| 1 | MODULE iceupdate |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE iceupdate *** |
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| 4 | !! Sea-ice : computation of the flux at the sea ice/ocean interface |
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| 5 | !!====================================================================== |
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| 6 | !! History : 4.0 ! 2018 (many people) SI3 [aka Sea Ice cube] |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | #if defined key_si3 |
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| 9 | !!---------------------------------------------------------------------- |
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| 10 | !! 'key_si3' SI3 sea-ice model |
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| 11 | !!---------------------------------------------------------------------- |
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| 12 | !! ice_update_alloc : allocate the iceupdate arrays |
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| 13 | !! ice_update_init : initialisation |
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| 14 | !! ice_update_flx : updates mass, heat and salt fluxes at the ocean surface |
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| 15 | !! ice_update_tau : update i- and j-stresses, and its modulus at the ocean surface |
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| 16 | !!---------------------------------------------------------------------- |
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| 17 | USE oce , ONLY : sshn, sshb |
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| 18 | USE phycst ! physical constants |
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| 19 | USE dom_oce ! ocean domain |
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| 20 | USE ice ! sea-ice: variables |
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| 21 | USE sbc_ice ! Surface boundary condition: ice fields |
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| 22 | USE sbc_oce ! Surface boundary condition: ocean fields |
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| 23 | USE sbccpl ! Surface boundary condition: coupled interface |
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| 24 | USE icealb ! sea-ice: albedo parameters |
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| 25 | USE traqsr ! add penetration of solar flux in the calculation of heat budget |
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| 26 | USE icectl ! sea-ice: control prints |
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| 27 | USE zdfdrg , ONLY : ln_drgice_imp |
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| 28 | ! |
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| 29 | USE in_out_manager ! I/O manager |
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| 30 | USE iom ! I/O manager library |
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| 31 | USE lib_mpp ! MPP library |
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| 32 | USE lib_fortran ! fortran utilities (glob_sum + no signed zero) |
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| 33 | USE lbclnk ! lateral boundary conditions (or mpp links) |
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| 34 | USE timing ! Timing |
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| 35 | |
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| 36 | IMPLICIT NONE |
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| 37 | PRIVATE |
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| 38 | |
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| 39 | PUBLIC ice_update_init ! called by ice_init |
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| 40 | PUBLIC ice_update_flx ! called by ice_stp |
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| 41 | PUBLIC ice_update_tau ! called by ice_stp |
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| 42 | |
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| 43 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: utau_oce, vtau_oce ! air-ocean surface i- & j-stress [N/m2] |
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| 44 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: tmod_io ! modulus of the ice-ocean velocity [m/s] |
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| 45 | |
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| 46 | !! * Substitutions |
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| 47 | # include "vectopt_loop_substitute.h90" |
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| 48 | !!---------------------------------------------------------------------- |
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| 49 | !! NEMO/ICE 4.0 , NEMO Consortium (2018) |
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| 50 | !! $Id$ |
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| 51 | !! Software governed by the CeCILL license (see ./LICENSE) |
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| 52 | !!---------------------------------------------------------------------- |
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| 53 | CONTAINS |
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| 54 | |
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| 55 | INTEGER FUNCTION ice_update_alloc() |
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| 56 | !!------------------------------------------------------------------- |
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| 57 | !! *** ROUTINE ice_update_alloc *** |
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| 58 | !!------------------------------------------------------------------- |
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| 59 | ALLOCATE( utau_oce(jpi,jpj), vtau_oce(jpi,jpj), tmod_io(jpi,jpj), STAT=ice_update_alloc ) |
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| 60 | ! |
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| 61 | CALL mpp_sum( 'iceupdate', ice_update_alloc ) |
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| 62 | IF( ice_update_alloc /= 0 ) CALL ctl_stop( 'STOP', 'ice_update_alloc: failed to allocate arrays' ) |
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| 63 | ! |
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| 64 | END FUNCTION ice_update_alloc |
