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source: trunk/NEMO/OPA_SRC/step.F90 @ 236

Last change on this file since 236 was 236, checked in by opalod, 19 years ago
CT : BUGFIX170 : correction of a bug which occurs near Gibraltar and Bab El Mandeb straits in the ORCA 2� configuration when using partial-steps and the MUSCL or TVD advection scheme
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 25.4 KB

Line
1	MODULE step
2	!!======================================================================
3	!! * MODULE step *
4	!! Time-stepping : manager of the ocean, tracer and ice time stepping
5	!!======================================================================
6
7	!!----------------------------------------------------------------------
8	!! stp : OPA system time-stepping
9	!!----------------------------------------------------------------------
10	!! * Modules used
11	USE oce ! ocean dynamics and tracers variables
12	USE dom_oce ! ocean space and time domain variables
13	USE zdf_oce ! ocean vertical physics variables
14	USE ldftra_oce
15	USE ldfdyn_oce
16	USE cpl_oce ! coupled ocean-atmosphere variables
17	USE in_out_manager ! I/O manager
18	USE lbclnk
19
20	USE daymod ! calendar (day routine)
21
22	USE dtatem ! ocean temperature data (dta_tem routine)
23	USE dtasal ! ocean salinity data (dta_sal routine)
24	USE dtasst ! ocean sea surface temerature (dta_sst routine)
25	USE taumod ! surface stress (tau routine)
26	USE flxmod ! thermohaline fluxes (flx routine)
27	USE ocesbc ! thermohaline fluxes (oce_sbc routine)
28	USE flxrnf ! runoffs (flx_rnf routine)
29	USE flxfwb ! freshwater budget correction (flx_fwb routine)
30	USE closea ! closed sea freshwater budget (flx_clo routine)
31	USE ocfzpt ! surface ocean freezing point (oc_fz_pt routine)
32
33	USE trcstp ! passive tracer time-stepping (trc_stp routine)
34
35	USE dynhpg ! hydrostatic pressure grad. (dyn_hpg routine)
36	USE dynhpg_atsk ! hydrostatic pressure grad. (dyn_hpg_atsk routine)
37	USE dynspg_fsc ! surface pressure gradient (dyn_spg_fsc routine)
38	USE dynspg_fsc_atsk ! surface pressure gradient (dyn_spgfsc_atsk routine)
39	USE dynspg_rl ! surface pressure gradient (dyn_spg_rl routine)
40	USE dynkeg ! kinetic energy gradient (dyn_keg routine)
41	USE dynvor ! vorticity term (dyn_vor_... routines)
42	USE dynzad ! vertical advection (dyn_adv routine)
43	USE dynldf_bilapg ! lateral mixing (dyn_ldf_bilapg routine)
44	USE dynldf_bilap ! lateral mixing (dyn_ldf_bilap routine)
45	USE dynldf_iso ! lateral mixing (dyn_ldf_iso routine)
46	USE dynldf_lap ! lateral mixing (dyn_ldf_lap routine)
47	USE dynzdf_imp ! vertical diffusion: implicit (dyn_zdf routine)
48	USE dynzdf_imp_atsk ! vertical diffusion: implicit (dyn_zdf routine)
49	USE dynzdf_iso ! vertical diffusion: isopycnal (dyn_zdf routine)
50	USE dynzdf_exp ! vertical diffusion: explicit (dyn_zdf_exp routine)
51	USE dynnxt ! time-stepping (dyn_nxt routine)
52
53	USE trabbc ! bottom boundary condition (tra_bbc routine)
54	USE trabbl ! bottom boundary layer (tra_bbl routine)
55	USE tradmp ! internal damping (tra_dmp routine)
56	USE traldf_bilapg ! lateral mixing (tra_ldf_bilapg routine)
57	USE traldf_bilap ! lateral mixing (tra_ldf_bilap routine)
58	USE traldf_iso ! lateral mixing (tra_ldf_iso routine)
59	USE traldf_iso_zps ! lateral mixing (tra_ldf_iso_zps routine)
60	USE traldf_lap ! lateral mixing (tra_ldf_lap routine)
61	USE traqsr ! solar radiation penetration (tra_qsr routine)
62	USE tranpc ! non-penetrative convection (tra_npc routine)
63	USE tranxt ! time-stepping (tra_nxt routine)
64	USE traadv_ctl ! advection scheme control (tra_adv_ctl routine)
