| 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 | !!gm It should be probably better to pass these variable in argument of the routine, |
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| 30 | !!gm rather than having this long list in USE. This will also highlight what is updated, and what is just use. |
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| 31 | USE sbc_ice |
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| 32 | USE sbc_oce |
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| 33 | !!gm end |
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| 34 | USE sbccpl ! Surface boundary condition: coupled interface |
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| 35 | USE icealb ! sea-ice: albedo parameters |
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| 36 | USE traqsr ! add penetration of solar flux in the calculation of heat budget |
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| 37 | USE icectl ! sea-ice: control prints |
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| 38 | USE bdy_oce , ONLY : ln_bdy |
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| 39 | ! |
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| 40 | USE in_out_manager ! I/O manager |
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| 41 | USE iom ! I/O manager library |
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| 42 | USE lib_mpp ! MPP library |
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| 43 | USE lib_fortran ! fortran utilities (glob_sum + no signed zero) |
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| 44 | USE lbclnk ! lateral boundary conditions (or mpp links) |
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| 45 | USE timing ! Timing |
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| 46 | |
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| 47 | IMPLICIT NONE |
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| 48 | PRIVATE |
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| 49 | |
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| 50 | PUBLIC ice_update_init ! called by ice_init |
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| 51 | PUBLIC ice_update_flx ! called by ice_stp |
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| 52 | PUBLIC ice_update_tau ! called by ice_stp |
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| 53 | |
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| 54 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: utau_oce, vtau_oce ! air-ocean surface i- & j-stress [N/m2] |
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| 55 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: tmod_io ! modulus of the ice-ocean velocity [m/s] |
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| 56 | |
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| 57 | !! * Substitutions |
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| 58 | # include "vectopt_loop_substitute.h90" |
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| 59 | !!---------------------------------------------------------------------- |
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| 60 | !! NEMO/ICE 4.0 , NEMO Consortium (2017) |
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| 61 | !! $Id: iceupdate.F90 8411 2017-08-07 16:09:12Z clem $ |
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| 62 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 63 | !!---------------------------------------------------------------------- |
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| 64 | CONTAINS |
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| 65 | |
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| 66 | INTEGER FUNCTION ice_update_alloc() |
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| 67 | !!------------------------------------------------------------------- |
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| 68 | !! *** ROUTINE ice_update_alloc *** |
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| 69 | !!------------------------------------------------------------------- |
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| 70 | ALLOCATE( utau_oce(jpi,jpj), vtau_oce(jpi,jpj), tmod_io(jpi,jpj), STAT=ice_update_alloc ) |
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| 71 | ! |
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| 72 | IF( lk_mpp ) CALL mpp_sum( ice_update_alloc ) |
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| 73 | IF( ice_update_alloc /= 0 ) CALL ctl_warn('ice_update_alloc: failed to allocate arrays') |
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| 74 | ! |
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| 75 | END FUNCTION ice_update_alloc |
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| 76 | |
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| 77 | |
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| 78 | SUBROUTINE ice_update_flx( kt ) |
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| 79 | !!------------------------------------------------------------------- |
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| 80 | !! *** ROUTINE ice_update_flx *** |
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| 81 | !! |
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| 82 | !! ** Purpose : Update the surface ocean boundary condition for heat |
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| 83 | !! salt and mass over areas where sea-ice is non-zero |
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| 84 | !! |
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| 85 | !! ** Action : - computes the heat and freshwater/salt fluxes |
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| 86 | !! at the ice-ocean interface. |
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| 87 | !! - Update the ocean sbc |
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| 88 | !! |
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| 89 | !! ** Outputs : - qsr : sea heat flux: solar |
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| 90 | !! - qns : sea heat flux: non solar |
