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nemogcm.F90 in branches/UKMO/dev_r5518_GO6_package_text_diagnostics/NEMOGCM/NEMO/OPA_SRC – NEMO

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source: branches/UKMO/dev_r5518_GO6_package_text_diagnostics/NEMOGCM/NEMO/OPA_SRC/nemogcm.F90 @ 10759

Last change on this file since 10759 was 10759, checked in by andmirek, 5 years ago
GMED 450 write output.namelist.dyn only for nprint > 2
File size: 44.1 KB

Rev	Line
[2496]	1	MODULE nemogcm
[2442]	2	!!======================================================================
[2496]	3	!! * MODULE nemogcm *
	4	!! Ocean system : NEMO GCM (ocean dynamics, on-line tracers, biochemistry and sea-ice)
[2442]	5	!!======================================================================
[1593]	6	!! History : OPA ! 1990-10 (C. Levy, G. Madec) Original code
	7	!! 7.0 ! 1991-11 (M. Imbard, C. Levy, G. Madec)
[3764]	8	!! 7.1 ! 1993-03 (M. Imbard, C. Levy, G. Madec, O. Marti, M. Guyon, A. Lazar,
	9	!! P. Delecluse, C. Perigaud, G. Caniaux, B. Colot, C. Maes) release 7.1
[1593]	10	!! - ! 1992-06 (L.Terray) coupling implementation
[3764]	11	!! - ! 1993-11 (M.A. Filiberti) IGLOO sea-ice
	12	!! 8.0 ! 1996-03 (M. Imbard, C. Levy, G. Madec, O. Marti, M. Guyon, A. Lazar,
[2104]	13	!! P. Delecluse, L.Terray, M.A. Filiberti, J. Vialar, A.M. Treguier, M. Levy) release 8.0
[1593]	14	!! 8.1 ! 1997-06 (M. Imbard, G. Madec)
[3764]	15	!! 8.2 ! 1999-11 (M. Imbard, H. Goosse) LIM sea-ice model
	16	!! ! 1999-12 (V. Thierry, A-M. Treguier, M. Imbard, M-A. Foujols) OPEN-MP
[1593]	17	!! ! 2000-07 (J-M Molines, M. Imbard) Open Boundary Conditions (CLIPPER)
	18	!! NEMO 1.0 ! 2002-08 (G. Madec) F90: Free form and modules
	19	!! - ! 2004-06 (R. Redler, NEC CCRLE, Germany) add OASIS[3/4] coupled interfaces
	20	!! - ! 2004-08 (C. Talandier) New trends organization
	21	!! - ! 2005-06 (C. Ethe) Add the 1D configuration possibility
	22	!! - ! 2005-11 (V. Garnier) Surface pressure gradient organization
	23	!! - ! 2006-03 (L. Debreu, C. Mazauric) Agrif implementation
	24	!! - ! 2006-04 (G. Madec, R. Benshila) Step reorganization
	25	!! - ! 2007-07 (J. Chanut, A. Sellar) Unstructured open boundaries (BDY)
	26	!! 3.2 ! 2009-08 (S. Masson) open/write in the listing file in mpp
[3764]	27	!! 3.3 ! 2010-05 (K. Mogensen, A. Weaver, M. Martin, D. Lea) Assimilation interface
[2236]	28	!! - ! 2010-10 (C. Ethe, G. Madec) reorganisation of initialisation phase
[3294]	29	!! 3.3.1! 2011-01 (A. R. Porter, STFC Daresbury) dynamical allocation
	30	!! 3.4 ! 2011-11 (C. Harris) decomposition changes for running with CICE
[4152]	31	!! ! 2012-05 (C. Calone, J. Simeon, G. Madec, C. Ethe) Add grid coarsening
[1593]	32	!!----------------------------------------------------------------------
[3]	33
	34	!!----------------------------------------------------------------------
[2496]	35	!! nemo_gcm : solve ocean dynamics, tracer, biogeochemistry and/or sea-ice
	36	!! nemo_init : initialization of the NEMO system
[3764]	37	!! nemo_ctl : initialisation of the contol print
[2496]	38	!! nemo_closefile : close remaining open files
[2715]	39	!! nemo_alloc : dynamical allocation
	40	!! nemo_partition : calculate MPP domain decomposition
	41	!! factorise : calculate the factors of the no. of MPI processes
[3]	42	!!----------------------------------------------------------------------
[2382]	43	USE step_oce ! module used in the ocean time stepping module
[2392]	44	USE cla ! cross land advection (tra_cla routine)
[3]	45	USE domcfg ! domain configuration (dom_cfg routine)
	46	USE mppini ! shared/distributed memory setting (mpp_init routine)
	47	USE domain ! domain initialization (dom_init routine)
[3625]	48	#if defined key_nemocice_decomp
	49	USE ice_domain_size, only: nx_global, ny_global
	50	#endif
[3651]	51	USE tideini ! tidal components initialization (tide_ini routine)
[4990]	52	USE bdyini ! open boundary cond. setting (bdy_init routine)
	53	USE bdydta ! open boundary cond. setting (bdy_dta_init routine)
	54	USE bdytides ! open boundary cond. setting (bdytide_init routine)
[3]	55	USE istate ! initial state setting (istate_init routine)
	56	USE ldfdyn ! lateral viscosity setting (ldfdyn_init routine)
	57	USE ldftra ! lateral diffusivity setting (ldftra_init routine)
[2392]	58	USE zdfini ! vertical physics setting (zdf_init routine)
[3]	59	USE phycst ! physical constant (par_cst routine)
[4990]	60	USE trdini ! dyn/tra trends initialization (trd_init routine)
[3768]	61	USE asminc ! assimilation increments
	62	USE asmbkg ! writing out state trajectory
[10149]	63	USE asmbgc ! biogeochemical assimilation increments
[2236]	64	USE diaptr ! poleward transports (dia_ptr_init routine)
[3294]	65	USE diadct ! sections transports (dia_dct_init routine)
[2236]	66	USE diaobs ! Observation diagnostics (dia_obs_init routine)
[3764]	67	USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined)
[2496]	68	USE step ! NEMO time-stepping (stp routine)
[3609]	69	USE icbini ! handle bergs, initialisation
	70	USE icbstp ! handle bergs, calving, themodynamics and transport
[8280]	71	USE sbccpl
[1359]	72	USE cpl_oasis3 ! OASIS3 coupling
[900]	73	USE c1d ! 1D configuration
	74	USE step_c1d ! Time stepping loop for the 1D configuration
[4245]	75	USE dyndmp ! Momentum damping
[1594]	76	#if defined key_top
[1593]	77	USE trcini ! passive tracer initialisation
[8280]	78	USE trc, ONLY: numstr ! tracer stats unit number
[1594]	79	#endif
[1593]	80	USE lib_mpp ! distributed memory computing
[1412]	81	#if defined key_iomput
[3701]	82	USE xios
[1359]	83	#endif
[3651]	84	USE sbctide, ONLY: lk_tide
[4152]	85	USE crsini ! initialise grid coarsening utility
[4671]	86	USE lbcnfd, ONLY: isendto, nsndto, nfsloop, nfeloop ! Setup of north fold exchanges
[5407]	87	USE sbc_oce, ONLY: lk_oasis
[5329]	88	USE stopar
	89	USE stopts
[268]	90
[2715]	91	IMPLICIT NONE
[3]	92	PRIVATE
	93
[2496]	94	PUBLIC nemo_gcm ! called by model.F90
	95	PUBLIC nemo_init ! needed by AGRIF
[3764]	96	PUBLIC nemo_alloc ! needed by TAM
[467]	97
[2498]	98	CHARACTER(lc) :: cform_aaa="( /, 'AAAAAAAA', / ) " ! flag for output listing
[1593]	99
[3]	100	!!----------------------------------------------------------------------
[2715]	101	!! NEMO/OPA 4.0 , NEMO Consortium (2011)
[2392]	102	!! $Id$
[2329]	103	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[3]	104	!!----------------------------------------------------------------------
	105	CONTAINS
	106
[2496]	107	SUBROUTINE nemo_gcm
[3]	108	!!----------------------------------------------------------------------
[2496]	109	!! * ROUTINE nemo_gcm *
[3]	110	!!
