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istate.F90 in branches/2015/dev_r5094_UKMO_ISFCLEAN/NEMOGCM/NEMO/OPA_SRC/DOM – NEMO

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source: branches/2015/dev_r5094_UKMO_ISFCLEAN/NEMOGCM/NEMO/OPA_SRC/DOM/istate.F90 @ 5111

Last change on this file since 5111 was 5111, checked in by mathiot, 9 years ago
add some missing if ln_isfcav, test of option compatibility with ln_isfcav + small documentation
Property svn:keywords set to `Id`
File size: 27.5 KB

Rev	Line
[3]	1	MODULE istate
	2	!!======================================================================
	3	!! * MODULE istate *
	4	!! Ocean state : initial state setting
	5	!!=====================================================================
[2104]	6	!! History : OPA ! 1989-12 (P. Andrich) Original code
	7	!! 5.0 ! 1991-11 (G. Madec) rewritting
	8	!! 6.0 ! 1996-01 (G. Madec) terrain following coordinates
	9	!! 8.0 ! 2001-09 (M. Levy, M. Ben Jelloul) istate_eel
	10	!! 8.0 ! 2001-09 (M. Levy, M. Ben Jelloul) istate_uvg
	11	!! NEMO 1.0 ! 2003-08 (G. Madec, C. Talandier) F90: Free form, modules + EEL R5
	12	!! - ! 2004-05 (A. Koch-Larrouy) istate_gyre
	13	!! 2.0 ! 2006-07 (S. Masson) distributed restart using iom
	14	!! 3.3 ! 2010-10 (C. Ethe) merge TRC-TRA
[3294]	15	!! 3.4 ! 2011-04 (G. Madec) Merge of dtatem and dtasal & suppression of tb,tn/sb,sn
[508]	16	!!----------------------------------------------------------------------
[3]	17
	18	!!----------------------------------------------------------------------
	19	!! istate_init : initial state setting
	20	!! istate_tem : analytical profile for initial Temperature
	21	!! istate_sal : analytical profile for initial Salinity
	22	!! istate_eel : initial state setting of EEL R5 configuration
[93]	23	!! istate_gyre : initial state setting of GYRE configuration
[3]	24	!! istate_uvg : initial velocity in geostropic balance
	25	!!----------------------------------------------------------------------
	26	USE oce ! ocean dynamics and active tracers
	27	USE dom_oce ! ocean space and time domain
[4245]	28	USE c1d ! 1D vertical configuration
[2104]	29	USE daymod ! calendar
	30	USE eosbn2 ! eq. of state, Brunt Vaisala frequency (eos routine)
[3]	31	USE ldftra_oce ! ocean active tracers: lateral physics
	32	USE zdf_oce ! ocean vertical physics
	33	USE phycst ! physical constants
[3294]	34	USE dtatsd ! data temperature and salinity (dta_tsd routine)
[4245]	35	USE dtauvd ! data: U & V current (dta_uvd routine)
[544]	36	USE zpshde ! partial step: hor. derivative (zps_hde routine)
	37	USE eosbn2 ! equation of state (eos bn2 routine)
[593]	38	USE domvvl ! varying vertical mesh
	39	USE dynspg_oce ! pressure gradient schemes
[4370]	40	USE dynspg_flt ! filtered free surface
[3764]	41	USE sol_oce ! ocean solver variables
[4990]	42	!
	43	USE in_out_manager ! I/O manager
	44	USE iom ! I/O library
[2715]	45	USE lib_mpp ! MPP library
[3680]	46	USE restart ! restart
[3294]	47	USE wrk_nemo ! Memory allocation
	48	USE timing ! Timing
[2715]	49
[3]	50	IMPLICIT NONE
	51	PRIVATE
	52
[508]	53	PUBLIC istate_init ! routine called by step.F90
[3]	54
	55	!! * Substitutions
	56	# include "domzgr_substitute.h90"
	57	# include "vectopt_loop_substitute.h90"
	58	!!----------------------------------------------------------------------
[4990]	59	!! NEMO/OPA 3.7 , NEMO Consortium (2014)
[888]	60	!! $Id$
[2715]	61	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[3]	62	!!----------------------------------------------------------------------
	63	CONTAINS
	64
	65	SUBROUTINE istate_init
	66	!!----------------------------------------------------------------------
	67	!! * ROUTINE istate_init *
	68	!!
[508]	69	!! ** Purpose : Initialization of the dynamics and tracer fields.
