| 1 | MODULE sbcisf |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE sbcisf *** |
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| 4 | !! Surface module : update surface ocean boundary condition under ice |
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| 5 | !! shelf |
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| 6 | !!====================================================================== |
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| 7 | !! History : 3.2 ! 2011-02 (C.Harris ) Original code isf cav |
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| 8 | !! X.X ! 2006-02 (C. Wang ) Original code bg03 |
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| 9 | !! 3.4 ! 2013-03 (P. Mathiot) Merging + parametrization |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | !! sbc_isf : update sbc under ice shelf |
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| 14 | !!---------------------------------------------------------------------- |
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| 15 | USE oce ! ocean dynamics and tracers |
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| 16 | USE dom_oce ! ocean space and time domain |
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| 17 | USE phycst ! physical constants |
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| 18 | USE eosbn2 ! equation of state |
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| 19 | USE sbc_oce ! surface boundary condition: ocean fields |
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| 20 | USE zdfdrg ! vertical physics: top/bottom drag coef. |
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| 21 | ! |
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| 22 | USE in_out_manager ! I/O manager |
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| 23 | USE iom ! I/O library |
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| 24 | USE fldread ! read input field at current time step |
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| 25 | USE lbclnk ! |
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| 26 | USE lib_fortran ! glob_sum |
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| 27 | |
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| 28 | IMPLICIT NONE |
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| 29 | PRIVATE |
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| 30 | |
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| 31 | PUBLIC sbc_isf, sbc_isf_init, sbc_isf_div, sbc_isf_alloc ! routine called in sbcmod and divhor |
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| 32 | |
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| 33 | ! public in order to be able to output then |
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| 34 | |
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| 35 | REAL(wp), PUBLIC :: rn_hisf_tbl !: thickness of top boundary layer [m] |
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| 36 | INTEGER , PUBLIC :: nn_isf !: flag to choose between explicit/param/specified |
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| 37 | INTEGER , PUBLIC :: nn_isfblk !: flag to choose the bulk formulation to compute the ice shelf melting |
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| 38 | INTEGER , PUBLIC :: nn_gammablk !: flag to choose how the exchange coefficient is computed |
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| 39 | REAL(wp), PUBLIC :: rn_gammat0 !: temperature exchange coeficient [] |
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| 40 | REAL(wp), PUBLIC :: rn_gammas0 !: salinity exchange coeficient [] |
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| 41 | |
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| 42 | INTEGER , PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: misfkt , misfkb !: Level of ice shelf base |
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| 43 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: rzisf_tbl !: depth of calving front (shallowest point) nn_isf ==2/3 |
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| 44 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: rhisf_tbl, rhisf_tbl_0 !: thickness of tbl [m] |
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| 45 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: r1_hisf_tbl !: 1/thickness of tbl |
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| 46 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: ralpha !: proportion of bottom cell influenced by tbl |
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| 47 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: risfLeff !: effective length (Leff) BG03 nn_isf==2 |
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| 48 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: ttbl, stbl, utbl, vtbl !: top boundary layer variable at T point |
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| 49 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: qisf !: net heat flux from ice shelf [W/m2] |
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| 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] |
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| 51 | |
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| 52 | LOGICAL, PUBLIC :: l_isfcpl = .false. !: isf recieved from oasis |
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| 53 | |
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| 54 | REAL(wp), PUBLIC, SAVE :: rcpisf = 2000.0_wp !: specific heat of ice shelf [J/kg/K] |
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| 55 | REAL(wp), PUBLIC, SAVE :: rkappa = 1.54e-6_wp !: heat diffusivity through the ice-shelf [m2/s] |
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| 56 | REAL(wp), PUBLIC, SAVE :: rhoisf = 920.0_wp !: volumic mass of ice shelf [kg/m3] |
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| 57 | REAL(wp), PUBLIC, SAVE :: tsurf = -20.0_wp !: air temperature on top of ice shelf [C] |
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| 58 | REAL(wp), PUBLIC, SAVE :: rLfusisf = 0.334e6_wp !: latent heat of fusion of ice shelf [J/kg] |
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| 59 | |
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| 60 | !: Variable used in fldread to read the forcing file (nn_isf == 4 .OR. nn_isf == 3) |
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| 61 | CHARACTER(len=100), PUBLIC :: cn_dirisf = './' !: Root directory for location of ssr files |
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| 62 | TYPE(FLD_N) , PUBLIC :: sn_fwfisf !: information about the isf melting file to be read |
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| 63 | TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf_fwfisf |
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| 64 | TYPE(FLD_N) , PUBLIC :: sn_rnfisf !: information about the isf melting param. file to be read |
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| 65 | TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf_rnfisf |
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| 66 | TYPE(FLD_N) , PUBLIC :: sn_depmax_isf !: information about the grounding line depth file to be read |
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| 67 | TYPE(FLD_N) , PUBLIC :: sn_depmin_isf !: information about the calving line depth file to be read |
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| 68 | TYPE(FLD_N) , PUBLIC :: sn_Leff_isf !: information about the effective length file to be read |
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| 69 | |
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| 70 | !!---------------------------------------------------------------------- |
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| 71 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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| 72 | !! $Id$ |
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| 73 | !! Software governed by the CeCILL license (see ./LICENSE) |
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| 74 | !!---------------------------------------------------------------------- |
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| 75 | CONTAINS |
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| 76 | |
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| 77 | SUBROUTINE sbc_isf( kt ) |
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| 78 | !!--------------------------------------------------------------------- |
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| 79 | !! *** ROUTINE sbc_isf *** |
