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source: trunk/NEMO/OPA_SRC/step.F90 @ 1466

Last change on this file since 1466 was 1465, checked in by smasson, 15 years ago
supress ice_oce module, see ticket:448
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 24.2 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	!!----------------------------------------------------------------------
23
24	!!----------------------------------------------------------------------
25	!! stp : OPA system time-stepping
26	!!----------------------------------------------------------------------
27	USE oce ! ocean dynamics and tracers variables
28	USE dom_oce ! ocean space and time domain variables
29	USE zdf_oce ! ocean vertical physics variables
30	USE ldftra_oce ! ocean tracer - trends
31	USE ldfdyn_oce ! ocean dynamics - trends
32	USE in_out_manager ! I/O manager
33	USE iom !
34	USE lbclnk
35
36	USE daymod ! calendar (day routine)
37
38	USE dtatem ! ocean temperature data (dta_tem routine)
39	USE dtasal ! ocean salinity data (dta_sal routine)
40	USE sbcmod ! surface boundary condition (sbc routine)
41	USE sbcrnf ! surface boundary condition: runoff variables
42	USE sbccpl ! surface boundary condition: coupled formulation (call send at end of step)
43	USE cpl_oasis3, ONLY : lk_cpl
44
45	USE trcstp ! passive tracer time-stepping (trc_stp routine)
46
47	USE traqsr ! solar radiation penetration (tra_qsr routine)
48	USE trasbc ! surface boundary condition (tra_sbc routine)
49	USE trabbc ! bottom boundary condition (tra_bbc routine)
50	USE trabbl ! bottom boundary layer (tra_bbl routine)
51	USE tradmp ! internal damping (tra_dmp routine)
52	USE traadv ! advection scheme control (tra_adv_ctl routine)
53	USE traldf ! lateral mixing (tra_ldf routine)
54	USE cla ! cross land advection (tra_cla routine)
55	! zdfkpp ! KPP non-local tracer fluxes (tra_kpp routine)
56	USE trazdf ! vertical mixing (tra_zdf routine)
57	USE tranxt ! time-stepping (tra_nxt routine)
58	USE tranpc ! non-penetrative convection (tra_npc routine)
59
60	USE eosbn2 ! equation of state (eos_bn2 routine)
61
62	USE dynadv ! advection (dyn_adv routine)
63	USE dynvor ! vorticity term (dyn_vor routine)
64	USE dynhpg ! hydrostatic pressure grad. (dyn_hpg routine)
65	USE dynldf ! lateral momentum diffusion (dyn_ldf routine)
66	USE dynzdf ! vertical diffusion (dyn_zdf routine)
67	USE dynspg_oce ! surface pressure gradient (dyn_spg routine)
68	USE dynspg ! surface pressure gradient (dyn_spg routine)
69	USE dynnxt ! time-stepping (dyn_nxt routine)
70
71	USE obc_par ! open boundary condition variables
72	USE obcdta ! open boundary condition data (obc_dta routine)
73	USE obcrst ! open boundary cond. restart (obc_rst routine)
74	USE obcrad ! open boundary cond. radiation (obc_rad routine)
75	USE obcspg ! open boundary cond spg (obc_spg routine)
76
77	USE bdy_par ! unstructured open boundary data variables
78	USE bdydta ! unstructured open boundary data (bdy_dta routine)
79
80	USE divcur ! hor. divergence and curl (div & cur routines)
81	USE cla_div ! cross land: hor. divergence (div_cla routine)
82	USE wzvmod ! vertical velocity (wzv routine)
83
84	USE ldfslp ! iso-neutral slopes (ldf_slp routine)
85	USE ldfeiv ! eddy induced velocity coef. (ldf_eiv routine)
86
87	USE zdftmx ! tide-induced vertical mixing (zdf_tmx routine)
88	USE zdfbfr ! bottom friction (zdf_bfr routine)
89	USE zdftke ! TKE vertical mixing (zdf_tke routine)
90	USE zdftke2 ! TKE2 vertical mixing (zdf_tke2 routine)
91	USE zdfkpp ! KPP vertical mixing (zdf_kpp routine)
92	USE zdfddm ! double diffusion mixing (zdf_ddm routine)
93	USE zdfevd ! enhanced vertical diffusion (zdf_evd routine)
94	USE zdfric ! Richardson vertical mixing (zdf_ric routine)
95	USE zdfmxl ! Mixed-layer depth (zdf_mxl routine)
96
97	USE zpshde ! partial step: hor. derivative (zps_hde routine)
98
