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sbcisf.F90 in branches/2017/dev_merge_2017/NEMOGCM/NEMO/OPA_SRC/SBC – NEMO

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source: branches/2017/dev_merge_2017/NEMOGCM/NEMO/OPA_SRC/SBC/sbcisf.F90 @ 9213

Last change on this file since 9213 was 9168, checked in by gm, 6 years ago
dev_merge_2017: OPA_SRC & CONFIG: remove useless warning when reading namelist_cfg
Property svn:keywords set to `Id`
File size: 44.7 KB

Rev	Line
[4666]	1	MODULE sbcisf
	2	!!======================================================================
	3	!! * MODULE sbcisf *
	4	!! Surface module : update surface ocean boundary condition under ice
	5	!! shelf
	6	!!======================================================================
[9019]	7	!! History : 3.2 ! 2011-02 (C.Harris ) Original code isf cav
	8	!! X.X ! 2006-02 (C. Wang ) Original code bg03
	9	!! 3.4 ! 2013-03 (P. Mathiot) Merging + parametrization
[4666]	10	!!----------------------------------------------------------------------
	11
	12	!!----------------------------------------------------------------------
[9019]	13	!! sbc_isf : update sbc under ice shelf
[4666]	14	!!----------------------------------------------------------------------
[9019]	15	USE oce ! ocean dynamics and tracers
	16	USE dom_oce ! ocean space and time domain
	17	USE phycst ! physical constants
	18	USE eosbn2 ! equation of state
	19	USE sbc_oce ! surface boundary condition: ocean fields
	20	USE zdfdrg ! vertical physics: top/bottom drag coef.
[5836]	21	!
[9019]	22	USE in_out_manager ! I/O manager
	23	USE iom ! I/O library
	24	USE fldread ! read input field at current time step
	25	USE lbclnk !
	26	USE lib_fortran ! glob_sum
[4666]	27
	28	IMPLICIT NONE
	29	PRIVATE
	30
[7816]	31	PUBLIC sbc_isf, sbc_isf_init, sbc_isf_div, sbc_isf_alloc ! routine called in sbcmod and divhor
[4666]	32
	33	! public in order to be able to output then
	34
	35	REAL(wp), PUBLIC :: rn_hisf_tbl !: thickness of top boundary layer [m]
[6140]	36	INTEGER , PUBLIC :: nn_isf !: flag to choose between explicit/param/specified
	37	INTEGER , PUBLIC :: nn_isfblk !: flag to choose the bulk formulation to compute the ice shelf melting
	38	INTEGER , PUBLIC :: nn_gammablk !: flag to choose how the exchange coefficient is computed
	39	REAL(wp), PUBLIC :: rn_gammat0 !: temperature exchange coeficient []
	40	REAL(wp), PUBLIC :: rn_gammas0 !: salinity exchange coeficient []
[4666]	41
[9019]	42	INTEGER , PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: misfkt , misfkb !: Level of ice shelf base
	43	REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: rzisf_tbl !: depth of calving front (shallowest point) nn_isf ==2/3
	44	REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: rhisf_tbl, rhisf_tbl_0 !: thickness of tbl [m]
	45	REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: r1_hisf_tbl !: 1/thickness of tbl
	46	REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: ralpha !: proportion of bottom cell influenced by tbl
	47	REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: risfLeff !: effective length (Leff) BG03 nn_isf==2
	48	REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: ttbl, stbl, utbl, vtbl !: top boundary layer variable at T point
	49	REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: qisf !: net heat flux from ice shelf [W/m2]
	50	REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: risf_tsc_b, risf_tsc !: before and now T & S isf contents [K.m/s & PSU.m/s]
[4666]	51
[9019]	52	LOGICAL, PUBLIC :: l_isfcpl = .false. !: isf recieved from oasis
[7788]	53
[9019]	54	REAL(wp), PUBLIC, SAVE :: rcpi = 2000.0_wp !: specific heat of ice shelf [J/kg/K]
	55	REAL(wp), PUBLIC, SAVE :: rkappa = 1.54e-6_wp !: heat diffusivity through the ice-shelf [m2/s]
	56	REAL(wp), PUBLIC, SAVE :: rhoisf = 920.0_wp !: volumic mass of ice shelf [kg/m3]
	57	REAL(wp), PUBLIC, SAVE :: tsurf = -20.0_wp !: air temperature on top of ice shelf [C]
	58	REAL(wp), PUBLIC, SAVE :: rlfusisf = 0.334e6_wp !: latent heat of fusion of ice shelf [J/kg]
[4666]	59
	60	!: Variable used in fldread to read the forcing file (nn_isf == 4 .OR. nn_isf == 3)
[6140]	61	CHARACTER(len=100), PUBLIC :: cn_dirisf = './' !: Root directory for location of ssr files
	62	TYPE(FLD_N) , PUBLIC :: sn_fwfisf !: information about the isf melting file to be read
	63	TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf_fwfisf
	64	TYPE(FLD_N) , PUBLIC :: sn_rnfisf !: information about the isf melting param. file to be read
	65	TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf_rnfisf
	66	TYPE(FLD_N) , PUBLIC :: sn_depmax_isf !: information about the grounding line depth file to be read
	67	TYPE(FLD_N) , PUBLIC :: sn_depmin_isf !: information about the calving line depth file to be read
	68	TYPE(FLD_N) , PUBLIC :: sn_Leff_isf !: information about the effective length file to be read
[4666]	69
	70	!!----------------------------------------------------------------------
[9019]	71	!! NEMO/OPA 4.0 , LOCEAN-IPSL (2017)
[5215]	72	!! $Id$
[4666]	73	!! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt)
	74	!!----------------------------------------------------------------------
	75	CONTAINS
	76
[9019]	77	SUBROUTINE sbc_isf( kt )
[5836]	78	!!---------------------------------------------------------------------
[6140]	79	!! * ROUTINE sbc_isf *
	80	!!
	81	!! ** Purpose : Compute Salt and Heat fluxes related to ice_shelf
	82	!! melting and freezing
	83	!!
	84	!! ** Method : 4 parameterizations are available according to nn_isf
	85	!! nn_isf = 1 : Realistic ice_shelf formulation
	86	!! 2 : Beckmann & Goose parameterization
	87	!! 3 : Specified runoff in deptht (Mathiot & al. )
	88	!! 4 : specified fwf and heat flux forcing beneath the ice shelf
	89	!!----------------------------------------------------------------------
[9019]	90	INTEGER, INTENT(in) :: kt ! ocean time step
[4666]	91	!
[9019]	92	INTEGER :: ji, jj, jk ! loop index
	93	INTEGER :: ikt, ikb ! local integers
	94	REAL(wp), DIMENSION(jpi,jpj) :: zt_frz, zdep ! freezing temperature (zt_frz) at depth (zdep)
	95	REAL(wp), DIMENSION(:,:) , ALLOCATABLE :: zqhcisf2d
	96	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: zfwfisf3d, zqhcisf3d, zqlatisf3d
[4666]	97	!!---------------------------------------------------------------------
	98	!
[9019]	99	IF( MOD( kt-1, nn_fsbc) == 0 ) THEN ! compute salt and heat flux
	100	!
