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cpl.F90 in trunk/NEMO/OPA_SRC – NEMO

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source: trunk/NEMO/OPA_SRC/cpl.F90 @ 83

Last change on this file since 83 was 83, checked in by opalod, 20 years ago
CT : UPDATE056 : Change the subroutine name cpl_step to cpl_stp
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 29.1 KB

Line
1	MODULE cpl
2	!!======================================================================
3	!! * MODULE cpl *
4	!! Coupled O/A : coupled ocean-atmosphere case using OASIS
5	!!=====================================================================
6	#if defined key_coupled
7	!!----------------------------------------------------------------------
8	!! 'key_coupled' coupled Ocean/Atmosphere
9	!!----------------------------------------------------------------------
10	!! cpl_init : initialization of coupled mode communication
11	!! cpl_read : read the coupled namelist
12	!! cpl_stp : exchange fields in coupled mode
13	!!----------------------------------------------------------------------
14	!! * Modules used
15	USE oce ! ocean dynamics and tracers
16	USE dom_oce ! ocean space and time domain
17	USE in_out_manager ! I/O manager
18	USE cpl_oce ! coupled exchange variables (???)
19	USE flx_oce ! in case of ice
20	USE ocfzpt ! ocean freezing point
21
22	IMPLICIT NONE
23	PRIVATE
24
25	!! Routine accessibility
26	PUBLIC cpl_init ! routine called in opa module
27	PUBLIC cpl_stp ! routine called in step module
28	!!----------------------------------------------------------------------
29	!! OPA 9.0 , LODYC-IPSL (2003)
30	!!----------------------------------------------------------------------
31
32	CONTAINS
33
34	SUBROUTINE cpl_init( kastp, kexch, kstep )
35	!!---------------------------------------------------------------------
36	!! * ROUTINE cpl_init *
37	!!
38	!! ** Purpose : Initialize coupled mode communication for ocean
39	!! exchange process identifiers and timestep information
40	!! between AGCM, OGCM and COUPLER. (OASIS software)
41	!!
42	!! ** Method : 3 types :
43	!! a) Use named pipes(FIFO) to exchange process identifiers
44	!! between the 3 programs
45	!! b) USE a messag passing method with PVM language (CLIM)
46	!! c) USE SVIPC method
47	!!
48	!! ** Input : npiat : agcm process identifier
49	!! npicp : coupler process identifier
50	!! npioc : ogcm process identifier
51	!!
52	!! Reference : see Epicoa 0803 (1992)
53	!!
54	!! History :
55	!! ! 92-09 (L. Terray) Original code
56	!! ! 96-07 (L. Terray) OASIS version 2
57	!! ! 96-11 (E. Guilyardi) run-off + Taux,Tauy x2
58	!! ! 98-04 (M.A Foujols, S. Valcke, M. Imbard) OASIS2.2
59	!! 8.5 ! 02-09 (G. Madec) F90: Free form and module
60	!!----------------------------------------------------------------------
61	!! * Arguments
62	INTEGER, INTENT(in ) :: &
63	kastp, & ! total number of timesteps in oceanic model
64	kexch, & ! frequency of exchange for the fluxes (in time steps)
65	kstep ! timestep value (in seconds)
66
67	!! * Local declarations
68	INTEGER,DIMENSION(3) :: iparal
69	INTEGER :: ifcpl, idt, info, imxtag, istep
70
71	CHARACTER (len=9) :: clpoolnam
72	INTEGER :: ipoolhandle, ipoolsize, index, jf
73	CHARACTER (len=3) :: cljobnam ! experiment name
74	INTEGER :: ierror
75	INTEGER,DIMENSION(4) :: imess, imesso
76	INTEGER :: getpid, mknod ! system functions
77	!!----------------------------------------------------------------------