[3764]	111	!! ** Purpose : NEMO solves the primitive equations on an orthogonal
[1593]	112	!! curvilinear mesh on the sphere.
[3]	113	!!
	114	!! ** Method : - model general initialization
	115	!! - launch the time-stepping (stp routine)
[1593]	116	!! - finalize the run by closing files and communications
[3]	117	!!
[2715]	118	!! References : Madec, Delecluse, Imbard, and Levy, 1997: internal report, IPSL.
[1593]	119	!! Madec, 2008, internal report, IPSL.
[3]	120	!!----------------------------------------------------------------------
	121	INTEGER :: istp ! time step index
[389]	122	!!----------------------------------------------------------------------
[2382]	123	!
[392]	124	#if defined key_agrif
[1593]	125	CALL Agrif_Init_Grids() ! AGRIF: set the meshes
[389]	126	#endif
	127
[1593]	128	! !-----------------------!
[2496]	129	CALL nemo_init !== Initialisations ==!
[1593]	130	! !-----------------------!
[2715]	131	#if defined key_agrif
[3680]	132	CALL Agrif_Declare_Var_dom ! AGRIF: set the meshes for DOM
	133	CALL Agrif_Declare_Var ! " " " " " DYN/TRA
[2715]	134	# if defined key_top
[3680]	135	CALL Agrif_Declare_Var_top ! " " " " " TOP
[2715]	136	# endif
[3680]	137	# if defined key_lim2
	138	CALL Agrif_Declare_Var_lim2 ! " " " " " LIM
	139	# endif
[2715]	140	#endif
[682]	141	! check that all process are still there... If some process have an error,
	142	! they will never enter in step and other processes will wait until the end of the cpu time!
[900]	143	IF( lk_mpp ) CALL mpp_max( nstop )
[682]	144
[1593]	145	IF(lwp) WRITE(numout,cform_aaa) ! Flag AAAAAAA
	146
	147	! !-----------------------!
	148	! !== time stepping ==!
	149	! !-----------------------!
[900]	150	istp = nit000
[2236]	151	#if defined key_c1d
[389]	152	DO WHILE ( istp <= nitend .AND. nstop == 0 )
[900]	153	CALL stp_c1d( istp )
[389]	154	istp = istp + 1
	155	END DO
[2236]	156	#else
	157	IF( lk_asminc ) THEN
	158	IF( ln_bkgwri ) CALL asm_bkg_wri( nit000 - 1 ) ! Output background fields
	159	IF( ln_asmdin ) THEN ! Direct initialization
	160	IF( ln_trainc ) CALL tra_asm_inc( nit000 - 1 ) ! Tracers
[3764]	161	IF( ln_dyninc ) CALL dyn_asm_inc( nit000 - 1 ) ! Dynamics
[2236]	162	IF( ln_sshinc ) CALL ssh_asm_inc( nit000 - 1 ) ! SSH
[10149]	163	IF( lk_bgcinc ) CALL bgc_asm_inc( nit000 - 1 ) ! BGC
[2236]	164	ENDIF
	165	ENDIF
[3764]	166
[6487]	167	#if defined key_agrif
	168	CALL Agrif_Regrid()
	169	#endif
	170
[389]	171	DO WHILE ( istp <= nitend .AND. nstop == 0 )
[392]	172	#if defined key_agrif
[6487]	173	CALL stp ! AGRIF: time stepping
[389]	174	#else
[8280]	175	IF (lk_oasis) CALL sbc_cpl_snd( istp ) ! Coupling to atmos
	176	CALL stp( istp )
	177	! We don't couple on the final timestep because
	178	! our restart file has already been written
	179	! and contains all the necessary data for a
	180	! restart. sbc_cpl_snd could be called here
	181	! but it would require
	182	! a) A test to ensure it was not performed
	183	! on the very last time-step
	184	! b) the presence of another call to
	185	! sbc_cpl_snd call prior to the main DO loop
	186	! This solution produces identical results
	187	! with fewer lines of code.
[389]	188	#endif
	189	istp = istp + 1
[900]	190	IF( lk_mpp ) CALL mpp_max( nstop )
[389]	191	END DO
[2236]	192	#endif
	193
[3609]	194	IF( lk_diaobs ) CALL dia_obs_wri
	195	!
[10149]	196	IF( ( lk_asminc ).AND.( ln_balwri ) ) CALL asm_bgc_bal_wri( nitend ) ! Output balancing increments
	197	!
[3609]	198	IF( ln_icebergs ) CALL icb_end( nitend )
[3764]	199
[1593]	200	! !------------------------!
	201	! !== finalize the run ==!
	202	! !------------------------!
	203	IF(lwp) WRITE(numout,cform_aaa) ! Flag AAAAAAA
	204	!
	205	IF( nstop /= 0 .AND. lwp ) THEN ! error print
[682]	206	WRITE(numout,cform_err)
[3764]	207	WRITE(numout,*) nstop, ' error have been found'
[389]	208	ENDIF
[1593]	209	!
[3294]	210	#if defined key_agrif
[6487]	211	IF( .NOT. Agrif_Root() ) THEN
	212	CALL Agrif_ParentGrid_To_ChildGrid()
	213	IF( lk_diaobs ) CALL dia_obs_wri
[9321]	214	IF( nn_timing > 0 ) CALL timing_finalize
[6487]	215	CALL Agrif_ChildGrid_To_ParentGrid()
	216	ENDIF
[3294]	217	#endif
[9321]	218	IF( nn_timing > 0 ) CALL timing_finalize
[3294]	219	!