65	USE traadv_cen2 ! 2nd order centered scheme (tra_adv_cen2 routine)
66	USE traadv_tvd ! TVD scheme (tra_adv_tvd routine)
67	USE traadv_muscl ! MUSCL scheme (tra_adv_muscl routine)
68	USE traadv_muscl2 ! MUSCL2 scheme (tra_adv_muscl2 routine)
69	USE cla ! cross land advection (tra_cla routine)
70	USE trazdf_exp ! vertical diffusion: explicit (tra_zdf_exp routine)
71	USE trazdf_imp ! vertical diffusion: implicit (tra_zdf_imp routine)
72	USE trazdf_iso ! vertical diffusion (tra_zdf_exp routine)
73	USE trazdf_iso_vopt ! vertical diffusion (tra_zdf_exp routine)
74	USE trasbc ! surface boundary condition (tra_sbc routine)
75
76	USE eosbn2 ! equation of state (eos_bn2 routine)
77
78	USE obc_par ! open boundary condition variables
79	USE obcdta ! open boundary condition data (obc_dta routine)
80	USE obcrst ! open boundary cond. restart (obc_rst routine)
81	USE obcrad ! open boundary cond. radiation (obc_rad routine)
82	USE obcspg ! open boundary cond spg (obc_spg routine)
83
84	USE divcur ! hor. divergence and curl (div & cur routines)
85	USE cla_div ! cross land: hor. divergence (div_cla routine)
86	USE wzvmod ! vertical velocity (wzv routine)
87
88	USE ldfslp ! iso-neutral slopes (ldf_slp routine)
89	USE ldfeiv ! eddy induced velocity coef. (ldf_eiv routine)
90
91	USE zdfbfr ! bottom friction (zdf_bfr routine)
92	USE zdftke ! TKE vertical mixing (zdf_tke routine)
93	USE zdfddm ! double diffusion mixing (zdf_ddm routine)
94	USE zdfevd ! enhanced vertical diffusion (zdf_evd routine)
95	USE zdfric ! Richardson vertical mixing (zdf_ric routine)
96	USE zdfmxl ! Mixed-layer depth (zdf_mxl routine)
97
98	USE zpshde ! partial step: hor. derivative (zps_hde routine)
99	USE ice_oce ! sea-ice variable
100	USE icestp ! sea-ice time-stepping (ice_stp routine)
101
102	USE diawri ! Standard run outputs (dia_wri routine)
103	USE trdicp ! Ocean momentum/tracers trends (trd_wri routine)
104	USE trdmld ! mixed-layer trends (trd_mld routine)
105	USE trdvor ! vorticity budget (trd_vor routine)
106	USE diagap ! hor. mean model-data gap (dia_gap routine)
107	USE diahdy ! dynamic height (dia_hdy routine)
108	USE diaptr ! poleward transports (dia_ptr routine)
109	USE diahth ! thermocline depth (dia_hth routine)
110	USE diafwb ! freshwater budget (dia_fwb routine)
111	USE diaspr ! suface pressure (rigid-lid) (dia_spr routine)
112	USE flo_oce ! floats variables
113	USE floats ! floats computation (flo_stp routine)
114
115	USE stpctl ! time stepping control (stp_ctl routine)
116	USE restart ! ocean restart (rst_wri routine)
117	USE cpl ! exchanges in coupled mode (cpl_stp routine)
118
119	IMPLICIT NONE
120	PRIVATE
121
122	!! * Routine accessibility
123	PUBLIC stp ! called by opa.F90
124
125	!! * Substitutions
126	# include "domzgr_substitute.h90"
127	# include "zdfddm_substitute.h90"
128	!!----------------------------------------------------------------------
129	!! OPA 9.0 , LODYC-IPSL (2003)
130	!!----------------------------------------------------------------------
131
132	CONTAINS
133
134	SUBROUTINE stp( kstp )
135	!!----------------------------------------------------------------------
136	!! * ROUTINE stp *
137	!!
138	!! ** Purpose : - Time stepping of OPA (momentum and active tracer eqs.)
139	!! - Time stepping of LIM (dynamic and thermodynamic eqs.)
140	!! - Tme stepping of TRC (passive tracer eqs.)
141	!!
142	!! ** Method : -1- Update forcings and data
143	!! -2- Update ocean physics
144	!! -3- Compute the t and s trends
145	!! -4- Update t and s
146	!! -5- Compute the momentum trends
147	!! -6- Update the horizontal velocity
148	!! -7- Compute the diagnostics variables (rd,N2, div,cur,w)
149	!! -8- Outputs and diagnostics
150	!!