78
79	IF(lwp) WRITE(numout,*)
80	IF(lwp) WRITE(numout,*) 'cpl_init : initialization in coupled ocean/atmosphere case'
81	IF(lwp) WRITE(numout,*) '~~~~~~~~'
82	IF(lwp) WRITE(numout,*)
83
84	#if defined key_flx_bulk_monthly \|\| defined key_flx_bulk_daily \|\| defined key_flx_forced_daily
85	IF(lwp)WRITE(numout,cform_err)
86	IF(lwp)WRITE(numout,*) ' key_coupled and key_flx_bulk_... are incompatible'
87	nstop = nstop + 1
88	#endif
89
90	IF(lwp)WRITE(numout,*)' coupled simulation'
91	IF(lwp)WRITE(numout,*)' unit ',numlhf,' receive atm fluxes'
92	IF(lwp)WRITE(numout,*)' unit ',numlws,' receive windstress'
93	IF(lwp)WRITE(numout,*)' unit ',numlts,' transfer sst'
94	IF(lwp)WRITE(numout,*)' unit ',numlic,' transfer ice cover'
95
96
97	CALL cpl_read ! read the coupled mode information in namelist
98
99	CALL flush(numout)
100
101	! I- PIPE
102	! --------
103	! W A R N I N G : PIPE technique is temporary diseable (nov. 2000)
104
105	IF( cchan == 'PIPE' ) THEN
106
107	IF(lwp) WRITE(numout,*)
108	IF(lwp) WRITE(numout,*) 'Making pipes for fields to receive from CPL'
109	IF(lwp) WRITE(numout,*)
110	CALL flush(numout)
111	ierror = 0
112
113	! loop to define pipes (CPL=atmos to ocean)
114
115	DO jf = 1, nflxc2o
116	! CALL PIPE_Model_Define( numout, cpl_readflx(jf), jpread, info )
117	IF( info /= 0 ) ierror = ierror + 1
118	END DO
119	DO jf = 1, ntauc2o
120	! CALL PIPE_Model_Define( numout, cpl_readtau(jf), jpread, info )
121	IF( info /= 0 ) ierror = ierror + 1
122	END DO
123
124	IF(lwp) WRITE(numout,*) ' '
125	IF(lwp) WRITE(numout,*) 'Making pipes for fields to send to CPL'
126	IF(lwp) WRITE(numout,*) ' '
127
128	! loop to define pipes (ocean to atmos=CPL)
129
130	DO jf = 1, nfldo2c
131	! CALL PIPE_Model_Define( numout, cpl_writ(jf), jpwrit, info )
132	IF( info /= 0 ) ierror = ierror + 1
133	END DO
134
135	IF( ierror /= 0 ) THEN
136	IF(lwp) WRITE(numout,*)
137	IF(lwp) WRITE(numout,*) 'cpl_init: end of job due to error in pipes definitions'
138	CALL abort
139	END IF
140
141	IF(lwp) WRITE(numout,*)
142	IF(lwp) WRITE(numout,*) 'All pipes have been made'
143
144	IF(lwp) WRITE(numout,*)
145	IF(lwp) WRITE(numout,*) 'Communication test between OCE and CPL'
146	CALL flush(numout)
147
148	! CALL PIPE_Model_Stepi(numout, imess, nmodcpl, imesso, ierror)
149
150	IF( ierror /= 0 ) THEN
151	IF(lwp) WRITE(numout,*)
152	IF(lwp) WRITE(numout,*) 'cpl_init: end of job due to error in exchange first informations with Oasis'
153	CALL abort
154	END IF
155
156	IF(lwp) WRITE(numout,*)
157	IF(lwp) WRITE(numout,*) 'Communication test between OCE and CPL is OK'
158	IF(lwp) WRITE(numout,*) ' total simulation time in oasis = ',imesso(1)
159	IF(lwp) WRITE(numout,*) ' total number of iterations is = ',imesso(2)
160	IF(lwp) WRITE(numout,*) ' value of oasis timestep is = ',imesso(3)
161	IF(lwp) WRITE(numout,*) ' process id for oasis is = ',imesso(4)
162	CALL flush(numout)
163
164	! II SVIPC
165	! ---------
166	! W A R N I N G : SVIPC technique is temporary diseable (nov. 2000)
167
168
169	ELSE IF( cchan == 'SIPC' ) THEN
170
171	! debug for more information
172
173	! CALL SVIPC_debug(1)
174
175	! Define the experiment name :
176
177	cljobnam = 'IPC' ! as $JOBNAM in namcouple
178
179	! Attach to shared memory pool used to exchange initial infos
180
181	info = 0
182	! CALL SIPC_Init_Model (cljobnam, cplmodnam, 1, info)
183	IF( info /= 0 ) THEN
