| 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 : - ! 2006-07 (M. Vancoppelle) LIM3 original code |
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| 7 | !! 3.0 ! 2008-03 (C. Tallandier) surface module |
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| 8 | !! - ! 2008-04 (C. Tallandier) split in 2 + new ice-ocean coupling |
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| 9 | !! 3.3 ! 2010-05 (G. Madec) decrease ocean & ice reference salinities in the Baltic sea |
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| 10 | !! ! + simplification of the ice-ocean stress calculation |
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| 11 | !! 3.4 ! 2011-02 (G. Madec) dynamical allocation |
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| 12 | !! - ! 2012 (D. Iovino) salt flux change |
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| 13 | !! - ! 2012-05 (C. Rousset) add penetration solar flux |
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| 14 | !! 3.5 ! 2012-10 (A. Coward, G. Madec) salt fluxes ; ice+snow mass |
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| 15 | !!---------------------------------------------------------------------- |
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| 16 | #if defined key_lim3 |
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| 17 | !!---------------------------------------------------------------------- |
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| 18 | !! 'key_lim3' ESIM sea-ice model |
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| 19 | !!---------------------------------------------------------------------- |
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| 20 | !! ice_update_alloc : allocate the iceupdate arrays |
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| 21 | !! ice_update_init : initialisation |
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| 22 | !! ice_update_flx : updates mass, heat and salt fluxes at the ocean surface |
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| 23 | !! ice_update_tau : update i- and j-stresses, and its modulus at the ocean surface |
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| 24 | !!---------------------------------------------------------------------- |
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| 25 | USE oce , ONLY : sshn, sshb |
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| 26 | USE phycst ! physical constants |
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| 27 | USE dom_oce ! ocean domain |
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| 28 | USE ice ! sea-ice: variables |
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| 29 | USE sbc_ice ! Surface boundary condition: ice fields |
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| 30 | USE sbc_oce ! Surface boundary condition: ocean fields |
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| 31 | USE sbccpl ! Surface boundary condition: coupled interface |
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| 32 | USE icealb ! sea-ice: albedo parameters |
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| 33 | USE traqsr ! add penetration of solar flux in the calculation of heat budget |
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| 34 | USE icectl ! sea-ice: control prints |
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| 35 | USE bdy_oce , ONLY : ln_bdy |
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| 36 | ! |
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| 37 | USE in_out_manager ! I/O manager |
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| 38 | USE iom ! I/O manager library |
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| 39 | USE lib_mpp ! MPP library |
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| 40 | USE lib_fortran ! fortran utilities (glob_sum + no signed zero) |
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| 41 | USE lbclnk ! lateral boundary conditions (or mpp links) |
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| 42 | USE timing ! Timing |
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| 43 | |
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| 44 | IMPLICIT NONE |
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| 45 | PRIVATE |
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| 46 | |
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| 47 | PUBLIC ice_update_init ! called by ice_init |
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| 48 | PUBLIC ice_update_flx ! called by ice_stp |
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| 49 | PUBLIC ice_update_tau ! called by ice_stp |
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| 50 | |
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| 51 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: utau_oce, vtau_oce ! air-ocean surface i- & j-stress [N/m2] |
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| 52 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: tmod_io ! modulus of the ice-ocean velocity [m/s] |
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| 53 | |
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| 54 | !! * Substitutions |
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| 55 | # include "vectopt_loop_substitute.h90" |
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| 56 | !!---------------------------------------------------------------------- |
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| 57 | !! NEMO/ICE 4.0 , NEMO Consortium (2017) |
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| 58 | !! $Id: iceupdate.F90 8411 2017-08-07 16:09:12Z clem $ |
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| 59 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 60 | !!---------------------------------------------------------------------- |
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| 61 | CONTAINS |
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| 62 | |
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| 63 | INTEGER FUNCTION ice_update_alloc() |
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| 64 | !!------------------------------------------------------------------- |
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| 65 | !! *** ROUTINE ice_update_alloc *** |
