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sshwzv.F90 in NEMO/branches/2020/dev_r12558_HPC-08_epico_Extra_Halo/src/OCE/DYN – NEMO

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source: NEMO/branches/2020/dev_r12558_HPC-08_epico_Extra_Halo/src/OCE/DYN/sshwzv.F90 @ 13232

Last change on this file since 13232 was 13232, checked in by smasson, 4 years ago
dev_r12558_HPC-08_epico_Extra_Halo: final-finish merge with trunk@13218, see #2366
Property svn:keywords set to `Id`
File size: 19.7 KB

Rev	Line
[1565]	1	MODULE sshwzv
[3]	2	!!==============================================================================
[1438]	3	!! * MODULE sshwzv *
	4	!! Ocean dynamics : sea surface height and vertical velocity
[3]	5	!!==============================================================================
[1438]	6	!! History : 3.1 ! 2009-02 (G. Madec, M. Leclair) Original code
[2528]	7	!! 3.3 ! 2010-04 (M. Leclair, G. Madec) modified LF-RA
	8	!! - ! 2010-05 (K. Mogensen, A. Weaver, M. Martin, D. Lea) Assimilation interface
	9	!! - ! 2010-09 (D.Storkey and E.O'Dea) bug fixes for BDY module
[4292]	10	!! 3.3 ! 2011-10 (M. Leclair) split former ssh_wzv routine and remove all vvl related work
[11414]	11	!! 4.0 ! 2018-12 (A. Coward) add mixed implicit/explicit advection
[12377]	12	!! 4.1 ! 2019-08 (A. Coward, D. Storkey) Rename ssh_nxt -> ssh_atf. Now only does time filtering.
[3]	13	!!----------------------------------------------------------------------
[1438]	14
[3]	15	!!----------------------------------------------------------------------
[6140]	16	!! ssh_nxt : after ssh
[12377]	17	!! ssh_atf : time filter the ssh arrays
[6140]	18	!! wzv : compute now vertical velocity
[1438]	19	!!----------------------------------------------------------------------
[6140]	20	USE oce ! ocean dynamics and tracers variables
[12377]	21	USE isf_oce ! ice shelf
[6140]	22	USE dom_oce ! ocean space and time domain variables
	23	USE sbc_oce ! surface boundary condition: ocean
	24	USE domvvl ! Variable volume
	25	USE divhor ! horizontal divergence
	26	USE phycst ! physical constants
[9019]	27	USE bdy_oce , ONLY : ln_bdy, bdytmask ! Open BounDarY
[6140]	28	USE bdydyn2d ! bdy_ssh routine
[2528]	29	#if defined key_agrif
[13232]	30	USE agrif_oce
[9570]	31	USE agrif_oce_interp
[2528]	32	#endif
[6140]	33	!
[10364]	34	USE iom
[6140]	35	USE in_out_manager ! I/O manager
	36	USE restart ! only for lrst_oce
	37	USE prtctl ! Print control
	38	USE lbclnk ! ocean lateral boundary condition (or mpp link)
	39	USE lib_mpp ! MPP library
	40	USE timing ! Timing
[9023]	41	USE wet_dry ! Wetting/Drying flux limiting
[592]	42
[3]	43	IMPLICIT NONE
	44	PRIVATE
	45
[1438]	46	PUBLIC ssh_nxt ! called by step.F90
[4292]	47	PUBLIC wzv ! called by step.F90
[10364]	48	PUBLIC wAimp ! called by step.F90
[12377]	49	PUBLIC ssh_atf ! called by step.F90
[3]	50
	51	!! * Substitutions
[12377]	52	# include "do_loop_substitute.h90"
[3]	53	!!----------------------------------------------------------------------
[9598]	54	!! NEMO/OCE 4.0 , NEMO Consortium (2018)
[888]	55	!! $Id$
[10068]	56	!! Software governed by the CeCILL license (see ./LICENSE)
[592]	57	!!----------------------------------------------------------------------
[3]	58	CONTAINS
	59
[12377]	60	SUBROUTINE ssh_nxt( kt, Kbb, Kmm, pssh, Kaa )
[3]	61	!!----------------------------------------------------------------------
[4292]	62	!! * ROUTINE ssh_nxt *
[1438]	63	!!
