[11395] | 1 | MODULE isfcavmlt |
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| 2 | !!====================================================================== |
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[11541] | 3 | !! *** MODULE isfcavmlt *** |
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[11395] | 4 | !! ice shelf module : update surface ocean boundary condition under ice |
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[11931] | 5 | !! shelves |
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[11395] | 6 | !!====================================================================== |
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| 7 | !! History : 4.0 ! 2019-09 (P. Mathiot) Original code |
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| 8 | !!---------------------------------------------------------------------- |
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| 9 | |
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| 10 | !!---------------------------------------------------------------------- |
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[11931] | 11 | !! isfcav_mlt : compute or read ice shelf fwf/heat fluxes in the ice shelf cavity |
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[11395] | 12 | !!---------------------------------------------------------------------- |
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| 13 | |
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[12077] | 14 | USE isf_oce ! ice shelf |
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[11852] | 15 | USE isftbl , ONLY: isf_tbl ! ice shelf depth average |
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| 16 | USE isfutils,ONLY: debug ! debug subroutine |
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| 17 | |
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| 18 | USE dom_oce ! ocean space and time domain |
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[12489] | 19 | USE phycst , ONLY: rcp, rho0, rho0_rcp ! physical constants |
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[11852] | 20 | USE eosbn2 , ONLY: eos_fzp ! equation of state |
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| 21 | |
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| 22 | USE in_out_manager ! I/O manager |
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| 23 | USE iom , ONLY: iom_put ! I/O library |
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[11931] | 24 | USE fldread , ONLY: fld_read, FLD, FLD_N ! |
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[11852] | 25 | USE lib_fortran, ONLY: glob_sum ! |
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| 26 | USE lib_mpp , ONLY: ctl_stop ! |
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| 27 | |
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[11395] | 28 | IMPLICIT NONE |
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| 29 | PRIVATE |
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| 30 | |
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| 31 | PUBLIC isfcav_mlt |
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| 32 | |
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[12340] | 33 | !! * Substitutions |
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| 34 | # include "do_loop_substitute.h90" |
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[11395] | 35 | !!---------------------------------------------------------------------- |
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| 36 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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| 37 | !! $Id: sbcisf.F90 10536 2019-01-16 19:21:09Z mathiot $ |
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| 38 | !! Software governed by the CeCILL license (see ./LICENSE) |
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| 39 | !!---------------------------------------------------------------------- |
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| 40 | CONTAINS |
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| 41 | |
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| 42 | ! ------------------------------------------------------------------------------------------------------- |
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| 43 | ! -------------------------------- PUBLIC SUBROUTINE ---------------------------------------------------- |
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| 44 | ! ------------------------------------------------------------------------------------------------------- |
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| 45 | |
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[11403] | 46 | SUBROUTINE isfcav_mlt(kt, pgt, pgs , pttbl, pstbl, & |
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| 47 | & pqhc, pqoce, pqfwf ) |
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[11395] | 48 | !!---------------------------------------------------------------------- |
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| 49 | !! |
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[11541] | 50 | !! *** ROUTINE isfcav_mlt *** |
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| 51 | !! |
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[11494] | 52 | !! ** Purpose : compute or read ice shelf fwf/heat fluxes in the ice shelf cavity |
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[11403] | 53 | !! |
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[11395] | 54 | !!-------------------------- OUT ------------------------------------- |
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[11403] | 55 | REAL(wp), DIMENSION(jpi,jpj), INTENT( out) :: pqhc, pqoce, pqfwf ! heat and fwf fluxes |
