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sbcisf.F90 @ 9580

Last change on this file since 9580 was 9570, checked in by nicolasmartin, 6 years ago

Global renaming for core routines (./NEMO)

Folders
- LIM_SRC_3 -> ICE_SRC
- OPA_SRC -> OCE_SRC
CPP key: key_lim3 -> key_si3
Modules, (sub)routines and variables names
- MPI: mpi_comm_opa -> mpi_comm_oce, MPI_COMM_OPA -> MPI_COMM_OCE, mpi_init_opa -> mpi_init_oce
- AGRIF: agrif_opa_* -> agrif_oce_*, agrif_lim3_* -> agrif_si3_* and few more
- TOP-PISCES: p.zlim -> p.zice, namp.zlim -> namp.zice
Comments
- NEMO/OPA -> NEMO/OCE
- ESIM|LIM3 -> SI3

Property svn:keywords set to Id

File size: 45.1 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	!!----------------------------------------------------------------------
[9570]	71	!! NEMO/OCE 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'
[9367]	209	CALL iom_get( numror, jpdom_autoglo, 'fwf_isf_b', fwfisf_b(:,:) , ldxios = lrxios ) ! before salt content isf_tsc trend
	210	CALL iom_get( numror, jpdom_autoglo, 'isf_sc_b' , risf_tsc_b(:,:,jp_sal), ldxios = lrxios ) ! before salt content isf_tsc trend
	211	CALL iom_get( numror, jpdom_autoglo, 'isf_hc_b' , risf_tsc_b(:,:,jp_tem), ldxios = lrxios ) ! before salt content isf_tsc trend
[9019]	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,*) '~~~~'
[9367]	223	IF( lwxios ) CALL iom_swap( cwxios_context )
	224	CALL iom_rstput( kt, nitrst, numrow, 'fwf_isf_b', fwfisf(:,:) , ldxios = lwxios )
	225	CALL iom_rstput( kt, nitrst, numrow, 'isf_hc_b' , risf_tsc(:,:,jp_tem), ldxios = lwxios )
	226	CALL iom_rstput( kt, nitrst, numrow, 'isf_sc_b' , risf_tsc(:,:,jp_sal), ldxios = lwxios )
	227	IF( lwxios ) CALL iom_swap( cxios_context )
[9019]	228	ENDIF
	229	!
	230	END SUBROUTINE sbc_isf
[5836]	231
[9019]	232
	233	INTEGER FUNCTION sbc_isf_alloc()
[4666]	234	!!----------------------------------------------------------------------
	235	!! * FUNCTION sbc_isf_rnf_alloc *
	236	!!----------------------------------------------------------------------
	237	sbc_isf_alloc = 0 ! set to zero if no array to be allocated
	238	IF( .NOT. ALLOCATED( qisf ) ) THEN
[5120]	239	ALLOCATE( risf_tsc(jpi,jpj,jpts), risf_tsc_b(jpi,jpj,jpts), qisf(jpi,jpj) , &
	240	& rhisf_tbl(jpi,jpj) , r1_hisf_tbl(jpi,jpj), rzisf_tbl(jpi,jpj) , &
	241	& ttbl(jpi,jpj) , stbl(jpi,jpj) , utbl(jpi,jpj) , &
	242	& vtbl(jpi, jpj) , risfLeff(jpi,jpj) , rhisf_tbl_0(jpi,jpj), &
	243	& ralpha(jpi,jpj) , misfkt(jpi,jpj) , misfkb(jpi,jpj) , &
[4946]	244	& STAT= sbc_isf_alloc )
[4666]	245	!
[6140]	246	IF( lk_mpp ) CALL mpp_sum ( sbc_isf_alloc )
[4666]	247	IF( sbc_isf_alloc /= 0 ) CALL ctl_warn('sbc_isf_alloc: failed to allocate arrays.')
	248	!
[9019]	249	ENDIF
	250	END FUNCTION
[4666]	251
[9019]	252
[6140]	253	SUBROUTINE sbc_isf_init
	254	!!---------------------------------------------------------------------
	255	!! * ROUTINE sbc_isf_init *
	256	!!
	257	!! ** Purpose : Initialisation of variables for iceshelf fluxes formulation
	258	!!
