracer trend with the iso-neutral laplacian triad-operator
[2205]	12	!!----------------------------------------------------------------------
[6140]	13	USE oce ! ocean dynamics and active tracers
	14	USE dom_oce ! ocean space and time domain
	15	USE phycst ! physical constants
	16	USE trc_oce ! share passive tracers/Ocean variables
	17	USE zdf_oce ! ocean vertical physics
	18	USE ldftra ! lateral physics: eddy diffusivity
	19	USE ldfslp ! lateral physics: iso-neutral slopes
	20	USE traldf_iso ! lateral diffusion (Madec operator) (tra_ldf_iso routine)
	21	USE diaptr ! poleward transport diagnostics
[7646]	22	USE diaar5 ! AR5 diagnostics
[6140]	23	USE zpshde ! partial step: hor. derivative (zps_hde routine)
[5758]	24	!
[6140]	25	USE in_out_manager ! I/O manager
	26	USE iom ! I/O library
	27	USE lbclnk ! ocean lateral boundary conditions (or mpp link)
	28	USE lib_mpp ! MPP library
[2205]	29
	30	IMPLICIT NONE
	31	PRIVATE
	32
[5758]	33	PUBLIC tra_ldf_triad ! routine called by traldf.F90
[2205]	34
[5758]	35	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, SAVE :: zdkt3d !: vertical tracer gradient at 2 levels
[2371]	36
[7646]	37	LOGICAL :: l_ptr ! flag to compute poleward transport
	38	LOGICAL :: l_hst ! flag to compute heat transport
	39
	40
[2205]	41	!! * Substitutions
[12377]	42	# include "do_loop_substitute.h90"
[2205]	43	!!----------------------------------------------------------------------
[9598]	44	!! NEMO/OCE 4.0 , NEMO Consortium (2018)
[2287]	45	!! $Id$
[10068]	46	!! Software governed by the CeCILL license (see ./LICENSE)
[2205]	47	!!----------------------------------------------------------------------
	48	CONTAINS
	49
[12377]	50	SUBROUTINE tra_ldf_triad( kt, Kmm, kit000, cdtype, pahu, pahv, &
	51	& pgu , pgv , pgui, pgvi , &
	52	& pt , pt2, pt_rhs, kjpt, kpass )
[2450]	53	!!----------------------------------------------------------------------
[5758]	54	!! * ROUTINE tra_ldf_triad *
[2450]	55	!!
[3294]	56	!! ** Purpose : Compute the before horizontal tracer (t & s) diffusive
	57	!! trend for a laplacian tensor (ezxcept the dz[ dz[.] ] term) and
[2450]	58	!! add it to the general trend of tracer equation.
	59	!!
[3294]	60	!! ** Method : The horizontal component of the lateral diffusive trends
[2450]	61	!! is provided by a 2nd order operator rotated along neural or geopo-
	62	!! tential surfaces to which an eddy induced advection can be added
	63	!! It is computed using before fields (forward in time) and isopyc-
	64	!! nal or geopotential slopes computed in routine ldfslp.
	65	!!
[5758]	66	!! see documentation for the desciption
[2450]	67	!!
[12377]	68	!! ** Action : pt_rhs updated with the before rotated diffusion
[5758]	69	!! ah_wslp2 ....
	70	!! akz stabilizing vertical diffusivity coefficient (used in trazdf_imp)
[2450]	71	!!----------------------------------------------------------------------
	72	INTEGER , INTENT(in ) :: kt ! ocean time-step index
[3294]	73	INTEGER , INTENT(in ) :: kit000 ! first time step index
[2450]	74	CHARACTER(len=3) , INTENT(in ) :: cdtype ! =TRA or TRC (tracer indicator)
	75	INTEGER , INTENT(in ) :: kjpt ! number of tracers
[5758]	76	INTEGER , INTENT(in ) :: kpass ! =1/2 first or second passage
[12377]	77	INTEGER , INTENT(in) :: Kmm ! ocean time level indices
[5758]	78	REAL(wp), DIMENSION(jpi,jpj,jpk) , INTENT(in ) :: pahu, pahv ! eddy diffusivity at u- and v-points [m2/s]
[5777]	79	REAL(wp), DIMENSION(jpi,jpj ,kjpt), INTENT(in ) :: pgu , pgv ! tracer gradient at pstep levels
[5758]	80	REAL(wp), DIMENSION(jpi,jpj, kjpt), INTENT(in ) :: pgui, pgvi ! tracer gradient at top levels
[12377]	81	REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT(in ) :: pt ! tracer (kpass=1) or laplacian of tracer (kpass=2)
	82	REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT(in ) :: pt2 ! tracer (only used in kpass=2)
	83	REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT(inout) :: pt_rhs ! tracer trend
[2715]	84	!