[12377]	64	!! ** Purpose : compute the after ssh (ssh(Kaa))
[3]	65	!!
[4292]	66	!! ** Method : - Using the incompressibility hypothesis, the ssh increment
	67	!! is computed by integrating the horizontal divergence and multiply by
	68	!! by the time step.
[3]	69	!!
[12377]	70	!! ** action : ssh(:,:,Kaa), after sea surface height
[2528]	71	!!
	72	!! Reference : Leclair, M., and G. Madec, 2009, Ocean Modelling.
[3]	73	!!----------------------------------------------------------------------
[12377]	74	INTEGER , INTENT(in ) :: kt ! time step
	75	INTEGER , INTENT(in ) :: Kbb, Kmm, Kaa ! time level index
	76	REAL(wp), DIMENSION(jpi,jpj,jpt), INTENT(inout) :: pssh ! sea-surface height
[4292]	77	!
[12489]	78	INTEGER :: jk ! dummy loop index
	79	REAL(wp) :: zcoef ! local scalar
[9019]	80	REAL(wp), DIMENSION(jpi,jpj) :: zhdiv ! 2D workspace
[3]	81	!!----------------------------------------------------------------------
[3294]	82	!
[9019]	83	IF( ln_timing ) CALL timing_start('ssh_nxt')
[3294]	84	!
[3]	85	IF( kt == nit000 ) THEN
	86	IF(lwp) WRITE(numout,*)
[4292]	87	IF(lwp) WRITE(numout,*) 'ssh_nxt : after sea surface height'
[1438]	88	IF(lwp) WRITE(numout,*) '~~~~~~~ '
[3]	89	ENDIF
[2528]	90	!
[12489]	91	zcoef = 0.5_wp * r1_rho0
[3]	92
[1438]	93	! !------------------------------!
	94	! ! After Sea Surface Height !
	95	! !------------------------------!
[9023]	96	IF(ln_wd_il) THEN
[12489]	97	CALL wad_lmt(pssh(:,:,Kbb), zcoef * (emp_b(:,:) + emp(:,:)), rDt, Kmm, uu, vv )
[7753]	98	ENDIF
[7646]	99
[12377]	100	CALL div_hor( kt, Kbb, Kmm ) ! Horizontal divergence
[7646]	101	!
[7753]	102	zhdiv(:,:) = 0._wp
[1438]	103	DO jk = 1, jpkm1 ! Horizontal divergence of barotropic transports
[12377]	104	zhdiv(:,:) = zhdiv(:,:) + e3t(:,:,jk,Kmm) * hdiv(:,:,jk)
[1438]	105	END DO
	106	! ! Sea surface elevation time stepping
[4338]	107	! In time-split case we need a first guess of the ssh after (using the baroclinic timestep) in order to
	108	! compute the vertical velocity which can be used to compute the non-linear terms of the momentum equations.
	109	!
[12489]	110	pssh(:,:,Kaa) = ( pssh(:,:,Kbb) - rDt * ( zcoef * ( emp_b(:,:) + emp(:,:) ) + zhdiv(:,:) ) ) * ssmask(:,:)
[9023]	111	!
	112	#if defined key_agrif
[12377]	113	Kbb_a = Kbb; Kmm_a = Kmm; Krhs_a = Kaa; CALL agrif_ssh( kt )
[9023]	114	#endif
	115	!