[2496]	220	CALL nemo_closefile
[4990]	221	!
[3769]	222	#if defined key_iomput
	223	CALL xios_finalize ! end mpp communications with xios
[5407]	224	IF( lk_oasis ) CALL cpl_finalize ! end coupling and mpp communications with OASIS
[532]	225	#else
[5407]	226	IF( lk_oasis ) THEN
[4990]	227	CALL cpl_finalize ! end coupling and mpp communications with OASIS
	228	ELSE
	229	IF( lk_mpp ) CALL mppstop ! end mpp communications
	230	ENDIF
[532]	231	#endif
[900]	232	!
[8400]	233	! Met Office addition: if failed, return non-zero exit code
	234	IF( nstop /= 0 ) CALL exit( 9 )
	235	!
[2496]	236	END SUBROUTINE nemo_gcm
[389]	237
	238
[2496]	239	SUBROUTINE nemo_init
[389]	240	!!----------------------------------------------------------------------
[2496]	241	!! * ROUTINE nemo_init *
[389]	242	!!
[2496]	243	!! ** Purpose : initialization of the NEMO GCM
[389]	244	!!----------------------------------------------------------------------
[2715]	245	INTEGER :: ji ! dummy loop indices
	246	INTEGER :: ilocal_comm ! local integer
[4147]	247	INTEGER :: ios
[2715]	248	CHARACTER(len=80), DIMENSION(16) :: cltxt
[4990]	249	!
[10745]	250	NAMELIST/namctl/ ln_ctl ,sn_cfctl, nn_print, nn_ictls, nn_ictle, &
[3294]	251	& nn_isplt, nn_jsplt, nn_jctls, nn_jctle, &
	252	& nn_bench, nn_timing
[4147]	253	NAMELIST/namcfg/ cp_cfg, cp_cfz, jp_cfg, jpidta, jpjdta, jpkdta, jpiglo, jpjglo, &
[5118]	254	& jpizoom, jpjzoom, jperio, ln_use_jattr
[3]	255	!!----------------------------------------------------------------------
[1593]	256	!
[2496]	257	cltxt = ''
[5407]	258	cxios_context = 'nemo'
[2496]	259	!
[4147]	260	! ! Open reference namelist and configuration namelist files
	261	CALL ctl_opn( numnam_ref, 'namelist_ref', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE. )
	262	CALL ctl_opn( numnam_cfg, 'namelist_cfg', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE. )
[1593]	263	!
[4147]	264	REWIND( numnam_ref ) ! Namelist namctl in reference namelist : Control prints & Benchmark
	265	READ ( numnam_ref, namctl, IOSTAT = ios, ERR = 901 )
[4289]	266	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namctl in reference namelist', .TRUE. )
[4147]	267
	268	REWIND( numnam_cfg ) ! Namelist namctl in confguration namelist : Control prints & Benchmark
	269	READ ( numnam_cfg, namctl, IOSTAT = ios, ERR = 902 )
[4289]	270	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namctl in configuration namelist', .TRUE. )
[4147]	271
[1593]	272	!
[4147]	273	REWIND( numnam_ref ) ! Namelist namcfg in reference namelist : Control prints & Benchmark
	274	READ ( numnam_ref, namcfg, IOSTAT = ios, ERR = 903 )
[4289]	275	903 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namcfg in reference namelist', .TRUE. )
[4147]	276
	277	REWIND( numnam_cfg ) ! Namelist namcfg in confguration namelist : Control prints & Benchmark
	278	READ ( numnam_cfg, namcfg, IOSTAT = ios, ERR = 904 )
[4289]	279	904 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namcfg in configuration namelist', .TRUE. )
[4309]	280
[4147]	281	! Force values for AGRIF zoom (cf. agrif_user.F90)
	282	#if defined key_agrif
	283	IF( .NOT. Agrif_Root() ) THEN
	284	jpiglo = nbcellsx + 2 + 2*nbghostcells
	285	jpjglo = nbcellsy + 2 + 2*nbghostcells
	286	jpi = ( jpiglo-2jpreci + (jpni-1+0) ) / jpni + 2jpreci
	287	jpj = ( jpjglo-2jprecj + (jpnj-1+0) ) / jpnj + 2jprecj
	288	jpidta = jpiglo
	289	jpjdta = jpjglo
	290	jpizoom = 1
	291	jpjzoom = 1
	292	nperio = 0
	293	jperio = 0
[5118]	294	ln_use_jattr = .false.
[4147]	295	ENDIF
	296	#endif
[10759]	297	nprint = nn_print ! convert DOCTOR namelist names into OLD names
	298	!do it here because output.namelist.dyn is opened before nprint was set earlier
[4147]	299	!
[1593]	300	! !--------------------------------------------!
	301	! ! set communicator & select the local node !
[4624]	302	! ! NB: mynode also opens output.namelist.dyn !
	303	! ! on unit number numond on first proc !
[1593]	304	! !--------------------------------------------!
[1412]	305	#if defined key_iomput
[2200]	306	IF( Agrif_Root() ) THEN
[5407]	307	IF( lk_oasis ) THEN
[8280]	308	CALL cpl_init( "toyoce", ilocal_comm ) ! nemo local communicator given by oasis
[5407]	309	CALL xios_initialize( "not used",local_comm=ilocal_comm ) ! send nemo communicator to xios
[4990]	310	ELSE
[5407]	311	CALL xios_initialize( "for_xios_mpi_id",return_comm=ilocal_comm ) ! nemo local communicator given by xios
[4990]	312	ENDIF
[2200]	313	ENDIF
[5407]	314	! Nodes selection (control print return in cltxt)
	315	narea = mynode( cltxt, 'output.namelist.dyn', numnam_ref, numnam_cfg, numond , nstop, ilocal_comm )
[532]	316	#else
[5407]	317	IF( lk_oasis ) THEN
[4990]	318	IF( Agrif_Root() ) THEN
[8280]	319	CALL cpl_init( "toyoce", ilocal_comm ) ! nemo local communicator given by oasis
[4990]	320	ENDIF
[5407]	321	! Nodes selection (control print return in cltxt)
	322	narea = mynode( cltxt, 'output.namelist.dyn', numnam_ref, numnam_cfg, numond , nstop, ilocal_comm )
[4990]	323	ELSE
	324	ilocal_comm = 0
[5407]	325	! Nodes selection (control print return in cltxt)
	326	narea = mynode( cltxt, 'output.namelist.dyn', numnam_ref, numnam_cfg, numond , nstop )
[2236]	327	ENDIF
[532]	328	#endif
[2715]	329	narea = narea + 1 ! mynode return the rank of proc (0 --> jpnij -1 )
[3]	330
[10745]	331	IF( sn_cfctl%l_config ) THEN
	332	! Activate finer control of report outputs
	333	! optionally switch off output from selected areas (note this only
	334	! applies to output which does not involve global communications)
	335	IF( ( narea < sn_cfctl%procmin .OR. narea > sn_cfctl%procmax ) .OR. &
	336	& ( MOD( narea - sn_cfctl%procmin, sn_cfctl%procincr ) /= 0 ) ) &
	337	& CALL nemo_set_cfctl( sn_cfctl, .FALSE., .FALSE. )
	338	ELSE
	339	! Use ln_ctl to turn on or off all options.
