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sshwzv.F90 in branches/2011/DEV_r2739_STFC_dCSE/NEMOGCM/NEMO/OPA_SRC/DYN – NEMO

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source: branches/2011/DEV_r2739_STFC_dCSE/NEMOGCM/NEMO/OPA_SRC/DYN/sshwzv.F90 @ 4438

Last change on this file since 4438 was 4438, checked in by trackstand2, 10 years ago
Protect debug SUM output in dynnxt and sshwzv with ARPDBGSUM
Property svn:keywords set to `Id`
File size: 25.6 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
[3]	10	!!----------------------------------------------------------------------
[1438]	11
[3]	12	!!----------------------------------------------------------------------
[1438]	13	!! ssh_wzv : after ssh & now vertical velocity
	14	!! ssh_nxt : filter ans swap the ssh arrays
	15	!!----------------------------------------------------------------------
[3]	16	USE oce ! ocean dynamics and tracers variables
	17	USE dom_oce ! ocean space and time domain variables
[888]	18	USE sbc_oce ! surface boundary condition: ocean
	19	USE domvvl ! Variable volume
[1565]	20	USE divcur ! hor. divergence and curl (div & cur routines)
[1438]	21	USE iom ! I/O library
	22	USE restart ! only for lrst_oce
[3]	23	USE in_out_manager ! I/O manager
[258]	24	USE prtctl ! Print control
[592]	25	USE phycst
	26	USE lbclnk ! ocean lateral boundary condition (or mpp link)
[2715]	27	USE lib_mpp ! MPP library
[1241]	28	USE obc_par ! open boundary cond. parameter
	29	USE obc_oce
[2528]	30	USE bdy_oce
[2715]	31	USE diaar5, ONLY: lk_diaar5
[1482]	32	USE iom
[2715]	33	USE sbcrnf, ONLY: h_rnf, nk_rnf ! River runoff
[2528]	34	#if defined key_agrif
	35	USE agrif_opa_update
[2486]	36	USE agrif_opa_interp
[2528]	37	#endif
	38	#if defined key_asminc
	39	USE asminc ! Assimilation increment
	40	#endif
[592]	41
[3]	42	IMPLICIT NONE
	43	PRIVATE
	44
[1438]	45	PUBLIC ssh_wzv ! called by step.F90
	46	PUBLIC ssh_nxt ! called by step.F90
[3]	47
[3211]	48	!! * Control permutation of array indices
	49	# include "oce_ftrans.h90"
	50	# include "dom_oce_ftrans.h90"
	51	# include "sbc_oce_ftrans.h90"
	52	# include "domvvl_ftrans.h90"
	53	# include "obc_oce_ftrans.h90"
	54	#if defined key_asminc
	55	# include "asminc_ftrans.h90"
	56	#endif
	57
[3]	58	!! * Substitutions
	59	# include "domzgr_substitute.h90"
[1438]	60	# include "vectopt_loop_substitute.h90"
[3]	61	!!----------------------------------------------------------------------
[2528]	62	!! NEMO/OPA 3.3 , NEMO Consortium (2010)
[888]	63	!! $Id$
[2715]	64	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[592]	65	!!----------------------------------------------------------------------
[3]	66	CONTAINS
	67
[1438]	68	SUBROUTINE ssh_wzv( kt )
[3]	69	!!----------------------------------------------------------------------
[1438]	70	!! * ROUTINE ssh_wzv *
	71	!!
	72	!! ** Purpose : compute the after ssh (ssha), the now vertical velocity
	73	!! and update the now vertical coordinate (lk_vvl=T).
[3]	74	!!
[2528]	75	!! ** Method : - Using the incompressibility hypothesis, the vertical
[1438]	76	!! velocity is computed by integrating the horizontal divergence
	77	!! from the bottom to the surface minus the scale factor evolution.
	78	!! The boundary conditions are w=0 at the bottom (no flux) and.
[3]	79	!!
[1438]	80	!! ** action : ssha : after sea surface height
	81	!! wn : now vertical velocity
[2528]	82	!! sshu_a, sshv_a, sshf_a : after sea surface height (lk_vvl=T)
	83	!! hu, hv, hur, hvr : ocean depth and its inverse at u-,v-points
	84	!!
	85	!! Reference : Leclair, M., and G. Madec, 2009, Ocean Modelling.
