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diaar5.F90 in NEMO/trunk/src/OCE/DIA – NEMO

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source: NEMO/trunk/src/OCE/DIA/diaar5.F90 @ 12489

Last change on this file since 12489 was 12489, checked in by davestorkey, 4 years ago

Preparation for new timestepping scheme #2390.
Main changes:

Initial euler timestep now handled in stp and not in TRA/DYN routines.
Renaming of all timestep parameters. In summary, the namelist parameter is now rn_Dt and the current timestep is rDt (and rDt_ice, rDt_trc etc).
Renaming of a few miscellaneous parameters, eg. atfp -> rn_atfp (namelist parameter used everywhere) and rau0 -> rho0.

This version gives bit-comparable results to the previous version of the trunk.

Property svn:keywords set to Id

File size: 18.6 KB

Rev	Line
[1756]	1	MODULE diaar5
	2	!!======================================================================
	3	!! * MODULE diaar5 *
	4	!! AR5 diagnostics
	5	!!======================================================================
[2528]	6	!! History : 3.2 ! 2009-11 (S. Masson) Original code
	7	!! 3.3 ! 2010-10 (C. Ethe, G. Madec) reorganisation of initialisation phase + merge TRC-TRA
[1756]	8	!!----------------------------------------------------------------------
[2528]	9	!! dia_ar5 : AR5 diagnostics
	10	!! dia_ar5_init : initialisation of AR5 diagnostics
[1756]	11	!!----------------------------------------------------------------------
	12	USE oce ! ocean dynamics and active tracers
	13	USE dom_oce ! ocean space and time domain
[2528]	14	USE eosbn2 ! equation of state (eos_bn2 routine)
[9124]	15	USE phycst ! physical constant
	16	USE in_out_manager ! I/O manager
	17	USE zdfddm
	18	USE zdf_oce
	19	!
[1756]	20	USE lib_mpp ! distribued memory computing library
	21	USE iom ! I/O manager library
[9124]	22	USE fldread ! type FLD_N
[3294]	23	USE timing ! preformance summary
[1756]	24
	25	IMPLICIT NONE
	26	PRIVATE
	27
[2528]	28	PUBLIC dia_ar5 ! routine called in step.F90 module
[2715]	29	PUBLIC dia_ar5_alloc ! routine called in nemogcm.F90 module
[7646]	30	PUBLIC dia_ar5_hst ! heat/salt transport
[1756]	31
[2528]	32	REAL(wp) :: vol0 ! ocean volume (interior domain)
	33	REAL(wp) :: area_tot ! total ocean surface (interior domain)
[2715]	34	REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,: ) :: area ! cell surface (interior domain)
	35	REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,: ) :: thick0 ! ocean thickness (interior domain)
	36	REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: sn0 ! initial salinity
[7646]	37
	38	LOGICAL :: l_ar5
[1756]	39
[7646]	40	!! * Substitutions
[12377]	41	# include "do_loop_substitute.h90"
[1756]	42	!!----------------------------------------------------------------------
[9598]	43	!! NEMO/OCE 4.0 , NEMO Consortium (2018)
[2528]	44	!! $Id$
[10068]	45	!! Software governed by the CeCILL license (see ./LICENSE)
[1756]	46	!!----------------------------------------------------------------------
	47	CONTAINS
	48
[2715]	49	FUNCTION dia_ar5_alloc()
	50	!!----------------------------------------------------------------------
	51	!! * ROUTINE dia_ar5_alloc *
	52	!!----------------------------------------------------------------------
	53	INTEGER :: dia_ar5_alloc
	54	!!----------------------------------------------------------------------
	55	!
	56	ALLOCATE( area(jpi,jpj), thick0(jpi,jpj) , sn0(jpi,jpj,jpk) , STAT=dia_ar5_alloc )
	57	!
[10425]	58	CALL mpp_sum ( 'diaar5', dia_ar5_alloc )
	59	IF( dia_ar5_alloc /= 0 ) CALL ctl_stop( 'STOP', 'dia_ar5_alloc: failed to allocate arrays' )
[2715]	60	!