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[11395] | 56 | !!-------------------------- IN ------------------------------------- |
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| 57 | INTEGER, INTENT(in) :: kt |
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| 58 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pgt , pgs ! gamma t and gamma s |
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| 59 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pttbl, pstbl ! top boundary layer tracer |
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| 60 | !!--------------------------------------------------------------------- |
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| 61 | ! |
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| 62 | ! compute latent heat and melt (2d) |
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| 63 | SELECT CASE ( cn_isfcav_mlt ) |
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| 64 | CASE ( 'spe' ) ! ice shelf melt specified (read input file, and heat fluxes derived from |
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[11425] | 65 | CALL isfcav_mlt_spe( kt, pstbl, & |
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[11403] | 66 | & pqhc, pqoce, pqfwf ) |
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[11395] | 67 | CASE ( '2eq' ) ! ISOMIP formulation (2 equations) for volume flux (Hunter et al., 2006) |
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[11425] | 68 | CALL isfcav_mlt_2eq( pgt, pttbl, pstbl, & |
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[11403] | 69 | & pqhc , pqoce, pqfwf ) |
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[11395] | 70 | CASE ( '3eq' ) ! ISOMIP+ formulation (3 equations) for volume flux (Asay-Davis et al., 2015) |
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[11425] | 71 | CALL isfcav_mlt_3eq( pgt, pgs , pttbl, pstbl, & |
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[11403] | 72 | & pqhc, pqoce, pqfwf ) |
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[11395] | 73 | CASE ( 'oasis' ) ! fwf pass trough oasis |
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[11425] | 74 | CALL isfcav_mlt_oasis( kt, pstbl, & |
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[11403] | 75 | & pqhc, pqoce, pqfwf ) |
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[11395] | 76 | CASE DEFAULT |
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| 77 | CALL ctl_stop('STOP', 'unknown isf melt formulation : cn_isfcav (should not see this)') |
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| 78 | END SELECT |
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| 79 | ! |
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[11844] | 80 | IF (ln_isfdebug) THEN |
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[12077] | 81 | CALL debug( 'isfcav_mlt qhc :', pqhc (:,:) ) |
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| 82 | CALL debug( 'isfcav_mlt qoce :', pqoce(:,:) ) |
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| 83 | CALL debug( 'isfcav_mlt qfwf :', pqfwf(:,:) ) |
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[11844] | 84 | END IF |
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| 85 | ! |
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[11395] | 86 | END SUBROUTINE isfcav_mlt |
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| 87 | |
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| 88 | ! ------------------------------------------------------------------------------------------------------- |
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| 89 | ! -------------------------------- PRIVATE SUBROUTINE --------------------------------------------------- |
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| 90 | ! ------------------------------------------------------------------------------------------------------- |
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| 91 | |
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[11541] | 92 | SUBROUTINE isfcav_mlt_spe(kt, pstbl, & ! <<== in |
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[11403] | 93 | & pqhc , pqoce, pqfwf ) ! ==>> out |
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[11395] | 94 | !!---------------------------------------------------------------------- |
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[11541] | 95 | !! |
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| 96 | !! *** ROUTINE isfcav_mlt_spe *** |
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| 97 | !! |
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[11403] | 98 | !! ** Purpose : - read ice shelf melt from forcing file |
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| 99 | !! - compute ocea-ice heat flux (assuming it is equal to latent heat) |
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| 100 | !! - compute heat content flux |
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[11395] | 101 | !!--------------------------------------------------------------------- |
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| 102 | !!-------------------------- OUT ------------------------------------- |
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[11403] | 103 | REAL(wp), DIMENSION(jpi,jpj), INTENT( out) :: pqhc, pqoce, pqfwf ! heat content, latent heat and fwf fluxes |
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[11395] | 104 | !!-------------------------- IN ------------------------------------- |
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[11403] | 105 | INTEGER , INTENT(in ) :: kt ! current time step |
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| 106 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pstbl ! salinity in tbl |