184	IF(lwp) WRITE(numout,*)
185	IF(lwp) WRITE(numout,*)'WARNING: Problem with attachement to',info
186	IF(lwp) WRITE(numout,*)' initial memory pool(s) in ocean'
187	IF(lwp) WRITE(numout,*)
188	CALL abort('STOP in ocean')
189	ENDIF
190
191	! Attach to pools used to exchange fields from ocean to coupler
192
193	DO jf = 1, nfldo2c
194	! Pool name:
195	clpoolnam = 'P'//cpl_writ(jf)
196	! CALL SIPC_Attach(clpoolnam, ipoolhandle)
197	! Resulting pool handle:
198	mpoolwrit(jf) = ipoolhandle
199	END DO
200
201	! Attach to pools used to exchange fields from coupler to ocean
202
203	DO jf = 1, nflxc2o
204	! Pool name:
205	clpoolnam = 'P'//cpl_readflx(jf)
206	! CALL SIPC_Attach(clpoolnam, ipoolhandle)
207	! Resulting pool handle:
208	mpoolread(jf) = ipoolhandle
209	END DO
210
211	DO jf = 1, ntauc2o
212	! Pool name:
213	clpoolnam = 'P'//cpl_readtau(jf)
214	! CALL SIPC_Attach(clpoolnam, ipoolhandle)
215	! Resulting pool handle:
216	mpoolread(jf+nflxc2o) = ipoolhandle
217	END DO
218
219	! Exchange of initial infos
220
221	! Write data array isend to pool READ by Oasis
222
223	info = 0
224	ipoolsize = 4*jpbyteint
225	! CALL SVIPC_write(mpoolinitr, imess, ipoolsize, info)
226
227	! Find error if any
228
229	IF( info < 0 ) THEN
230	IF(lwp) WRITE(numout,*)
231	IF(lwp) WRITE(numout,*) 'Problem in ocean in writing initial'
232	IF(lwp) WRITE(numout,*) 'infos to the shared memory segment(s)'
233	IF(lwp) WRITE(numout,*)
234	ELSE
235	IF(lwp) WRITE(numout,*)
236	IF(lwp) WRITE(numout,*) 'Initial infos written in ocean'
237	IF(lwp) WRITE(numout,*) 'to the shared memory segment(s)'
238	IF(lwp) WRITE(numout,*)
239	ENDIF
240
241	! Read data array irecv from pool written by Oasis
242
243	info = 0
244	ipoolsize = 4 * jpbyteint
245	CALL svipc_read(mpoolinitw, imesso, ipoolsize, info)
246
247	! Find error if any
248
249	IF( info < 0 ) THEN
250	IF(lwp) WRITE(numout,*) ' '
251	IF(lwp) WRITE(numout,*) 'Problem in ocean in reading initial'
252	IF(lwp) WRITE(numout,*) 'infos from the shared memory segment(s)'
253	IF(lwp) WRITE(numout,*) ' '
254	ELSE
255	IF(lwp) WRITE(numout,*) ' '
256	IF(lwp) WRITE(numout,*) 'Initial infos read by ocean'
257	IF(lwp) WRITE(numout,*) 'from the shared memory segment(s)'
258	IF(lwp) WRITE(numout,*) ' '
259	IF(lwp) WRITE(numout,*) ' ntime, niter, nstep, Oasis pid:'
260	IF(lwp) WRITE(numout,*) imesso(1), imesso(2), imesso(3), imesso(4)
261	ENDIF
262
263	! Detach from shared memory segment(s)
264
265	info = 0
266	! CALL SVIPC_close(mpoolinitw, 0, info)
267
268	! Find error if any
269
270	IF( info < 0 ) THEN
271	IF(lwp) WRITE(numout,*) 'Problem in detaching from shared memory segment(s)'
272	IF(lwp) WRITE(numout,*) 'used by ocean to read initial infos'
273	ENDIF
274
275	! III CLIM
276	! --------
277
278	ELSE IF( cchan == 'CLIM' ) THEN
279
280	! Define the number of processors involved in the coupling for
281	! Oasis (=1) and each model (as last two INTEGER on $CHATYPE line
282	! in the namcouple); they will be stored in a COMMON in mpiclim.h
283	! (used for CLIM/MPI2 only)
284	mpi_nproc(0)=1
285	mpi_nproc(1)=1
286	mpi_nproc(2)=1
287
288	! Define the number of processors used by each model as in
289	! $CHATYPE line of namcouple (used for CLIM/MPI2 only)
290	mpi_totproc(1)=1
291	mpi_totproc(2)=1
292
293	! Define names of each model as in $NBMODEL line of namcouple
294	! (used for CLIM/MPI2 only)
295	cmpi_modnam(1)='lmdz.x'
296	cmpi_modnam(2)=cplmodnam
297	!