[6140]	101	SELECT CASE ( nn_isf )
	102	CASE ( 1 ) ! realistic ice shelf formulation
[4666]	103	! compute T/S/U/V for the top boundary layer
	104	CALL sbc_isf_tbl(tsn(:,:,:,jp_tem),ttbl(:,:),'T')
	105	CALL sbc_isf_tbl(tsn(:,:,:,jp_sal),stbl(:,:),'T')
[6140]	106	CALL sbc_isf_tbl(un(:,:,:) ,utbl(:,:),'U')
	107	CALL sbc_isf_tbl(vn(:,:,:) ,vtbl(:,:),'V')
[4666]	108	! iom print
	109	CALL iom_put('ttbl',ttbl(:,:))
	110	CALL iom_put('stbl',stbl(:,:))
[6140]	111	CALL iom_put('utbl',utbl(:,:) * (1._wp - tmask(:,:,1)) * ssmask(:,:))
	112	CALL iom_put('vtbl',vtbl(:,:) * (1._wp - tmask(:,:,1)) * ssmask(:,:))
[4666]	113	! compute fwf and heat flux
[7788]	114	! compute fwf and heat flux
	115	IF( .NOT.l_isfcpl ) THEN ; CALL sbc_isf_cav (kt)
	116	ELSE ; qisf(:,:) = fwfisf(:,:) * rlfusisf ! heat flux
	117	ENDIF
[9019]	118	!
[6140]	119	CASE ( 2 ) ! Beckmann and Goosse parametrisation
[4666]	120	stbl(:,:) = soce
	121	CALL sbc_isf_bg03(kt)
[9019]	122	!
[6140]	123	CASE ( 3 ) ! specified runoff in depth (Mathiot et al., XXXX in preparation)
[7788]	124	! specified runoff in depth (Mathiot et al., XXXX in preparation)
	125	IF( .NOT.l_isfcpl ) THEN
	126	CALL fld_read ( kt, nn_fsbc, sf_rnfisf )
	127	fwfisf(:,:) = - sf_rnfisf(1)%fnow(:,:,1) ! fresh water flux from the isf (fwfisf <0 mean melting)
	128	ENDIF
[6140]	129	qisf(:,:) = fwfisf(:,:) * rlfusisf ! heat flux
[4666]	130	stbl(:,:) = soce
[9019]	131	!
[6140]	132	CASE ( 4 ) ! specified fwf and heat flux forcing beneath the ice shelf
[9019]	133	! ! specified fwf and heat flux forcing beneath the ice shelf
[7788]	134	IF( .NOT.l_isfcpl ) THEN
	135	CALL fld_read ( kt, nn_fsbc, sf_fwfisf )
	136	!CALL fld_read ( kt, nn_fsbc, sf_qisf )
	137	fwfisf(:,:) = -sf_fwfisf(1)%fnow(:,:,1) ! fwf
	138	ENDIF
[6140]	139	qisf(:,:) = fwfisf(:,:) * rlfusisf ! heat flux
[4666]	140	stbl(:,:) = soce
[9019]	141	!
[6140]	142	END SELECT
	143
[4666]	144	! compute tsc due to isf
[6140]	145	! isf melting implemented as a volume flux and we assume that melt water is at 0 PSU.
	146	! WARNING water add at temp = 0C, need to add a correction term (fwfisf * tfreez / rau0).
	147	! compute freezing point beneath ice shelf (or top cell if nn_isf = 3)
	148	DO jj = 1,jpj
	149	DO ji = 1,jpi
	150	zdep(ji,jj)=gdepw_n(ji,jj,misfkt(ji,jj))
	151	END DO
	152	END DO
	153	CALL eos_fzp( stbl(:,:), zt_frz(:,:), zdep(:,:) )
[4666]	154
[6140]	155	risf_tsc(:,:,jp_tem) = qisf(:,:) * r1_rau0_rcp - fwfisf(:,:) * zt_frz(:,:) * r1_rau0 !
	156	risf_tsc(:,:,jp_sal) = 0.0_wp
[5643]	157
[4666]	158	! lbclnk
[9098]	159	CALL lbc_lnk_multi( risf_tsc(:,:,jp_tem), 'T', 1., risf_tsc(:,:,jp_sal), 'T', 1., fwfisf,'T', 1., qisf, 'T', 1.)
[7788]	160	! output
[7968]	161	IF( iom_use('iceshelf_cea') ) CALL iom_put( 'iceshelf_cea', -fwfisf(:,:) ) ! isf mass flux
	162	IF( iom_use('hflx_isf_cea') ) CALL iom_put( 'hflx_isf_cea', risf_tsc(:,:,jp_tem) * rau0 * rcp ) ! isf sensible+latent heat (W/m2)
	163	IF( iom_use('qlatisf' ) ) CALL iom_put( 'qlatisf' , qisf(:,:) ) ! isf latent heat
	164	IF( iom_use('fwfisf' ) ) CALL iom_put( 'fwfisf' , fwfisf(:,:) ) ! isf mass flux (opposite sign)
[7788]	165
[9019]	166	! Diagnostics
	167	IF( iom_use('fwfisf3d') .OR. iom_use('qlatisf3d') .OR. iom_use('qhcisf3d') .OR. iom_use('qhcisf')) THEN
	168	ALLOCATE( zfwfisf3d(jpi,jpj,jpk) , zqhcisf3d(jpi,jpj,jpk) , zqlatisf3d(jpi,jpj,jpk) )
	169	ALLOCATE( zqhcisf2d(jpi,jpj) )
	170	!
	171	zfwfisf3d (:,:,:) = 0._wp ! 3d ice shelf melting (kg/m2/s)
	172	zqhcisf3d (:,:,:) = 0._wp ! 3d heat content flux (W/m2)
	173	zqlatisf3d(:,:,:) = 0._wp ! 3d ice shelf melting latent heat flux (W/m2)
	174	zqhcisf2d (:,:) = fwfisf(:,:) * zt_frz * rcp ! 2d heat content flux (W/m2)
	175	!
[7646]	176	DO jj = 1,jpj
	177	DO ji = 1,jpi
	178	ikt = misfkt(ji,jj)
	179	ikb = misfkb(ji,jj)
	180	DO jk = ikt, ikb - 1
	181	zfwfisf3d (ji,jj,jk) = zfwfisf3d (ji,jj,jk) + fwfisf (ji,jj) * r1_hisf_tbl(ji,jj) * e3t_n(ji,jj,jk)
	182	zqhcisf3d (ji,jj,jk) = zqhcisf3d (ji,jj,jk) + zqhcisf2d(ji,jj) * r1_hisf_tbl(ji,jj) * e3t_n(ji,jj,jk)
	183	zqlatisf3d(ji,jj,jk) = zqlatisf3d(ji,jj,jk) + qisf (ji,jj) * r1_hisf_tbl(ji,jj) * e3t_n(ji,jj,jk)
	184	END DO
[8329]	185	zfwfisf3d (ji,jj,jk) = zfwfisf3d (ji,jj,jk) + fwfisf (ji,jj) * r1_hisf_tbl(ji,jj) &
	186	& * ralpha(ji,jj) * e3t_n(ji,jj,jk)
	187	zqhcisf3d (ji,jj,jk) = zqhcisf3d (ji,jj,jk) + zqhcisf2d(ji,jj) * r1_hisf_tbl(ji,jj) &
	188	& * ralpha(ji,jj) * e3t_n(ji,jj,jk)
	189	zqlatisf3d(ji,jj,jk) = zqlatisf3d(ji,jj,jk) + qisf (ji,jj) * r1_hisf_tbl(ji,jj) &
	190	& * ralpha(ji,jj) * e3t_n(ji,jj,jk)
[7646]	191	END DO
	192	END DO
[9019]	193	!