	259	!! ** Method : 4 parameterizations are available according to nn_isf
	260	!! nn_isf = 1 : Realistic ice_shelf formulation
	261	!! 2 : Beckmann & Goose parameterization
	262	!! 3 : Specified runoff in deptht (Mathiot & al. )
	263	!! 4 : specified fwf and heat flux forcing beneath the ice shelf
[5836]	264	!!----------------------------------------------------------------------
[6140]	265	INTEGER :: ji, jj, jk ! loop index
	266	INTEGER :: ik ! current level index
	267	INTEGER :: ikt, ikb ! top and bottom level of the isf boundary layer
	268	INTEGER :: inum, ierror
	269	INTEGER :: ios ! Local integer output status for namelist read
	270	REAL(wp) :: zhk
	271	CHARACTER(len=256) :: cvarzisf, cvarhisf ! name for isf file
	272	CHARACTER(LEN=32 ) :: cvarLeff ! variable name for efficient Length scale
[5836]	273	!!----------------------------------------------------------------------
[6140]	274	NAMELIST/namsbc_isf/ nn_isfblk, rn_hisf_tbl, rn_gammat0, rn_gammas0, nn_gammablk, nn_isf, &
	275	& sn_fwfisf, sn_rnfisf, sn_depmax_isf, sn_depmin_isf, sn_Leff_isf
	276	!!----------------------------------------------------------------------
	277
	278	REWIND( numnam_ref ) ! Namelist namsbc_rnf in reference namelist : Runoffs
	279	READ ( numnam_ref, namsbc_isf, IOSTAT = ios, ERR = 901)
[9168]	280	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_isf in reference namelist', lwp )
[6140]	281
	282	REWIND( numnam_cfg ) ! Namelist namsbc_rnf in configuration namelist : Runoffs
	283	READ ( numnam_cfg, namsbc_isf, IOSTAT = ios, ERR = 902 )
[9168]	284	902 IF( ios > 0 ) CALL ctl_nam ( ios , 'namsbc_isf in configuration namelist', lwp )
[6140]	285	IF(lwm) WRITE ( numond, namsbc_isf )
	286
[9168]	287	IF(lwp) WRITE(numout,*)
	288	IF(lwp) WRITE(numout,*) 'sbc_isf_init : heat flux of the ice shelf'
	289	IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~'
	290	IF(lwp) WRITE(numout,*) ' Namelist namsbc_isf :'
	291	IF(lwp) WRITE(numout,*) ' type ice shelf melting/freezing nn_isf = ', nn_isf
	292	IF(lwp) WRITE(numout,*) ' bulk formulation (nn_isf=1 only) nn_isfblk = ', nn_isfblk
	293	IF(lwp) WRITE(numout,*) ' thickness of the top boundary layer rn_hisf_tbl = ', rn_hisf_tbl
	294	IF(lwp) WRITE(numout,*) ' gamma formulation nn_gammablk = ', nn_gammablk
	295	IF(lwp) WRITE(numout,*) ' gammat coefficient rn_gammat0 = ', rn_gammat0
	296	IF(lwp) WRITE(numout,*) ' gammas coefficient rn_gammas0 = ', rn_gammas0
	297	IF(lwp) WRITE(numout,*) ' top drag coef. used (from namdrg_top) rn_Cd0 = ', r_Cdmin_top
	298
	299
	300	! 1 = presence of ISF 2 = bg03 parametrisation
	301	! 3 = rnf file for isf 4 = ISF fwf specified
	302	! option 1 and 4 need ln_isfcav = .true. (domzgr)
[6140]	303	!
	304	! Allocate public variable
	305	IF ( sbc_isf_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'sbc_isf : unable to allocate arrays' )
	306	!
	307	! initialisation
[9019]	308	qisf (:,:) = 0._wp ; fwfisf (:,:) = 0._wp
	309	risf_tsc(:,:,:) = 0._wp ; fwfisf_b(:,:) = 0._wp
[6140]	310	!
	311	! define isf tbl tickness, top and bottom indice
	312	SELECT CASE ( nn_isf )
	313	CASE ( 1 )
[9168]	314	IF(lwp) WRITE(numout,*)
	315	IF(lwp) WRITE(numout,*) ' ==>>> presence of under iceshelf seas (nn_isf = 1)'
[6140]	316	rhisf_tbl(:,:) = rn_hisf_tbl
[9019]	317	misfkt (:,:) = mikt(:,:) ! same indice for bg03 et cav => used in isfdiv
[9168]	318	!
[6140]	319	CASE ( 2 , 3 )
[7788]	320	IF( .NOT.l_isfcpl ) THEN
	321	ALLOCATE( sf_rnfisf(1), STAT=ierror )
	322	ALLOCATE( sf_rnfisf(1)%fnow(jpi,jpj,1), sf_rnfisf(1)%fdta(jpi,jpj,1,2) )
	323	CALL fld_fill( sf_rnfisf, (/ sn_rnfisf /), cn_dirisf, 'sbc_isf_init', 'read fresh water flux isf data', 'namsbc_isf' )
	324	ENDIF
	325	! read effective lenght (BG03)
[9168]	326	IF( nn_isf == 2 ) THEN
	327	IF(lwp) WRITE(numout,*)
	328	IF(lwp) WRITE(numout,*) ' ==>>> bg03 parametrisation (nn_isf = 2)'
[6140]	329	CALL iom_open( sn_Leff_isf%clname, inum )
	330	cvarLeff = TRIM(sn_Leff_isf%clvar)
	331	CALL iom_get( inum, jpdom_data, cvarLeff, risfLeff , 1)
	332	CALL iom_close(inum)
	333	!
	334	risfLeff = risfLeff*1000.0_wp !: convertion in m
[9168]	335	ELSE
	336	IF(lwp) WRITE(numout,*)
	337	IF(lwp) WRITE(numout,*) ' ==>>> rnf file for isf (nn_isf = 3)'
	338	ENDIF
[6140]	339	! read depth of the top and bottom of the isf top boundary layer (in this case, isf front depth and grounding line depth)
	340	CALL iom_open( sn_depmax_isf%clname, inum )
	341	cvarhisf = TRIM(sn_depmax_isf%clvar)
	342	CALL iom_get( inum, jpdom_data, cvarhisf, rhisf_tbl, 1) !: depth of deepest point of the ice shelf base
	343	CALL iom_close(inum)
	344	!
	345	CALL iom_open( sn_depmin_isf%clname, inum )
	346	cvarzisf = TRIM(sn_depmin_isf%clvar)
	347	CALL iom_get( inum, jpdom_data, cvarzisf, rzisf_tbl, 1) !: depth of shallowest point of the ice shelves base
	348	CALL iom_close(inum)
	349	!
