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step.F90 in NEMO/branches/2019/dev_r11943_MERGE_2019/src/OCE – NEMO

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source: NEMO/branches/2019/dev_r11943_MERGE_2019/src/OCE/step.F90 @ 12250

Last change on this file since 12250 was 12250, checked in by smasson, 4 years ago
rev12240_dev_r11943_MERGE_2019: same as [12246], add modifications from dev_r12114_ticket_2263, results unchanged except SPITZ12 as explained in #2263
Property svn:keywords set to `Id`
File size: 21.4 KB

Line
1	MODULE step
2	!!======================================================================
3	!! * MODULE step *
4	!! Time-stepping : manager of the ocean, tracer and ice time stepping
5	!!======================================================================
6	!! History : OPA ! 1991-03 (G. Madec) Original code
7	!! - ! 1991-11 (G. Madec)
8	!! - ! 1992-06 (M. Imbard) add a first output record
9	!! - ! 1996-04 (G. Madec) introduction of dynspg
10	!! - ! 1996-04 (M.A. Foujols) introduction of passive tracer
11	!! 8.0 ! 1997-06 (G. Madec) new architecture of call
12	!! 8.2 ! 1997-06 (G. Madec, M. Imbard, G. Roullet) free surface
13	!! - ! 1999-02 (G. Madec, N. Grima) hpg implicit
14	!! - ! 2000-07 (J-M Molines, M. Imbard) Open Bondary Conditions
15	!! NEMO 1.0 ! 2002-06 (G. Madec) free form, suppress macro-tasking
16	!! - ! 2004-08 (C. Talandier) New trends organization
17	!! - ! 2005-01 (C. Ethe) Add the KPP closure scheme
18	!! - ! 2005-11 (G. Madec) Reorganisation of tra and dyn calls
19	!! - ! 2006-01 (L. Debreu, C. Mazauric) Agrif implementation
20	!! - ! 2006-07 (S. Masson) restart using iom
21	!! 3.2 ! 2009-02 (G. Madec, R. Benshila) reintroduicing z*-coordinate
22	!! - ! 2009-06 (S. Masson, G. Madec) TKE restart compatible with key_cpl
23	!! 3.3 ! 2010-05 (K. Mogensen, A. Weaver, M. Martin, D. Lea) Assimilation interface
24	!! - ! 2010-10 (C. Ethe, G. Madec) reorganisation of initialisation phase + merge TRC-TRA
25	!! 3.4 ! 2011-04 (G. Madec, C. Ethe) Merge of dtatem and dtasal
26	!! 3.6 ! 2012-07 (J. Simeon, G. Madec. C. Ethe) Online coarsening of outputs
27	!! 3.6 ! 2014-04 (F. Roquet, G. Madec) New equations of state
28	!! 3.6 ! 2014-10 (E. Clementi, P. Oddo) Add Qiao vertical mixing in case of waves
29	!! 3.7 ! 2014-10 (G. Madec) LDF simplication
30	!! - ! 2014-12 (G. Madec) remove KPP scheme
31	!! - ! 2015-11 (J. Chanut) free surface simplification (remove filtered free surface)
32	!! 4.0 ! 2017-05 (G. Madec) introduction of the vertical physics manager (zdfphy)
33	!! 4.1 ! 2019-08 (A. Coward, D. Storkey) rewrite in preparation for new timestepping scheme
34	!!----------------------------------------------------------------------
35
36	!!----------------------------------------------------------------------
37	!! stp : OPA system time-stepping
38	!!----------------------------------------------------------------------
39	USE step_oce ! time stepping definition modules
40	!
41	USE iom ! xIOs server
42
43	IMPLICIT NONE
44	PRIVATE
45
46	PUBLIC stp ! called by nemogcm.F90
47
48	!!----------------------------------------------------------------------
49	!! time level indices
50	!!----------------------------------------------------------------------
51	INTEGER, PUBLIC :: Nbb, Nnn, Naa, Nrhs !! used by nemo_init
52
53	!!----------------------------------------------------------------------
54	!! NEMO/OCE 4.0 , NEMO Consortium (2018)
55	!! $Id$
56	!! Software governed by the CeCILL license (see ./LICENSE)
57	!!----------------------------------------------------------------------
58	CONTAINS
59
60	#if defined key_agrif
61	RECURSIVE SUBROUTINE stp( )
62	INTEGER :: kstp ! ocean time-step index
63	#else
64	SUBROUTINE stp( kstp )
65	INTEGER, INTENT(in) :: kstp ! ocean time-step index
66	#endif
67	!!----------------------------------------------------------------------
68	!! * ROUTINE stp *
69	!!