	340	CALL nemo_set_cfctl( sn_cfctl, ln_ctl, .TRUE. )
	341	ENDIF
	342
[4624]	343	lwm = (narea == 1) ! control of output namelists
[2715]	344	lwp = (narea == 1) .OR. ln_ctl ! control of all listing output print
[1579]	345
[10759]	346	IF(lwm .AND. nprint > 2) THEN
[4624]	347	! write merged namelists from earlier to output namelist now that the
	348	! file has been opened in call to mynode. nammpp has already been
	349	! written in mynode (if lk_mpp_mpi)
	350	WRITE( numond, namctl )
	351	WRITE( numond, namcfg )
	352	ENDIF
	353
[3764]	354	! If dimensions of processor grid weren't specified in the namelist file
[2715]	355	! then we calculate them here now that we have our communicator size
	356	IF( (jpni < 1) .OR. (jpnj < 1) )THEN
	357	#if defined key_mpp_mpi
	358	IF( Agrif_Root() ) CALL nemo_partition(mppsize)
	359	#else
	360	jpni = 1
	361	jpnj = 1
	362	jpnij = jpni*jpnj
	363	#endif
	364	END IF
	365
	366	! Calculate domain dimensions given calculated jpni and jpnj
	367	! This used to be done in par_oce.F90 when they were parameters rather
	368	! than variables
	369	IF( Agrif_Root() ) THEN
[3294]	370	#if defined key_nemocice_decomp
[3625]	371	jpi = ( nx_global+2-2jpreci + (jpni-1) ) / jpni + 2jpreci ! first dim.
	372	jpj = ( ny_global+2-2jprecj + (jpnj-1) ) / jpnj + 2jprecj ! second dim.
[3294]	373	#else
[3625]	374	jpi = ( jpiglo-2jpreci + (jpni-1) ) / jpni + 2jpreci ! first dim.
[2715]	375	jpj = ( jpjglo-2jprecj + (jpnj-1) ) / jpnj + 2jprecj ! second dim.
[3294]	376	#endif
[6487]	377	ENDIF
[2715]	378	jpk = jpkdta ! third dim
[6487]	379	#if defined key_agrif
	380	! simple trick to use same vertical grid as parent
	381	! but different number of levels:
	382	! Save maximum number of levels in jpkdta, then define all vertical grids
	383	! with this number.
	384	! Suppress once vertical online interpolation is ok
	385	IF(.NOT.Agrif_Root()) jpkdta = Agrif_Parent(jpkdta)
	386	#endif
[2715]	387	jpim1 = jpi-1 ! inner domain indices
	388	jpjm1 = jpj-1 ! " "
	389	jpkm1 = jpk-1 ! " "
	390	jpij = jpi*jpj ! jpi x j
	391
[1593]	392	IF(lwp) THEN ! open listing units
	393	!
[1581]	394	CALL ctl_opn( numout, 'ocean.output', 'REPLACE', 'FORMATTED', 'SEQUENTIAL', -1, 6, .FALSE., narea )
[1593]	395	!
[1579]	396	WRITE(numout,*)
[3294]	397	WRITE(numout,*) ' CNRS - NERC - Met OFFICE - MERCATOR-ocean - INGV - CMCC'
[1593]	398	WRITE(numout,*) ' NEMO team'
[1579]	399	WRITE(numout,*) ' Ocean General Circulation Model'
[5120]	400	WRITE(numout,*) ' version 3.6 (2015) '
[1579]	401	WRITE(numout,*)
	402	WRITE(numout,*)
[3764]	403	DO ji = 1, SIZE(cltxt)
[1593]	404	IF( TRIM(cltxt(ji)) /= '' ) WRITE(numout,*) cltxt(ji) ! control print of mynode
[1579]	405	END DO
[1593]	406	WRITE(numout,cform_aaa) ! Flag AAAAAAA
	407	!
[473]	408	ENDIF
[2715]	409
[3764]	410	! Now we know the dimensions of the grid and numout has been set we can
[2715]	411	! allocate arrays
	412	CALL nemo_alloc()
	413
[2496]	414	! !-------------------------------!
	415	! ! NEMO general initialization !
	416	! !-------------------------------!
[473]	417
[2496]	418	CALL nemo_ctl ! Control prints & Benchmark
[531]	419
[2082]	420	! ! Domain decomposition
[1593]	421	IF( jpni*jpnj == jpnij ) THEN ; CALL mpp_init ! standard cutting out
	422	ELSE ; CALL mpp_init2 ! eliminate land processors
[3]	423	ENDIF
[2382]	424	!
[9321]	425	IF( nn_timing > 0 ) CALL timing_init
[3294]	426	!
[2082]	427	! ! General initialization
[2027]	428	CALL phy_cst ! Physical constants
	429	CALL eos_init ! Equation of state
[4245]	430	IF( lk_c1d ) CALL c1d_init ! 1D column configuration
[2027]	431	CALL dom_cfg ! Domain configuration
	432	CALL dom_init ! Domain
[413]	433
[3294]	434	IF( ln_nnogather ) CALL nemo_northcomms ! Initialise the northfold neighbour lists (must be done after the masks are defined)
	435
[2027]	436	IF( ln_ctl ) CALL prt_ctl_init ! Print control
	437
[3651]	438	CALL istate_init ! ocean initial state (Dynamics and tracers)
	439
[4292]	440	IF( lk_tide ) CALL tide_init( nit000 ) ! Initialisation of the tidal harmonics
[3651]	441
[5123]	442	CALL sbc_init ! Forcings : surface module (clem: moved here for bdy purpose)
	443
[4990]	444	IF( lk_bdy ) CALL bdy_init ! Open boundaries initialisation
	445	IF( lk_bdy ) CALL bdy_dta_init ! Open boundaries initialisation of external data arrays
[4292]	446	IF( lk_bdy .AND. lk_tide ) &
[4990]	447	& CALL bdytide_init ! Open boundaries initialisation of tidal harmonic forcing
[2027]	448
[3294]	449	CALL dyn_nept_init ! simplified form of Neptune effect
[4152]	450	!