[3]	86	!!----------------------------------------------------------------------
[2715]	87	USE wrk_nemo, ONLY: wrk_in_use, wrk_not_released
	88	USE oce , ONLY: z3d => ta ! ta used as 3D workspace
	89	USE wrk_nemo, ONLY: zhdiv => wrk_2d_1 , z2d => wrk_2d_2 ! 2D workspace
[3211]	90	!! DCSE_NEMO: need additional directives for renamed module variables
	91	!FTRANS z3d :I :I :z
[2715]	92	!
[1438]	93	INTEGER, INTENT(in) :: kt ! time step
[2715]	94	!
	95	INTEGER :: ji, jj, jk ! dummy loop indices
[4427]	96	#if defined key_z_first
	97	INTEGER :: klim ! upper bound on k loop
	98	#endif
[2715]	99	REAL(wp) :: zcoefu, zcoefv, zcoeff, z2dt, z1_2dt, z1_rau0 ! local scalars
[3]	100	!!----------------------------------------------------------------------
	101
[2715]	102	IF( wrk_in_use(2, 1,2) ) THEN
	103	CALL ctl_stop('ssh_wzv: requested workspace arrays unavailable') ; RETURN
	104	ENDIF
	105
[3]	106	IF( kt == nit000 ) THEN
[2528]	107	!
[3]	108	IF(lwp) WRITE(numout,*)
[1438]	109	IF(lwp) WRITE(numout,*) 'ssh_wzv : after sea surface height and now vertical velocity '
	110	IF(lwp) WRITE(numout,*) '~~~~~~~ '
	111	!
[4427]	112	#if defined key_z_first
	113	DO jj=1,jpj
	114	DO ji=1,jpi
	115	DO jk=mbkmax(ji,jj), jpk
	116	wn(ji,jj,jk) = 0._wp
	117	END DO
	118	END DO
	119	END DO
	120	#else
[2715]	121	wn(:,:,jpk) = 0._wp ! bottom boundary condition: w=0 (set once for all)
[4427]	122	#endif
[1438]	123	!
	124	IF( lk_vvl ) THEN ! before and now Sea SSH at u-, v-, f-points (vvl case only)
	125	DO jj = 1, jpjm1
	126	DO ji = 1, jpim1 ! caution: use of Vector Opt. not possible
[3211]	127	#if defined key_z_first
	128	zcoefu = 0.5 * umask_1(ji,jj) / ( e1u(ji,jj) * e2u(ji,jj) )
	129	zcoefv = 0.5 * vmask_1(ji,jj) / ( e1v(ji,jj) * e2v(ji,jj) )
	130	zcoeff = 0.25 * umask_1(ji,jj) * umask_1(ji,jj+1)
	131	#else
[1438]	132	zcoefu = 0.5 * umask(ji,jj,1) / ( e1u(ji,jj) * e2u(ji,jj) )
	133	zcoefv = 0.5 * vmask(ji,jj,1) / ( e1v(ji,jj) * e2v(ji,jj) )
	134	zcoeff = 0.25 * umask(ji,jj,1) * umask(ji,jj+1,1)
[3211]	135	#endif
[1438]	136	sshu_b(ji,jj) = zcoefu * ( e1t(ji ,jj) * e2t(ji ,jj) * sshb(ji ,jj) &
	137	& + e1t(ji+1,jj) * e2t(ji+1,jj) * sshb(ji+1,jj) )
	138	sshv_b(ji,jj) = zcoefv * ( e1t(ji,jj ) * e2t(ji,jj ) * sshb(ji,jj ) &
	139	& + e1t(ji,jj+1) * e2t(ji,jj+1) * sshb(ji,jj+1) )
	140	sshu_n(ji,jj) = zcoefu * ( e1t(ji ,jj) * e2t(ji ,jj) * sshn(ji ,jj) &
	141	& + e1t(ji+1,jj) * e2t(ji+1,jj) * sshn(ji+1,jj) )
	142	sshv_n(ji,jj) = zcoefv * ( e1t(ji,jj ) * e2t(ji,jj ) * sshn(ji,jj ) &
	143	& + e1t(ji,jj+1) * e2t(ji,jj+1) * sshn(ji,jj+1) )