	350	rhisf_tbl(:,:) = rhisf_tbl(:,:) - rzisf_tbl(:,:) !: tickness isf boundary layer
	351
	352	!! compute first level of the top boundary layer
	353	DO ji = 1, jpi
	354	DO jj = 1, jpj
	355	ik = 2
[9019]	356	!!gm potential bug: use gdepw_0 not _n
[6140]	357	DO WHILE ( ik <= mbkt(ji,jj) .AND. gdepw_n(ji,jj,ik) < rzisf_tbl(ji,jj) ) ; ik = ik + 1 ; END DO
	358	misfkt(ji,jj) = ik-1
	359	END DO
	360	END DO
[9168]	361	!
[6140]	362	CASE ( 4 )
[9168]	363	IF(lwp) WRITE(numout,*)
	364	IF(lwp) WRITE(numout,*) ' ==>>> specified fresh water flux in ISF (nn_isf = 4)'
[6140]	365	! as in nn_isf == 1
	366	rhisf_tbl(:,:) = rn_hisf_tbl
[9019]	367	misfkt (:,:) = mikt(:,:) ! same indice for bg03 et cav => used in isfdiv
[9168]	368	!
[6140]	369	! load variable used in fldread (use for temporal interpolation of isf fwf forcing)
[7788]	370	IF( .NOT.l_isfcpl ) THEN
	371	ALLOCATE( sf_fwfisf(1), STAT=ierror )
	372	ALLOCATE( sf_fwfisf(1)%fnow(jpi,jpj,1), sf_fwfisf(1)%fdta(jpi,jpj,1,2) )
	373	CALL fld_fill( sf_fwfisf, (/ sn_fwfisf /), cn_dirisf, 'sbc_isf_init', 'read fresh water flux isf data', 'namsbc_isf' )
	374	ENDIF
[9168]	375	!
	376	CASE DEFAULT
	377	CALL ctl_stop( 'sbc_isf_init: wrong value of nn_isf' )
[6140]	378	END SELECT
	379
	380	rhisf_tbl_0(:,:) = rhisf_tbl(:,:)
	381
	382	! compute bottom level of isf tbl and thickness of tbl below the ice shelf
	383	DO jj = 1,jpj
	384	DO ji = 1,jpi
	385	ikt = misfkt(ji,jj)
	386	ikb = misfkt(ji,jj)
	387	! thickness of boundary layer at least the top level thickness
	388	rhisf_tbl(ji,jj) = MAX(rhisf_tbl_0(ji,jj), e3t_n(ji,jj,ikt))
	389
	390	! determine the deepest level influenced by the boundary layer
	391	DO jk = ikt+1, mbkt(ji,jj)
[9019]	392	IF( (SUM(e3t_n(ji,jj,ikt:jk-1)) < rhisf_tbl(ji,jj)) .AND. (tmask(ji,jj,jk) == 1) ) ikb = jk
[6140]	393	END DO
	394	rhisf_tbl(ji,jj) = MIN(rhisf_tbl(ji,jj), SUM(e3t_n(ji,jj,ikt:ikb))) ! limit the tbl to water thickness.
	395	misfkb(ji,jj) = ikb ! last wet level of the tbl
	396	r1_hisf_tbl(ji,jj) = 1._wp / rhisf_tbl(ji,jj)
	397
	398	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
	399	ralpha(ji,jj) = rhisf_tbl(ji,jj) * (1._wp - zhk ) / e3t_n(ji,jj,ikb) ! proportion of bottom cell influenced by boundary layer
	400	END DO
	401	END DO
	402
[9367]	403	IF( lwxios ) THEN
	404	CALL iom_set_rstw_var_active('fwf_isf_b')
	405	CALL iom_set_rstw_var_active('isf_hc_b')
	406	CALL iom_set_rstw_var_active('isf_sc_b')
	407	ENDIF
	408
	409
[6140]	410	END SUBROUTINE sbc_isf_init
	411
[9019]	412
[6140]	413	SUBROUTINE sbc_isf_bg03(kt)
	414	!!---------------------------------------------------------------------
	415	!! * ROUTINE sbc_isf_bg03 *
[5836]	416	!!
[6140]	417	!! ** Purpose : add net heat and fresh water flux from ice shelf melting
	418	!! into the adjacent ocean
[5836]	419	!!
[6140]	420	!! ** Method : See reference
	421	!!
	422	!! ** Reference : Beckmann and Goosse (2003), "A parameterization of ice shelf-ocean
	423	!! interaction for climate models", Ocean Modelling 5(2003) 157-170.
	424	!! (hereafter BG)
[9019]	425	!! History : 06-02 (C. Wang) Original code
[5836]	426	!!----------------------------------------------------------------------
	427	INTEGER, INTENT ( in ) :: kt
	428	!
[6140]	429	INTEGER :: ji, jj, jk ! dummy loop index
	430	INTEGER :: ik ! current level
	431	REAL(wp) :: zt_sum ! sum of the temperature between 200m and 600m
	432	REAL(wp) :: zt_ave ! averaged temperature between 200m and 600m
	433	REAL(wp) :: zt_frz ! freezing point temperature at depth z
	434	REAL(wp) :: zpress ! pressure to compute the freezing point in depth
	435	!!----------------------------------------------------------------------
	436	!
	437	DO ji = 1, jpi
	438	DO jj = 1, jpj
	439	ik = misfkt(ji,jj)
	440	!! Initialize arrays to 0 (each step)
	441	zt_sum = 0.e0_wp
	442	IF ( ik > 1 ) THEN
	443	! 1. -----------the average temperature between 200m and 600m ---------------------
	444	DO jk = misfkt(ji,jj),misfkb(ji,jj)
	445	! freezing point temperature at ice shelf base BG eq. 2 (JMM sign pb ??? +7.64e-4 !!!)