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| 66 | !!------------------------------------------------------------------- |
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| 67 | ALLOCATE( utau_oce(jpi,jpj), vtau_oce(jpi,jpj), tmod_io(jpi,jpj), STAT=ice_update_alloc ) |
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| 68 | ! |
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| 69 | IF( lk_mpp ) CALL mpp_sum( ice_update_alloc ) |
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| 70 | IF( ice_update_alloc /= 0 ) CALL ctl_warn('ice_update_alloc: failed to allocate arrays') |
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| 71 | ! |
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| 72 | END FUNCTION ice_update_alloc |
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| 73 | |
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| 74 | |
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| 75 | SUBROUTINE ice_update_flx( kt ) |
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| 76 | !!------------------------------------------------------------------- |
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| 77 | !! *** ROUTINE ice_update_flx *** |
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| 78 | !! |
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| 79 | !! ** Purpose : Update the surface ocean boundary condition for heat |
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| 80 | !! salt and mass over areas where sea-ice is non-zero |
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| 81 | !! |
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| 82 | !! ** Action : - computes the heat and freshwater/salt fluxes |
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| 83 | !! at the ice-ocean interface. |
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| 84 | !! - Update the ocean sbc |
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| 85 | !! |
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| 86 | !! ** Outputs : - qsr : sea heat flux: solar |
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| 87 | !! - qns : sea heat flux: non solar |
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| 88 | !! - emp : freshwater budget: volume flux |
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| 89 | !! - sfx : salt flux |
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| 90 | !! - fr_i : ice fraction |
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| 91 | !! - tn_ice : sea-ice surface temperature |
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| 92 | !! - alb_ice : sea-ice albedo (recomputed only for coupled mode) |
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| 93 | !! |
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| 94 | !! References : Goosse, H. et al. 1996, Bul. Soc. Roy. Sc. Liege, 65, 87-90. |
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| 95 | !! Tartinville et al. 2001 Ocean Modelling, 3, 95-108. |
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| 96 | !! These refs are now obsolete since everything has been revised |
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| 97 | !! The ref should be Rousset et al., 2015 |
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| 98 | !!--------------------------------------------------------------------- |
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| 99 | INTEGER, INTENT(in) :: kt ! number of iteration |
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| 100 | ! |
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| 101 | INTEGER :: ji, jj, jl, jk ! dummy loop indices |
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| 102 | REAL(wp) :: zqmass ! Heat flux associated with mass exchange ice->ocean (W.m-2) |
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| 103 | REAL(wp) :: zqsr ! New solar flux received by the ocean |
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| 104 | REAL(wp), DIMENSION(jpi,jpj) :: z2d ! 2D workspace |
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| 105 | REAL(wp), DIMENSION(jpi,jpj,jpl) :: zalb_cs, zalb_os ! 3D workspace |
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| 106 | !!--------------------------------------------------------------------- |
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| 107 | IF( nn_timing == 1 ) CALL timing_start('ice_update') |
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| 108 | |
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| 109 | IF( kt == nit000 .AND. lwp ) THEN |
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| 110 | WRITE(numout,*) |
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| 111 | WRITE(numout,*)'ice_update_flx: update fluxes (mass, salt and heat) at the ice-ocean interface' |
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| 112 | WRITE(numout,*)'~~~~~~~~~~~~~~' |
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| 113 | ENDIF |
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| 114 | |
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| 115 | ! --- case we bypass ice thermodynamics --- ! |
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| 116 | IF( .NOT. ln_icethd ) THEN ! we suppose ice is impermeable => ocean is isolated from atmosphere |
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| 117 | hfx_in (:,:) = ( 1._wp - at_i_b(:,:) ) * ( qns_oce(:,:) + qsr_oce(:,:) ) + qemp_oce(:,:) |
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| 118 | hfx_out (:,:) = ( 1._wp - at_i_b(:,:) ) * qns_oce(:,:) + qemp_oce(:,:) |
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| 119 | ftr_ice (:,:,:) = 0._wp |
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| 120 | emp_ice (:,:) = 0._wp |
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| 121 | qemp_ice (:,:) = 0._wp |
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| 122 | qevap_ice(:,:,:) = 0._wp |
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| 123 | ENDIF |
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| 124 | |
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| 125 | DO jj = 1, jpj |
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| 126 | DO ji = 1, jpi |
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| 127 | |
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| 128 | ! Solar heat flux reaching the ocean = zqsr (W.m-2) |