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| 91 | !! - emp : freshwater budget: volume flux |
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| 92 | !! - sfx : salt flux |
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| 93 | !! - fr_i : ice fraction |
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| 94 | !! - tn_ice : sea-ice surface temperature |
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| 95 | !! - alb_ice : sea-ice albedo (recomputed only for coupled mode) |
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| 96 | !! |
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| 97 | !! References : Goosse, H. et al. 1996, Bul. Soc. Roy. Sc. Liege, 65, 87-90. |
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| 98 | !! Tartinville et al. 2001 Ocean Modelling, 3, 95-108. |
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| 99 | !! These refs are now obsolete since everything has been revised |
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| 100 | !! The ref should be Rousset et al., 2015 |
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| 101 | !!--------------------------------------------------------------------- |
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| 102 | INTEGER, INTENT(in) :: kt ! number of iteration |
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| 103 | ! |
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| 104 | INTEGER :: ji, jj, jl, jk ! dummy loop indices |
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| 105 | REAL(wp) :: zqmass ! Heat flux associated with mass exchange ice->ocean (W.m-2) |
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| 106 | REAL(wp) :: zqsr ! New solar flux received by the ocean |
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| 107 | REAL(wp), DIMENSION(jpi,jpj) :: z2d ! 2D workspace |
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| 108 | REAL(wp), DIMENSION(jpi,jpj,jpl) :: zalb_cs, zalb_os ! 3D workspace |
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| 109 | !!--------------------------------------------------------------------- |
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| 110 | IF( nn_timing == 1 ) CALL timing_start('ice_update') |
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| 111 | |
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| 112 | IF( kt == nit000 .AND. lwp ) THEN |
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| 113 | WRITE(numout,*) |
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| 114 | WRITE(numout,*)'ice_update_flx: update fluxes (mass, salt and heat) at the ice-ocean interface' |
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| 115 | WRITE(numout,*)'~~~~~~~~~~~~~~' |
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| 116 | ENDIF |
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| 117 | |
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| 118 | ! --- case we bypass ice thermodynamics --- ! |
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| 119 | IF( .NOT. ln_icethd ) THEN ! we suppose ice is impermeable => ocean is isolated from atmosphere |
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| 120 | hfx_in (:,:) = ( 1._wp - at_i_b(:,:) ) * ( qns_oce(:,:) + qsr_oce(:,:) ) + qemp_oce(:,:) |
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| 121 | hfx_out (:,:) = ( 1._wp - at_i_b(:,:) ) * qns_oce(:,:) + qemp_oce(:,:) |
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| 122 | ftr_ice (:,:,:) = 0._wp |
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| 123 | emp_ice (:,:) = 0._wp |
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| 124 | qemp_ice (:,:) = 0._wp |
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| 125 | qevap_ice(:,:,:) = 0._wp |
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| 126 | ENDIF |
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| 127 | |
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| 128 | DO jj = 1, jpj |
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| 129 | DO ji = 1, jpi |
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| 130 | |
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| 131 | ! Solar heat flux reaching the ocean = zqsr (W.m-2) |
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| 132 | !--------------------------------------------------- |
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| 133 | zqsr = qsr_tot(ji,jj) - SUM( a_i_b(ji,jj,:) * ( qsr_ice(ji,jj,:) - ftr_ice(ji,jj,:) ) ) |
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| 134 | |
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| 135 | ! Total heat flux reaching the ocean = hfx_out (W.m-2) |
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| 136 | !--------------------------------------------------- |
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| 137 | 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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| 138 | hfx_out(ji,jj) = hfx_out(ji,jj) + zqmass + zqsr |
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| 139 | |
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| 140 | ! Add the residual from heat diffusion equation and sublimation (W.m-2) |
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| 141 | !---------------------------------------------------------------------- |
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| 142 | hfx_out(ji,jj) = hfx_out(ji,jj) + hfx_err_dif(ji,jj) + & |
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| 143 | & ( hfx_sub(ji,jj) - SUM( qevap_ice(ji,jj,:) * a_i_b(ji,jj,:) ) ) |
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| 144 | |
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| 145 | ! New qsr and qns used to compute the oceanic heat flux at the next time step |
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| 146 | !---------------------------------------------------------------------------- |
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| 147 | qsr(ji,jj) = zqsr |
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| 148 | qns(ji,jj) = hfx_out(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 | ! case of realistic freshwater flux (Tartinville et al., 2001) (presently ACTIVATED) |