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| 80 | !! |
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| 81 | !! ** Purpose : Compute Salt and Heat fluxes related to ice_shelf |
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| 82 | !! melting and freezing |
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| 83 | !! |
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| 84 | !! ** Method : 4 parameterizations are available according to nn_isf |
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| 85 | !! nn_isf = 1 : Realistic ice_shelf formulation |
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| 86 | !! 2 : Beckmann & Goose parameterization |
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| 87 | !! 3 : Specified runoff in deptht (Mathiot & al. ) |
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| 88 | !! 4 : specified fwf and heat flux forcing beneath the ice shelf |
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| 89 | !!---------------------------------------------------------------------- |
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| 90 | INTEGER, INTENT(in) :: kt ! ocean time step |
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| 91 | ! |
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| 92 | INTEGER :: ji, jj, jk ! loop index |
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| 93 | INTEGER :: ikt, ikb ! local integers |
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| 94 | REAL(wp) :: zgreenland_fwfisf_sum, zantarctica_fwfisf_sum |
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| 95 | REAL(wp), DIMENSION(jpi,jpj) :: zt_frz, zdep ! freezing temperature (zt_frz) at depth (zdep) |
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| 96 | REAL(wp), DIMENSION(:,:) , ALLOCATABLE :: zqhcisf2d |
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| 97 | REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: zfwfisf3d, zqhcisf3d, zqlatisf3d |
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| 98 | !!--------------------------------------------------------------------- |
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| 99 | ! |
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| 100 | IF( MOD( kt-1, nn_fsbc) == 0 ) THEN ! compute salt and heat flux |
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| 101 | ! |
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| 102 | SELECT CASE ( nn_isf ) |
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| 103 | CASE ( 1 ) ! realistic ice shelf formulation |
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| 104 | ! compute T/S/U/V for the top boundary layer |
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| 105 | CALL sbc_isf_tbl(tsn(:,:,:,jp_tem),ttbl(:,:),'T') |
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| 106 | CALL sbc_isf_tbl(tsn(:,:,:,jp_sal),stbl(:,:),'T') |
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| 107 | CALL sbc_isf_tbl(un(:,:,:) ,utbl(:,:),'U') |
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| 108 | CALL sbc_isf_tbl(vn(:,:,:) ,vtbl(:,:),'V') |
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| 109 | ! iom print |
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| 110 | CALL iom_put('ttbl',ttbl(:,:)) |
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| 111 | CALL iom_put('stbl',stbl(:,:)) |
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| 112 | CALL iom_put('utbl',utbl(:,:) * (1._wp - tmask(:,:,1)) * ssmask(:,:)) |
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| 113 | CALL iom_put('vtbl',vtbl(:,:) * (1._wp - tmask(:,:,1)) * ssmask(:,:)) |
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| 114 | ! compute fwf and heat flux |
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| 115 | ! compute fwf and heat flux |
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| 116 | IF( .NOT.l_isfcpl ) THEN ; CALL sbc_isf_cav (kt) |
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| 117 | ELSE ; qisf(:,:) = fwfisf(:,:) * rLfusisf ! heat flux |
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| 118 | ENDIF |
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| 119 | ! |
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| 120 | CASE ( 2 ) ! Beckmann and Goosse parametrisation |
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| 121 | stbl(:,:) = soce |
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| 122 | CALL sbc_isf_bg03(kt) |
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| 123 | ! |
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| 124 | CASE ( 3 ) ! specified runoff in depth (Mathiot et al., XXXX in preparation) |
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| 125 | ! specified runoff in depth (Mathiot et al., XXXX in preparation) |
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| 126 | IF( .NOT.l_isfcpl ) THEN |
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| 127 | CALL fld_read ( kt, nn_fsbc, sf_rnfisf ) |
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| 128 | fwfisf(:,:) = - sf_rnfisf(1)%fnow(:,:,1) ! fresh water flux from the isf (fwfisf <0 mean melting) |
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| 129 | ENDIF |
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| 130 | |
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| 131 | IF( lk_oasis) THEN |
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| 132 | ! nn_coupled_iceshelf_fluxes uninitialised unless lk_oasis=true |
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| 133 | IF( nn_coupled_iceshelf_fluxes .gt. 0 ) THEN |
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| 134 | |
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| 135 | ! Adjust total iceshelf melt rates so that sum of iceberg calving and iceshelf melting in the northern |
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| 136 | ! and southern hemispheres equals rate of increase of mass of greenland and antarctic ice sheets |
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| 137 | ! to preserve total freshwater conservation in coupled models without an active ice sheet model. |
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| 138 | |
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| 139 | ! All related global sums must be done bit reproducibly |
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| 140 | zgreenland_fwfisf_sum = glob_sum( fwfisf(:,:) * e1t(:,:) * e2t(:,:) * greenland_icesheet_mask(:,:) ) |
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| 141 | |
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| 142 | ! use ABS function because we need to preserve the sign of fwfisf |
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| 143 | WHERE( greenland_icesheet_mask(:,:) == 1.0 ) & |
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| 144 | & fwfisf(:,:) = fwfisf(:,:) * ABS( greenland_icesheet_mass_rate_of_change * (1.0-rn_greenland_calving_fraction) & |
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| 145 | & / ( zgreenland_fwfisf_sum + 1.0e-10_wp ) ) |
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| 146 | |
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| 147 | ! check |
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| 148 | IF(lwp .AND. ll_wrtstp) WRITE(numout, *) 'Greenland iceshelf melting climatology (kg/s) : ',zgreenland_fwfisf_sum |
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| 149 | |
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| 150 | zgreenland_fwfisf_sum = glob_sum( fwfisf(:,:) * e1t(:,:) * e2t(:,:) * greenland_icesheet_mask(:,:) ) |
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| 151 | |
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| 152 | IF(lwp .AND. ll_wrtstp) WRITE(numout, *) 'Greenland iceshelf melting adjusted value (kg/s) : ',zgreenland_fwfisf_sum |
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| 153 | |
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| 154 | zantarctica_fwfisf_sum = glob_sum( fwfisf(:,:) * e1t(:,:) * e2t(:,:) * antarctica_icesheet_mask(:,:) ) |
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| 155 | |
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| 156 | ! use ABS function because we need to preserve the sign of fwfisf |
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| 157 | WHERE( antarctica_icesheet_mask(:,:) == 1.0 ) & |
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| 158 | & fwfisf(:,:) = fwfisf(:,:) * ABS( antarctica_icesheet_mass_rate_of_change * (1.0-rn_antarctica_calving_fraction) & |
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| 159 | & / ( zantarctica_fwfisf_sum + 1.0e-10_wp ) ) |
