[11395] | 1 | MODULE isfparmlt |
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| 2 | !!====================================================================== |
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[11403] | 3 | !! *** MODULE isfparmlt *** |
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[11541] | 4 | !! Ice shelf parametrisation module : update surface ocean boundary condition under ice |
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| 5 | !! shelf using an ice shelf melt parametrisation |
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[11395] | 6 | !!====================================================================== |
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| 7 | !! History : 4.0 ! original code |
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| 8 | !!---------------------------------------------------------------------- |
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| 9 | |
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[11541] | 10 | USE isf ! ice shelf |
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[11852] | 11 | USE isftbl , ONLY: isf_tbl ! ice shelf depth average |
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[11395] | 12 | |
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[11852] | 13 | USE dom_oce ! ocean space and time domain |
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| 14 | USE oce , ONLY: tsn ! ocean dynamics and tracers |
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| 15 | USE phycst , ONLY: rcp, rau0 ! physical constants |
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| 16 | USE eosbn2 , ONLY: eos_fzp ! equation of state |
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[11395] | 17 | |
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[11852] | 18 | USE in_out_manager ! I/O manager |
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| 19 | USE iom , ONLY: iom_put ! I/O library |
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| 20 | USE fldread , ONLY: fld_read ! |
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| 21 | USE lib_fortran, ONLY: glob_sum ! |
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| 22 | USE lib_mpp , ONLY: ctl_stop ! |
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| 23 | |
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[11395] | 24 | IMPLICIT NONE |
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| 25 | |
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| 26 | PRIVATE |
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| 27 | |
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| 28 | PUBLIC isfpar_mlt |
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| 29 | |
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| 30 | !!---------------------------------------------------------------------- |
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| 31 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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| 32 | !! $Id: sbcisf.F90 10536 2019-01-16 19:21:09Z mathiot $ |
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| 33 | !! Software governed by the CeCILL license (see ./LICENSE) |
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| 34 | !!---------------------------------------------------------------------- |
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| 35 | CONTAINS |
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| 36 | |
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| 37 | ! ------------------------------------------------------------------------------------------------------- |
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| 38 | ! -------------------------------- PUBLIC SUBROUTINE ---------------------------------------------------- |
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| 39 | ! ------------------------------------------------------------------------------------------------------- |
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| 40 | |
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[11494] | 41 | SUBROUTINE isfpar_mlt( kt, pqhc, pqoce, pqfwf ) |
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[11395] | 42 | !!--------------------------------------------------------------------- |
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[11494] | 43 | !! *** ROUTINE isfpar_mlt *** |
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[11395] | 44 | !! |
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| 45 | !! ** Purpose : Compute Salt and Heat fluxes related to ice_shelf |
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| 46 | !! melting and freezing |
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| 47 | !! |
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[11403] | 48 | !! ** Method : 2 parameterizations are available according |
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| 49 | !! 1 : Specified melt flux |
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[11395] | 50 | !! 2 : Beckmann & Goose parameterization |
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| 51 | !!---------------------------------------------------------------------- |
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| 52 | !!-------------------------- OUT ------------------------------------- |
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[11494] | 53 | REAL(wp), DIMENSION(jpi,jpj), INTENT(inout) :: pqfwf, pqoce, pqhc ! fresh water, ice-ocean heat and heat content fluxes |
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[11395] | 54 | !!-------------------------- IN ------------------------------------- |
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| 55 | INTEGER, INTENT(in) :: kt ! ocean time step |
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| 56 | !!--------------------------------------------------------------------- |
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| 57 | ! |