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| 157 | ! ------------------------------------------------------------------------------------- |
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| 158 | ! The idea of this approach is that the system that we consider is the ICE-OCEAN system |
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| 159 | ! Thus FW flux = External ( E-P+snow melt) |
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| 160 | ! Salt flux = Exchanges in the ice-ocean system then converted into FW |
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| 161 | ! Associated to Ice formation AND Ice melting |
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| 162 | ! Even if i see Ice melting as a FW and SALT flux |
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| 163 | ! |
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| 164 | ! mass flux from ice/ocean |
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| 165 | wfx_ice(ji,jj) = wfx_bog(ji,jj) + wfx_bom(ji,jj) + wfx_sum(ji,jj) + wfx_sni(ji,jj) & |
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| 166 | & + wfx_opw(ji,jj) + wfx_dyn(ji,jj) + wfx_res(ji,jj) + wfx_lam(ji,jj) |
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| 167 | |
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| 168 | IF ( ln_pnd_fw ) wfx_ice(ji,jj) = wfx_ice(ji,jj) + wfx_pnd(ji,jj) |
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| 169 | |
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| 170 | ! add the snow melt water to snow mass flux to the ocean |
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| 171 | wfx_snw(ji,jj) = wfx_snw_sni(ji,jj) + wfx_snw_dyn(ji,jj) + wfx_snw_sum(ji,jj) |
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| 172 | |
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| 173 | ! mass flux at the ocean/ice interface |
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| 174 | 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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| 175 | 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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| 176 | |
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| 177 | |
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| 178 | ! Salt flux at the ocean surface |
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| 179 | !------------------------------------------ |
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| 180 | 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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| 181 | & + sfx_res(ji,jj) + sfx_dyn(ji,jj) + sfx_bri(ji,jj) + sfx_sub(ji,jj) + sfx_lam(ji,jj) |
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| 182 | |
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| 183 | ! Mass of snow and ice per unit area |
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| 184 | !---------------------------------------- |
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| 185 | snwice_mass_b(ji,jj) = snwice_mass(ji,jj) ! save mass from the previous ice time step |
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| 186 | ! ! new mass per unit area |
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| 187 | snwice_mass (ji,jj) = tmask(ji,jj,1) * ( rhosn * vt_s(ji,jj) + rhoic * vt_i(ji,jj) ) |
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| 188 | ! ! time evolution of snow+ice mass |
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| 189 | snwice_fmass (ji,jj) = ( snwice_mass(ji,jj) - snwice_mass_b(ji,jj) ) * r1_rdtice |
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| 190 | |
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| 191 | END DO |
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| 192 | END DO |
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| 193 | |
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| 194 | ! Storing the transmitted variables |
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| 195 | !---------------------------------- |
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| 196 | fr_i (:,:) = at_i(:,:) ! Sea-ice fraction |
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| 197 | tn_ice(:,:,:) = t_su(:,:,:) ! Ice surface temperature |
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| 198 | |
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| 199 | ! Snow/ice albedo (only if sent to coupler, useless in forced mode) |
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| 200 | !------------------------------------------------------------------ |
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| 201 | CALL ice_alb( t_su, h_i, h_s, a_ip_frac, h_ip, ln_pnd_rad, zalb_cs, zalb_os ) ! cloud-sky and overcast-sky ice albedos |
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| 202 | ! |
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| 203 | alb_ice(:,:,:) = ( 1._wp - cldf_ice ) * zalb_cs(:,:,:) + cldf_ice * zalb_os(:,:,:) |
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| 204 | ! |
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| 205 | IF( lrst_ice ) THEN !* write snwice_mass fields in the restart file |
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| 206 | CALL update_rst( 'WRITE', kt ) |
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| 207 | ENDIF |
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| 208 | ! |
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| 209 | ! output all fluxes |
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| 210 | !------------------ |
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| 211 | 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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| 212 | 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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| 213 | 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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| 214 | 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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| 215 | IF( iom_use('qtr_ice') ) CALL iom_put( "qtr_ice" , SUM( ftr_ice(:,:,:) * a_i_b(:,:,:), dim=3 ) ) ! solar flux transmitted thru ice |