	61	END FUNCTION dia_ar5_alloc
	62
	63
[12377]	64	SUBROUTINE dia_ar5( kt, Kmm )
[1756]	65	!!----------------------------------------------------------------------
	66	!! * ROUTINE dia_ar5 *
	67	!!
[2528]	68	!! ** Purpose : compute and output some AR5 diagnostics
[1756]	69	!!----------------------------------------------------------------------
[2715]	70	!
[1756]	71	INTEGER, INTENT( in ) :: kt ! ocean time-step index
[12377]	72	INTEGER, INTENT( in ) :: Kmm ! ocean time level index
[2715]	73	!
[12276]	74	INTEGER :: ji, jj, jk, iks, ikb ! dummy loop arguments
	75	REAL(wp) :: zvolssh, zvol, zssh_steric, zztmp, zarho, ztemp, zsal, zmass, zsst
[7646]	76	REAL(wp) :: zaw, zbw, zrw
[3294]	77	!
[9125]	78	REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zarea_ssh , zbotpres ! 2D workspace
[12276]	79	REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zpe, z2d ! 2D workspace
	80	REAL(wp), ALLOCATABLE, DIMENSION(:,:,:) :: zrhd , zrhop, ztpot ! 3D workspace
[9125]	81	REAL(wp), ALLOCATABLE, DIMENSION(:,:,:,:) :: ztsn ! 4D workspace
	82
[1756]	83	!!--------------------------------------------------------------------
[9124]	84	IF( ln_timing ) CALL timing_start('dia_ar5')
[3294]	85
[7646]	86	IF( kt == nit000 ) CALL dia_ar5_init
[1756]	87
[9125]	88	IF( l_ar5 ) THEN
[12276]	89	ALLOCATE( zarea_ssh(jpi,jpj), zbotpres(jpi,jpj), z2d(jpi,jpj) )
[9125]	90	ALLOCATE( zrhd(jpi,jpj,jpk) , zrhop(jpi,jpj,jpk) )
	91	ALLOCATE( ztsn(jpi,jpj,jpk,jpts) )
[12377]	92	zarea_ssh(:,:) = area(:,:) * ssh(:,:,Kmm)
[7646]	93	ENDIF
	94	!
[12276]	95	CALL iom_put( 'e2u' , e2u (:,:) )
	96	CALL iom_put( 'e1v' , e1v (:,:) )
	97	CALL iom_put( 'areacello', area(:,:) )
	98	!
	99	IF( iom_use( 'volcello' ) .OR. iom_use( 'masscello' ) ) THEN
	100	zrhd(:,:,jpk) = 0._wp ! ocean volume ; rhd is used as workspace
	101	DO jk = 1, jpkm1
[12377]	102	zrhd(:,:,jk) = area(:,:) * e3t(:,:,jk,Kmm) * tmask(:,:,jk)
[12276]	103	END DO
	104	CALL iom_put( 'volcello' , zrhd(:,:,:) ) ! WARNING not consistent with CMIP DR where volcello is at ca. 2000
[12489]	105	CALL iom_put( 'masscello' , rho0 * e3t(:,:,:,Kmm) * tmask(:,:,:) ) ! ocean mass
[12276]	106	ENDIF
	107	!
	108	IF( iom_use( 'e3tb' ) ) THEN ! bottom layer thickness
[12377]	109	DO_2D_11_11
	110	ikb = mbkt(ji,jj)
	111	z2d(ji,jj) = e3t(ji,jj,ikb,Kmm)
	112	END_2D
[12276]	113	CALL iom_put( 'e3tb', z2d )
	114	ENDIF
	115	!
[7646]	116	IF( iom_use( 'voltot' ) .OR. iom_use( 'sshtot' ) .OR. iom_use( 'sshdyn' ) ) THEN
	117	! ! total volume of liquid seawater
[12276]	118	zvolssh = glob_sum( 'diaar5', zarea_ssh(:,:) )
	119	zvol = vol0 + zvolssh
[1756]	120
[7646]	121	CALL iom_put( 'voltot', zvol )
	122	CALL iom_put( 'sshtot', zvolssh / area_tot )
[12377]	123	CALL iom_put( 'sshdyn', ssh(:,:,Kmm) - (zvolssh / area_tot) )
[7646]	124	!