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| 65 | |
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| 66 | |
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| 67 | SUBROUTINE ice_update_flx( kt ) |
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| 68 | !!------------------------------------------------------------------- |
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| 69 | !! *** ROUTINE ice_update_flx *** |
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| 70 | !! |
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| 71 | !! ** Purpose : Update the surface ocean boundary condition for heat |
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| 72 | !! salt and mass over areas where sea-ice is non-zero |
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| 73 | !! |
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| 74 | !! ** Action : - computes the heat and freshwater/salt fluxes |
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| 75 | !! at the ice-ocean interface. |
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| 76 | !! - Update the ocean sbc |
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| 77 | !! |
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| 78 | !! ** Outputs : - qsr : sea heat flux: solar |
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| 79 | !! - qns : sea heat flux: non solar |
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| 80 | !! - emp : freshwater budget: volume flux |
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| 81 | !! - sfx : salt flux |
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| 82 | !! - fr_i : ice fraction |
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| 83 | !! - tn_ice : sea-ice surface temperature |
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| 84 | !! - alb_ice : sea-ice albedo (recomputed only for coupled mode) |
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| 85 | !! |
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| 86 | !! References : Goosse, H. et al. 1996, Bul. Soc. Roy. Sc. Liege, 65, 87-90. |
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| 87 | !! Tartinville et al. 2001 Ocean Modelling, 3, 95-108. |
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| 88 | !! These refs are now obsolete since everything has been revised |
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| 89 | !! The ref should be Rousset et al., 2015 |
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| 90 | !!--------------------------------------------------------------------- |
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| 91 | INTEGER, INTENT(in) :: kt ! number of iteration |
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| 92 | ! |
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| 93 | INTEGER :: ji, jj, jl, jk ! dummy loop indices |
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| 94 | REAL(wp) :: zqsr ! New solar flux received by the ocean |
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| 95 | REAL(wp), DIMENSION(jpi,jpj) :: z2d ! 2D workspace |
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| 96 | !!--------------------------------------------------------------------- |
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| 97 | IF( ln_timing ) CALL timing_start('ice_update') |
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| 98 | |
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| 99 | IF( kt == nit000 .AND. lwp ) THEN |
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| 100 | WRITE(numout,*) |
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| 101 | WRITE(numout,*)'ice_update_flx: update fluxes (mass, salt and heat) at the ice-ocean interface' |
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| 102 | WRITE(numout,*)'~~~~~~~~~~~~~~' |
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| 103 | ENDIF |
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| 104 | |
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| 105 | ! Net heat flux on top of the ice-ocean (W.m-2) |
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| 106 | !---------------------------------------------- |
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| 107 | qt_atm_oi(:,:) = qns_tot(:,:) + qsr_tot(:,:) |
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| 108 | |
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| 109 | ! --- case we bypass ice thermodynamics --- ! |
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| 110 | IF( .NOT. ln_icethd ) THEN ! we suppose ice is impermeable => ocean is isolated from atmosphere |
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| 111 | qt_atm_oi (:,:) = ( 1._wp - at_i_b(:,:) ) * ( qns_oce(:,:) + qsr_oce(:,:) ) + qemp_oce(:,:) |
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| 112 | qt_oce_ai (:,:) = ( 1._wp - at_i_b(:,:) ) * qns_oce(:,:) + qemp_oce(:,:) |
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| 113 | emp_ice (:,:) = 0._wp |
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| 114 | qemp_ice (:,:) = 0._wp |
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| 115 | qevap_ice (:,:,:) = 0._wp |
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| 116 | ENDIF |
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| 117 | |
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| 118 | DO jj = 1, jpj |
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| 119 | DO ji = 1, jpi |
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| 120 | |
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| 121 | ! Solar heat flux reaching the ocean (max) = zqsr (W.m-2) |
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| 122 | !--------------------------------------------------- |
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| 123 | zqsr = qsr_tot(ji,jj) - SUM( a_i_b(ji,jj,:) * ( qsr_ice(ji,jj,:) - qtr_ice_bot(ji,jj,:) ) ) |
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| 124 | |
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| 125 | ! Total heat flux reaching the ocean = qt_oce_ai (W.m-2) |
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| 126 | !--------------------------------------------------- |
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| 127 | qt_oce_ai(ji,jj) = qt_atm_oi(ji,jj) - hfx_sum(ji,jj) - hfx_bom(ji,jj) - hfx_bog(ji,jj) & |