[5758]	85	INTEGER :: ji, jj, jk, jn ! dummy loop indices
	86	INTEGER :: ip,jp,kp ! dummy loop indices
	87	INTEGER :: ierr ! local integer
[12511]	88	REAL(wp) :: zmsku, zabe1, zcof1, zcoef3 ! local scalars
	89	REAL(wp) :: zmskv, zabe2, zcof2, zcoef4 ! - -
	90	REAL(wp) :: zcoef0, ze3w_2, zsign ! - -
[2371]	91	!
[2454]	92	REAL(wp) :: zslope_skew, zslope_iso, zslope2, zbu, zbv
[5758]	93	REAL(wp) :: ze1ur, ze2vr, ze3wr, zdxt, zdyt, zdzt
[2454]	94	REAL(wp) :: zah, zah_slp, zaei_slp
[9019]	95	REAL(wp), DIMENSION(jpi,jpj ) :: z2d ! 2D workspace
	96	REAL(wp), DIMENSION(jpi,jpj,jpk) :: zdit, zdjt, zftu, zftv, ztfw, zpsi_uw, zpsi_vw ! 3D -
[2205]	97	!!----------------------------------------------------------------------
[3294]	98	!
[5758]	99	IF( .NOT.ALLOCATED(zdkt3d) ) THEN
	100	ALLOCATE( zdkt3d(jpi,jpj,0:1) , STAT=ierr )
[10425]	101	CALL mpp_sum ( 'traldf_triad', ierr )
[5758]	102	IF( ierr > 0 ) CALL ctl_stop('STOP', 'tra_ldf_triad: unable to allocate arrays')
[2450]	103	ENDIF
[5758]	104	!
	105	IF( kpass == 1 .AND. kt == kit000 ) THEN
	106	IF(lwp) WRITE(numout,*)
	107	IF(lwp) WRITE(numout,*) 'tra_ldf_triad : rotated laplacian diffusion operator on ', cdtype
	108	IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~~'
	109	ENDIF
[7646]	110	!
	111	l_hst = .FALSE.
	112	l_ptr = .FALSE.
[12511]	113	IF( cdtype == 'TRA' ) THEN
	114	IF( iom_use( 'sophtldf' ) .OR. iom_use( 'sopstldf') ) l_ptr = .TRUE.
	115	IF( iom_use("uadv_heattr") .OR. iom_use("vadv_heattr") .OR. &
	116	& iom_use("uadv_salttr") .OR. iom_use("vadv_salttr") ) l_hst = .TRUE.
[5758]	117	ENDIF
	118	!
	119	IF( kpass == 1 ) THEN ; zsign = 1._wp ! bilaplacian operator require a minus sign (eddy diffusivity >0)
	120	ELSE ; zsign = -1._wp
	121	ENDIF
[6140]	122	!
[2205]	123	!!----------------------------------------------------------------------
[5758]	124	!! 0 - calculate ah_wslp2, akz, and optionally zpsi_uw, zpsi_vw
[2371]	125	!!----------------------------------------------------------------------
[5758]	126	!
	127	IF( kpass == 1 ) THEN !== first pass only and whatever the tracer is ==!
	128	!
	129	akz (:,:,:) = 0._wp
	130	ah_wslp2(:,:,:) = 0._wp
	131	IF( ln_ldfeiv_dia ) THEN
	132	zpsi_uw(:,:,:) = 0._wp
	133	zpsi_vw(:,:,:) = 0._wp
	134	ENDIF
	135	!
	136	DO ip = 0, 1 ! i-k triads
	137	DO kp = 0, 1
[12377]	138	DO_3D_10_10( 1, jpkm1 )
	139	ze3wr = 1._wp / e3w(ji+ip,jj,jk+kp,Kmm)
	140	zbu = e1e2u(ji,jj) * e3u(ji,jj,jk,Kmm)
	141	zah = 0.25_wp * pahu(ji,jj,jk)
	142	zslope_skew = triadi_g(ji+ip,jj,jk,1-ip,kp)
	143	! Subtract s-coordinate slope at t-points to give slope rel to s-surfaces (do this by adding gradient of depth)
	144	zslope2 = zslope_skew + ( gdept(ji+1,jj,jk,Kmm) - gdept(ji,jj,jk,Kmm) ) * r1_e1u(ji,jj) * umask(ji,jj,jk+kp)
	145	zslope2 = zslope2 *zslope2
	146	ah_wslp2(ji+ip,jj,jk+kp) = ah_wslp2(ji+ip,jj,jk+kp) + zah * zbu * ze3wr * r1_e1e2t(ji+ip,jj) * zslope2
	147	akz (ji+ip,jj,jk+kp) = akz (ji+ip,jj,jk+kp) + zah * r1_e1u(ji,jj) &
	148	& * r1_e1u(ji,jj) * umask(ji,jj,jk+kp)
	149	!