[5930]	116	IF ( .NOT.ln_dynspg_ts ) THEN
[7646]	117	IF( ln_bdy ) THEN
[12377]	118	CALL lbc_lnk( 'sshwzv', pssh(:,:,Kaa), 'T', 1. ) ! Not sure that's necessary
	119	CALL bdy_ssh( pssh(:,:,Kaa) ) ! Duplicate sea level across open boundaries
[5930]	120	ENDIF
[4292]	121	ENDIF
	122	! !------------------------------!
	123	! ! outputs !
	124	! !------------------------------!
	125	!
[12377]	126	IF(sn_cfctl%l_prtctl) CALL prt_ctl( tab2d_1=pssh(:,:,Kaa), clinfo1=' pssh(:,:,Kaa) - : ', mask1=tmask )
[4292]	127	!
[9019]	128	IF( ln_timing ) CALL timing_stop('ssh_nxt')
[4292]	129	!
	130	END SUBROUTINE ssh_nxt
	131
	132
[12377]	133	SUBROUTINE wzv( kt, Kbb, Kmm, pww, Kaa )
[4292]	134	!!----------------------------------------------------------------------
	135	!! * ROUTINE wzv *
	136	!!
	137	!! ** Purpose : compute the now vertical velocity
	138	!!
	139	!! ** Method : - Using the incompressibility hypothesis, the vertical
	140	!! velocity is computed by integrating the horizontal divergence
	141	!! from the bottom to the surface minus the scale factor evolution.
	142	!! The boundary conditions are w=0 at the bottom (no flux) and.
	143	!!
[12377]	144	!! ** action : pww : now vertical velocity
[4292]	145	!!
	146	!! Reference : Leclair, M., and G. Madec, 2009, Ocean Modelling.
	147	!!----------------------------------------------------------------------
[12377]	148	INTEGER , INTENT(in) :: kt ! time step
	149	INTEGER , INTENT(in) :: Kbb, Kmm, Kaa ! time level indices
	150	REAL(wp), DIMENSION(jpi,jpj,jpk), INTENT(inout) :: pww ! now vertical velocity
[4292]	151	!
[5836]	152	INTEGER :: ji, jj, jk ! dummy loop indices
[9019]	153	REAL(wp), ALLOCATABLE, DIMENSION(:,:,:) :: zhdiv
[4292]	154	!!----------------------------------------------------------------------
	155	!
[9019]	156	IF( ln_timing ) CALL timing_start('wzv')
[5836]	157	!
[4292]	158	IF( kt == nit000 ) THEN
	159	IF(lwp) WRITE(numout,*)
	160	IF(lwp) WRITE(numout,*) 'wzv : now vertical velocity '
	161	IF(lwp) WRITE(numout,*) '~~~~~ '
	162	!
[12377]	163	pww(:,:,jpk) = 0._wp ! bottom boundary condition: w=0 (set once for all)
[4292]	164	ENDIF
	165	! !------------------------------!
	166	! ! Now Vertical Velocity !
	167	! !------------------------------!
	168	!
	169	IF( ln_vvl_ztilde .OR. ln_vvl_layer ) THEN ! z_tilde and layer cases
[9019]	170	ALLOCATE( zhdiv(jpi,jpj,jpk) )
[4292]	171	!
	172	DO jk = 1, jpkm1
	173	! horizontal divergence of thickness diffusion transport ( velocity multiplied by e3t)
[4338]	174	! - ML - note: computation already done in dom_vvl_sf_nxt. Could be optimized (not critical and clearer this way)
[12377]	175	DO_2D_00_00
	176	zhdiv(ji,jj,jk) = r1_e1e2t(ji,jj) * ( un_td(ji,jj,jk) - un_td(ji-1,jj,jk) + vn_td(ji,jj,jk) - vn_td(ji,jj-1,jk) )
	177	END_2D
[592]	178	END DO
[10425]	179	CALL lbc_lnk('sshwzv', zhdiv, 'T', 1.) ! - ML - Perhaps not necessary: not used for horizontal "connexions"
[4292]	180	! ! Is it problematic to have a wrong vertical velocity in boundary cells?