[7646]	194	CALL iom_put('fwfisf3d' , zfwfisf3d (:,:,:))
	195	CALL iom_put('qlatisf3d', zqlatisf3d(:,:,:))
	196	CALL iom_put('qhcisf3d' , zqhcisf3d (:,:,:))
	197	CALL iom_put('qhcisf' , zqhcisf2d (:,: ))
[9019]	198	!
	199	DEALLOCATE( zfwfisf3d, zqhcisf3d, zqlatisf3d )
	200	DEALLOCATE( zqhcisf2d )
[7788]	201	ENDIF
	202	!
[9019]	203	ENDIF
[4666]	204
[9019]	205	IF( kt == nit000 ) THEN ! set the forcing field at nit000 - 1 !
	206	IF( ln_rstart .AND. & ! Restart: read in restart file
	207	& iom_varid( numror, 'fwf_isf_b', ldstop = .FALSE. ) > 0 ) THEN
	208	IF(lwp) WRITE(numout,*) ' nit000-1 isf tracer content forcing fields read in the restart file'
	209	CALL iom_get( numror, jpdom_autoglo, 'fwf_isf_b', fwfisf_b(:,:) ) ! before salt content isf_tsc trend
	210	CALL iom_get( numror, jpdom_autoglo, 'isf_sc_b', risf_tsc_b(:,:,jp_sal) ) ! before salt content isf_tsc trend
	211	CALL iom_get( numror, jpdom_autoglo, 'isf_hc_b', risf_tsc_b(:,:,jp_tem) ) ! before salt content isf_tsc trend
	212	ELSE
	213	fwfisf_b(:,:) = fwfisf(:,:)
	214	risf_tsc_b(:,:,:)= risf_tsc(:,:,:)
	215	ENDIF
	216	ENDIF
	217	!
	218	IF( lrst_oce ) THEN
	219	IF(lwp) WRITE(numout,*)
	220	IF(lwp) WRITE(numout,*) 'sbc : isf surface tracer content forcing fields written in ocean restart file ', &
	221	& 'at it= ', kt,' date= ', ndastp
	222	IF(lwp) WRITE(numout,*) '~~~~'
	223	CALL iom_rstput( kt, nitrst, numrow, 'fwf_isf_b', fwfisf(:,:) )
	224	CALL iom_rstput( kt, nitrst, numrow, 'isf_hc_b' , risf_tsc(:,:,jp_tem) )
	225	CALL iom_rstput( kt, nitrst, numrow, 'isf_sc_b' , risf_tsc(:,:,jp_sal) )
	226	ENDIF
	227	!
	228	END SUBROUTINE sbc_isf
[5836]	229
[9019]	230
	231	INTEGER FUNCTION sbc_isf_alloc()
[4666]	232	!!----------------------------------------------------------------------
	233	!! * FUNCTION sbc_isf_rnf_alloc *
	234	!!----------------------------------------------------------------------
	235	sbc_isf_alloc = 0 ! set to zero if no array to be allocated
	236	IF( .NOT. ALLOCATED( qisf ) ) THEN
[5120]	237	ALLOCATE( risf_tsc(jpi,jpj,jpts), risf_tsc_b(jpi,jpj,jpts), qisf(jpi,jpj) , &
	238	& rhisf_tbl(jpi,jpj) , r1_hisf_tbl(jpi,jpj), rzisf_tbl(jpi,jpj) , &
	239	& ttbl(jpi,jpj) , stbl(jpi,jpj) , utbl(jpi,jpj) , &
	240	& vtbl(jpi, jpj) , risfLeff(jpi,jpj) , rhisf_tbl_0(jpi,jpj), &
	241	& ralpha(jpi,jpj) , misfkt(jpi,jpj) , misfkb(jpi,jpj) , &
[4946]	242	& STAT= sbc_isf_alloc )
[4666]	243	!
[6140]	244	IF( lk_mpp ) CALL mpp_sum ( sbc_isf_alloc )
[4666]	245	IF( sbc_isf_alloc /= 0 ) CALL ctl_warn('sbc_isf_alloc: failed to allocate arrays.')
	246	!
[9019]	247	ENDIF
	248	END FUNCTION
[4666]	249
[9019]	250
[6140]	251	SUBROUTINE sbc_isf_init
	252	!!---------------------------------------------------------------------
	253	!! * ROUTINE sbc_isf_init *
	254	!!
	255	!! ** Purpose : Initialisation of variables for iceshelf fluxes formulation
	256	!!
	257	!! ** Method : 4 parameterizations are available according to nn_isf
	258	!! nn_isf = 1 : Realistic ice_shelf formulation
	259	!! 2 : Beckmann & Goose parameterization
	260	!! 3 : Specified runoff in deptht (Mathiot & al. )
	261	!! 4 : specified fwf and heat flux forcing beneath the ice shelf
[5836]	262	!!----------------------------------------------------------------------
[6140]	263	INTEGER :: ji, jj, jk ! loop index
	264	INTEGER :: ik ! current level index
	265	INTEGER :: ikt, ikb ! top and bottom level of the isf boundary layer
	266	INTEGER :: inum, ierror
	267	INTEGER :: ios ! Local integer output status for namelist read
	268	REAL(wp) :: zhk
	269	CHARACTER(len=256) :: cvarzisf, cvarhisf ! name for isf file
	270	CHARACTER(LEN=32 ) :: cvarLeff ! variable name for efficient Length scale
[5836]	271	!!----------------------------------------------------------------------
[6140]	272	NAMELIST/namsbc_isf/ nn_isfblk, rn_hisf_tbl, rn_gammat0, rn_gammas0, nn_gammablk, nn_isf, &
	273	& sn_fwfisf, sn_rnfisf, sn_depmax_isf, sn_depmin_isf, sn_Leff_isf
	274	!!----------------------------------------------------------------------
	275
	276	REWIND( numnam_ref ) ! Namelist namsbc_rnf in reference namelist : Runoffs
	277	READ ( numnam_ref, namsbc_isf, IOSTAT = ios, ERR = 901)
[9168]	278	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_isf in reference namelist', lwp )
[6140]	279
	280	REWIND( numnam_cfg ) ! Namelist namsbc_rnf in configuration namelist : Runoffs
	281	READ ( numnam_cfg, namsbc_isf, IOSTAT = ios, ERR = 902 )
[9168]	282	902 IF( ios > 0 ) CALL ctl_nam ( ios , 'namsbc_isf in configuration namelist', lwp )
[6140]	283	IF(lwm) WRITE ( numond, namsbc_isf )
	284
[9168]	285	IF(lwp) WRITE(numout,*)
	286	IF(lwp) WRITE(numout,*) 'sbc_isf_init : heat flux of the ice shelf'
	287	IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~'
	288	IF(lwp) WRITE(numout,*) ' Namelist namsbc_isf :'
	289	IF(lwp) WRITE(numout,*) ' type ice shelf melting/freezing nn_isf = ', nn_isf
	290	IF(lwp) WRITE(numout,*) ' bulk formulation (nn_isf=1 only) nn_isfblk = ', nn_isfblk
	291	IF(lwp) WRITE(numout,*) ' thickness of the top boundary layer rn_hisf_tbl = ', rn_hisf_tbl
	292	IF(lwp) WRITE(numout,*) ' gamma formulation nn_gammablk = ', nn_gammablk
	293	IF(lwp) WRITE(numout,*) ' gammat coefficient rn_gammat0 = ', rn_gammat0
	294	IF(lwp) WRITE(numout,*) ' gammas coefficient rn_gammas0 = ', rn_gammas0
	295	IF(lwp) WRITE(numout,*) ' top drag coef. used (from namdrg_top) rn_Cd0 = ', r_Cdmin_top
	296
	297
	298	! 1 = presence of ISF 2 = bg03 parametrisation
	299	! 3 = rnf file for isf 4 = ISF fwf specified
	300	! option 1 and 4 need ln_isfcav = .true. (domzgr)
[6140]	301	!