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| 160 | |
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| 161 | ! check |
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| 162 | IF(lwp .AND. ll_wrtstp) WRITE(numout, *) 'Antarctica iceshelf melting climatology (kg/s) : ',zantarctica_fwfisf_sum |
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| 163 | |
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| 164 | zantarctica_fwfisf_sum = glob_sum( fwfisf(:,:) * e1t(:,:) * e2t(:,:) * antarctica_icesheet_mask(:,:) ) |
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| 165 | |
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| 166 | IF(lwp .AND. ll_wrtstp) WRITE(numout, *) 'Antarctica iceshelf melting adjusted value (kg/s) : ',zantarctica_fwfisf_sum |
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| 167 | |
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| 168 | ENDIF |
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| 169 | ENDIF |
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| 170 | |
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| 171 | qisf(:,:) = fwfisf(:,:) * rLfusisf ! heat flux |
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| 172 | stbl(:,:) = soce |
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| 173 | ! |
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| 174 | CASE ( 4 ) ! specified fwf and heat flux forcing beneath the ice shelf |
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| 175 | ! ! specified fwf and heat flux forcing beneath the ice shelf |
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| 176 | IF( .NOT.l_isfcpl ) THEN |
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| 177 | CALL fld_read ( kt, nn_fsbc, sf_fwfisf ) |
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| 178 | !CALL fld_read ( kt, nn_fsbc, sf_qisf ) |
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| 179 | fwfisf(:,:) = -sf_fwfisf(1)%fnow(:,:,1) ! fwf |
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| 180 | ENDIF |
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| 181 | |
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| 182 | IF( lk_oasis) THEN |
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| 183 | ! nn_coupled_iceshelf_fluxes uninitialised unless lk_oasis=true |
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| 184 | IF( nn_coupled_iceshelf_fluxes .gt. 0 ) THEN |
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| 185 | |
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| 186 | ! Adjust total iceshelf melt rates so that sum of iceberg calving and iceshelf melting in the northern |
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| 187 | ! and southern hemispheres equals rate of increase of mass of greenland and antarctic ice sheets |
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| 188 | ! to preserve total freshwater conservation in coupled models without an active ice sheet model. |
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| 189 | |
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| 190 | ! All related global sums must be done bit reproducibly |
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| 191 | zgreenland_fwfisf_sum = glob_sum( fwfisf(:,:) * e1t(:,:) * e2t(:,:) * greenland_icesheet_mask(:,:) ) |
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| 192 | |
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| 193 | ! use ABS function because we need to preserve the sign of fwfisf |
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| 194 | WHERE( greenland_icesheet_mask(:,:) == 1.0 ) & |
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| 195 | & fwfisf(:,:) = fwfisf(:,:) * ABS( greenland_icesheet_mass_rate_of_change * (1.0-rn_greenland_calving_fraction) & |
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| 196 | & / ( zgreenland_fwfisf_sum + 1.0e-10_wp ) ) |
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| 197 | |
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| 198 | ! check |
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| 199 | IF(lwp .AND. ll_wrtstp) WRITE(numout, *) 'Greenland iceshelf melting climatology (kg/s) : ',zgreenland_fwfisf_sum |
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| 200 | |
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| 201 | zgreenland_fwfisf_sum = glob_sum( fwfisf(:,:) * e1t(:,:) * e2t(:,:) * greenland_icesheet_mask(:,:) ) |
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| 202 | |
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| 203 | IF(lwp .AND. ll_wrtstp) WRITE(numout, *) 'Greenland iceshelf melting adjusted value (kg/s) : ',zgreenland_fwfisf_sum |
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| 204 | |
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| 205 | zantarctica_fwfisf_sum = glob_sum( fwfisf(:,:) * e1t(:,:) * e2t(:,:) * antarctica_icesheet_mask(:,:) ) |
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| 206 | |
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| 207 | ! use ABS function because we need to preserve the sign of fwfisf |
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| 208 | WHERE( antarctica_icesheet_mask(:,:) == 1.0 ) & |
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| 209 | & fwfisf(:,:) = fwfisf(:,:) * ABS( antarctica_icesheet_mass_rate_of_change * (1.0-rn_antarctica_calving_fraction) & |
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| 210 | & / ( zantarctica_fwfisf_sum + 1.0e-10_wp ) ) |
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| 211 | |
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| 212 | ! check |
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| 213 | IF(lwp .AND. ll_wrtstp) WRITE(numout, *) 'Antarctica iceshelf melting climatology (kg/s) : ',zantarctica_fwfisf_sum |
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| 214 | |
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| 215 | zantarctica_fwfisf_sum = glob_sum( fwfisf(:,:) * e1t(:,:) * e2t(:,:) * antarctica_icesheet_mask(:,:) ) |
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| 216 | |
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| 217 | IF(lwp .AND. ll_wrtstp) WRITE(numout, *) 'Antarctica iceshelf melting adjusted value (kg/s) : ',zantarctica_fwfisf_sum |
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| 218 | |
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| 219 | ENDIF |
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| 220 | ENDIF |
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| 221 | |
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| 222 | qisf(:,:) = fwfisf(:,:) * rLfusisf ! heat flux |
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| 223 | stbl(:,:) = soce |
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| 224 | ! |
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| 225 | END SELECT |
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| 226 | |
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| 227 | ! compute tsc due to isf |
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| 228 | ! isf melting implemented as a volume flux and we assume that melt water is at 0 PSU. |
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| 229 | ! WARNING water add at temp = 0C, need to add a correction term (fwfisf * tfreez / rau0). |
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| 230 | ! compute freezing point beneath ice shelf (or top cell if nn_isf = 3) |
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| 231 | DO jj = 1,jpj |
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| 232 | DO ji = 1,jpi |
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| 233 | zdep(ji,jj)=gdepw_n(ji,jj,misfkt(ji,jj)) |
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| 234 | END DO |
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| 235 | END DO |
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| 236 | CALL eos_fzp( stbl(:,:), zt_frz(:,:), zdep(:,:) ) |
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| 237 | |
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| 238 | risf_tsc(:,:,jp_tem) = qisf(:,:) * r1_rau0_rcp - fwfisf(:,:) * zt_frz(:,:) * r1_rau0 ! |
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| 239 | risf_tsc(:,:,jp_sal) = 0.0_wp |
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| 240 | |
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| 241 | ! lbclnk |
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| 242 | CALL lbc_lnk_multi( 'sbcisf', risf_tsc(:,:,jp_tem), 'T', 1., risf_tsc(:,:,jp_sal), 'T', 1., fwfisf,'T', 1., qisf, 'T', 1.) |