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| 129 | !--------------------------------------------------- |
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| 130 | zqsr = qsr_tot(ji,jj) - SUM( a_i_b(ji,jj,:) * ( qsr_ice(ji,jj,:) - ftr_ice(ji,jj,:) ) ) |
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| 131 | |
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| 132 | ! Total heat flux reaching the ocean = hfx_out (W.m-2) |
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| 133 | !--------------------------------------------------- |
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| 134 | zqmass = hfx_thd(ji,jj) + hfx_dyn(ji,jj) + hfx_res(ji,jj) ! heat flux from snow is 0 (T=0 degC) |
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| 135 | hfx_out(ji,jj) = hfx_out(ji,jj) + zqmass + zqsr |
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| 136 | |
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| 137 | ! Add the residual from heat diffusion equation and sublimation (W.m-2) |
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| 138 | !---------------------------------------------------------------------- |
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| 139 | hfx_out(ji,jj) = hfx_out(ji,jj) + hfx_err_dif(ji,jj) + & |
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| 140 | & ( hfx_sub(ji,jj) - SUM( qevap_ice(ji,jj,:) * a_i_b(ji,jj,:) ) ) |
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| 141 | |
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| 142 | ! New qsr and qns used to compute the oceanic heat flux at the next time step |
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| 143 | !---------------------------------------------------------------------------- |
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| 144 | qsr(ji,jj) = zqsr |
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| 145 | qns(ji,jj) = hfx_out(ji,jj) - zqsr |
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| 146 | |
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| 147 | ! Mass flux at the atm. surface |
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| 148 | !----------------------------------- |
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| 149 | wfx_sub(ji,jj) = wfx_snw_sub(ji,jj) + wfx_ice_sub(ji,jj) |
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| 150 | |
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| 151 | ! Mass flux at the ocean surface |
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| 152 | !------------------------------------ |
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| 153 | ! case of realistic freshwater flux (Tartinville et al., 2001) (presently ACTIVATED) |
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| 154 | ! ------------------------------------------------------------------------------------- |
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| 155 | ! The idea of this approach is that the system that we consider is the ICE-OCEAN system |
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| 156 | ! Thus FW flux = External ( E-P+snow melt) |
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| 157 | ! Salt flux = Exchanges in the ice-ocean system then converted into FW |
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| 158 | ! Associated to Ice formation AND Ice melting |
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| 159 | ! Even if i see Ice melting as a FW and SALT flux |
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| 160 | ! |
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| 161 | ! mass flux from ice/ocean |
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| 162 | wfx_ice(ji,jj) = wfx_bog(ji,jj) + wfx_bom(ji,jj) + wfx_sum(ji,jj) + wfx_sni(ji,jj) & |
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| 163 | & + wfx_opw(ji,jj) + wfx_dyn(ji,jj) + wfx_res(ji,jj) + wfx_lam(ji,jj) + wfx_pnd(ji,jj) |
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| 164 | |
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| 165 | ! add the snow melt water to snow mass flux to the ocean |
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| 166 | wfx_snw(ji,jj) = wfx_snw_sni(ji,jj) + wfx_snw_dyn(ji,jj) + wfx_snw_sum(ji,jj) |
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| 167 | |
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| 168 | ! mass flux at the ocean/ice interface |
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| 169 | fmmflx(ji,jj) = - ( wfx_ice(ji,jj) + wfx_snw(ji,jj) + wfx_err_sub(ji,jj) ) ! F/M mass flux save at least for biogeochemical model |
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| 170 | emp(ji,jj) = emp_oce(ji,jj) - wfx_ice(ji,jj) - wfx_snw(ji,jj) - wfx_err_sub(ji,jj) ! mass flux + F/M mass flux (always ice/ocean mass exchange) |
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| 171 | |
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| 172 | |
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| 173 | ! Salt flux at the ocean surface |
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| 174 | !------------------------------------------ |
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| 175 | 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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| 176 | & + sfx_res(ji,jj) + sfx_dyn(ji,jj) + sfx_bri(ji,jj) + sfx_sub(ji,jj) + sfx_lam(ji,jj) |
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| 177 | |
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| 178 | ! Mass of snow and ice per unit area |
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| 179 | !---------------------------------------- |
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| 180 | snwice_mass_b(ji,jj) = snwice_mass(ji,jj) ! save mass from the previous ice time step |
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| 181 | ! ! new mass per unit area |
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| 182 | snwice_mass (ji,jj) = tmask(ji,jj,1) * ( rhosn * vt_s(ji,jj) + rhoic * vt_i(ji,jj) ) |
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| 183 | ! ! time evolution of snow+ice mass |
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| 184 | snwice_fmass (ji,jj) = ( snwice_mass(ji,jj) - snwice_mass_b(ji,jj) ) * r1_rdtice |