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[11395] | 107 | !!-------------------------------------------------------------------- |
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[11403] | 108 | REAL(wp), DIMENSION(jpi,jpj) :: ztfrz ! tbl freezing temperature |
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[11395] | 109 | !!-------------------------------------------------------------------- |
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| 110 | ! |
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[11931] | 111 | ! Compute freezing temperature |
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[11395] | 112 | CALL eos_fzp( pstbl(:,:), ztfrz(:,:), risfdep(:,:) ) |
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| 113 | ! |
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| 114 | ! read input file |
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[11852] | 115 | CALL fld_read ( kt, 1, sf_isfcav_fwf ) |
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[11395] | 116 | ! |
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| 117 | ! define fwf and qoce |
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| 118 | ! ocean heat flux is assume to be equal to the latent heat |
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[11403] | 119 | pqfwf(:,:) = - sf_isfcav_fwf(1)%fnow(:,:,1) ! fwf ( >0 out) |
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| 120 | pqoce(:,:) = - pqfwf(:,:) * rLfusisf ! ocean heat flux ( >0 out) |
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| 121 | pqhc (:,:) = pqfwf(:,:) * ztfrz(:,:) * rcp ! heat content flux ( >0 out) |
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[11395] | 122 | ! |
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[11876] | 123 | ! output freezing point at the interface |
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| 124 | CALL iom_put('isftfrz_cav', ztfrz ) |
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| 125 | ! |
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[11425] | 126 | END SUBROUTINE isfcav_mlt_spe |
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[11395] | 127 | |
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[11541] | 128 | SUBROUTINE isfcav_mlt_2eq(pgt , pttbl, pstbl, & ! <<== in |
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| 129 | & pqhc, pqoce, pqfwf ) ! ==>> out |
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[11395] | 130 | !!---------------------------------------------------------------------- |
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[11541] | 131 | !! |
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[11931] | 132 | !! *** ROUTINE isfcav_mlt_2eq *** |
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[11541] | 133 | !! |
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[11403] | 134 | !! ** Purpose : Compute ice shelf fwf/heqt fluxes using ISOMIP formulation (Hunter et al., 2006) |
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[11395] | 135 | !! |
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[11403] | 136 | !! ** Method : The ice shelf melt latent heat is defined as being equal to the ocean/ice heat flux. |
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| 137 | !! From this we can derived the fwf, ocean/ice heat flux and the heat content flux as being : |
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[13472] | 138 | !! qfwf = Gammat * rho0 * Cp * ( Tw - Tfrz ) / Lf |
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[11403] | 139 | !! qhoce = qlat |
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| 140 | !! qhc = qfwf * Cp * Tfrz |
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| 141 | !! |
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| 142 | !! ** Reference : Hunter, J. R.: Specification for test models of ice shelf cavities, |
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| 143 | !! Tech. Rep. June, Antarctic Climate & Ecosystems Cooperative Research Centre, available at: |
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| 144 | !! http://staff.acecrc.org.au/~bkgalton/ISOMIP/test_cavities.pdf (last access: 21 July 2016), 2006. |
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[11931] | 145 | !! |
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[11395] | 146 | !!-------------------------- OUT ------------------------------------- |
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[11403] | 147 | REAL(wp), DIMENSION(jpi,jpj), INTENT( out) :: pqhc, pqoce, pqfwf ! hean content, ocean-ice heat and fwf fluxes |
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[11395] | 148 | !!-------------------------- IN ------------------------------------- |
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| 149 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pgt ! temperature exchange coeficient |
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| 150 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pttbl, pstbl ! temperature and salinity in top boundary layer |
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| 151 | !!-------------------------------------------------------------------- |
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| 152 | REAL(wp), DIMENSION(jpi,jpj) :: ztfrz ! freezing temperature |
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[11403] | 153 | REAL(wp), DIMENSION(jpi,jpj) :: zthd ! thermal driving |
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[11395] | 154 | !!-------------------------------------------------------------------- |
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| 155 | ! |