	144	END DO
	145	END DO
	146	CALL lbc_lnk( sshu_b, 'U', 1. ) ; CALL lbc_lnk( sshu_n, 'U', 1. )
	147	CALL lbc_lnk( sshv_b, 'V', 1. ) ; CALL lbc_lnk( sshv_n, 'V', 1. )
[2528]	148	DO jj = 1, jpjm1
	149	DO ji = 1, jpim1 ! NO Vector Opt.
[3211]	150	#if defined key_z_first
	151	sshf_n(ji,jj) = 0.5 * umask_1(ji,jj) * umask_1(ji,jj+1) &
	152	& / ( e1f(ji,jj ) * e2f(ji,jj ) ) &
	153	& * ( e1u(ji,jj ) * e2u(ji,jj ) * sshu_n(ji,jj ) &
	154	& + e1u(ji,jj+1) * e2u(ji,jj+1) * sshu_n(ji,jj+1) )
	155	#else
[2528]	156	sshf_n(ji,jj) = 0.5 * umask(ji,jj,1) * umask(ji,jj+1,1) &
	157	& / ( e1f(ji,jj ) * e2f(ji,jj ) ) &
	158	& * ( e1u(ji,jj ) * e2u(ji,jj ) * sshu_n(ji,jj ) &
	159	& + e1u(ji,jj+1) * e2u(ji,jj+1) * sshu_n(ji,jj+1) )
[3211]	160	#endif
[2528]	161	END DO
	162	END DO
	163	CALL lbc_lnk( sshf_n, 'F', 1. )
[1438]	164	ENDIF
	165	!
[3]	166	ENDIF
	167
[2528]	168	! !------------------------------------------!
	169	IF( lk_vvl ) THEN ! Regridding: Update Now Vertical coord. ! (only in vvl case)
	170	! !------------------------------------------!
[3211]	171	#if defined key_z_first
[3432]	172	! DCSE_NEMO: can't use implicit loop over k here because the domzgr_substitute.h90
	173	! file causes the line below to be expanded to:
	174	! gdept_1(1:jpkm1,:,:) = (gdept(1:jpkm1,:,:)(1.+sshn(:,:)mut(1:jpkm1,:,:)))
	175	! which contains non-conforming array expressions.
[4427]	176	DO jj=1,jpj
	177	DO ji=1,jpi
	178	klim=mbkmax(ji,jj)
	179	! now local depths stored in fsdep. arrays
	180	fsdept(ji,jj,1:klim) = fsdept_n(ji,jj,1:klim)
	181	fsdepw(ji,jj,1:klim) = fsdepw_n(ji,jj,1:klim)
	182	fsde3w(ji,jj,1:klim) = fsde3w_n(ji,jj,1:klim)
	183	! vertical scale factors stored in fse3. arrays
	184	fse3t (ji,jj,1:klim) = fse3t_n (ji,jj,1:klim)
	185	fse3u (ji,jj,1:klim) = fse3u_n (ji,jj,1:klim)
	186	fse3v (ji,jj,1:klim) = fse3v_n (ji,jj,1:klim)
	187	fse3f (ji,jj,1:klim) = fse3f_n (ji,jj,1:klim)
	188	fse3w (ji,jj,1:klim) = fse3w_n (ji,jj,1:klim)
	189	fse3uw(ji,jj,1:klim) = fse3uw_n(ji,jj,1:klim)
	190	fse3vw(ji,jj,1:klim) = fse3vw_n(ji,jj,1:klim)
[3432]	191	END DO
	192	END DO
[3211]	193	#else
[1565]	194	DO jk = 1, jpkm1
[2528]	195	fsdept(:,:,jk) = fsdept_n(:,:,jk) ! now local depths stored in fsdep. arrays
[1565]	196	fsdepw(:,:,jk) = fsdepw_n(:,:,jk)
	197	fsde3w(:,:,jk) = fsde3w_n(:,:,jk)
	198	!
[2528]	199	fse3t (:,:,jk) = fse3t_n (:,:,jk) ! vertical scale factors stored in fse3. arrays
[1565]	200	fse3u (:,:,jk) = fse3u_n (:,:,jk)
	201	fse3v (:,:,jk) = fse3v_n (:,:,jk)
	202	fse3f (:,:,jk) = fse3f_n (:,:,jk)
	203	fse3w (:,:,jk) = fse3w_n (:,:,jk)
	204	fse3uw(:,:,jk) = fse3uw_n(:,:,jk)
	205	fse3vw(:,:,jk) = fse3vw_n(:,:,jk)
	206	END DO
[3211]	207	#endif
[2528]	208	!
