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source: trunk/NEMO/OPA_SRC/step.F90 @ 132

Last change on this file since 132 was 132, checked in by opalod, 20 years ago
CT : UPDATE082 : Finalization of the poleward transport diagnostics
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 26.3 KB

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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 ! ???
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	#if defined key_passivetrc
34	!!bug trcstp ! passive tracer time-stepping (trc_stp routine)
35	#endif
36
37	USE dynhpg ! hydrostatic pressure grad. (dyn_hpg routine)
38	USE dynhpg_atsk ! hydrostatic pressure grad. (dyn_hpg_atsk routine)
39	USE dynspg_fsc ! surface pressure gradient (dyn_spg_fsc routine)
40	USE dynspg_fsc_atsk ! surface pressure gradient (dyn_spgfsc_atsk routine)
41	USE dynspg_rl ! surface pressure gradient (dyn_spg_rl routine)
42	USE dynkeg ! kinetic energy gradient (dyn_keg routine)
43	USE dynvor ! vorticity term (dyn_vor_... routines)
44	USE dynzad ! vertical advection (dyn_adv routine)
45	USE dynldf_bilapg ! lateral mixing (dyn_ldf_bilapg routine)
46	USE dynldf_bilap ! lateral mixing (dyn_ldf_bilap routine)
47	USE dynldf_iso ! lateral mixing (dyn_ldf_iso routine)
48	USE dynldf_lap ! lateral mixing (dyn_ldf_lap routine)
49	USE dynzdf_imp ! vertical diffusion: implicit (dyn_zdf routine)
50	USE dynzdf_imp_atsk ! vertical diffusion: implicit (dyn_zdf routine)
51	USE dynzdf_iso ! vertical diffusion: isopycnal (dyn_zdf routine)
52	USE dynzdf_exp ! vertical diffusion: explicit (dyn_zdf_exp routine)
53	USE dynnxt ! time-stepping (dyn_nxt routine)
54
55	USE trabbc ! bottom boundary condition (tra_bbc routine)
56	USE trabbl ! bottom boundary layer (tra_bbl routine)
57	USE tradmp ! internal damping (tra_dmp routine)
58	USE traldf_bilapg ! lateral mixing (tra_ldf_bilapg routine)
59	USE traldf_bilap ! lateral mixing (tra_ldf_bilap routine)
60	USE traldf_iso ! lateral mixing (tra_ldf_iso routine)
61	USE traldf_iso_zps ! lateral mixing (tra_ldf_iso_zps routine)
62	USE traldf_lap ! lateral mixing (tra_ldf_lap routine)
63	USE traqsr ! solar radiation penetration (tra_qsr routine)
64	USE tranpc ! non-penetrative convection (tra_npc routine)
65	USE tranxt ! time-stepping (tra_nxt routine)
66	USE traadv_ctl ! advection scheme control (tra_adv_ctl routine)
67	USE traadv_cen2 ! 2nd order centered scheme (tra_adv_cen2 routine)
68	USE traadv_tvd ! TVD scheme (tra_adv_tvd routine)
69	USE traadv_muscl ! MUSCL scheme (tra_adv_muscl routine)
70	USE traadv_muscl2 ! MUSCL2 scheme (tra_adv_muscl2 routine)
71	USE cla ! cross land advection (tra_cla routine)
72	USE trazdf_exp ! vertical diffusion: explicit (tra_zdf_exp routine)
73	USE trazdf_imp ! vertical diffusion: implicit (tra_zdf_imp routine)
74	USE trazdf_iso ! vertical diffusion (tra_zdf_exp routine)
75	USE trazdf_iso_vopt ! vertical diffusion (tra_zdf_exp routine)
76	USE trasbc ! surface boundary condition (tra_sbc routine)
77
78	USE eosbn2 ! equation of state (eos_bn2 routine)
79