99	USE diawri ! Standard run outputs (dia_wri routine)
100	USE trdicp ! Ocean momentum/tracers trends (trd_wri routine)
101	USE trdmld ! mixed-layer trends (trd_mld routine)
102	USE trdmld_rst ! restart for mixed-layer trends
103	USE trdmod_oce ! ocean momentum/tracers trends
104	USE trdvor ! vorticity budget (trd_vor routine)
105	USE diagap ! hor. mean model-data gap (dia_gap routine)
106	USE diahdy ! dynamic height (dia_hdy routine)
107	USE diaptr ! poleward transports (dia_ptr routine)
108	USE diahth ! thermocline depth (dia_hth routine)
109	USE diafwb ! freshwater budget (dia_fwb routine)
110	USE diaspr ! suface pressure (rigid-lid) (dia_spr routine)
111	USE flo_oce ! floats variables
112	USE floats ! floats computation (flo_stp routine)
113
114	USE stpctl ! time stepping control (stp_ctl routine)
115	USE restart ! ocean restart (rst_wri routine)
116	USE prtctl ! Print control (prt_ctl routine)
117
118	#if defined key_agrif
119	USE agrif_opa_sponge ! Momemtum and tracers sponges
120	#endif
121
122	IMPLICIT NONE
123	PRIVATE
124
125	PUBLIC stp ! called by opa.F90
126
127	!! * Substitutions
128	# include "domzgr_substitute.h90"
129	# include "zdfddm_substitute.h90"
130	!!----------------------------------------------------------------------
131	!! OPA 9.0 , LOCEAN-IPSL (2005)
132	!! $Id$
133	!! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt)
134	!!----------------------------------------------------------------------
135
136	CONTAINS
137
138	#if defined key_agrif
139	SUBROUTINE stp( )
140	INTEGER :: kstp ! ocean time-step index
141	#else
142	SUBROUTINE stp( kstp )
143	INTEGER, INTENT(in) :: kstp ! ocean time-step index
144	#endif
145	!!----------------------------------------------------------------------
146	!! * ROUTINE stp *
147	!!
148	!! ** Purpose : - Time stepping of OPA (momentum and active tracer eqs.)
149	!! - Time stepping of LIM (dynamic and thermodynamic eqs.)
150	!! - Tme stepping of TRC (passive tracer eqs.)
151	!!
152	!! ** Method : -1- Update forcings and data
153	!! -2- Update ocean physics
154	!! -3- Compute the t and s trends
155	!! -4- Update t and s
156	!! -5- Compute the momentum trends
157	!! -6- Update the horizontal velocity
158	!! -7- Compute the diagnostics variables (rd,N2, div,cur,w)
159	!! -8- Outputs and diagnostics
160	!!----------------------------------------------------------------------
161	INTEGER :: jk ! dummy loop indice
162	INTEGER :: indic ! error indicator if < 0
163	!! ---------------------------------------------------------------------
164
165	#if defined key_agrif
166	kstp = nit000 + Agrif_Nb_Step()
167	! IF ( Agrif_Root() .and. lwp) Write(,) '---'
168	! IF (lwp) Write(,) 'Grid Number',Agrif_Fixed(),' time step ',kstp
169	#endif
170	indic = 1 ! reset to no error condition
171
172	CALL day( kstp ) ! Calendar
173
174	CALL iom_setkt( kstp ) ! say to iom that we are at time step kstp
175
176	CALL rst_opn( kstp ) ! Open the restart file
177
178	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
179	! Update data, open boundaries, surface boundary condition (including sea-ice)
180	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
181
182	IF( lk_dtatem ) CALL dta_tem( kstp ) ! update 3D temperature data
183	IF( lk_dtasal ) CALL dta_sal( kstp ) ! update 3D salinity data
184
185	CALL sbc ( kstp ) ! Sea Boundary Condition (including sea-ice)
186
187	IF( lk_obc ) CALL obc_dta( kstp ) ! update dynamic and tracer data at open boundaries
188	IF( lk_obc ) CALL obc_rad( kstp ) ! compute phase velocities at open boundaries
189
190	IF( lk_bdy ) CALL bdy_dta( kstp ) ! update dynamic and tracer data at unstructured open boundary
191
192	IF( ninist == 1 ) THEN ! Output the initial state and forcings
193	CALL dia_wri_state( 'output.init', kstp )
194	ninist = 0
195	ENDIF
196
197	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
198	! Ocean dynamics : ssh, wn, hdiv, rot !