[3]	70	!!----------------------------------------------------------------------
[2148]	71	! - ML - needed for initialization of e3t_b
[4354]	72	INTEGER :: ji,jj,jk ! dummy loop indices
[4245]	73	REAL(wp), POINTER, DIMENSION(:,:,:,:) :: zuvd ! U & V data workspace
[3294]	74	!!----------------------------------------------------------------------
	75	!
[4990]	76	IF( nn_timing == 1 ) CALL timing_start('istate_init')
[3294]	77	!
[3]	78
[4990]	79	IF(lwp) WRITE(numout,*) ' '
[508]	80	IF(lwp) WRITE(numout,*) 'istate_ini : Initialization of the dynamics and tracers'
	81	IF(lwp) WRITE(numout,*) '~~~~~~~~~~'
[3]	82
[3294]	83	CALL dta_tsd_init ! Initialisation of T & S input data
[4245]	84	IF( lk_c1d ) CALL dta_uvd_init ! Initialization of U & V input data
[3]	85
[4990]	86	rhd (:,:,: ) = 0._wp
	87	rhop (:,:,: ) = 0._wp
	88	rn2 (:,:,: ) = 0._wp
	89	tsa (:,:,:,:) = 0._wp
	90	rab_b(:,:,:,:) = 0._wp
	91	rab_n(:,:,:,:) = 0._wp
[3294]	92
[15]	93	IF( ln_rstart ) THEN ! Restart from a file
[3]	94	! ! -------------------
	95	CALL rst_read ! Read the restart file
[1130]	96	CALL day_init ! model calendar (using both namelist and restart infos)
[3]	97	ELSE
	98	! ! Start from rest
	99	! ! ---------------
[1130]	100	numror = 0 ! define numror = 0 -> no restart file to read
[3]	101	neuler = 0 ! Set time-step indicator at nit000 (euler forward)
[1130]	102	CALL day_init ! model calendar (using both namelist and restart infos)
[508]	103	! ! Initialization of ocean to zero
[3294]	104	! before fields ! now fields
	105	sshb (:,:) = 0._wp ; sshn (:,:) = 0._wp
	106	ub (:,:,:) = 0._wp ; un (:,:,:) = 0._wp
	107	vb (:,:,:) = 0._wp ; vn (:,:,:) = 0._wp
	108	rotb (:,:,:) = 0._wp ; rotn (:,:,:) = 0._wp
	109	hdivb(:,:,:) = 0._wp ; hdivn(:,:,:) = 0._wp
[508]	110	!
[3]	111	IF( cp_cfg == 'eel' ) THEN
[2104]	112	CALL istate_eel ! EEL configuration : start from pre-defined U,V T-S fields
[434]	113	ELSEIF( cp_cfg == 'gyre' ) THEN
[2104]	114	CALL istate_gyre ! GYRE configuration : start from pre-defined T-S fields
[4990]	115	ELSEIF( cp_cfg == 'isomip' .OR. cp_cfg == 'isomip2') THEN
	116	IF(lwp) WRITE(numout,*) 'Initialization of T+S for ISOMIP domain'
	117	tsn(:,:,:,jp_tem)=-1.9*tmask(:,:,:) ! ISOMIP configuration : start from constant T+S fields
	118	tsn(:,:,:,jp_sal)=34.4*tmask(:,:,:)
	119	tsb(:,:,:,:)=tsn(:,:,:,:)
[4245]	120	ELSE ! Initial T-S, U-V fields read in files
	121	IF ( ln_tsd_init ) THEN ! read 3D T and S data at nit000
	122	CALL dta_tsd( nit000, tsb )
	123	tsn(:,:,:,:) = tsb(:,:,:,:)
	124	!
	125	ELSE ! Initial T-S fields defined analytically
	126	CALL istate_t_s
	127	ENDIF
	128	IF ( ln_uvd_init .AND. lk_c1d ) THEN ! read 3D U and V data at nit000
	129	CALL wrk_alloc( jpi, jpj, jpk, 2, zuvd )
	130	CALL dta_uvd( nit000, zuvd )
	131	ub(:,:,:) = zuvd(:,:,:,1) ; un(:,:,:) = ub(:,:,:)
	132	vb(:,:,:) = zuvd(:,:,:,2) ; vn(:,:,:) = vb(:,:,:)
	133	CALL wrk_dealloc( jpi, jpj, jpk, 2, zuvd )
	134	ENDIF
[3]	135	ENDIF
[2104]	136	!