	125	ENDIF
[1756]	126
[7646]	127	IF( iom_use( 'botpres' ) .OR. iom_use( 'sshthster' ) .OR. iom_use( 'sshsteric' ) ) THEN
	128	!
[12377]	129	ztsn(:,:,:,jp_tem) = ts(:,:,:,jp_tem,Kmm) ! thermosteric ssh
[7753]	130	ztsn(:,:,:,jp_sal) = sn0(:,:,:)
[12377]	131	CALL eos( ztsn, zrhd, gdept(:,:,:,Kmm) ) ! now in situ density using initial salinity
[7646]	132	!
[7753]	133	zbotpres(:,:) = 0._wp ! no atmospheric surface pressure, levitating sea-ice
[7646]	134	DO jk = 1, jpkm1
[12377]	135	zbotpres(:,:) = zbotpres(:,:) + e3t(:,:,jk,Kmm) * zrhd(:,:,jk)
[7646]	136	END DO
	137	IF( ln_linssh ) THEN
	138	IF( ln_isfcav ) THEN
	139	DO ji = 1, jpi
	140	DO jj = 1, jpj
[12276]	141	iks = mikt(ji,jj)
[12377]	142	zbotpres(ji,jj) = zbotpres(ji,jj) + ssh(ji,jj,Kmm) * zrhd(ji,jj,iks) + riceload(ji,jj)
[7646]	143	END DO
[5120]	144	END DO
[7646]	145	ELSE
[12377]	146	zbotpres(:,:) = zbotpres(:,:) + ssh(:,:,Kmm) * zrhd(:,:,1)
[7646]	147	END IF
[6140]	148	!!gm
	149	!!gm riceload should be added in both ln_linssh=T or F, no?
	150	!!gm
[7646]	151	END IF
	152	!
[12276]	153	zarho = glob_sum( 'diaar5', area(:,:) * zbotpres(:,:) )
[7646]	154	zssh_steric = - zarho / area_tot
	155	CALL iom_put( 'sshthster', zssh_steric )
[1756]	156
[7646]	157	! ! steric sea surface height
[12377]	158	CALL eos( ts(:,:,:,:,Kmm), zrhd, zrhop, gdept(:,:,:,Kmm) ) ! now in situ and potential density
[7753]	159	zrhop(:,:,jpk) = 0._wp
[7646]	160	CALL iom_put( 'rhop', zrhop )
	161	!
[7753]	162	zbotpres(:,:) = 0._wp ! no atmospheric surface pressure, levitating sea-ice
[7646]	163	DO jk = 1, jpkm1
[12377]	164	zbotpres(:,:) = zbotpres(:,:) + e3t(:,:,jk,Kmm) * zrhd(:,:,jk)
[7646]	165	END DO
	166	IF( ln_linssh ) THEN
	167	IF ( ln_isfcav ) THEN
	168	DO ji = 1,jpi
	169	DO jj = 1,jpj
[12276]	170	iks = mikt(ji,jj)
[12377]	171	zbotpres(ji,jj) = zbotpres(ji,jj) + ssh(ji,jj,Kmm) * zrhd(ji,jj,iks) + riceload(ji,jj)
[7646]	172	END DO
[5120]	173	END DO
[7646]	174	ELSE
[12377]	175	zbotpres(:,:) = zbotpres(:,:) + ssh(:,:,Kmm) * zrhd(:,:,1)
[7646]	176	END IF
[5120]	177	END IF
[7646]	178	!
[12276]	179	zarho = glob_sum( 'diaar5', area(:,:) * zbotpres(:,:) )
[7646]	180	zssh_steric = - zarho / area_tot
	181	CALL iom_put( 'sshsteric', zssh_steric )
	182	! ! ocean bottom pressure
[12489]	183	zztmp = rho0 * grav * 1.e-4_wp ! recover pressure from pressure anomaly and cover to dbar = 1.e4 Pa
[12377]	184	zbotpres(:,:) = zztmp * ( zbotpres(:,:) + ssh(:,:,Kmm) + thick0(:,:) )
[7646]	185	CALL iom_put( 'botpres', zbotpres )
	186	!