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| 185 | |
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| 186 | END DO |
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| 187 | END DO |
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| 188 | |
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| 189 | ! Storing the transmitted variables |
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| 190 | !---------------------------------- |
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| 191 | fr_i (:,:) = at_i(:,:) ! Sea-ice fraction |
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| 192 | tn_ice(:,:,:) = t_su(:,:,:) ! Ice surface temperature |
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| 193 | |
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| 194 | ! Snow/ice albedo (only if sent to coupler, useless in forced mode) |
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| 195 | !------------------------------------------------------------------ |
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| 196 | CALL ice_alb( t_su, h_i, h_s, ln_pnd_alb, a_ip_frac, h_ip, zalb_cs, zalb_os ) ! cloud-sky and overcast-sky ice albedos |
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| 197 | ! |
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| 198 | alb_ice(:,:,:) = ( 1._wp - cldf_ice ) * zalb_cs(:,:,:) + cldf_ice * zalb_os(:,:,:) |
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| 199 | ! |
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| 200 | IF( lrst_ice ) THEN !* write snwice_mass fields in the restart file |
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| 201 | CALL update_rst( 'WRITE', kt ) |
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| 202 | ENDIF |
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| 203 | ! |
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| 204 | ! output all fluxes |
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| 205 | !------------------ |
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| 206 | ! |
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| 207 | ! --- salt fluxes [kg/m2/s] --- ! |
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| 208 | ! ! sfxice = sfxbog + sfxbom + sfxsum + sfxsni + sfxopw + sfxres + sfxdyn + sfxbri + sfxsub + sfxlam |
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| 209 | IF( iom_use('sfxice' ) ) CALL iom_put( "sfxice", sfx * 1.e-03 ) ! salt flux from total ice growth/melt |
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| 210 | IF( iom_use('sfxbog' ) ) CALL iom_put( "sfxbog", sfx_bog * 1.e-03 ) ! salt flux from bottom growth |
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| 211 | IF( iom_use('sfxbom' ) ) CALL iom_put( "sfxbom", sfx_bom * 1.e-03 ) ! salt flux from bottom melting |
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| 212 | IF( iom_use('sfxsum' ) ) CALL iom_put( "sfxsum", sfx_sum * 1.e-03 ) ! salt flux from surface melting |
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| 213 | IF( iom_use('sfxlam' ) ) CALL iom_put( "sfxlam", sfx_lam * 1.e-03 ) ! salt flux from lateral melting |
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| 214 | IF( iom_use('sfxsni' ) ) CALL iom_put( "sfxsni", sfx_sni * 1.e-03 ) ! salt flux from snow ice formation |
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| 215 | IF( iom_use('sfxopw' ) ) CALL iom_put( "sfxopw", sfx_opw * 1.e-03 ) ! salt flux from open water formation |
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| 216 | IF( iom_use('sfxdyn' ) ) CALL iom_put( "sfxdyn", sfx_dyn * 1.e-03 ) ! salt flux from ridging rafting |
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| 217 | IF( iom_use('sfxbri' ) ) CALL iom_put( "sfxbri", sfx_bri * 1.e-03 ) ! salt flux from brines |
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| 218 | IF( iom_use('sfxres' ) ) CALL iom_put( "sfxres", sfx_res * 1.e-03 ) ! salt flux from undiagnosed processes |
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| 219 | IF( iom_use('sfxsub' ) ) CALL iom_put( "sfxsub", sfx_sub * 1.e-03 ) ! salt flux from sublimation |
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| 220 | |
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| 221 | ! --- mass fluxes [kg/m2/s] --- ! |
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| 222 | IF( iom_use('emp_oce' ) ) CALL iom_put( "emp_oce", emp_oce ) ! emp over ocean (taking into account the snow blown away from the ice) |
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| 223 | IF( iom_use('emp_ice' ) ) CALL iom_put( "emp_ice", emp_ice ) ! emp over ice (taking into account the snow blown away from the ice) |
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| 224 | |
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| 225 | ! ! vfxice = vfxbog + vfxbom + vfxsum + vfxsni + vfxopw + vfxdyn + vfxres + vfxlam + vfxpnd |
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| 226 | IF( iom_use('vfxice' ) ) CALL iom_put( "vfxice" , wfx_ice ) ! mass flux from total ice growth/melt |
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| 227 | IF( iom_use('vfxbog' ) ) CALL iom_put( "vfxbog" , wfx_bog ) ! mass flux from bottom growth |
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| 228 | IF( iom_use('vfxbom' ) ) CALL iom_put( "vfxbom" , wfx_bom ) ! mass flux from bottom melt |
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| 229 | IF( iom_use('vfxsum' ) ) CALL iom_put( "vfxsum" , wfx_sum ) ! mass flux from surface melt |
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| 230 | IF( iom_use('vfxlam' ) ) CALL iom_put( "vfxlam" , wfx_lam ) ! mass flux from lateral melt |
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| 231 | IF( iom_use('vfxsni' ) ) CALL iom_put( "vfxsni" , wfx_sni ) ! mass flux from snow-ice formation |
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| 232 | IF( iom_use('vfxopw' ) ) CALL iom_put( "vfxopw" , wfx_opw ) ! mass flux from growth in open water |
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| 233 | IF( iom_use('vfxdyn' ) ) CALL iom_put( "vfxdyn" , wfx_dyn ) ! mass flux from dynamics (ridging) |
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| 234 | IF( iom_use('vfxres' ) ) CALL iom_put( "vfxres" , wfx_res ) ! mass flux from undiagnosed processes |