[4313]	137	CALL eos( tsb, rhd, rhop, gdept_0(:,:,:) ) ! before potential and in situ densities
[2236]	138	#if ! defined key_c1d
[5104]	139	IF( ln_zps .AND. .NOT. ln_isfcav) &
	140	& CALL zps_hde ( nit000, jpts, tsb, gtsu, gtsv, & ! Partial steps: before horizontal gradient
[5098]	141	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
[5111]	142	IF( ln_zps .AND. ln_isfcav) &
[5098]	143	& CALL zps_hde_isf( nit000, jpts, tsb, gtsu, gtsv, & ! Partial steps for top cell (ISF)
	144	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
	145	& gtui, gtvi, grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi ) ! of t, s, rd at the last ocean level
[2236]	146	#endif
[2148]	147	!
	148	! - ML - sshn could be modified by istate_eel, so that initialization of fse3t_b is done here
	149	IF( lk_vvl ) THEN
	150	DO jk = 1, jpk
	151	fse3t_b(:,:,jk) = fse3t_n(:,:,jk)
	152	ENDDO
	153	ENDIF
	154	!
[3]	155	ENDIF
[1438]	156	!
[2104]	157	IF( lk_agrif ) THEN ! read free surface arrays in restart file
[593]	158	IF( ln_rstart ) THEN
[3764]	159	IF( lk_dynspg_flt ) THEN ! read or initialize the following fields
	160	! ! gcx, gcxb for agrif_opa_init
	161	IF( sol_oce_alloc() > 0 ) CALL ctl_stop('agrif sol_oce_alloc: allocation of arrays failed')
	162	CALL flt_rst( nit000, 'READ' )
	163	ENDIF
	164	ENDIF ! explicit case not coded yet with AGRIF
[1200]	165	ENDIF
[508]	166	!
[4354]	167	!
	168	! Initialize "now" and "before" barotropic velocities:
	169	! Do it whatever the free surface method, these arrays
	170	! being eventually used
	171	!
	172	!
	173	un_b(:,:) = 0._wp ; vn_b(:,:) = 0._wp
	174	ub_b(:,:) = 0._wp ; vb_b(:,:) = 0._wp
	175	!
	176	DO jk = 1, jpkm1
	177	DO jj = 1, jpj
	178	DO ji = 1, jpi
	179	un_b(ji,jj) = un_b(ji,jj) + fse3u_n(ji,jj,jk) * un(ji,jj,jk) * umask(ji,jj,jk)
	180	vn_b(ji,jj) = vn_b(ji,jj) + fse3v_n(ji,jj,jk) * vn(ji,jj,jk) * vmask(ji,jj,jk)
	181	!
[4370]	182	ub_b(ji,jj) = ub_b(ji,jj) + fse3u_b(ji,jj,jk) * ub(ji,jj,jk) * umask(ji,jj,jk)
	183	vb_b(ji,jj) = vb_b(ji,jj) + fse3v_b(ji,jj,jk) * vb(ji,jj,jk) * vmask(ji,jj,jk)
[4354]	184	END DO
	185	END DO
	186	END DO
	187	!
[4370]	188	un_b(:,:) = un_b(:,:) * hur (:,:)
	189	vn_b(:,:) = vn_b(:,:) * hvr (:,:)
[4354]	190	!
[4370]	191	ub_b(:,:) = ub_b(:,:) * hur_b(:,:)
	192	vb_b(:,:) = vb_b(:,:) * hvr_b(:,:)
[4354]	193	!
	194	!
[4990]	195	IF( nn_timing == 1 ) CALL timing_stop('istate_init')
[3294]	196	!
[3]	197	END SUBROUTINE istate_init
	198
[4990]	199
[3294]	200	SUBROUTINE istate_t_s
[3]	201	!!---------------------------------------------------------------------
[3294]	202	!! * ROUTINE istate_t_s *
[3]	203	!!
	204	!! ** Purpose : Intialization of the temperature field with an
	205	!! analytical profile or a file (i.e. in EEL configuration)
	206	!!
[3294]	207	!! ** Method : - temperature: use Philander analytic profile
	208	!! - salinity : use to a constant value 35.5
[3]	209	!!
	210	!! References : Philander ???
	211	!!----------------------------------------------------------------------
[3294]	212	INTEGER :: ji, jj, jk
	213	REAL(wp) :: zsal = 35.50
[3]	214	!!----------------------------------------------------------------------
[508]	215	!
[3]	216	IF(lwp) WRITE(numout,*)
[3294]	217	IF(lwp) WRITE(numout,*) 'istate_t_s : Philander s initial temperature profile'
	218	IF(lwp) WRITE(numout,*) '~~~~~~~~~~ and constant salinity (',zsal,' psu)'
[2104]	219	!