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| 128 | & - hfx_dif(ji,jj) - hfx_opw(ji,jj) - hfx_snw(ji,jj) & |
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| 129 | & + hfx_thd(ji,jj) + hfx_dyn(ji,jj) + hfx_res(ji,jj) & |
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| 130 | & + hfx_sub(ji,jj) - SUM( qevap_ice(ji,jj,:) * a_i_b(ji,jj,:) ) + hfx_spr(ji,jj) |
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| 131 | |
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| 132 | ! New qsr and qns used to compute the oceanic heat flux at the next time step |
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| 133 | !---------------------------------------------------------------------------- |
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| 134 | ! if warming and some ice remains, then we suppose that the whole solar flux has been consumed to melt the ice |
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| 135 | ! else ( cooling or no ice left ), then we suppose that no solar flux has been consumed |
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| 136 | ! |
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| 137 | IF( fhld(ji,jj) > 0._wp .AND. at_i(ji,jj) > 0._wp ) THEN !-- warming and some ice remains |
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| 138 | ! solar flux transmitted thru the 1st level of the ocean (i.e. not used by sea-ice) |
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| 139 | qsr(ji,jj) = ( 1._wp - at_i_b(ji,jj) ) * qsr_oce(ji,jj) * ( 1._wp - frq_m(ji,jj) ) & |
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| 140 | ! + solar flux transmitted thru ice and the 1st ocean level (also not used by sea-ice) |
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| 141 | & + SUM( a_i_b(ji,jj,:) * qtr_ice_bot(ji,jj,:) ) * ( 1._wp - frq_m(ji,jj) ) |
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| 142 | ! |
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| 143 | ELSE !-- cooling or no ice left |
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| 144 | qsr(ji,jj) = zqsr |
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| 145 | ENDIF |
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| 146 | ! |
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| 147 | ! the non-solar is simply derived from the solar flux |
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| 148 | qns(ji,jj) = qt_oce_ai(ji,jj) - zqsr |
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| 149 | |
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| 150 | ! Mass flux at the atm. surface |
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| 151 | !----------------------------------- |
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| 152 | wfx_sub(ji,jj) = wfx_snw_sub(ji,jj) + wfx_ice_sub(ji,jj) |
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| 153 | |
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| 154 | ! Mass flux at the ocean surface |
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| 155 | !------------------------------------ |
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| 156 | ! ice-ocean mass flux |
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| 157 | wfx_ice(ji,jj) = wfx_bog(ji,jj) + wfx_bom(ji,jj) + wfx_sum(ji,jj) + wfx_sni(ji,jj) & |
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| 158 | & + wfx_opw(ji,jj) + wfx_dyn(ji,jj) + wfx_res(ji,jj) + wfx_lam(ji,jj) + wfx_pnd(ji,jj) |
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| 159 | |
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| 160 | ! snw-ocean mass flux |
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| 161 | wfx_snw(ji,jj) = wfx_snw_sni(ji,jj) + wfx_snw_dyn(ji,jj) + wfx_snw_sum(ji,jj) |
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| 162 | |
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| 163 | ! total mass flux at the ocean/ice interface |
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| 164 | fmmflx(ji,jj) = - wfx_ice(ji,jj) - wfx_snw(ji,jj) - wfx_err_sub(ji,jj) ! ice-ocean mass flux saved at least for biogeochemical model |
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| 165 | emp (ji,jj) = emp_oce(ji,jj) - wfx_ice(ji,jj) - wfx_snw(ji,jj) - wfx_err_sub(ji,jj) ! atm-ocean + ice-ocean mass flux |
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| 166 | |
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| 167 | ! Salt flux at the ocean surface |
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| 168 | !------------------------------------------ |
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| 169 | sfx(ji,jj) = sfx_bog(ji,jj) + sfx_bom(ji,jj) + sfx_sum(ji,jj) + sfx_sni(ji,jj) + sfx_opw(ji,jj) & |
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| 170 | & + sfx_res(ji,jj) + sfx_dyn(ji,jj) + sfx_bri(ji,jj) + sfx_sub(ji,jj) + sfx_lam(ji,jj) |
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| 171 | |
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| 172 | ! Mass of snow and ice per unit area |
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| 173 | !---------------------------------------- |
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| 174 | snwice_mass_b(ji,jj) = snwice_mass(ji,jj) ! save mass from the previous ice time step |
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| 175 | ! ! new mass per unit area |
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| 176 | snwice_mass (ji,jj) = tmask(ji,jj,1) * ( rhos * vt_s(ji,jj) + rhoi * vt_i(ji,jj) ) |
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| 177 | ! ! time evolution of snow+ice mass |
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| 178 | snwice_fmass (ji,jj) = ( snwice_mass(ji,jj) - snwice_mass_b(ji,jj) ) * r1_rdtice |
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| 179 | |
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| 180 | END DO |
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| 181 | END DO |
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| 182 | |
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| 183 | ! Storing the transmitted variables |
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| 184 | !---------------------------------- |
