| [3] | 1 | MODULE trasbc |
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| 2 | !!============================================================================== |
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| 3 | !! *** MODULE trasbc *** |
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| 4 | !! Ocean active tracers: surface boundary condition |
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| 5 | !!============================================================================== |
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| [2528] | 6 | !! History : OPA ! 1998-10 (G. Madec, G. Roullet, M. Imbard) Original code |
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| 7 | !! 8.2 ! 2001-02 (D. Ludicone) sea ice and free surface |
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| 8 | !! NEMO 1.0 ! 2002-06 (G. Madec) F90: Free form and module |
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| 9 | !! 3.3 ! 2010-04 (M. Leclair, G. Madec) Forcing averaged over 2 time steps |
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| 10 | !! - ! 2010-09 (C. Ethe, G. Madec) Merge TRA-TRC |
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| [5120] | 11 | !! 3.6 ! 2014-11 (P. Mathiot) isf melting forcing |
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| [3] | 12 | !!---------------------------------------------------------------------- |
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| [503] | 13 | |
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| 14 | !!---------------------------------------------------------------------- |
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| [3] | 15 | !! tra_sbc : update the tracer trend at ocean surface |
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| 16 | !!---------------------------------------------------------------------- |
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| 17 | USE oce ! ocean dynamics and active tracers |
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| [888] | 18 | USE sbc_oce ! surface boundary condition: ocean |
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| [3] | 19 | USE dom_oce ! ocean space domain variables |
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| 20 | USE phycst ! physical constant |
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| [4990] | 21 | USE sbcmod ! ln_rnf |
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| 22 | USE sbcrnf ! River runoff |
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| [5431] | 23 | USE sbcisf ! Ice shelf |
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| [216] | 24 | USE traqsr ! solar radiation penetration |
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| [4990] | 25 | USE trd_oce ! trends: ocean variables |
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| 26 | USE trdtra ! trends manager: tracers |
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| 27 | ! |
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| [3] | 28 | USE in_out_manager ! I/O manager |
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| [258] | 29 | USE prtctl ! Print control |
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| [2528] | 30 | USE iom |
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| 31 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| [3294] | 32 | USE wrk_nemo ! Memory Allocation |
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| 33 | USE timing ! Timing |
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| [4990] | 34 | USE eosbn2 |
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| [8400] | 35 | #if defined key_asminc |
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| 36 | USE asminc ! Assimilation increment |
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| 37 | #endif |
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| [3] | 38 | |
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| 39 | IMPLICIT NONE |
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| 40 | PRIVATE |
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| 41 | |
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| [503] | 42 | PUBLIC tra_sbc ! routine called by step.F90 |
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| [3] | 43 | |
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| 44 | !! * Substitutions |
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| 45 | # include "domzgr_substitute.h90" |
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| 46 | # include "vectopt_loop_substitute.h90" |
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| 47 | !!---------------------------------------------------------------------- |
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| [4990] | 48 | !! NEMO/OPA 3.7 , NEMO Consortium (2014) |
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| [888] | 49 | !! $Id$ |
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| [2715] | 50 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| [3] | 51 | !!---------------------------------------------------------------------- |
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| 52 | CONTAINS |
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| 53 | |
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| 54 | SUBROUTINE tra_sbc ( kt ) |
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| 55 | !!---------------------------------------------------------------------- |
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| 56 | !! *** ROUTINE tra_sbc *** |
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| 57 | !! |
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| 58 | !! ** Purpose : Compute the tracer surface boundary condition trend of |
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| 59 | !! (flux through the interface, concentration/dilution effect) |
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| 60 | !! and add it to the general trend of tracer equations. |
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| 61 | !! |
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| 62 | !! ** Method : |
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| [664] | 63 | !! Following Roullet and Madec (2000), the air-sea flux can be divided |
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| 64 | !! into three effects: (1) Fext, external forcing; |
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| 65 | !! (2) Fwi, concentration/dilution effect due to water exchanged |
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| 66 | !! at the surface by evaporation, precipitations and runoff (E-P-R); |
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| 67 | !! (3) Fwe, tracer carried with the water that is exchanged. |