[3]	220	DO jk = 1, jpk
[3294]	221	tsn(:,:,jk,jp_tem) = ( ( ( 7.5 - 0. * ABS( gphit(:,:) )/30. ) * ( 1.-TANH((fsdept(:,:,jk)-80.)/30.) ) &
	222	& + 10. * ( 5000. - fsdept(:,:,jk) ) /5000.) ) * tmask(:,:,jk)
	223	tsb(:,:,jk,jp_tem) = tsn(:,:,jk,jp_tem)
[3]	224	END DO
[3294]	225	tsn(:,:,:,jp_sal) = zsal * tmask(:,:,:)
	226	tsb(:,:,:,jp_sal) = tsn(:,:,:,jp_sal)
[2104]	227	!
[3294]	228	END SUBROUTINE istate_t_s
[3]	229
[4990]	230
[3]	231	SUBROUTINE istate_eel
	232	!!----------------------------------------------------------------------
	233	!! * ROUTINE istate_eel *
	234	!!
	235	!! ** Purpose : Initialization of the dynamics and tracers for EEL R5
	236	!! configuration (channel with or without a topographic bump)
	237	!!
	238	!! ** Method : - set temprature field
	239	!! - set salinity field
	240	!! - set velocity field including horizontal divergence
	241	!! and relative vorticity fields
	242	!!----------------------------------------------------------------------
	243	USE divcur ! hor. divergence & rel. vorticity (div_cur routine)
[473]	244	USE iom
[4990]	245	!
[3]	246	INTEGER :: inum ! temporary logical unit
	247	INTEGER :: ji, jj, jk ! dummy loop indices
[479]	248	INTEGER :: ijloc
[508]	249	REAL(wp) :: zh1, zh2, zslope, zcst, zfcor ! temporary scalars
[2104]	250	REAL(wp) :: zt1 = 15._wp ! surface temperature value (EEL R5)
	251	REAL(wp) :: zt2 = 5._wp ! bottom temperature value (EEL R5)
	252	REAL(wp) :: zsal = 35.0_wp ! constant salinity (EEL R2, R5 and R6)
	253	REAL(wp) :: zueel = 0.1_wp ! constant uniform zonal velocity (EEL R5)
[508]	254	REAL(wp), DIMENSION(jpiglo,jpjglo) :: zssh ! initial ssh over the global domain
[3]	255	!!----------------------------------------------------------------------
[4990]	256	!
[3]	257	SELECT CASE ( jp_cfg )
	258	! ! ====================
	259	CASE ( 5 ) ! EEL R5 configuration
	260	! ! ====================
[2104]	261	!
[3]	262	! set temperature field with a linear profile
	263	! -------------------------------------------
	264	IF(lwp) WRITE(numout,*)
	265	IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: linear temperature profile'
	266	IF(lwp) WRITE(numout,*) '~~~~~~~~~~'
[2104]	267	!
[4292]	268	zh1 = gdept_1d( 1 )
	269	zh2 = gdept_1d(jpkm1)
[2104]	270	!
[3]	271	zslope = ( zt1 - zt2 ) / ( zh1 - zh2 )
	272	zcst = ( zt1 * ( zh1 - zh2) - ( zt1 - zt2 ) * zh1 ) / ( zh1 - zh2 )
[2104]	273	!
[3]	274	DO jk = 1, jpk
[3294]	275	tsn(:,:,jk,jp_tem) = ( zt2 + zt1 * exp( - fsdept(:,:,jk) / 1000 ) ) * tmask(:,:,jk)
	276	tsb(:,:,jk,jp_tem) = tsn(:,:,jk,jp_tem)
[3]	277	END DO
[2104]	278	!
[3294]	279	IF(lwp) CALL prizre( tsn(:,:,:,jp_tem), jpi , jpj , jpk , jpj/2 , &
	280	& 1 , jpi , 5 , 1 , jpk , &
	281	& 1 , 1. , numout )
[2104]	282	!
[3]	283	! set salinity field to a constant value
	284	! --------------------------------------
	285	IF(lwp) WRITE(numout,*)
	286	IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: constant salinity field, S = ', zsal
	287	IF(lwp) WRITE(numout,*) '~~~~~~~~~~'
[2104]	288	!
[3294]	289	tsn(:,:,:,jp_sal) = zsal * tmask(:,:,:)
	290	tsb(:,:,:,jp_sal) = tsn(:,:,:,jp_sal)
[2104]	291	!