	446	! after verif with UNESCO, wrong sign in BG eq. 2
	447	! Calculate freezing temperature
	448	CALL eos_fzp(stbl(ji,jj), zt_frz, zpress)
	449	zt_sum = zt_sum + (tsn(ji,jj,jk,jp_tem)-zt_frz) * e3t_n(ji,jj,jk) * tmask(ji,jj,jk) ! sum temp
	450	END DO
	451	zt_ave = zt_sum/rhisf_tbl(ji,jj) ! calcul mean value
	452	! 2. ------------Net heat flux and fresh water flux due to the ice shelf
	453	! For those corresponding to zonal boundary
	454	qisf(ji,jj) = - rau0 * rcp * rn_gammat0 * risfLeff(ji,jj) * e1t(ji,jj) * zt_ave &
	455	& * r1_e1e2t(ji,jj) * tmask(ji,jj,jk)
[4666]	456
[6140]	457	fwfisf(ji,jj) = qisf(ji,jj) / rlfusisf !fresh water flux kg/(m2s)
	458	fwfisf(ji,jj) = fwfisf(ji,jj) * ( soce / stbl(ji,jj) )
	459	!add to salinity trend
	460	ELSE
[9019]	461	qisf(ji,jj) = 0._wp ; fwfisf(ji,jj) = 0._wp
[6140]	462	END IF
	463	END DO
	464	END DO
[5836]	465	!
[4666]	466	END SUBROUTINE sbc_isf_bg03
	467
[9019]	468
[6140]	469	SUBROUTINE sbc_isf_cav( kt )
[4666]	470	!!---------------------------------------------------------------------
	471	!! * ROUTINE sbc_isf_cav *
	472	!!
	473	!! ** Purpose : handle surface boundary condition under ice shelf
	474	!!
	475	!! ** Method : -
	476	!!
	477	!! ** Action : utau, vtau : remain unchanged
	478	!! taum, wndm : remain unchanged
	479	!! qns : update heat flux below ice shelf
	480	!! emp, emps : update freshwater flux below ice shelf
	481	!!---------------------------------------------------------------------
[9019]	482	INTEGER, INTENT(in) :: kt ! ocean time step
[4666]	483	!
[6140]	484	INTEGER :: ji, jj ! dummy loop indices
	485	INTEGER :: nit
[9019]	486	LOGICAL :: lit
[4666]	487	REAL(wp) :: zlamb1, zlamb2, zlamb3
	488	REAL(wp) :: zeps1,zeps2,zeps3,zeps4,zeps6,zeps7
	489	REAL(wp) :: zaqe,zbqe,zcqe,zaqer,zdis,zsfrz,zcfac
[6140]	490	REAL(wp) :: zeps = 1.e-20_wp
	491	REAL(wp) :: zerr
[9019]	492	REAL(wp), DIMENSION(jpi,jpj) :: zfrz
	493	REAL(wp), DIMENSION(jpi,jpj) :: zgammat, zgammas
	494	REAL(wp), DIMENSION(jpi,jpj) :: zfwflx, zhtflx, zhtflx_b
[4666]	495	!!---------------------------------------------------------------------
[9124]	496	!
[6140]	497	! coeficient for linearisation of potential tfreez
	498	! Crude approximation for pressure (but commonly used)
	499	zlamb1 =-0.0573_wp
	500	zlamb2 = 0.0832_wp
	501	zlamb3 =-7.53e-08_wp * grav * rau0
[4666]	502	!
[6140]	503	! initialisation
	504	zgammat(:,:) = rn_gammat0 ; zgammas (:,:) = rn_gammas0
	505	zhtflx (:,:) = 0.0_wp ; zhtflx_b(:,:) = 0.0_wp
	506	zfwflx (:,:) = 0.0_wp
[4666]	507
[6140]	508	! compute ice shelf melting
	509	nit = 1 ; lit = .TRUE.
	510	DO WHILE ( lit ) ! maybe just a constant number of iteration as in blk_core is fine
	511	SELECT CASE ( nn_isfblk )
	512	CASE ( 1 ) ! ISOMIP formulation (2 equations) for volume flux (Hunter et al., 2006)
	513	! Calculate freezing temperature
	514	CALL eos_fzp( stbl(:,:), zfrz(:,:), risfdep(:,:) )
[4666]	515
[6140]	516	! compute gammat every where (2d)
	517	CALL sbc_isf_gammats(zgammat, zgammas, zhtflx, zfwflx)
	518
	519	! compute upward heat flux zhtflx and upward water flux zwflx
	520	DO jj = 1, jpj
	521	DO ji = 1, jpi
	522	zhtflx(ji,jj) = zgammat(ji,jj)rcprau0*(ttbl(ji,jj)-zfrz(ji,jj))
	523	zfwflx(ji,jj) = - zhtflx(ji,jj)/rlfusisf
	524	END DO
	525	END DO
[4666]	526
[6140]	527	! Compute heat flux and upward fresh water flux
	528	qisf (:,:) = - zhtflx(:,:) * (1._wp - tmask(:,:,1)) * ssmask(:,:)
	529	fwfisf(:,:) = zfwflx(:,:) * (1._wp - tmask(:,:,1)) * ssmask(:,:)
[5721]	530
[6140]	531	CASE ( 2 ) ! ISOMIP+ formulation (3 equations) for volume flux (Asay-Davis et al., 2015)
	532	! compute gammat every where (2d)
	533	CALL sbc_isf_gammats(zgammat, zgammas, zhtflx, zfwflx)
[4666]	534
[6140]	535	! compute upward heat flux zhtflx and upward water flux zwflx
	536	! Resolution of a 2d equation from equation 21, 22 and 23 to find Sb (Asay-Davis et al., 2015)