	209	hu(:,:) = hu_0(:,:) + sshu_n(:,:) ! now ocean depth (at u- and v-points)
[1565]	210	hv(:,:) = hv_0(:,:) + sshv_n(:,:)
[2528]	211	! ! now masked inverse of the ocean depth (at u- and v-points)
[3211]	212	#if defined key_z_first
	213	hur(:,:) = umask_1(:,:) / ( hu(:,:) + 1._wp - umask_1(:,:) )
	214	hvr(:,:) = vmask_1(:,:) / ( hv(:,:) + 1._wp - vmask_1(:,:) )
	215	#else
[2715]	216	hur(:,:) = umask(:,:,1) / ( hu(:,:) + 1._wp - umask(:,:,1) )
	217	hvr(:,:) = vmask(:,:,1) / ( hv(:,:) + 1._wp - vmask(:,:,1) )
[3211]	218	#endif
[2528]	219	!
[1565]	220	ENDIF
[2528]	221	!
	222	CALL div_cur( kt ) ! Horizontal divergence & Relative vorticity
	223	!
[2715]	224	z2dt = 2._wp * rdt ! set time step size (Euler/Leapfrog)
	225	IF( neuler == 0 .AND. kt == nit000 ) z2dt = rdt
[3]	226
[4438]	227	#if defined ARPDBGSUM
[4415]	228	WRITE(,)'ARPDBG, ssh_wzv: sum WWW of hdivn=',SUM(hdivn),' at step=',kt
	229	WRITE(,)'ARPDBG, ssh_wzv: sum WWW of fse3t=',SUM(fse3t(:,:,:)),' at step=',kt
[4438]	230	#endif
[1438]	231	! !------------------------------!
	232	! ! After Sea Surface Height !
	233	! !------------------------------!
[2715]	234	zhdiv(:,:) = 0._wp
[3211]	235	#if defined key_z_first
	236	DO jj = 1, jpj
	237	DO ji = 1, jpi
[4427]	238	DO jk = 1, mbkmax(ji,jj)-1 ! Horizontal divergence of barotropic transports
[3211]	239	zhdiv(ji,jj) = zhdiv(ji,jj) + fse3t(ji,jj,jk) * hdivn(ji,jj,jk)
	240	END DO
	241	END DO
	242	END DO
	243	#else
[1438]	244	DO jk = 1, jpkm1 ! Horizontal divergence of barotropic transports
	245	zhdiv(:,:) = zhdiv(:,:) + fse3t(:,:,jk) * hdivn(:,:,jk)
	246	END DO
[3211]	247	#endif
[4438]	248
	249	#if defined ARPDBGSUM
[4415]	250	WRITE(,)'ARPDBG, ssh_wzv: sum XXX of zhdiv=',SUM(zhdiv),' at step=',kt
	251	WRITE(,)'ARPDBG, ssh_wzv: sum XXX of ssha=',SUM(ssha),' at step=',kt
[4438]	252	#endif
[1438]	253	! ! Sea surface elevation time stepping
[2528]	254	! In forward Euler time stepping case, the same formulation as in the leap-frog case can be used
	255	! because emp_b field is initialized with the vlaues of emp field. Hence, 0.5 * ( emp + emp_b ) = emp
	256	z1_rau0 = 0.5 / rau0
[3211]	257	#if defined key_z_first
	258	ssha(:,:) = ( sshb(:,:) - z2dt * ( z1_rau0 * ( emp_b(:,:) + emp(:,:) ) + zhdiv(:,:) ) ) * tmask_1(:,:)
	259	#else
[2715]	260	ssha(:,:) = ( sshb(:,:) - z2dt * ( z1_rau0 * ( emp_b(:,:) + emp(:,:) ) + zhdiv(:,:) ) ) * tmask(:,:,1)
[3211]	261	#endif
[4438]	262
	263	#if defined ARPDBGSUM
[4415]	264	WRITE(,)'ARPDBG, ssh_wzv: sum YYY of sshb=',SUM(sshb),' at step=',kt
	265	WRITE(,)'ARPDBG, ssh_wzv: sum YYY of ssha=',SUM(ssha),' at step=',kt
[4438]	266	#endif
	267
[2486]	268	#if defined key_agrif
[2715]	269	CALL agrif_ssh( kt )
[2486]	270	#endif
[1438]	271	#if defined key_obc
[2528]	272	IF( Agrif_Root() ) THEN
[1438]	273	ssha(:,:) = ssha(:,:) * obctmsk(:,:)
[2715]	274	CALL lbc_lnk( ssha, 'T', 1. ) ! absolutly compulsory !! (jmm)
[1438]	275	ENDIF
	276	#endif
[2528]	277	#if defined key_bdy
	278	ssha(:,:) = ssha(:,:) * bdytmask(:,:)
	279	CALL lbc_lnk( ssha, 'T', 1. )
	280	#endif
[1438]	281
	282	! ! Sea Surface Height at u-,v- and f-points (vvl case only)
	283	IF( lk_vvl ) THEN ! (required only in key_vvl case)
	284	DO jj = 1, jpjm1
[1694]	285	DO ji = 1, jpim1 ! NO Vector Opt.