80	USE obc_par ! open boundary condition variables
81	USE obcdta ! open boundary condition data (obc_dta routine)
82	USE obcrst ! open boundary cond. restart (obc_rst routine)
83	USE obcrad ! open boundary cond. radiation (obc_rad routine)
84	USE obcspg ! open boundary cond spg (obc_spg routine)
85
86	USE divcur ! hor. divergence and curl (div & cur routines)
87	USE cla_div ! cross land: hor. divergence (div_cla routine)
88	USE wzvmod ! vertical velocity (wzv routine)
89
90	USE ldfslp ! iso-neutral slopes (ldf_slp routine)
91	USE ldfeiv ! eddy induced velocity coef. (ldf_eiv routine)
92
93	USE zdfbfr ! bottom friction (zdf_bfr routine)
94	USE zdftke ! TKE vertical mixing (zdf_tke routine)
95	USE zdfddm ! double diffusion mixing (zdf_ddm routine)
96	USE zdfevd ! enhanced vertical diffusion (zdf_evd routine)
97	USE zdfric ! Richardson vertical mixing (zdf_ric routine)
98	USE zdfmxl ! Mixed-layer depth (zdf_mxl routine)
99
100	USE zpshde ! partial step: hor. derivative (zps_hde routine)
101	USE ice_oce ! sea-ice variable
102	USE icestp ! sea-ice time-stepping (ice_stp routine)
103
104	USE diawri ! Standard run outputs (dia_wri routine)
105	USE trddyn ! Ocean momentum trends (trd_dyn routine)
106	USE trdtra ! Ocean active tracer trends (trd_tra routine)
107	USE diagap ! hor. mean model-data gap (dia_gap routine)
108	USE trdmld ! mixed-layer trends (trd_mld routine)
109	USE trdvor ! vorticity budget (trd_vor routine)
110	USE diahdy ! dynamic height (dia_hdy routine)
111	USE diaptr ! poleward transports (dia_ptr routine)
112	USE diahth ! thermocline depth (dia_hth routine)
113	USE diafwb ! freshwater budget (dia_fwb routine)
114	USE diaspr ! suface pressure (rigid-lid) (dia_spr routine)
115	USE flo_oce ! floats variables
116	USE floats ! floats computation (flo_stp routine)
117
118	USE stpctl ! time stepping control (stp_ctl routine)
119	USE restart ! ocean restart (rst_wri routine)
120	USE cpl ! exchanges in coupled mode (cpl_stp routine)
121
122	IMPLICIT NONE
123	PRIVATE
124
125	!! * Routine accessibility
126	PUBLIC stp ! called by opa.F90
127
128	!! * Substitutions
129	# include "domzgr_substitute.h90"
130	# include "zdfddm_substitute.h90"
131	!!----------------------------------------------------------------------
132	!! OPA 9.0 , LODYC-IPSL (2003)
133	!!----------------------------------------------------------------------
134
135	CONTAINS
136
137	SUBROUTINE stp( kstp )
138	!!----------------------------------------------------------------------
139	!! * ROUTINE stp *
140	!!
141	!! ** Purpose : - Time stepping of OPA (momentum and active tracer eqs.)
142	!! - Time stepping of LIM (dynamic and thermodynamic eqs.)
143	!! - Tme stepping of TRC (passive tracer eqs.)
144	!!
145	!! ** Method : -1- Update forcings and data
146	!! -2- Update ocean physics
147	!! -3- Compute the t and s trends
148	!! -4- Update t and s
149	!! -5- Compute the momentum trends
150	!! -6- Update the horizontal velocity
151	!! -7- Compute the diagnostics variables (rd,N2, div,cur,w)
152	!! -8- Outputs and diagnostics
153	!!