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| 156 | ! Calculate freezing temperature |
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| 157 | CALL eos_fzp( pstbl(:,:), ztfrz(:,:), risfdep(:,:) ) |
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| 158 | ! |
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[11403] | 159 | ! thermal driving |
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[11488] | 160 | zthd (:,:) = ( pttbl(:,:) - ztfrz(:,:) ) * mskisf_cav(:,:) |
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[11403] | 161 | ! |
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[11395] | 162 | ! compute ocean-ice heat flux and then derive fwf assuming that ocean heat flux equal latent heat |
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[12489] | 163 | pqfwf(:,:) = - pgt(:,:) * rho0_rcp * zthd(:,:) / rLfusisf ! fresh water flux ( > 0 out ) |
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[11403] | 164 | pqoce(:,:) = - pqfwf(:,:) * rLfusisf ! ocea-ice flux ( > 0 out ) |
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| 165 | pqhc (:,:) = pqfwf(:,:) * ztfrz(:,:) * rcp ! heat content flux ( > 0 out ) |
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[11395] | 166 | ! |
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[11876] | 167 | ! output thermal driving and freezinpoint at the ice shelf interface |
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[11403] | 168 | CALL iom_put('isfthermald_cav', zthd ) |
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[11876] | 169 | CALL iom_put('isftfrz_cav' , ztfrz ) |
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[11395] | 170 | ! |
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[11425] | 171 | END SUBROUTINE isfcav_mlt_2eq |
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[11395] | 172 | |
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[11541] | 173 | SUBROUTINE isfcav_mlt_3eq(pgt, pgs , pttbl, pstbl, & ! <<== in |
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| 174 | & pqhc, pqoce, pqfwf ) ! ==>> out |
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[11395] | 175 | !!---------------------------------------------------------------------- |
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[11541] | 176 | !! |
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| 177 | !! *** ROUTINE isfcav_mlt_3eq *** |
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| 178 | !! |
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[11403] | 179 | !! ** Purpose : Compute ice shelf fwf/heqt fluxes using the 3 equation formulation |
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[11395] | 180 | !! |
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[11403] | 181 | !! ** Method : The melt rate is determined considering the heat balance, the salt balance |
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| 182 | !! at the phase change interface and a linearisation of the equation of state. |
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| 183 | !! |
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| 184 | !! ** Reference : - Holland, D. M. and Jenkins, A., |
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| 185 | !! Modeling Thermodynamic Ice-Ocean Interactions at the Base of an Ice Shelf, |
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| 186 | !! J. Phys. Oceanogr., 29, 1999. |
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| 187 | !! - Asay-Davis, X. S., Cornford, S. L., Durand, G., Galton-Fenzi, B. K., Gladstone, |
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| 188 | !! R. M., Gudmundsson, G. H., Hattermann, T., Holland, D. M., Holland, D., Holland, |
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| 189 | !! P. R., Martin, D. F., Mathiot, P., Pattyn, F., and Seroussi, H.: |
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| 190 | !! Experimental design for three interrelated marine ice sheet and ocean model intercomparison projects: |
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| 191 | !! MISMIP v. 3 (MISMIP +), ISOMIP v. 2 (ISOMIP +) and MISOMIP v. 1 (MISOMIP1), |
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| 192 | !! Geosci. Model Dev., 9, 2471-2497, https://doi.org/10.5194/gmd-9-2471-2016, 2016. |
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[11931] | 193 | !! |
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[11395] | 194 | !!-------------------------- OUT ------------------------------------- |
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[11403] | 195 | REAL(wp), DIMENSION(jpi,jpj), INTENT( out) :: pqhc, pqoce, pqfwf ! latent heat and fwf fluxes |
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[11395] | 196 | !!-------------------------- IN ------------------------------------- |
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[11403] | 197 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pgt , pgs ! heat/salt exchange coeficient |
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| 198 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pttbl, pstbl ! mean temperature and salinity in top boundary layer |
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[11395] | 199 | !!-------------------------------------------------------------------- |
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[11403] | 200 | REAL(wp) :: zeps1,zeps2,zeps3,zeps4,zeps6,zeps7 ! dummy local scalar for quadratic equation resolution |
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| 201 | REAL(wp) :: zaqe,zbqe,zcqe,zaqer,zdis,zsfrz,zcfac ! dummy local scalar for quadratic equation resolution |
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[11395] | 202 | REAL(wp) :: zeps = 1.e-20 |