[3211]	286	#if defined key_z_first
	287	sshu_a(ji,jj) = 0.5 * umask_1(ji,jj) / ( e1u(ji ,jj) * e2u(ji ,jj) ) &
	288	& * ( e1t(ji ,jj) * e2t(ji ,jj) * ssha(ji ,jj) &
	289	& + e1t(ji+1,jj) * e2t(ji+1,jj) * ssha(ji+1,jj) )
	290	sshv_a(ji,jj) = 0.5 * vmask_1(ji,jj) / ( e1v(ji,jj ) * e2v(ji,jj ) ) &
	291	& * ( e1t(ji,jj ) * e2t(ji,jj ) * ssha(ji,jj ) &
	292	& + e1t(ji,jj+1) * e2t(ji,jj+1) * ssha(ji,jj+1) )
	293	#else
[1438]	294	sshu_a(ji,jj) = 0.5 * umask(ji,jj,1) / ( e1u(ji ,jj) * e2u(ji ,jj) ) &
	295	& * ( e1t(ji ,jj) * e2t(ji ,jj) * ssha(ji ,jj) &
	296	& + e1t(ji+1,jj) * e2t(ji+1,jj) * ssha(ji+1,jj) )
	297	sshv_a(ji,jj) = 0.5 * vmask(ji,jj,1) / ( e1v(ji,jj ) * e2v(ji,jj ) ) &
	298	& * ( e1t(ji,jj ) * e2t(ji,jj ) * ssha(ji,jj ) &
	299	& + e1t(ji,jj+1) * e2t(ji,jj+1) * ssha(ji,jj+1) )
[3211]	300	#endif
[592]	301	END DO
	302	END DO
[2715]	303	CALL lbc_lnk( sshu_a, 'U', 1. ) ; CALL lbc_lnk( sshv_a, 'V', 1. ) ! Boundaries conditions
[1438]	304	ENDIF
[2715]	305
[2528]	306	#if defined key_asminc
[2715]	307	! ! Include the IAU weighted SSH increment
	308	IF( lk_asminc .AND. ln_sshinc .AND. ln_asmiau ) THEN
[2528]	309	CALL ssh_asm_inc( kt )
	310	ssha(:,:) = ssha(:,:) + z2dt * ssh_iau(:,:)
	311	ENDIF
	312	#endif
[592]	313
[1438]	314	! !------------------------------!
	315	! ! Now Vertical Velocity !
	316	! !------------------------------!