154	!! History :
155	!! ! 91-03 () Original code
156	!! ! 91-11 (G. Madec)
157	!! ! 92-06 (M. Imbard) add a first output record
158	!! ! 96-04 (G. Madec) introduction of dynspg
159	!! ! 96-04 (M.A. Foujols) introduction of passive tracer
160	!! 8.0 ! 97-06 (G. Madec) new architecture of call
161	!! 8.2 ! 97-06 (G. Madec, M. Imbard, G. Roullet) free surface
162	!! 8.2 ! 99-02 (G. Madec, N. Grima) hpg implicit
163	!! 8.2 ! 00-07 (J-M Molines, M. Imbard) Open Bondary Conditions
164	!! 9.0 ! 02-06 (G. Madec) free form, suppress macro-tasking
165	!!----------------------------------------------------------------------
166	!! * Arguments
167	INTEGER, INTENT( in ) :: kstp ! ocean time-step index
168
169	!! * local declarations
170	INTEGER :: indic ! error indicator if < 0
171	INTEGER :: ii0, ii1, ij0, ij1 ! temporary integers
172	!! ---------------------------------------------------------------------
173
174	indic = 1 ! reset to no error condition
175	adatrj = adatrj + rdt/86400._wp
176
177	CALL day( kstp ) ! Calendar
178
179	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
180	! Update data, open boundaries and Forcings
181	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
182
183	IF( lk_dtatem ) CALL dta_tem( kstp ) ! update 3D temperature data
184
185	IF( lk_dtasal ) CALL dta_sal( kstp ) ! Salinity data
186
187	IF( lk_dtasst ) CALL dta_sst( kstp ) ! Sea Surface Temperature data
188
189	IF( lk_obc ) CALL obc_dta( kstp ) ! update dynamic and tracer data at open boundaries
190
191	IF( lk_obc ) CALL obc_rad( kstp ) ! compute phase velocities at open boundaries
192
193	CALL tau( kstp ) ! wind stress
194
195	CALL flx_rnf( kstp ) ! runoff data
196
197	CALL flx( kstp ) ! heat and freshwater fluxes
198
199	IF( lk_ice_lim ) CALL ice_stp( kstp ) ! sea-ice model (Update stress & fluxes)
200
201	CALL oce_sbc( kstp ) ! ocean surface boudaries
202
203	IF( ln_fwb ) CALL flx_fwb( kstp ) ! freshwater budget
204
205	IF( nclosea == 1 ) CALL flx_clo( kstp ) ! closed sea in the domain (update freshwater fluxes)
206
207	IF( kstp == nit000 ) THEN
208	IF( ninist == 1 ) THEN ! Output the initial state and forcings
209	CALL dia_wri_state( 'output.init' )
210	ENDIF
211	ENDIF
212
213	IF(l_ctl) THEN ! print mean trends (used for debugging)
214	WRITE(numout,) ' emp - : ', SUM( emp (1:nictl+1,1:njctl+1) tmask(1:nictl+1,1:njctl+1,1) )
215	WRITE(numout,) ' emps - : ', SUM( emps (1:nictl+1,1:njctl+1) tmask(1:nictl+1,1:njctl+1,1) )
216	WRITE(numout,) ' qt - : ', SUM( qt (1:nictl+1,1:njctl+1) tmask(1:nictl+1,1:njctl+1,1) )
217	WRITE(numout,) ' qsr - : ', SUM( qsr (1:nictl+1,1:njctl+1) tmask(1:nictl+1,1:njctl+1,1) )
218	WRITE(numout,) ' runoff : ', SUM( runoff(1:nictl+1,1:njctl+1) tmask(1:nictl+1,1:njctl+1,1) )
219	WRITE(numout,*) ' tmask : ', SUM( tmask (1:nictl+1,1:njctl+1,:) )
220	WRITE(numout,) ' sst - : ', SUM( tn (1:nictl+1,1:njctl+1,1) tmask(1:nictl+1,1:njctl+1,1) )
221	WRITE(numout,) ' sss - : ', SUM( sn (1:nictl+1,1:njctl+1,1) tmask(1:nictl+1,1:njctl+1,1) )
222	WRITE(numout,*) ' tau - x : ', SUM( taux (1:nictl+1,1:njctl+1) ), ' - y : ', SUM( tauy(1:nictl+1,1:njctl+1) )
223	ENDIF
224
225
226	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
227	! Ocean physics update
228	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
229	!-----------------------------------------------------------------------
230	! VERTICAL PHYSICS
231	!-----------------------------------------------------------------------
232	! N.B. ua, va, ta, sa arrays are used as workspace in this section
233	!-----------------------------------------------------------------------