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| 185 | fr_i (:,:) = at_i(:,:) ! Sea-ice fraction |
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| 186 | tn_ice(:,:,:) = t_su(:,:,:) ! Ice surface temperature |
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| 187 | |
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| 188 | ! Snow/ice albedo (only if sent to coupler, useless in forced mode) |
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| 189 | !------------------------------------------------------------------ |
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| 190 | CALL ice_alb( t_su, h_i, h_s, ln_pnd_alb, a_ip_eff, h_ip, cloud_fra, alb_ice ) ! ice albedo |
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| 191 | |
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| 192 | ! |
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| 193 | IF( lrst_ice ) THEN !* write snwice_mass fields in the restart file |
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| 194 | CALL update_rst( 'WRITE', kt ) |
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| 195 | ENDIF |
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| 196 | ! |
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| 197 | ! output all fluxes |
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| 198 | !------------------ |
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| 199 | ! |
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| 200 | ! --- salt fluxes [kg/m2/s] --- ! |
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| 201 | ! ! sfxice = sfxbog + sfxbom + sfxsum + sfxsni + sfxopw + sfxres + sfxdyn + sfxbri + sfxsub + sfxlam |
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| 202 | IF( iom_use('sfxice' ) ) CALL iom_put( 'sfxice', sfx * 1.e-03 ) ! salt flux from total ice growth/melt |
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| 203 | IF( iom_use('sfxbog' ) ) CALL iom_put( 'sfxbog', sfx_bog * 1.e-03 ) ! salt flux from bottom growth |
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| 204 | IF( iom_use('sfxbom' ) ) CALL iom_put( 'sfxbom', sfx_bom * 1.e-03 ) ! salt flux from bottom melting |
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| 205 | IF( iom_use('sfxsum' ) ) CALL iom_put( 'sfxsum', sfx_sum * 1.e-03 ) ! salt flux from surface melting |
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| 206 | IF( iom_use('sfxlam' ) ) CALL iom_put( 'sfxlam', sfx_lam * 1.e-03 ) ! salt flux from lateral melting |
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| 207 | IF( iom_use('sfxsni' ) ) CALL iom_put( 'sfxsni', sfx_sni * 1.e-03 ) ! salt flux from snow ice formation |
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| 208 | IF( iom_use('sfxopw' ) ) CALL iom_put( 'sfxopw', sfx_opw * 1.e-03 ) ! salt flux from open water formation |
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| 209 | IF( iom_use('sfxdyn' ) ) CALL iom_put( 'sfxdyn', sfx_dyn * 1.e-03 ) ! salt flux from ridging rafting |
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| 210 | IF( iom_use('sfxbri' ) ) CALL iom_put( 'sfxbri', sfx_bri * 1.e-03 ) ! salt flux from brines |
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| 211 | IF( iom_use('sfxres' ) ) CALL iom_put( 'sfxres', sfx_res * 1.e-03 ) ! salt flux from undiagnosed processes |
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| 212 | IF( iom_use('sfxsub' ) ) CALL iom_put( 'sfxsub', sfx_sub * 1.e-03 ) ! salt flux from sublimation |
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| 213 | |
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| 214 | ! --- mass fluxes [kg/m2/s] --- ! |
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| 215 | CALL iom_put( 'emp_oce', emp_oce ) ! emp over ocean (taking into account the snow blown away from the ice) |
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| 216 | CALL iom_put( 'emp_ice', emp_ice ) ! emp over ice (taking into account the snow blown away from the ice) |
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| 217 | |
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| 218 | ! ! vfxice = vfxbog + vfxbom + vfxsum + vfxsni + vfxopw + vfxdyn + vfxres + vfxlam + vfxpnd |
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| 219 | CALL iom_put( 'vfxice' , wfx_ice ) ! mass flux from total ice growth/melt |
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| 220 | CALL iom_put( 'vfxbog' , wfx_bog ) ! mass flux from bottom growth |
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| 221 | CALL iom_put( 'vfxbom' , wfx_bom ) ! mass flux from bottom melt |
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| 222 | CALL iom_put( 'vfxsum' , wfx_sum ) ! mass flux from surface melt |
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| 223 | CALL iom_put( 'vfxlam' , wfx_lam ) ! mass flux from lateral melt |
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| 224 | CALL iom_put( 'vfxsni' , wfx_sni ) ! mass flux from snow-ice formation |
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| 225 | CALL iom_put( 'vfxopw' , wfx_opw ) ! mass flux from growth in open water |
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| 226 | CALL iom_put( 'vfxdyn' , wfx_dyn ) ! mass flux from dynamics (ridging) |
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| 227 | CALL iom_put( 'vfxres' , wfx_res ) ! mass flux from undiagnosed processes |
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| 228 | CALL iom_put( 'vfxpnd' , wfx_pnd ) ! mass flux from melt ponds |
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| 229 | CALL iom_put( 'vfxsub' , wfx_ice_sub ) ! mass flux from ice sublimation (ice-atm.) |
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| 230 | CALL iom_put( 'vfxsub_err', wfx_err_sub ) ! "excess" of sublimation sent to ocean |
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| 231 | |
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| 232 | IF ( iom_use( 'vfxthin' ) ) THEN ! mass flux from ice growth in open water + thin ice (<20cm) => comparable to observations |
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| 233 | WHERE( hm_i(:,:) < 0.2 .AND. hm_i(:,:) > 0. ) ; z2d = wfx_bog |
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| 234 | ELSEWHERE ; z2d = 0._wp |
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| 235 | END WHERE |