70	!! ** Purpose : - Time stepping of OPA (momentum and active tracer eqs.)
71	!! - Time stepping of SI3 (dynamic and thermodynamic eqs.)
72	!! - Time stepping of TRC (passive tracer eqs.)
73	!!
74	!! ** Method : -1- Update forcings and data
75	!! -2- Update ocean physics
76	!! -3- Compute the t and s trends
77	!! -4- Update t and s
78	!! -5- Compute the momentum trends
79	!! -6- Update the horizontal velocity
80	!! -7- Compute the diagnostics variables (rd,N2, hdiv,w)
81	!! -8- Outputs and diagnostics
82	!!----------------------------------------------------------------------
83	INTEGER :: ji, jj, jk ! dummy loop indice
84	INTEGER :: indic ! error indicator if < 0
85	!!gm kcall can be removed, I guess
86	INTEGER :: kcall ! optional integer argument (dom_vvl_sf_nxt)
87	!! ---------------------------------------------------------------------
88	#if defined key_agrif
89	kstp = nit000 + Agrif_Nb_Step()
90	Kbb_a = Nbb; Kmm_a = Nnn; Krhs_a = Nrhs ! agrif_oce module copies of time level indices
91	IF( lk_agrif_debug ) THEN
92	IF( Agrif_Root() .and. lwp) WRITE(,) '---'
93	IF(lwp) WRITE(,) 'Grid Number', Agrif_Fixed(),' time step ', kstp, 'int tstep', Agrif_NbStepint()
94	ENDIF
95	IF( kstp == nit000 + 1 ) lk_agrif_fstep = .FALSE.
96	# if defined key_iomput
97	IF( Agrif_Nbstepint() == 0 ) CALL iom_swap( cxios_context )
98	# endif
99	#endif
100	!
101	IF( ln_timing ) CALL timing_start('stp')
102	!
103	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
104	! update I/O and calendar
105	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
106	indic = 0 ! reset to no error condition
107
108	IF( kstp == nit000 ) THEN ! initialize IOM context (must be done after nemo_init for AGRIF+XIOS+OASIS)
109	CALL iom_init( cxios_context, ld_closedef=.FALSE. ) ! for model grid (including passible AGRIF zoom)
110	IF( lk_diamlr ) CALL dia_mlr_iom_init ! with additional setup for multiple-linear-regression analysis
111	CALL iom_init_closedef
112	IF( ln_crs ) CALL iom_init( TRIM(cxios_context)//"_crs" ) ! for coarse grid
113	ENDIF
114	IF( kstp /= nit000 ) CALL day( kstp ) ! Calendar (day was already called at nit000 in day_init)
115	CALL iom_setkt( kstp - nit000 + 1, cxios_context ) ! tell IOM we are at time step kstp
116	IF( ln_crs ) CALL iom_setkt( kstp - nit000 + 1, TRIM(cxios_context)//"_crs" ) ! tell IOM we are at time step kstp
117
118	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
119	! Update external forcing (tides, open boundaries, ice shelf interaction and surface boundary condition (including sea-ice)
120	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
121	IF( ln_tide ) CALL tide_update( kstp ) ! update tide potential
122	IF( ln_apr_dyn ) CALL sbc_apr ( kstp ) ! atmospheric pressure (NB: call before bdy_dta which needs ssh_ib)
123	IF( ln_bdy ) CALL bdy_dta ( kstp, Nnn, pt_offset = 1. ) ! update dynamic & tracer data at open boundaries
124	IF( ln_isf ) CALL isf_stp ( kstp, Nnn )
125	CALL sbc ( kstp, Nbb, Nnn ) ! Sea Boundary Condition (including sea-ice)
126
127	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
128	! Update stochastic parameters and random T/S fluctuations
129	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
130	IF( ln_sto_eos ) CALL sto_par( kstp ) ! Stochastic parameters
131	IF( ln_sto_eos ) CALL sto_pts( ts(:,:,:,:,Nnn) ) ! Random T/S fluctuations
132
133	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
134	! Ocean physics update
135	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
136	! THERMODYNAMICS
137	CALL eos_rab( ts(:,:,:,:,Nbb), rab_b, Nnn ) ! before local thermal/haline expension ratio at T-points
138	CALL eos_rab( ts(:,:,:,:,Nnn), rab_n, Nnn ) ! now local thermal/haline expension ratio at T-points
139	CALL bn2 ( ts(:,:,:,:,Nbb), rab_b, rn2b, Nnn ) ! before Brunt-Vaisala frequency
140	CALL bn2 ( ts(:,:,:,:,Nnn), rab_n, rn2, Nnn ) ! now Brunt-Vaisala frequency
141
142	! VERTICAL PHYSICS
143	CALL zdf_phy( kstp, Nbb, Nnn, Nrhs ) ! vertical physics update (top/bot drag, avt, avs, avm + MLD)
144
145	! LATERAL PHYSICS
146	!