234
235	CALL bn2( tb, sb, rn2 ) ! before Brunt-Vaisala frequency
236
237	! ! Vertical eddy viscosity and diffusivity coefficients
238	IF( lk_zdfric ) CALL zdf_ric( kstp ) ! Richardson number dependent Kz
239	IF( lk_zdftke ) CALL zdf_tke( kstp ) ! TKE closure scheme for Kz
240	IF( lk_zdfcst ) avt (:,:,:) = avt0 * tmask(:,:,:) ! Constant Kz (reset avt to the background value)
241
242	IF( cp_cfg == "orca" ) THEN ! ORCA: Reduce vertical mixing in some straits
243	SELECT CASE ( jp_cfg )
244	CASE ( 05 ) ! ORCA R2 configuration
245	avt (:,:,2) = avt (:,:,2) + 1.e-3 * upsrnfh(:,:) ! increase diffusivity of rivers mouths
246	CASE ( 2 ) ! ORCA R2 configuration
247	ij0 = 102 ; ij1 = 102 ; ii0 = 140 ; ii1 = 140
248	avt( mi0(ii0):mi1(ii1) , mj0(ij0):mj1(ij1) , 2:jpkm1 ) = & ! Strait of Gibraltar
249	avt( mi0(ii0):mi1(ii1) , mj0(ij0):mj1(ij1) , 2:jpkm1 ) / 5.e0
250	ij0 = 88 ; ij1 = 88 ; ii0 = 161 ; ii1 = 161
251	avt( mi0(ii0):mi1(ii1) , mj0(ij0):mj1(ij1) , 2:jpkm1 ) = & ! Strait of Bab el Mandeb
252	avt( mi0(ii0):mi1(ii1) , mj0(ij0):mj1(ij1) , 2:jpkm1 ) / 5.e0
253	CASE ( 4 ) ! ORCA R4 configuration
254	ij0 = 52 ; ij1 = 52 ; ii0 = 71 ; ii1 = 71
255	avt( mi0(ii0):mi1(ii1) , mj0(ij0):mj1(ij1) , 2:jpkm1 ) = & ! Strait of Gibraltar
256	avt( mi0(ii0):mi1(ii1) , mj0(ij0):mj1(ij1) , 2:jpkm1 ) / 5.e0
257	END SELECT
258	ENDIF
259
260	IF( ln_zdfevd ) CALL zdf_evd( kstp ) ! enhanced vertical eddy diffusivity
261
262	IF( lk_zdfddm ) CALL zdf_ddm( kstp ) ! double diffusive mixing
263
264	CALL zdf_bfr( kstp ) ! bottom friction
265
266	CALL zdf_mxl( kstp ) ! mixed layer depth
267
268
269	!-----------------------------------------------------------------------
270	! LATERAL PHYSICS
271	!-----------------------------------------------------------------------
272	! N.B. ua, va, ta, sa arrays are used as workspace in this section
273	!-----------------------------------------------------------------------
274
275	IF( lk_ldfslp ) CALL ldf_slp( kstp, rhd, rn2 ) ! before slope of the lateral mixing
276
277	#if defined key_traldf_c2d
278	IF( lk_traldf_eiv ) CALL ldf_eiv( kstp ) ! eddy induced velocity coefficient
279	#endif
280
281
282	#if defined key_passivetrc
283	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
284	! Passive Tracer Model
285	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
286	! N.B. ua, va, ta, sa arrays are used as workspace in this section
287	!-----------------------------------------------------------------------
288	IF( kstp == nit000 ) CALL trcdia( kstp, indic ) ! diagnostics init.
289
290	CALL trc_stp( kstp ) ! time-stepping
291
292	CALL trcwri( kstp ) ! outputs
293
294	CALL trcdia( kstp, indic ) ! diagnostics
295	#endif
296
297
298	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
299	! Active tracers
300	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
301	! N.B. ua, va arrays are used as workspace in this section
302	!-----------------------------------------------------------------------
303
304	ta(:,:,:) = 0.e0 ! set tracer trends to zero
305	sa(:,:,:) = 0.e0
306
307	CALL tra_sbc( kstp ) ! surface boundary condition
308
309	IF( ln_traqsr ) CALL tra_qsr( kstp ) ! penetrative solar radiation qsr
310
311	IF( lk_trabbc ) CALL tra_bbc( kstp ) ! bottom heat flux
312
313	IF( lk_trabbl_dif ) CALL tra_bbl_dif( kstp ) ! diffusive bottom boundary layer scheme
314	IF( lk_trabbl_adv ) CALL tra_bbl_adv( kstp ) ! advective (and/or diffusive) bottom boundary layer scheme
315
316	IF( lk_tradmp ) CALL tra_dmp( kstp ) ! internal damping trends
317