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| 235 | IF( iom_use('vfxpnd' ) ) CALL iom_put( "vfxpnd" , wfx_pnd ) ! mass flux from melt ponds |
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| 236 | IF( iom_use('vfxsub' ) ) CALL iom_put( "vfxsub" , wfx_ice_sub ) ! mass flux from ice sublimation (ice-atm.) |
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| 237 | IF( iom_use('vfxsub_err') ) CALL iom_put( "vfxsub_err", wfx_err_sub ) ! "excess" of sublimation sent to ocean |
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| 238 | |
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| 239 | IF ( iom_use( "vfxthin" ) ) THEN ! mass flux from ice growth in open water + thin ice (<20cm) => comparable to observations |
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| 240 | WHERE( hm_i(:,:) < 0.2 .AND. hm_i(:,:) > 0. ) ; z2d = wfx_bog |
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| 241 | ELSEWHERE ; z2d = 0._wp |
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| 242 | END WHERE |
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| 243 | CALL iom_put( "vfxthin", wfx_opw + z2d ) |
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| 244 | ENDIF |
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| 245 | |
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| 246 | ! ! vfxsnw = vfxsnw_sni + vfxsnw_dyn + vfxsnw_sum |
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| 247 | IF( iom_use('vfxsnw' ) ) CALL iom_put( "vfxsnw" , wfx_snw ) ! mass flux from total snow growth/melt |
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| 248 | IF( iom_use('vfxsnw_sum' ) ) CALL iom_put( "vfxsnw_sum" , wfx_snw_sum ) ! mass flux from snow melt at the surface |
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| 249 | IF( iom_use('vfxsnw_sni' ) ) CALL iom_put( "vfxsnw_sni" , wfx_snw_sni ) ! mass flux from snow melt during snow-ice formation |
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| 250 | IF( iom_use('vfxsnw_dyn' ) ) CALL iom_put( "vfxsnw_dyn" , wfx_snw_dyn ) ! mass flux from dynamics (ridging) |
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| 251 | IF( iom_use('vfxsnw_sub' ) ) CALL iom_put( "vfxsnw_sub" , wfx_snw_sub ) ! mass flux from snow sublimation (ice-atm.) |
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| 252 | IF( iom_use('vfxsnw_pre' ) ) CALL iom_put( "vfxsnw_pre" , wfx_spr ) ! snow precip |
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| 253 | |
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| 254 | ! --- heat fluxes [W/m2] --- ! |
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| 255 | ! ! qt_atm_oi - qt_oce_ai = hfxdhc - ( dihctrp + dshctrp ) |
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| 256 | 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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| 257 | 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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| 258 | 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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| 259 | 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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| 260 | IF( iom_use('qtr_ice_bot') ) CALL iom_put( "qtr_ice_bot", SUM( ftr_ice * a_i_b, dim=3 ) ) ! solar flux transmitted thru ice |
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| 261 | IF( iom_use('qtr_ice_top') ) CALL iom_put( "qtr_ice_top", SUM( qsr_ice_tr * a_i_b, dim=3 ) ) ! solar flux transmitted thru ice surface |
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| 262 | 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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| 263 | 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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| 264 | IF( iom_use('qt_oce_ai' ) ) CALL iom_put( "qt_oce_ai" , hfx_out * tmask(:,:,1) ) ! total heat flux at the ocean surface: interface oce-(ice+atm) |
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| 265 | IF( iom_use('qt_atm_oi' ) ) CALL iom_put( "qt_atm_oi" , hfx_in * tmask(:,:,1) ) ! total heat flux at the oce-ice surface: interface atm-(ice+oce) |
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| 266 | IF( iom_use('qemp_oce' ) ) CALL iom_put( "qemp_oce" , qemp_oce ) ! Downward Heat Flux from E-P over ocean |
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| 267 | IF( iom_use('qemp_ice' ) ) CALL iom_put( "qemp_ice" , qemp_ice ) ! Downward Heat Flux from E-P over ice |
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| 268 | |
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| 269 | ! heat fluxes from ice transformations |
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| 270 | ! ! hfxdhc = hfxbog + hfxbom + hfxsum + hfxopw + hfxdif + hfxsnw - ( hfxthd + hfxdyn + hfxres + hfxsub + hfxspr ) |
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| 271 | IF( iom_use('hfxbog' ) ) CALL iom_put ("hfxbog" , hfx_bog ) ! heat flux used for ice bottom growth |
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| 272 | IF( iom_use('hfxbom' ) ) CALL iom_put ("hfxbom" , hfx_bom ) ! heat flux used for ice bottom melt |
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| 273 | IF( iom_use('hfxsum' ) ) CALL iom_put ("hfxsum" , hfx_sum ) ! heat flux used for ice surface growth |
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| 274 | IF( iom_use('hfxopw' ) ) CALL iom_put ("hfxopw" , hfx_opw ) ! heat flux used for ice formation in open water |
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| 275 | IF( iom_use('hfxdif' ) ) CALL iom_put ("hfxdif" , hfx_dif ) ! heat flux used for ice temperature change |
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| 276 | IF( iom_use('hfxsnw' ) ) CALL iom_put ("hfxsnw" , hfx_snw ) ! heat flux used for snow melt |
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| 277 | IF( iom_use('hfxerr' ) ) CALL iom_put ("hfxerr" , hfx_err_dif ) ! heat flux error after heat diffusion (included in hfx_out) |
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| 278 | |
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| 279 | ! heat fluxes associated with mass exchange (freeze/melt/precip...) |
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| 280 | IF( iom_use('hfxthd' ) ) CALL iom_put ("hfxthd" , hfx_thd ) ! |