	302	! Allocate public variable
	303	IF ( sbc_isf_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'sbc_isf : unable to allocate arrays' )
	304	!
	305	! initialisation
[9019]	306	qisf (:,:) = 0._wp ; fwfisf (:,:) = 0._wp
	307	risf_tsc(:,:,:) = 0._wp ; fwfisf_b(:,:) = 0._wp
[6140]	308	!
	309	! define isf tbl tickness, top and bottom indice
	310	SELECT CASE ( nn_isf )
	311	CASE ( 1 )
[9168]	312	IF(lwp) WRITE(numout,*)
	313	IF(lwp) WRITE(numout,*) ' ==>>> presence of under iceshelf seas (nn_isf = 1)'
[6140]	314	rhisf_tbl(:,:) = rn_hisf_tbl
[9019]	315	misfkt (:,:) = mikt(:,:) ! same indice for bg03 et cav => used in isfdiv
[9168]	316	!
[6140]	317	CASE ( 2 , 3 )
[7788]	318	IF( .NOT.l_isfcpl ) THEN
	319	ALLOCATE( sf_rnfisf(1), STAT=ierror )
	320	ALLOCATE( sf_rnfisf(1)%fnow(jpi,jpj,1), sf_rnfisf(1)%fdta(jpi,jpj,1,2) )
	321	CALL fld_fill( sf_rnfisf, (/ sn_rnfisf /), cn_dirisf, 'sbc_isf_init', 'read fresh water flux isf data', 'namsbc_isf' )
	322	ENDIF
	323	! read effective lenght (BG03)
[9168]	324	IF( nn_isf == 2 ) THEN
	325	IF(lwp) WRITE(numout,*)
	326	IF(lwp) WRITE(numout,*) ' ==>>> bg03 parametrisation (nn_isf = 2)'
[6140]	327	CALL iom_open( sn_Leff_isf%clname, inum )
	328	cvarLeff = TRIM(sn_Leff_isf%clvar)
	329	CALL iom_get( inum, jpdom_data, cvarLeff, risfLeff , 1)
	330	CALL iom_close(inum)
	331	!
	332	risfLeff = risfLeff*1000.0_wp !: convertion in m
[9168]	333	ELSE
	334	IF(lwp) WRITE(numout,*)
	335	IF(lwp) WRITE(numout,*) ' ==>>> rnf file for isf (nn_isf = 3)'
	336	ENDIF
[6140]	337	! read depth of the top and bottom of the isf top boundary layer (in this case, isf front depth and grounding line depth)
	338	CALL iom_open( sn_depmax_isf%clname, inum )
	339	cvarhisf = TRIM(sn_depmax_isf%clvar)
	340	CALL iom_get( inum, jpdom_data, cvarhisf, rhisf_tbl, 1) !: depth of deepest point of the ice shelf base
	341	CALL iom_close(inum)
	342	!
	343	CALL iom_open( sn_depmin_isf%clname, inum )
	344	cvarzisf = TRIM(sn_depmin_isf%clvar)
	345	CALL iom_get( inum, jpdom_data, cvarzisf, rzisf_tbl, 1) !: depth of shallowest point of the ice shelves base
	346	CALL iom_close(inum)
	347	!
	348	rhisf_tbl(:,:) = rhisf_tbl(:,:) - rzisf_tbl(:,:) !: tickness isf boundary layer
	349
	350	!! compute first level of the top boundary layer
	351	DO ji = 1, jpi
	352	DO jj = 1, jpj
	353	ik = 2
[9019]	354	!!gm potential bug: use gdepw_0 not _n
[6140]	355	DO WHILE ( ik <= mbkt(ji,jj) .AND. gdepw_n(ji,jj,ik) < rzisf_tbl(ji,jj) ) ; ik = ik + 1 ; END DO
	356	misfkt(ji,jj) = ik-1
	357	END DO
	358	END DO
[9168]	359	!
[6140]	360	CASE ( 4 )
[9168]	361	IF(lwp) WRITE(numout,*)
	362	IF(lwp) WRITE(numout,*) ' ==>>> specified fresh water flux in ISF (nn_isf = 4)'
[6140]	363	! as in nn_isf == 1
	364	rhisf_tbl(:,:) = rn_hisf_tbl
[9019]	365	misfkt (:,:) = mikt(:,:) ! same indice for bg03 et cav => used in isfdiv
[9168]	366	!
[6140]	367	! load variable used in fldread (use for temporal interpolation of isf fwf forcing)
[7788]	368	IF( .NOT.l_isfcpl ) THEN
	369	ALLOCATE( sf_fwfisf(1), STAT=ierror )
	370	ALLOCATE( sf_fwfisf(1)%fnow(jpi,jpj,1), sf_fwfisf(1)%fdta(jpi,jpj,1,2) )
	371	CALL fld_fill( sf_fwfisf, (/ sn_fwfisf /), cn_dirisf, 'sbc_isf_init', 'read fresh water flux isf data', 'namsbc_isf' )
	372	ENDIF
[9168]	373	!
	374	CASE DEFAULT
	375	CALL ctl_stop( 'sbc_isf_init: wrong value of nn_isf' )
[6140]	376	END SELECT
	377
	378	rhisf_tbl_0(:,:) = rhisf_tbl(:,:)
	379
	380	! compute bottom level of isf tbl and thickness of tbl below the ice shelf
	381	DO jj = 1,jpj
	382	DO ji = 1,jpi
	383	ikt = misfkt(ji,jj)
	384	ikb = misfkt(ji,jj)
	385	! thickness of boundary layer at least the top level thickness
	386	rhisf_tbl(ji,jj) = MAX(rhisf_tbl_0(ji,jj), e3t_n(ji,jj,ikt))
	387
	388	! determine the deepest level influenced by the boundary layer
	389	DO jk = ikt+1, mbkt(ji,jj)
[9019]	390	IF( (SUM(e3t_n(ji,jj,ikt:jk-1)) < rhisf_tbl(ji,jj)) .AND. (tmask(ji,jj,jk) == 1) ) ikb = jk
[6140]	391	END DO
	392	rhisf_tbl(ji,jj) = MIN(rhisf_tbl(ji,jj), SUM(e3t_n(ji,jj,ikt:ikb))) ! limit the tbl to water thickness.
	393	misfkb(ji,jj) = ikb ! last wet level of the tbl
	394	r1_hisf_tbl(ji,jj) = 1._wp / rhisf_tbl(ji,jj)
	395
	396	zhk = SUM( e3t_n(ji, jj, ikt:ikb - 1)) * r1_hisf_tbl(ji,jj) ! proportion of tbl cover by cell from ikt to ikb - 1
	397	ralpha(ji,jj) = rhisf_tbl(ji,jj) * (1._wp - zhk ) / e3t_n(ji,jj,ikb) ! proportion of bottom cell influenced by boundary layer
	398	END DO
	399	END DO
	400
	401	END SUBROUTINE sbc_isf_init
	402
[9019]	403
[6140]	404	SUBROUTINE sbc_isf_bg03(kt)
	405	!!---------------------------------------------------------------------
	406	!! * ROUTINE sbc_isf_bg03 *
[5836]	407	!!