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| 236 | CALL iom_put( 'vfxthin', wfx_opw + z2d ) |
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| 237 | ENDIF |
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| 238 | |
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| 239 | ! ! vfxsnw = vfxsnw_sni + vfxsnw_dyn + vfxsnw_sum |
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| 240 | CALL iom_put( 'vfxsnw' , wfx_snw ) ! mass flux from total snow growth/melt |
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| 241 | CALL iom_put( 'vfxsnw_sum' , wfx_snw_sum ) ! mass flux from snow melt at the surface |
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| 242 | CALL iom_put( 'vfxsnw_sni' , wfx_snw_sni ) ! mass flux from snow melt during snow-ice formation |
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| 243 | CALL iom_put( 'vfxsnw_dyn' , wfx_snw_dyn ) ! mass flux from dynamics (ridging) |
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| 244 | CALL iom_put( 'vfxsnw_sub' , wfx_snw_sub ) ! mass flux from snow sublimation (ice-atm.) |
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| 245 | CALL iom_put( 'vfxsnw_pre' , wfx_spr ) ! snow precip |
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| 246 | |
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| 247 | ! --- heat fluxes [W/m2] --- ! |
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| 248 | ! ! qt_atm_oi - qt_oce_ai = hfxdhc - ( dihctrp + dshctrp ) |
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| 249 | IF( iom_use('qsr_oce' ) ) CALL iom_put( 'qsr_oce' , qsr_oce * ( 1._wp - at_i_b ) ) ! solar flux at ocean surface |
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| 250 | IF( iom_use('qns_oce' ) ) CALL iom_put( 'qns_oce' , qns_oce * ( 1._wp - at_i_b ) + qemp_oce ) ! non-solar flux at ocean surface |
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| 251 | IF( iom_use('qsr_ice' ) ) CALL iom_put( 'qsr_ice' , SUM( qsr_ice * a_i_b, dim=3 ) ) ! solar flux at ice surface |
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| 252 | IF( iom_use('qns_ice' ) ) CALL iom_put( 'qns_ice' , SUM( qns_ice * a_i_b, dim=3 ) + qemp_ice ) ! non-solar flux at ice surface |
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| 253 | IF( iom_use('qtr_ice_bot') ) CALL iom_put( 'qtr_ice_bot', SUM( qtr_ice_bot * a_i_b, dim=3 ) ) ! solar flux transmitted thru ice |
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| 254 | IF( iom_use('qtr_ice_top') ) CALL iom_put( 'qtr_ice_top', SUM( qtr_ice_top * a_i_b, dim=3 ) ) ! solar flux transmitted thru ice surface |
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| 255 | IF( iom_use('qt_oce' ) ) CALL iom_put( 'qt_oce' , ( qsr_oce + qns_oce ) * ( 1._wp - at_i_b ) + qemp_oce ) |
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| 256 | IF( iom_use('qt_ice' ) ) CALL iom_put( 'qt_ice' , SUM( ( qns_ice + qsr_ice ) * a_i_b, dim=3 ) + qemp_ice ) |
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| 257 | IF( iom_use('qt_oce_ai' ) ) CALL iom_put( 'qt_oce_ai' , qt_oce_ai * tmask(:,:,1) ) ! total heat flux at the ocean surface: interface oce-(ice+atm) |
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| 258 | IF( iom_use('qt_atm_oi' ) ) CALL iom_put( 'qt_atm_oi' , qt_atm_oi * tmask(:,:,1) ) ! total heat flux at the oce-ice surface: interface atm-(ice+oce) |
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| 259 | IF( iom_use('qemp_oce' ) ) CALL iom_put( 'qemp_oce' , qemp_oce ) ! Downward Heat Flux from E-P over ocean |
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| 260 | IF( iom_use('qemp_ice' ) ) CALL iom_put( 'qemp_ice' , qemp_ice ) ! Downward Heat Flux from E-P over ice |
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| 261 | |
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| 262 | ! heat fluxes from ice transformations |
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| 263 | ! ! hfxdhc = hfxbog + hfxbom + hfxsum + hfxopw + hfxdif + hfxsnw - ( hfxthd + hfxdyn + hfxres + hfxsub + hfxspr ) |
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| 264 | CALL iom_put ('hfxbog' , hfx_bog ) ! heat flux used for ice bottom growth |
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| 265 | CALL iom_put ('hfxbom' , hfx_bom ) ! heat flux used for ice bottom melt |
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| 266 | CALL iom_put ('hfxsum' , hfx_sum ) ! heat flux used for ice surface melt |
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| 267 | CALL iom_put ('hfxopw' , hfx_opw ) ! heat flux used for ice formation in open water |
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| 268 | CALL iom_put ('hfxdif' , hfx_dif ) ! heat flux used for ice temperature change |
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| 269 | CALL iom_put ('hfxsnw' , hfx_snw ) ! heat flux used for snow melt |
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| 270 | CALL iom_put ('hfxerr' , hfx_err_dif ) ! heat flux error after heat diffusion |
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| 271 | |
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| 272 | ! heat fluxes associated with mass exchange (freeze/melt/precip...) |
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| 273 | CALL iom_put ('hfxthd' , hfx_thd ) ! |
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| 274 | CALL iom_put ('hfxdyn' , hfx_dyn ) ! |
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| 275 | CALL iom_put ('hfxres' , hfx_res ) ! |
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| 276 | CALL iom_put ('hfxsub' , hfx_sub ) ! |
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| 277 | CALL iom_put ('hfxspr' , hfx_spr ) ! Heat flux from snow precip heat content |
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| 278 | |
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| 279 | ! other heat fluxes |
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| 280 | IF( iom_use('hfxsensib' ) ) CALL iom_put( 'hfxsensib' , -qsb_ice_bot * at_i_b ) ! Sensible oceanic heat flux |
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| 281 | IF( iom_use('hfxcndbot' ) ) CALL iom_put( 'hfxcndbot' , SUM( qcn_ice_bot * a_i_b, dim=3 ) ) ! Bottom conduction flux |
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| 282 | IF( iom_use('hfxcndtop' ) ) CALL iom_put( 'hfxcndtop' , SUM( qcn_ice_top * a_i_b, dim=3 ) ) ! Surface conduction flux |