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| 243 | ! output |
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| 244 | IF( iom_use('iceshelf_cea') ) CALL iom_put( 'iceshelf_cea', -fwfisf(:,:) ) ! isf mass flux |
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| 245 | IF( iom_use('hflx_isf_cea') ) CALL iom_put( 'hflx_isf_cea', risf_tsc(:,:,jp_tem) * rau0 * rcp ) ! isf sensible+latent heat (W/m2) |
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| 246 | IF( iom_use('qlatisf' ) ) CALL iom_put( 'qlatisf' , qisf(:,:) ) ! isf latent heat |
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| 247 | IF( iom_use('fwfisf' ) ) CALL iom_put( 'fwfisf' , fwfisf(:,:) ) ! isf mass flux (opposite sign) |
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| 248 | |
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| 249 | ! Diagnostics |
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| 250 | IF( iom_use('fwfisf3d') .OR. iom_use('qlatisf3d') .OR. iom_use('qhcisf3d') .OR. iom_use('qhcisf')) THEN |
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| 251 | ALLOCATE( zfwfisf3d(jpi,jpj,jpk) , zqhcisf3d(jpi,jpj,jpk) , zqlatisf3d(jpi,jpj,jpk) ) |
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| 252 | ALLOCATE( zqhcisf2d(jpi,jpj) ) |
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| 253 | ! |
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| 254 | zfwfisf3d (:,:,:) = 0._wp ! 3d ice shelf melting (kg/m2/s) |
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| 255 | zqhcisf3d (:,:,:) = 0._wp ! 3d heat content flux (W/m2) |
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| 256 | zqlatisf3d(:,:,:) = 0._wp ! 3d ice shelf melting latent heat flux (W/m2) |
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| 257 | zqhcisf2d (:,:) = fwfisf(:,:) * zt_frz * rcp ! 2d heat content flux (W/m2) |
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| 258 | ! |
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| 259 | DO jj = 1,jpj |
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| 260 | DO ji = 1,jpi |
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| 261 | ikt = misfkt(ji,jj) |
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| 262 | ikb = misfkb(ji,jj) |
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| 263 | DO jk = ikt, ikb - 1 |
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| 264 | zfwfisf3d (ji,jj,jk) = zfwfisf3d (ji,jj,jk) + fwfisf (ji,jj) * r1_hisf_tbl(ji,jj) * e3t_n(ji,jj,jk) |
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| 265 | zqhcisf3d (ji,jj,jk) = zqhcisf3d (ji,jj,jk) + zqhcisf2d(ji,jj) * r1_hisf_tbl(ji,jj) * e3t_n(ji,jj,jk) |
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| 266 | zqlatisf3d(ji,jj,jk) = zqlatisf3d(ji,jj,jk) + qisf (ji,jj) * r1_hisf_tbl(ji,jj) * e3t_n(ji,jj,jk) |
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| 267 | END DO |
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| 268 | zfwfisf3d (ji,jj,jk) = zfwfisf3d (ji,jj,jk) + fwfisf (ji,jj) * r1_hisf_tbl(ji,jj) & |
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| 269 | & * ralpha(ji,jj) * e3t_n(ji,jj,jk) |
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| 270 | zqhcisf3d (ji,jj,jk) = zqhcisf3d (ji,jj,jk) + zqhcisf2d(ji,jj) * r1_hisf_tbl(ji,jj) & |
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| 271 | & * ralpha(ji,jj) * e3t_n(ji,jj,jk) |
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| 272 | zqlatisf3d(ji,jj,jk) = zqlatisf3d(ji,jj,jk) + qisf (ji,jj) * r1_hisf_tbl(ji,jj) & |
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| 273 | & * ralpha(ji,jj) * e3t_n(ji,jj,jk) |
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| 274 | END DO |
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| 275 | END DO |
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| 276 | ! |
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| 277 | CALL iom_put('fwfisf3d' , zfwfisf3d (:,:,:)) |
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| 278 | CALL iom_put('qlatisf3d', zqlatisf3d(:,:,:)) |
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| 279 | CALL iom_put('qhcisf3d' , zqhcisf3d (:,:,:)) |
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| 280 | CALL iom_put('qhcisf' , zqhcisf2d (:,: )) |
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| 281 | ! |
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| 282 | DEALLOCATE( zfwfisf3d, zqhcisf3d, zqlatisf3d ) |
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| 283 | DEALLOCATE( zqhcisf2d ) |
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| 284 | ENDIF |
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| 285 | ! |
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| 286 | ENDIF |
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| 287 | |
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| 288 | IF( kt == nit000 ) THEN ! set the forcing field at nit000 - 1 ! |
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| 289 | IF( ln_rstart .AND. & ! Restart: read in restart file |
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| 290 | & iom_varid( numror, 'fwf_isf_b', ldstop = .FALSE. ) > 0 ) THEN |
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| 291 | IF(lwp) WRITE(numout,*) ' nit000-1 isf tracer content forcing fields read in the restart file' |
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| 292 | CALL iom_get( numror, jpdom_autoglo, 'fwf_isf_b', fwfisf_b(:,:) , ldxios = lrxios ) ! before salt content isf_tsc trend |
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| 293 | CALL iom_get( numror, jpdom_autoglo, 'isf_sc_b' , risf_tsc_b(:,:,jp_sal), ldxios = lrxios ) ! before salt content isf_tsc trend |
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| 294 | CALL iom_get( numror, jpdom_autoglo, 'isf_hc_b' , risf_tsc_b(:,:,jp_tem), ldxios = lrxios ) ! before salt content isf_tsc trend |
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| 295 | ELSE |
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| 296 | fwfisf_b(:,:) = fwfisf(:,:) |
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| 297 | risf_tsc_b(:,:,:)= risf_tsc(:,:,:) |
|---|
| 298 | ENDIF |
|---|
| 299 | ENDIF |
|---|
| 300 | ! |
|---|
| 301 | IF( lrst_oce ) THEN |
|---|
| 302 | IF(lwp) WRITE(numout,*) |
|---|
| 303 | IF(lwp) WRITE(numout,*) 'sbc : isf surface tracer content forcing fields written in ocean restart file ', & |
|---|
| 304 | & 'at it= ', kt,' date= ', ndastp |
|---|
| 305 | IF(lwp) WRITE(numout,*) '~~~~' |
|---|
| 306 | IF( lwxios ) CALL iom_swap( cwxios_context ) |
|---|
| 307 | CALL iom_rstput( kt, nitrst, numrow, 'fwf_isf_b', fwfisf(:,:) , ldxios = lwxios ) |
|---|
| 308 | CALL iom_rstput( kt, nitrst, numrow, 'isf_hc_b' , risf_tsc(:,:,jp_tem), ldxios = lwxios ) |
|---|
| 309 | CALL iom_rstput( kt, nitrst, numrow, 'isf_sc_b' , risf_tsc(:,:,jp_sal), ldxios = lwxios ) |
|---|
| 310 | IF( lwxios ) CALL iom_swap( cxios_context ) |
|---|
| 311 | ENDIF |
|---|
| 312 | ! |
|---|
| 313 | END SUBROUTINE sbc_isf |
|---|
| 314 | |
|---|
| 315 | |
|---|
| 316 | INTEGER FUNCTION sbc_isf_alloc() |
|---|
| 317 | !!---------------------------------------------------------------------- |
|---|
| 318 | !! *** FUNCTION sbc_isf_rnf_alloc *** |
|---|
| 319 | !!---------------------------------------------------------------------- |
|---|
| 320 | sbc_isf_alloc = 0 ! set to zero if no array to be allocated |
|---|
| 321 | IF( .NOT. ALLOCATED( qisf ) ) THEN |
|---|
| 322 | ALLOCATE( risf_tsc(jpi,jpj,jpts), risf_tsc_b(jpi,jpj,jpts), qisf(jpi,jpj) , & |
|---|
| 323 | & rhisf_tbl(jpi,jpj) , r1_hisf_tbl(jpi,jpj), rzisf_tbl(jpi,jpj) , & |
|---|
| 324 | & ttbl(jpi,jpj) , stbl(jpi,jpj) , utbl(jpi,jpj) , & |
|---|
| 325 | & vtbl(jpi, jpj) , risfLeff(jpi,jpj) , rhisf_tbl_0(jpi,jpj), & |
|---|
| 326 | & ralpha(jpi,jpj) , misfkt(jpi,jpj) , misfkb(jpi,jpj) , & |
|---|
| 327 | & STAT= sbc_isf_alloc ) |
|---|
| 328 | ! |
|---|
| 329 | CALL mpp_sum ( 'sbcisf', sbc_isf_alloc ) |
|---|
| 330 | IF( sbc_isf_alloc /= 0 ) CALL ctl_stop( 'STOP', 'sbc_isf_alloc: failed to allocate arrays.' ) |
|---|
| 331 | ! |
|---|
| 332 | ENDIF |
|---|
| 333 | END FUNCTION |
|---|
| 334 | |
|---|
| 335 | |
|---|
| 336 | SUBROUTINE sbc_isf_init |
|---|
| 337 | !!--------------------------------------------------------------------- |
|---|
| 338 | !! *** ROUTINE sbc_isf_init *** |
|---|
| 339 | !! |
|---|
| 340 | !! ** Purpose : Initialisation of variables for iceshelf fluxes formulation |
|---|
| 341 | !! |
|---|
| 342 | !! ** Method : 4 parameterizations are available according to nn_isf |
|---|
| 343 | !! nn_isf = 1 : Realistic ice_shelf formulation |
|---|
| 344 | !! 2 : Beckmann & Goose parameterization |