	537	DO jj = 1, jpj
	538	DO ji = 1, jpi
	539	! compute coeficient to solve the 2nd order equation
	540	zeps1 = rcprau0zgammat(ji,jj)
	541	zeps2 = rlfusisfrau0zgammas(ji,jj)
	542	zeps3 = rhoisfrcpirkappa/MAX(risfdep(ji,jj),zeps)
	543	zeps4 = zlamb2+zlamb3*risfdep(ji,jj)
	544	zeps6 = zeps4-ttbl(ji,jj)
	545	zeps7 = zeps4-tsurf
	546	zaqe = zlamb1 * (zeps1 + zeps3)
	547	zaqer = 0.5_wp/MIN(zaqe,-zeps)
	548	zbqe = zeps1zeps6+zeps3zeps7-zeps2
	549	zcqe = zeps2*stbl(ji,jj)
	550	zdis = zbqezbqe-4.0_wpzaqe*zcqe
	551
	552	! Presumably zdis can never be negative because gammas is very small compared to gammat
	553	! compute s freeze
	554	zsfrz=(-zbqe-SQRT(zdis))*zaqer
	555	IF ( zsfrz < 0.0_wp ) zsfrz=(-zbqe+SQRT(zdis))*zaqer
	556
	557	! compute t freeze (eq. 22)
	558	zfrz(ji,jj)=zeps4+zlamb1*zsfrz
	559
	560	! zfwflx is upward water flux
	561	! zhtflx is upward heat flux (out of ocean)
	562	! compute the upward water and heat flux (eq. 28 and eq. 29)
	563	zfwflx(ji,jj) = rau0 * zgammas(ji,jj) * (zsfrz-stbl(ji,jj)) / MAX(zsfrz,zeps)
	564	zhtflx(ji,jj) = zgammat(ji,jj) * rau0 * rcp * (ttbl(ji,jj) - zfrz(ji,jj) )
	565	END DO
[4666]	566	END DO
	567
[6140]	568	! compute heat and water flux
	569	qisf (:,:) = - zhtflx(:,:) * (1._wp - tmask(:,:,1)) * ssmask(:,:)
	570	fwfisf(:,:) = zfwflx(:,:) * (1._wp - tmask(:,:,1)) * ssmask(:,:)
[4666]	571
[6140]	572	END SELECT
[4666]	573
[6140]	574	! define if we need to iterate (nn_gammablk 0/1 do not need iteration)
	575	IF ( nn_gammablk < 2 ) THEN ; lit = .FALSE.
	576	ELSE
	577	! check total number of iteration
	578	IF (nit >= 100) THEN ; CALL ctl_stop( 'STOP', 'sbc_isf_hol99 : too many iteration ...' )
	579	ELSE ; nit = nit + 1
	580	END IF
[4666]	581
[6140]	582	! compute error between 2 iterations
	583	! if needed save gammat and compute zhtflx_b for next iteration
	584	zerr = MAXVAL(ABS(zhtflx-zhtflx_b))
	585	IF ( zerr <= 0.01_wp ) THEN ; lit = .FALSE.
	586	ELSE ; zhtflx_b(:,:) = zhtflx(:,:)
	587	END IF
	588	END IF
	589	END DO
[5302]	590	!
[6140]	591	CALL iom_put('isfgammat', zgammat)
	592	CALL iom_put('isfgammas', zgammas)
	593	!
[4666]	594	END SUBROUTINE sbc_isf_cav
	595
[7646]	596
[6140]	597	SUBROUTINE sbc_isf_gammats(pgt, pgs, pqhisf, pqwisf )
[4666]	598	!!----------------------------------------------------------------------
	599	!! ** Purpose : compute the coefficient echange for heat flux
	600	!!
	601	!! ** Method : gamma assume constant or depends of u* and stability
	602	!!
	603	!! ** References : Holland and Jenkins, 1999, JPO, p1787-1800, eq 14
	604	!! Jenkins et al., 2010, JPO, p2298-2312
	605	!!---------------------------------------------------------------------
[9124]	606	REAL(wp), DIMENSION(:,:), INTENT( out) :: pgt , pgs !
	607	REAL(wp), DIMENSION(:,:), INTENT(in ) :: pqhisf, pqwisf !
[6140]	608	!
	609	INTEGER :: ji, jj ! loop index
[9124]	610	INTEGER :: ikt ! local integer
[4666]	611	REAL(wp) :: zdku, zdkv ! U, V shear
	612	REAL(wp) :: zPr, zSc, zRc ! Prandtl, Scmidth and Richardson number
	613	REAL(wp) :: zmob, zmols ! Monin Obukov length, coriolis factor at T point
	614	REAL(wp) :: zbuofdep, zhnu ! Bouyancy length scale, sublayer tickness
	615	REAL(wp) :: zhmax ! limitation of mol
	616	REAL(wp) :: zetastar ! stability parameter
	617	REAL(wp) :: zgmolet, zgmoles, zgturb ! contribution of modelecular sublayer and turbulence
	618	REAL(wp) :: zcoef ! temporary coef
[4946]	619	REAL(wp) :: zdep
[6140]	620	REAL(wp) :: zeps = 1.0e-20_wp
	621	REAL(wp), PARAMETER :: zxsiN = 0.052_wp ! dimensionless constant
	622	REAL(wp), PARAMETER :: znu = 1.95e-6_wp ! kinamatic viscosity of sea water (m2.s-1)
[4946]	623	REAL(wp), DIMENSION(2) :: zts, zab
[9019]	624	REAL(wp), DIMENSION(jpi,jpj) :: zustar ! U, V at T point and friction velocity
[4666]	625	!!---------------------------------------------------------------------
	626	!
