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sshwzv.F90 in NEMO/trunk/src/OCE/DYN – NEMO

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source: NEMO/trunk/src/OCE/DYN/sshwzv.F90 @ 14205

Last change on this file since 14205 was 14205, checked in by techene, 4 years ago
#2385 cosmetics and cleaning
Property svn:keywords set to `Id`
File size: 21.5 KB

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[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
[14053]	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
	10	!! 3.3 ! 2011-10 (M. Leclair) split former ssh_wzv routine and remove all vvl related work
	11	!! 4.0 ! 2018-12 (A. Coward) add mixed implicit/explicit advection
	12	!! 4.1 ! 2019-08 (A. Coward, D. Storkey) Rename ssh_nxt -> ssh_atf. Now only does time filtering.
	13	!! - ! 2020-08 (S. Techene, G. Madec) add here ssh initiatlisation
[3]	14	!!----------------------------------------------------------------------
[1438]	15
[3]	16	!!----------------------------------------------------------------------
[6140]	17	!! ssh_nxt : after ssh
[12377]	18	!! ssh_atf : time filter the ssh arrays
[6140]	19	!! wzv : compute now vertical velocity
[1438]	20	!!----------------------------------------------------------------------
[6140]	21	USE oce ! ocean dynamics and tracers variables
[12377]	22	USE isf_oce ! ice shelf
[6140]	23	USE dom_oce ! ocean space and time domain variables
	24	USE sbc_oce ! surface boundary condition: ocean
	25	USE domvvl ! Variable volume
	26	USE divhor ! horizontal divergence
	27	USE phycst ! physical constants
[9019]	28	USE bdy_oce , ONLY : ln_bdy, bdytmask ! Open BounDarY
[6140]	29	USE bdydyn2d ! bdy_ssh routine
[14139]	30	USE wet_dry ! Wetting/Drying flux limiting
[2528]	31	#if defined key_agrif
[13286]	32	USE agrif_oce
[9570]	33	USE agrif_oce_interp
[2528]	34	#endif
[6140]	35	!
[10364]	36	USE iom
[6140]	37	USE in_out_manager ! I/O manager
	38	USE restart ! only for lrst_oce
	39	USE prtctl ! Print control
	40	USE lbclnk ! ocean lateral boundary condition (or mpp link)
	41	USE lib_mpp ! MPP library
	42	USE timing ! Timing
[14053]	43
[3]	44	IMPLICIT NONE
	45	PRIVATE
	46
[14053]	47	PUBLIC ssh_nxt ! called by step.F90
	48	PUBLIC wzv ! called by step.F90
	49	PUBLIC wAimp ! called by step.F90
	50	PUBLIC ssh_atf ! called by step.F90
[3]	51
	52	!! * Substitutions
[12377]	53	# include "do_loop_substitute.h90"
[13237]	54	# include "domzgr_substitute.h90"
[3]	55	!!----------------------------------------------------------------------
[9598]	56	!! NEMO/OCE 4.0 , NEMO Consortium (2018)
[888]	57	!! $Id$
[10068]	58	!! Software governed by the CeCILL license (see ./LICENSE)
[592]	59	!!----------------------------------------------------------------------
[3]	60	CONTAINS
	61
[12377]	62	SUBROUTINE ssh_nxt( kt, Kbb, Kmm, pssh, Kaa )
[3]	63	!!----------------------------------------------------------------------
[4292]	64	!! * ROUTINE ssh_nxt *
[1438]	65	!!
[12377]	66	!! ** Purpose : compute the after ssh (ssh(Kaa))
[3]	67	!!
[4292]	68	!! ** Method : - Using the incompressibility hypothesis, the ssh increment
	69	!! is computed by integrating the horizontal divergence and multiply by
	70	!! by the time step.
[3]	71	!!
[12377]	72	!! ** action : ssh(:,:,Kaa), after sea surface height
[2528]	73	!!
	74	!! Reference : Leclair, M., and G. Madec, 2009, Ocean Modelling.
[3]	75	!!----------------------------------------------------------------------
[12377]	76	INTEGER , INTENT(in ) :: kt ! time step
	77	INTEGER , INTENT(in ) :: Kbb, Kmm, Kaa ! time level index
	78	REAL(wp), DIMENSION(jpi,jpj,jpt), INTENT(inout) :: pssh ! sea-surface height
[4292]	79	!