	451	IF( ln_crs ) CALL crs_init ! Domain initialization of coarsened grid
	452	!
	453	! Ocean physics
[2082]	454	! ! Vertical physics
	455	CALL zdf_init ! namelist read
	456	CALL zdf_bfr_init ! bottom friction
	457	IF( lk_zdfric ) CALL zdf_ric_init ! Richardson number dependent Kz
[2329]	458	IF( lk_zdftke ) CALL zdf_tke_init ! TKE closure scheme
	459	IF( lk_zdfgls ) CALL zdf_gls_init ! GLS closure scheme
	460	IF( lk_zdfkpp ) CALL zdf_kpp_init ! KPP closure scheme
[2082]	461	IF( lk_zdftmx ) CALL zdf_tmx_init ! tidal vertical mixing
[3764]	462	IF( lk_zdfddm .AND. .NOT. lk_zdfkpp ) &
[2082]	463	& CALL zdf_ddm_init ! double diffusive mixing
	464	! ! Lateral physics
	465	CALL ldf_tra_init ! Lateral ocean tracer physics
	466	CALL ldf_dyn_init ! Lateral ocean momentum physics
[2392]	467	IF( lk_ldfslp ) CALL ldf_slp_init ! slope of lateral mixing
[2082]	468
[2027]	469	! ! Active tracers
	470	CALL tra_qsr_init ! penetrative solar radiation qsr
[2325]	471	CALL tra_bbc_init ! bottom heat flux
[2027]	472	IF( lk_trabbl ) CALL tra_bbl_init ! advective (and/or diffusive) bottom boundary layer scheme
[4245]	473	CALL tra_dmp_init ! internal damping trends- tracers
[2027]	474	CALL tra_adv_init ! horizontal & vertical advection
	475	CALL tra_ldf_init ! lateral mixing
	476	CALL tra_zdf_init ! vertical mixing and after tracer fields
	477
	478	! ! Dynamics
[4245]	479	IF( lk_c1d ) CALL dyn_dmp_init ! internal damping trends- momentum
[2027]	480	CALL dyn_adv_init ! advection (vector or flux form)
[2104]	481	CALL dyn_vor_init ! vorticity term including Coriolis
[2027]	482	CALL dyn_ldf_init ! lateral mixing
[2104]	483	CALL dyn_hpg_init ! horizontal gradient of Hydrostatic pressure
[2027]	484	CALL dyn_zdf_init ! vertical diffusion
	485	CALL dyn_spg_init ! surface pressure gradient
[3764]	486
[2392]	487	! ! Misc. options
[4147]	488	IF( nn_cla == 1 .AND. cp_cfg == 'orca' .AND. jp_cfg == 2 ) CALL cla_init ! Cross Land Advection
[3609]	489	CALL icb_init( rdt, nit000) ! initialise icebergs instance
[5329]	490	CALL sto_par_init ! Stochastic parametrization
	491	IF( ln_sto_eos ) CALL sto_pts_init ! RRandom T/S fluctuations
[4147]	492
[1594]	493	#if defined key_top
[2027]	494	! ! Passive tracers
[2082]	495	CALL trc_init
[1594]	496	#endif
[4990]	497	! ! Diagnostics
[3294]	498	IF( lk_floats ) CALL flo_init ! drifting Floats
[2027]	499	CALL dia_ptr_init ! Poleward TRansports initialization
[3294]	500	IF( lk_diadct ) CALL dia_dct_init ! Sections tranports
[2148]	501	CALL dia_hsb_init ! heat content, salt content and volume budgets
[4990]	502	CALL trd_init ! Mixed-layer/Vorticity/Integral constraints trends
[8400]	503	CALL bias_init ! Pressure correction bias
[2392]	504	IF( lk_diaobs ) THEN ! Observation & model comparison
[2382]	505	CALL dia_obs_init ! Initialize observational data
	506	CALL dia_obs( nit000 - 1 ) ! Observation operator for restart
[3764]	507	ENDIF
[4990]	508
[2382]	509	! ! Assimilation increments
[2392]	510	IF( lk_asminc ) CALL asm_inc_init ! Initialize assimilation increments
[2382]	511	IF(lwp) WRITE(numout,*) 'Euler time step switch is ', neuler
[8280]	512
	513	IF (nstop > 0) THEN
	514	CALL CTL_STOP('STOP','Critical errors in NEMO initialisation')
	515	END IF
	516
[1593]	517	!
[2496]	518	END SUBROUTINE nemo_init
[467]	519
	520
[2496]	521	SUBROUTINE nemo_ctl
[467]	522	!!----------------------------------------------------------------------
[2496]	523	!! * ROUTINE nemo_ctl *
[467]	524	!!
[3764]	525	!! ** Purpose : control print setting
[467]	526	!!
[2442]	527	!! ** Method : - print namctl information and check some consistencies
[467]	528	!!----------------------------------------------------------------------
[2442]	529	!
[2496]	530	IF(lwp) THEN ! control print
[531]	531	WRITE(numout,*)
[2496]	532	WRITE(numout,*) 'nemo_ctl: Control prints & Benchmark'
[531]	533	WRITE(numout,*) '~~~~~~~ '
[1593]	534	WRITE(numout,*) ' Namelist namctl'
[1601]	535	WRITE(numout,*) ' run control (for debugging) ln_ctl = ', ln_ctl
[10745]	536	WRITE(numout,*) ' finer control over o/p sn_cfctl%l_config = ', sn_cfctl%l_config
	537	WRITE(numout,*) ' sn_cfctl%l_runstat = ', sn_cfctl%l_runstat
	538	WRITE(numout,*) ' sn_cfctl%l_trcstat = ', sn_cfctl%l_trcstat
	539	WRITE(numout,*) ' sn_cfctl%l_oceout = ', sn_cfctl%l_oceout
	540	WRITE(numout,*) ' sn_cfctl%l_layout = ', sn_cfctl%l_layout
	541	WRITE(numout,*) ' sn_cfctl%l_mppout = ', sn_cfctl%l_mppout
	542	WRITE(numout,*) ' sn_cfctl%l_mpptop = ', sn_cfctl%l_mpptop
	543	WRITE(numout,*) ' sn_cfctl%procmin = ', sn_cfctl%procmin
	544	WRITE(numout,*) ' sn_cfctl%procmax = ', sn_cfctl%procmax
	545	WRITE(numout,*) ' sn_cfctl%procincr = ', sn_cfctl%procincr
	546	WRITE(numout,*) ' sn_cfctl%ptimincr = ', sn_cfctl%ptimincr
[1601]	547	WRITE(numout,*) ' level of print nn_print = ', nn_print
	548	WRITE(numout,*) ' Start i indice for SUM control nn_ictls = ', nn_ictls
	549	WRITE(numout,*) ' End i indice for SUM control nn_ictle = ', nn_ictle
	550	WRITE(numout,*) ' Start j indice for SUM control nn_jctls = ', nn_jctls
	551	WRITE(numout,*) ' End j indice for SUM control nn_jctle = ', nn_jctle
	552	WRITE(numout,*) ' number of proc. following i nn_isplt = ', nn_isplt
	553	WRITE(numout,*) ' number of proc. following j nn_jsplt = ', nn_jsplt
	554	WRITE(numout,*) ' benchmark parameter (0/1) nn_bench = ', nn_bench
[3610]	555	WRITE(numout,*) ' timing activated (0/1) nn_timing = ', nn_timing
[531]	556	ENDIF
[2442]	557	!