151	!! History :
152	!! ! 91-03 () Original code
153	!! ! 91-11 (G. Madec)
154	!! ! 92-06 (M. Imbard) add a first output record
155	!! ! 96-04 (G. Madec) introduction of dynspg
156	!! ! 96-04 (M.A. Foujols) introduction of passive tracer
157	!! 8.0 ! 97-06 (G. Madec) new architecture of call
158	!! 8.2 ! 97-06 (G. Madec, M. Imbard, G. Roullet) free surface
159	!! 8.2 ! 99-02 (G. Madec, N. Grima) hpg implicit
160	!! 8.2 ! 00-07 (J-M Molines, M. Imbard) Open Bondary Conditions
161	!! 9.0 ! 02-06 (G. Madec) free form, suppress macro-tasking
162	!! " ! 04-08 (C. Talandier) New trends organization
163	!!----------------------------------------------------------------------
164	!! * Arguments
165	INTEGER, INTENT( in ) :: kstp ! ocean time-step index
166
167	!! * local declarations
168	INTEGER :: indic ! error indicator if < 0
169	!! ---------------------------------------------------------------------
170
171	indic = 1 ! reset to no error condition
172	adatrj = adatrj + rdt/86400._wp
173
174	CALL day( kstp ) ! Calendar
175
176	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
177	! Update data, open boundaries and Forcings
178	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
179
180	IF( lk_dtatem ) CALL dta_tem( kstp ) ! update 3D temperature data
181
182	IF( lk_dtasal ) CALL dta_sal( kstp ) ! Salinity data
183
184	IF( lk_dtasst ) CALL dta_sst( kstp ) ! Sea Surface Temperature data
185
186	IF( lk_obc ) CALL obc_dta( kstp ) ! update dynamic and tracer data at open boundaries
187
188	IF( lk_obc ) CALL obc_rad( kstp ) ! compute phase velocities at open boundaries
189
190	CALL tau( kstp ) ! wind stress
191
192	CALL flx_rnf( kstp ) ! runoff data
193
194	CALL flx( kstp ) ! heat and freshwater fluxes
195
196	IF( lk_ice_lim ) CALL ice_stp( kstp ) ! sea-ice model (Update stress & fluxes)
197
198	CALL oce_sbc( kstp ) ! ocean surface boudaries
199
200	IF( ln_fwb ) CALL flx_fwb( kstp ) ! freshwater budget
201
202	IF( nclosea == 1 ) CALL flx_clo( kstp ) ! closed sea in the domain (update freshwater fluxes)
203
204	IF( kstp == nit000 ) THEN
205	IF( ninist == 1 ) THEN ! Output the initial state and forcings
206	CALL dia_wri_state( 'output.init' )
207	ENDIF
208	ENDIF
209
210	IF(l_ctl) THEN ! print mean trends (used for debugging)
211	WRITE(numout,) ' emp - : ', SUM( emp (1:nictl+1,1:njctl+1) tmask(1:nictl+1,1:njctl+1,1) )
212	WRITE(numout,) ' emps - : ', SUM( emps (1:nictl+1,1:njctl+1) tmask(1:nictl+1,1:njctl+1,1) )
213	WRITE(numout,) ' qt - : ', SUM( qt (1:nictl+1,1:njctl+1) tmask(1:nictl+1,1:njctl+1,1) )
214	WRITE(numout,) ' qsr - : ', SUM( qsr (1:nictl+1,1:njctl+1) tmask(1:nictl+1,1:njctl+1,1) )
215	WRITE(numout,) ' runoff : ', SUM( runoff(1:nictl+1,1:njctl+1) tmask(1:nictl+1,1:njctl+1,1) )
216	WRITE(numout,*) ' tmask : ', SUM( tmask (1:nictl+1,1:njctl+1,:) )
217	WRITE(numout,) ' sst - : ', SUM( tn (1:nictl+1,1:njctl+1,1) tmask(1:nictl+1,1:njctl+1,1) )
218	WRITE(numout,) ' sss - : ', SUM( sn (1:nictl+1,1:njctl+1,1) tmask(1:nictl+1,1:njctl+1,1) )
219	WRITE(numout,*) ' tau - x : ', SUM( taux (1:nictl+1,1:njctl+1) ), ' - y : ', SUM( tauy(1:nictl+1,1:njctl+1) )
220	ENDIF
221
222
223	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
224	! Ocean physics update
225	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
226	!-----------------------------------------------------------------------
227	! VERTICAL PHYSICS