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| [3625] | 68 | !! - salinity : salt flux only due to freezing/melting |
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| 69 | !! sa = sa + sfx / rau0 / e3t for k=1 |
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| [664] | 70 | !! |
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| 71 | !! Fext, flux through the air-sea interface for temperature and salt: |
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| [3] | 72 | !! - temperature : heat flux q (w/m2). If penetrative solar |
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| 73 | !! radiation q is only the non solar part of the heat flux, the |
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| 74 | !! solar part is added in traqsr.F routine. |
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| 75 | !! ta = ta + q /(rau0 rcp e3t) for k=1 |
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| 76 | !! - salinity : no salt flux |
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| [664] | 77 | !! |
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| 78 | !! The formulation for Fwb and Fwi vary according to the free |
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| 79 | !! surface formulation (linear or variable volume). |
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| 80 | !! * Linear free surface |
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| 81 | !! The surface freshwater flux modifies the ocean volume |
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| [3] | 82 | !! and thus the concentration of a tracer and the temperature. |
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| 83 | !! First order of the effect of surface freshwater exchange |
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| 84 | !! for salinity, it can be neglected on temperature (especially |
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| [664] | 85 | !! as the temperature of precipitations and runoffs is usually |
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| 86 | !! unknown). |
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| [3] | 87 | !! - temperature : we assume that the temperature of both |
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| 88 | !! precipitations and runoffs is equal to the SST, thus there |
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| 89 | !! is no additional flux since in this case, the concentration |
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| 90 | !! dilution effect is balanced by the net heat flux associated |
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| [664] | 91 | !! to the freshwater exchange (Fwe+Fwi=0): |
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| 92 | !! (Tp P - Te E) + SST (P-E) = 0 when Tp=Te=SST |
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| [3] | 93 | !! - salinity : evaporation, precipitation and runoff |
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| [3625] | 94 | !! water has a zero salinity but there is a salt flux due to |
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| 95 | !! freezing/melting, thus: |
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| 96 | !! sa = sa + emp * sn / rau0 / e3t for k=1 |
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| 97 | !! + sfx / rau0 / e3t |
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| [3] | 98 | !! where emp, the surface freshwater budget (evaporation minus |
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| 99 | !! precipitation minus runoff) given in kg/m2/s is divided |
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| [4990] | 100 | !! by rau0 (density of sea water) to obtain m/s. |
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| [664] | 101 | !! Note: even though Fwe does not appear explicitly for |
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| 102 | !! temperature in this routine, the heat carried by the water |
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| 103 | !! exchanged through the surface is part of the total heat flux |
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| 104 | !! forcing and must be taken into account in the global heat |
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| 105 | !! balance). |
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| 106 | !! * nonlinear free surface (variable volume, lk_vvl) |
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| 107 | !! contrary to the linear free surface case, Fwi is properly |
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| 108 | !! taken into account by using the true layer thicknesses to |
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| 109 | !! calculate tracer content and advection. There is no need to |
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| 110 | !! deal with it in this routine. |
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| 111 | !! - temperature: Fwe=SST (P-E+R) is added to Fext. |
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| 112 | !! - salinity: Fwe = 0, there is no surface flux of salt. |
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| [3] | 113 | !! |
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| 114 | !! ** Action : - Update the 1st level of (ta,sa) with the trend associated |
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| 115 | !! with the tracer surface boundary condition |
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| [4990] | 116 | !! - send trends to trdtra module (l_trdtra=T) |
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| [503] | 117 | !!---------------------------------------------------------------------- |
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| [2528] | 118 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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| [3] | 119 | !! |
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| [2528] | 120 | INTEGER :: ji, jj, jk, jn ! dummy loop indices |
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| [4990] | 121 | INTEGER :: ikt, ikb |
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| 122 | INTEGER :: nk_isf |
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| [3625] | 123 | REAL(wp) :: zfact, z1_e3t, zdep |
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| [4990] | 124 | REAL(wp) :: zalpha, zhk |
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| [8400] | 125 | REAL(wp) :: zt_frz, zpress |
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| [3294] | 126 | REAL(wp), POINTER, DIMENSION(:,:,:) :: ztrdt, ztrds |
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| [3] | 127 | !!---------------------------------------------------------------------- |