	187	ENDIF
[1756]	188
[7646]	189	IF( iom_use( 'masstot' ) .OR. iom_use( 'temptot' ) .OR. iom_use( 'saltot' ) ) THEN
[12276]	190	! ! Mean density anomalie, temperature and salinity
	191	ztsn(:,:,:,:) = 0._wp ! ztsn(:,:,1,jp_tem/sal) is used here as 2D Workspace for temperature & salinity
[12377]	192	DO_3D_11_11( 1, jpkm1 )
	193	zztmp = area(ji,jj) * e3t(ji,jj,jk,Kmm)
	194	ztsn(ji,jj,1,jp_tem) = ztsn(ji,jj,1,jp_tem) + zztmp * ts(ji,jj,jk,jp_tem,Kmm)
	195	ztsn(ji,jj,1,jp_sal) = ztsn(ji,jj,1,jp_sal) + zztmp * ts(ji,jj,jk,jp_sal,Kmm)
	196	END_3D
[12276]	197
	198	IF( ln_linssh ) THEN
[7646]	199	IF( ln_isfcav ) THEN
	200	DO ji = 1, jpi
	201	DO jj = 1, jpj
[12276]	202	iks = mikt(ji,jj)
[12377]	203	ztsn(ji,jj,1,jp_tem) = ztsn(ji,jj,1,jp_tem) + zarea_ssh(ji,jj) * ts(ji,jj,iks,jp_tem,Kmm)
	204	ztsn(ji,jj,1,jp_sal) = ztsn(ji,jj,1,jp_sal) + zarea_ssh(ji,jj) * ts(ji,jj,iks,jp_sal,Kmm)
[7646]	205	END DO
[5120]	206	END DO
[7646]	207	ELSE
[12377]	208	ztsn(:,:,1,jp_tem) = ztsn(:,:,1,jp_tem) + zarea_ssh(:,:) * ts(:,:,1,jp_tem,Kmm)
	209	ztsn(:,:,1,jp_sal) = ztsn(:,:,1,jp_sal) + zarea_ssh(:,:) * ts(:,:,1,jp_sal,Kmm)
[7646]	210	END IF
	211	ENDIF
	212	!
[12276]	213	ztemp = glob_sum( 'diaar5', ztsn(:,:,1,jp_tem) )
	214	zsal = glob_sum( 'diaar5', ztsn(:,:,1,jp_sal) )
[12489]	215	zmass = rho0 * ( zarho + zvol )
[7646]	216	!
	217	CALL iom_put( 'masstot', zmass )
[12276]	218	CALL iom_put( 'temptot', ztemp / zvol )
	219	CALL iom_put( 'saltot' , zsal / zvol )
[7646]	220	!
[12276]	221	ENDIF
	222
	223	IF( ln_teos10 ) THEN ! ! potential temperature (TEOS-10 case)
	224	IF( iom_use( 'toce_pot') .OR. iom_use( 'temptot_pot' ) .OR. iom_use( 'sst_pot' ) &
	225	.OR. iom_use( 'ssttot' ) .OR. iom_use( 'tosmint_pot' ) ) THEN
	226	!
	227	ALLOCATE( ztpot(jpi,jpj,jpk) )
	228	ztpot(:,:,jpk) = 0._wp
	229	DO jk = 1, jpkm1
[12377]	230	ztpot(:,:,jk) = eos_pt_from_ct( ts(:,:,jk,jp_tem,Kmm), ts(:,:,jk,jp_sal,Kmm) )
[12276]	231	END DO
	232	!
	233	CALL iom_put( 'toce_pot', ztpot(:,:,:) ) ! potential temperature (TEOS-10 case)
	234	CALL iom_put( 'sst_pot' , ztpot(:,:,1) ) ! surface temperature
	235	!