|---|
| 345 | !! 3 : Specified runoff in deptht (Mathiot & al. ) |
|---|
| 346 | !! 4 : specified fwf and heat flux forcing beneath the ice shelf |
|---|
| 347 | !!---------------------------------------------------------------------- |
|---|
| 348 | INTEGER :: ji, jj, jk ! loop index |
|---|
| 349 | INTEGER :: ik ! current level index |
|---|
| 350 | INTEGER :: ikt, ikb ! top and bottom level of the isf boundary layer |
|---|
| 351 | INTEGER :: inum, ierror |
|---|
| 352 | INTEGER :: ios ! Local integer output status for namelist read |
|---|
| 353 | REAL(wp) :: zhk |
|---|
| 354 | CHARACTER(len=256) :: cvarzisf, cvarhisf ! name for isf file |
|---|
| 355 | CHARACTER(LEN=32 ) :: cvarLeff ! variable name for efficient Length scale |
|---|
| 356 | !!---------------------------------------------------------------------- |
|---|
| 357 | NAMELIST/namsbc_isf/ nn_isfblk, rn_hisf_tbl, rn_gammat0, rn_gammas0, nn_gammablk, nn_isf, & |
|---|
| 358 | & sn_fwfisf, sn_rnfisf, sn_depmax_isf, sn_depmin_isf, sn_Leff_isf |
|---|
| 359 | !!---------------------------------------------------------------------- |
|---|
| 360 | |
|---|
| 361 | REWIND( numnam_ref ) ! Namelist namsbc_rnf in reference namelist : Runoffs |
|---|
| 362 | READ ( numnam_ref, namsbc_isf, IOSTAT = ios, ERR = 901) |
|---|
| 363 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_isf in reference namelist' ) |
|---|
| 364 | |
|---|
| 365 | REWIND( numnam_cfg ) ! Namelist namsbc_rnf in configuration namelist : Runoffs |
|---|
| 366 | READ ( numnam_cfg, namsbc_isf, IOSTAT = ios, ERR = 902 ) |
|---|
| 367 | 902 IF( ios > 0 ) CALL ctl_nam ( ios , 'namsbc_isf in configuration namelist' ) |
|---|
| 368 | IF(lwm) WRITE ( numond, namsbc_isf ) |
|---|
| 369 | |
|---|
| 370 | IF(lwp) WRITE(numout,*) |
|---|
| 371 | IF(lwp) WRITE(numout,*) 'sbc_isf_init : heat flux of the ice shelf' |
|---|
| 372 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~' |
|---|
| 373 | IF(lwp) WRITE(numout,*) ' Namelist namsbc_isf :' |
|---|
| 374 | IF(lwp) WRITE(numout,*) ' type ice shelf melting/freezing nn_isf = ', nn_isf |
|---|
| 375 | IF(lwp) WRITE(numout,*) ' bulk formulation (nn_isf=1 only) nn_isfblk = ', nn_isfblk |
|---|
| 376 | IF(lwp) WRITE(numout,*) ' thickness of the top boundary layer rn_hisf_tbl = ', rn_hisf_tbl |
|---|
| 377 | IF(lwp) WRITE(numout,*) ' gamma formulation nn_gammablk = ', nn_gammablk |
|---|
| 378 | IF(lwp) WRITE(numout,*) ' gammat coefficient rn_gammat0 = ', rn_gammat0 |
|---|
| 379 | IF(lwp) WRITE(numout,*) ' gammas coefficient rn_gammas0 = ', rn_gammas0 |
|---|
| 380 | IF(lwp) WRITE(numout,*) ' top drag coef. used (from namdrg_top) rn_Cd0 = ', r_Cdmin_top |
|---|
| 381 | |
|---|
| 382 | |
|---|
| 383 | ! 1 = presence of ISF 2 = bg03 parametrisation |
|---|
| 384 | ! 3 = rnf file for isf 4 = ISF fwf specified |
|---|
| 385 | ! option 1 and 4 need ln_isfcav = .true. (domzgr) |
|---|
| 386 | ! |
|---|
| 387 | ! Allocate public variable |
|---|
| 388 | IF ( sbc_isf_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'sbc_isf : unable to allocate arrays' ) |
|---|
| 389 | ! |
|---|
| 390 | ! initialisation |
|---|
| 391 | qisf (:,:) = 0._wp ; fwfisf (:,:) = 0._wp |
|---|
| 392 | risf_tsc(:,:,:) = 0._wp ; fwfisf_b(:,:) = 0._wp |
|---|
| 393 | ! |
|---|
| 394 | ! define isf tbl tickness, top and bottom indice |
|---|
| 395 | SELECT CASE ( nn_isf ) |
|---|
| 396 | CASE ( 1 ) |
|---|
| 397 | IF(lwp) WRITE(numout,*) |
|---|
| 398 | IF(lwp) WRITE(numout,*) ' ==>>> presence of under iceshelf seas (nn_isf = 1)' |
|---|
| 399 | rhisf_tbl(:,:) = rn_hisf_tbl |
|---|
| 400 | misfkt (:,:) = mikt(:,:) ! same indice for bg03 et cav => used in isfdiv |
|---|
| 401 | ! |
|---|
| 402 | CASE ( 2 , 3 ) |
|---|
| 403 | IF( .NOT.l_isfcpl ) THEN |
|---|
| 404 | ALLOCATE( sf_rnfisf(1), STAT=ierror ) |
|---|
| 405 | ALLOCATE( sf_rnfisf(1)%fnow(jpi,jpj,1), sf_rnfisf(1)%fdta(jpi,jpj,1,2) ) |
|---|
| 406 | CALL fld_fill( sf_rnfisf, (/ sn_rnfisf /), cn_dirisf, 'sbc_isf_init', 'read fresh water flux isf data', 'namsbc_isf' ) |
|---|
| 407 | ENDIF |
|---|
| 408 | ! read effective lenght (BG03) |
|---|
| 409 | IF( nn_isf == 2 ) THEN |
|---|
| 410 | IF(lwp) WRITE(numout,*) |
|---|
| 411 | IF(lwp) WRITE(numout,*) ' ==>>> bg03 parametrisation (nn_isf = 2)' |
|---|
| 412 | CALL iom_open( sn_Leff_isf%clname, inum ) |
|---|
| 413 | cvarLeff = TRIM(sn_Leff_isf%clvar) |
|---|
| 414 | CALL iom_get( inum, jpdom_data, cvarLeff, risfLeff , 1) |
|---|
| 415 | CALL iom_close(inum) |
|---|
| 416 | ! |
|---|
| 417 | risfLeff = risfLeff*1000.0_wp !: convertion in m |
|---|
| 418 | ELSE |
|---|
| 419 | IF(lwp) WRITE(numout,*) |
|---|
| 420 | IF(lwp) WRITE(numout,*) ' ==>>> rnf file for isf (nn_isf = 3)' |
|---|
| 421 | ENDIF |
|---|
| 422 | ! read depth of the top and bottom of the isf top boundary layer (in this case, isf front depth and grounding line depth) |
|---|
| 423 | CALL iom_open( sn_depmax_isf%clname, inum ) |
|---|
| 424 | cvarhisf = TRIM(sn_depmax_isf%clvar) |
|---|
| 425 | CALL iom_get( inum, jpdom_data, cvarhisf, rhisf_tbl, 1) !: depth of deepest point of the ice shelf base |
|---|
| 426 | CALL iom_close(inum) |
|---|
| 427 | ! |
|---|
| 428 | CALL iom_open( sn_depmin_isf%clname, inum ) |
|---|
| 429 | cvarzisf = TRIM(sn_depmin_isf%clvar) |
|---|
| 430 | CALL iom_get( inum, jpdom_data, cvarzisf, rzisf_tbl, 1) !: depth of shallowest point of the ice shelves base |
|---|
| 431 | CALL iom_close(inum) |
|---|
| 432 | ! |
|---|
| 433 | rhisf_tbl(:,:) = rhisf_tbl(:,:) - rzisf_tbl(:,:) !: tickness isf boundary layer |
|---|
| 434 | |
|---|
| 435 | !! compute first level of the top boundary layer |
|---|
| 436 | DO ji = 1, jpi |
|---|
| 437 | DO jj = 1, jpj |
|---|
| 438 | ik = 2 |
|---|
| 439 | !!gm potential bug: use gdepw_0 not _n |
|---|
| 440 | DO WHILE ( ik <= mbkt(ji,jj) .AND. gdepw_n(ji,jj,ik) < rzisf_tbl(ji,jj) ) ; ik = ik + 1 ; END DO |
|---|
| 441 | misfkt(ji,jj) = ik-1 |
|---|
| 442 | END DO |
|---|
| 443 | END DO |
|---|
| 444 | ! |
|---|
| 445 | CASE ( 4 ) |
|---|
| 446 | IF(lwp) WRITE(numout,*) |
|---|
| 447 | IF(lwp) WRITE(numout,*) ' ==>>> specified fresh water flux in ISF (nn_isf = 4)' |
|---|
| 448 | ! as in nn_isf == 1 |
|---|
| 449 | rhisf_tbl(:,:) = rn_hisf_tbl |
|---|
| 450 | misfkt (:,:) = mikt(:,:) ! same indice for bg03 et cav => used in isfdiv |
|---|
| 451 | ! |
|---|
| 452 | ! load variable used in fldread (use for temporal interpolation of isf fwf forcing) |
|---|
| 453 | IF( .NOT.l_isfcpl ) THEN |
|---|
| 454 | ALLOCATE( sf_fwfisf(1), STAT=ierror ) |
|---|
| 455 | ALLOCATE( sf_fwfisf(1)%fnow(jpi,jpj,1), sf_fwfisf(1)%fdta(jpi,jpj,1,2) ) |
|---|
| 456 | CALL fld_fill( sf_fwfisf, (/ sn_fwfisf /), cn_dirisf, 'sbc_isf_init', 'read fresh water flux isf data', 'namsbc_isf' ) |
|---|
| 457 | ENDIF |
|---|
| 458 | ! |
|---|
| 459 | CASE DEFAULT |
|---|
| 460 | CALL ctl_stop( 'sbc_isf_init: wrong value of nn_isf' ) |
|---|
| 461 | END SELECT |
|---|
| 462 | |
|---|
| 463 | rhisf_tbl_0(:,:) = rhisf_tbl(:,:) |
|---|
| 464 | |
|---|
| 465 | ! compute bottom level of isf tbl and thickness of tbl below the ice shelf |
|---|
| 466 | DO jj = 1,jpj |
|---|
| 467 | DO ji = 1,jpi |
|---|
| 468 | ikt = misfkt(ji,jj) |
|---|
| 469 | ikb = misfkt(ji,jj) |
|---|
| 470 | ! thickness of boundary layer at least the top level thickness |
|---|
| 471 | rhisf_tbl(ji,jj) = MAX(rhisf_tbl_0(ji,jj), e3t_n(ji,jj,ikt)) |
|---|
| 472 | |
|---|
| 473 | ! determine the deepest level influenced by the boundary layer |
|---|
| 474 | DO jk = ikt+1, mbkt(ji,jj) |
|---|
| 475 | IF( (SUM(e3t_n(ji,jj,ikt:jk-1)) < rhisf_tbl(ji,jj)) .AND. (tmask(ji,jj,jk) == 1) ) ikb = jk |
|---|
| 476 | END DO |
|---|
| 477 | rhisf_tbl(ji,jj) = MIN(rhisf_tbl(ji,jj), SUM(e3t_n(ji,jj,ikt:ikb))) ! limit the tbl to water thickness. |
|---|
| 478 | misfkb(ji,jj) = ikb ! last wet level of the tbl |
|---|
| 479 | r1_hisf_tbl(ji,jj) = 1._wp / rhisf_tbl(ji,jj) |
|---|
| 480 | |
|---|
| 481 | 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 |
|---|
| 482 | ralpha(ji,jj) = rhisf_tbl(ji,jj) * (1._wp - zhk ) / e3t_n(ji,jj,ikb) ! proportion of bottom cell influenced by boundary layer |
|---|
| 483 | END DO |
|---|
| 484 | END DO |
|---|
| 485 | |
|---|
| 486 | IF( lwxios ) THEN |
|---|
| 487 | CALL iom_set_rstw_var_active('fwf_isf_b') |
|---|
| 488 | CALL iom_set_rstw_var_active('isf_hc_b') |
|---|
| 489 | CALL iom_set_rstw_var_active('isf_sc_b') |
|---|
| 490 | ENDIF |
|---|
| 491 | |
|---|
| 492 | |
|---|
| 493 | END SUBROUTINE sbc_isf_init |
|---|
| 494 | |
|---|
| 495 | |
|---|
| 496 | SUBROUTINE sbc_isf_bg03(kt) |
|---|
| 497 | !!--------------------------------------------------------------------- |
|---|