[6140]	627	SELECT CASE ( nn_gammablk )
	628	CASE ( 0 ) ! gamma is constant (specified in namelist)
	629	!! ISOMIP formulation (Hunter et al, 2006)
	630	pgt(:,:) = rn_gammat0
	631	pgs(:,:) = rn_gammas0
[4666]	632
[6140]	633	CASE ( 1 ) ! gamma is assume to be proportional to u*
	634	!! Jenkins et al., 2010, JPO, p2298-2312
	635	!! Adopted by Asay-Davis et al. (2015)
[9124]	636	!! compute ustar (eq. 24)
	637	!!gm NB use pCdU here so that it will incorporate local boost of Cd0 and log layer case :
	638	!! zustar(:,:) = SQRT( rCdU_top(:,:) * SQRT(utbl(:,:) * utbl(:,:) + vtbl(:,:) * vtbl(:,:) + r_ke0_top) )
	639	!! or better : compute ustar in zdfdrg and use it here as well as in TKE, GLS and Co
	640	!!
	641	!! ===>>>> GM to be done this chrismas
	642	!!
	643	!!gm end
[9019]	644	zustar(:,:) = SQRT( r_Cdmin_top * (utbl(:,:) * utbl(:,:) + vtbl(:,:) * vtbl(:,:) + r_ke0_top) )
[4666]	645
[6140]	646	!! Compute gammats
	647	pgt(:,:) = zustar(:,:) * rn_gammat0
	648	pgs(:,:) = zustar(:,:) * rn_gammas0
	649
	650	CASE ( 2 ) ! gamma depends of stability of boundary layer
	651	!! Holland and Jenkins, 1999, JPO, p1787-1800, eq 14
	652	!! as MOL depends of flux and flux depends of MOL, best will be iteration (TO DO)
	653	!! compute ustar
[9019]	654	zustar(:,:) = SQRT( r_Cdmin_top * (utbl(:,:) * utbl(:,:) + vtbl(:,:) * vtbl(:,:) + r_ke0_top) )
[4666]	655
[6140]	656	!! compute Pr and Sc number (can be improved)
	657	zPr = 13.8_wp
	658	zSc = 2432.0_wp
[4666]	659
[6140]	660	!! compute gamma mole
	661	zgmolet = 12.5_wp * zPr ** (2.0/3.0) - 6.0_wp
	662	zgmoles = 12.5_wp * zSc ** (2.0/3.0) - 6.0_wp
[4666]	663
[6140]	664	!! compute gamma
[9019]	665	DO ji = 2, jpi
	666	DO jj = 2, jpj
[6140]	667	ikt = mikt(ji,jj)
[4666]	668
[9019]	669	IF( zustar(ji,jj) == 0._wp ) THEN ! only for kt = 1 I think
[6140]	670	pgt = rn_gammat0
	671	pgs = rn_gammas0
	672	ELSE
	673	!! compute Rc number (as done in zdfric.F90)
[9019]	674	!!gm better to do it like in the new zdfric.F90 i.e. avm weighted Ri computation
	675	!!gm moreover, use Max(rn2,0) to take care of static instabilities....
[6140]	676	zcoef = 0.5_wp / e3w_n(ji,jj,ikt)
	677	! ! shear of horizontal velocity
	678	zdku = zcoef * ( un(ji-1,jj ,ikt ) + un(ji,jj,ikt ) &
	679	& -un(ji-1,jj ,ikt+1) - un(ji,jj,ikt+1) )
	680	zdkv = zcoef * ( vn(ji ,jj-1,ikt ) + vn(ji,jj,ikt ) &
	681	& -vn(ji ,jj-1,ikt+1) - vn(ji,jj,ikt+1) )
	682	! ! richardson number (minimum value set to zero)
	683	zRc = rn2(ji,jj,ikt+1) / MAX( zdkuzdku + zdkvzdkv, zeps )
	684
	685	!! compute bouyancy
	686	zts(jp_tem) = ttbl(ji,jj)
	687	zts(jp_sal) = stbl(ji,jj)
	688	zdep = gdepw_n(ji,jj,ikt)
[4946]	689	!
[6140]	690	CALL eos_rab( zts, zdep, zab )
	691	!
	692	!! compute length scale
	693	zbuofdep = grav * ( zab(jp_tem) * pqhisf(ji,jj) - zab(jp_sal) * pqwisf(ji,jj) ) !!!!!!!!!!!!!!!!!!!!!!!!!!!!
[4666]	694
[6140]	695	!! compute Monin Obukov Length
	696	! Maximum boundary layer depth
	697	zhmax = gdept_n(ji,jj,mbkt(ji,jj)) - gdepw_n(ji,jj,mikt(ji,jj)) -0.001_wp
	698	! Compute Monin obukhov length scale at the surface and Ekman depth:
	699	zmob = zustar(ji,jj) ** 3 / (vkarmn * (zbuofdep + zeps))
	700	zmols = SIGN(1._wp, zmob) * MIN(ABS(zmob), zhmax) * tmask(ji,jj,ikt)
[4666]	701
[6140]	702	!! compute eta* (stability parameter)
[7646]	703	zetastar = 1._wp / ( SQRT(1._wp + MAX(zxsiN * zustar(ji,jj) / ( ABS(ff_f(ji,jj)) * zmols * zRc ), 0._wp)))
[4666]	704
[6140]	705	!! compute the sublayer thickness
	706	zhnu = 5 * znu / zustar(ji,jj)
[4666]	707
[6140]	708	!! compute gamma turb
[7646]	709	zgturb = 1._wp / vkarmn * LOG(zustar(ji,jj) * zxsiN * zetastar * zetastar / ( ABS(ff_f(ji,jj)) * zhnu )) &
[6140]	710	& + 1._wp / ( 2 * zxsiN * zetastar ) - 1._wp / vkarmn
	711
	712	!! compute gammats
	713	pgt(ji,jj) = zustar(ji,jj) / (zgturb + zgmolet)
	714	pgs(ji,jj) = zustar(ji,jj) / (zgturb + zgmoles)
[4666]	715	END IF
[6140]	716	END DO
	717	END DO
[9098]	718	CALL lbc_lnk_multi( pgt, 'T', 1., pgs, 'T', 1.)