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| 216 | 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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| 217 | IF( iom_use('qt_ice' ) ) CALL iom_put( "qt_ice" , SUM( ( qns_ice(:,:,:) + qsr_ice(:,:,:) ) & |
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| 218 | & * a_i_b(:,:,:), dim=3 ) + qemp_ice(:,:) ) |
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| 219 | !!gm I don't understand the variable below.... why not multiplied by a_i_b or (1-a_i_b) ??? |
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| 220 | IF( iom_use('qemp_oce') ) CALL iom_put( "qemp_oce" , qemp_oce(:,:) ) |
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| 221 | IF( iom_use('qemp_ice') ) CALL iom_put( "qemp_ice" , qemp_ice(:,:) ) |
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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 | CALL iom_put( "snowpre" , sprecip * 86400. ) ! snow precipitation [m/day] |
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| 226 | |
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| 227 | CALL iom_put( "sfxbog" , sfx_bog ) ! salt flux from bottom growth |
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| 228 | CALL iom_put( "sfxbom" , sfx_bom ) ! salt flux from bottom melting |
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| 229 | CALL iom_put( "sfxsum" , sfx_sum ) ! salt flux from surface melting |
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| 230 | CALL iom_put( "sfxlam" , sfx_lam ) ! salt flux from lateral melting |
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| 231 | CALL iom_put( "sfxsni" , sfx_sni ) ! salt flux from snow ice formation |
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| 232 | CALL iom_put( "sfxopw" , sfx_opw ) ! salt flux from open water formation |
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| 233 | CALL iom_put( "sfxdyn" , sfx_dyn ) ! salt flux from ridging rafting |
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| 234 | CALL iom_put( "sfxres" , sfx_res ) ! salt flux from corrections (resultant) |
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| 235 | CALL iom_put( "sfxbri" , sfx_bri ) ! salt flux from brines |
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| 236 | CALL iom_put( "sfxsub" , sfx_sub ) ! salt flux from sublimation |
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| 237 | CALL iom_put( "sfx" , sfx ) ! total salt flux |
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| 238 | |
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| 239 | CALL iom_put( "vfxres" , wfx_res ) ! prod./melting due to corrections |
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| 240 | CALL iom_put( "vfxopw" , wfx_opw ) ! lateral thermodynamic ice production |
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| 241 | CALL iom_put( "vfxsni" , wfx_sni ) ! snowice ice production |
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| 242 | CALL iom_put( "vfxbog" , wfx_bog ) ! bottom thermodynamic ice production |
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| 243 | CALL iom_put( "vfxdyn" , wfx_dyn ) ! dynamic ice production (rid/raft) |
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| 244 | CALL iom_put( "vfxsum" , wfx_sum ) ! surface melt |
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| 245 | CALL iom_put( "vfxbom" , wfx_bom ) ! bottom melt |
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| 246 | CALL iom_put( "vfxlam" , wfx_lam ) ! lateral melt |
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| 247 | CALL iom_put( "vfxice" , wfx_ice ) ! total ice growth/melt |
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| 248 | IF ( ln_pnd ) CALL iom_put( "vfxpnd", wfx_pnd ) ! melt pond water flux |
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| 249 | |
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| 250 | IF ( iom_use( "vfxthin" ) ) THEN ! ice production for open water + thin ice (<20cm) => comparable to observations |
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| 251 | WHERE( hm_i(:,:) < 0.2 .AND. hm_i(:,:) > 0. ) ; z2d = wfx_bog |
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| 252 | ELSEWHERE ; z2d = 0._wp |
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| 253 | END WHERE |
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| 254 | CALL iom_put( "vfxthin", ( wfx_opw + z2d ) ) |
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| 255 | ENDIF |
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| 256 | |
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| 257 | CALL iom_put( "vfxspr" , wfx_spr ) ! precip (snow) |
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| 258 | CALL iom_put( "vfxsnw" , wfx_snw ) ! total snw growth/melt |
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| 259 | CALL iom_put( "vfxsub" , wfx_sub ) ! sublimation (snow/ice) |
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| 260 | CALL iom_put( "vfxsub_err" , wfx_err_sub ) ! "excess" of sublimation sent to ocean |
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| 261 | |
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| 262 | CALL iom_put ('hfxthd' , hfx_thd(:,:) ) ! |
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| 263 | CALL iom_put ('hfxdyn' , hfx_dyn(:,:) ) ! |
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| 264 | CALL iom_put ('hfxres' , hfx_res(:,:) ) ! |
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| 265 | CALL iom_put ('hfxout' , hfx_out(:,:) ) ! |
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| 266 | CALL iom_put ('hfxin' , hfx_in(:,:) ) ! |
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| 267 | CALL iom_put ('hfxsnw' , hfx_snw(:,:) ) ! |
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| 268 | CALL iom_put ('hfxsub' , hfx_sub(:,:) ) ! |
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| 269 | CALL iom_put ('hfxerr' , hfx_err_dif(:,:) ) ! |
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| 270 | CALL iom_put ('hfxerr_rem' , hfx_err_rem(:,:) ) ! |