298	! 1.1-Define the experiment name :
299
300	cljobnam = 'CLI' ! as $JOBNAM in namcouple
301
302	OPEN ( UNIT = 7, FILE = 'trace', STATUS = 'unknown', FORM = 'formatted')
303	CALL clim_init ( cljobnam, cplmodnam, 3, 7, &
304	kastp, kexch, kstep, &
305	5, 3600, 3600, info )
306
307	IF( info /= clim_ok ) THEN
308	IF(lwp) WRITE( numout, *) 'cpl_init : pb init clim, error code is = ', info
309	CALL abort( 'STOP in cpl_init' )
310	ELSE
311	IF(lwp) WRITE(numout,*) 'cpl_init : init clim ok '
312	ENDIF
313
314	iparal ( clim_strategy ) = clim_serial
315	iparal ( clim_length ) = jpiglo*jpjglo
316	iparal ( clim_offset ) = 0
317
318	! loop to define messages (CPL=atmos to ocean)
319	DO jf = 1, nflxc2o
320	CALL CLIM_Define ( cpl_readflx(jf), clim_in, clim_double, iparal, info )
321	END DO
322	DO jf = 1, ntauc2o
323	CALL CLIM_Define ( cpl_readtau(jf), clim_in, clim_double, iparal, info )
324	END DO
325
326	! loop to define messages (ocean to CPL=atmos)
327	DO jf = 1, nfldo2c
328	CALL CLIM_Define ( cpl_writ(jf), clim_out, clim_double, iparal, info )
329	END DO
330
331	IF(lwp) WRITE(numout,*) 'cpl_init : clim_define ok '
332
333	CALL CLIM_Start( imxtag, info )
334
335	IF( info /= clim_ok ) THEN
336	IF(lwp) WRITE(numout,*) 'cpl_init : pb start clim, error code is = ', info
337	CALL abort( 'stop in cpl_init' )
338	ELSE
339	IF(lwp) WRITE(numout,*) 'cpl_init : start clim ok '
340	ENDIF
341
342	CALL CLIM_Stepi ( cploasis, istep, ifcpl, idt, info )
343
344	IF( info /= clim_ok ) THEN
345	IF(lwp) WRITE(numout,*) ' warning : problem in getting step info from oasis '
346	IF(lwp) WRITE(numout,*) ' ======= error code number = ', info
347	ELSE
348	IF(lwp) WRITE(numout,*) ' got step information from oasis '
349	ENDIF
350	IF(lwp) WRITE(numout,*) ' number of tstep in oasis ', istep
351	IF(lwp) WRITE(numout,*) ' exchange frequency in oasis ', ifcpl
352	IF(lwp) WRITE(numout,*) ' length of tstep in oasis ', idt
353	ENDIF
354
355	END SUBROUTINE cpl_init
356
357
358	SUBROUTINE cpl_read
359	!!---------------------------------------------------------------------
360	!! * ROUTINE cpl_read *
361	!!
362	!! ** Purpose : Read and print options for the coupled run (namelist)
363	!!
364	!! ** Method : ???
365	!!