147	IF( l_ldfslp ) THEN ! slope of lateral mixing
148	CALL eos( ts(:,:,:,:,Nbb), rhd, gdept_0(:,:,:) ) ! before in situ density
149
150	IF( ln_zps .AND. .NOT. ln_isfcav) &
151	& CALL zps_hde ( kstp, Nnn, jpts, ts(:,:,:,:,Nbb), gtsu, gtsv, & ! Partial steps: before horizontal gradient
152	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
153
154	IF( ln_zps .AND. ln_isfcav) &
155	& CALL zps_hde_isf( kstp, Nnn, jpts, ts(:,:,:,:,Nbb), gtsu, gtsv, gtui, gtvi, & ! Partial steps for top cell (ISF)
156	& rhd, gru , grv , grui, grvi ) ! of t, s, rd at the first ocean level
157	IF( ln_traldf_triad ) THEN
158	CALL ldf_slp_triad( kstp, Nbb, Nnn ) ! before slope for triad operator
159	ELSE
160	CALL ldf_slp ( kstp, rhd, rn2b, Nbb, Nnn ) ! before slope for standard operator
161	ENDIF
162	ENDIF
163	! ! eddy diffusivity coeff.
164	IF( l_ldftra_time .OR. l_ldfeiv_time ) CALL ldf_tra( kstp, Nbb, Nnn ) ! and/or eiv coeff.
165	IF( l_ldfdyn_time ) CALL ldf_dyn( kstp, Nbb ) ! eddy viscosity coeff.
166
167	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
168	! Ocean dynamics : hdiv, ssh, e3, u, v, w
169	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
170
171	CALL ssh_nxt ( kstp, Nbb, Nnn, ssh, Naa ) ! after ssh (includes call to div_hor)
172	IF( .NOT.ln_linssh ) CALL dom_vvl_sf_nxt( kstp, Nbb, Nnn, Naa ) ! after vertical scale factors
173	CALL wzv ( kstp, Nbb, Nnn, ww, Naa ) ! now cross-level velocity
174	IF( ln_zad_Aimp ) CALL wAimp ( kstp, Nnn ) ! Adaptive-implicit vertical advection partitioning
175	CALL eos ( ts(:,:,:,:,Nnn), rhd, rhop, gdept(:,:,:,Nnn) ) ! now in situ density for hpg computation
176
177
178	uu(:,:,:,Nrhs) = 0._wp ! set dynamics trends to zero
179	vv(:,:,:,Nrhs) = 0._wp
180
181	IF( lk_asminc .AND. ln_asmiau .AND. ln_dyninc ) &
182	& CALL dyn_asm_inc ( kstp, Nbb, Nnn, uu, vv, Nrhs ) ! apply dynamics assimilation increment
183	IF( ln_bdy ) CALL bdy_dyn3d_dmp ( kstp, Nbb, uu, vv, Nrhs ) ! bdy damping trends
184	#if defined key_agrif
185	IF(.NOT. Agrif_Root()) &
186	& CALL Agrif_Sponge_dyn ! momentum sponge
187	#endif
188	CALL dyn_adv( kstp, Nbb, Nnn , uu, vv, Nrhs ) ! advection (VF or FF) ==> RHS
189	CALL dyn_vor( kstp, Nnn , uu, vv, Nrhs ) ! vorticity ==> RHS
190	CALL dyn_ldf( kstp, Nbb, Nnn , uu, vv, Nrhs ) ! lateral mixing
191	IF( ln_zdfosm ) CALL dyn_osm( kstp, Nnn , uu, vv, Nrhs ) ! OSMOSIS non-local velocity fluxes ==> RHS
192	CALL dyn_hpg( kstp, Nnn , uu, vv, Nrhs ) ! horizontal gradient of Hydrostatic pressure
193	CALL dyn_spg( kstp, Nbb, Nnn, Nrhs, uu, vv, ssh, uu_b, vv_b, Naa ) ! surface pressure gradient
194
195	! With split-explicit free surface, since now transports have been updated and ssh(:,:,Nrhs) as well
196	IF( ln_dynspg_ts ) THEN ! vertical scale factors and vertical velocity need to be updated
197	CALL div_hor ( kstp, Nbb, Nnn ) ! Horizontal divergence (2nd call in time-split case)
198	IF(.NOT.ln_linssh) CALL dom_vvl_sf_nxt( kstp, Nbb, Nnn, Naa, kcall=2 ) ! after vertical scale factors (update depth average component)
199	ENDIF
200	CALL dyn_zdf ( kstp, Nbb, Nnn, Nrhs, uu, vv, Naa ) ! vertical diffusion
201	IF( ln_dynspg_ts ) THEN ! vertical scale factors and vertical velocity need to be updated
202	CALL wzv ( kstp, Nbb, Nnn, ww, Naa ) ! now cross-level velocity
203	IF( ln_zad_Aimp ) CALL wAimp ( kstp, Nnn ) ! Adaptive-implicit vertical advection partitioning
204	ENDIF
205
206