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| 283 | |
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| 284 | ! controls |
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| 285 | !--------- |
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| 286 | #if ! defined key_agrif |
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| 287 | IF( ln_icediachk ) CALL ice_cons_final('iceupdate') ! conservation |
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| 288 | #endif |
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| 289 | IF( ln_icectl ) CALL ice_prt (kt, iiceprt, jiceprt, 3, 'Final state ice_update') ! prints |
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| 290 | IF( ln_ctl ) CALL ice_prt3D ('iceupdate') ! prints |
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| 291 | IF( ln_timing ) CALL timing_stop ('ice_update') ! timing |
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| 292 | ! |
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| 293 | END SUBROUTINE ice_update_flx |
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| 294 | |
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| 295 | |
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| 296 | SUBROUTINE ice_update_tau( kt, pu_oce, pv_oce ) |
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| 297 | !!------------------------------------------------------------------- |
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| 298 | !! *** ROUTINE ice_update_tau *** |
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| 299 | !! |
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| 300 | !! ** Purpose : Update the ocean surface stresses due to the ice |
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| 301 | !! |
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| 302 | !! ** Action : * at each ice time step (every nn_fsbc time step): |
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| 303 | !! - compute the modulus of ice-ocean relative velocity |
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| 304 | !! (*rho*Cd) at T-point (C-grid) or I-point (B-grid) |
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| 305 | !! tmod_io = rhoco * | U_ice-U_oce | |
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| 306 | !! - update the modulus of stress at ocean surface |
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| 307 | !! taum = (1-a) * taum + a * tmod_io * | U_ice-U_oce | |
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| 308 | !! * at each ocean time step (every kt): |
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| 309 | !! compute linearized ice-ocean stresses as |
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| 310 | !! Utau = tmod_io * | U_ice - pU_oce | |
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| 311 | !! using instantaneous current ocean velocity (usually before) |
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| 312 | !! |
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| 313 | !! NB: - ice-ocean rotation angle no more allowed |
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| 314 | !! - here we make an approximation: taum is only computed every ice time step |
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| 315 | !! This avoids mutiple average to pass from T -> U,V grids and next from U,V grids |
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| 316 | !! to T grid. taum is used in TKE and GLS, which should not be too sensitive to this approximaton... |
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| 317 | !! |
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| 318 | !! ** Outputs : - utau, vtau : surface ocean i- and j-stress (u- & v-pts) updated with ice-ocean fluxes |
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| 319 | !! - taum : modulus of the surface ocean stress (T-point) updated with ice-ocean fluxes |
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| 320 | !!--------------------------------------------------------------------- |
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| 321 | INTEGER , INTENT(in) :: kt ! ocean time-step index |
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| 322 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: pu_oce, pv_oce ! surface ocean currents |
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| 323 | ! |
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| 324 | INTEGER :: ji, jj ! dummy loop indices |
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| 325 | REAL(wp) :: zat_u, zutau_ice, zu_t, zmodt ! local scalar |
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| 326 | REAL(wp) :: zat_v, zvtau_ice, zv_t, zrhoco ! - - |
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| 327 | REAL(wp) :: zflagi ! - - |
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| 328 | !!--------------------------------------------------------------------- |
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| 329 | IF( ln_timing ) CALL timing_start('ice_update_tau') |
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| 330 | |
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| 331 | IF( kt == nit000 .AND. lwp ) THEN |
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| 332 | WRITE(numout,*) |
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| 333 | WRITE(numout,*)'ice_update_tau: update stress at the ice-ocean interface' |
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| 334 | WRITE(numout,*)'~~~~~~~~~~~~~~' |
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| 335 | ENDIF |
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| 336 | |
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| 337 | zrhoco = rau0 * rn_cio |
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| 338 | ! |
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| 339 | IF( MOD( kt-1, nn_fsbc ) == 0 ) THEN !== Ice time-step only ==! (i.e. surface module time-step) |
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| 340 | DO jj = 2, jpjm1 !* update the modulus of stress at ocean surface (T-point) |
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| 341 | DO ji = fs_2, fs_jpim1 |
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| 342 | ! ! 2*(U_ice-U_oce) at T-point |