199	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
200	CALL div_cur( kstp ) ! Horizontal divergence & Relative vorticity
201	IF( n_cla == 1 ) CALL div_cla( kstp ) ! Cross Land Advection (Update Hor. divergence)
202	CALL ssh_wzv( kstp ) ! after ssh & vertical velocity
203
204	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
205	! Ocean physics update
206	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
207	! N.B. ua, va, ta, sa arrays are used as workspace in this section
208	!-----------------------------------------------------------------------
209	IF( neuler == 0 .AND. kstp == nit000 ) THEN
210	CALL bn2( tn, sn, rn2 ) ! now Brunt-Vaisala frequency
211	rn2b(:,:,:) = rn2(:,:,:)
212	ELSE
213	rn2b(:,:,:) = rn2(:,:,:) ! before Brunt-Vaisala frequency
214	CALL bn2( tn, sn, rn2 ) ! now Brunt-Vaisala frequency
215	ENDIF
216
217	#if defined key_zdftke2
218	IF ( ln_dynhpg_imp ) THEN
219	!-----------------------------------------------------------------------
220	! LATERAL PHYSICS
221	!-----------------------------------------------------------------------
222	CALL zdf_mxl( kstp ) ! mixed layer depth
223	IF( lk_ldfslp ) CALL ldf_slp( kstp, rhd, rn2b ) ! before slope of the lateral mixing
224	# if defined key_traldf_c2d
225	IF( lk_traldf_eiv ) CALL ldf_eiv( kstp ) ! eddy induced velocity coefficient
226	# endif
227	ENDIF
228	#endif
229	!-----------------------------------------------------------------------
230	! VERTICAL PHYSICS
231	!-----------------------------------------------------------------------
232	! ! Vertical eddy viscosity and diffusivity coefficients
233	IF( lk_zdfric ) CALL zdf_ric( kstp ) ! Richardson number dependent Kz
234
235	IF( lk_zdftke ) CALL zdf_tke ( kstp ) ! TKE closure scheme for Kz
236	IF( lk_zdftke2) CALL zdf_tke2( kstp ) ! TKE2 closure scheme for Kz
237
238	IF( lk_zdfkpp ) CALL zdf_kpp( kstp ) ! KPP closure scheme for Kz
239
240	IF( lk_zdfcst ) THEN ! Constant Kz (reset avt, avm[uv] to the background value)
241	avt (:,:,:) = avt0 * tmask(:,:,:)
242	avmu(:,:,:) = avm0 * umask(:,:,:)
243	avmv(:,:,:) = avm0 * vmask(:,:,:)
244	ENDIF
245
246	IF( ln_rnf_mouth ) THEN ! increase diffusivity at rivers mouths
247	DO jk = 2, nkrnf ; avt(:,:,jk) = avt(:,:,jk) + 2.e0 * rn_avt_rnf * rnfmsk(:,:) * tmask(:,:,jk) ; END DO
248	ENDIF
249
250	IF( ln_zdfevd ) CALL zdf_evd( kstp ) ! enhanced vertical eddy diffusivity
251
252	IF( lk_zdfddm .AND. .NOT. lk_zdfkpp ) &
253	& CALL zdf_ddm( kstp ) ! double diffusive mixing
254
255	IF( lk_zdftmx ) CALL zdf_tmx( kstp ) ! tidal vertical mixing
256
257	CALL zdf_bfr( kstp ) ! bottom friction
258
259	CALL zdf_mxl( kstp ) ! mixed layer depth
260
261	#if defined key_zdftke2
262	IF( .NOT. ln_dynhpg_imp ) THEN
263	CALL eos( tb, sb, rhd, rhop ) ! now (swap=before) in situ density for dynhpg module
264	#endif
265	!-----------------------------------------------------------------------
266	! LATERAL PHYSICS
267	!-----------------------------------------------------------------------
268	IF( lk_ldfslp ) CALL ldf_slp( kstp, rhd, rn2b ) ! before slope of the lateral mixing
269	#if defined key_traldf_c2d
270	IF( lk_traldf_eiv ) CALL ldf_eiv( kstp ) ! eddy induced velocity coefficient
271	# endif
272	#if defined key_zdftke2
273	ENDIF
274	#endif
275
276	#if defined key_top
277	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
278	! Passive Tracer Model
279	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
280	! N.B. ua, va, ta, sa arrays are used as workspace in this section
281	!-----------------------------------------------------------------------