228	!-----------------------------------------------------------------------
229	! N.B. ua, va, ta, sa arrays are used as workspace in this section
230	!-----------------------------------------------------------------------
231
232	CALL bn2( tb, sb, rn2 ) ! before Brunt-Vaisala frequency
233
234	! ! Vertical eddy viscosity and diffusivity coefficients
235	IF( lk_zdfric ) CALL zdf_ric( kstp ) ! Richardson number dependent Kz
236	IF( lk_zdftke ) CALL zdf_tke( kstp ) ! TKE closure scheme for Kz
237	IF( lk_zdfcst ) avt (:,:,:) = avt0 * tmask(:,:,:) ! Constant Kz (reset avt to the background value)
238
239	IF( cp_cfg == "orca" ) THEN ! ORCA: Reduce vertical mixing in some specific areas
240	SELECT CASE ( jp_cfg )
241	CASE ( 05 ) ! ORCA R2 configuration
242	avt (:,:,2) = avt (:,:,2) + 1.e-3 * upsrnfh(:,:) ! increase diffusivity of rivers mouths
243	END SELECT
244	ENDIF
245
246	IF( ln_zdfevd ) CALL zdf_evd( kstp ) ! enhanced vertical eddy diffusivity
247
248	IF( lk_zdfddm ) CALL zdf_ddm( kstp ) ! double diffusive mixing
249
250	CALL zdf_bfr( kstp ) ! bottom friction
251
252	CALL zdf_mxl( kstp ) ! mixed layer depth
253
254
255	!-----------------------------------------------------------------------
256	! LATERAL PHYSICS
257	!-----------------------------------------------------------------------
258	! N.B. ua, va, ta, sa arrays are used as workspace in this section
259	!-----------------------------------------------------------------------
260
261	IF( lk_ldfslp ) CALL ldf_slp( kstp, rhd, rn2 ) ! before slope of the lateral mixing
262
263	#if defined key_traldf_c2d
264	IF( lk_traldf_eiv ) CALL ldf_eiv( kstp ) ! eddy induced velocity coefficient
265	#endif
266
267
268	#if defined key_passivetrc
269	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
270	! Passive Tracer Model
271	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
272	! N.B. ua, va, ta, sa arrays are used as workspace in this section
273	!-----------------------------------------------------------------------
274	IF( kstp == nit000 ) CALL trcdia( kstp, indic ) ! diagnostics init.
275
276	CALL trc_stp( kstp ) ! time-stepping
277
278	CALL trcwri( kstp ) ! outputs
279
280	CALL trcdia( kstp, indic ) ! diagnostics
281	#endif
282
283
284	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
285	! Active tracers
286	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
287	! N.B. ua, va arrays are used as workspace in this section
288	!-----------------------------------------------------------------------
289
290	ta(:,:,:) = 0.e0 ! set tracer trends to zero
291	sa(:,:,:) = 0.e0
292
293	CALL tra_sbc( kstp ) ! surface boundary condition
294
295	IF( ln_traqsr ) CALL tra_qsr( kstp ) ! penetrative solar radiation qsr
296
297	IF( lk_trabbc ) CALL tra_bbc( kstp ) ! bottom heat flux
298
299	IF( lk_trabbl_dif ) CALL tra_bbl_dif( kstp ) ! diffusive bottom boundary layer scheme
300	IF( lk_trabbl_adv ) CALL tra_bbl_adv( kstp ) ! advective (and/or diffusive) bottom boundary layer scheme
301
302	IF( lk_tradmp ) CALL tra_dmp( kstp ) ! internal damping trends
303
304	! ! horizontal & vertical advection
305	IF( kstp == nit000 ) CALL tra_adv_ctl ! chose/control the scheme used
306	IF( ln_traadv_cen2 ) CALL tra_adv_cen2 ( kstp ) ! 2nd order centered scheme
307	IF( ln_traadv_tvd ) CALL tra_adv_tvd ( kstp ) ! TVD scheme
308	IF( ln_traadv_muscl ) CALL tra_adv_muscl ( kstp ) ! MUSCL scheme