[3]	292	! set the dynamics: U,V, hdiv, rot (and ssh if necessary)
	293	! ----------------
	294	! Start EEL5 configuration with barotropic geostrophic velocities
	295	! according the sshb and sshn SSH imposed.
[479]	296	! we assume a uniform grid (hence the use of e1t(1,1) for delta_y)
	297	! we use the Coriolis frequency at mid-channel.
	298	ub(:,:,:) = zueel * umask(:,:,:)
[3]	299	un(:,:,:) = ub(:,:,:)
[479]	300	ijloc = mj0(INT(jpjglo-1)/2)
	301	zfcor = ff(1,ijloc)
[2104]	302	!
[3]	303	DO jj = 1, jpjglo
[479]	304	zssh(:,jj) = - (FLOAT(jj)- FLOAT(jpjglo-1)/2.)zueele1t(1,1)*zfcor/grav
[3]	305	END DO
[2104]	306	!
[479]	307	IF(lwp) THEN
	308	WRITE(numout,*) ' Uniform zonal velocity for EEL R5:',zueel
	309	WRITE(numout,*) ' Geostrophic SSH profile as a function of y:'
	310	WRITE(numout,'(12(1x,f6.2))') zssh(1,:)
	311	ENDIF
[2104]	312	!
[3]	313	DO jj = 1, nlcj
	314	DO ji = 1, nlci
	315	sshb(ji,jj) = zssh( mig(ji) , mjg(jj) ) * tmask(ji,jj,1)
	316	END DO
	317	END DO
	318	sshb(nlci+1:jpi, : ) = 0.e0 ! set to zero extra mpp columns
	319	sshb( : ,nlcj+1:jpj) = 0.e0 ! set to zero extra mpp rows
[2104]	320	!
[3]	321	sshn(:,:) = sshb(:,:) ! set now ssh to the before value
[2104]	322	!
[593]	323	IF( nn_rstssh /= 0 ) THEN
[2104]	324	nn_rstssh = 0 ! hand-made initilization of ssh
[593]	325	CALL ctl_warn( 'istate_eel: force nn_rstssh = 0' )
[558]	326	ENDIF
[2104]	327	!
	328	CALL div_cur( nit000 ) ! horizontal divergence and relative vorticity (curl)
[3]	329	! N.B. the vertical velocity will be computed from the horizontal divergence field
	330	! in istate by a call to wzv routine
	331
	332
	333	! ! ==========================
	334	CASE ( 2 , 6 ) ! EEL R2 or R6 configuration
	335	! ! ==========================
[2104]	336	!
[3]	337	! set temperature field with a NetCDF file
	338	! ----------------------------------------
	339	IF(lwp) WRITE(numout,*)
	340	IF(lwp) WRITE(numout,*) 'istate_eel : EEL R2 or R6: read initial temperature in a NetCDF file'
	341	IF(lwp) WRITE(numout,*) '~~~~~~~~~~'
[2104]	342	!
[473]	343	CALL iom_open ( 'eel.initemp', inum )
[3294]	344	CALL iom_get ( inum, jpdom_data, 'initemp', tsb(:,:,:,jp_tem) ) ! read before temprature (tb)
[473]	345	CALL iom_close( inum )
[2104]	346	!
[3294]	347	tsn(:,:,:,jp_tem) = tsb(:,:,:,jp_tem) ! set nox temperature to tb
[2104]	348	!
[3294]	349	IF(lwp) CALL prizre( tsn(:,:,:,jp_tem), jpi , jpj , jpk , jpj/2 , &
	350	& 1 , jpi , 5 , 1 , jpk , &
	351	& 1 , 1. , numout )
[2104]	352	!
[3]	353	! set salinity field to a constant value
	354	! --------------------------------------
	355	IF(lwp) WRITE(numout,*)
	356	IF(lwp) WRITE(numout,*) 'istate_eel : EEL R5: constant salinity field, S = ', zsal
	357	IF(lwp) WRITE(numout,*) '~~~~~~~~~~'
[2104]	358	!
[3294]	359	tsn(:,:,:,jp_sal) = zsal * tmask(:,:,:)
	360	tsb(:,:,:,jp_sal) = tsn(:,:,:,jp_sal)
[2104]	361	!
[3]	362	! ! ===========================
	363	CASE DEFAULT ! NONE existing configuration
	364	! ! ===========================
[473]	365	WRITE(ctmp1,*) 'EEL with a ', jp_cfg,' km resolution is not coded'
	366	CALL ctl_stop( ctmp1 )
[2104]	367	!
[3]	368	END SELECT
[2104]	369	!