[2528]	317	z1_2dt = 1.e0 / z2dt
[3211]	318	#if defined key_z_first
	319	DO jj = 1, jpj
	320	DO ji = 1, jpi
[4427]	321	DO jk = mbkmax(ji,jj)-1, 1, -1 ! integrate from the bottom the hor. divergence
[3211]	322	wn(ji,jj,jk) = wn(ji,jj,jk+1) &
	323	& - fse3t_n(ji,jj,jk) * hdivn(ji,jj,jk) &
	324	& - ( fse3t_a(ji,jj,jk) - fse3t_b(ji,jj,jk) ) &
	325	& * tmask(ji,jj,jk) * z1_2dt
	326	#if defined key_bdy
	327	wn(ji,jj,jk) = wn(ji,jj,jk) * bdytmask(ji,jj)
	328	#endif
	329	END DO
	330	END DO
	331	END DO
	332	#else
[2528]	333	DO jk = jpkm1, 1, -1 ! integrate from the bottom the hor. divergence
	334	! - ML - need 3 lines here because replacement of fse3t by its expression yields too long lines otherwise
[2715]	335	wn(:,:,jk) = wn(:,:,jk+1) - fse3t_n(:,:,jk) * hdivn(:,:,jk) &
	336	& - ( fse3t_a(:,:,jk) - fse3t_b(:,:,jk) ) &
[2528]	337	& * tmask(:,:,jk) * z1_2dt
	338	#if defined key_bdy
	339	wn(:,:,jk) = wn(:,:,jk) * bdytmask(:,:)
	340	#endif
[1438]	341	END DO
[3211]	342	#endif
[2528]	343
	344	! !------------------------------!
	345	! ! outputs !
	346	! !------------------------------!
[1756]	347	CALL iom_put( "woce", wn ) ! vertical velocity
	348	CALL iom_put( "ssh" , sshn ) ! sea surface height
	349	CALL iom_put( "ssh2", sshn(:,:) * sshn(:,:) ) ! square of sea surface height
[2528]	350	IF( lk_diaar5 ) THEN ! vertical mass transport & its square value
	351	! Caution: in the VVL case, it only correponds to the baroclinic mass transport.
[1756]	352	z2d(:,:) = rau0 * e1t(:,:) * e2t(:,:)
[3211]	353	#if defined key_z_first
	354	DO jj = 1, jpj
	355	DO ji = 1, jpi
[4427]	356	DO jk = 1, mbkmax(ji,jj)
[3211]	357	z3d(ji,jj,jk) = wn(ji,jj,jk) * z2d(ji,jj)
	358	END DO
	359	END DO
	360	END DO
	361	#else
[1756]	362	DO jk = 1, jpk
	363	z3d(:,:,jk) = wn(:,:,jk) * z2d(:,:)
	364	END DO
[3211]	365	#endif
[2528]	366	CALL iom_put( "w_masstr" , z3d )
	367	CALL iom_put( "w_masstr2", z3d(:,:,:) * z3d(:,:,:) )
[1756]	368	ENDIF
[1438]	369	!
[2528]	370	IF(ln_ctl) CALL prt_ctl( tab2d_1=ssha, clinfo1=' ssha - : ', mask1=tmask, ovlap=1 )
	371	!
[2715]	372	IF( wrk_not_released(2, 1,2) ) CALL ctl_stop('ssh_wzv: failed to release workspace arrays')
	373	!
[1438]	374	END SUBROUTINE ssh_wzv
[592]	375
	376
[1438]	377	SUBROUTINE ssh_nxt( kt )
	378	!!----------------------------------------------------------------------
	379	!! * ROUTINE ssh_nxt *
	380	!!
	381	!! ** Purpose : achieve the sea surface height time stepping by
	382	!! applying Asselin time filter and swapping the arrays
	383	!! ssha already computed in ssh_wzv
	384	!!
[2528]	385	!! ** Method : - apply Asselin time fiter to now ssh (excluding the forcing
	386	!! from the filter, see Leclair and Madec 2010) and swap :
	387	!! sshn = ssha + atfp * ( sshb -2 sshn + ssha )
	388	!! - atfp * rdt * ( emp_b - emp ) / rau0
	389	!! sshn = ssha
[1438]	390	!!
	391	!! ** action : - sshb, sshn : before & now sea surface height
	392	!! ready for the next time step
[2528]	393	!!
	394	!! Reference : Leclair, M., and G. Madec, 2009, Ocean Modelling.
[1438]	395	!!----------------------------------------------------------------------
[2528]	396	INTEGER, INTENT(in) :: kt ! ocean time-step index
[1438]	397	!!
[2528]	398	INTEGER :: ji, jj ! dummy loop indices
	399	REAL(wp) :: zec ! temporary scalar
[1438]	400	!!----------------------------------------------------------------------
[592]	401
[1438]	402	IF( kt == nit000 ) THEN
	403	IF(lwp) WRITE(numout,*)
	404	IF(lwp) WRITE(numout,*) 'ssh_nxt : next sea surface height (Asselin time filter + swap)'
	405	IF(lwp) WRITE(numout,*) '~~~~~~~ '
	406	ENDIF
[592]	407
[2528]	408	! !--------------------------!