282	CALL trc_stp( kstp ) ! time-stepping
283	#endif
284
285	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
286	! Active tracers
287	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
288	! N.B. ua, va arrays are used as workspace in this section
289	!-----------------------------------------------------------------------
290	ta(:,:,:) = 0.e0 ! set tracer trends to zero
291	sa(:,:,:) = 0.e0
292
293	CALL tra_sbc ( kstp ) ! surface boundary condition
294	IF( ln_traqsr ) CALL tra_qsr ( kstp ) ! penetrative solar radiation qsr
295	IF( lk_trabbc ) CALL tra_bbc ( kstp ) ! bottom heat flux
296	IF( lk_trabbl_dif ) CALL tra_bbl_dif( kstp ) ! diffusive bottom boundary layer scheme
297	IF( lk_trabbl_adv ) CALL tra_bbl_adv( kstp ) ! advective (and/or diffusive) bottom boundary layer scheme
298	IF( lk_tradmp ) CALL tra_dmp ( kstp ) ! internal damping trends
299	CALL tra_adv ( kstp ) ! horizontal & vertical advection
300	IF( n_cla == 1 ) CALL tra_cla ( kstp ) ! Cross Land Advection (Update Hor. advection)
301	IF( lk_zdfkpp ) CALL tra_kpp ( kstp ) ! KPP non-local tracer fluxes
302	CALL tra_ldf ( kstp ) ! lateral mixing
303	#if defined key_agrif
304	IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_tra ! tracers sponge
305	#endif
306	CALL tra_zdf ( kstp ) ! vertical mixing and after tracer fields
307
308	#if ! defined key_zdftke2
309	IF( ln_zdfnpc ) CALL tra_npc ( kstp ) ! update after fields by non-penetrative convection
310	CALL tra_nxt ( kstp ) ! tracer fields at next time step
311
312	IF( ln_dynhpg_imp ) THEN ! semi-implicit hpg
313	CALL eos( ta, sa, rhd, rhop ) ! Time-filtered in situ density used in dynhpg module
314	IF( ln_zps ) CALL zps_hde( kstp, ta, sa, rhd, & ! Partial steps: time filtered hor. gradient
315	& gtu, gsu, gru, & ! of t, s, rd at the bottom ocean level
316	& gtv, gsv, grv )
317	ELSE ! centered hpg (default case)
318	CALL eos( tb, sb, rhd, rhop ) ! now (swap=before) in situ density for dynhpg module
319	IF( ln_zps ) CALL zps_hde( kstp, tb, sb, rhd, & ! Partial steps: now horizontal gradient
320	& gtu, gsu, gru, & ! of t, s, rd at the bottom ocean level
321	& gtv, gsv, grv )
322	ENDIF
323	#else
324	IF( .NOT. ln_dynhpg_imp ) THEN ! centered hpg (default case)
325	CALL eos( tn, sn, rhd, rhop ) ! now (swap=before) in situ density for dynhpg module
326	IF( ln_zps ) CALL zps_hde( kstp, tn, sn, rhd, & ! Partial steps: now horizontal gradient
327	& gtu, gsu, gru, & ! of t, s, rd at the bottom ocean level
328	& gtv, gsv, grv )
329	ENDIF
330	IF( ln_zdfnpc ) CALL tra_npc ( kstp ) ! update after fields by non-penetrative convection
331	CALL tra_nxt ( kstp ) ! tracer fields at next time step
332	IF( ln_dynhpg_imp ) THEN ! semi-implicit hpg
333	CALL eos( ta, sa, rhd, rhop ) ! Time-filtered in situ density used in dynhpg module
334	IF( lk_ldfslp ) CALL bn2( ta, sa, rn2 ) ! Time-filtered Brunt-Vaisala frequency
335	IF( ln_zps ) CALL zps_hde( kstp, ta, sa, rhd, & ! Partial steps: time filtered hor. gradient
336	& gtu, gsu, gru, & ! of t, s, rd at the bottom ocean level
337	& gtv, gsv, grv )
338	ENDIF
339	#endif
340	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
341	! Dynamics
342	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
343	! N.B. ta, sa arrays are used as workspace in this section
344	!-----------------------------------------------------------------------
345	ua(:,:,:) = 0.e0 ! set dynamics trends to zero
346	va(:,:,:) = 0.e0
347
348	CALL dyn_adv( kstp ) ! advection (vector or flux form)
349	CALL dyn_vor( kstp ) ! vorticity term including Coriolis
350	CALL dyn_ldf( kstp ) ! lateral mixing
351	#if defined key_agrif