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| 343 | zu_t = u_ice(ji,jj) + u_ice(ji-1,jj) - u_oce(ji,jj) - u_oce(ji-1,jj) |
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| 344 | zv_t = v_ice(ji,jj) + v_ice(ji,jj-1) - v_oce(ji,jj) - v_oce(ji,jj-1) |
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| 345 | ! ! |U_ice-U_oce|^2 |
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| 346 | zmodt = 0.25_wp * ( zu_t * zu_t + zv_t * zv_t ) |
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| 347 | ! ! update the ocean stress modulus |
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| 348 | taum(ji,jj) = ( 1._wp - at_i(ji,jj) ) * taum(ji,jj) + at_i(ji,jj) * zrhoco * zmodt |
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| 349 | tmod_io(ji,jj) = zrhoco * SQRT( zmodt ) ! rhoco * |U_ice-U_oce| at T-point |
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| 350 | END DO |
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| 351 | END DO |
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| 352 | CALL lbc_lnk_multi( 'iceupdate', taum, 'T', 1., tmod_io, 'T', 1. ) |
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| 353 | ! |
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| 354 | utau_oce(:,:) = utau(:,:) !* save the air-ocean stresses at ice time-step |
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| 355 | vtau_oce(:,:) = vtau(:,:) |
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| 356 | ! |
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| 357 | ENDIF |
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| 358 | ! |
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| 359 | ! !== every ocean time-step ==! |
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| 360 | IF ( ln_drgice_imp ) THEN |
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| 361 | ! Save drag with right sign to update top drag in the ocean implicit friction |
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| 362 | rCdU_ice(:,:) = -r1_rau0 * tmod_io(:,:) * at_i(:,:) * tmask(:,:,1) |
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| 363 | zflagi = 0._wp |
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| 364 | ELSE |
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| 365 | zflagi = 1._wp |
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| 366 | ENDIF |
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| 367 | ! |
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| 368 | DO jj = 2, jpjm1 !* update the stress WITHOUT an ice-ocean rotation angle |
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| 369 | DO ji = fs_2, fs_jpim1 ! Vect. Opt. |
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| 370 | ! ice area at u and v-points |
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| 371 | zat_u = ( at_i(ji,jj) * tmask(ji,jj,1) + at_i (ji+1,jj ) * tmask(ji+1,jj ,1) ) & |
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| 372 | & / MAX( 1.0_wp , tmask(ji,jj,1) + tmask(ji+1,jj ,1) ) |
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| 373 | zat_v = ( at_i(ji,jj) * tmask(ji,jj,1) + at_i (ji ,jj+1 ) * tmask(ji ,jj+1,1) ) & |
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| 374 | & / MAX( 1.0_wp , tmask(ji,jj,1) + tmask(ji ,jj+1,1) ) |
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| 375 | ! ! linearized quadratic drag formulation |
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| 376 | zutau_ice = 0.5_wp * ( tmod_io(ji,jj) + tmod_io(ji+1,jj) ) * ( u_ice(ji,jj) - zflagi * pu_oce(ji,jj) ) |
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| 377 | zvtau_ice = 0.5_wp * ( tmod_io(ji,jj) + tmod_io(ji,jj+1) ) * ( v_ice(ji,jj) - zflagi * pv_oce(ji,jj) ) |
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| 378 | ! ! stresses at the ocean surface |
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| 379 | utau(ji,jj) = ( 1._wp - zat_u ) * utau_oce(ji,jj) + zat_u * zutau_ice |
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| 380 | vtau(ji,jj) = ( 1._wp - zat_v ) * vtau_oce(ji,jj) + zat_v * zvtau_ice |
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| 381 | END DO |
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| 382 | END DO |
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| 383 | CALL lbc_lnk_multi( 'iceupdate', utau, 'U', -1., vtau, 'V', -1. ) ! lateral boundary condition |
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| 384 | ! |
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| 385 | IF( ln_timing ) CALL timing_stop('ice_update_tau') |
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| 386 | ! |
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| 387 | END SUBROUTINE ice_update_tau |
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| 388 | |
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| 389 | |
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| 390 | SUBROUTINE ice_update_init |
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| 391 | !!------------------------------------------------------------------- |
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| 392 | !! *** ROUTINE ice_update_init *** |
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| 393 | !! |
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| 394 | !! ** Purpose : allocate ice-ocean stress fields and read restarts |
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| 395 | !! containing the snow & ice mass |
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| 396 | !! |
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| 397 | !!------------------------------------------------------------------- |
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| 398 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 399 | REAL(wp) :: zcoefu, zcoefv, zcoeff ! local scalar |
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| 400 | !!------------------------------------------------------------------- |
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| 401 | ! |
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| 402 | IF(lwp) WRITE(numout,*) |
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| 403 | IF(lwp) WRITE(numout,*) 'ice_update_init: ice-ocean stress init' |
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| 404 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~~~~' |
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| 405 | ! |