[1601]	558	nictls = nn_ictls
	559	nictle = nn_ictle
	560	njctls = nn_jctls
	561	njctle = nn_jctle
	562	isplt = nn_isplt
	563	jsplt = nn_jsplt
	564	nbench = nn_bench
[4147]	565
	566	IF(lwp) THEN ! control print
	567	WRITE(numout,*)
	568	WRITE(numout,*) 'namcfg : configuration initialization through namelist read'
	569	WRITE(numout,*) '~~~~~~~ '
	570	WRITE(numout,*) ' Namelist namcfg'
	571	WRITE(numout,*) ' configuration name cp_cfg = ', TRIM(cp_cfg)
	572	WRITE(numout,*) ' configuration zoom name cp_cfz = ', TRIM(cp_cfz)
	573	WRITE(numout,*) ' configuration resolution jp_cfg = ', jp_cfg
	574	WRITE(numout,*) ' 1st lateral dimension ( >= jpi ) jpidta = ', jpidta
	575	WRITE(numout,*) ' 2nd " " ( >= jpj ) jpjdta = ', jpjdta
	576	WRITE(numout,*) ' 3nd " " jpkdta = ', jpkdta
	577	WRITE(numout,*) ' 1st dimension of global domain in i jpiglo = ', jpiglo
	578	WRITE(numout,*) ' 2nd - - in j jpjglo = ', jpjglo
	579	WRITE(numout,*) ' left bottom i index of the zoom (in data domain) jpizoom = ', jpizoom
	580	WRITE(numout,*) ' left bottom j index of the zoom (in data domain) jpizoom = ', jpjzoom
	581	WRITE(numout,*) ' lateral cond. type (between 0 and 6) jperio = ', jperio
[5118]	582	WRITE(numout,*) ' use file attribute if exists as i/p j-start ln_use_jattr = ', ln_use_jattr
[4147]	583	ENDIF
[2442]	584	! ! Parameter control
[1593]	585	!
	586	IF( ln_ctl ) THEN ! sub-domain area indices for the control prints
[3294]	587	IF( lk_mpp .AND. jpnij > 1 ) THEN
[2496]	588	isplt = jpni ; jsplt = jpnj ; ijsplt = jpni*jpnj ! the domain is forced to the real split domain
[531]	589	ELSE
	590	IF( isplt == 1 .AND. jsplt == 1 ) THEN
[1593]	591	CALL ctl_warn( ' - isplt & jsplt are equal to 1', &
	592	& ' - the print control will be done over the whole domain' )
[531]	593	ENDIF
[1593]	594	ijsplt = isplt * jsplt ! total number of processors ijsplt
[531]	595	ENDIF
	596	IF(lwp) WRITE(numout,*)' - The total number of processors over which the'
	597	IF(lwp) WRITE(numout,*)' print control will be done is ijsplt : ', ijsplt
[1593]	598	!
	599	! ! indices used for the SUM control
	600	IF( nictls+nictle+njctls+njctle == 0 ) THEN ! print control done over the default area
[3764]	601	lsp_area = .FALSE.
[1593]	602	ELSE ! print control done over a specific area
[531]	603	lsp_area = .TRUE.
	604	IF( nictls < 1 .OR. nictls > jpiglo ) THEN
	605	CALL ctl_warn( ' - nictls must be 1<=nictls>=jpiglo, it is forced to 1' )
	606	nictls = 1
	607	ENDIF
	608	IF( nictle < 1 .OR. nictle > jpiglo ) THEN
	609	CALL ctl_warn( ' - nictle must be 1<=nictle>=jpiglo, it is forced to jpiglo' )
	610	nictle = jpiglo
	611	ENDIF
	612	IF( njctls < 1 .OR. njctls > jpjglo ) THEN
	613	CALL ctl_warn( ' - njctls must be 1<=njctls>=jpjglo, it is forced to 1' )
	614	njctls = 1
	615	ENDIF
	616	IF( njctle < 1 .OR. njctle > jpjglo ) THEN
	617	CALL ctl_warn( ' - njctle must be 1<=njctle>=jpjglo, it is forced to jpjglo' )
	618	njctle = jpjglo
	619	ENDIF
[1593]	620	ENDIF
	621	ENDIF
[2442]	622	!
[3764]	623	IF( nbench == 1 ) THEN ! Benchmark
[531]	624	SELECT CASE ( cp_cfg )
[1593]	625	CASE ( 'gyre' ) ; CALL ctl_warn( ' The Benchmark is activated ' )
	626	CASE DEFAULT ; CALL ctl_stop( ' The Benchmark is based on the GYRE configuration:', &
[4147]	627	& ' cp_cfg = "gyre" in namelist &namcfg or set nbench = 0' )
[531]	628	END SELECT
	629	ENDIF
[1593]	630	!
[3764]	631	IF( 1_wp /= SIGN(1._wp,-0._wp) ) CALL ctl_stop( 'nemo_ctl: The intrinsec SIGN function follows ', &
	632	& 'f2003 standard. ' , &
	633	& 'Compile with key_nosignedzero enabled' )
	634	!
[2496]	635	END SUBROUTINE nemo_ctl
[467]	636
	637
[2496]	638	SUBROUTINE nemo_closefile
[467]	639	!!----------------------------------------------------------------------
[2496]	640	!! * ROUTINE nemo_closefile *
[467]	641	!!
	642	!! ** Purpose : Close the files
	643	!!----------------------------------------------------------------------
[1593]	644	!
	645	IF( lk_mpp ) CALL mppsync
	646	!
[1685]	647	CALL iom_close ! close all input/output files managed by iom_*
[1593]	648	!