| 498 | !! *** ROUTINE sbc_isf_bg03 *** |
|---|
| 499 | !! |
|---|
| 500 | !! ** Purpose : add net heat and fresh water flux from ice shelf melting |
|---|
| 501 | !! into the adjacent ocean |
|---|
| 502 | !! |
|---|
| 503 | !! ** Method : See reference |
|---|
| 504 | !! |
|---|
| 505 | !! ** Reference : Beckmann and Goosse (2003), "A parameterization of ice shelf-ocean |
|---|
| 506 | !! interaction for climate models", Ocean Modelling 5(2003) 157-170. |
|---|
| 507 | !! (hereafter BG) |
|---|
| 508 | !! History : 06-02 (C. Wang) Original code |
|---|
| 509 | !!---------------------------------------------------------------------- |
|---|
| 510 | INTEGER, INTENT ( in ) :: kt |
|---|
| 511 | ! |
|---|
| 512 | INTEGER :: ji, jj, jk ! dummy loop index |
|---|
| 513 | INTEGER :: ik ! current level |
|---|
| 514 | REAL(wp) :: zt_sum ! sum of the temperature between 200m and 600m |
|---|
| 515 | REAL(wp) :: zt_ave ! averaged temperature between 200m and 600m |
|---|
| 516 | REAL(wp) :: zt_frz ! freezing point temperature at depth z |
|---|
| 517 | REAL(wp) :: zpress ! pressure to compute the freezing point in depth |
|---|
| 518 | !!---------------------------------------------------------------------- |
|---|
| 519 | ! |
|---|
| 520 | DO ji = 1, jpi |
|---|
| 521 | DO jj = 1, jpj |
|---|
| 522 | ik = misfkt(ji,jj) |
|---|
| 523 | !! Initialize arrays to 0 (each step) |
|---|
| 524 | zt_sum = 0.e0_wp |
|---|
| 525 | IF ( ik > 1 ) THEN |
|---|
| 526 | ! 1. -----------the average temperature between 200m and 600m --------------------- |
|---|
| 527 | DO jk = misfkt(ji,jj),misfkb(ji,jj) |
|---|
| 528 | ! Calculate freezing temperature |
|---|
| 529 | zpress = grav*rau0*gdept_n(ji,jj,ik)*1.e-04 |
|---|
| 530 | CALL eos_fzp(stbl(ji,jj), zt_frz, zpress) |
|---|
| 531 | zt_sum = zt_sum + (tsn(ji,jj,jk,jp_tem)-zt_frz) * e3t_n(ji,jj,jk) * tmask(ji,jj,jk) ! sum temp |
|---|
| 532 | END DO |
|---|
| 533 | zt_ave = zt_sum/rhisf_tbl(ji,jj) ! calcul mean value |
|---|
| 534 | ! 2. ------------Net heat flux and fresh water flux due to the ice shelf |
|---|
| 535 | ! For those corresponding to zonal boundary |
|---|
| 536 | qisf(ji,jj) = - rau0 * rcp * rn_gammat0 * risfLeff(ji,jj) * e1t(ji,jj) * zt_ave & |
|---|
| 537 | & * r1_e1e2t(ji,jj) * tmask(ji,jj,jk) |
|---|
| 538 | |
|---|
| 539 | fwfisf(ji,jj) = qisf(ji,jj) / rLfusisf !fresh water flux kg/(m2s) |
|---|
| 540 | fwfisf(ji,jj) = fwfisf(ji,jj) * ( soce / stbl(ji,jj) ) |
|---|
| 541 | !add to salinity trend |
|---|
| 542 | ELSE |
|---|
| 543 | qisf(ji,jj) = 0._wp ; fwfisf(ji,jj) = 0._wp |
|---|
| 544 | END IF |
|---|
| 545 | END DO |
|---|
| 546 | END DO |
|---|
| 547 | ! |
|---|
| 548 | END SUBROUTINE sbc_isf_bg03 |
|---|
| 549 | |
|---|
| 550 | |
|---|
| 551 | SUBROUTINE sbc_isf_cav( kt ) |
|---|
| 552 | !!--------------------------------------------------------------------- |
|---|
| 553 | !! *** ROUTINE sbc_isf_cav *** |
|---|
| 554 | !! |
|---|
| 555 | !! ** Purpose : handle surface boundary condition under ice shelf |
|---|
| 556 | !! |
|---|
| 557 | !! ** Method : - |
|---|
| 558 | !! |
|---|
| 559 | !! ** Action : utau, vtau : remain unchanged |
|---|
| 560 | !! taum, wndm : remain unchanged |
|---|
| 561 | !! qns : update heat flux below ice shelf |
|---|
| 562 | !! emp, emps : update freshwater flux below ice shelf |
|---|
| 563 | !!--------------------------------------------------------------------- |
|---|
| 564 | INTEGER, INTENT(in) :: kt ! ocean time step |
|---|
| 565 | ! |
|---|
| 566 | INTEGER :: ji, jj ! dummy loop indices |
|---|
| 567 | INTEGER :: nit |
|---|
| 568 | LOGICAL :: lit |
|---|
| 569 | REAL(wp) :: zlamb1, zlamb2, zlamb3 |
|---|
| 570 | REAL(wp) :: zeps1,zeps2,zeps3,zeps4,zeps6,zeps7 |
|---|
| 571 | REAL(wp) :: zaqe,zbqe,zcqe,zaqer,zdis,zsfrz,zcfac |
|---|
| 572 | REAL(wp) :: zeps = 1.e-20_wp |
|---|
| 573 | REAL(wp) :: zerr |
|---|
| 574 | REAL(wp), DIMENSION(jpi,jpj) :: zfrz |
|---|
| 575 | REAL(wp), DIMENSION(jpi,jpj) :: zgammat, zgammas |
|---|
| 576 | REAL(wp), DIMENSION(jpi,jpj) :: zfwflx, zhtflx, zhtflx_b |
|---|
| 577 | !!--------------------------------------------------------------------- |
|---|
| 578 | ! |
|---|
| 579 | ! coeficient for linearisation of potential tfreez |
|---|
| 580 | ! Crude approximation for pressure (but commonly used) |
|---|
| 581 | IF ( l_useCT ) THEN ! linearisation from Jourdain et al. (2017) |
|---|
| 582 | zlamb1 =-0.0564_wp |
|---|
| 583 | zlamb2 = 0.0773_wp |
|---|
| 584 | zlamb3 =-7.8633e-8 * grav * rau0 |
|---|
| 585 | ELSE ! linearisation from table 4 (Asay-Davis et al., 2015) |
|---|
| 586 | zlamb1 =-0.0573_wp |
|---|
| 587 | zlamb2 = 0.0832_wp |
|---|
| 588 | zlamb3 =-7.53e-8 * grav * rau0 |
|---|
| 589 | ENDIF |
|---|
| 590 | ! |
|---|
| 591 | ! initialisation |
|---|
| 592 | zgammat(:,:) = rn_gammat0 ; zgammas (:,:) = rn_gammas0 |
|---|
| 593 | zhtflx (:,:) = 0.0_wp ; zhtflx_b(:,:) = 0.0_wp |
|---|
| 594 | zfwflx (:,:) = 0.0_wp |
|---|
| 595 | |
|---|
| 596 | ! compute ice shelf melting |
|---|
| 597 | nit = 1 ; lit = .TRUE. |
|---|
| 598 | DO WHILE ( lit ) ! maybe just a constant number of iteration as in blk_core is fine |
|---|
| 599 | SELECT CASE ( nn_isfblk ) |
|---|
| 600 | CASE ( 1 ) ! ISOMIP formulation (2 equations) for volume flux (Hunter et al., 2006) |
|---|
| 601 | ! Calculate freezing temperature |
|---|
| 602 | CALL eos_fzp( stbl(:,:), zfrz(:,:), risfdep(:,:) ) |
|---|
| 603 | |
|---|
| 604 | ! compute gammat every where (2d) |
|---|
| 605 | CALL sbc_isf_gammats(zgammat, zgammas, zhtflx, zfwflx) |
|---|
| 606 | |
|---|
| 607 | ! compute upward heat flux zhtflx and upward water flux zwflx |
|---|
| 608 | DO jj = 1, jpj |
|---|
| 609 | DO ji = 1, jpi |
|---|
| 610 | zhtflx(ji,jj) = zgammat(ji,jj)*rcp*rau0*(ttbl(ji,jj)-zfrz(ji,jj)) |
|---|
| 611 | zfwflx(ji,jj) = - zhtflx(ji,jj)/rLfusisf |
|---|
| 612 | END DO |
|---|
| 613 | END DO |
|---|
| 614 | |
|---|
| 615 | ! Compute heat flux and upward fresh water flux |
|---|
| 616 | qisf (:,:) = - zhtflx(:,:) * (1._wp - tmask(:,:,1)) * ssmask(:,:) |
|---|
| 617 | fwfisf(:,:) = zfwflx(:,:) * (1._wp - tmask(:,:,1)) * ssmask(:,:) |
|---|
| 618 | |
|---|
| 619 | CASE ( 2 ) ! ISOMIP+ formulation (3 equations) for volume flux (Asay-Davis et al., 2015) |
|---|
| 620 | ! compute gammat every where (2d) |
|---|
| 621 | CALL sbc_isf_gammats(zgammat, zgammas, zhtflx, zfwflx) |
|---|
| 622 | |
|---|
| 623 | ! compute upward heat flux zhtflx and upward water flux zwflx |
|---|
| 624 | ! Resolution of a 2d equation from equation 21, 22 and 23 to find Sb (Asay-Davis et al., 2015) |
|---|
| 625 | DO jj = 1, jpj |
|---|
| 626 | DO ji = 1, jpi |
|---|
| 627 | ! compute coeficient to solve the 2nd order equation |
|---|
| 628 | zeps1 = rcp*rau0*zgammat(ji,jj) |
|---|
| 629 | zeps2 = rLfusisf*rau0*zgammas(ji,jj) |
|---|
| 630 | zeps3 = rhoisf*rcpisf*rkappa/MAX(risfdep(ji,jj),zeps) |
|---|
| 631 | zeps4 = zlamb2+zlamb3*risfdep(ji,jj) |
|---|
| 632 | zeps6 = zeps4-ttbl(ji,jj) |
|---|
| 633 | zeps7 = zeps4-tsurf |
|---|
| 634 | zaqe = zlamb1 * (zeps1 + zeps3) |
|---|
| 635 | zaqer = 0.5_wp/MIN(zaqe,-zeps) |
|---|
| 636 | zbqe = zeps1*zeps6+zeps3*zeps7-zeps2 |
|---|
| 637 | zcqe = zeps2*stbl(ji,jj) |
|---|
| 638 | zdis = zbqe*zbqe-4.0_wp*zaqe*zcqe |
|---|
| 639 | |
|---|
| 640 | ! Presumably zdis can never be negative because gammas is very small compared to gammat |
|---|
| 641 | ! compute s freeze |
|---|
| 642 | zsfrz=(-zbqe-SQRT(zdis))*zaqer |
|---|
| 643 | IF ( zsfrz < 0.0_wp ) zsfrz=(-zbqe+SQRT(zdis))*zaqer |
|---|
| 644 | |
|---|
| 645 | ! compute t freeze (eq. 22) |
|---|
| 646 | zfrz(ji,jj)=zeps4+zlamb1*zsfrz |
|---|
| 647 | |
|---|
| 648 | ! zfwflx is upward water flux |
|---|
| 649 | ! zhtflx is upward heat flux (out of ocean) |
|---|
| 650 | ! compute the upward water and heat flux (eq. 28 and eq. 29) |
|---|
| 651 | zfwflx(ji,jj) = rau0 * zgammas(ji,jj) * (zsfrz-stbl(ji,jj)) / MAX(zsfrz,zeps) |
|---|
| 652 | zhtflx(ji,jj) = zgammat(ji,jj) * rau0 * rcp * (ttbl(ji,jj) - zfrz(ji,jj) ) |
|---|
| 653 | END DO |
|---|
| 654 | END DO |
|---|
| 655 | |
|---|
| 656 | ! compute heat and water flux |
|---|
| 657 | qisf (:,:) = - zhtflx(:,:) * (1._wp - tmask(:,:,1)) * ssmask(:,:) |
|---|
| 658 | fwfisf(:,:) = zfwflx(:,:) * (1._wp - tmask(:,:,1)) * ssmask(:,:) |
|---|
| 659 | |
|---|
| 660 | END SELECT |
|---|
| 661 | |
|---|
| 662 | ! define if we need to iterate (nn_gammablk 0/1 do not need iteration) |
|---|
| 663 | IF ( nn_gammablk < 2 ) THEN ; lit = .FALSE. |
|---|
| 664 | ELSE |
|---|
| 665 | ! check total number of iteration |
|---|
| 666 | IF (nit >= 100) THEN ; CALL ctl_stop( 'STOP', 'sbc_isf_hol99 : too many iteration ...' ) |