207	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
208	! cool skin
209	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
210	IF ( ln_diurnal ) CALL diurnal_layers( kstp )
211
212	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
213	! diagnostics and outputs
214	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
215	IF( ln_floats ) CALL flo_stp ( kstp, Nbb, Nnn ) ! drifting Floats
216	IF( ln_diacfl ) CALL dia_cfl ( kstp, Nnn ) ! Courant number diagnostics
217	CALL dia_hth ( kstp, Nnn ) ! Thermocline depth (20 degres isotherm depth)
218	IF( ln_diadct ) CALL dia_dct ( kstp, Nnn ) ! Transports
219	CALL dia_ar5 ( kstp, Nnn ) ! ar5 diag
220	CALL dia_ptr ( kstp, Nnn ) ! Poleward adv/ldf TRansports diagnostics
221	CALL dia_wri ( kstp, Nnn ) ! ocean model: outputs
222	IF( ln_crs ) CALL crs_fld ( kstp, Nnn ) ! ocean model: online field coarsening & output
223	IF( lk_diadetide ) CALL dia_detide( kstp ) ! Weights computation for daily detiding of model diagnostics
224	IF( lk_diamlr ) CALL dia_mlr ! Update time used in multiple-linear-regression analysis
225
226	#if defined key_top
227	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
228	! Passive Tracer Model
229	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
230	CALL trc_stp ( kstp, Nbb, Nnn, Nrhs, Naa ) ! time-stepping
231	#endif
232
233	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
234	! Active tracers
235	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
236	ts(:,:,:,:,Nrhs) = 0._wp ! set tracer trends to zero
237
238	IF( lk_asminc .AND. ln_asmiau .AND. &
239	& ln_trainc ) CALL tra_asm_inc( kstp, Nbb, Nnn, ts, Nrhs ) ! apply tracer assimilation increment
240	CALL tra_sbc ( kstp, Nnn, ts, Nrhs ) ! surface boundary condition
241	IF( ln_traqsr ) CALL tra_qsr ( kstp, Nnn, ts, Nrhs ) ! penetrative solar radiation qsr
242	IF( ln_isf ) CALL tra_isf ( kstp, Nnn, ts, Nrhs ) ! ice shelf heat flux
243	IF( ln_trabbc ) CALL tra_bbc ( kstp, Nnn, ts, Nrhs ) ! bottom heat flux
244	IF( ln_trabbl ) CALL tra_bbl ( kstp, Nbb, Nnn, ts, Nrhs ) ! advective (and/or diffusive) bottom boundary layer scheme
245	IF( ln_tradmp ) CALL tra_dmp ( kstp, Nbb, Nnn, ts, Nrhs ) ! internal damping trends
246	IF( ln_bdy ) CALL bdy_tra_dmp( kstp, Nbb, ts, Nrhs ) ! bdy damping trends
247	#if defined key_agrif
248	IF(.NOT. Agrif_Root()) &
249	& CALL Agrif_Sponge_tra ! tracers sponge
250	#endif
251	CALL tra_adv ( kstp, Nbb, Nnn, ts, Nrhs ) ! hor. + vert. advection ==> RHS
252	IF( ln_zdfosm ) CALL tra_osm ( kstp, Nnn, ts, Nrhs ) ! OSMOSIS non-local tracer fluxes ==> RHS
253	IF( lrst_oce .AND. ln_zdfosm ) &
254	& CALL osm_rst ( kstp, Nnn, 'WRITE' ) ! write OSMOSIS outputs + ww (so must do here) to restarts
255	CALL tra_ldf ( kstp, Nbb, Nnn, ts, Nrhs ) ! lateral mixing
256
257	CALL tra_zdf ( kstp, Nbb, Nnn, Nrhs, ts, Naa ) ! vertical mixing and after tracer fields
258	IF( ln_zdfnpc ) CALL tra_npc ( kstp, Nnn, Nrhs, ts, Naa ) ! update after fields by non-penetrative convection
259
260	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
261	! Set boundary conditions, time filter and swap time levels
262	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
263	!!jc1: For agrif, it would be much better to finalize tracers/momentum here (e.g. bdy conditions) and move the swap
264	!! (and time filtering) after Agrif update. Then restart would be done after and would contain updated fields.