[4147]	649	IF( numstp /= -1 ) CLOSE( numstp ) ! time-step file
	650	IF( numsol /= -1 ) CLOSE( numsol ) ! solver file
	651	IF( numnam_ref /= -1 ) CLOSE( numnam_ref ) ! oce reference namelist
	652	IF( numnam_cfg /= -1 ) CLOSE( numnam_cfg ) ! oce configuration namelist
[4624]	653	IF( lwm.AND.numond /= -1 ) CLOSE( numond ) ! oce output namelist
[4147]	654	IF( numnam_ice_ref /= -1 ) CLOSE( numnam_ice_ref ) ! ice reference namelist
	655	IF( numnam_ice_cfg /= -1 ) CLOSE( numnam_ice_cfg ) ! ice configuration namelist
[4624]	656	IF( lwm.AND.numoni /= -1 ) CLOSE( numoni ) ! ice output namelist
[4147]	657	IF( numevo_ice /= -1 ) CLOSE( numevo_ice ) ! ice variables (temp. evolution)
	658	IF( numout /= 6 ) CLOSE( numout ) ! standard model output file
	659	IF( numdct_vol /= -1 ) CLOSE( numdct_vol ) ! volume transports
	660	IF( numdct_heat /= -1 ) CLOSE( numdct_heat ) ! heat transports
	661	IF( numdct_salt /= -1 ) CLOSE( numdct_salt ) ! salt transports
[8280]	662	#if defined key_top
	663	IF( numstr /= -1 ) CLOSE( numstr ) ! tracer statistics
	664	#endif
[1593]	665	!
[2442]	666	numout = 6 ! redefine numout in case it is used after this point...
	667	!
[2496]	668	END SUBROUTINE nemo_closefile
[467]	669
[2715]	670
	671	SUBROUTINE nemo_alloc
	672	!!----------------------------------------------------------------------
	673	!! * ROUTINE nemo_alloc *
	674	!!
	675	!! ** Purpose : Allocate all the dynamic arrays of the OPA modules
	676	!!
	677	!! ** Method :
	678	!!----------------------------------------------------------------------
	679	USE diawri , ONLY: dia_wri_alloc
[8400]	680	USE insitu_tem, ONLY: insitu_tem_alloc
[2715]	681	USE dom_oce , ONLY: dom_oce_alloc
	682	USE ldfdyn_oce, ONLY: ldfdyn_oce_alloc
	683	USE ldftra_oce, ONLY: ldftra_oce_alloc
	684	USE trc_oce , ONLY: trc_oce_alloc
[3680]	685	#if defined key_diadct
	686	USE diadct , ONLY: diadct_alloc
	687	#endif
[4354]	688	#if defined key_bdy
	689	USE bdy_oce , ONLY: bdy_oce_alloc
	690	#endif
[2715]	691	!
	692	INTEGER :: ierr
	693	!!----------------------------------------------------------------------
	694	!
[3764]	695	ierr = oce_alloc () ! ocean
[2715]	696	ierr = ierr + dia_wri_alloc ()
[8400]	697	ierr = ierr + insitu_tem_alloc()
[2715]	698	ierr = ierr + dom_oce_alloc () ! ocean domain
	699	ierr = ierr + ldfdyn_oce_alloc() ! ocean lateral physics : dynamics
	700	ierr = ierr + ldftra_oce_alloc() ! ocean lateral physics : tracers
	701	ierr = ierr + zdf_oce_alloc () ! ocean vertical physics
	702	!
	703	ierr = ierr + trc_oce_alloc () ! shared TRC / TRA arrays
	704	!
[3680]	705	#if defined key_diadct
	706	ierr = ierr + diadct_alloc () !
	707	#endif
[4354]	708	#if defined key_bdy
	709	ierr = ierr + bdy_oce_alloc () ! bdy masks (incl. initialization)
	710	#endif
[3680]	711	!
[2715]	712	IF( lk_mpp ) CALL mpp_sum( ierr )
	713	IF( ierr /= 0 ) CALL ctl_stop( 'STOP', 'nemo_alloc : unable to allocate standard ocean arrays' )
	714	!
	715	END SUBROUTINE nemo_alloc
	716
[10745]	717	SUBROUTINE nemo_set_cfctl(sn_cfctl, setto, for_all )
	718	!!----------------------------------------------------------------------
	719	!! * ROUTINE nemo_set_cfctl *
	720	!!
	721	!! ** Purpose : Set elements of the output control structure to setto.
	722	!! for_all should be .false. unless all areas are to be
	723	!! treated identically.
	724	!!
	725	!! ** Method : Note this routine can be used to switch on/off some
	726	!! types of output for selected areas but any output types
	727	!! that involve global communications (e.g. mpp_max, glob_sum)
	728	!! should be protected from selective switching by the
	729	!! for_all argument
	730	!!----------------------------------------------------------------------
	731	LOGICAL :: setto, for_all
	732	TYPE(sn_ctl) :: sn_cfctl
	733	!!----------------------------------------------------------------------
	734	IF( for_all ) THEN
	735	sn_cfctl%l_runstat = setto
	736	sn_cfctl%l_trcstat = setto
	737	ENDIF
	738	sn_cfctl%l_oceout = setto
	739	sn_cfctl%l_layout = setto
	740	sn_cfctl%l_mppout = setto
	741	sn_cfctl%l_mpptop = setto
	742	END SUBROUTINE nemo_set_cfctl
[2715]	743
	744	SUBROUTINE nemo_partition( num_pes )
	745	!!----------------------------------------------------------------------
	746	!! * ROUTINE nemo_partition *
	747	!!
[3764]	748	!! ** Purpose :
[2715]	749	!!
	750	!! ** Method :
	751	!!----------------------------------------------------------------------
[4990]	752	INTEGER, INTENT(in) :: num_pes ! The number of MPI processes we have
[2715]	753	!
	754	INTEGER, PARAMETER :: nfactmax = 20
	755	INTEGER :: nfact ! The no. of factors returned
	756	INTEGER :: ierr ! Error flag
	757	INTEGER :: ji
	758	INTEGER :: idiff, mindiff, imin ! For choosing pair of factors that are closest in value
	759	INTEGER, DIMENSION(nfactmax) :: ifact ! Array of factors
	760	!!----------------------------------------------------------------------
[4990]	761	!
[2715]	762	ierr = 0
[4990]	763	!
[2715]	764	CALL factorise( ifact, nfactmax, nfact, num_pes, ierr )
[4990]	765	!
[2715]	766	IF( nfact <= 1 ) THEN
	767	WRITE (numout, *) 'WARNING: factorisation of number of PEs failed'
	768	WRITE (numout, *) ' : using grid of ',num_pes,' x 1'
	769	jpnj = 1
	770	jpni = num_pes
	771	ELSE
	772	! Search through factors for the pair that are closest in value
	773	mindiff = 1000000
	774	imin = 1
	775	DO ji = 1, nfact-1, 2
	776	idiff = ABS( ifact(ji) - ifact(ji+1) )
	777	IF( idiff < mindiff ) THEN
	778	mindiff = idiff
	779	imin = ji
	780	ENDIF
	781	END DO
	782	jpnj = ifact(imin)
	783	jpni = ifact(imin + 1)
	784	ENDIF
	785	!