[2715]	409	IF( lk_vvl ) THEN ! Variable volume levels ! (ssh at t-, u-, v, f-points)
[2528]	410	! !--------------------------!
	411	!
[2715]	412	IF( neuler == 0 .AND. kt == nit000 ) THEN !** Euler time-stepping at first time-step : no filter
	413	sshn (:,:) = ssha (:,:) ! now <-- after (before already = now)
[1438]	414	sshu_n(:,:) = sshu_a(:,:)
	415	sshv_n(:,:) = sshv_a(:,:)
[2715]	416	DO jj = 1, jpjm1 ! ssh now at f-point
[2528]	417	DO ji = 1, jpim1 ! NO Vector Opt.
[3211]	418	#if defined key_z_first
	419	sshf_n(ji,jj) = 0.5 * umask_1(ji,jj) * umask_1(ji,jj+1) &
	420	& / ( e1f(ji,jj ) * e2f(ji,jj ) ) &
	421	& * ( e1u(ji,jj ) * e2u(ji,jj ) * sshu_n(ji,jj ) &
	422	& + e1u(ji,jj+1) * e2u(ji,jj+1) * sshu_n(ji,jj+1) )
	423	#else
[2715]	424	sshf_n(ji,jj) = 0.5 * umask(ji,jj,1) * umask(ji,jj+1,1) &
[2528]	425	& / ( e1f(ji,jj ) * e2f(ji,jj ) ) &
	426	& * ( e1u(ji,jj ) * e2u(ji,jj ) * sshu_n(ji,jj ) &
	427	& + e1u(ji,jj+1) * e2u(ji,jj+1) * sshu_n(ji,jj+1) )
[3211]	428	#endif
[2528]	429	END DO
	430	END DO
[2715]	431	CALL lbc_lnk( sshf_n, 'F', 1. ) ! Boundaries conditions
	432	!
	433	ELSE !** Leap-Frog time-stepping: Asselin filter + swap
[4438]	434
	435	#if defined ARPDBGSUM
[4415]	436	WRITE(,) 'ARPDBG: ssh_nxt: SUM of sshb = ',SUM(sshb),' at step=',kt
	437	WRITE(,) 'ARPDBG: ssh_nxt: SUM of sshn = ',SUM(sshn),' at step=',kt
[4438]	438	#endif
	439
[2528]	440	zec = atfp * rdt / rau0
[1438]	441	DO jj = 1, jpj
[2715]	442	DO ji = 1, jpi ! before <-- now filtered
[3211]	443	#if defined key_z_first
[2528]	444	sshb (ji,jj) = sshn (ji,jj) + atfp * ( sshb(ji,jj) - 2 * sshn(ji,jj) + ssha(ji,jj) ) &
[3211]	445	& - zec * ( emp_b(ji,jj) - emp(ji,jj) ) * tmask_1(ji,jj)
	446	#else
	447	sshb (ji,jj) = sshn (ji,jj) + atfp * ( sshb(ji,jj) - 2 * sshn(ji,jj) + ssha(ji,jj) ) &
[2528]	448	& - zec * ( emp_b(ji,jj) - emp(ji,jj) ) * tmask(ji,jj,1)
[3211]	449	#endif
[2715]	450	sshn (ji,jj) = ssha (ji,jj) ! now <-- after
[1438]	451	sshu_n(ji,jj) = sshu_a(ji,jj)
	452	sshv_n(ji,jj) = sshv_a(ji,jj)
	453	END DO
	454	END DO
[2715]	455	DO jj = 1, jpjm1 ! ssh now at f-point
[2528]	456	DO ji = 1, jpim1 ! NO Vector Opt.