309	IF( ln_traadv_muscl2 ) CALL tra_adv_muscl2( kstp ) ! MUSCL2 scheme
310
311	IF( n_cla == 1 ) CALL tra_cla( kstp ) ! Cross Land Advection (Update Hor. advection)
312
313	! ! lateral mixing
314	IF( l_traldf_lap ) CALL tra_ldf_lap ( kstp ) ! iso-level laplacian
315	IF( l_traldf_bilap ) CALL tra_ldf_bilap ( kstp ) ! iso-level bilaplacian
316	IF( l_traldf_bilapg ) CALL tra_ldf_bilapg ( kstp ) ! s-coord. horizontal bilaplacian
317	IF( l_traldf_iso ) CALL tra_ldf_iso ( kstp ) ! iso-neutral/geopot. laplacian
318	IF( l_traldf_iso_zps ) CALL tra_ldf_iso_zps( kstp ) ! partial step iso-neutral/geopot. laplacian
319
320	! ! vertical diffusion
321	IF( l_trazdf_exp ) CALL tra_zdf_exp ( kstp ) ! explicit time stepping (time splitting scheme)
322	IF( l_trazdf_imp ) CALL tra_zdf_imp ( kstp ) ! implicit time stepping (euler backward)
323	IF( l_trazdf_iso ) CALL tra_zdf_iso ( kstp ) ! isopycnal
324	IF( l_trazdf_iso_vo ) CALL tra_zdf_iso_vopt( kstp ) ! vector opt. isopycnal
325
326	CALL tra_nxt( kstp ) ! tracer fields at next time step
327
328	IF( ln_zdfnpc ) CALL tra_npc( kstp ) ! update the new (t,s) fields by non
329	! ! penetrative convective adjustment
330
331	IF( ln_dynhpg_imp ) THEN ! semi-implicit hpg
332	CALL eos( ta, sa, rhd, rhop ) ! Time-filtered in situ density used in dynhpg module
333	IF( lk_zps ) CALL zps_hde( kstp, ta, sa, rhd, & ! Partial steps: time filtered hor. gradient
334	& gtu, gsu, gru, & ! of t, s, rd at the bottom ocean level
335	& gtv, gsv, grv )
336	ELSE ! centered hpg (default case)
337	CALL eos( tb, sb, rhd, rhop ) ! now (swap=before) in situ density for dynhpg module
338	IF( lk_zps ) CALL zps_hde( kstp, tb, sb, rhd, & ! Partial steps: now horizontal gradient
339	& gtu, gsu, gru, & ! of t, s, rd at the bottom ocean level
340	& gtv, gsv, grv )
341	ENDIF
342
343	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
344	! Dynamics
345	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
346	! N.B. ta, sa arrays are used as workspace in this section
347	!-----------------------------------------------------------------------
348
349	ua(:,:,:) = 0.e0 ! set dynamics trends to zero
350	va(:,:,:) = 0.e0
351
352	CALL dyn_keg( kstp ) ! horizontal gradient of kinetic energy
353
354	! ! vorticity term including Coriolis
355	IF( kstp == nit000 ) CALL dyn_vor_ctl ! chose/control the scheme used
356	IF( ln_dynvor_ens ) CALL dyn_vor_enstrophy( kstp ) ! enstrophy conserving scheme
357	IF( ln_dynvor_ene ) CALL dyn_vor_energy ( kstp ) ! energy conserving scheme
358	IF( ln_dynvor_mix ) CALL dyn_vor_mixed ( kstp ) ! mixed energy/enstrophy conserving scheme
359	IF( ln_dynvor_een ) CALL dyn_vor_ene_ens ( kstp ) ! combined energy/enstrophy conserving scheme
360
361	! ! lateral mixing
362	IF( l_dynldf_lap ) CALL dyn_ldf_lap ( kstp ) ! iso-level laplacian
363	IF( l_dynldf_bilap ) CALL dyn_ldf_bilap ( kstp ) ! iso-level bilaplacian
364	IF( l_dynldf_bilapg ) CALL dyn_ldf_bilapg ( kstp ) ! s-coord. horizontal bilaplacian
365	IF( l_dynldf_iso ) CALL dyn_ldf_iso ( kstp ) ! iso-neutral laplacian
366
367	! ! horizontal gradient of Hydrostatic pressure
368	IF( lk_dynhpg ) CALL dyn_hpg ( kstp ) ! default case (k-j-i loop)
369	IF( lk_dynhpg_tsk ) CALL dyn_hpg_atsk( kstp ) ! autatask case (j-k-i loop)
370
371	CALL dyn_zad ( kstp ) ! vertical advection
372
373	! ! vertical diffusion
374	IF( l_dynzdf_exp ) CALL dyn_zdf_exp ( kstp ) ! explicit time stepping (time splitting scheme)