[12489]	80	INTEGER :: jk ! dummy loop index
	81	REAL(wp) :: zcoef ! local scalar
[9019]	82	REAL(wp), DIMENSION(jpi,jpj) :: zhdiv ! 2D workspace
[3]	83	!!----------------------------------------------------------------------
[3294]	84	!
[9019]	85	IF( ln_timing ) CALL timing_start('ssh_nxt')
[3294]	86	!
[3]	87	IF( kt == nit000 ) THEN
	88	IF(lwp) WRITE(numout,*)
[4292]	89	IF(lwp) WRITE(numout,*) 'ssh_nxt : after sea surface height'
[1438]	90	IF(lwp) WRITE(numout,*) '~~~~~~~ '
[3]	91	ENDIF
[2528]	92	!
[12489]	93	zcoef = 0.5_wp * r1_rho0
[3]	94
[1438]	95	! !------------------------------!
	96	! ! After Sea Surface Height !
	97	! !------------------------------!
[9023]	98	IF(ln_wd_il) THEN
[12489]	99	CALL wad_lmt(pssh(:,:,Kbb), zcoef * (emp_b(:,:) + emp(:,:)), rDt, Kmm, uu, vv )
[7753]	100	ENDIF
[7646]	101
[12377]	102	CALL div_hor( kt, Kbb, Kmm ) ! Horizontal divergence
[7646]	103	!
[7753]	104	zhdiv(:,:) = 0._wp
[1438]	105	DO jk = 1, jpkm1 ! Horizontal divergence of barotropic transports
[12377]	106	zhdiv(:,:) = zhdiv(:,:) + e3t(:,:,jk,Kmm) * hdiv(:,:,jk)
[1438]	107	END DO
	108	! ! Sea surface elevation time stepping
[4338]	109	! In time-split case we need a first guess of the ssh after (using the baroclinic timestep) in order to
	110	! compute the vertical velocity which can be used to compute the non-linear terms of the momentum equations.
	111	!
[12489]	112	pssh(:,:,Kaa) = ( pssh(:,:,Kbb) - rDt * ( zcoef * ( emp_b(:,:) + emp(:,:) ) + zhdiv(:,:) ) ) * ssmask(:,:)
[9023]	113	!
	114	#if defined key_agrif
[13237]	115	Kbb_a = Kbb ; Kmm_a = Kmm ; Krhs_a = Kaa
	116	CALL agrif_ssh( kt )
[9023]	117	#endif
	118	!
[5930]	119	IF ( .NOT.ln_dynspg_ts ) THEN
[7646]	120	IF( ln_bdy ) THEN
[13226]	121	CALL lbc_lnk( 'sshwzv', pssh(:,:,Kaa), 'T', 1.0_wp ) ! Not sure that's necessary
[12377]	122	CALL bdy_ssh( pssh(:,:,Kaa) ) ! Duplicate sea level across open boundaries
[5930]	123	ENDIF
[4292]	124	ENDIF
	125	! !------------------------------!
	126	! ! outputs !
	127	! !------------------------------!
	128	!
[12377]	129	IF(sn_cfctl%l_prtctl) CALL prt_ctl( tab2d_1=pssh(:,:,Kaa), clinfo1=' pssh(:,:,Kaa) - : ', mask1=tmask )
[4292]	130	!
[9019]	131	IF( ln_timing ) CALL timing_stop('ssh_nxt')
[4292]	132	!
	133	END SUBROUTINE ssh_nxt
	134
	135
[13237]	136	SUBROUTINE wzv( kt, Kbb, Kmm, Kaa, pww )
[4292]	137	!!----------------------------------------------------------------------
	138	!! * ROUTINE wzv *
	139	!!
	140	!! ** Purpose : compute the now vertical velocity
	141	!!
	142	!! ** Method : - Using the incompressibility hypothesis, the vertical
	143	!! velocity is computed by integrating the horizontal divergence
	144	!! from the bottom to the surface minus the scale factor evolution.
	145	!! The boundary conditions are w=0 at the bottom (no flux) and.
	146	!!
[12377]	147	!! ** action : pww : now vertical velocity
[4292]	148	!!
	149	!! Reference : Leclair, M., and G. Madec, 2009, Ocean Modelling.
	150	!!----------------------------------------------------------------------
[12377]	151	INTEGER , INTENT(in) :: kt ! time step
	152	INTEGER , INTENT(in) :: Kbb, Kmm, Kaa ! time level indices
[13237]	153	REAL(wp), DIMENSION(jpi,jpj,jpk), INTENT(inout) :: pww ! vertical velocity at Kmm
[4292]	154	!