318	! ! horizontal & vertical advection
319	IF( kstp == nit000 ) CALL tra_adv_ctl ! chose/control the scheme used
320	IF( ln_traadv_cen2 ) CALL tra_adv_cen2 ( kstp ) ! 2nd order centered scheme
321	IF( ln_traadv_tvd ) CALL tra_adv_tvd ( kstp ) ! TVD scheme
322	IF( ln_traadv_muscl ) CALL tra_adv_muscl ( kstp ) ! MUSCL scheme
323	IF( ln_traadv_muscl2 ) CALL tra_adv_muscl2( kstp ) ! MUSCL2 scheme
324
325	IF( n_cla == 1 ) CALL tra_cla( kstp ) ! Cross Land Advection (Update Hor. advection)
326
327	! ! lateral mixing
328	IF( l_traldf_lap ) CALL tra_ldf_lap ( kstp ) ! iso-level laplacian
329	IF( l_traldf_bilap ) CALL tra_ldf_bilap ( kstp ) ! iso-level bilaplacian
330	IF( l_traldf_bilapg ) CALL tra_ldf_bilapg ( kstp ) ! s-coord. horizontal bilaplacian
331	IF( l_traldf_iso ) CALL tra_ldf_iso ( kstp ) ! iso-neutral/geopot. laplacian
332	IF( l_traldf_iso_zps ) CALL tra_ldf_iso_zps( kstp ) ! partial step iso-neutral/geopot. laplacian
333
334	! ! vertical diffusion
335	IF( l_trazdf_exp ) CALL tra_zdf_exp ( kstp ) ! explicit time stepping (time splitting scheme)
336	IF( l_trazdf_imp ) CALL tra_zdf_imp ( kstp ) ! implicit time stepping (euler backward)
337	IF( l_trazdf_iso ) CALL tra_zdf_iso ( kstp ) ! isopycnal
338	IF( l_trazdf_iso_vo ) CALL tra_zdf_iso_vopt( kstp ) ! vector opt. isopycnal
339
340	CALL tra_nxt( kstp ) ! tracer fields at next time step
341
342	IF( ln_zdfnpc ) CALL tra_npc( kstp ) ! update the new (t,s) fields by non
343	! ! penetrative convective adjustment
344
345	IF( ln_dynhpg_imp ) THEN ! semi-implicit hpg
346	CALL eos( ta, sa, rhd, rhop ) ! Time-filtered in situ density used in dynhpg module
347	IF( lk_zps ) CALL zps_hde( kstp, ta, sa, rhd, & ! Partial steps: time filtered hor. gradient
348	& gtu, gsu, gru, & ! of t, s, rd at the bottom ocean level
349	& gtv, gsv, grv )
350	ELSE ! centered hpg (default case)
351	CALL eos( tb, sb, rhd, rhop ) ! now (swap=before) in situ density for dynhpg module
352	IF( lk_zps ) CALL zps_hde( kstp, tb, sb, rhd, & ! Partial steps: now horizontal gradient
353	& gtu, gsu, gru, & ! of t, s, rd at the bottom ocean level
354	& gtv, gsv, grv )
355	ENDIF
356
357	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
358	! Dynamics
359	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
360	! N.B. ta, sa arrays are used as workspace in this section
361	!-----------------------------------------------------------------------
362
363	ua(:,:,:) = 0.e0 ! set dynamics trends to zero
364	va(:,:,:) = 0.e0
365
366	CALL dyn_keg( kstp ) ! horizontal gradient of kinetic energy
367
368	! ! vorticity term including Coriolis
369	IF( kstp == nit000 ) CALL dyn_vor_ctl ! chose/control the scheme used
370	IF( ln_dynvor_ens ) CALL dyn_vor_enstrophy( kstp ) ! enstrophy conserving scheme
371	IF( ln_dynvor_ene ) CALL dyn_vor_energy ( kstp ) ! energy conserving scheme
372	IF( ln_dynvor_mix ) CALL dyn_vor_mixed ( kstp ) ! mixed energy/enstrophy conserving scheme
373	IF( ln_dynvor_een ) CALL dyn_vor_ene_ens ( kstp ) ! combined energy/enstrophy conserving scheme
374
375	! ! lateral mixing
376	IF( l_dynldf_lap ) CALL dyn_ldf_lap ( kstp ) ! iso-level laplacian
377	IF( l_dynldf_bilap ) CALL dyn_ldf_bilap ( kstp ) ! iso-level bilaplacian
378	IF( l_dynldf_bilapg ) CALL dyn_ldf_bilapg ( kstp ) ! s-coord. horizontal bilaplacian
379	IF( l_dynldf_iso ) CALL dyn_ldf_iso ( kstp ) ! iso-neutral laplacian
380
381	! ! horizontal gradient of Hydrostatic pressure
382	IF( lk_dynhpg ) CALL dyn_hpg ( kstp ) ! default case (k-j-i loop)
383	IF( lk_dynhpg_tsk ) CALL dyn_hpg_atsk( kstp ) ! autatask case (j-k-i loop)
384