[6140]	719	END SELECT
[5836]	720	!
[6140]	721	END SUBROUTINE sbc_isf_gammats
[4666]	722
[9019]	723
[6140]	724	SUBROUTINE sbc_isf_tbl( pvarin, pvarout, cd_ptin )
[4666]	725	!!----------------------------------------------------------------------
	726	!! * SUBROUTINE sbc_isf_tbl *
	727	!!
[6140]	728	!! ** Purpose : compute mean T/S/U/V in the boundary layer at T- point
[4666]	729	!!
	730	!!----------------------------------------------------------------------
[9019]	731	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: pvarin
	732	REAL(wp), DIMENSION(:,:) , INTENT( out) :: pvarout
	733	CHARACTER(len=1), INTENT(in ) :: cd_ptin ! point of variable in/out
[6140]	734	!
[9019]	735	INTEGER :: ji, jj, jk ! loop index
	736	INTEGER :: ikt, ikb ! top and bottom index of the tbl
	737	REAL(wp) :: ze3, zhk
	738	REAL(wp), DIMENSION(jpi,jpj) :: zhisf_tbl ! thickness of the tbl
[6140]	739	!!----------------------------------------------------------------------
[4666]	740
[6140]	741	! initialisation
	742	pvarout(:,:)=0._wp
	743
	744	SELECT CASE ( cd_ptin )
	745	CASE ( 'U' ) ! compute U in the top boundary layer at T- point
	746	DO jj = 1,jpj
	747	DO ji = 1,jpi
	748	ikt = miku(ji,jj) ; ikb = miku(ji,jj)
	749	! thickness of boundary layer at least the top level thickness
[9019]	750	zhisf_tbl(ji,jj) = MAX( rhisf_tbl_0(ji,jj) , e3u_n(ji,jj,ikt) )
[4666]	751
[6140]	752	! determine the deepest level influenced by the boundary layer
	753	DO jk = ikt+1, mbku(ji,jj)
	754	IF ( (SUM(e3u_n(ji,jj,ikt:jk-1)) < zhisf_tbl(ji,jj)) .AND. (umask(ji,jj,jk) == 1) ) ikb = jk
	755	END DO
	756	zhisf_tbl(ji,jj) = MIN(zhisf_tbl(ji,jj), SUM(e3u_n(ji,jj,ikt:ikb))) ! limit the tbl to water thickness.
[4666]	757
[6140]	758	! level fully include in the ice shelf boundary layer
	759	DO jk = ikt, ikb - 1
	760	ze3 = e3u_n(ji,jj,jk)
	761	pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,jk) / zhisf_tbl(ji,jj) * ze3
	762	END DO
[4666]	763
[6140]	764	! level partially include in ice shelf boundary layer
	765	zhk = SUM( e3u_n(ji, jj, ikt:ikb - 1)) / zhisf_tbl(ji,jj)
	766	pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,ikb) * (1._wp - zhk)
	767	END DO
	768	END DO
[9019]	769	DO jj = 2, jpj
	770	DO ji = 2, jpi
	771	!!gm a wet-point only average should be used here !!!
[6140]	772	pvarout(ji,jj) = 0.5_wp * (pvarout(ji,jj) + pvarout(ji-1,jj))
	773	END DO
	774	END DO
	775	CALL lbc_lnk(pvarout,'T',-1.)
	776
	777	CASE ( 'V' ) ! compute V in the top boundary layer at T- point
	778	DO jj = 1,jpj
	779	DO ji = 1,jpi
	780	ikt = mikv(ji,jj) ; ikb = mikv(ji,jj)
	781	! thickness of boundary layer at least the top level thickness
	782	zhisf_tbl(ji,jj) = MAX(rhisf_tbl_0(ji,jj), e3v_n(ji,jj,ikt))
[4666]	783
[6140]	784	! determine the deepest level influenced by the boundary layer
	785	DO jk = ikt+1, mbkv(ji,jj)
	786	IF ( (SUM(e3v_n(ji,jj,ikt:jk-1)) < zhisf_tbl(ji,jj)) .AND. (vmask(ji,jj,jk) == 1) ) ikb = jk
	787	END DO
	788	zhisf_tbl(ji,jj) = MIN(zhisf_tbl(ji,jj), SUM(e3v_n(ji,jj,ikt:ikb))) ! limit the tbl to water thickness.
[4666]	789
[6140]	790	! level fully include in the ice shelf boundary layer
	791	DO jk = ikt, ikb - 1
	792	ze3 = e3v_n(ji,jj,jk)
	793	pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,jk) / zhisf_tbl(ji,jj) * ze3
	794	END DO
[4666]	795
[6140]	796	! level partially include in ice shelf boundary layer
	797	zhk = SUM( e3v_n(ji, jj, ikt:ikb - 1)) / zhisf_tbl(ji,jj)
	798	pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,ikb) * (1._wp - zhk)
	799	END DO
	800	END DO
[9019]	801	DO jj = 2, jpj
	802	DO ji = 2, jpi
	803	!!gm a wet-point only average should be used here !!!