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[11403] | 203 | REAL(wp), DIMENSION(jpi,jpj) :: ztfrz ! freezing point |
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| 204 | REAL(wp), DIMENSION(jpi,jpj) :: zqcon ! conductive flux through the ice shelf |
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| 205 | REAL(wp), DIMENSION(jpi,jpj) :: zthd ! thermal driving |
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[11395] | 206 | ! |
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| 207 | INTEGER :: ji, jj ! dummy loop indices |
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| 208 | !!-------------------------------------------------------------------- |
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| 209 | ! |
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| 210 | ! compute upward heat flux zhtflx and upward water flux zwflx |
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[11403] | 211 | ! Resolution of a 3d equation from equation 24, 25 and 26 (note conduction through the ice has been added to Eq 24) |
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[13295] | 212 | DO_2D( 1, 1, 1, 1 ) |
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[12340] | 213 | ! |
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| 214 | ! compute coeficient to solve the 2nd order equation |
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[12489] | 215 | zeps1 = rho0_rcp * pgt(ji,jj) |
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| 216 | zeps2 = rLfusisf * rho0 * pgs(ji,jj) |
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[12340] | 217 | zeps3 = rhoisf * rcpisf * rkappa / MAX(risfdep(ji,jj),zeps) |
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| 218 | zeps4 = risf_lamb2 + risf_lamb3 * risfdep(ji,jj) |
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| 219 | zeps6 = zeps4 - pttbl(ji,jj) |
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| 220 | zeps7 = zeps4 - rtsurf |
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| 221 | ! |
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| 222 | ! solve the 2nd order equation to find zsfrz |
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| 223 | zaqe = risf_lamb1 * (zeps1 + zeps3) |
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| 224 | zaqer = 0.5_wp / MIN(zaqe,-zeps) |
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| 225 | zbqe = zeps1 * zeps6 + zeps3 * zeps7 - zeps2 |
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| 226 | zcqe = zeps2 * pstbl(ji,jj) |
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| 227 | zdis = zbqe * zbqe - 4.0_wp * zaqe * zcqe |
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| 228 | ! |
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| 229 | ! Presumably zdis can never be negative because gammas is very small compared to gammat |
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| 230 | zsfrz=(-zbqe - SQRT(zdis)) * zaqer |
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| 231 | IF ( zsfrz < 0.0_wp ) zsfrz=(-zbqe + SQRT(zdis)) * zaqer ! check this if this if is needed |
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| 232 | ! |
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| 233 | ! compute t freeze (eq. 25) |
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| 234 | ztfrz(ji,jj) = zeps4 + risf_lamb1 * zsfrz |
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| 235 | ! |
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| 236 | ! thermal driving |
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| 237 | zthd(ji,jj) = ( pttbl(ji,jj) - ztfrz(ji,jj) ) |
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| 238 | ! |
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| 239 | ! compute the upward water and heat flux (eq. 24 and eq. 26) |
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[12489] | 240 | pqfwf(ji,jj) = rho0 * pgs(ji,jj) * ( zsfrz - pstbl(ji,jj) ) / MAX(zsfrz,zeps) ! fresh water flux (> 0 out) |
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| 241 | pqoce(ji,jj) = rho0_rcp * pgt(ji,jj) * zthd (ji,jj) ! ocean-ice heat flux (> 0 out) |
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[12340] | 242 | pqhc (ji,jj) = rcp * pqfwf(ji,jj) * ztfrz(ji,jj) ! heat content flux (> 0 out) |
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| 243 | ! |
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| 244 | zqcon(ji,jj) = zeps3 * ( ztfrz(ji,jj) - rtsurf ) |
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| 245 | ! |
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| 246 | END_2D |
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[11395] | 247 | ! |
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| 248 | ! output conductive heat flux through the ice |
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[11488] | 249 | CALL iom_put('qconisf', zqcon(:,:) * mskisf_cav(:,:) ) |
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[11395] | 250 | ! |
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[11876] | 251 | ! output thermal driving and freezing point at the interface |
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| 252 | CALL iom_put('isfthermald_cav', zthd (:,:) * mskisf_cav(:,:) ) |
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| 253 | CALL iom_put('isftfrz_cav' , ztfrz(:,:) * mskisf_cav(:,:) ) |
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[11395] | 254 | ! |
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[11425] | 255 | END SUBROUTINE isfcav_mlt_3eq |
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[11395] | 256 | |
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[11541] | 257 | SUBROUTINE isfcav_mlt_oasis(kt, pstbl, & ! <<== in |
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[11403] | 258 | & pqhc , pqoce, pqfwf ) ! ==>> out |