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| 271 | |
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| 272 | CALL iom_put ('hfxsum' , hfx_sum(:,:) ) ! |
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| 273 | CALL iom_put ('hfxbom' , hfx_bom(:,:) ) ! |
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| 274 | CALL iom_put ('hfxbog' , hfx_bog(:,:) ) ! |
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| 275 | CALL iom_put ('hfxdif' , hfx_dif(:,:) ) ! |
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| 276 | CALL iom_put ('hfxopw' , hfx_opw(:,:) ) ! |
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| 277 | CALL iom_put ('hfxtur' , fhtur(:,:) * at_i_b(:,:) ) ! turbulent heat flux at ice base |
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| 278 | CALL iom_put ('hfxdhc' , diag_heat(:,:) ) ! Heat content variation in snow and ice |
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| 279 | CALL iom_put ('hfxspr' , hfx_spr(:,:) ) ! Heat content of snow precip |
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| 280 | ! |
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| 281 | ! controls |
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| 282 | !--------- |
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| 283 | IF( ln_icediachk .AND. .NOT. ln_bdy) CALL ice_cons_final('iceupdate') ! conservation |
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| 284 | IF( ln_icectl ) CALL ice_prt (kt, iiceprt, jiceprt, 3, 'Final state ice_update') ! prints |
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| 285 | IF( ln_ctl ) CALL ice_prt3D ('iceupdate') ! prints |
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| 286 | IF( nn_timing == 1 ) CALL timing_stop ('ice_update') ! timing |
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| 287 | ! |
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| 288 | END SUBROUTINE ice_update_flx |
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| 289 | |
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| 290 | |
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| 291 | SUBROUTINE ice_update_tau( kt, pu_oce, pv_oce ) |
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| 292 | !!------------------------------------------------------------------- |
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| 293 | !! *** ROUTINE ice_update_tau *** |
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| 294 | !! |
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| 295 | !! ** Purpose : Update the ocean surface stresses due to the ice |
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| 296 | !! |
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| 297 | !! ** Action : * at each ice time step (every nn_fsbc time step): |
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| 298 | !! - compute the modulus of ice-ocean relative velocity |
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| 299 | !! (*rho*Cd) at T-point (C-grid) or I-point (B-grid) |
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| 300 | !! tmod_io = rhoco * | U_ice-U_oce | |
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| 301 | !! - update the modulus of stress at ocean surface |
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| 302 | !! taum = (1-a) * taum + a * tmod_io * | U_ice-U_oce | |
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| 303 | !! * at each ocean time step (every kt): |
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| 304 | !! compute linearized ice-ocean stresses as |
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| 305 | !! Utau = tmod_io * | U_ice - pU_oce | |
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| 306 | !! using instantaneous current ocean velocity (usually before) |
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| 307 | !! |
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| 308 | !! NB: - ice-ocean rotation angle no more allowed |
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| 309 | !! - here we make an approximation: taum is only computed every ice time step |
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| 310 | !! This avoids mutiple average to pass from T -> U,V grids and next from U,V grids |
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| 311 | !! to T grid. taum is used in TKE and GLS, which should not be too sensitive to this approximaton... |
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| 312 | !! |
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| 313 | !! ** Outputs : - utau, vtau : surface ocean i- and j-stress (u- & v-pts) updated with ice-ocean fluxes |
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| 314 | !! - taum : modulus of the surface ocean stress (T-point) updated with ice-ocean fluxes |
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| 315 | !!--------------------------------------------------------------------- |
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| 316 | INTEGER , INTENT(in) :: kt ! ocean time-step index |
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| 317 | REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: pu_oce, pv_oce ! surface ocean currents |
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| 318 | ! |
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| 319 | INTEGER :: ji, jj ! dummy loop indices |
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| 320 | REAL(wp) :: zat_u, zutau_ice, zu_t, zmodt ! local scalar |
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| 321 | REAL(wp) :: zat_v, zvtau_ice, zv_t, zrhoco ! - - |
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| 322 | !!--------------------------------------------------------------------- |
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| 323 | |
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| 324 | IF( nn_timing == 1 ) CALL timing_start('ice_update') |
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| 325 | |
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| 326 | IF( kt == nit000 .AND. lwp ) THEN |
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| 327 | WRITE(numout,*) |