[3]	370	END SUBROUTINE istate_eel
	371
	372
[93]	373	SUBROUTINE istate_gyre
	374	!!----------------------------------------------------------------------
	375	!! * ROUTINE istate_gyre *
	376	!!
	377	!! ** Purpose : Initialization of the dynamics and tracers for GYRE
	378	!! configuration (double gyre with rotated domain)
	379	!!
	380	!! ** Method : - set temprature field
	381	!! - set salinity field
	382	!!----------------------------------------------------------------------
[473]	383	INTEGER :: ji, jj, jk ! dummy loop indices
[508]	384	INTEGER :: inum ! temporary logical unit
	385	INTEGER, PARAMETER :: ntsinit = 0 ! (0/1) (analytical/input data files) T&S initialization
[93]	386	!!----------------------------------------------------------------------
[4990]	387	!
[434]	388	SELECT CASE ( ntsinit)
[4990]	389	!
[434]	390	CASE ( 0 ) ! analytical T/S profil deduced from LEVITUS
	391	IF(lwp) WRITE(numout,*)
	392	IF(lwp) WRITE(numout,*) 'istate_gyre : initial analytical T and S profil deduced from LEVITUS '
	393	IF(lwp) WRITE(numout,*) '~~~~~~~~~~~'
[4990]	394	!
[434]	395	DO jk = 1, jpk
	396	DO jj = 1, jpj
	397	DO ji = 1, jpi
[3294]	398	tsn(ji,jj,jk,jp_tem) = ( 16. - 12. * TANH( (fsdept(ji,jj,jk) - 400) / 700 ) ) &
[434]	399	& * (-TANH( (500-fsdept(ji,jj,jk)) / 150 ) + 1) / 2 &
	400	& + ( 15. * ( 1. - TANH( (fsdept(ji,jj,jk)-50.) / 1500.) ) &
	401	& - 1.4 * TANH((fsdept(ji,jj,jk)-100.) / 100.) &
	402	& + 7. * (1500. - fsdept(ji,jj,jk)) / 1500. ) &
	403	& * (-TANH( (fsdept(ji,jj,jk) - 500) / 150) + 1) / 2
[3294]	404	tsn(ji,jj,jk,jp_tem) = tsn(ji,jj,jk,jp_tem) * tmask(ji,jj,jk)
	405	tsb(ji,jj,jk,jp_tem) = tsn(ji,jj,jk,jp_tem)
[434]	406
[3294]	407	tsn(ji,jj,jk,jp_sal) = ( 36.25 - 1.13 * TANH( (fsdept(ji,jj,jk) - 305) / 460 ) ) &
[434]	408	& * (-TANH((500 - fsdept(ji,jj,jk)) / 150) + 1) / 2 &
	409	& + ( 35.55 + 1.25 * (5000. - fsdept(ji,jj,jk)) / 5000. &
	410	& - 1.62 * TANH( (fsdept(ji,jj,jk) - 60. ) / 650. ) &
	411	& + 0.2 * TANH( (fsdept(ji,jj,jk) - 35. ) / 100. ) &
	412	& + 0.2 * TANH( (fsdept(ji,jj,jk) - 1000.) / 5000.) ) &
	413	& * (-TANH((fsdept(ji,jj,jk) - 500) / 150) + 1) / 2
[3294]	414	tsn(ji,jj,jk,jp_sal) = tsn(ji,jj,jk,jp_sal) * tmask(ji,jj,jk)
	415	tsb(ji,jj,jk,jp_sal) = tsn(ji,jj,jk,jp_sal)
[434]	416	END DO
[93]	417	END DO
	418	END DO
[4990]	419	!
[434]	420	CASE ( 1 ) ! T/S data fields read in dta_tem.nc/data_sal.nc files
	421	IF(lwp) WRITE(numout,*)
	422	IF(lwp) WRITE(numout,*) 'istate_gyre : initial T and S read from dta_tem.nc/data_sal.nc files'
	423	IF(lwp) WRITE(numout,*) '~~~~~~~~~~~'
	424	IF(lwp) WRITE(numout,*) ' NetCDF FORMAT'
	425
	426	! Read temperature field
	427	! ----------------------
[473]	428	CALL iom_open ( 'data_tem', inum )
[3294]	429	CALL iom_get ( inum, jpdom_data, 'votemper', tsn(:,:,:,jp_tem) )
[473]	430	CALL iom_close( inum )
[434]	431
[3294]	432	tsn(:,:,:,jp_tem) = tsn(:,:,:,jp_tem) * tmask(:,:,:)
	433	tsb(:,:,:,jp_tem) = tsn(:,:,:,jp_tem)
[434]	434
	435	! Read salinity field
	436	! -------------------
[473]	437	CALL iom_open ( 'data_sal', inum )
[3294]	438	CALL iom_get ( inum, jpdom_data, 'vosaline', tsn(:,:,:,jp_sal) )
[473]	439	CALL iom_close( inum )
[434]	440
[3294]	441	tsn(:,:,:,jp_sal) = tsn(:,:,:,jp_sal) * tmask(:,:,:)
	442	tsb(:,:,:,jp_sal) = tsn(:,:,:,jp_sal)
[4990]	443	!