352	IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_dyn ! momemtum sponge
353	#endif
354	CALL dyn_hpg( kstp ) ! horizontal gradient of Hydrostatic pressure
355	CALL dyn_zdf( kstp ) ! vertical diffusion
356	IF( lk_dynspg_rl ) THEN
357	IF( lk_obc ) CALL obc_spg( kstp ) ! surface pressure gradient at open boundaries
358	ENDIF
359	indic=0
360	CALL dyn_spg( kstp, indic ) ! surface pressure gradient
361	CALL dyn_nxt( kstp ) ! lateral velocity at next time step
362
363	CALL ssh_nxt( kstp ) ! sea surface height at next time step
364
365	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
366	! Control and restarts
367	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
368	CALL stp_ctl( kstp, indic )
369	IF( indic < 0 ) CALL ctl_stop( 'step: indic < 0' )
370	IF( kstp == nit000 ) CALL iom_close( numror ) ! close input ocean restart file
371	IF( lrst_oce ) CALL rst_write ( kstp ) ! write output ocean restart file
372	IF( lk_obc ) CALL obc_rst_write( kstp ) ! write open boundary restart file
373
374	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
375	! diagnostics and outputs
376	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
377	! N.B. ua, va, ta, sa arrays are used as workspace in this section
378	!-----------------------------------------------------------------------
379
380	IF( nstop == 0 ) THEN ! Diagnostics:
381	IF( lk_floats ) CALL flo_stp( kstp ) ! drifting Floats
382	IF( lk_trddyn ) CALL trd_dwr( kstp ) ! trends: dynamics
383	IF( lk_trdtra ) CALL trd_twr( kstp ) ! trends: active tracers
384	IF( lk_trdmld ) CALL trd_mld( kstp ) ! trends: Mixed-layer
385	IF( lk_trdvor ) CALL trd_vor( kstp ) ! trends: vorticity budget
386	IF( lk_diaspr ) CALL dia_spr( kstp ) ! Surface pressure diagnostics
387	IF( lk_diahth ) CALL dia_hth( kstp ) ! Thermocline depth (20 degres isotherm depth)
388	IF( lk_diagap ) CALL dia_gap( kstp ) ! basin averaged diagnostics
389	IF( lk_diahdy ) CALL dia_hdy( kstp ) ! dynamical heigh diagnostics
390	IF( lk_diafwb ) CALL dia_fwb( kstp ) ! Fresh water budget diagnostics
391	IF( ln_diaptr ) CALL dia_ptr( kstp ) ! Poleward TRansports diagnostics
392	! ! outputs
393	CALL dia_wri( kstp, indic ) ! ocean model: outputs
394	ENDIF
395
396	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
397	! Coupled mode
398	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
399
400	IF( lk_cpl ) CALL sbc_cpl_snd( kstp ) ! coupled mode : field exchanges
401
402	#if defined key_zdftke2
403	IF( ( kstp == nitend ).AND.( lrst_oce ) ) THEN
404
405	CALL day( kstp+1 ) ! Calendar
406	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
407	! Update data, open boundaries, surface boundary condition (including sea-ice)
408	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
409	CALL sbc ( kstp+1 ) ! Sea Boundary Condition (including sea-ice)
410	!-----------------------------------------------------------------------
411	! VERTICAL PHYSICS
412	!-----------------------------------------------------------------------
413	! N.B. ua, va, ta, sa arrays are used as workspace in this section
414	!-----------------------------------------------------------------------
415	CALL bn2( tn, sn, rn2 ) ! now Brunt-Vaisala frequency
416	! ! Vertical eddy viscosity and diffusivity coefficients
417	IF( lk_zdftke2 ) CALL zdf_tke2 ( kstp+1 ) ! TKE2 closure scheme for Kz
418	CALL rst_write( kstp+1 ) ! close the restart file
419	ENDIF
420	#endif
421	!
422	END SUBROUTINE stp
423
424	!!======================================================================
425	END MODULE step

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