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| 281 | IF( iom_use('hfxdyn' ) ) CALL iom_put ("hfxdyn" , hfx_dyn ) ! |
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| 282 | IF( iom_use('hfxres' ) ) CALL iom_put ("hfxres" , hfx_res ) ! |
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| 283 | IF( iom_use('hfxsub' ) ) CALL iom_put ("hfxsub" , hfx_sub ) ! |
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| 284 | IF( iom_use('hfxspr' ) ) CALL iom_put ("hfxspr" , hfx_spr ) ! Heat flux from snow precip heat content |
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| 285 | |
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| 286 | ! other heat fluxes |
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| 287 | IF( iom_use('hfxsensib' ) ) CALL iom_put( "hfxsensib" , -fhtur * at_i_b ) ! Sensible oceanic heat flux |
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| 288 | IF( iom_use('hfxcndbot' ) ) CALL iom_put( "hfxcndbot" , diag_fc_bo * at_i_b ) ! Bottom conduction flux |
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| 289 | IF( iom_use('hfxcndtop' ) ) CALL iom_put( "hfxcndtop" , diag_fc_su * at_i_b ) ! Surface conduction flux |
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| 290 | |
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| 291 | ! diags |
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| 292 | IF( iom_use('hfxdhc' ) ) CALL iom_put ("hfxdhc" , diag_heat ) ! Heat content variation in snow and ice |
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| 293 | ! |
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| 294 | ! controls |
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| 295 | !--------- |
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| 296 | IF( ln_icediachk .AND. .NOT. ln_bdy) CALL ice_cons_final('iceupdate') ! conservation |
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| 297 | IF( ln_icectl ) CALL ice_prt (kt, iiceprt, jiceprt, 3, 'Final state ice_update') ! prints |
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| 298 | IF( ln_ctl ) CALL ice_prt3D ('iceupdate') ! prints |
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| 299 | IF( nn_timing == 1 ) CALL timing_stop ('ice_update') ! timing |
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| 300 | ! |
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| 301 | END SUBROUTINE ice_update_flx |
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| 302 | |
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| 303 | |
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| 304 | SUBROUTINE ice_update_tau( kt, pu_oce, pv_oce ) |
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| 305 | !!------------------------------------------------------------------- |
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| 306 | !! *** ROUTINE ice_update_tau *** |
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| 307 | !! |
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| 308 | !! ** Purpose : Update the ocean surface stresses due to the ice |
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| 309 | !! |
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| 310 | !! ** Action : * at each ice time step (every nn_fsbc time step): |
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| 311 | !! - compute the modulus of ice-ocean relative velocity |
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| 312 | !! (*rho*Cd) at T-point (C-grid) or I-point (B-grid) |
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| 313 | !! tmod_io = rhoco * | U_ice-U_oce | |
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| 314 | !! - update the modulus of stress at ocean surface |
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| 315 | !! taum = (1-a) * taum + a * tmod_io * | U_ice-U_oce | |
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| 316 | !! * at each ocean time step (every kt): |
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| 317 | !! compute linearized ice-ocean stresses as |
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| 318 | !! Utau = tmod_io * | U_ice - pU_oce | |
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| 319 | !! using instantaneous current ocean velocity (usually before) |
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| 320 | !! |
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| 321 | !! NB: - ice-ocean rotation angle no more allowed |
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| 322 | !! - here we make an approximation: taum is only computed every ice time step |
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| 323 | !! This avoids mutiple average to pass from T -> U,V grids and next from U,V grids |
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| 324 | !! to T grid. taum is used in TKE and GLS, which should not be too sensitive to this approximaton... |
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| 325 | !! |
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| 326 | !! ** Outputs : - utau, vtau : surface ocean i- and j-stress (u- & v-pts) updated with ice-ocean fluxes |
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| 327 | !! - taum : modulus of the surface ocean stress (T-point) updated with ice-ocean fluxes |
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| 328 | !!--------------------------------------------------------------------- |
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| 329 | INTEGER , INTENT(in) :: kt ! ocean time-step index |
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| 330 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: pu_oce, pv_oce ! surface ocean currents |
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| 331 | ! |
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| 332 | INTEGER :: ji, jj ! dummy loop indices |
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| 333 | REAL(wp) :: zat_u, zutau_ice, zu_t, zmodt ! local scalar |
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| 334 | REAL(wp) :: zat_v, zvtau_ice, zv_t, zrhoco ! - - |
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| 335 | !!--------------------------------------------------------------------- |
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| 336 | |
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| 337 | IF( nn_timing == 1 ) CALL timing_start('ice_update_tau') |