	150	IF( ln_ldfeiv_dia ) zpsi_uw(ji,jj,jk+kp) = zpsi_uw(ji,jj,jk+kp) &
	151	& + 0.25_wp * aeiu(ji,jj,jk) * e2u(ji,jj) * zslope_skew
	152	END_3D
[2450]	153	END DO
	154	END DO
[5758]	155	!
	156	DO jp = 0, 1 ! j-k triads
	157	DO kp = 0, 1
[12377]	158	DO_3D_10_10( 1, jpkm1 )
	159	ze3wr = 1.0_wp / e3w(ji,jj+jp,jk+kp,Kmm)
	160	zbv = e1e2v(ji,jj) * e3v(ji,jj,jk,Kmm)
	161	zah = 0.25_wp * pahv(ji,jj,jk)
	162	zslope_skew = triadj_g(ji,jj+jp,jk,1-jp,kp)
	163	! Subtract s-coordinate slope at t-points to give slope rel to s surfaces
	164	! (do this by adding gradient of depth)
	165	zslope2 = zslope_skew + ( gdept(ji,jj+1,jk,Kmm) - gdept(ji,jj,jk,Kmm) ) * r1_e2v(ji,jj) * vmask(ji,jj,jk+kp)
	166	zslope2 = zslope2 * zslope2
	167	ah_wslp2(ji,jj+jp,jk+kp) = ah_wslp2(ji,jj+jp,jk+kp) + zah * zbv * ze3wr * r1_e1e2t(ji,jj+jp) * zslope2
	168	akz (ji,jj+jp,jk+kp) = akz (ji,jj+jp,jk+kp) + zah * r1_e2v(ji,jj) &
	169	& * r1_e2v(ji,jj) * vmask(ji,jj,jk+kp)
	170	!
	171	IF( ln_ldfeiv_dia ) zpsi_vw(ji,jj,jk+kp) = zpsi_vw(ji,jj,jk+kp) &
	172	& + 0.25 * aeiv(ji,jj,jk) * e1v(ji,jj) * zslope_skew
	173	END_3D
[2450]	174	END DO
	175	END DO
[5147]	176	!
[5758]	177	IF( ln_traldf_msc ) THEN ! stabilizing vertical diffusivity coefficient
	178	!
	179	IF( ln_traldf_blp ) THEN ! bilaplacian operator
[12377]	180	DO_3D_10_10( 2, jpkm1 )
	181	akz(ji,jj,jk) = 16._wp * ah_wslp2(ji,jj,jk) &
	182	& * ( akz(ji,jj,jk) + ah_wslp2(ji,jj,jk) / ( e3w(ji,jj,jk,Kmm) * e3w(ji,jj,jk,Kmm) ) )
	183	END_3D
[5758]	184	ELSEIF( ln_traldf_lap ) THEN ! laplacian operator
[12377]	185	DO_3D_10_10( 2, jpkm1 )
	186	ze3w_2 = e3w(ji,jj,jk,Kmm) * e3w(ji,jj,jk,Kmm)
[12511]	187	zcoef0 = rDt * ( akz(ji,jj,jk) + ah_wslp2(ji,jj,jk) / ze3w_2 )
	188	akz(ji,jj,jk) = MAX( zcoef0 - 0.5_wp , 0._wp ) * ze3w_2 * r1_Dt
[12377]	189	END_3D
[5758]	190	ENDIF
	191	!
	192	ELSE ! 33 flux set to zero with akz=ah_wslp2 ==>> computed in full implicit
	193	akz(:,:,:) = ah_wslp2(:,:,:)
[5147]	194	ENDIF
	195	!
[12377]	196	IF( ln_ldfeiv_dia .AND. cdtype == 'TRA' ) CALL ldf_eiv_dia( zpsi_uw, zpsi_vw, Kmm )
[5758]	197	!
	198	ENDIF !== end 1st pass only ==!
	199	!