[6140]	408	!! ** Purpose : add net heat and fresh water flux from ice shelf melting
	409	!! into the adjacent ocean
[5836]	410	!!
[6140]	411	!! ** Method : See reference
	412	!!
	413	!! ** Reference : Beckmann and Goosse (2003), "A parameterization of ice shelf-ocean
	414	!! interaction for climate models", Ocean Modelling 5(2003) 157-170.
	415	!! (hereafter BG)
[9019]	416	!! History : 06-02 (C. Wang) Original code
[5836]	417	!!----------------------------------------------------------------------
	418	INTEGER, INTENT ( in ) :: kt
	419	!
[6140]	420	INTEGER :: ji, jj, jk ! dummy loop index
	421	INTEGER :: ik ! current level
	422	REAL(wp) :: zt_sum ! sum of the temperature between 200m and 600m
	423	REAL(wp) :: zt_ave ! averaged temperature between 200m and 600m
	424	REAL(wp) :: zt_frz ! freezing point temperature at depth z
	425	REAL(wp) :: zpress ! pressure to compute the freezing point in depth
	426	!!----------------------------------------------------------------------
	427	!
	428	DO ji = 1, jpi
	429	DO jj = 1, jpj
	430	ik = misfkt(ji,jj)
	431	!! Initialize arrays to 0 (each step)
	432	zt_sum = 0.e0_wp
	433	IF ( ik > 1 ) THEN
	434	! 1. -----------the average temperature between 200m and 600m ---------------------
	435	DO jk = misfkt(ji,jj),misfkb(ji,jj)
	436	! freezing point temperature at ice shelf base BG eq. 2 (JMM sign pb ??? +7.64e-4 !!!)
	437	! after verif with UNESCO, wrong sign in BG eq. 2
	438	! Calculate freezing temperature
	439	CALL eos_fzp(stbl(ji,jj), zt_frz, zpress)
	440	zt_sum = zt_sum + (tsn(ji,jj,jk,jp_tem)-zt_frz) * e3t_n(ji,jj,jk) * tmask(ji,jj,jk) ! sum temp
	441	END DO
	442	zt_ave = zt_sum/rhisf_tbl(ji,jj) ! calcul mean value
	443	! 2. ------------Net heat flux and fresh water flux due to the ice shelf
	444	! For those corresponding to zonal boundary
	445	qisf(ji,jj) = - rau0 * rcp * rn_gammat0 * risfLeff(ji,jj) * e1t(ji,jj) * zt_ave &
	446	& * r1_e1e2t(ji,jj) * tmask(ji,jj,jk)
[4666]	447
[6140]	448	fwfisf(ji,jj) = qisf(ji,jj) / rlfusisf !fresh water flux kg/(m2s)
	449	fwfisf(ji,jj) = fwfisf(ji,jj) * ( soce / stbl(ji,jj) )
	450	!add to salinity trend
	451	ELSE
[9019]	452	qisf(ji,jj) = 0._wp ; fwfisf(ji,jj) = 0._wp
[6140]	453	END IF
	454	END DO
	455	END DO
[5836]	456	!
[4666]	457	END SUBROUTINE sbc_isf_bg03
	458
[9019]	459
[6140]	460	SUBROUTINE sbc_isf_cav( kt )
[4666]	461	!!---------------------------------------------------------------------
	462	!! * ROUTINE sbc_isf_cav *
	463	!!
	464	!! ** Purpose : handle surface boundary condition under ice shelf
	465	!!
	466	!! ** Method : -
	467	!!
	468	!! ** Action : utau, vtau : remain unchanged
	469	!! taum, wndm : remain unchanged
	470	!! qns : update heat flux below ice shelf
	471	!! emp, emps : update freshwater flux below ice shelf
	472	!!---------------------------------------------------------------------
[9019]	473	INTEGER, INTENT(in) :: kt ! ocean time step
[4666]	474	!
[6140]	475	INTEGER :: ji, jj ! dummy loop indices
	476	INTEGER :: nit
[9019]	477	LOGICAL :: lit
[4666]	478	REAL(wp) :: zlamb1, zlamb2, zlamb3
	479	REAL(wp) :: zeps1,zeps2,zeps3,zeps4,zeps6,zeps7
	480	REAL(wp) :: zaqe,zbqe,zcqe,zaqer,zdis,zsfrz,zcfac
[6140]	481	REAL(wp) :: zeps = 1.e-20_wp
	482	REAL(wp) :: zerr
[9019]	483	REAL(wp), DIMENSION(jpi,jpj) :: zfrz
	484	REAL(wp), DIMENSION(jpi,jpj) :: zgammat, zgammas
	485	REAL(wp), DIMENSION(jpi,jpj) :: zfwflx, zhtflx, zhtflx_b
[4666]	486	!!---------------------------------------------------------------------
[9124]	487	!
[6140]	488	! coeficient for linearisation of potential tfreez
	489	! Crude approximation for pressure (but commonly used)
	490	zlamb1 =-0.0573_wp
	491	zlamb2 = 0.0832_wp
	492	zlamb3 =-7.53e-08_wp * grav * rau0
[4666]	493	!
[6140]	494	! initialisation
	495	zgammat(:,:) = rn_gammat0 ; zgammas (:,:) = rn_gammas0
	496	zhtflx (:,:) = 0.0_wp ; zhtflx_b(:,:) = 0.0_wp
	497	zfwflx (:,:) = 0.0_wp
[4666]	498
[6140]	499	! compute ice shelf melting
	500	nit = 1 ; lit = .TRUE.