[12377]	181	! ! Same question holds for hdiv. Perhaps just for security
[4292]	182	DO jk = jpkm1, 1, -1 ! integrate from the bottom the hor. divergence
	183	! computation of w
[12377]	184	pww(:,:,jk) = pww(:,:,jk+1) - ( e3t(:,:,jk,Kmm) * hdiv(:,:,jk) + zhdiv(:,:,jk) &
[12489]	185	& + r1_Dt * ( e3t(:,:,jk,Kaa) - e3t(:,:,jk,Kbb) ) ) * tmask(:,:,jk)
[4292]	186	END DO
[12377]	187	! IF( ln_vvl_layer ) pww(:,:,:) = 0.e0
[9019]	188	DEALLOCATE( zhdiv )
[4292]	189	ELSE ! z_star and linear free surface cases
	190	DO jk = jpkm1, 1, -1 ! integrate from the bottom the hor. divergence
[7753]	191	! computation of w
[12377]	192	pww(:,:,jk) = pww(:,:,jk+1) - ( e3t(:,:,jk,Kmm) * hdiv(:,:,jk) &
[12489]	193	& + r1_Dt * ( e3t(:,:,jk,Kaa) - e3t(:,:,jk,Kbb) ) ) * tmask(:,:,jk)
[4292]	194	END DO
[1438]	195	ENDIF
[592]	196
[7646]	197	IF( ln_bdy ) THEN
[4327]	198	DO jk = 1, jpkm1
[12377]	199	pww(:,:,jk) = pww(:,:,jk) * bdytmask(:,:)
[4327]	200	END DO
	201	ENDIF
[4292]	202	!
[13232]	203	#if defined key_agrif
[12980]	204	IF( .NOT. AGRIF_Root() ) THEN
	205	!
	206	! Mask vertical velocity at first/last columns/row
	207	! inside computational domain (cosmetic)
[13138]	208	DO jk = 1, jpkm1
	209	! --- West --- !
[13230]	210	IF( lk_west) THEN
[13229]	211	DO ji = mi0(2+nn_hls), mi1(2+nn_hls)
	212	DO jj = 1, jpj
	213	pww(ji,jj,jk) = 0._wp
	214	END DO
[13138]	215	END DO
[13229]	216	ENDIF
[13138]	217	!
	218	! --- East --- !
[13230]	219	IF( lk_east) THEN
[13229]	220	DO ji = mi0(jpiglo-1-nn_hls), mi1(jpiglo-1-nn_hls)
	221	DO jj = 1, jpj
	222	pww(ji,jj,jk) = 0._wp
	223	END DO
[13138]	224	END DO
[13229]	225	ENDIF
[13138]	226	!
	227	! --- South --- !
[13230]	228	IF( lk_south) THEN
[13229]	229	DO jj = mj0(2+nn_hls), mj1(2+nn_hls)
	230	DO ji = 1, jpi
	231	pww(ji,jj,jk) = 0._wp
	232	END DO
[13138]	233	END DO
[13229]	234	ENDIF
[13138]	235	!
	236	! --- North --- !
[13230]	237	IF( lk_north) THEN
[13229]	238	DO jj = mj0(jpjglo-1-nn_hls), mj1(jpjglo-1-nn_hls)
	239	DO ji = 1, jpi
	240	pww(ji,jj,jk) = 0._wp
	241	END DO
[13138]	242	END DO
[13229]	243	ENDIF
[13230]	244	!
[13138]	245	END DO
[12980]	246	!
[9023]	247	ENDIF
[13232]	248	#endif
[5836]	249	!
[9124]	250	IF( ln_timing ) CALL timing_stop('wzv')
[9023]	251	!