|---|
| 667 | ELSE ; nit = nit + 1 |
|---|
| 668 | END IF |
|---|
| 669 | |
|---|
| 670 | ! compute error between 2 iterations |
|---|
| 671 | ! if needed save gammat and compute zhtflx_b for next iteration |
|---|
| 672 | zerr = MAXVAL(ABS(zhtflx-zhtflx_b)) |
|---|
| 673 | IF ( zerr <= 0.01_wp ) THEN ; lit = .FALSE. |
|---|
| 674 | ELSE ; zhtflx_b(:,:) = zhtflx(:,:) |
|---|
| 675 | END IF |
|---|
| 676 | END IF |
|---|
| 677 | END DO |
|---|
| 678 | ! |
|---|
| 679 | CALL iom_put('isfgammat', zgammat) |
|---|
| 680 | CALL iom_put('isfgammas', zgammas) |
|---|
| 681 | ! |
|---|
| 682 | END SUBROUTINE sbc_isf_cav |
|---|
| 683 | |
|---|
| 684 | |
|---|
| 685 | SUBROUTINE sbc_isf_gammats(pgt, pgs, pqhisf, pqwisf ) |
|---|
| 686 | !!---------------------------------------------------------------------- |
|---|
| 687 | !! ** Purpose : compute the coefficient echange for heat flux |
|---|
| 688 | !! |
|---|
| 689 | !! ** Method : gamma assume constant or depends of u* and stability |
|---|
| 690 | !! |
|---|
| 691 | !! ** References : Holland and Jenkins, 1999, JPO, p1787-1800, eq 14 |
|---|
| 692 | !! Jenkins et al., 2010, JPO, p2298-2312 |
|---|
| 693 | !!--------------------------------------------------------------------- |
|---|
| 694 | REAL(wp), DIMENSION(:,:), INTENT( out) :: pgt , pgs ! |
|---|
| 695 | REAL(wp), DIMENSION(:,:), INTENT(in ) :: pqhisf, pqwisf ! |
|---|
| 696 | ! |
|---|
| 697 | INTEGER :: ji, jj ! loop index |
|---|
| 698 | INTEGER :: ikt ! local integer |
|---|
| 699 | REAL(wp) :: zdku, zdkv ! U, V shear |
|---|
| 700 | REAL(wp) :: zPr, zSc, zRc ! Prandtl, Scmidth and Richardson number |
|---|
| 701 | REAL(wp) :: zmob, zmols ! Monin Obukov length, coriolis factor at T point |
|---|
| 702 | REAL(wp) :: zbuofdep, zhnu ! Bouyancy length scale, sublayer tickness |
|---|
| 703 | REAL(wp) :: zhmax ! limitation of mol |
|---|
| 704 | REAL(wp) :: zetastar ! stability parameter |
|---|
| 705 | REAL(wp) :: zgmolet, zgmoles, zgturb ! contribution of modelecular sublayer and turbulence |
|---|
| 706 | REAL(wp) :: zcoef ! temporary coef |
|---|
| 707 | REAL(wp) :: zdep |
|---|
| 708 | REAL(wp) :: zeps = 1.0e-20_wp |
|---|
| 709 | REAL(wp), PARAMETER :: zxsiN = 0.052_wp ! dimensionless constant |
|---|
| 710 | REAL(wp), PARAMETER :: znu = 1.95e-6_wp ! kinamatic viscosity of sea water (m2.s-1) |
|---|
| 711 | REAL(wp), DIMENSION(2) :: zts, zab |
|---|
| 712 | REAL(wp), DIMENSION(jpi,jpj) :: zustar ! U, V at T point and friction velocity |
|---|
| 713 | !!--------------------------------------------------------------------- |
|---|
| 714 | ! |
|---|
| 715 | SELECT CASE ( nn_gammablk ) |
|---|
| 716 | CASE ( 0 ) ! gamma is constant (specified in namelist) |
|---|
| 717 | !! ISOMIP formulation (Hunter et al, 2006) |
|---|
| 718 | pgt(:,:) = rn_gammat0 |
|---|
| 719 | pgs(:,:) = rn_gammas0 |
|---|
| 720 | |
|---|
| 721 | CASE ( 1 ) ! gamma is assume to be proportional to u* |
|---|
| 722 | !! Jenkins et al., 2010, JPO, p2298-2312 |
|---|
| 723 | !! Adopted by Asay-Davis et al. (2015) |
|---|
| 724 | !! compute ustar (eq. 24) |
|---|
| 725 | !!gm NB use pCdU here so that it will incorporate local boost of Cd0 and log layer case : |
|---|
| 726 | !! zustar(:,:) = SQRT( rCdU_top(:,:) * SQRT(utbl(:,:) * utbl(:,:) + vtbl(:,:) * vtbl(:,:) + r_ke0_top) ) |
|---|
| 727 | !! or better : compute ustar in zdfdrg and use it here as well as in TKE, GLS and Co |
|---|
| 728 | !! |
|---|
| 729 | !! ===>>>> GM to be done this chrismas |
|---|
| 730 | !! |
|---|
| 731 | !!gm end |
|---|
| 732 | zustar(:,:) = SQRT( r_Cdmin_top * (utbl(:,:) * utbl(:,:) + vtbl(:,:) * vtbl(:,:) + r_ke0_top) ) |
|---|
| 733 | |
|---|
| 734 | !! Compute gammats |
|---|
| 735 | pgt(:,:) = zustar(:,:) * rn_gammat0 |
|---|
| 736 | pgs(:,:) = zustar(:,:) * rn_gammas0 |
|---|
| 737 | |
|---|
| 738 | CASE ( 2 ) ! gamma depends of stability of boundary layer |
|---|
| 739 | !! Holland and Jenkins, 1999, JPO, p1787-1800, eq 14 |
|---|
| 740 | !! as MOL depends of flux and flux depends of MOL, best will be iteration (TO DO) |
|---|
| 741 | !! compute ustar |
|---|
| 742 | zustar(:,:) = SQRT( r_Cdmin_top * (utbl(:,:) * utbl(:,:) + vtbl(:,:) * vtbl(:,:) + r_ke0_top) ) |
|---|
| 743 | |
|---|
| 744 | !! compute Pr and Sc number (can be improved) |
|---|
| 745 | zPr = 13.8_wp |
|---|
| 746 | zSc = 2432.0_wp |
|---|
| 747 | |
|---|
| 748 | !! compute gamma mole |
|---|
| 749 | zgmolet = 12.5_wp * zPr ** (2.0/3.0) - 6.0_wp |
|---|
| 750 | zgmoles = 12.5_wp * zSc ** (2.0/3.0) - 6.0_wp |
|---|
| 751 | |
|---|
| 752 | !! compute gamma |
|---|
| 753 | DO ji = 2, jpi |
|---|
| 754 | DO jj = 2, jpj |
|---|
| 755 | ikt = mikt(ji,jj) |
|---|
| 756 | |
|---|
| 757 | IF( zustar(ji,jj) == 0._wp ) THEN ! only for kt = 1 I think |
|---|
| 758 | pgt = rn_gammat0 |
|---|
| 759 | pgs = rn_gammas0 |
|---|
| 760 | ELSE |
|---|
| 761 | !! compute Rc number (as done in zdfric.F90) |
|---|
| 762 | !!gm better to do it like in the new zdfric.F90 i.e. avm weighted Ri computation |
|---|
| 763 | !!gm moreover, use Max(rn2,0) to take care of static instabilities.... |
|---|
| 764 | zcoef = 0.5_wp / e3w_n(ji,jj,ikt+1) |
|---|
| 765 | ! ! shear of horizontal velocity |
|---|
| 766 | zdku = zcoef * ( un(ji-1,jj ,ikt ) + un(ji,jj,ikt ) & |
|---|
| 767 | & -un(ji-1,jj ,ikt+1) - un(ji,jj,ikt+1) ) |
|---|
| 768 | zdkv = zcoef * ( vn(ji ,jj-1,ikt ) + vn(ji,jj,ikt ) & |
|---|
| 769 | & -vn(ji ,jj-1,ikt+1) - vn(ji,jj,ikt+1) ) |
|---|
| 770 | ! ! richardson number (minimum value set to zero) |
|---|
| 771 | zRc = rn2(ji,jj,ikt+1) / MAX( zdku*zdku + zdkv*zdkv, zeps ) |
|---|
| 772 | |
|---|
| 773 | !! compute bouyancy |
|---|
| 774 | zts(jp_tem) = ttbl(ji,jj) |
|---|
| 775 | zts(jp_sal) = stbl(ji,jj) |
|---|
| 776 | zdep = gdepw_n(ji,jj,ikt) |
|---|
| 777 | ! |
|---|
| 778 | CALL eos_rab( zts, zdep, zab ) |
|---|
| 779 | ! |
|---|
| 780 | !! compute length scale |
|---|
| 781 | zbuofdep = grav * ( zab(jp_tem) * pqhisf(ji,jj) - zab(jp_sal) * pqwisf(ji,jj) ) !!!!!!!!!!!!!!!!!!!!!!!!!!!! |
|---|
| 782 | |
|---|
| 783 | !! compute Monin Obukov Length |
|---|
| 784 | ! Maximum boundary layer depth |
|---|
| 785 | zhmax = gdept_n(ji,jj,mbkt(ji,jj)) - gdepw_n(ji,jj,mikt(ji,jj)) -0.001_wp |
|---|
| 786 | ! Compute Monin obukhov length scale at the surface and Ekman depth: |
|---|
| 787 | zmob = zustar(ji,jj) ** 3 / (vkarmn * (zbuofdep + zeps)) |
|---|
| 788 | zmols = SIGN(1._wp, zmob) * MIN(ABS(zmob), zhmax) * tmask(ji,jj,ikt) |
|---|
| 789 | |
|---|
| 790 | !! compute eta* (stability parameter) |
|---|
| 791 | zetastar = 1._wp / ( SQRT(1._wp + MAX(zxsiN * zustar(ji,jj) / ( ABS(ff_f(ji,jj)) * zmols * zRc ), 0._wp))) |
|---|
| 792 | |
|---|
| 793 | !! compute the sublayer thickness |
|---|
| 794 | zhnu = 5 * znu / zustar(ji,jj) |
|---|
| 795 | |
|---|
| 796 | !! compute gamma turb |
|---|
| 797 | zgturb = 1._wp / vkarmn * LOG(zustar(ji,jj) * zxsiN * zetastar * zetastar / ( ABS(ff_f(ji,jj)) * zhnu )) & |
|---|
| 798 | & + 1._wp / ( 2 * zxsiN * zetastar ) - 1._wp / vkarmn |
|---|
| 799 | |
|---|
| 800 | !! compute gammats |
|---|
| 801 | pgt(ji,jj) = zustar(ji,jj) / (zgturb + zgmolet) |
|---|
| 802 | pgs(ji,jj) = zustar(ji,jj) / (zgturb + zgmoles) |
|---|
| 803 | END IF |
|---|
| 804 | END DO |
|---|
| 805 | END DO |
|---|
| 806 | CALL lbc_lnk_multi( 'sbcisf', pgt, 'T', 1., pgs, 'T', 1.) |
|---|
| 807 | END SELECT |
|---|
| 808 | ! |
|---|
| 809 | END SUBROUTINE sbc_isf_gammats |
|---|
| 810 | |
|---|
| 811 | |
|---|
| 812 | SUBROUTINE sbc_isf_tbl( pvarin, pvarout, cd_ptin ) |
|---|
| 813 | !!---------------------------------------------------------------------- |
|---|
| 814 | !! *** SUBROUTINE sbc_isf_tbl *** |
|---|
| 815 | !! |
|---|
| 816 | !! ** Purpose : compute mean T/S/U/V in the boundary layer at T- point |
|---|
| 817 | !! |
|---|
| 818 | !!---------------------------------------------------------------------- |
|---|
| 819 | REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: pvarin |
|---|
| 820 | REAL(wp), DIMENSION(:,:) , INTENT( out) :: pvarout |
|---|
| 821 | CHARACTER(len=1), INTENT(in ) :: cd_ptin ! point of variable in/out |
|---|
| 822 | ! |
|---|
| 823 | INTEGER :: ji, jj, jk ! loop index |
|---|
| 824 | INTEGER :: ikt, ikb ! top and bottom index of the tbl |
|---|
| 825 | REAL(wp) :: ze3, zhk |
|---|
| 826 | REAL(wp), DIMENSION(jpi,jpj) :: zhisf_tbl ! thickness of the tbl |
|---|
| 827 | !!---------------------------------------------------------------------- |
|---|
| 828 | |
|---|
| 829 | ! initialisation |
|---|
| 830 | pvarout(:,:)=0._wp |
|---|
| 831 | |
|---|
| 832 | SELECT CASE ( cd_ptin ) |
|---|
| 833 | CASE ( 'U' ) ! compute U in the top boundary layer at T- point |