	501	DO WHILE ( lit ) ! maybe just a constant number of iteration as in blk_core is fine
	502	SELECT CASE ( nn_isfblk )
	503	CASE ( 1 ) ! ISOMIP formulation (2 equations) for volume flux (Hunter et al., 2006)
	504	! Calculate freezing temperature
	505	CALL eos_fzp( stbl(:,:), zfrz(:,:), risfdep(:,:) )
[4666]	506
[6140]	507	! compute gammat every where (2d)
	508	CALL sbc_isf_gammats(zgammat, zgammas, zhtflx, zfwflx)
	509
	510	! compute upward heat flux zhtflx and upward water flux zwflx
	511	DO jj = 1, jpj
	512	DO ji = 1, jpi
	513	zhtflx(ji,jj) = zgammat(ji,jj)rcprau0*(ttbl(ji,jj)-zfrz(ji,jj))
	514	zfwflx(ji,jj) = - zhtflx(ji,jj)/rlfusisf
	515	END DO
	516	END DO
[4666]	517
[6140]	518	! Compute heat flux and upward fresh water flux
	519	qisf (:,:) = - zhtflx(:,:) * (1._wp - tmask(:,:,1)) * ssmask(:,:)
	520	fwfisf(:,:) = zfwflx(:,:) * (1._wp - tmask(:,:,1)) * ssmask(:,:)
[5721]	521
[6140]	522	CASE ( 2 ) ! ISOMIP+ formulation (3 equations) for volume flux (Asay-Davis et al., 2015)
	523	! compute gammat every where (2d)
	524	CALL sbc_isf_gammats(zgammat, zgammas, zhtflx, zfwflx)
[4666]	525
[6140]	526	! compute upward heat flux zhtflx and upward water flux zwflx
	527	! Resolution of a 2d equation from equation 21, 22 and 23 to find Sb (Asay-Davis et al., 2015)
	528	DO jj = 1, jpj
	529	DO ji = 1, jpi
	530	! compute coeficient to solve the 2nd order equation
	531	zeps1 = rcprau0zgammat(ji,jj)
	532	zeps2 = rlfusisfrau0zgammas(ji,jj)
	533	zeps3 = rhoisfrcpirkappa/MAX(risfdep(ji,jj),zeps)
	534	zeps4 = zlamb2+zlamb3*risfdep(ji,jj)
	535	zeps6 = zeps4-ttbl(ji,jj)
	536	zeps7 = zeps4-tsurf
	537	zaqe = zlamb1 * (zeps1 + zeps3)
	538	zaqer = 0.5_wp/MIN(zaqe,-zeps)
	539	zbqe = zeps1zeps6+zeps3zeps7-zeps2
	540	zcqe = zeps2*stbl(ji,jj)
	541	zdis = zbqezbqe-4.0_wpzaqe*zcqe
	542
	543	! Presumably zdis can never be negative because gammas is very small compared to gammat
	544	! compute s freeze
	545	zsfrz=(-zbqe-SQRT(zdis))*zaqer
	546	IF ( zsfrz < 0.0_wp ) zsfrz=(-zbqe+SQRT(zdis))*zaqer
	547
	548	! compute t freeze (eq. 22)
	549	zfrz(ji,jj)=zeps4+zlamb1*zsfrz
	550
	551	! zfwflx is upward water flux
	552	! zhtflx is upward heat flux (out of ocean)
	553	! compute the upward water and heat flux (eq. 28 and eq. 29)
	554	zfwflx(ji,jj) = rau0 * zgammas(ji,jj) * (zsfrz-stbl(ji,jj)) / MAX(zsfrz,zeps)
	555	zhtflx(ji,jj) = zgammat(ji,jj) * rau0 * rcp * (ttbl(ji,jj) - zfrz(ji,jj) )
	556	END DO
[4666]	557	END DO
	558
[6140]	559	! compute heat and water flux
	560	qisf (:,:) = - zhtflx(:,:) * (1._wp - tmask(:,:,1)) * ssmask(:,:)
	561	fwfisf(:,:) = zfwflx(:,:) * (1._wp - tmask(:,:,1)) * ssmask(:,:)
[4666]	562
[6140]	563	END SELECT
[4666]	564
[6140]	565	! define if we need to iterate (nn_gammablk 0/1 do not need iteration)
	566	IF ( nn_gammablk < 2 ) THEN ; lit = .FALSE.
	567	ELSE
	568	! check total number of iteration
	569	IF (nit >= 100) THEN ; CALL ctl_stop( 'STOP', 'sbc_isf_hol99 : too many iteration ...' )
	570	ELSE ; nit = nit + 1
	571	END IF
[4666]	572
[6140]	573	! compute error between 2 iterations
	574	! if needed save gammat and compute zhtflx_b for next iteration
	575	zerr = MAXVAL(ABS(zhtflx-zhtflx_b))
	576	IF ( zerr <= 0.01_wp ) THEN ; lit = .FALSE.
	577	ELSE ; zhtflx_b(:,:) = zhtflx(:,:)
	578	END IF
	579	END IF
	580	END DO
[5302]	581	!
[6140]	582	CALL iom_put('isfgammat', zgammat)
	583	CALL iom_put('isfgammas', zgammas)
	584	!
[4666]	585	END SUBROUTINE sbc_isf_cav
	586
[7646]	587
[6140]	588	SUBROUTINE sbc_isf_gammats(pgt, pgs, pqhisf, pqwisf )
[4666]	589	!!----------------------------------------------------------------------
	590	!! ** Purpose : compute the coefficient echange for heat flux
	591	!!
	592	!! ** Method : gamma assume constant or depends of u* and stability
	593	!!
	594	!! ** References : Holland and Jenkins, 1999, JPO, p1787-1800, eq 14
	595	!! Jenkins et al., 2010, JPO, p2298-2312
	596	!!---------------------------------------------------------------------
[9124]	597	REAL(wp), DIMENSION(:,:), INTENT( out) :: pgt , pgs !
	598	REAL(wp), DIMENSION(:,:), INTENT(in ) :: pqhisf, pqwisf !
[6140]	599	!
	600	INTEGER :: ji, jj ! loop index
[9124]	601	INTEGER :: ikt ! local integer
[4666]	602	REAL(wp) :: zdku, zdkv ! U, V shear
	603	REAL(wp) :: zPr, zSc, zRc ! Prandtl, Scmidth and Richardson number
	604	REAL(wp) :: zmob, zmols ! Monin Obukov length, coriolis factor at T point
	605	REAL(wp) :: zbuofdep, zhnu ! Bouyancy length scale, sublayer tickness
	606	REAL(wp) :: zhmax ! limitation of mol
	607	REAL(wp) :: zetastar ! stability parameter
	608	REAL(wp) :: zgmolet, zgmoles, zgturb ! contribution of modelecular sublayer and turbulence
	609	REAL(wp) :: zcoef ! temporary coef
[4946]	610	REAL(wp) :: zdep
[6140]	611	REAL(wp) :: zeps = 1.0e-20_wp
	612	REAL(wp), PARAMETER :: zxsiN = 0.052_wp ! dimensionless constant
	613	REAL(wp), PARAMETER :: znu = 1.95e-6_wp ! kinamatic viscosity of sea water (m2.s-1)
[4946]	614	REAL(wp), DIMENSION(2) :: zts, zab
[9019]	615	REAL(wp), DIMENSION(jpi,jpj) :: zustar ! U, V at T point and friction velocity
[4666]	616	!!---------------------------------------------------------------------
	617	!
[6140]	618	SELECT CASE ( nn_gammablk )
	619	CASE ( 0 ) ! gamma is constant (specified in namelist)
	620	!! ISOMIP formulation (Hunter et al, 2006)
	621	pgt(:,:) = rn_gammat0
	622	pgs(:,:) = rn_gammas0
[4666]	623
[6140]	624	CASE ( 1 ) ! gamma is assume to be proportional to u*
	625	!! Jenkins et al., 2010, JPO, p2298-2312
	626	!! Adopted by Asay-Davis et al. (2015)
[9124]	627	!! compute ustar (eq. 24)
	628	!!gm NB use pCdU here so that it will incorporate local boost of Cd0 and log layer case :
	629	!! zustar(:,:) = SQRT( rCdU_top(:,:) * SQRT(utbl(:,:) * utbl(:,:) + vtbl(:,:) * vtbl(:,:) + r_ke0_top) )
	630	!! or better : compute ustar in zdfdrg and use it here as well as in TKE, GLS and Co
	631	!!
	632	!! ===>>>> GM to be done this chrismas
	633	!!