[5836]	252	END SUBROUTINE wzv
[592]	253
	254
[12377]	255	SUBROUTINE ssh_atf( kt, Kbb, Kmm, Kaa, pssh )
[1438]	256	!!----------------------------------------------------------------------
[12377]	257	!! * ROUTINE ssh_atf *
[1438]	258	!!
[12377]	259	!! ** Purpose : Apply Asselin time filter to now SSH.
[1438]	260	!!
[2528]	261	!! ** Method : - apply Asselin time fiter to now ssh (excluding the forcing
	262	!! from the filter, see Leclair and Madec 2010) and swap :
[12489]	263	!! pssh(:,:,Kmm) = pssh(:,:,Kaa) + rn_atfp * ( pssh(:,:,Kbb) -2 pssh(:,:,Kmm) + pssh(:,:,Kaa) )
	264	!! - rn_atfp * rn_Dt * ( emp_b - emp ) / rho0
[1438]	265	!!
[12377]	266	!! ** action : - pssh(:,:,Kmm) time filtered
[2528]	267	!!
	268	!! Reference : Leclair, M., and G. Madec, 2009, Ocean Modelling.
[1438]	269	!!----------------------------------------------------------------------
[12377]	270	INTEGER , INTENT(in ) :: kt ! ocean time-step index
	271	INTEGER , INTENT(in ) :: Kbb, Kmm, Kaa ! ocean time level indices
	272	REAL(wp), DIMENSION(jpi,jpj,jpt), INTENT(inout) :: pssh ! SSH field
[6140]	273	!
	274	REAL(wp) :: zcoef ! local scalar
[1438]	275	!!----------------------------------------------------------------------
[3294]	276	!
[12377]	277	IF( ln_timing ) CALL timing_start('ssh_atf')
[3294]	278	!
[1438]	279	IF( kt == nit000 ) THEN
	280	IF(lwp) WRITE(numout,*)
[12377]	281	IF(lwp) WRITE(numout,*) 'ssh_atf : Asselin time filter of sea surface height'
[1438]	282	IF(lwp) WRITE(numout,*) '~~~~~~~ '
	283	ENDIF
[6140]	284	! !== Euler time-stepping: no filter, just swap ==!
[12489]	285	IF ( .NOT.( l_1st_euler ) ) THEN ! Only do time filtering for leapfrog timesteps
[12377]	286	! ! filtered "now" field
[12489]	287	pssh(:,:,Kmm) = pssh(:,:,Kmm) + rn_atfp * ( pssh(:,:,Kbb) - 2 * pssh(:,:,Kmm) + pssh(:,:,Kaa) )
[12377]	288	IF( .NOT.ln_linssh ) THEN ! "now" <-- with forcing removed
[12489]	289	zcoef = rn_atfp * rn_Dt * r1_rho0
[12377]	290	pssh(:,:,Kmm) = pssh(:,:,Kmm) - zcoef * ( emp_b(:,:) - emp (:,:) &
	291	& - rnf_b(:,:) + rnf (:,:) &
	292	& + fwfisf_cav_b(:,:) - fwfisf_cav(:,:) &
	293	& + fwfisf_par_b(:,:) - fwfisf_par(:,:) ) * ssmask(:,:)
	294
	295	! ice sheet coupling
[12489]	296	IF ( ln_isf .AND. ln_isfcpl .AND. kt == nit000+1) pssh(:,:,Kbb) = pssh(:,:,Kbb) - rn_atfp * rn_Dt * ( risfcpl_ssh(:,:) - 0.0 ) * ssmask(:,:)
[12377]	297
[6140]	298	ENDIF
[1438]	299	ENDIF
	300	!
[12377]	301	IF(sn_cfctl%l_prtctl) CALL prt_ctl( tab2d_1=pssh(:,:,Kmm), clinfo1=' pssh(:,:,Kmm) - : ', mask1=tmask )
[2528]	302	!
[12377]	303	IF( ln_timing ) CALL timing_stop('ssh_atf')
[3294]	304	!