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| 58 | ! Choose among the available ice shelf parametrisation |
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| 59 | SELECT CASE ( cn_isfpar_mlt ) |
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| 60 | CASE ( 'spe' ) ! specified runoff in depth (Mathiot et al., 2017 in preparation) |
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| 61 | CALL isfpar_mlt_spe(kt, pqhc, pqoce, pqfwf) |
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| 62 | CASE ( 'bg03' ) ! Beckmann and Goosse parametrisation |
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| 63 | CALL isfpar_mlt_bg03(kt, pqhc, pqoce, pqfwf) |
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| 64 | CASE ( 'oasis' ) |
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[11403] | 65 | CALL isfpar_mlt_oasis( kt, pqhc, pqoce, pqfwf) |
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[11395] | 66 | CASE DEFAULT |
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| 67 | CALL ctl_stop('STOP', 'unknown isf melt formulation : cn_isfpar (should not see this)') |
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| 68 | END SELECT |
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| 69 | ! |
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| 70 | END SUBROUTINE isfpar_mlt |
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| 71 | |
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| 72 | ! ------------------------------------------------------------------------------------------------------- |
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| 73 | ! -------------------------------- PRIVATE SUBROUTINE --------------------------------------------------- |
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| 74 | ! ------------------------------------------------------------------------------------------------------- |
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| 75 | |
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[11494] | 76 | SUBROUTINE isfpar_mlt_spe(kt, pqhc, pqoce, pqfwf) |
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[11395] | 77 | !!--------------------------------------------------------------------- |
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[11403] | 78 | !! *** ROUTINE isfpar_mlt_spe *** |
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[11395] | 79 | !! |
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| 80 | !! ** Purpose : prescribed ice shelf melting in case ice shelf cavities are closed. |
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| 81 | !! data read into a forcing files. |
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| 82 | !! |
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| 83 | !!---------------------------------------------------------------------- |
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| 84 | !!-------------------------- OUT ------------------------------------- |
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[11494] | 85 | REAL(wp), DIMENSION(jpi,jpj), INTENT(inout) :: pqhc, pqfwf, pqoce ! fresh water and ice-ocean heat fluxes |
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[11395] | 86 | !!-------------------------- IN ------------------------------------- |
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| 87 | INTEGER, INTENT(in) :: kt |
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| 88 | !!-------------------------------------------------------------------- |
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| 89 | INTEGER :: jk |
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| 90 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: ztfrz3d |
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| 91 | REAL(wp), DIMENSION(jpi,jpj) :: ztfrz |
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| 92 | !!-------------------------------------------------------------------- |
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| 93 | ! |
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[11403] | 94 | ! 0. ------------Read specified runoff |
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[11852] | 95 | CALL fld_read ( kt, 1, sf_isfpar_fwf ) |
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[11395] | 96 | ! |
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| 97 | ! compute ptfrz |
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[11403] | 98 | ! 1. ------------Mean freezing point |
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[11395] | 99 | DO jk = 1,jpk |
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| 100 | CALL eos_fzp(tsn(:,:,jk,jp_sal), ztfrz3d(:,:,jk), gdept_n(:,:,jk)) |
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| 101 | END DO |
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[11495] | 102 | CALL isf_tbl(ztfrz3d, ztfrz, 'T', misfkt_par, rhisf_tbl_par, misfkb_par, rfrac_tbl_par ) |
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[11395] | 103 | ! |
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| 104 | pqfwf(:,:) = - sf_isfpar_fwf(1)%fnow(:,:,1) ! fresh water flux from the isf (fwfisf <0 mean melting) |
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| 105 | pqoce(:,:) = pqfwf(:,:) * rLfusisf ! ocean/ice shelf flux assume to be equal to latent heat flux |
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| 106 | pqhc (:,:) = pqfwf(:,:) * ztfrz(:,:) * rcp ! heat content flux |
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[11876] | 107 | CALL iom_put('isftfrz_par', ztfrz ) |
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[11395] | 108 | ! |
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| 109 | END SUBROUTINE isfpar_mlt_spe |
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| 110 | |
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| 111 | SUBROUTINE isfpar_mlt_bg03(kt, pqhc, pqoce, pqfwf) |
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| 112 | !!--------------------------------------------------------------------- |