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| 259 | !!---------------------------------------------------------------------- |
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[11541] | 260 | !! *** ROUTINE isfcav_mlt_oasis *** |
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[11403] | 261 | !! |
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| 262 | !! ** Purpose : scale the fwf read from input file by the total amount received by the sbccpl interface |
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| 263 | !! |
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| 264 | !! ** Purpose : - read ice shelf melt from forcing file => pattern |
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| 265 | !! - total amount of fwf is given by sbccpl (fwfisf_cpl) |
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| 266 | !! - scale fwf and compute heat fluxes |
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| 267 | !! |
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| 268 | !!--------------------------------------------------------------------- |
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| 269 | !!-------------------------- OUT ------------------------------------- |
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| 270 | REAL(wp), DIMENSION(jpi,jpj), INTENT( out) :: pqhc, pqoce, pqfwf ! heat content, latent heat and fwf fluxes |
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| 271 | !!-------------------------- IN ------------------------------------- |
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| 272 | INTEGER , INTENT(in ) :: kt ! current time step |
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| 273 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pstbl ! salinity in tbl |
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| 274 | !!-------------------------------------------------------------------- |
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[11423] | 275 | REAL(wp) :: zfwf_fld, zfwf_oasis ! total fwf in the forcing fields (pattern) and from the oasis interface (amount) |
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[11403] | 276 | REAL(wp), DIMENSION(jpi,jpj) :: ztfrz ! tbl freezing temperature |
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| 277 | REAL(wp), DIMENSION(jpi,jpj) :: zfwf ! 2d fwf map after scaling |
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| 278 | !!-------------------------------------------------------------------- |
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| 279 | ! |
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| 280 | ! Calculate freezing temperature |
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| 281 | CALL eos_fzp( pstbl(:,:), ztfrz(:,:), risfdep(:,:) ) |
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| 282 | ! |
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| 283 | ! read input file |
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[11852] | 284 | CALL fld_read ( kt, 1, sf_isfcav_fwf ) |
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[11403] | 285 | ! |
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| 286 | ! ice shelf 2d map |
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| 287 | zfwf(:,:) = - sf_isfcav_fwf(1)%fnow(:,:,1) |
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| 288 | ! |
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| 289 | ! compute glob sum from input file |
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[11425] | 290 | ! (PM) should consider delay sum as in fwb (1 time step offset if I well understood) |
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| 291 | zfwf_fld = glob_sum('isfcav_mlt', e1e2t(:,:) * zfwf(:,:)) |
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[11403] | 292 | ! |
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| 293 | ! compute glob sum from atm->oce ice shelf fwf |
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[11425] | 294 | ! (PM) should consider delay sum as in fwb (1 time step offset if I well understood) |
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| 295 | zfwf_oasis = glob_sum('isfcav_mlt', e1e2t(:,:) * fwfisf_oasis(:,:)) |
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[11403] | 296 | ! |
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| 297 | ! scale fwf |
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[11423] | 298 | zfwf(:,:) = zfwf(:,:) * zfwf_oasis / zfwf_fld |
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[11403] | 299 | ! |
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| 300 | ! define fwf and qoce |
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| 301 | ! ocean heat flux is assume to be equal to the latent heat |
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| 302 | pqfwf(:,:) = zfwf(:,:) ! fwf ( >0 out) |
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| 303 | pqoce(:,:) = - pqfwf(:,:) * rLfusisf ! ocean heat flux ( >0 out) |
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| 304 | pqhc (:,:) = pqfwf(:,:) * ztfrz(:,:) * rcp ! heat content flux ( >0 out) |
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| 305 | ! |
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[11876] | 306 | CALL iom_put('isftfrz_cav', ztfrz * mskisf_cav(:,:) ) |
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[11931] | 307 | ! |
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[11425] | 308 | END SUBROUTINE isfcav_mlt_oasis |
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[11403] | 309 | |
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[11395] | 310 | END MODULE isfcavmlt |
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