[12377]	305	END SUBROUTINE ssh_atf
[3]	306
[12377]	307	SUBROUTINE wAimp( kt, Kmm )
[10364]	308	!!----------------------------------------------------------------------
	309	!! * ROUTINE wAimp *
	310	!!
	311	!! ** Purpose : compute the Courant number and partition vertical velocity
	312	!! if a proportion needs to be treated implicitly
	313	!!
	314	!! ** Method : -
	315	!!
[12377]	316	!! ** action : ww : now vertical velocity (to be handled explicitly)
[10364]	317	!! : wi : now vertical velocity (for implicit treatment)
	318	!!
[11414]	319	!! Reference : Shchepetkin, A. F. (2015): An adaptive, Courant-number-dependent
	320	!! implicit scheme for vertical advection in oceanic modeling.
	321	!! Ocean Modelling, 91, 38-69.
[10364]	322	!!----------------------------------------------------------------------
	323	INTEGER, INTENT(in) :: kt ! time step
[12377]	324	INTEGER, INTENT(in) :: Kmm ! time level index
[10364]	325	!
	326	INTEGER :: ji, jj, jk ! dummy loop indices
[11293]	327	REAL(wp) :: zCu, zcff, z1_e3t ! local scalars
[10364]	328	REAL(wp) , PARAMETER :: Cu_min = 0.15_wp ! local parameters
[11407]	329	REAL(wp) , PARAMETER :: Cu_max = 0.30_wp ! local parameters
[10364]	330	REAL(wp) , PARAMETER :: Cu_cut = 2._wp*Cu_max - Cu_min ! local parameters
	331	REAL(wp) , PARAMETER :: Fcu = 4._wpCu_max(Cu_max-Cu_min) ! local parameters
	332	!!----------------------------------------------------------------------
	333	!
	334	IF( ln_timing ) CALL timing_start('wAimp')
	335	!
	336	IF( kt == nit000 ) THEN
	337	IF(lwp) WRITE(numout,*)
	338	IF(lwp) WRITE(numout,*) 'wAimp : Courant number-based partitioning of now vertical velocity '
	339	IF(lwp) WRITE(numout,*) '~~~~~ '
[11293]	340	wi(:,:,:) = 0._wp
[10364]	341	ENDIF
	342	!
[11414]	343	! Calculate Courant numbers
	344	IF( ln_vvl_ztilde .OR. ln_vvl_layer ) THEN
[12377]	345	DO_3D_00_00( 1, jpkm1 )
	346	z1_e3t = 1._wp / e3t(ji,jj,jk,Kmm)
[12489]	347	! 2*rn_Dt and not rDt (for restartability)
	348	Cu_adv(ji,jj,jk) = 2._wp * rn_Dt * ( ( MAX( ww(ji,jj,jk) , 0._wp ) - MIN( ww(ji,jj,jk+1) , 0._wp ) ) &
[12377]	349	& + ( MAX( e2u(ji ,jj)e3u(ji ,jj,jk,Kmm)uu(ji ,jj,jk,Kmm) + un_td(ji ,jj,jk), 0._wp ) - &
	350	& MIN( e2u(ji-1,jj)e3u(ji-1,jj,jk,Kmm)uu(ji-1,jj,jk,Kmm) + un_td(ji-1,jj,jk), 0._wp ) ) &
	351	& * r1_e1e2t(ji,jj) &
	352	& + ( MAX( e1v(ji,jj )e3v(ji,jj ,jk,Kmm)vv(ji,jj ,jk,Kmm) + vn_td(ji,jj ,jk), 0._wp ) - &