[5836]	155	INTEGER :: ji, jj, jk ! dummy loop indices
[9019]	156	REAL(wp), ALLOCATABLE, DIMENSION(:,:,:) :: zhdiv
[4292]	157	!!----------------------------------------------------------------------
	158	!
[9019]	159	IF( ln_timing ) CALL timing_start('wzv')
[5836]	160	!
[4292]	161	IF( kt == nit000 ) THEN
	162	IF(lwp) WRITE(numout,*)
	163	IF(lwp) WRITE(numout,*) 'wzv : now vertical velocity '
	164	IF(lwp) WRITE(numout,*) '~~~~~ '
	165	!
[12377]	166	pww(:,:,jpk) = 0._wp ! bottom boundary condition: w=0 (set once for all)
[4292]	167	ENDIF
	168	! !------------------------------!
	169	! ! Now Vertical Velocity !
	170	! !------------------------------!
	171	!
[13237]	172	! !===============================!
	173	IF( ln_vvl_ztilde .OR. ln_vvl_layer ) THEN !== z_tilde and layer cases ==!
	174	! !===============================!
[9019]	175	ALLOCATE( zhdiv(jpi,jpj,jpk) )
[4292]	176	!
	177	DO jk = 1, jpkm1
	178	! horizontal divergence of thickness diffusion transport ( velocity multiplied by e3t)
[4338]	179	! - ML - note: computation already done in dom_vvl_sf_nxt. Could be optimized (not critical and clearer this way)
[13295]	180	DO_2D( 0, 0, 0, 0 )
[12377]	181	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) )
	182	END_2D
[592]	183	END DO
[13226]	184	CALL lbc_lnk('sshwzv', zhdiv, 'T', 1.0_wp) ! - ML - Perhaps not necessary: not used for horizontal "connexions"
[4292]	185	! ! Is it problematic to have a wrong vertical velocity in boundary cells?
[12377]	186	! ! Same question holds for hdiv. Perhaps just for security
[4292]	187	DO jk = jpkm1, 1, -1 ! integrate from the bottom the hor. divergence
	188	! computation of w
[13237]	189	pww(:,:,jk) = pww(:,:,jk+1) - ( e3t(:,:,jk,Kmm) * hdiv(:,:,jk) &
	190	& + zhdiv(:,:,jk) &
	191	& + r1_Dt * ( e3t(:,:,jk,Kaa) &
	192	& - e3t(:,:,jk,Kbb) ) ) * tmask(:,:,jk)
[4292]	193	END DO
[12377]	194	! IF( ln_vvl_layer ) pww(:,:,:) = 0.e0
[9019]	195	DEALLOCATE( zhdiv )
[13237]	196	! !=================================!
	197	ELSEIF( ln_linssh ) THEN !== linear free surface cases ==!
	198	! !=================================!
	199	DO jk = jpkm1, 1, -1 ! integrate from the bottom the hor. divergence
	200	pww(:,:,jk) = pww(:,:,jk+1) - ( e3t(:,:,jk,Kmm) * hdiv(:,:,jk) ) * tmask(:,:,jk)
	201	END DO
	202	! !==========================================!
	203	ELSE !== Quasi-Eulerian vertical coordinate ==! ('key_qco')
	204	! !==========================================!
[13497]	205	DO jk = jpkm1, 1, -1 ! integrate from the bottom the hor. divergence
[12377]	206	pww(:,:,jk) = pww(:,:,jk+1) - ( e3t(:,:,jk,Kmm) * hdiv(:,:,jk) &
[13237]	207	& + r1_Dt * ( e3t(:,:,jk,Kaa) &
	208	& - e3t(:,:,jk,Kbb) ) ) * tmask(:,:,jk)
[4292]	209	END DO
[1438]	210	ENDIF
[592]	211
[7646]	212	IF( ln_bdy ) THEN
[4327]	213	DO jk = 1, jpkm1
[12377]	214	pww(:,:,jk) = pww(:,:,jk) * bdytmask(:,:)
[4327]	215	END DO
	216	ENDIF
[4292]	217	!
[13286]	218	#if defined key_agrif
	219	IF( .NOT. AGRIF_Root() ) THEN
	220	!