385	CALL dyn_zad ( kstp ) ! vertical advection
386
387	! ! vertical diffusion
388	IF( l_dynzdf_exp ) CALL dyn_zdf_exp ( kstp ) ! explicit time stepping (time splitting scheme)
389	IF( l_dynzdf_imp ) CALL dyn_zdf_imp ( kstp ) ! implicit time stepping (euler backward)
390	IF( l_dynzdf_imp_tsk ) CALL dyn_zdf_imp_tsk( kstp ) ! autotask implicit time stepping (euler backward)
391	IF( l_dynzdf_iso ) CALL dyn_zdf_iso ( kstp ) ! iso-neutral case
392
393	IF( lk_dynspg_rl ) THEN
394	IF( lk_obc ) CALL obc_spg( kstp ) ! surface pressure gradient at open boundaries
395	ENDIF
396	indic=0
397	!i bug lbc sur emp
398	CALL lbc_lnk( emp, 'T', 1. )
399	!i
400	! ! surface pressure gradient
401	IF( lk_dynspg_fsc ) CALL dyn_spg_fsc ( kstp, indic ) ! free surface constant volume case
402	IF( lk_dynspg_fsc_tsk ) CALL dyn_spg_fsc_atsk( kstp, indic ) ! autotask free surface constant volume case
403	IF( lk_dynspg_rl ) CALL dyn_spg_rl ( kstp, indic ) ! rigid-lid case
404
405	CALL dyn_nxt( kstp ) ! lateral velocity at next time step
406
407
408	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
409	! Computation of diagnostic variables
410	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
411	! N.B. ua, va, ta, sa arrays are used as workspace in this section
412	!-----------------------------------------------------------------------
413
414	CALL oc_fz_pt ! ocean surface freezing temperature
415
416	CALL div_cur( kstp ) ! Horizontal divergence & Relative vorticity
417
418	IF( n_cla == 1 ) CALL div_cla( kstp ) ! Cross Land Advection (Update Hor. divergence)
419
420	CALL wzv( kstp ) ! Vertical velocity
421
422
423
424	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
425	! Control, diagnostics and outputs
426	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
427	! N.B. ua, va, ta, sa arrays are used as workspace in this section
428	!-----------------------------------------------------------------------
429
430	! ! Time loop: control and print
431	CALL stp_ctl( kstp, indic )
432	IF ( indic < 0 ) nstop = nstop + 1
433
434	IF ( nstop == 0 ) THEN
435	! ! Diagnostics:
436	IF( lk_floats ) CALL flo_stp( kstp ) ! drifting Floats
437	IF( lk_trddyn ) CALL trd_dyn( kstp ) ! trends: dynamics
438	IF( lk_trdtra ) CALL trd_tra( kstp ) ! trends: active tracers
439	IF( lk_trdmld ) CALL trd_mld( kstp ) ! trends: Mixed-layer
440	IF( lk_trdvor ) CALL trd_vor( kstp ) ! trends: vorticity budget
441	IF( lk_diaspr ) CALL dia_spr( kstp ) ! Surface pressure diagnostics
442	IF( lk_diahth ) CALL dia_hth( kstp ) ! Thermocline depth (20 degres isotherm depth)
443	IF( lk_diagap ) CALL dia_gap( kstp ) ! basin averaged diagnostics
444	IF( lk_diahdy ) CALL dia_hdy( kstp ) ! dynamical heigh diagnostics
445	IF( lk_diafwb ) CALL dia_fwb( kstp ) ! Fresh water budget diagnostics
446
447	IF( ln_diaptr .AND. ( kstp == nit000 .OR. MOD( kstp, nf_ptr ) == 0 ) ) &
448	CALL dia_ptr( kstp ) ! Poleward TRansports diagnostics
449
450	! ! save and outputs
451	CALL rst_write ( kstp ) ! ocean model: restart file output
452	IF( lk_obc ) CALL obc_rst_wri( kstp ) ! ocean model: open boundary restart file output
453	CALL dia_wri ( kstp, indic ) ! ocean model: outputs
454
455	ENDIF
456
457	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
458	! Coupled mode
459	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
460
461	IF( lk_cpl ) CALL cpl_stp( kstp ) ! coupled mode : field exchanges
462
463	END SUBROUTINE stp
464
465	!!======================================================================
466	END MODULE step

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