[6140]	804	pvarout(ji,jj) = 0.5_wp * (pvarout(ji,jj) + pvarout(ji,jj-1))
	805	END DO
	806	END DO
	807	CALL lbc_lnk(pvarout,'T',-1.)
	808
	809	CASE ( 'T' ) ! compute T in the top boundary layer at T- point
	810	DO jj = 1,jpj
	811	DO ji = 1,jpi
	812	ikt = misfkt(ji,jj)
	813	ikb = misfkb(ji,jj)
	814
[4666]	815	! level fully include in the ice shelf boundary layer
	816	DO jk = ikt, ikb - 1
[6140]	817	ze3 = e3t_n(ji,jj,jk)
	818	pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,jk) * r1_hisf_tbl(ji,jj) * ze3
[4666]	819	END DO
	820
	821	! level partially include in ice shelf boundary layer
[6140]	822	zhk = SUM( e3t_n(ji, jj, ikt:ikb - 1)) * r1_hisf_tbl(ji,jj)
	823	pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,ikb) * (1._wp - zhk)
	824	END DO
[4666]	825	END DO
[6140]	826	END SELECT
[9019]	827	!
[6140]	828	! mask mean tbl value
	829	pvarout(:,:) = pvarout(:,:) * ssmask(:,:)
[5836]	830	!
[4666]	831	END SUBROUTINE sbc_isf_tbl
	832
	833
	834	SUBROUTINE sbc_isf_div( phdivn )
	835	!!----------------------------------------------------------------------
	836	!! * SUBROUTINE sbc_isf_div *
	837	!!
	838	!! ** Purpose : update the horizontal divergence with the runoff inflow
	839	!!
	840	!! ** Method :
	841	!! CAUTION : risf_tsc(:,:,jp_sal) is negative (outflow) increase the
	842	!! divergence and expressed in m/s
	843	!!
	844	!! ** Action : phdivn decreased by the runoff inflow
	845	!!----------------------------------------------------------------------
[6140]	846	REAL(wp), DIMENSION(:,:,:), INTENT( inout ) :: phdivn ! horizontal divergence
	847	!
[4946]	848	INTEGER :: ji, jj, jk ! dummy loop indices
	849	INTEGER :: ikt, ikb
[6140]	850	REAL(wp) :: zhk
	851	REAL(wp) :: zfact ! local scalar
[4666]	852	!!----------------------------------------------------------------------
	853	!
	854	zfact = 0.5_wp
	855	!
[6140]	856	IF(.NOT.ln_linssh ) THEN ! need to re compute level distribution of isf fresh water
[4666]	857	DO jj = 1,jpj
	858	DO ji = 1,jpi
	859	ikt = misfkt(ji,jj)
	860	ikb = misfkt(ji,jj)
	861	! thickness of boundary layer at least the top level thickness
[6140]	862	rhisf_tbl(ji,jj) = MAX(rhisf_tbl_0(ji,jj), e3t_n(ji,jj,ikt))
[4666]	863
	864	! determine the deepest level influenced by the boundary layer
	865	DO jk = ikt, mbkt(ji,jj)
[6140]	866	IF ( (SUM(e3t_n(ji,jj,ikt:jk-1)) .LT. rhisf_tbl(ji,jj)) .AND. (tmask(ji,jj,jk) == 1) ) ikb = jk
[4666]	867	END DO
[6140]	868	rhisf_tbl(ji,jj) = MIN(rhisf_tbl(ji,jj), SUM(e3t_n(ji,jj,ikt:ikb))) ! limit the tbl to water thickness.
[4666]	869	misfkb(ji,jj) = ikb ! last wet level of the tbl
	870	r1_hisf_tbl(ji,jj) = 1._wp / rhisf_tbl(ji,jj)
[4726]	871
[6140]	872	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
	873	ralpha(ji,jj) = rhisf_tbl(ji,jj) * (1._wp - zhk ) / e3t_n(ji,jj,ikb) ! proportion of bottom cell influenced by boundary layer
[4666]	874	END DO
	875	END DO
[6140]	876	END IF
[4666]	877	!
[6140]	878	!== ice shelf melting distributed over several levels ==!
[4666]	879	DO jj = 1,jpj
	880	DO ji = 1,jpi
	881	ikt = misfkt(ji,jj)
	882	ikb = misfkb(ji,jj)
	883	! level fully include in the ice shelf boundary layer
	884	DO jk = ikt, ikb - 1
[4946]	885	phdivn(ji,jj,jk) = phdivn(ji,jj,jk) + ( fwfisf(ji,jj) + fwfisf_b(ji,jj) ) &
[6140]	886	& * r1_hisf_tbl(ji,jj) * r1_rau0 * zfact
[4666]	887	END DO
	888	! level partially include in ice shelf boundary layer
[4946]	889	phdivn(ji,jj,ikb) = phdivn(ji,jj,ikb) + ( fwfisf(ji,jj) &
[6140]	890	& + fwfisf_b(ji,jj) ) * r1_hisf_tbl(ji,jj) * r1_rau0 * zfact * ralpha(ji,jj)
[4666]	891	END DO
	892	END DO
	893	!
	894	END SUBROUTINE sbc_isf_div
[9019]	895
[6140]	896	!!======================================================================
[4666]	897	END MODULE sbcisf

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source: branches/2017/dev_merge_2017/NEMOGCM/NEMO/OCE_SRC/SBC/sbcisf.F90 @ 9580

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