	200	! ! ===========
	201	DO jn = 1, kjpt ! tracer loop
	202	! ! ===========
[2371]	203	! Zero fluxes for each tracer
[5758]	204	!!gm this should probably be done outside the jn loop
[2371]	205	ztfw(:,:,:) = 0._wp
	206	zftu(:,:,:) = 0._wp
	207	zftv(:,:,:) = 0._wp
[3294]	208	!
[12377]	209	DO_3D_10_10( 1, jpkm1 )
	210	zdit(ji,jj,jk) = ( pt(ji+1,jj ,jk,jn) - pt(ji,jj,jk,jn) ) * umask(ji,jj,jk)
	211	zdjt(ji,jj,jk) = ( pt(ji ,jj+1,jk,jn) - pt(ji,jj,jk,jn) ) * vmask(ji,jj,jk)
	212	END_3D
[5758]	213	IF( ln_zps .AND. l_grad_zps ) THEN ! partial steps: correction at top/bottom ocean level
[12377]	214	DO_2D_10_10
	215	zdit(ji,jj,mbku(ji,jj)) = pgu(ji,jj,jn)
	216	zdjt(ji,jj,mbkv(ji,jj)) = pgv(ji,jj,jn)
	217	END_2D
[5758]	218	IF( ln_isfcav ) THEN ! top level (ocean cavities only)
[12377]	219	DO_2D_10_10
	220	IF( miku(ji,jj) > 1 ) zdit(ji,jj,miku(ji,jj) ) = pgui(ji,jj,jn)
	221	IF( mikv(ji,jj) > 1 ) zdjt(ji,jj,mikv(ji,jj) ) = pgvi(ji,jj,jn)
	222	END_2D
[5758]	223	ENDIF
[2371]	224	ENDIF
[6140]	225	!
[2371]	226	!!----------------------------------------------------------------------
	227	!! II - horizontal trend (full)
	228	!!----------------------------------------------------------------------
	229	!
	230	DO jk = 1, jpkm1
	231	! !== Vertical tracer gradient at level jk and jk+1
[12377]	232	zdkt3d(:,:,1) = ( pt(:,:,jk,jn) - pt(:,:,jk+1,jn) ) * tmask(:,:,jk+1)
[2371]	233	!
[3294]	234	! ! surface boundary condition: zdkt3d(jk=0)=zdkt3d(jk=1)
	235	IF( jk == 1 ) THEN ; zdkt3d(:,:,0) = zdkt3d(:,:,1)
[12377]	236	ELSE ; zdkt3d(:,:,0) = ( pt(:,:,jk-1,jn) - pt(:,:,jk,jn) ) * tmask(:,:,jk)
[2371]	237	ENDIF
[5758]	238	!
	239	zaei_slp = 0._wp
	240	!
	241	IF( ln_botmix_triad ) THEN
[3294]	242	DO ip = 0, 1 !== Horizontal & vertical fluxes
	243	DO kp = 0, 1
[12377]	244	DO_2D_10_10
	245	ze1ur = r1_e1u(ji,jj)
	246	zdxt = zdit(ji,jj,jk) * ze1ur
	247	ze3wr = 1._wp / e3w(ji+ip,jj,jk+kp,Kmm)
	248	zdzt = zdkt3d(ji+ip,jj,kp) * ze3wr
	249	zslope_skew = triadi_g(ji+ip,jj,jk,1-ip,kp)
	250	zslope_iso = triadi (ji+ip,jj,jk,1-ip,kp)
	251	!
	252	zbu = 0.25_wp * e1e2u(ji,jj) * e3u(ji,jj,jk,Kmm)
	253	! ln_botmix_triad is .T. don't mask zah for bottom half cells !!gm ????? ahu is masked....
	254	zah = pahu(ji,jj,jk)
	255	zah_slp = zah * zslope_iso
	256	IF( ln_ldfeiv ) zaei_slp = aeiu(ji,jj,jk) * zslope_skew
	257	zftu(ji ,jj,jk ) = zftu(ji ,jj,jk ) - ( zah * zdxt + (zah_slp - zaei_slp) * zdzt ) * zbu * ze1ur
	258	ztfw(ji+ip,jj,jk+kp) = ztfw(ji+ip,jj,jk+kp) - ( zah_slp + zaei_slp) * zdxt * zbu * ze3wr
	259	END_2D
[2371]	260	END DO
	261	END DO
[6140]	262	!