[12965]	221	! Mask vertical velocity at first/last columns/row
	222	! inside computational domain (cosmetic)
[13286]	223	DO jk = 1, jpkm1
	224	IF( lk_west ) THEN ! --- West --- !
	225	DO ji = mi0(2+nn_hls), mi1(2+nn_hls)
	226	DO jj = 1, jpj
	227	pww(ji,jj,jk) = 0._wp
	228	END DO
	229	END DO
	230	ENDIF
	231	IF( lk_east ) THEN ! --- East --- !
	232	DO ji = mi0(jpiglo-1-nn_hls), mi1(jpiglo-1-nn_hls)
	233	DO jj = 1, jpj
	234	pww(ji,jj,jk) = 0._wp
	235	END DO
	236	END DO
	237	ENDIF
	238	IF( lk_south ) THEN ! --- South --- !
	239	DO jj = mj0(2+nn_hls), mj1(2+nn_hls)
	240	DO ji = 1, jpi
	241	pww(ji,jj,jk) = 0._wp
	242	END DO
	243	END DO
	244	ENDIF
	245	IF( lk_north ) THEN ! --- North --- !
	246	DO jj = mj0(jpjglo-1-nn_hls), mj1(jpjglo-1-nn_hls)
	247	DO ji = 1, jpi
	248	pww(ji,jj,jk) = 0._wp
	249	END DO
	250	END DO
	251	ENDIF
	252	!
	253	END DO
[12965]	254	!
[9023]	255	ENDIF
[13286]	256	#endif
[5836]	257	!
[9124]	258	IF( ln_timing ) CALL timing_stop('wzv')
[9023]	259	!
[5836]	260	END SUBROUTINE wzv
[592]	261
	262
[14205]	263	SUBROUTINE ssh_atf( kt, Kbb, Kmm, Kaa, pssh )
[1438]	264	!!----------------------------------------------------------------------
[12377]	265	!! * ROUTINE ssh_atf *
[1438]	266	!!
[12377]	267	!! ** Purpose : Apply Asselin time filter to now SSH.
[1438]	268	!!
[2528]	269	!! ** Method : - apply Asselin time fiter to now ssh (excluding the forcing
	270	!! from the filter, see Leclair and Madec 2010) and swap :
[12489]	271	!! pssh(:,:,Kmm) = pssh(:,:,Kaa) + rn_atfp * ( pssh(:,:,Kbb) -2 pssh(:,:,Kmm) + pssh(:,:,Kaa) )
	272	!! - rn_atfp * rn_Dt * ( emp_b - emp ) / rho0
[1438]	273	!!
[12377]	274	!! ** action : - pssh(:,:,Kmm) time filtered
[2528]	275	!!
	276	!! Reference : Leclair, M., and G. Madec, 2009, Ocean Modelling.
[1438]	277	!!----------------------------------------------------------------------
[12377]	278	INTEGER , INTENT(in ) :: kt ! ocean time-step index
	279	INTEGER , INTENT(in ) :: Kbb, Kmm, Kaa ! ocean time level indices
[14205]	280	REAL(wp), DIMENSION(jpi,jpj,jpt), INTENT(inout) :: pssh ! SSH field
[6140]	281	!
	282	REAL(wp) :: zcoef ! local scalar
[1438]	283	!!----------------------------------------------------------------------
[3294]	284	!
[12377]	285	IF( ln_timing ) CALL timing_start('ssh_atf')
[3294]	286	!
[1438]	287	IF( kt == nit000 ) THEN
	288	IF(lwp) WRITE(numout,*)
[12377]	289	IF(lwp) WRITE(numout,*) 'ssh_atf : Asselin time filter of sea surface height'
[1438]	290	IF(lwp) WRITE(numout,*) '~~~~~~~ '
	291	ENDIF
[14205]	292	!
	293	IF( .NOT.l_1st_euler ) THEN ! Apply Asselin time filter on Kmm field (not on euler 1st)
[14053]	294	!
[14205]	295	IF( ln_linssh ) THEN ! filtered "now" field
	296	pssh(:,:,Kmm) = pssh(:,:,Kmm) + rn_atfp * ( pssh(:,:,Kbb) - 2 * pssh(:,:,Kmm) + pssh(:,:,Kaa) )
	297	!
	298	ELSE ! filtered "now" field with forcing removed
[12489]	299	zcoef = rn_atfp * rn_Dt * r1_rho0
[14205]	300	pssh(:,:,Kmm) = pssh(:,:,Kmm) + rn_atfp * ( pssh(:,:,Kbb) - 2 * pssh(:,:,Kmm) + pssh(:,:,Kaa) ) &
	301	& - zcoef * ( emp_b(:,:) - emp(:,:) &
	302	& - rnf_b(:,:) + rnf(:,:) &
	303	& + fwfisf_cav_b(:,:) - fwfisf_cav(:,:) &
	304	& + fwfisf_par_b(:,:) - fwfisf_par(:,:) ) * ssmask(:,:)
[12377]	305
	306	! ice sheet coupling
[14053]	307	IF( ln_isf .AND. ln_isfcpl .AND. kt == nit000+1 ) &
[14205]	308	& pssh(:,:,Kbb) = pssh(:,:,Kbb) - rn_atfp * rn_Dt * ( risfcpl_ssh(:,:) - 0._wp ) * ssmask(:,:)
[12377]	309
[6140]	310	ENDIF
[1438]	311	ENDIF
	312	!