	236	IF( iom_use( 'temptot_pot' ) ) THEN ! Output potential temperature in case we use TEOS-10
	237	z2d(:,:) = 0._wp
	238	DO jk = 1, jpkm1
[12377]	239	z2d(:,:) = z2d(:,:) + area(:,:) * e3t(:,:,jk,Kmm) * ztpot(:,:,jk)
[12276]	240	END DO
	241	ztemp = glob_sum( 'diaar5', z2d(:,:) )
	242	CALL iom_put( 'temptot_pot', ztemp / zvol )
	243	ENDIF
	244	!
	245	IF( iom_use( 'ssttot' ) ) THEN ! Output potential temperature in case we use TEOS-10
	246	zsst = glob_sum( 'diaar5', area(:,:) * ztpot(:,:,1) )
	247	CALL iom_put( 'ssttot', zsst / area_tot )
	248	ENDIF
	249	! Vertical integral of temperature
	250	IF( iom_use( 'tosmint_pot') ) THEN
	251	z2d(:,:) = 0._wp
[12377]	252	DO_3D_11_11( 1, jpkm1 )
[12489]	253	z2d(ji,jj) = z2d(ji,jj) + rho0 * e3t(ji,jj,jk,Kmm) * ztpot(ji,jj,jk)
[12377]	254	END_3D
[12276]	255	CALL iom_put( 'tosmint_pot', z2d )
	256	ENDIF
	257	DEALLOCATE( ztpot )
	258	ENDIF
	259	ELSE
	260	IF( iom_use('ssttot') ) THEN ! Output sst in case we use EOS-80
[12377]	261	zsst = glob_sum( 'diaar5', area(:,:) * ts(:,:,1,jp_tem,Kmm) )
[12276]	262	CALL iom_put('ssttot', zsst / area_tot )
	263	ENDIF
[1756]	264	ENDIF
[7646]	265
	266	IF( iom_use( 'tnpeo' )) THEN
[12276]	267	! Work done against stratification by vertical mixing
	268	! Exclude points where rn2 is negative as convection kicks in here and
	269	! work is not being done against stratification
[9125]	270	ALLOCATE( zpe(jpi,jpj) )
[8078]	271	zpe(:,:) = 0._wp
[9019]	272	IF( ln_zdfddm ) THEN
[12377]	273	DO_3D_11_11( 2, jpk )
	274	IF( rn2(ji,jj,jk) > 0._wp ) THEN
	275	zrw = ( gdept(ji,jj,jk,Kmm) - gdepw(ji,jj,jk,Kmm) ) / e3w(ji,jj,jk,Kmm)
	276	!
	277	zaw = rab_n(ji,jj,jk,jp_tem) * (1. - zrw) + rab_n(ji,jj,jk-1,jp_tem)* zrw
	278	zbw = rab_n(ji,jj,jk,jp_sal) * (1. - zrw) + rab_n(ji,jj,jk-1,jp_sal)* zrw
	279	!
	280	zpe(ji, jj) = zpe(ji,jj) &
	281	& - grav * ( avt(ji,jj,jk) * zaw * (ts(ji,jj,jk-1,jp_tem,Kmm) - ts(ji,jj,jk,jp_tem,Kmm) ) &
	282	& - avs(ji,jj,jk) * zbw * (ts(ji,jj,jk-1,jp_sal,Kmm) - ts(ji,jj,jk,jp_sal,Kmm) ) )
	283	ENDIF
	284	END_3D
[7646]	285	ELSE
[12377]	286	DO_3D_11_11( 1, jpk )
[12489]	287	zpe(ji,jj) = zpe(ji,jj) + avt(ji,jj,jk) * MIN(0._wp,rn2(ji,jj,jk)) * rho0 * e3w(ji,jj,jk,Kmm)
[12377]	288	END_3D
[8078]	289	ENDIF
[9019]	290	CALL iom_put( 'tnpeo', zpe )
[9125]	291	DEALLOCATE( zpe )
[7646]	292	ENDIF
[9125]	293
[7646]	294	IF( l_ar5 ) THEN
[12276]	295	DEALLOCATE( zarea_ssh , zbotpres, z2d )
[9125]	296	DEALLOCATE( zrhd , zrhop )
	297	DEALLOCATE( ztsn )
[7646]	298	ENDIF
[1756]	299	!