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| 328 | WRITE(numout,*)'ice_update_tau: update stress at the ice-ocean interface' |
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| 329 | WRITE(numout,*)'~~~~~~~~~~~~~~' |
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| 330 | ENDIF |
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| 331 | |
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| 332 | zrhoco = rau0 * rn_cio |
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| 333 | ! |
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| 334 | IF( MOD( kt-1, nn_fsbc ) == 0 ) THEN !== Ice time-step only ==! (i.e. surface module time-step) |
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| 335 | DO jj = 2, jpjm1 !* update the modulus of stress at ocean surface (T-point) |
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| 336 | DO ji = fs_2, fs_jpim1 |
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| 337 | ! ! 2*(U_ice-U_oce) at T-point |
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| 338 | zu_t = u_ice(ji,jj) + u_ice(ji-1,jj) - u_oce(ji,jj) - u_oce(ji-1,jj) |
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| 339 | zv_t = v_ice(ji,jj) + v_ice(ji,jj-1) - v_oce(ji,jj) - v_oce(ji,jj-1) |
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| 340 | ! ! |U_ice-U_oce|^2 |
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| 341 | zmodt = 0.25_wp * ( zu_t * zu_t + zv_t * zv_t ) |
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| 342 | ! ! update the ocean stress modulus |
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| 343 | taum(ji,jj) = ( 1._wp - at_i(ji,jj) ) * taum(ji,jj) + at_i(ji,jj) * zrhoco * zmodt |
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| 344 | tmod_io(ji,jj) = zrhoco * SQRT( zmodt ) ! rhoco * |U_ice-U_oce| at T-point |
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| 345 | END DO |
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| 346 | END DO |
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| 347 | CALL lbc_lnk_multi( taum, 'T', 1., tmod_io, 'T', 1. ) |
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| 348 | ! |
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| 349 | utau_oce(:,:) = utau(:,:) !* save the air-ocean stresses at ice time-step |
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| 350 | vtau_oce(:,:) = vtau(:,:) |
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| 351 | ! |
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| 352 | ENDIF |
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| 353 | ! |
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| 354 | ! !== every ocean time-step ==! |
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| 355 | ! |
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| 356 | DO jj = 2, jpjm1 !* update the stress WITHOUT an ice-ocean rotation angle |
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| 357 | DO ji = fs_2, fs_jpim1 ! Vect. Opt. |
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| 358 | 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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| 359 | zat_v = ( at_i(ji,jj) + at_i(ji,jj+1) ) * 0.5_wp |
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| 360 | ! ! linearized quadratic drag formulation |
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| 361 | 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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| 362 | 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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| 363 | ! ! stresses at the ocean surface |
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| 364 | utau(ji,jj) = ( 1._wp - zat_u ) * utau_oce(ji,jj) + zat_u * zutau_ice |
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| 365 | vtau(ji,jj) = ( 1._wp - zat_v ) * vtau_oce(ji,jj) + zat_v * zvtau_ice |
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| 366 | END DO |
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| 367 | END DO |
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| 368 | CALL lbc_lnk_multi( utau, 'U', -1., vtau, 'V', -1. ) ! lateral boundary condition |
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| 369 | ! |
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| 370 | IF( nn_timing == 1 ) CALL timing_stop('ice_update') |
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| 371 | ! |
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| 372 | END SUBROUTINE ice_update_tau |
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| 373 | |
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| 374 | |
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| 375 | SUBROUTINE ice_update_init |
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| 376 | !!------------------------------------------------------------------- |
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| 377 | !! *** ROUTINE ice_update_init *** |
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| 378 | !! |
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| 379 | !! ** Purpose : ??? |
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| 380 | !! |
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| 381 | !!------------------------------------------------------------------- |
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| 382 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 383 | REAL(wp) :: zcoefu, zcoefv, zcoeff ! local scalar |
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| 384 | !!------------------------------------------------------------------- |
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| 385 | ! |
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| 386 | IF(lwp) WRITE(numout,*) |
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| 387 | IF(lwp) WRITE(numout,*) 'ice_update_init: ???? ' |
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| 388 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~~~~' |
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| 389 | |
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| 390 | ! ! allocate ice_update array |