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| 338 | |
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| 339 | IF( kt == nit000 .AND. lwp ) THEN |
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| 340 | WRITE(numout,*) |
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| 341 | WRITE(numout,*)'ice_update_tau: update stress at the ice-ocean interface' |
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| 342 | WRITE(numout,*)'~~~~~~~~~~~~~~' |
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| 343 | ENDIF |
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| 344 | |
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| 345 | zrhoco = rau0 * rn_cio |
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| 346 | ! |
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| 347 | IF( MOD( kt-1, nn_fsbc ) == 0 ) THEN !== Ice time-step only ==! (i.e. surface module time-step) |
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| 348 | DO jj = 2, jpjm1 !* update the modulus of stress at ocean surface (T-point) |
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| 349 | DO ji = fs_2, fs_jpim1 |
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| 350 | ! ! 2*(U_ice-U_oce) at T-point |
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| 351 | zu_t = u_ice(ji,jj) + u_ice(ji-1,jj) - u_oce(ji,jj) - u_oce(ji-1,jj) |
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| 352 | zv_t = v_ice(ji,jj) + v_ice(ji,jj-1) - v_oce(ji,jj) - v_oce(ji,jj-1) |
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| 353 | ! ! |U_ice-U_oce|^2 |
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| 354 | zmodt = 0.25_wp * ( zu_t * zu_t + zv_t * zv_t ) |
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| 355 | ! ! update the ocean stress modulus |
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| 356 | taum(ji,jj) = ( 1._wp - at_i(ji,jj) ) * taum(ji,jj) + at_i(ji,jj) * zrhoco * zmodt |
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| 357 | tmod_io(ji,jj) = zrhoco * SQRT( zmodt ) ! rhoco * |U_ice-U_oce| at T-point |
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| 358 | END DO |
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| 359 | END DO |
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| 360 | CALL lbc_lnk_multi( taum, 'T', 1., tmod_io, 'T', 1. ) |
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| 361 | ! |
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| 362 | utau_oce(:,:) = utau(:,:) !* save the air-ocean stresses at ice time-step |
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| 363 | vtau_oce(:,:) = vtau(:,:) |
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| 364 | ! |
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| 365 | ENDIF |
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| 366 | ! |
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| 367 | ! !== every ocean time-step ==! |
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| 368 | ! |
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| 369 | DO jj = 2, jpjm1 !* update the stress WITHOUT an ice-ocean rotation angle |
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| 370 | DO ji = fs_2, fs_jpim1 ! Vect. Opt. |
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| 371 | zat_u = ( at_i(ji,jj) + at_i(ji+1,jj) ) * 0.5_wp ! ice area at u and V-points |
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| 372 | zat_v = ( at_i(ji,jj) + at_i(ji,jj+1) ) * 0.5_wp |
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| 373 | ! ! linearized quadratic drag formulation |
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| 374 | zutau_ice = 0.5_wp * ( tmod_io(ji,jj) + tmod_io(ji+1,jj) ) * ( u_ice(ji,jj) - pu_oce(ji,jj) ) |
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| 375 | zvtau_ice = 0.5_wp * ( tmod_io(ji,jj) + tmod_io(ji,jj+1) ) * ( v_ice(ji,jj) - pv_oce(ji,jj) ) |
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| 376 | ! ! stresses at the ocean surface |
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| 377 | utau(ji,jj) = ( 1._wp - zat_u ) * utau_oce(ji,jj) + zat_u * zutau_ice |
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| 378 | vtau(ji,jj) = ( 1._wp - zat_v ) * vtau_oce(ji,jj) + zat_v * zvtau_ice |
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| 379 | END DO |
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| 380 | END DO |
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| 381 | CALL lbc_lnk_multi( utau, 'U', -1., vtau, 'V', -1. ) ! lateral boundary condition |
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| 382 | ! |
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| 383 | IF( nn_timing == 1 ) CALL timing_stop('ice_update_tau') |
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| 384 | ! |
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| 385 | END SUBROUTINE ice_update_tau |
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| 386 | |
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| 387 | |
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| 388 | SUBROUTINE ice_update_init |
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| 389 | !!------------------------------------------------------------------- |
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| 390 | !! *** ROUTINE ice_update_init *** |
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| 391 | !! |
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| 392 | !! ** Purpose : ??? |
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| 393 | !! |
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| 394 | !!------------------------------------------------------------------- |
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| 395 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 396 | REAL(wp) :: zcoefu, zcoefv, zcoeff ! local scalar |
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| 397 | !!------------------------------------------------------------------- |
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| 398 | ! |
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| 399 | IF(lwp) WRITE(numout,*) |
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| 400 | IF(lwp) WRITE(numout,*) 'ice_update_init: ???? ' |
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| 401 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~~~~' |