	353	& MIN( e1v(ji,jj-1)e3v(ji,jj-1,jk,Kmm)vv(ji,jj-1,jk,Kmm) + vn_td(ji,jj-1,jk), 0._wp ) ) &
	354	& * r1_e1e2t(ji,jj) &
	355	& ) * z1_e3t
	356	END_3D
[11414]	357	ELSE
[12377]	358	DO_3D_00_00( 1, jpkm1 )
	359	z1_e3t = 1._wp / e3t(ji,jj,jk,Kmm)
[12489]	360	! 2*rn_Dt and not rDt (for restartability)
	361	Cu_adv(ji,jj,jk) = 2._wp * rn_Dt * ( ( MAX( ww(ji,jj,jk) , 0._wp ) - MIN( ww(ji,jj,jk+1) , 0._wp ) ) &
[12377]	362	& + ( MAX( e2u(ji ,jj)e3u(ji ,jj,jk,Kmm)uu(ji ,jj,jk,Kmm), 0._wp ) - &
	363	& MIN( e2u(ji-1,jj)e3u(ji-1,jj,jk,Kmm)uu(ji-1,jj,jk,Kmm), 0._wp ) ) &
	364	& * r1_e1e2t(ji,jj) &
	365	& + ( MAX( e1v(ji,jj )e3v(ji,jj ,jk,Kmm)vv(ji,jj ,jk,Kmm), 0._wp ) - &
	366	& MIN( e1v(ji,jj-1)e3v(ji,jj-1,jk,Kmm)vv(ji,jj-1,jk,Kmm), 0._wp ) ) &
	367	& * r1_e1e2t(ji,jj) &
	368	& ) * z1_e3t
	369	END_3D
[11414]	370	ENDIF
[10907]	371	CALL lbc_lnk( 'sshwzv', Cu_adv, 'T', 1. )
[10364]	372	!
	373	CALL iom_put("Courant",Cu_adv)
	374	!
	375	IF( MAXVAL( Cu_adv(:,:,:) ) > Cu_min ) THEN ! Quick check if any breaches anywhere
[12377]	376	DO_3DS_11_11( jpkm1, 2, -1 )
	377	!
	378	zCu = MAX( Cu_adv(ji,jj,jk) , Cu_adv(ji,jj,jk-1) )
[11293]	379	! alt:
[12377]	380	! IF ( ww(ji,jj,jk) > 0._wp ) THEN
[11293]	381	! zCu = Cu_adv(ji,jj,jk)
	382	! ELSE
	383	! zCu = Cu_adv(ji,jj,jk-1)
	384	! ENDIF
[12377]	385	!
	386	IF( zCu <= Cu_min ) THEN !<-- Fully explicit
	387	zcff = 0._wp
	388	ELSEIF( zCu < Cu_cut ) THEN !<-- Mixed explicit
	389	zcff = ( zCu - Cu_min )**2
	390	zcff = zcff / ( Fcu + zcff )
	391	ELSE !<-- Mostly implicit
	392	zcff = ( zCu - Cu_max )/ zCu
	393	ENDIF
	394	zcff = MIN(1._wp, zcff)
	395	!
	396	wi(ji,jj,jk) = zcff * ww(ji,jj,jk)
	397	ww(ji,jj,jk) = ( 1._wp - zcff ) * ww(ji,jj,jk)
	398	!
	399	Cu_adv(ji,jj,jk) = zcff ! Reuse array to output coefficient below and in stp_ctl
	400	END_3D
[11293]	401	Cu_adv(:,:,1) = 0._wp
[10364]	402	ELSE
	403	! Fully explicit everywhere
[11407]	404	Cu_adv(:,:,:) = 0._wp ! Reuse array to output coefficient below and in stp_ctl
[10907]	405	wi (:,:,:) = 0._wp
[10364]	406	ENDIF
	407	CALL iom_put("wimp",wi)
	408	CALL iom_put("wi_cff",Cu_adv)
[12377]	409	CALL iom_put("wexp",ww)
[10364]	410	!
	411	IF( ln_timing ) CALL timing_stop('wAimp')
	412	!
	413	END SUBROUTINE wAimp
[3]	414	!!======================================================================
[1565]	415	END MODULE sshwzv

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