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[11403] | 113 | !! *** ROUTINE isfpar_mlt_bg03 *** |
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[11395] | 114 | !! |
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[11403] | 115 | !! ** Purpose : compute an estimate of ice shelf melting and |
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| 116 | !! latent, ocean-ice and heat content heat fluxes |
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| 117 | !! in case cavities are closed based on the far fields T and S properties. |
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[11395] | 118 | !! |
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[11403] | 119 | !! ** Method : The ice shelf melt is computed as proportional to the differences between the |
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| 120 | !! mean temperature and mean freezing point in front of the ice shelf averaged |
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| 121 | !! over the ice shelf min ice shelf draft and max ice shelf draft and the freezing point |
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[11395] | 122 | !! |
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| 123 | !! ** Reference : Beckmann and Goosse (2003), "A parameterization of ice shelf-ocean |
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[11403] | 124 | !! interaction for climate models", Ocean Modelling 5(2003) 157-170. |
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[11395] | 125 | !!---------------------------------------------------------------------- |
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| 126 | !!-------------------------- OUT ------------------------------------- |
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[11494] | 127 | REAL(wp), DIMENSION(jpi,jpj), INTENT(inout) :: pqhc, pqfwf, pqoce ! fresh water and ice-ocean heat fluxes |
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[11395] | 128 | !!-------------------------- IN ------------------------------------- |
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| 129 | INTEGER, INTENT(in) :: kt |
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| 130 | !!-------------------------------------------------------------------- |
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| 131 | INTEGER :: jk |
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| 132 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: ztfrz3d ! freezing point |
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| 133 | REAL(wp), DIMENSION(jpi,jpj) :: ztfrz ! freezing point |
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| 134 | REAL(wp), DIMENSION(jpi,jpj) :: ztavg ! temperature avg |
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| 135 | !!---------------------------------------------------------------------- |
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| 136 | ! |
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| 137 | ! 0. ------------Mean freezing point |
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| 138 | DO jk = 1,jpk |
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| 139 | CALL eos_fzp(tsn(:,:,jk,jp_sal), ztfrz3d(:,:,jk), gdept_n(:,:,jk)) |
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| 140 | END DO |
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[11495] | 141 | CALL isf_tbl(ztfrz3d, ztfrz, 'T', misfkt_par, rhisf_tbl_par, misfkb_par, rfrac_tbl_par ) |
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[11395] | 142 | ! |
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| 143 | ! 1. ------------Mean temperature |
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[11495] | 144 | CALL isf_tbl(tsn(:,:,jk,jp_tem), ztavg, 'T', misfkt_par, rhisf_tbl_par, misfkb_par, rfrac_tbl_par ) |
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[11395] | 145 | ! |
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| 146 | ! 2. ------------Net heat flux and fresh water flux due to the ice shelf |
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[11403] | 147 | pqoce(:,:) = rau0 * rcp * rn_gammat0 * risfLeff(:,:) * e1t(:,:) * ( ztavg(:,:) - ztfrz(:,:) ) * r1_e1e2t(:,:) |
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[11541] | 148 | pqfwf(:,:) = - pqoce(:,:) / rLfusisf ! derived from the latent heat flux |
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[11395] | 149 | pqhc (:,:) = pqfwf(:,:) * ztfrz(:,:) * rcp ! heat content flux |
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| 150 | ! |
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[11403] | 151 | ! 3. ------------BG03 output |
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[11395] | 152 | ! output ttbl |
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[11521] | 153 | CALL iom_put('ttbl_par', ztavg(:,:) * mskisf_par(:,:) ) |
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[11395] | 154 | ! |
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| 155 | ! output thermal driving |
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[11521] | 156 | CALL iom_put('isfthermald_par',( ztfrz(:,:) - ztavg(:,:) ) * mskisf_par(:,:)) |
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[11876] | 157 | CALL iom_put('isftfrz_par', ztfrz ) |
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[11395] | 158 | ! |
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| 159 | END SUBROUTINE isfpar_mlt_bg03 |
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| 160 | |
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[11403] | 161 | SUBROUTINE isfpar_mlt_oasis(kt, pqhc , pqoce, pqfwf ) |
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| 162 | !!---------------------------------------------------------------------- |
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[11541] | 163 | !! *** ROUTINE isfpar_mlt_oasis *** |
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[11403] | 164 | !! |