265	!! If so:
266	!! (i) no need to call agrif update at initialization time
267	!! (ii) no need to update "before" fields
268	!!
269	!! Apart from creating new tra_swp/dyn_swp routines, this however:
270	!! (i) makes boundary conditions at initialization time computed from updated fields which is not the case between
271	!! two restarts => restartability issue. One can circumvent this, maybe, by assuming "interface separation",
272	!! e.g. a shift of the feedback interface inside child domain.
273	!! (ii) requires that all restart outputs of updated variables by agrif (e.g. passive tracers/tke/barotropic arrays) are done at the same
274	!! place.
275	!!
276	!!jc2: dynnxt must be the latest call. e3t(:,:,:,Nbb) are indeed updated in that routine
277	CALL tra_atf ( kstp, Nbb, Nnn, Naa, ts ) ! time filtering of "now" tracer arrays
278	CALL dyn_atf ( kstp, Nbb, Nnn, Naa, uu, vv, e3t, e3u, e3v ) ! time filtering of "now" velocities and scale factors
279	CALL ssh_atf ( kstp, Nbb, Nnn, Naa, ssh ) ! time filtering of "now" sea surface height
280	!
281	! Swap time levels
282	Nrhs = Nbb
283	Nbb = Nnn
284	Nnn = Naa
285	Naa = Nrhs
286	!
287	IF(.NOT.ln_linssh) CALL dom_vvl_sf_update( kstp, Nbb, Nnn, Naa ) ! recompute vertical scale factors
288	!
289	IF( ln_diahsb ) CALL dia_hsb ( kstp, Nbb, Nnn ) ! - ML - global conservation diagnostics
290
291	!!gm : This does not only concern the dynamics ==>>> add a new title
292	!!gm2: why ouput restart before AGRIF update?
293	!!
294	!!jc: That would be better, but see comment above
295	!!
296	IF( lrst_oce ) CALL rst_write ( kstp, Nbb, Nnn ) ! write output ocean restart file
297	IF( ln_sto_eos ) CALL sto_rst_write( kstp ) ! write restart file for stochastic parameters
298
299	#if defined key_agrif
300	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
301	! AGRIF
302	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
303	Kbb_a = Nbb; Kmm_a = Nnn; Krhs_a = Nrhs ! agrif_oce module copies of time level indices
304	CALL Agrif_Integrate_ChildGrids( stp ) ! allows to finish all the Child Grids before updating
305
306	IF( Agrif_NbStepint() == 0 ) THEN
307	CALL Agrif_update_all( ) ! Update all components
308	ENDIF
309	#endif
310	IF( ln_diaobs ) CALL dia_obs ( kstp, Nnn ) ! obs-minus-model (assimilation) diagnostics (call after dynamics update)
311
312	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
313	! Control
314	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
315	CALL stp_ctl ( kstp, Nbb, Nnn, indic )
316
317	IF( kstp == nit000 ) THEN ! 1st time step only
318	CALL iom_close( numror ) ! close input ocean restart file
319	IF(lwm) CALL FLUSH ( numond ) ! flush output namelist oce
320	IF(lwm .AND. numoni /= -1 ) CALL FLUSH ( numoni ) ! flush output namelist ice (if exist)
321	ENDIF
322
323	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
324	! Coupled mode
325	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
326	!!gm why lk_oasis and not lk_cpl ????
327	IF( lk_oasis ) CALL sbc_cpl_snd( kstp, Nbb, Nnn ) ! coupled mode : field exchanges
328	!
329	#if defined key_iomput
330	IF( kstp == nitend .OR. indic < 0 ) THEN
331	CALL iom_context_finalize( cxios_context ) ! needed for XIOS+AGRIF
332	IF(lrxios) CALL iom_context_finalize( crxios_context )
333	IF( ln_crs ) CALL iom_context_finalize( trim(cxios_context)//"_crs" ) !
334	ENDIF
335	#endif
336	!
337	IF( ln_timing ) CALL timing_stop('stp')
338	!
339	END SUBROUTINE stp
340	!
341	!!======================================================================
342	END MODULE step

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