[3294]	263	DO jp = 0, 1
	264	DO kp = 0, 1
[12377]	265	DO_2D_10_10
	266	ze2vr = r1_e2v(ji,jj)
	267	zdyt = zdjt(ji,jj,jk) * ze2vr
	268	ze3wr = 1._wp / e3w(ji,jj+jp,jk+kp,Kmm)
	269	zdzt = zdkt3d(ji,jj+jp,kp) * ze3wr
	270	zslope_skew = triadj_g(ji,jj+jp,jk,1-jp,kp)
	271	zslope_iso = triadj(ji,jj+jp,jk,1-jp,kp)
	272	zbv = 0.25_wp * e1e2v(ji,jj) * e3v(ji,jj,jk,Kmm)
	273	! ln_botmix_triad is .T. don't mask zah for bottom half cells !!gm ????? ahv is masked...
	274	zah = pahv(ji,jj,jk)
	275	zah_slp = zah * zslope_iso
	276	IF( ln_ldfeiv ) zaei_slp = aeiv(ji,jj,jk) * zslope_skew
	277	zftv(ji,jj ,jk ) = zftv(ji,jj ,jk ) - ( zah * zdyt + (zah_slp - zaei_slp) * zdzt ) * zbv * ze2vr
	278	ztfw(ji,jj+jp,jk+kp) = ztfw(ji,jj+jp,jk+kp) - ( zah_slp + zaei_slp ) * zdyt * zbv * ze3wr
	279	END_2D
[2371]	280	END DO
	281	END DO
[6140]	282	!
[3294]	283	ELSE
[6140]	284	!
[5758]	285	DO ip = 0, 1 !== Horizontal & vertical fluxes
[3294]	286	DO kp = 0, 1
[12377]	287	DO_2D_10_10
	288	ze1ur = r1_e1u(ji,jj)
	289	zdxt = zdit(ji,jj,jk) * ze1ur
	290	ze3wr = 1._wp / e3w(ji+ip,jj,jk+kp,Kmm)
	291	zdzt = zdkt3d(ji+ip,jj,kp) * ze3wr
	292	zslope_skew = triadi_g(ji+ip,jj,jk,1-ip,kp)
	293	zslope_iso = triadi(ji+ip,jj,jk,1-ip,kp)
	294	!
	295	zbu = 0.25_wp * e1e2u(ji,jj) * e3u(ji,jj,jk,Kmm)
	296	! ln_botmix_triad is .F. mask zah for bottom half cells
	297	zah = pahu(ji,jj,jk) * umask(ji,jj,jk+kp) ! pahu(ji+ip,jj,jk) ===>> ????
	298	zah_slp = zah * zslope_iso
	299	IF( ln_ldfeiv ) zaei_slp = aeiu(ji,jj,jk) * zslope_skew ! aeit(ji+ip,jj,jk)*zslope_skew
	300	zftu(ji ,jj,jk ) = zftu(ji ,jj,jk ) - ( zah * zdxt + (zah_slp - zaei_slp) * zdzt ) * zbu * ze1ur
	301	ztfw(ji+ip,jj,jk+kp) = ztfw(ji+ip,jj,jk+kp) - (zah_slp + zaei_slp) * zdxt * zbu * ze3wr
	302	END_2D
[3294]	303	END DO
	304	END DO
[6140]	305	!
[3294]	306	DO jp = 0, 1
	307	DO kp = 0, 1
[12377]	308	DO_2D_10_10
	309	ze2vr = r1_e2v(ji,jj)
	310	zdyt = zdjt(ji,jj,jk) * ze2vr
	311	ze3wr = 1._wp / e3w(ji,jj+jp,jk+kp,Kmm)
	312	zdzt = zdkt3d(ji,jj+jp,kp) * ze3wr
	313	zslope_skew = triadj_g(ji,jj+jp,jk,1-jp,kp)
	314	zslope_iso = triadj(ji,jj+jp,jk,1-jp,kp)
	315	zbv = 0.25_wp * e1e2v(ji,jj) * e3v(ji,jj,jk,Kmm)
	316	! ln_botmix_triad is .F. mask zah for bottom half cells
	317	zah = pahv(ji,jj,jk) * vmask(ji,jj,jk+kp) ! pahv(ji,jj+jp,jk) ????