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| 165 | !! ** Purpose : scale the fwf read from input file by the total amount received by the sbccpl interface |
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| 166 | !! |
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[11494] | 167 | !! ** Purpose : - read ice shelf melt from forcing file and scale it by the input file total amount => pattern |
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| 168 | !! - compute total amount of fwf given by sbccpl (fwfisf_oasis) |
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[11403] | 169 | !! - scale fwf and compute heat fluxes |
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| 170 | !! |
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| 171 | !!--------------------------------------------------------------------- |
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| 172 | !!-------------------------- OUT ------------------------------------- |
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| 173 | REAL(wp), DIMENSION(jpi,jpj), INTENT( out) :: pqhc, pqoce, pqfwf ! heat content, latent heat and fwf fluxes |
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| 174 | !!-------------------------- IN ------------------------------------- |
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| 175 | INTEGER , INTENT(in ) :: kt ! current time step |
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| 176 | !!-------------------------------------------------------------------- |
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| 177 | INTEGER :: jk ! loop index |
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[11541] | 178 | REAL(wp) :: zfwf_fld, zfwf_oasis ! total fwf in the forcing fields (pattern) and from the cpl interface (amount) |
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[11403] | 179 | REAL(wp), DIMENSION(jpi,jpj) :: ztfrz ! tbl freezing temperature |
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| 180 | REAL(wp), DIMENSION(jpi,jpj) :: zfwf ! 2d fwf map after scaling |
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| 181 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: ztfrz3d |
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| 182 | !!-------------------------------------------------------------------- |
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| 183 | ! |
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| 184 | ! 0. ------------Read specified runoff |
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[11852] | 185 | CALL fld_read ( kt, 1, sf_isfpar_fwf ) |
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[11403] | 186 | ! |
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[11541] | 187 | ! 1. ------------Mean freezing point (needed for heat content flux) |
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[11403] | 188 | DO jk = 1,jpk |
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| 189 | CALL eos_fzp(tsn(:,:,jk,jp_sal), ztfrz3d(:,:,jk), gdept_n(:,:,jk)) |
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| 190 | END DO |
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[11495] | 191 | CALL isf_tbl(ztfrz3d, ztfrz, 'T', misfkt_par, rhisf_tbl_par, misfkb_par, rfrac_tbl_par ) |
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[11403] | 192 | ! |
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[11541] | 193 | ! 2. ------------Scale isf melt pattern with total amount from oasis |
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[11403] | 194 | ! ice shelf 2d map |
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| 195 | zfwf(:,:) = - sf_isfpar_fwf(1)%fnow(:,:,1) |
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| 196 | ! |
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| 197 | ! compute glob sum from input file |
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[11425] | 198 | ! (PM) should we consider delay sum as in fwb ? (it will offset by 1 time step if I understood well) |
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| 199 | zfwf_fld = glob_sum('isfcav_mlt', e1e2t(:,:) * zfwf(:,:)) |
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[11403] | 200 | ! |
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| 201 | ! compute glob sum from atm->oce ice shelf fwf |
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[11425] | 202 | ! (PM) should we consider delay sum as in fwb ? |
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| 203 | zfwf_oasis = glob_sum('isfcav_mlt', e1e2t(:,:) * fwfisf_oasis(:,:)) |
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[11403] | 204 | ! |
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| 205 | ! scale fwf |
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[11423] | 206 | zfwf(:,:) = zfwf(:,:) * zfwf_oasis / zfwf_fld |
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[11403] | 207 | ! |
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[11541] | 208 | ! i3. -----------Define fwf and qoce |
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[11403] | 209 | ! ocean heat flux is assume to be equal to the latent heat |
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| 210 | pqfwf(:,:) = zfwf(:,:) ! fwf ( >0 out ) |
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| 211 | pqoce(:,:) = - pqfwf(:,:) * rLfusisf ! ocean heat flux ( >0 out ) (assumed to be the latent heat flux) |
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| 212 | pqhc (:,:) = pqfwf(:,:) * ztfrz(:,:) * rcp ! heat content flux ( >0 out ) |
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| 213 | ! |
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[11876] | 214 | CALL iom_put('isftfrz_par', ztfrz ) |
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| 215 | ! |
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[11395] | 216 | END SUBROUTINE isfpar_mlt_oasis |
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| 217 | |
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| 218 | END MODULE isfparmlt |
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