366	!! History :
367	!! 8.5 ! 02-12 (G. Madec) F90: Free form and module
368	!!----------------------------------------------------------------------
369	!! * Local declarations
370	INTEGER :: jf
371
372	CHARACTER (len=21) :: clold, clfor, clseq
373	CHARACTER (len=32) :: clname
374
375	NAMELIST/namcpl/ nexco, cchan, nmodcpl, cplmodnam, cploasis &
376	, nfldo2c, nflxc2o, ntauc2o, cpl_f_readflx, cpl_f_readtau &
377	, cpl_f_writ, cpl_readflx, cpl_readtau, cpl_writ
378	!!----------------------------------------------------------------------
379
380	IF(lwp) WRITE(numout,*)
381	IF(lwp) WRITE(numout,*) ' cpl_read : read the coupled parameters in namelist'
382	IF(lwp) WRITE(numout,*) ' ~~~~~~~~'
383	IF(lwp) WRITE(numout,*)
384
385	! Default values
386
387	nexco = 24
388	cchan='PIPE' ! echange TYPE
389	nmodcpl = 2
390	cplmodnam = 'opa.xx' ! model name : as $NBMODEL in namcouple
391	cploasis = 'Oasis' ! coupler name : as in coupler
392
393	! -Define symbolic name for fields exchanged from ocean to coupler,
394	! must be the same as (1) of the field definition in namcouple:
395	nfldo2c=2
396	cpl_writ(1)='SOSSTSST'
397	cpl_writ(2)='SOICECOV'
398
399	! -Define files name for fields exchanged from ocean to coupler,
400	! must be the same as (6) of the field definition in namcouple:
401	nflxc2o=6
402	cpl_readflx(1)='SONSFLDO' ! non solar heat flux (positif vers l'ocean)
403	cpl_readflx(2)='SOSHFLDO' ! solar flux
404	cpl_readflx(3)='SOTOPRSU' ! precip
405	cpl_readflx(4)='SOTFSHSU' ! evaporation
406	cpl_readflx(5)='SORUNCOA' ! coastal run-off
407	cpl_readflx(6)='SORIVFLU' ! river run-off
408	ntauc2o=2
409	cpl_readtau(1)='SOZOTAUX' ! first zonal wind stress
410	cpl_readtau(2)='SOZOTAU2' ! second zonal wind stress
411	cpl_readtau(3)='SOMETAUY' ! first meridien wind stress
412	cpl_readtau(4)='SOMETAU2' ! second meridien wind stress
413
414	! -Define files name for fields exchanged from ocean to coupler,
415	! must be the same as (6) of the field definition in namcouple:
416	cpl_f_writ(1)='ocesst'
417	cpl_f_writ(2)='oceice'
418
419	! -Define files name for fields exchanged from coupler to ocean
420	! must be the same as (7) of the field definition in namcouple:
421	cpl_f_readflx(1)='oceflx'
422	cpl_f_readflx(2)='oceflx'
423	cpl_f_readflx(3)='oceflx'
424	cpl_f_readflx(4)='oceflx'
425	cpl_f_readflx(5)='oceflx'
426	cpl_f_readflx(6)='oceflx'
427	cpl_f_readtau(1)='ocetau'
428	cpl_f_readtau(2)='ocetau'
429	cpl_f_readtau(3)='ocetau'
430	cpl_f_readtau(4)='ocetau'
431
432	! Namelist namcpl : coupling mode and frequency
433	REWIND( numnam )
434	READ ( numnam, namcpl )
435
436	IF(lwp) THEN
437	WRITE(numout,*) 'namcpl'
438	WRITE(numout,*)
439	WRITE(numout,*) ' Coupling exchange frequency nexco = ',nexco
440	WRITE(numout,*) ' Coupling exchange technique cchan = ',cchan
441	WRITE(numout,*) ' Mode Coupling technique nmodcpl = ',nmodcpl
442	WRITE(numout,*) ' Define the model name cplmodnam = ',cplmodnam
443	WRITE(numout,*) ' Define the coupler name cploasis = ',cploasis
444	WRITE(numout,*) ' Fields number ocean to coupler nfldo2c= ',nfldo2c
445	WRITE(numout,*) ' Flux fields coupler to ocean nflxc2o = ',nflxc2o
446	WRITE(numout,*) ' Stress fields coupler to ocean ntauc2o= ',ntauc2o
447	IF ( cchan == 'PIPE' .OR. cchan == 'pipe' ) THEN
448	cchan='PIPE'
449	WRITE(numout,*)'(communication between models made by pipes)'
450	ELSEIF( cchan == 'CLIM' .OR. cchan == 'clim' ) THEN
451	cchan='CLIM'
452	WRITE(numout,*)'(communication between models made by CLIM-PVM)'
453	ELSEIF( cchan == 'SIPC' .OR. cchan == 'sipc' ) THEN
454	cchan='SIPC'
455	WRITE(numout,*)'(communication between models made by the', &
456	'Share Memory Segment and Semaphore)'
457	ELSE
458	WRITE(numout,*) 'technic not yet implemented ',cchan
459	STOP 'in cpl_read'
460	ENDIF
461	DO jf = 1, nflxc2o
462	WRITE(numout,*) 'file to receive field number = ',jf,' ',cpl_f_readflx(jf)
463	END DO
464	DO jf = 1, ntauc2o
465	WRITE(numout,*) 'file to receive field number = ',jf,' ',cpl_f_readtau(jf)
466	END DO
467	DO jf = 1, nfldo2c
468	WRITE(numout,*) 'file to send field number = ',jf,' ',cpl_f_writ(jf)
469	END DO
470	WRITE(numout,*) ' fields received from coupler'
471	DO jf = 1, nflxc2o
472	WRITE(numout,*) 'symbolic name for field number = ',jf,' ',cpl_readflx(jf)
473	END DO
474	DO jf = 1, ntauc2o
475	WRITE(numout,*) 'symbolic name for field number = ',jf,' ',cpl_readtau(jf)
476	END DO
477	WRITE(numout,*) ' fields send to coupler'
478	DO jf = 1, nfldo2c
479	WRITE(numout,*) 'symbolic name for field number = ',jf,' ',cpl_writ(jf)
480	END DO
481	ENDIF
482
483	END SUBROUTINE cpl_read
484
485
486	SUBROUTINE cpl_stp( kt )
487	!!---------------------------------------------------------------------
488	!! * ROUTINE cpl_stp *
489	!! *****************
490	!! * OASIS routine *
491	!! *****************
492	!! ** Purpose : - At each coupling time-step,this routine sends fields
493	!! like sst or ice cover to the coupler.