	318	zah_slp = zah * zslope_iso
	319	IF( ln_ldfeiv ) zaei_slp = aeiv(ji,jj,jk) * zslope_skew ! aeit(ji,jj+jp,jk)*zslope_skew
	320	zftv(ji,jj,jk) = zftv(ji,jj,jk) - ( zah * zdyt + (zah_slp - zaei_slp) * zdzt ) * zbv * ze2vr
	321	ztfw(ji,jj+jp,jk+kp) = ztfw(ji,jj+jp,jk+kp) - (zah_slp + zaei_slp) * zdyt * zbv * ze3wr
	322	END_2D
[3294]	323	END DO
	324	END DO
[5758]	325	ENDIF
	326	! !== horizontal divergence and add to the general trend ==!
[12377]	327	DO_2D_00_00
	328	pt_rhs(ji,jj,jk,jn) = pt_rhs(ji,jj,jk,jn) + zsign * ( zftu(ji-1,jj,jk) - zftu(ji,jj,jk) &
	329	& + zftv(ji,jj-1,jk) - zftv(ji,jj,jk) ) &
	330	& / ( e1e2t(ji,jj) * e3t(ji,jj,jk,Kmm) )
	331	END_2D
[2450]	332	!
	333	END DO
	334	!
[5758]	335	! !== add the vertical 33 flux ==!
	336	IF( ln_traldf_lap ) THEN ! laplacian case: eddy coef = ah_wslp2 - akz
[12377]	337	DO_3D_10_00( 2, jpkm1 )
	338	ztfw(ji,jj,jk) = ztfw(ji,jj,jk) - e1e2t(ji,jj) / e3w(ji,jj,jk,Kmm) * tmask(ji,jj,jk) &
	339	& * ( ah_wslp2(ji,jj,jk) - akz(ji,jj,jk) ) &
	340	& * ( pt(ji,jj,jk-1,jn) - pt(ji,jj,jk,jn) )
	341	END_3D
[5758]	342	ELSE ! bilaplacian
	343	SELECT CASE( kpass )
	344	CASE( 1 ) ! 1st pass : eddy coef = ah_wslp2
[12377]	345	DO_3D_10_00( 2, jpkm1 )
	346	ztfw(ji,jj,jk) = ztfw(ji,jj,jk) - e1e2t(ji,jj) / e3w(ji,jj,jk,Kmm) * tmask(ji,jj,jk) &
	347	& * ah_wslp2(ji,jj,jk) * ( pt(ji,jj,jk-1,jn) - pt(ji,jj,jk,jn) )
	348	END_3D
	349	CASE( 2 ) ! 2nd pass : eddy flux = ah_wslp2 and akz applied on pt and pt2 gradients, resp.
	350	DO_3D_10_00( 2, jpkm1 )
	351	ztfw(ji,jj,jk) = ztfw(ji,jj,jk) - e1e2t(ji,jj) / e3w(ji,jj,jk,Kmm) * tmask(ji,jj,jk) &
	352	& * ( ah_wslp2(ji,jj,jk) * ( pt (ji,jj,jk-1,jn) - pt (ji,jj,jk,jn) ) &
	353	& + akz (ji,jj,jk) * ( pt2(ji,jj,jk-1,jn) - pt2(ji,jj,jk,jn) ) )
	354	END_3D
[5758]	355	END SELECT
	356	ENDIF
	357	!
[12377]	358	DO_3D_00_00( 1, jpkm1 )
	359	pt_rhs(ji,jj,jk,jn) = pt_rhs(ji,jj,jk,jn) + zsign * ( ztfw(ji,jj,jk+1) - ztfw(ji,jj,jk) ) &
	360	& / ( e1e2t(ji,jj) * e3t(ji,jj,jk,Kmm) )
	361	END_3D
[2450]	362	!
[5758]	363	IF( ( kpass == 1 .AND. ln_traldf_lap ) .OR. & !== first pass only ( laplacian) ==!
	364	( kpass == 2 .AND. ln_traldf_blp ) ) THEN !== 2nd pass (bilaplacian) ==!
	365	!
	366	! ! "Poleward" diffusive heat or salt transports (T-S case only)
[7646]	367	IF( l_ptr ) CALL dia_ptr_hst( jn, 'ldf', zftv(:,:,:) )
	368	! ! Diffusive heat transports
	369	IF( l_hst ) CALL dia_ar5_hst( jn, 'ldf', zftu(:,:,:), zftv(:,:,:) )
[5758]	370	!
	371	ENDIF !== end pass selection ==!
[2450]	372	!
[5758]	373	! ! ===============
	374	END DO ! end tracer loop
	375	! ! ===============
	376	END SUBROUTINE tra_ldf_triad
[2371]	377
[2205]	378	!!==============================================================================
[5758]	379	END MODULE traldf_triad

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