375	IF( l_dynzdf_imp ) CALL dyn_zdf_imp ( kstp ) ! implicit time stepping (euler backward)
376	IF( l_dynzdf_imp_tsk ) CALL dyn_zdf_imp_tsk( kstp ) ! autotask implicit time stepping (euler backward)
377	IF( l_dynzdf_iso ) CALL dyn_zdf_iso ( kstp ) ! iso-neutral case
378
379	IF( lk_dynspg_rl ) THEN
380	IF( lk_obc ) CALL obc_spg( kstp ) ! surface pressure gradient at open boundaries
381	ENDIF
382	indic=0
383	!i bug lbc sur emp
384	CALL lbc_lnk( emp, 'T', 1. )
385	!i
386	! ! surface pressure gradient
387	IF( lk_dynspg_fsc ) CALL dyn_spg_fsc ( kstp, indic ) ! free surface constant volume case
388	IF( lk_dynspg_fsc_tsk ) CALL dyn_spg_fsc_atsk( kstp, indic ) ! autotask free surface constant volume case
389	IF( lk_dynspg_rl ) CALL dyn_spg_rl ( kstp, indic ) ! rigid-lid case
390
391	CALL dyn_nxt( kstp ) ! lateral velocity at next time step
392
393
394	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
395	! Computation of diagnostic variables
396	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
397	! N.B. ua, va, ta, sa arrays are used as workspace in this section
398	!-----------------------------------------------------------------------
399
400	CALL oc_fz_pt ! ocean surface freezing temperature
401
402	CALL div_cur( kstp ) ! Horizontal divergence & Relative vorticity
403
404	IF( n_cla == 1 ) CALL div_cla( kstp ) ! Cross Land Advection (Update Hor. divergence)
405
406	CALL wzv( kstp ) ! Vertical velocity
407
408
409
410	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
411	! Control, diagnostics and outputs
412	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
413	! N.B. ua, va, ta, sa arrays are used as workspace in this section
414	!-----------------------------------------------------------------------
415
416	! ! Time loop: control and print
417	CALL stp_ctl( kstp, indic )
418	IF ( indic < 0 ) nstop = nstop + 1
419
420	IF ( nstop == 0 ) THEN
421	! ! Diagnostics:
422	IF( lk_floats ) CALL flo_stp( kstp ) ! drifting Floats
423	IF( lk_trddyn ) CALL trd_dwr( kstp ) ! trends: dynamics
424	IF( lk_trdtra ) CALL trd_twr( kstp ) ! trends: active tracers
425	IF( lk_trdmld ) CALL trd_mld( kstp ) ! trends: Mixed-layer
426	IF( lk_trdvor ) CALL trd_vor( kstp ) ! trends: vorticity budget
427	IF( lk_diaspr ) CALL dia_spr( kstp ) ! Surface pressure diagnostics
428	IF( lk_diahth ) CALL dia_hth( kstp ) ! Thermocline depth (20 degres isotherm depth)
429	IF( lk_diagap ) CALL dia_gap( kstp ) ! basin averaged diagnostics
430	IF( lk_diahdy ) CALL dia_hdy( kstp ) ! dynamical heigh diagnostics
431	IF( lk_diafwb ) CALL dia_fwb( kstp ) ! Fresh water budget diagnostics
432
433	IF( ln_diaptr .AND. ( kstp == nit000 .OR. MOD( kstp, nf_ptr ) == 0 ) ) &
434	CALL dia_ptr( kstp ) ! Poleward TRansports diagnostics
435
436	! ! save and outputs
437	CALL rst_write ( kstp ) ! ocean model: restart file output
438	IF( lk_obc ) CALL obc_rst_wri( kstp ) ! ocean model: open boundary restart file output
439	CALL dia_wri ( kstp, indic ) ! ocean model: outputs
440
441	ENDIF
442
443	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
444	! Coupled mode
445	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
446
447	IF( lk_cpl ) CALL cpl_stp( kstp ) ! coupled mode : field exchanges
448
449	END SUBROUTINE stp
450
451	!!======================================================================
452	END MODULE step

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