494	!! - At each time-step computes time average values
495	!! - Specific treatment for the last time-step
496	!!
497	!! ** Method : 3 types available:
498	!! a) Use named pipes(FIFO) to exchange process identifiers
499	!! between the 3 programs
500	!! b) USE a messag passing method with PVM language (CLIM)
501	!! c) USE SVIPC method
502	!!
503	!! History :
504	!! ! 92-09 (L. Terray) Original code
505	!! ! 96-07 (L. Terray) OASIS version 2
506	!! ! 96-11 (E. Guilyardi) run-off + Taux,Tauy x2
507	!! ! 98-04 (M.A Foujols, S. Valcke, M. Imbard) OASIS2.2
508	!! 8.5 ! 02-06 (G. Madec) F90: Free form and module
509	!!----------------------------------------------------------------------
510	!! * modules used
511	USE ioipsl
512
513	!! * Arguments
514	INTEGER, INTENT( in ) :: kt ! ocean time-step
515
516	!! * Local declarations
517	INTEGER :: ji, jj, jn, jf ! dummy loop indexes
518	INTEGER :: icstep, info, ierror, isize
519	INTEGER :: iflmax, iunmax
520	INTEGER :: ifile(jpmaxfld), ifield(jpmaxfld)
521	CHARACTER (len=8) :: clfile(jpmaxfld)
522	LOGICAL :: llfind
523	REAL(wp), DIMENSION(jpiglo,jpjglo) :: &
524	zstoc, zieoc, zalboc, zticoc
525
526	! netcdf outputs
527
528	CHARACTER (len=80) :: clcplsnam
529	INTEGER, SAVE :: nhoridcs, nidcs, ndexcs(1)
530	LOGICAL, SAVE :: lfirsts = .TRUE.
531	REAL(wp) :: zjulian
532
533	! Additions for SVIPC
534
535	INTEGER :: index
536	INTEGER, DIMENSION(3) :: infos
537	CHARACTER (len=3) :: clmodinf ! Header or not
538	CHARACTER (len=3) :: cljobnam ! experiment name
539	!!----------------------------------------------------------------------
540
541	! coupled mode Ocean/Atmosphere
542
543	! 0. Initialization
544	! -----------------
545
546	isize = jpiglo * jpjglo
547
548	! First time step: ocean sst and ice sea-ice extend set to zero
549	IF( kt == nit000 ) THEN
550	sstoc(:,:) = 0.e0
551	sieoc(:,:) = 0.e0
552	alboc(:,:) = 0.e0
553	ticoc(:,:) = 0.e0
554
555	! initialisation for netcdf outputs
556	!