[9124]	300	IF( ln_timing ) CALL timing_stop('dia_ar5')
[3294]	301	!
[1756]	302	END SUBROUTINE dia_ar5
	303
[9124]	304
[12377]	305	SUBROUTINE dia_ar5_hst( ktra, cptr, puflx, pvflx )
[7646]	306	!!----------------------------------------------------------------------
	307	!! * ROUTINE dia_ar5_htr *
	308	!!----------------------------------------------------------------------
	309	!! Wrapper for heat transport calculations
	310	!! Called from all advection and/or diffusion routines
	311	!!----------------------------------------------------------------------
	312	INTEGER , INTENT(in ) :: ktra ! tracer index
	313	CHARACTER(len=3) , INTENT(in) :: cptr ! transport type 'adv'/'ldf'
[12377]	314	REAL(wp), DIMENSION(jpi,jpj,jpk), INTENT(in) :: puflx ! u-flux of advection/diffusion
	315	REAL(wp), DIMENSION(jpi,jpj,jpk), INTENT(in) :: pvflx ! v-flux of advection/diffusion
[7646]	316	!
	317	INTEGER :: ji, jj, jk
[9125]	318	REAL(wp), DIMENSION(jpi,jpj) :: z2d
[1756]	319
[7646]	320
[12377]	321	z2d(:,:) = puflx(:,:,1)
	322	DO_3D_00_00( 1, jpkm1 )
	323	z2d(ji,jj) = z2d(ji,jj) + puflx(ji,jj,jk)
	324	END_3D
[10425]	325	CALL lbc_lnk( 'diaar5', z2d, 'U', -1. )
[7646]	326	IF( cptr == 'adv' ) THEN
[12489]	327	IF( ktra == jp_tem ) CALL iom_put( 'uadv_heattr' , rho0_rcp * z2d ) ! advective heat transport in i-direction
	328	IF( ktra == jp_sal ) CALL iom_put( 'uadv_salttr' , rho0 * z2d ) ! advective salt transport in i-direction
[7646]	329	ENDIF
	330	IF( cptr == 'ldf' ) THEN
[12489]	331	IF( ktra == jp_tem ) CALL iom_put( 'udiff_heattr' , rho0_rcp * z2d ) ! diffusive heat transport in i-direction
	332	IF( ktra == jp_sal ) CALL iom_put( 'udiff_salttr' , rho0 * z2d ) ! diffusive salt transport in i-direction
[7646]	333	ENDIF
	334	!
[12377]	335	z2d(:,:) = pvflx(:,:,1)
	336	DO_3D_00_00( 1, jpkm1 )
	337	z2d(ji,jj) = z2d(ji,jj) + pvflx(ji,jj,jk)
	338	END_3D
[10425]	339	CALL lbc_lnk( 'diaar5', z2d, 'V', -1. )
[7646]	340	IF( cptr == 'adv' ) THEN
[12489]	341	IF( ktra == jp_tem ) CALL iom_put( 'vadv_heattr' , rho0_rcp * z2d ) ! advective heat transport in j-direction
	342	IF( ktra == jp_sal ) CALL iom_put( 'vadv_salttr' , rho0 * z2d ) ! advective salt transport in j-direction
[7646]	343	ENDIF
	344	IF( cptr == 'ldf' ) THEN
[12489]	345	IF( ktra == jp_tem ) CALL iom_put( 'vdiff_heattr' , rho0_rcp * z2d ) ! diffusive heat transport in j-direction
	346	IF( ktra == jp_sal ) CALL iom_put( 'vdiff_salttr' , rho0 * z2d ) ! diffusive salt transport in j-direction
[7646]	347	ENDIF
	348
	349	END SUBROUTINE dia_ar5_hst
	350
	351
[1756]	352	SUBROUTINE dia_ar5_init
	353	!!----------------------------------------------------------------------
	354	!! * ROUTINE dia_ar5_init *
	355	!!