[3211]	457	#if defined key_z_first
	458	sshf_n(ji,jj) = 0.5 * umask_1(ji,jj) * umask_1(ji,jj+1) &
	459	& / ( e1f(ji,jj ) * e2f(ji,jj ) ) &
	460	& * ( e1u(ji,jj ) * e2u(ji,jj ) * sshu_n(ji,jj ) &
	461	& + e1u(ji,jj+1) * e2u(ji,jj+1) * sshu_n(ji,jj+1) )
	462	#else
[2528]	463	sshf_n(ji,jj) = 0.5 * umask(ji,jj,1) * umask(ji,jj+1,1) &
	464	& / ( e1f(ji,jj ) * e2f(ji,jj ) ) &
	465	& * ( e1u(ji,jj ) * e2u(ji,jj ) * sshu_n(ji,jj ) &
	466	& + e1u(ji,jj+1) * e2u(ji,jj+1) * sshu_n(ji,jj+1) )
[3211]	467	#endif
[2528]	468	END DO
	469	END DO
[2715]	470	CALL lbc_lnk( sshf_n, 'F', 1. ) ! Boundaries conditions
	471	!
	472	DO jj = 1, jpjm1 ! ssh before at u- & v-points
[2528]	473	DO ji = 1, jpim1 ! NO Vector Opt.
[3211]	474	#if defined key_z_first
	475	sshu_b(ji,jj) = 0.5 * umask_1(ji,jj) / ( e1u(ji ,jj) * e2u(ji ,jj) ) &
	476	& * ( e1t(ji ,jj) * e2t(ji ,jj) * sshb(ji ,jj) &
	477	& + e1t(ji+1,jj) * e2t(ji+1,jj) * sshb(ji+1,jj) )
	478	sshv_b(ji,jj) = 0.5 * vmask_1(ji,jj) / ( e1v(ji,jj ) * e2v(ji,jj ) ) &
	479	& * ( e1t(ji,jj ) * e2t(ji,jj ) * sshb(ji,jj ) &
	480	& + e1t(ji,jj+1) * e2t(ji,jj+1) * sshb(ji,jj+1) )
	481	#else
[2528]	482	sshu_b(ji,jj) = 0.5 * umask(ji,jj,1) / ( e1u(ji ,jj) * e2u(ji ,jj) ) &
	483	& * ( e1t(ji ,jj) * e2t(ji ,jj) * sshb(ji ,jj) &
	484	& + e1t(ji+1,jj) * e2t(ji+1,jj) * sshb(ji+1,jj) )
	485	sshv_b(ji,jj) = 0.5 * vmask(ji,jj,1) / ( e1v(ji,jj ) * e2v(ji,jj ) ) &
	486	& * ( e1t(ji,jj ) * e2t(ji,jj ) * sshb(ji,jj ) &
	487	& + e1t(ji,jj+1) * e2t(ji,jj+1) * sshb(ji,jj+1) )
[3211]	488	#endif
[2528]	489	END DO
	490	END DO
	491	CALL lbc_lnk( sshu_b, 'U', 1. )
[2715]	492	CALL lbc_lnk( sshv_b, 'V', 1. ) ! Boundaries conditions
	493	!
[1438]	494	ENDIF
[2528]	495	! !--------------------------!
[2715]	496	ELSE ! fixed levels ! (ssh at t-point only)
[2528]	497	! !--------------------------!
[1438]	498	!
[2715]	499	IF( neuler == 0 .AND. kt == nit000 ) THEN !** Euler time-stepping at first time-step : no filter
	500	sshn(:,:) = ssha(:,:) ! now <-- after (before already = now)
[1438]	501	!
[2715]	502	ELSE ! Leap-Frog time-stepping: Asselin filter + swap
[1438]	503	DO jj = 1, jpj
[2715]	504	DO ji = 1, jpi ! before <-- now filtered
[2528]	505	sshb(ji,jj) = sshn(ji,jj) + atfp * ( sshb(ji,jj) - 2 * sshn(ji,jj) + ssha(ji,jj) )
[2715]	506	sshn(ji,jj) = ssha(ji,jj) ! now <-- after
[1438]	507	END DO
	508	END DO
	509	ENDIF
	510	!
	511	ENDIF
	512	!
[2528]	513	! Update velocity at AGRIF zoom boundaries
[2486]	514	#if defined key_agrif
[2528]	515	IF ( .NOT.Agrif_Root() ) CALL Agrif_Update_Dyn( kt )
[2486]	516	#endif
[1438]	517	!
[2528]	518	IF(ln_ctl) CALL prt_ctl( tab2d_1=sshb, clinfo1=' sshb - : ', mask1=tmask, ovlap=1 )
	519	!
[1438]	520	END SUBROUTINE ssh_nxt
[3]	521
	522	!!======================================================================
[1565]	523	END MODULE sshwzv

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