[434]	444	END SELECT
[4990]	445	!
[93]	446	IF(lwp) THEN
	447	WRITE(numout,*)
	448	WRITE(numout,*) ' Initial temperature and salinity profiles:'
[4292]	449	WRITE(numout, "(9x,' level gdept_1d temperature salinity ')" )
	450	WRITE(numout, "(10x, i4, 3f10.2)" ) ( jk, gdept_1d(jk), tsn(2,2,jk,jp_tem), tsn(2,2,jk,jp_sal), jk = 1, jpk )
[93]	451	ENDIF
[4990]	452	!
[93]	453	END SUBROUTINE istate_gyre
	454
[4990]	455
[3]	456	SUBROUTINE istate_uvg
	457	!!----------------------------------------------------------------------
	458	!! * ROUTINE istate_uvg *
	459	!!
	460	!! ** Purpose : Compute the geostrophic velocities from (tn,sn) fields
	461	!!
	462	!! ** Method : Using the hydrostatic hypothesis the now hydrostatic
	463	!! pressure is computed by integrating the in-situ density from the
	464	!! surface to the bottom.
	465	!! p=integral [ rau*g dz ]
	466	!!----------------------------------------------------------------------
[359]	467	USE dynspg ! surface pressure gradient (dyn_spg routine)
[3]	468	USE divcur ! hor. divergence & rel. vorticity (div_cur routine)
	469	USE lbclnk ! ocean lateral boundary condition (or mpp link)
[4990]	470	!
[3]	471	INTEGER :: ji, jj, jk ! dummy loop indices
	472	INTEGER :: indic ! ???
[508]	473	REAL(wp) :: zmsv, zphv, zmsu, zphu, zalfg ! temporary scalars
[3294]	474	REAL(wp), POINTER, DIMENSION(:,:,:) :: zprn
[3]	475	!!----------------------------------------------------------------------
[3294]	476	!
	477	CALL wrk_alloc( jpi, jpj, jpk, zprn)
	478	!
[3]	479	IF(lwp) WRITE(numout,*)
	480	IF(lwp) WRITE(numout,*) 'istate_uvg : Start from Geostrophy'
	481	IF(lwp) WRITE(numout,*) '~~~~~~~~~~'
	482
	483	! Compute the now hydrostatic pressure
	484	! ------------------------------------
	485
[15]	486	zalfg = 0.5 * grav * rau0
[508]	487
	488	zprn(:,:,1) = zalfg * fse3w(:,:,1) * ( 1 + rhd(:,:,1) ) ! Surface value
[3]	489
[508]	490	DO jk = 2, jpkm1 ! Vertical integration from the surface
[3]	491	zprn(:,:,jk) = zprn(:,:,jk-1) &
[359]	492	& + zalfg * fse3w(:,:,jk) * ( 2. + rhd(:,:,jk) + rhd(:,:,jk-1) )