[14053]	313	IF(sn_cfctl%l_prtctl) CALL prt_ctl( tab2d_1=pssh(:,:,Kmm), clinfo1=' atf - pssh(:,:,Kmm): ', mask1=tmask )
[2528]	314	!
[12377]	315	IF( ln_timing ) CALL timing_stop('ssh_atf')
[3294]	316	!
[12377]	317	END SUBROUTINE ssh_atf
[3]	318
[13237]	319
[12377]	320	SUBROUTINE wAimp( kt, Kmm )
[10364]	321	!!----------------------------------------------------------------------
	322	!! * ROUTINE wAimp *
	323	!!
	324	!! ** Purpose : compute the Courant number and partition vertical velocity
	325	!! if a proportion needs to be treated implicitly
	326	!!
	327	!! ** Method : -
	328	!!
[12377]	329	!! ** action : ww : now vertical velocity (to be handled explicitly)
[10364]	330	!! : wi : now vertical velocity (for implicit treatment)
	331	!!
[11414]	332	!! Reference : Shchepetkin, A. F. (2015): An adaptive, Courant-number-dependent
	333	!! implicit scheme for vertical advection in oceanic modeling.
	334	!! Ocean Modelling, 91, 38-69.
[10364]	335	!!----------------------------------------------------------------------
	336	INTEGER, INTENT(in) :: kt ! time step
[12377]	337	INTEGER, INTENT(in) :: Kmm ! time level index
[10364]	338	!
	339	INTEGER :: ji, jj, jk ! dummy loop indices
[13237]	340	REAL(wp) :: zCu, zcff, z1_e3t, zdt ! local scalars
[10364]	341	REAL(wp) , PARAMETER :: Cu_min = 0.15_wp ! local parameters
[11407]	342	REAL(wp) , PARAMETER :: Cu_max = 0.30_wp ! local parameters
[10364]	343	REAL(wp) , PARAMETER :: Cu_cut = 2._wp*Cu_max - Cu_min ! local parameters
	344	REAL(wp) , PARAMETER :: Fcu = 4._wpCu_max(Cu_max-Cu_min) ! local parameters
	345	!!----------------------------------------------------------------------
	346	!
	347	IF( ln_timing ) CALL timing_start('wAimp')
	348	!
	349	IF( kt == nit000 ) THEN
	350	IF(lwp) WRITE(numout,*)
	351	IF(lwp) WRITE(numout,*) 'wAimp : Courant number-based partitioning of now vertical velocity '
	352	IF(lwp) WRITE(numout,*) '~~~~~ '
[11293]	353	wi(:,:,:) = 0._wp
[10364]	354	ENDIF
	355	!