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| 402 | |
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| 403 | ! ! allocate ice_update array |
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| 404 | IF( ice_update_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'ice_update_init : unable to allocate standard arrays' ) |
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| 405 | ! |
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| 406 | CALL update_rst( 'READ' ) !* read or initialize all required files |
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| 407 | ! |
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| 408 | END SUBROUTINE ice_update_init |
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| 409 | |
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| 410 | SUBROUTINE update_rst( cdrw, kt ) |
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| 411 | !!--------------------------------------------------------------------- |
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| 412 | !! *** ROUTINE rhg_evp_rst *** |
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| 413 | !! |
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| 414 | !! ** Purpose : Read or write RHG file in restart file |
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| 415 | !! |
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| 416 | !! ** Method : use of IOM library |
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| 417 | !!---------------------------------------------------------------------- |
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| 418 | CHARACTER(len=*) , INTENT(in) :: cdrw ! "READ"/"WRITE" flag |
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| 419 | INTEGER, OPTIONAL, INTENT(in) :: kt ! ice time-step |
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| 420 | ! |
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| 421 | INTEGER :: iter ! local integer |
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| 422 | INTEGER :: id1 ! local integer |
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| 423 | !!---------------------------------------------------------------------- |
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| 424 | ! |
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| 425 | IF( TRIM(cdrw) == 'READ' ) THEN ! Read/initialize |
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| 426 | ! ! --------------- |
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| 427 | IF( ln_rstart ) THEN !* Read the restart file |
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| 428 | ! |
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| 429 | id1 = iom_varid( numrir, 'snwice_mass' , ldstop = .FALSE. ) |
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| 430 | ! |
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| 431 | IF( id1 > 0 ) THEN ! fields exist |
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| 432 | CALL iom_get( numrir, jpdom_autoglo, 'snwice_mass' , snwice_mass ) |
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| 433 | CALL iom_get( numrir, jpdom_autoglo, 'snwice_mass_b', snwice_mass_b ) |
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| 434 | ELSE ! start from rest |
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| 435 | IF(lwp) WRITE(numout,*) ' ==>> previous run without snow-ice mass output then set it' |
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| 436 | snwice_mass (:,:) = tmask(:,:,1) * ( rhosn * vt_s(:,:) + rhoic * vt_i(:,:) ) |
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| 437 | snwice_mass_b(:,:) = snwice_mass(:,:) |
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| 438 | ENDIF |
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| 439 | ELSE !* Start from rest |
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| 440 | IF(lwp) WRITE(numout,*) ' ==>> start from rest: set the snow-ice mass' |
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| 441 | snwice_mass (:,:) = tmask(:,:,1) * ( rhosn * vt_s(:,:) + rhoic * vt_i(:,:) ) |
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| 442 | snwice_mass_b(:,:) = snwice_mass(:,:) |
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| 443 | ENDIF |
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| 444 | ! |
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| 445 | ELSEIF( TRIM(cdrw) == 'WRITE' ) THEN ! Create restart file |
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| 446 | ! ! ------------------- |
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| 447 | IF(lwp) WRITE(numout,*) '---- update-rst ----' |
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| 448 | iter = kt + nn_fsbc - 1 ! ice restarts are written at kt == nitrst - nn_fsbc + 1 |
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| 449 | ! |
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| 450 | CALL iom_rstput( iter, nitrst, numriw, 'snwice_mass' , snwice_mass ) |
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| 451 | CALL iom_rstput( iter, nitrst, numriw, 'snwice_mass_b', snwice_mass_b ) |
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| 452 | ! |
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| 453 | ENDIF |
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| 454 | ! |
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| 455 | END SUBROUTINE update_rst |
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| 456 | |
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| 457 | #else |
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| 458 | !!---------------------------------------------------------------------- |
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| 459 | !! Default option Dummy module NO ESIM sea-ice model |
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| 460 | !!---------------------------------------------------------------------- |
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| 461 | #endif |
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| 462 | |
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| 463 | !!====================================================================== |
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| 464 | END MODULE iceupdate |
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