[2528]	356	!! ** Purpose : initialization for AR5 diagnostic computation
[1756]	357	!!----------------------------------------------------------------------
	358	INTEGER :: inum
[12276]	359	INTEGER :: ik, idep
[1756]	360	INTEGER :: ji, jj, jk ! dummy loop indices
[7753]	361	REAL(wp) :: zztmp
[9125]	362	REAL(wp), ALLOCATABLE, DIMENSION(:,:,:,:) :: zsaldta ! Jan/Dec levitus salinity
[12276]	363	REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zvol0
[5253]	364	!
[1756]	365	!!----------------------------------------------------------------------
	366	!
[7646]	367	l_ar5 = .FALSE.
	368	IF( iom_use( 'voltot' ) .OR. iom_use( 'sshtot' ) .OR. iom_use( 'sshdyn' ) .OR. &
	369	& iom_use( 'masstot' ) .OR. iom_use( 'temptot' ) .OR. iom_use( 'saltot' ) .OR. &
	370	& iom_use( 'botpres' ) .OR. iom_use( 'sshthster' ) .OR. iom_use( 'sshsteric' ) ) L_ar5 = .TRUE.
	371
	372	IF( l_ar5 ) THEN
	373	!
	374	! ! allocate dia_ar5 arrays
	375	IF( dia_ar5_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'dia_ar5_init : unable to allocate arrays' )
[2715]	376
[12276]	377	area(:,:) = e1e2t(:,:)
	378	area_tot = glob_sum( 'diaar5', area(:,:) )
[1756]	379
[12276]	380	ALLOCATE( zvol0(jpi,jpj) )
	381	zvol0 (:,:) = 0._wp
[7753]	382	thick0(:,:) = 0._wp
[12377]	383	DO_3D_11_11( 1, jpkm1 )
	384	idep = tmask(ji,jj,jk) * e3t_0(ji,jj,jk)
	385	zvol0 (ji,jj) = zvol0 (ji,jj) + idep * area(ji,jj)
	386	thick0(ji,jj) = thick0(ji,jj) + idep
	387	END_3D
[12276]	388	vol0 = glob_sum( 'diaar5', zvol0 )
	389	DEALLOCATE( zvol0 )
[5253]	390
[9125]	391	IF( iom_use( 'sshthster' ) ) THEN
[12276]	392	ALLOCATE( zsaldta(jpi,jpj,jpk,jpts) )
[9125]	393	CALL iom_open ( 'sali_ref_clim_monthly', inum )
	394	CALL iom_get ( inum, jpdom_data, 'vosaline' , zsaldta(:,:,:,1), 1 )
	395	CALL iom_get ( inum, jpdom_data, 'vosaline' , zsaldta(:,:,:,2), 12 )
	396	CALL iom_close( inum )
[6665]	397
[9125]	398	sn0(:,:,:) = 0.5_wp * ( zsaldta(:,:,:,1) + zsaldta(:,:,:,2) )
	399	sn0(:,:,:) = sn0(:,:,:) * tmask(:,:,:)
	400	IF( ln_zps ) THEN ! z-coord. partial steps
[12377]	401	DO_2D_11_11
	402	ik = mbkt(ji,jj)
	403	IF( ik > 1 ) THEN
	404	zztmp = ( gdept_1d(ik) - gdept_0(ji,jj,ik) ) / ( gdept_1d(ik) - gdept_1d(ik-1) )
	405	sn0(ji,jj,ik) = ( 1._wp - zztmp ) * sn0(ji,jj,ik) + zztmp * sn0(ji,jj,ik-1)
	406	ENDIF
	407	END_2D
[9125]	408	ENDIF
	409	!
	410	DEALLOCATE( zsaldta )
[7646]	411	ENDIF
	412	!
[1756]	413	ENDIF
	414	!
	415	END SUBROUTINE dia_ar5_init
	416
	417	!!======================================================================
	418	END MODULE diaar5

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