[11414]	356	! Calculate Courant numbers
[13237]	357	zdt = 2._wp * rn_Dt ! 2*rn_Dt and not rDt (for restartability)
[11414]	358	IF( ln_vvl_ztilde .OR. ln_vvl_layer ) THEN
[13295]	359	DO_3D( 0, 0, 0, 0, 1, jpkm1 )
[12377]	360	z1_e3t = 1._wp / e3t(ji,jj,jk,Kmm)
[13237]	361	Cu_adv(ji,jj,jk) = zdt * &
	362	& ( ( MAX( ww(ji,jj,jk) , 0._wp ) - MIN( ww(ji,jj,jk+1) , 0._wp ) ) &
	363	& + ( MAX( e2u(ji ,jj) * e3u(ji ,jj,jk,Kmm) &
	364	& * uu (ji ,jj,jk,Kmm) + un_td(ji ,jj,jk), 0._wp ) - &
	365	& MIN( e2u(ji-1,jj) * e3u(ji-1,jj,jk,Kmm) &
	366	& * uu (ji-1,jj,jk,Kmm) + un_td(ji-1,jj,jk), 0._wp ) ) &
[12377]	367	& * r1_e1e2t(ji,jj) &
[13237]	368	& + ( MAX( e1v(ji,jj ) * e3v(ji,jj ,jk,Kmm) &
	369	& * vv (ji,jj ,jk,Kmm) + vn_td(ji,jj ,jk), 0._wp ) - &
	370	& MIN( e1v(ji,jj-1) * e3v(ji,jj-1,jk,Kmm) &
	371	& * vv (ji,jj-1,jk,Kmm) + vn_td(ji,jj-1,jk), 0._wp ) ) &
[12377]	372	& * r1_e1e2t(ji,jj) &
	373	& ) * z1_e3t
	374	END_3D
[11414]	375	ELSE
[13295]	376	DO_3D( 0, 0, 0, 0, 1, jpkm1 )
[12377]	377	z1_e3t = 1._wp / e3t(ji,jj,jk,Kmm)
[13237]	378	Cu_adv(ji,jj,jk) = zdt * &
	379	& ( ( MAX( ww(ji,jj,jk) , 0._wp ) - MIN( ww(ji,jj,jk+1) , 0._wp ) ) &
[12377]	380	& + ( MAX( e2u(ji ,jj)e3u(ji ,jj,jk,Kmm)uu(ji ,jj,jk,Kmm), 0._wp ) - &
	381	& MIN( e2u(ji-1,jj)e3u(ji-1,jj,jk,Kmm)uu(ji-1,jj,jk,Kmm), 0._wp ) ) &
	382	& * r1_e1e2t(ji,jj) &
	383	& + ( MAX( e1v(ji,jj )e3v(ji,jj ,jk,Kmm)vv(ji,jj ,jk,Kmm), 0._wp ) - &
	384	& MIN( e1v(ji,jj-1)e3v(ji,jj-1,jk,Kmm)vv(ji,jj-1,jk,Kmm), 0._wp ) ) &
	385	& * r1_e1e2t(ji,jj) &
	386	& ) * z1_e3t
	387	END_3D
[11414]	388	ENDIF
[13226]	389	CALL lbc_lnk( 'sshwzv', Cu_adv, 'T', 1.0_wp )
[10364]	390	!
	391	CALL iom_put("Courant",Cu_adv)
	392	!
	393	IF( MAXVAL( Cu_adv(:,:,:) ) > Cu_min ) THEN ! Quick check if any breaches anywhere
[13497]	394	DO_3DS( 1, 1, 1, 1, jpkm1, 2, -1 ) ! or scan Courant criterion and partition ! w where necessary
[12377]	395	!
	396	zCu = MAX( Cu_adv(ji,jj,jk) , Cu_adv(ji,jj,jk-1) )
[11293]	397	! alt:
[12377]	398	! IF ( ww(ji,jj,jk) > 0._wp ) THEN
[11293]	399	! zCu = Cu_adv(ji,jj,jk)
	400	! ELSE
	401	! zCu = Cu_adv(ji,jj,jk-1)
	402	! ENDIF
[12377]	403	!
	404	IF( zCu <= Cu_min ) THEN !<-- Fully explicit
	405	zcff = 0._wp
	406	ELSEIF( zCu < Cu_cut ) THEN !<-- Mixed explicit
	407	zcff = ( zCu - Cu_min )**2
	408	zcff = zcff / ( Fcu + zcff )
	409	ELSE !<-- Mostly implicit
	410	zcff = ( zCu - Cu_max )/ zCu
	411	ENDIF
	412	zcff = MIN(1._wp, zcff)
	413	!
	414	wi(ji,jj,jk) = zcff * ww(ji,jj,jk)
	415	ww(ji,jj,jk) = ( 1._wp - zcff ) * ww(ji,jj,jk)
	416	!
	417	Cu_adv(ji,jj,jk) = zcff ! Reuse array to output coefficient below and in stp_ctl
	418	END_3D
[11293]	419	Cu_adv(:,:,1) = 0._wp
[10364]	420	ELSE
	421	! Fully explicit everywhere
[11407]	422	Cu_adv(:,:,:) = 0._wp ! Reuse array to output coefficient below and in stp_ctl
[10907]	423	wi (:,:,:) = 0._wp
[10364]	424	ENDIF
	425	CALL iom_put("wimp",wi)
	426	CALL iom_put("wi_cff",Cu_adv)
[12377]	427	CALL iom_put("wexp",ww)
[10364]	428	!
	429	IF( ln_timing ) CALL timing_stop('wAimp')
	430	!
	431	END SUBROUTINE wAimp
[14053]	432
[3]	433	!!======================================================================
[1565]	434	END MODULE sshwzv

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