	786	jpnij = jpni*jpnj
	787	!
	788	END SUBROUTINE nemo_partition
	789
	790
	791	SUBROUTINE factorise( kfax, kmaxfax, knfax, kn, kerr )
	792	!!----------------------------------------------------------------------
	793	!! * ROUTINE factorise *
	794	!!
	795	!! ** Purpose : return the prime factors of n.
[3764]	796	!! knfax factors are returned in array kfax which is of
[2715]	797	!! maximum dimension kmaxfax.
	798	!! ** Method :
	799	!!----------------------------------------------------------------------
	800	INTEGER , INTENT(in ) :: kn, kmaxfax
	801	INTEGER , INTENT( out) :: kerr, knfax
	802	INTEGER, DIMENSION(kmaxfax), INTENT( out) :: kfax
	803	!
	804	INTEGER :: ifac, jl, inu
	805	INTEGER, PARAMETER :: ntest = 14
[6487]	806	INTEGER, DIMENSION(ntest) :: ilfax
[4990]	807	!
[6487]	808	! ilfax contains the set of allowed factors.
	809	ilfax(:) = (/(2**jl,jl=ntest,1,-1)/)
[2715]	810	!!----------------------------------------------------------------------
[6487]	811	! ilfax contains the set of allowed factors.
	812	ilfax(:) = (/(2**jl,jl=ntest,1,-1)/)
[2715]	813
	814	! Clear the error flag and initialise output vars
	815	kerr = 0
	816	kfax = 1
	817	knfax = 0
	818
	819	! Find the factors of n.
	820	IF( kn == 1 ) GOTO 20
	821
	822	! nu holds the unfactorised part of the number.
	823	! knfax holds the number of factors found.
	824	! l points to the allowed factor list.
	825	! ifac holds the current factor.
	826
	827	inu = kn
	828	knfax = 0
	829
	830	DO jl = ntest, 1, -1
	831	!
	832	ifac = ilfax(jl)
	833	IF( ifac > inu ) CYCLE
	834
	835	! Test whether the factor will divide.
	836
	837	IF( MOD(inu,ifac) == 0 ) THEN
	838	!
	839	knfax = knfax + 1 ! Add the factor to the list
	840	IF( knfax > kmaxfax ) THEN
	841	kerr = 6
	842	write (,) 'FACTOR: insufficient space in factor array ', knfax
	843	return
	844	ENDIF
	845	kfax(knfax) = ifac
	846	! Store the other factor that goes with this one
	847	knfax = knfax + 1
	848	kfax(knfax) = inu / ifac
	849	!WRITE (,) 'ARPDBG, factors ',knfax-1,' & ',knfax,' are ', kfax(knfax-1),' and ',kfax(knfax)
	850	ENDIF
	851	!
	852	END DO
	853
	854	20 CONTINUE ! Label 20 is the exit point from the factor search loop.
	855	!
	856	END SUBROUTINE factorise
	857
[3294]	858	#if defined key_mpp_mpi
[4990]	859
[3294]	860	SUBROUTINE nemo_northcomms
	861	!!======================================================================
	862	!! * ROUTINE nemo_northcomms *
[4230]	863	!! nemo_northcomms : Setup for north fold exchanges with explicit
	864	!! point-to-point messaging
[3294]	865	!!=====================================================================
	866	!!----------------------------------------------------------------------
[3764]	867	!!
[3294]	868	!! ** Purpose : Initialization of the northern neighbours lists.
	869	!!----------------------------------------------------------------------
[3764]	870	!! 1.0 ! 2011-10 (A. C. Coward, NOCS & J. Donners, PRACE)
[4230]	871	!! 2.0 ! 2013-06 Setup avoiding MPI communication (I. Epicoco, S. Mocavero, CMCC)
[3294]	872	!!----------------------------------------------------------------------
	873
[4230]	874	INTEGER :: sxM, dxM, sxT, dxT, jn
	875	INTEGER :: njmppmax
[3294]	876
[4230]	877	njmppmax = MAXVAL( njmppt )
	878
	879	!initializes the north-fold communication variables
	880	isendto(:) = 0
[3294]	881	nsndto = 0
	882
[4230]	883	!if I am a process in the north
	884	IF ( njmpp == njmppmax ) THEN
	885	!sxM is the first point (in the global domain) needed to compute the
	886	!north-fold for the current process
	887	sxM = jpiglo - nimppt(narea) - nlcit(narea) + 1
	888	!dxM is the last point (in the global domain) needed to compute the
	889	!north-fold for the current process
	890	dxM = jpiglo - nimppt(narea) + 2
[3294]	891
[4230]	892	!loop over the other north-fold processes to find the processes
	893	!managing the points belonging to the sxT-dxT range
[4671]	894
	895	DO jn = 1, jpni
[4230]	896	!sxT is the first point (in the global domain) of the jn
	897	!process
[4671]	898	sxT = nfiimpp(jn, jpnj)
[4230]	899	!dxT is the last point (in the global domain) of the jn
	900	!process
[4671]	901	dxT = nfiimpp(jn, jpnj) + nfilcit(jn, jpnj) - 1
[4230]	902	IF ((sxM .gt. sxT) .AND. (sxM .lt. dxT)) THEN
	903	nsndto = nsndto + 1
[4671]	904	isendto(nsndto) = jn
[4645]	905	ELSEIF ((sxM .le. sxT) .AND. (dxM .ge. dxT)) THEN
[4230]	906	nsndto = nsndto + 1
[4671]	907	isendto(nsndto) = jn
[4230]	908	ELSEIF ((dxM .lt. dxT) .AND. (sxT .lt. dxM)) THEN
	909	nsndto = nsndto + 1
[4671]	910	isendto(nsndto) = jn
[4230]	911	END IF
	912	END DO
[4671]	913	nfsloop = 1
	914	nfeloop = nlci
	915	DO jn = 2,jpni-1
	916	IF(nfipproc(jn,jpnj) .eq. (narea - 1)) THEN
	917	IF (nfipproc(jn - 1 ,jpnj) .eq. -1) THEN
	918	nfsloop = nldi
	919	ENDIF
	920	IF (nfipproc(jn + 1,jpnj) .eq. -1) THEN
	921	nfeloop = nlei
	922	ENDIF
	923	ENDIF
	924	END DO
	925
[3294]	926	ENDIF
[4230]	927	l_north_nogather = .TRUE.
[3294]	928	END SUBROUTINE nemo_northcomms
	929	#else
	930	SUBROUTINE nemo_northcomms ! Dummy routine
	931	WRITE(,) 'nemo_northcomms: You should not have seen this print! error?'
	932	END SUBROUTINE nemo_northcomms
	933	#endif
[4990]	934
[3]	935	!!======================================================================
[2496]	936	END MODULE nemogcm
[4354]	937
	938

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