557	ndexcs(:) = 0
558	clcplsnam = "cpl_oce_sst"
559
560	! Compute julian date from starting date of the run
561	CALL ymds2ju( nyear, nmonth, nday, 0.e0, zjulian )
562	CALL histbeg(clcplsnam, jpiglo, glamt, jpjglo, gphit, &
563	1, jpiglo, 1, jpjglo, 0, &
564	zjulian, rdt, nhoridcs, nidcs)
565	! no vertical axis
566	DO jf = 1, nfldo2c
567	CALL histdef(nidcs, cpl_writ(jf),cpl_writ(jf),"-",jpi, &
568	jpj, nhoridcs, 1, 1, 1, -99, 32, "inst", rdt, rdt)
569	END DO
570	CALL histend(nidcs)
571	ENDIF
572
573	! 1. Cumulated sst and sea-ice extend
574	!------------------------------------
575
576	sstoc(:,:) = sstoc(:,:) + ( 1.0 - freeze(:,:) ) * ( tn(:,:,1) + rt0 )
577	sieoc(:,:) = sieoc(:,:) + freeze(:,:)
578
579	#if defined key_ice_lim
580	alboc(:,:) = alboc(:,:) + freeze(:,:) * alb_ice(:,:)
581	ticoc(:,:) = ticoc(:,:) + freeze(:,:) * tn_ice(:,:)
582	#else
583	alboc(:,:) = alboc(:,:) + freeze(:,:) * 0.8
584	ticoc(:,:) = ticoc(:,:) + freeze(:,:) * ( -10.e0 + rt0 )
585	#endif
586
587
588	! 2. Send coupling fields to OASIS
589	!---------------------------------
590
591	IF( MOD( kt, nexco ) == 0 ) THEN
592
593	! 2.1 Average : mean coupling fields
594	zstoc (:,:) = 0.e0
595	zieoc (:,:) = 0.e0
596	zalboc(:,:) = 0.e0
597	zticoc(:,:) = 0.e0
598	DO jj = 1, nlcj
599	DO ji = 1, nlci
600	zstoc (mig(ji),mjg(jj)) = sstoc(ji,jj) / FLOAT( nexco )
601	zieoc (mig(ji),mjg(jj)) = sieoc(ji,jj) / FLOAT( nexco )
602	zalboc(mig(ji),mjg(jj)) = alboc(ji,jj) / FLOAT( nexco )
603	zticoc(mig(ji),mjg(jj)) = ticoc(ji,jj) / FLOAT( nexco )
604	END DO
605	END DO
606	icstep = kt - nit000 + 1
607
608	WRITE(numout,*)
609	WRITE(numout,*) 'STEP: Send fields to CPL with kt= ', kt
610	WRITE(numout,*)
611
612	! outputs
613
614	CALL histwrite( nidcs, cpl_writ(1), kt, zstoc , jpi*jpj, ndexcs )
615	CALL histwrite( nidcs, cpl_writ(2), kt, zieoc , jpi*jpj, ndexcs )
616	CALL histwrite( nidcs, cpl_writ(3), kt, zalboc, jpi*jpj, ndexcs )
617	CALL histwrite( nidcs, cpl_writ(4), kt, zticoc, jpi*jpj, ndexcs )
618	CALL histsync ( nidcs )
619
620	! 2.2 Last time step (clim or pipe) or pipe mode
621	!
622	IF( kt == nitend .OR. cchan == 'PIPE' ) THEN
623
624	! finalize outputs
625
626	CALL histclo( nidcs )
627
628	! WRITE fields for coupler with pipe technique or for last time step
629
630	! initialisation
631
632	iflmax = 1
633	iunmax = 99
634
635	clfile(iflmax) = cpl_f_writ(iflmax) ! keeps first file name
636	ifile(iflmax) = iunmax ! keeps first file unit
637	iunmax = iunmax - 1 ! decrements file unit maximum
638	ifield(1) = ifile(iflmax) ! keeps file unit for field
639
640	! different files names counter
641	DO jf = 2, nfldo2c
642	llfind = .FALSE.
643	DO jn = 1, iflmax
644	IF( .NOT. llfind ) THEN
645	IF( cpl_f_writ(jf) == clfile(jn) ) THEN
646	ifield(jf) = ifile(jn) ! keep file unit for field
647	llfind = .TRUE.
648	ENDIF
649	END IF
650	END DO
651	IF( .NOT. llfind) THEN
652	iflmax = iflmax + 1 ! increment the number of different files
653	clfile(iflmax) = cpl_f_writ(jf) ! keep file name
654	ifile (iflmax) = iunmax ! keep file unit for file
655	ifield(jf) = ifile(iflmax) ! keep file unit for field
656	iunmax = iunmax-1 ! decrement unit maximum number from 99 to 98...
657	ENDIF
658	END DO
659	!
660	DO jn = 1, iflmax
661	OPEN (ifile(jn), FILE=clfile(jn), FORM='UNFORMATTED')
662	END DO
663	!