|---|
| 834 | DO jj = 1,jpj |
|---|
| 835 | DO ji = 1,jpi |
|---|
| 836 | ikt = miku(ji,jj) ; ikb = miku(ji,jj) |
|---|
| 837 | ! thickness of boundary layer at least the top level thickness |
|---|
| 838 | zhisf_tbl(ji,jj) = MAX( rhisf_tbl_0(ji,jj) , e3u_n(ji,jj,ikt) ) |
|---|
| 839 | |
|---|
| 840 | ! determine the deepest level influenced by the boundary layer |
|---|
| 841 | DO jk = ikt+1, mbku(ji,jj) |
|---|
| 842 | IF ( (SUM(e3u_n(ji,jj,ikt:jk-1)) < zhisf_tbl(ji,jj)) .AND. (umask(ji,jj,jk) == 1) ) ikb = jk |
|---|
| 843 | END DO |
|---|
| 844 | zhisf_tbl(ji,jj) = MIN(zhisf_tbl(ji,jj), SUM(e3u_n(ji,jj,ikt:ikb))) ! limit the tbl to water thickness. |
|---|
| 845 | |
|---|
| 846 | ! level fully include in the ice shelf boundary layer |
|---|
| 847 | DO jk = ikt, ikb - 1 |
|---|
| 848 | ze3 = e3u_n(ji,jj,jk) |
|---|
| 849 | pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,jk) / zhisf_tbl(ji,jj) * ze3 |
|---|
| 850 | END DO |
|---|
| 851 | |
|---|
| 852 | ! level partially include in ice shelf boundary layer |
|---|
| 853 | zhk = SUM( e3u_n(ji, jj, ikt:ikb - 1)) / zhisf_tbl(ji,jj) |
|---|
| 854 | pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,ikb) * (1._wp - zhk) |
|---|
| 855 | END DO |
|---|
| 856 | END DO |
|---|
| 857 | DO jj = 2, jpj |
|---|
| 858 | DO ji = 2, jpi |
|---|
| 859 | !!gm a wet-point only average should be used here !!! |
|---|
| 860 | pvarout(ji,jj) = 0.5_wp * (pvarout(ji,jj) + pvarout(ji-1,jj)) |
|---|
| 861 | END DO |
|---|
| 862 | END DO |
|---|
| 863 | CALL lbc_lnk('sbcisf', pvarout,'T',-1.) |
|---|
| 864 | |
|---|
| 865 | CASE ( 'V' ) ! compute V in the top boundary layer at T- point |
|---|
| 866 | DO jj = 1,jpj |
|---|
| 867 | DO ji = 1,jpi |
|---|
| 868 | ikt = mikv(ji,jj) ; ikb = mikv(ji,jj) |
|---|
| 869 | ! thickness of boundary layer at least the top level thickness |
|---|
| 870 | zhisf_tbl(ji,jj) = MAX(rhisf_tbl_0(ji,jj), e3v_n(ji,jj,ikt)) |
|---|
| 871 | |
|---|
| 872 | ! determine the deepest level influenced by the boundary layer |
|---|
| 873 | DO jk = ikt+1, mbkv(ji,jj) |
|---|
| 874 | IF ( (SUM(e3v_n(ji,jj,ikt:jk-1)) < zhisf_tbl(ji,jj)) .AND. (vmask(ji,jj,jk) == 1) ) ikb = jk |
|---|
| 875 | END DO |
|---|
| 876 | zhisf_tbl(ji,jj) = MIN(zhisf_tbl(ji,jj), SUM(e3v_n(ji,jj,ikt:ikb))) ! limit the tbl to water thickness. |
|---|
| 877 | |
|---|
| 878 | ! level fully include in the ice shelf boundary layer |
|---|
| 879 | DO jk = ikt, ikb - 1 |
|---|
| 880 | ze3 = e3v_n(ji,jj,jk) |
|---|
| 881 | pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,jk) / zhisf_tbl(ji,jj) * ze3 |
|---|
| 882 | END DO |
|---|
| 883 | |
|---|
| 884 | ! level partially include in ice shelf boundary layer |
|---|
| 885 | zhk = SUM( e3v_n(ji, jj, ikt:ikb - 1)) / zhisf_tbl(ji,jj) |
|---|
| 886 | pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,ikb) * (1._wp - zhk) |
|---|
| 887 | END DO |
|---|
| 888 | END DO |
|---|
| 889 | DO jj = 2, jpj |
|---|
| 890 | DO ji = 2, jpi |
|---|
| 891 | !!gm a wet-point only average should be used here !!! |
|---|
| 892 | pvarout(ji,jj) = 0.5_wp * (pvarout(ji,jj) + pvarout(ji,jj-1)) |
|---|
| 893 | END DO |
|---|
| 894 | END DO |
|---|
| 895 | CALL lbc_lnk('sbcisf', pvarout,'T',-1.) |
|---|
| 896 | |
|---|
| 897 | CASE ( 'T' ) ! compute T in the top boundary layer at T- point |
|---|
| 898 | DO jj = 1,jpj |
|---|
| 899 | DO ji = 1,jpi |
|---|
| 900 | ikt = misfkt(ji,jj) |
|---|
| 901 | ikb = misfkb(ji,jj) |
|---|
| 902 | |
|---|
| 903 | ! level fully include in the ice shelf boundary layer |
|---|
| 904 | DO jk = ikt, ikb - 1 |
|---|
| 905 | ze3 = e3t_n(ji,jj,jk) |
|---|
| 906 | pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,jk) * r1_hisf_tbl(ji,jj) * ze3 |
|---|
| 907 | END DO |
|---|
| 908 | |
|---|
| 909 | ! level partially include in ice shelf boundary layer |
|---|
| 910 | zhk = SUM( e3t_n(ji, jj, ikt:ikb - 1)) * r1_hisf_tbl(ji,jj) |
|---|
| 911 | pvarout(ji,jj) = pvarout(ji,jj) + pvarin(ji,jj,ikb) * (1._wp - zhk) |
|---|
| 912 | END DO |
|---|
| 913 | END DO |
|---|
| 914 | END SELECT |
|---|
| 915 | ! |
|---|
| 916 | ! mask mean tbl value |
|---|
| 917 | pvarout(:,:) = pvarout(:,:) * ssmask(:,:) |
|---|
| 918 | ! |
|---|
| 919 | END SUBROUTINE sbc_isf_tbl |
|---|
| 920 | |
|---|
| 921 | |
|---|
| 922 | SUBROUTINE sbc_isf_div( phdivn ) |
|---|
| 923 | !!---------------------------------------------------------------------- |
|---|
| 924 | !! *** SUBROUTINE sbc_isf_div *** |
|---|
| 925 | !! |
|---|
| 926 | !! ** Purpose : update the horizontal divergence with the runoff inflow |
|---|
| 927 | !! |
|---|
| 928 | !! ** Method : |
|---|
| 929 | !! CAUTION : risf_tsc(:,:,jp_sal) is negative (outflow) increase the |
|---|
| 930 | !! divergence and expressed in m/s |
|---|
| 931 | !! |
|---|
| 932 | !! ** Action : phdivn decreased by the runoff inflow |
|---|
| 933 | !!---------------------------------------------------------------------- |
|---|
| 934 | REAL(wp), DIMENSION(:,:,:), INTENT( inout ) :: phdivn ! horizontal divergence |
|---|
| 935 | ! |
|---|
| 936 | INTEGER :: ji, jj, jk ! dummy loop indices |
|---|
| 937 | INTEGER :: ikt, ikb |
|---|
| 938 | REAL(wp) :: zhk |
|---|
| 939 | REAL(wp) :: zfact ! local scalar |
|---|
| 940 | !!---------------------------------------------------------------------- |
|---|
| 941 | ! |
|---|
| 942 | zfact = 0.5_wp |
|---|
| 943 | ! |
|---|
| 944 | IF(.NOT.ln_linssh ) THEN ! need to re compute level distribution of isf fresh water |
|---|
| 945 | DO jj = 1,jpj |
|---|
| 946 | DO ji = 1,jpi |
|---|
| 947 | ikt = misfkt(ji,jj) |
|---|
| 948 | ikb = misfkt(ji,jj) |
|---|
| 949 | ! thickness of boundary layer at least the top level thickness |
|---|
| 950 | rhisf_tbl(ji,jj) = MAX(rhisf_tbl_0(ji,jj), e3t_n(ji,jj,ikt)) |
|---|
| 951 | |
|---|
| 952 | ! determine the deepest level influenced by the boundary layer |
|---|
| 953 | DO jk = ikt, mbkt(ji,jj) |
|---|
| 954 | IF ( (SUM(e3t_n(ji,jj,ikt:jk-1)) .LT. rhisf_tbl(ji,jj)) .AND. (tmask(ji,jj,jk) == 1) ) ikb = jk |
|---|
| 955 | END DO |
|---|
| 956 | rhisf_tbl(ji,jj) = MIN(rhisf_tbl(ji,jj), SUM(e3t_n(ji,jj,ikt:ikb))) ! limit the tbl to water thickness. |
|---|
| 957 | misfkb(ji,jj) = ikb ! last wet level of the tbl |
|---|
| 958 | r1_hisf_tbl(ji,jj) = 1._wp / rhisf_tbl(ji,jj) |
|---|
| 959 | |
|---|
| 960 | 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 |
|---|
| 961 | ralpha(ji,jj) = rhisf_tbl(ji,jj) * (1._wp - zhk ) / e3t_n(ji,jj,ikb) ! proportion of bottom cell influenced by boundary layer |
|---|
| 962 | END DO |
|---|
| 963 | END DO |
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| 964 | END IF |
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| 965 | ! |
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| 966 | !== ice shelf melting distributed over several levels ==! |
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| 967 | DO jj = 1,jpj |
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| 968 | DO ji = 1,jpi |
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| 969 | ikt = misfkt(ji,jj) |
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| 970 | ikb = misfkb(ji,jj) |
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| 971 | ! level fully include in the ice shelf boundary layer |
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| 972 | DO jk = ikt, ikb - 1 |
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| 973 | phdivn(ji,jj,jk) = phdivn(ji,jj,jk) + ( fwfisf(ji,jj) + fwfisf_b(ji,jj) ) & |
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| 974 | & * r1_hisf_tbl(ji,jj) * r1_rau0 * zfact |
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| 975 | END DO |
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| 976 | ! level partially include in ice shelf boundary layer |
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| 977 | phdivn(ji,jj,ikb) = phdivn(ji,jj,ikb) + ( fwfisf(ji,jj) & |
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| 978 | & + fwfisf_b(ji,jj) ) * r1_hisf_tbl(ji,jj) * r1_rau0 * zfact * ralpha(ji,jj) |
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| 979 | END DO |
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| 980 | END DO |
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| 981 | ! |
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| 982 | END SUBROUTINE sbc_isf_div |
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| 983 | |
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| 984 | !!====================================================================== |
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| 985 | END MODULE sbcisf |
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