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| 406 | ! ! allocate ice_update array |
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| 407 | IF( ice_update_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'ice_update_init : unable to allocate standard arrays' ) |
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| 408 | ! |
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| 409 | CALL update_rst( 'READ' ) !* read or initialize all required files |
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| 410 | ! |
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| 411 | END SUBROUTINE ice_update_init |
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| 412 | |
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| 413 | |
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| 414 | SUBROUTINE update_rst( cdrw, kt ) |
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| 415 | !!--------------------------------------------------------------------- |
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| 416 | !! *** ROUTINE rhg_evp_rst *** |
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| 417 | !! |
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| 418 | !! ** Purpose : Read or write RHG file in restart file |
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| 419 | !! |
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| 420 | !! ** Method : use of IOM library |
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| 421 | !!---------------------------------------------------------------------- |
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| 422 | CHARACTER(len=*) , INTENT(in) :: cdrw ! 'READ'/'WRITE' flag |
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| 423 | INTEGER, OPTIONAL, INTENT(in) :: kt ! ice time-step |
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| 424 | ! |
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| 425 | INTEGER :: iter ! local integer |
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| 426 | INTEGER :: id1 ! local integer |
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| 427 | !!---------------------------------------------------------------------- |
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| 428 | ! |
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| 429 | IF( TRIM(cdrw) == 'READ' ) THEN ! Read/initialize |
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| 430 | ! ! --------------- |
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| 431 | IF( ln_rstart ) THEN !* Read the restart file |
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| 432 | ! |
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| 433 | id1 = iom_varid( numrir, 'snwice_mass' , ldstop = .FALSE. ) |
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| 434 | ! |
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| 435 | IF( id1 > 0 ) THEN ! fields exist |
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| 436 | CALL iom_get( numrir, jpdom_autoglo, 'snwice_mass' , snwice_mass ) |
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| 437 | CALL iom_get( numrir, jpdom_autoglo, 'snwice_mass_b', snwice_mass_b ) |
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| 438 | ELSE ! start from rest |
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| 439 | IF(lwp) WRITE(numout,*) ' ==>> previous run without snow-ice mass output then set it' |
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| 440 | snwice_mass (:,:) = tmask(:,:,1) * ( rhos * vt_s(:,:) + rhoi * vt_i(:,:) ) |
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| 441 | snwice_mass_b(:,:) = snwice_mass(:,:) |
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| 442 | ENDIF |
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| 443 | ELSE !* Start from rest |
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| 444 | IF(lwp) WRITE(numout,*) ' ==>> start from rest: set the snow-ice mass' |
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| 445 | snwice_mass (:,:) = tmask(:,:,1) * ( rhos * vt_s(:,:) + rhoi * vt_i(:,:) ) |
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| 446 | snwice_mass_b(:,:) = snwice_mass(:,:) |
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| 447 | ENDIF |
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| 448 | ! |
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| 449 | ELSEIF( TRIM(cdrw) == 'WRITE' ) THEN ! Create restart file |
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| 450 | ! ! ------------------- |
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| 451 | IF(lwp) WRITE(numout,*) '---- update-rst ----' |
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| 452 | iter = kt + nn_fsbc - 1 ! ice restarts are written at kt == nitrst - nn_fsbc + 1 |
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| 453 | ! |
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| 454 | CALL iom_rstput( iter, nitrst, numriw, 'snwice_mass' , snwice_mass ) |
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| 455 | CALL iom_rstput( iter, nitrst, numriw, 'snwice_mass_b', snwice_mass_b ) |
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| 456 | ! |
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| 457 | ENDIF |
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| 458 | ! |
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| 459 | END SUBROUTINE update_rst |
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| 460 | |
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| 461 | #else |
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| 462 | !!---------------------------------------------------------------------- |
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| 463 | !! Default option Dummy module NO SI3 sea-ice model |
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| 464 | !!---------------------------------------------------------------------- |
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| 465 | #endif |
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| 466 | |
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| 467 | !!====================================================================== |
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| 468 | END MODULE iceupdate |
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