	634	!!gm end
[9019]	635	zustar(:,:) = SQRT( r_Cdmin_top * (utbl(:,:) * utbl(:,:) + vtbl(:,:) * vtbl(:,:) + r_ke0_top) )
[4666]	636
[6140]	637	!! Compute gammats
	638	pgt(:,:) = zustar(:,:) * rn_gammat0
	639	pgs(:,:) = zustar(:,:) * rn_gammas0
	640
	641	CASE ( 2 ) ! gamma depends of stability of boundary layer
	642	!! Holland and Jenkins, 1999, JPO, p1787-1800, eq 14
	643	!! as MOL depends of flux and flux depends of MOL, best will be iteration (TO DO)
	644	!! compute ustar
[9019]	645	zustar(:,:) = SQRT( r_Cdmin_top * (utbl(:,:) * utbl(:,:) + vtbl(:,:) * vtbl(:,:) + r_ke0_top) )
[4666]	646
[6140]	647	!! compute Pr and Sc number (can be improved)
	648	zPr = 13.8_wp
	649	zSc = 2432.0_wp
[4666]	650
[6140]	651	!! compute gamma mole
	652	zgmolet = 12.5_wp * zPr ** (2.0/3.0) - 6.0_wp
	653	zgmoles = 12.5_wp * zSc ** (2.0/3.0) - 6.0_wp
[4666]	654
[6140]	655	!! compute gamma
[9019]	656	DO ji = 2, jpi
	657	DO jj = 2, jpj
[6140]	658	ikt = mikt(ji,jj)
[4666]	659
[9019]	660	IF( zustar(ji,jj) == 0._wp ) THEN ! only for kt = 1 I think
[6140]	661	pgt = rn_gammat0
	662	pgs = rn_gammas0
	663	ELSE
	664	!! compute Rc number (as done in zdfric.F90)
[9019]	665	!!gm better to do it like in the new zdfric.F90 i.e. avm weighted Ri computation
	666	!!gm moreover, use Max(rn2,0) to take care of static instabilities....
[6140]	667	zcoef = 0.5_wp / e3w_n(ji,jj,ikt)
	668	! ! shear of horizontal velocity
	669	zdku = zcoef * ( un(ji-1,jj ,ikt ) + un(ji,jj,ikt ) &
	670	& -un(ji-1,jj ,ikt+1) - un(ji,jj,ikt+1) )
	671	zdkv = zcoef * ( vn(ji ,jj-1,ikt ) + vn(ji,jj,ikt ) &
	672	& -vn(ji ,jj-1,ikt+1) - vn(ji,jj,ikt+1) )
	673	! ! richardson number (minimum value set to zero)
	674	zRc = rn2(ji,jj,ikt+1) / MAX( zdkuzdku + zdkvzdkv, zeps )
	675
	676	!! compute bouyancy
	677	zts(jp_tem) = ttbl(ji,jj)
	678	zts(jp_sal) = stbl(ji,jj)
	679	zdep = gdepw_n(ji,jj,ikt)
[4946]	680	!
[6140]	681	CALL eos_rab( zts, zdep, zab )
	682	!
	683	!! compute length scale
	684	zbuofdep = grav * ( zab(jp_tem) * pqhisf(ji,jj) - zab(jp_sal) * pqwisf(ji,jj) ) !!!!!!!!!!!!!!!!!!!!!!!!!!!!
[4666]	685
[6140]	686	!! compute Monin Obukov Length
	687	! Maximum boundary layer depth
	688	zhmax = gdept_n(ji,jj,mbkt(ji,jj)) - gdepw_n(ji,jj,mikt(ji,jj)) -0.001_wp
	689	! Compute Monin obukhov length scale at the surface and Ekman depth:
	690	zmob = zustar(ji,jj) ** 3 / (vkarmn * (zbuofdep + zeps))
	691	zmols = SIGN(1._wp, zmob) * MIN(ABS(zmob), zhmax) * tmask(ji,jj,ikt)
[4666]	692
[6140]	693	!! compute eta* (stability parameter)
[7646]	694	zetastar = 1._wp / ( SQRT(1._wp + MAX(zxsiN * zustar(ji,jj) / ( ABS(ff_f(ji,jj)) * zmols * zRc ), 0._wp)))
[4666]	695
[6140]	696	!! compute the sublayer thickness
	697	zhnu = 5 * znu / zustar(ji,jj)
[4666]	698
[6140]	699	!! compute gamma turb
[7646]	700	zgturb = 1._wp / vkarmn * LOG(zustar(ji,jj) * zxsiN * zetastar * zetastar / ( ABS(ff_f(ji,jj)) * zhnu )) &
[6140]	701	& + 1._wp / ( 2 * zxsiN * zetastar ) - 1._wp / vkarmn
	702
	703	!! compute gammats
	704	pgt(ji,jj) = zustar(ji,jj) / (zgturb + zgmolet)
	705	pgs(ji,jj) = zustar(ji,jj) / (zgturb + zgmoles)
[4666]	706	END IF
[6140]	707	END DO
	708	END DO
[9098]	709	CALL lbc_lnk_multi( pgt, 'T', 1., pgs, 'T', 1.)
[6140]	710	END SELECT
[5836]	711	!
[6140]	712	END SUBROUTINE sbc_isf_gammats
[4666]	713
[9019]	714
[6140]	715	SUBROUTINE sbc_isf_tbl( pvarin, pvarout, cd_ptin )
[4666]	716	!!----------------------------------------------------------------------
	717	!! * SUBROUTINE sbc_isf_tbl *
	718	!!
[6140]	719	!! ** Purpose : compute mean T/S/U/V in the boundary layer at T- point
[4666]	720	!!
	721	!!----------------------------------------------------------------------
[9019]	722	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: pvarin
	723	REAL(wp), DIMENSION(:,:) , INTENT( out) :: pvarout
	724	CHARACTER(len=1), INTENT(in ) :: cd_ptin ! point of variable in/out
[6140]	725	!
[9019]	726	INTEGER :: ji, jj, jk ! loop index
	727	INTEGER :: ikt, ikb ! top and bottom index of the tbl
	728	REAL(wp) :: ze3, zhk
	729	REAL(wp), DIMENSION(jpi,jpj) :: zhisf_tbl ! thickness of the tbl
[6140]	730	!!----------------------------------------------------------------------
[4666]	731
[6140]	732	! initialisation
	733	pvarout(:,:)=0._wp
	734
	735	SELECT CASE ( cd_ptin )
	736	CASE ( 'U' ) ! compute U in the top boundary layer at T- point
	737	DO jj = 1,jpj
	738	DO ji = 1,jpi
	739	ikt = miku(ji,jj) ; ikb = miku(ji,jj)
	740	! thickness of boundary layer at least the top level thickness
[9019]	741	zhisf_tbl(ji,jj) = MAX( rhisf_tbl_0(ji,jj) , e3u_n(ji,jj,ikt) )
[4666]	742
[6140]	743	! determine the deepest level influenced by the boundary layer
	744	DO jk = ikt+1, mbku(ji,jj)
	745	IF ( (SUM(e3u_n(ji,jj,ikt:jk-1)) < zhisf_tbl(ji,jj)) .AND. (umask(ji,jj,jk) == 1) ) ikb = jk
	746	END DO
	747	zhisf_tbl(ji,jj) = MIN(zhisf_tbl(ji,jj), SUM(e3u_n(ji,jj,ikt:ikb))) ! limit the tbl to water thickness.
[4666]	748
[6140]	749	! level fully include in the ice shelf boundary layer
	750	DO jk = ikt, ikb - 1
	751	ze3 = e3u_n(ji,jj,jk)
	752	pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,jk) / zhisf_tbl(ji,jj) * ze3
	753	END DO
[4666]	754
[6140]	755	! level partially include in ice shelf boundary layer
	756	zhk = SUM( e3u_n(ji, jj, ikt:ikb - 1)) / zhisf_tbl(ji,jj)
	757	pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,ikb) * (1._wp - zhk)
	758	END DO
	759	END DO
[9019]	760	DO jj = 2, jpj
	761	DO ji = 2, jpi
	762	!!gm a wet-point only average should be used here !!!