[3]	493	END DO
	494
	495	! Compute geostrophic balance
	496	! ---------------------------
	497	DO jk = 1, jpkm1
	498	DO jj = 2, jpjm1
	499	DO ji = fs_2, fs_jpim1 ! vertor opt.
	500	zmsv = 1. / MAX( umask(ji-1,jj+1,jk) + umask(ji ,jj+1,jk) &
	501	+ umask(ji-1,jj ,jk) + umask(ji ,jj ,jk) , 1. )
	502	zphv = ( zprn(ji ,jj+1,jk) - zprn(ji-1,jj+1,jk) ) * umask(ji-1,jj+1,jk) / e1u(ji-1,jj+1) &
	503	+ ( zprn(ji+1,jj+1,jk) - zprn(ji ,jj+1,jk) ) * umask(ji ,jj+1,jk) / e1u(ji ,jj+1) &
	504	+ ( zprn(ji ,jj ,jk) - zprn(ji-1,jj ,jk) ) * umask(ji-1,jj ,jk) / e1u(ji-1,jj ) &
	505	+ ( zprn(ji+1,jj ,jk) - zprn(ji ,jj ,jk) ) * umask(ji ,jj ,jk) / e1u(ji ,jj )
	506	zphv = 1. / rau0 * zphv * zmsv * vmask(ji,jj,jk)
	507
	508	zmsu = 1. / MAX( vmask(ji+1,jj ,jk) + vmask(ji ,jj ,jk) &
	509	+ vmask(ji+1,jj-1,jk) + vmask(ji ,jj-1,jk) , 1. )
	510	zphu = ( zprn(ji+1,jj+1,jk) - zprn(ji+1,jj ,jk) ) * vmask(ji+1,jj ,jk) / e2v(ji+1,jj ) &
	511	+ ( zprn(ji ,jj+1,jk) - zprn(ji ,jj ,jk) ) * vmask(ji ,jj ,jk) / e2v(ji ,jj ) &
	512	+ ( zprn(ji+1,jj ,jk) - zprn(ji+1,jj-1,jk) ) * vmask(ji+1,jj-1,jk) / e2v(ji+1,jj-1) &
	513	+ ( zprn(ji ,jj ,jk) - zprn(ji ,jj-1,jk) ) * vmask(ji ,jj-1,jk) / e2v(ji ,jj-1)
	514	zphu = 1. / rau0 * zphu * zmsu * umask(ji,jj,jk)
	515
	516	! Compute the geostrophic velocities
	517	un(ji,jj,jk) = -2. * zphu / ( ff(ji,jj) + ff(ji ,jj-1) )
	518	vn(ji,jj,jk) = 2. * zphv / ( ff(ji,jj) + ff(ji-1,jj ) )
	519	END DO
	520	END DO
	521	END DO
	522
	523	IF(lwp) WRITE(numout,*) ' we force to zero bottom velocity'
	524
	525	! Susbtract the bottom velocity (level jpk-1 for flat bottom case)
	526	! to have a zero bottom velocity
	527
	528	DO jk = 1, jpkm1
	529	un(:,:,jk) = ( un(:,:,jk) - un(:,:,jpkm1) ) * umask(:,:,jk)
	530	vn(:,:,jk) = ( vn(:,:,jk) - vn(:,:,jpkm1) ) * vmask(:,:,jk)
	531	END DO
	532
	533	CALL lbc_lnk( un, 'U', -1. )
	534	CALL lbc_lnk( vn, 'V', -1. )
	535
	536	ub(:,:,:) = un(:,:,:)
	537	vb(:,:,:) = vn(:,:,:)
	538
	539	! WARNING !!!!!
	540	! after initializing u and v, we need to calculate the initial streamfunction bsf.
	541	! Otherwise, only the trend will be computed and the model will blow up (inconsistency).
	542	! to do that, we call dyn_spg with a special trick:
[508]	543	! we fill ua and va with the velocities divided by dt, and the streamfunction will be brought to the
	544	! right value assuming the velocities have been set up in one time step.
	545	! we then set bsfd to zero (first guess for next step is d(psi)/dt = 0.)
	546	! sets up s false trend to calculate the barotropic streamfunction.
[3]	547
	548	ua(:,:,:) = ub(:,:,:) / rdt
	549	va(:,:,:) = vb(:,:,:) / rdt
	550
[359]	551	! calls dyn_spg. we assume euler time step, starting from rest.
[3]	552	indic = 0
[359]	553	CALL dyn_spg( nit000, indic ) ! surface pressure gradient
[3]	554
	555	! the new velocity is ua*rdt
	556
	557	CALL lbc_lnk( ua, 'U', -1. )
	558	CALL lbc_lnk( va, 'V', -1. )
	559
	560	ub(:,:,:) = ua(:,:,:) * rdt
	561	vb(:,:,:) = va(:,:,:) * rdt
	562	ua(:,:,:) = 0.e0
	563	va(:,:,:) = 0.e0
	564	un(:,:,:) = ub(:,:,:)
	565	vn(:,:,:) = vb(:,:,:)
	566
	567	! Compute the divergence and curl
	568
	569	CALL div_cur( nit000 ) ! now horizontal divergence and curl
	570
	571	hdivb(:,:,:) = hdivn(:,:,:) ! set the before to the now value
	572	rotb (:,:,:) = rotn (:,:,:) ! set the before to the now value
[508]	573	!
[3294]	574	CALL wrk_dealloc( jpi, jpj, jpk, zprn)
[2715]	575	!
[3]	576	END SUBROUTINE istate_uvg
	577
	578	!!=====================================================================
	579	END MODULE istate

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