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| 391 | IF( ice_update_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'ice_update_init : unable to allocate standard arrays' ) |
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| 392 | ! |
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| 393 | CALL update_rst( 'READ' ) !* read or initialize all required files |
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| 394 | ! |
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| 395 | END SUBROUTINE ice_update_init |
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| 396 | |
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| 397 | SUBROUTINE update_rst( cdrw, kt ) |
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| 398 | !!--------------------------------------------------------------------- |
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| 399 | !! *** ROUTINE rhg_evp_rst *** |
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| 400 | !! |
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| 401 | !! ** Purpose : Read or write RHG file in restart file |
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| 402 | !! |
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| 403 | !! ** Method : use of IOM library |
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| 404 | !!---------------------------------------------------------------------- |
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| 405 | CHARACTER(len=*) , INTENT(in) :: cdrw ! "READ"/"WRITE" flag |
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| 406 | INTEGER, OPTIONAL, INTENT(in) :: kt ! ice time-step |
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| 407 | ! |
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| 408 | INTEGER :: iter ! local integer |
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| 409 | INTEGER :: id1 ! local integer |
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| 410 | !!---------------------------------------------------------------------- |
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| 411 | ! |
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| 412 | IF( TRIM(cdrw) == 'READ' ) THEN ! Read/initialize |
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| 413 | ! ! --------------- |
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| 414 | IF( ln_rstart ) THEN !* Read the restart file |
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| 415 | ! |
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| 416 | id1 = iom_varid( numrir, 'snwice_mass' , ldstop = .FALSE. ) |
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| 417 | ! |
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| 418 | IF( id1 > 0 ) THEN ! fields exist |
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| 419 | CALL iom_get( numrir, jpdom_autoglo, 'snwice_mass' , snwice_mass ) |
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| 420 | CALL iom_get( numrir, jpdom_autoglo, 'snwice_mass_b', snwice_mass_b ) |
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| 421 | ELSE ! start from rest |
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| 422 | IF(lwp) WRITE(numout,*) ' ==>> previous run without snow-ice mass output then set it' |
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| 423 | snwice_mass (:,:) = tmask(:,:,1) * ( rhosn * vt_s(:,:) + rhoic * vt_i(:,:) ) |
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| 424 | snwice_mass_b(:,:) = snwice_mass(:,:) |
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| 425 | ENDIF |
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| 426 | ELSE !* Start from rest |
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| 427 | IF(lwp) WRITE(numout,*) ' ==>> start from rest: set the snow-ice mass' |
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| 428 | snwice_mass (:,:) = tmask(:,:,1) * ( rhosn * vt_s(:,:) + rhoic * vt_i(:,:) ) |
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| 429 | snwice_mass_b(:,:) = snwice_mass(:,:) |
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| 430 | ENDIF |
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| 431 | ! |
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| 432 | ELSEIF( TRIM(cdrw) == 'WRITE' ) THEN ! Create restart file |
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| 433 | ! ! ------------------- |
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| 434 | IF(lwp) WRITE(numout,*) '---- update-rst ----' |
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| 435 | iter = kt + nn_fsbc - 1 ! ice restarts are written at kt == nitrst - nn_fsbc + 1 |
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| 436 | ! |
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| 437 | CALL iom_rstput( iter, nitrst, numriw, 'snwice_mass' , snwice_mass ) |
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| 438 | CALL iom_rstput( iter, nitrst, numriw, 'snwice_mass_b', snwice_mass_b ) |
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| 439 | ! |
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| 440 | ENDIF |
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| 441 | ! |
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| 442 | END SUBROUTINE update_rst |
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| 443 | |
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| 444 | #else |
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| 445 | !!---------------------------------------------------------------------- |
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| 446 | !! Default option Dummy module NO ESIM sea-ice model |
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| 447 | !!---------------------------------------------------------------------- |
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| 448 | #endif |
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| 449 | |
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| 450 | !!====================================================================== |
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| 451 | END MODULE iceupdate |
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