664	DO jf = 1, nfldo2c
665	IF( jf == 1 ) CALL locwrite(cpl_writ(jf),zstoc , isize, ifield(jf), ierror, numout)
666	IF( jf == 2 ) CALL locwrite(cpl_writ(jf),zieoc , isize, ifield(jf), ierror, numout)
667	IF( jf == 3 ) CALL locwrite(cpl_writ(jf),zalboc, isize, ifield(jf), ierror, numout)
668	IF( jf == 4 ) CALL locwrite(cpl_writ(jf),zticoc, isize, ifield(jf), ierror, numout)
669	END DO
670
671	! simulate a FLUSH
672
673	DO jn = 1, iflmax
674	CLOSE( ifile(jn) )
675	END DO
676
677	! Clim mode
678	IF( cchan == 'CLIM' ) THEN ! inform PVM daemon, I have finished
679	CALL CLIM_Quit( CLIM_ContPvm, info )
680	IF( info /= CLIM_Ok ) THEN
681	WRITE (6, *) 'An error occured while leaving CLIM. Error = ',info
682	ENDIF
683	ENDIF
684
685	ENDIF
686
687	! IF last we have finished if not pass info to the atmosphere
688
689	IF ( kt /= nitend ) THEN
690
691	! 2.3 normal exchange
692
693	! PIPE mode
694	IF( cchan == 'PIPE' ) THEN
695
696	! Send message to pipes for CPL=atmosphere
697
698	! DO jf = 1, nfldo2c
699	! CALL PIPE_Model_Send(cpl_writ(jf), icstep, numout)
700	! END DO
701
702	! SIPC mode
703	ELSE IF( cchan == 'SIPC' ) THEN
704
705	! Define IF a header must be encapsulated within the field brick :
706	clmodinf = 'NOT' ! as $MODINFO in namcouple
707
708	! IF clmodinf = 'YES', define encapsulated infos to be exchanged
709	! infos(1) = initial date
710	! infos(2) = timestep
711	! infos(3) = actual time
712	!
713	! Writing of output field SST SOSSTSST
714	!
715	! Index of SST in total number of fields jpfldo2a:
716	index = 1
717	!
718	! CALL SIPC_Write_Model(index, isize, clmodinf, cljobnam, infos, zstoc)
719	!
720	! Writing of output field Sea-Ice SOICECOV
721	!
722	! Index of sea-ice in total number of fields jpfldo2a:
723	index = 2
724	!
725	! CALL SIPC_Write_Model(index, isize, clmodinf, cljobnam, infos, zieoc)
726
727	! CLIM mode
728	ELSE IF( cchan == 'CLIM' ) THEN
729
730	DO jn = 1, nfldo2c
731
732	IF (jn == 1) CALL CLIM_Export(cpl_writ(jn), icstep, zstoc , info)
733	IF (jn == 2) CALL CLIM_Export(cpl_writ(jn), icstep, zieoc , info)
734	IF (jn == 3) CALL CLIM_Export(cpl_writ(jn), icstep, zalboc, info)
735	IF (jn == 4) CALL CLIM_Export(cpl_writ(jn), icstep, zticoc, info)
736
737	IF (info /= CLIM_Ok) THEN
738	WRITE (numout,*) 'STEP : Pb giving', cpl_writ(jn), ':', jn
739	WRITE (numout,*) ' at timestep = ', icstep, 'kt = ', kt
740	WRITE (numout,*) 'Clim error code is = ',info
741	WRITE (numout,*) 'STOP in stpcpl '
742	CALL abort(' stpcpl ')
743	ENDIF
744	END DO
745	ENDIF
746
747	! reset cumulative sst and sea-ice extend to zero
748	sstoc(:,:) = 0.e0
749	sieoc(:,:) = 0.e0
750	alboc(:,:) = 0.e0
751	ticoc(:,:) = 0.e0
752	ENDIF
753	ENDIF
754
755	END SUBROUTINE cpl_stp
756
757	#else
758	!!----------------------------------------------------------------------
759	!! Default case Dummy module forced Ocean/Atmosphere
760	!!----------------------------------------------------------------------
761	CONTAINS
762	SUBROUTINE cpl_init ! Dummy routine
763	WRITE(,) 'cpl_init: You should have not see this print! error?'
764	END SUBROUTINE cpl_init
765	SUBROUTINE cpl_stp( kt ) ! Dummy routine
766	WRITE(,) 'cpl_stp: You should have not see this print! error?', kt
767	END SUBROUTINE cpl_stp
768	#endif
769
770	!!======================================================================
771	END MODULE cpl

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