[6140]	763	pvarout(ji,jj) = 0.5_wp * (pvarout(ji,jj) + pvarout(ji-1,jj))
	764	END DO
	765	END DO
	766	CALL lbc_lnk(pvarout,'T',-1.)
	767
	768	CASE ( 'V' ) ! compute V in the top boundary layer at T- point
	769	DO jj = 1,jpj
	770	DO ji = 1,jpi
	771	ikt = mikv(ji,jj) ; ikb = mikv(ji,jj)
	772	! thickness of boundary layer at least the top level thickness
	773	zhisf_tbl(ji,jj) = MAX(rhisf_tbl_0(ji,jj), e3v_n(ji,jj,ikt))
[4666]	774
[6140]	775	! determine the deepest level influenced by the boundary layer
	776	DO jk = ikt+1, mbkv(ji,jj)
	777	IF ( (SUM(e3v_n(ji,jj,ikt:jk-1)) < zhisf_tbl(ji,jj)) .AND. (vmask(ji,jj,jk) == 1) ) ikb = jk
	778	END DO
	779	zhisf_tbl(ji,jj) = MIN(zhisf_tbl(ji,jj), SUM(e3v_n(ji,jj,ikt:ikb))) ! limit the tbl to water thickness.
[4666]	780
[6140]	781	! level fully include in the ice shelf boundary layer
	782	DO jk = ikt, ikb - 1
	783	ze3 = e3v_n(ji,jj,jk)
	784	pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,jk) / zhisf_tbl(ji,jj) * ze3
	785	END DO
[4666]	786
[6140]	787	! level partially include in ice shelf boundary layer
	788	zhk = SUM( e3v_n(ji, jj, ikt:ikb - 1)) / zhisf_tbl(ji,jj)
	789	pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,ikb) * (1._wp - zhk)
	790	END DO
	791	END DO
[9019]	792	DO jj = 2, jpj
	793	DO ji = 2, jpi
	794	!!gm a wet-point only average should be used here !!!
[6140]	795	pvarout(ji,jj) = 0.5_wp * (pvarout(ji,jj) + pvarout(ji,jj-1))
	796	END DO
	797	END DO
	798	CALL lbc_lnk(pvarout,'T',-1.)
	799
	800	CASE ( 'T' ) ! compute T in the top boundary layer at T- point
	801	DO jj = 1,jpj
	802	DO ji = 1,jpi
	803	ikt = misfkt(ji,jj)
	804	ikb = misfkb(ji,jj)
	805
[4666]	806	! level fully include in the ice shelf boundary layer
	807	DO jk = ikt, ikb - 1
[6140]	808	ze3 = e3t_n(ji,jj,jk)
	809	pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,jk) * r1_hisf_tbl(ji,jj) * ze3
[4666]	810	END DO
	811
	812	! level partially include in ice shelf boundary layer
[6140]	813	zhk = SUM( e3t_n(ji, jj, ikt:ikb - 1)) * r1_hisf_tbl(ji,jj)
	814	pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,ikb) * (1._wp - zhk)
	815	END DO
[4666]	816	END DO
[6140]	817	END SELECT
[9019]	818	!
[6140]	819	! mask mean tbl value
	820	pvarout(:,:) = pvarout(:,:) * ssmask(:,:)
[5836]	821	!
[4666]	822	END SUBROUTINE sbc_isf_tbl
	823
	824
	825	SUBROUTINE sbc_isf_div( phdivn )
	826	!!----------------------------------------------------------------------
	827	!! * SUBROUTINE sbc_isf_div *
	828	!!
	829	!! ** Purpose : update the horizontal divergence with the runoff inflow
	830	!!
	831	!! ** Method :
	832	!! CAUTION : risf_tsc(:,:,jp_sal) is negative (outflow) increase the
	833	!! divergence and expressed in m/s
	834	!!
	835	!! ** Action : phdivn decreased by the runoff inflow
	836	!!----------------------------------------------------------------------
[6140]	837	REAL(wp), DIMENSION(:,:,:), INTENT( inout ) :: phdivn ! horizontal divergence
	838	!
[4946]	839	INTEGER :: ji, jj, jk ! dummy loop indices
	840	INTEGER :: ikt, ikb
[6140]	841	REAL(wp) :: zhk
	842	REAL(wp) :: zfact ! local scalar
[4666]	843	!!----------------------------------------------------------------------
	844	!
	845	zfact = 0.5_wp
	846	!
[6140]	847	IF(.NOT.ln_linssh ) THEN ! need to re compute level distribution of isf fresh water
[4666]	848	DO jj = 1,jpj
	849	DO ji = 1,jpi
	850	ikt = misfkt(ji,jj)
	851	ikb = misfkt(ji,jj)
	852	! thickness of boundary layer at least the top level thickness
[6140]	853	rhisf_tbl(ji,jj) = MAX(rhisf_tbl_0(ji,jj), e3t_n(ji,jj,ikt))
[4666]	854
	855	! determine the deepest level influenced by the boundary layer
	856	DO jk = ikt, mbkt(ji,jj)
[6140]	857	IF ( (SUM(e3t_n(ji,jj,ikt:jk-1)) .LT. rhisf_tbl(ji,jj)) .AND. (tmask(ji,jj,jk) == 1) ) ikb = jk
[4666]	858	END DO
[6140]	859	rhisf_tbl(ji,jj) = MIN(rhisf_tbl(ji,jj), SUM(e3t_n(ji,jj,ikt:ikb))) ! limit the tbl to water thickness.
[4666]	860	misfkb(ji,jj) = ikb ! last wet level of the tbl
	861	r1_hisf_tbl(ji,jj) = 1._wp / rhisf_tbl(ji,jj)
[4726]	862
[6140]	863	zhk = SUM( e3t_n(ji, jj, ikt:ikb - 1)) * r1_hisf_tbl(ji,jj) ! proportion of tbl cover by cell from ikt to ikb - 1
	864	ralpha(ji,jj) = rhisf_tbl(ji,jj) * (1._wp - zhk ) / e3t_n(ji,jj,ikb) ! proportion of bottom cell influenced by boundary layer
[4666]	865	END DO
	866	END DO
[6140]	867	END IF
[4666]	868	!
[6140]	869	!== ice shelf melting distributed over several levels ==!
[4666]	870	DO jj = 1,jpj
	871	DO ji = 1,jpi
	872	ikt = misfkt(ji,jj)
	873	ikb = misfkb(ji,jj)
	874	! level fully include in the ice shelf boundary layer
	875	DO jk = ikt, ikb - 1
[4946]	876	phdivn(ji,jj,jk) = phdivn(ji,jj,jk) + ( fwfisf(ji,jj) + fwfisf_b(ji,jj) ) &
[6140]	877	& * r1_hisf_tbl(ji,jj) * r1_rau0 * zfact
[4666]	878	END DO
	879	! level partially include in ice shelf boundary layer
[4946]	880	phdivn(ji,jj,ikb) = phdivn(ji,jj,ikb) + ( fwfisf(ji,jj) &
[6140]	881	& + fwfisf_b(ji,jj) ) * r1_hisf_tbl(ji,jj) * r1_rau0 * zfact * ralpha(ji,jj)
[4666]	882	END DO
	883	END DO
	884	!
	885	END SUBROUTINE sbc_isf_div
[9019]	886
[6140]	887	!!======================================================================
[4666]	888	END MODULE sbcisf

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