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| [3294] | 128 | ! |
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| 129 | IF( nn_timing == 1 ) CALL timing_start('tra_sbc') |
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| 130 | ! |
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| [3] | 131 | IF( kt == nit000 ) THEN |
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| 132 | IF(lwp) WRITE(numout,*) |
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| 133 | IF(lwp) WRITE(numout,*) 'tra_sbc : TRAcer Surface Boundary Condition' |
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| 134 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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| 135 | ENDIF |
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| 136 | |
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| [4990] | 137 | IF( l_trdtra ) THEN !* Save ta and sa trends |
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| [3294] | 138 | CALL wrk_alloc( jpi, jpj, jpk, ztrdt, ztrds ) |
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| 139 | ztrdt(:,:,:) = tsa(:,:,:,jp_tem) |
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| 140 | ztrds(:,:,:) = tsa(:,:,:,jp_sal) |
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| [216] | 141 | ENDIF |
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| 142 | |
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| [2528] | 143 | !!gm IF( .NOT.ln_traqsr ) qsr(:,:) = 0.e0 ! no solar radiation penetration |
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| 144 | IF( .NOT.ln_traqsr ) THEN ! no solar radiation penetration |
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| 145 | qns(:,:) = qns(:,:) + qsr(:,:) ! total heat flux in qns |
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| 146 | qsr(:,:) = 0.e0 ! qsr set to zero |
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| 147 | ENDIF |
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| [3] | 148 | |
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| [2528] | 149 | !---------------------------------------- |
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| [4990] | 150 | ! EMP, SFX and QNS effects |
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| [2528] | 151 | !---------------------------------------- |
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| 152 | ! Set before sbc tracer content fields |
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| 153 | ! ************************************ |
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| 154 | IF( kt == nit000 ) THEN ! Set the forcing field at nit000 - 1 |
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| 155 | ! ! ----------------------------------- |
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| 156 | IF( ln_rstart .AND. & ! Restart: read in restart file |
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| 157 | & iom_varid( numror, 'sbc_hc_b', ldstop = .FALSE. ) > 0 ) THEN |
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| 158 | IF(lwp) WRITE(numout,*) ' nit000-1 surface tracer content forcing fields red in the restart file' |
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| [4990] | 159 | zfact = 0.5_wp |
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| [2528] | 160 | CALL iom_get( numror, jpdom_autoglo, 'sbc_hc_b', sbc_tsc_b(:,:,jp_tem) ) ! before heat content sbc trend |
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| 161 | CALL iom_get( numror, jpdom_autoglo, 'sbc_sc_b', sbc_tsc_b(:,:,jp_sal) ) ! before salt content sbc trend |
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| 162 | ELSE ! No restart or restart not found: Euler forward time stepping |
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| [4990] | 163 | zfact = 1._wp |
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| [6793] | 164 | sbc_tsc(:,:,:) = 0._wp |
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| [4990] | 165 | sbc_tsc_b(:,:,:) = 0._wp |
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| [2528] | 166 | ENDIF |
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| 167 | ELSE ! Swap of forcing fields |
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| 168 | ! ! ---------------------- |
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| [4990] | 169 | zfact = 0.5_wp |
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| [2528] | 170 | sbc_tsc_b(:,:,:) = sbc_tsc(:,:,:) |
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| 171 | ENDIF |
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| 172 | ! Compute now sbc tracer content fields |
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| 173 | ! ************************************* |
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| 174 | |
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| 175 | ! Concentration dilution effect on (t,s) due to |
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| 176 | ! evaporation, precipitation and qns, but not river runoff |
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| 177 | |
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| [3625] | 178 | IF( lk_vvl ) THEN ! Variable Volume case ==>> heat content of mass flux is in qns |
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| [3294] | 179 | DO jj = 1, jpj |
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| 180 | DO ji = 1, jpi |
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| [3625] | 181 | sbc_tsc(ji,jj,jp_tem) = r1_rau0_rcp * qns(ji,jj) ! non solar heat flux |
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| 182 | sbc_tsc(ji,jj,jp_sal) = r1_rau0 * sfx(ji,jj) ! salt flux due to freezing/melting |
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| [2528] | 183 | END DO |
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| [3] | 184 | END DO |
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| [3625] | 185 | ELSE ! Constant Volume case ==>> Concentration dilution effect |
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| [2528] | 186 | DO jj = 2, jpj |
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| 187 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 188 | ! temperature : heat flux |
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| [3625] | 189 | sbc_tsc(ji,jj,jp_tem) = r1_rau0_rcp * qns(ji,jj) & ! non solar heat flux |
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| 190 | & + r1_rau0 * emp(ji,jj) * tsn(ji,jj,1,jp_tem) ! concent./dilut. effect |
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| 191 | ! salinity : salt flux + concent./dilut. effect (both in sfx) |
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| 192 | sbc_tsc(ji,jj,jp_sal) = r1_rau0 * ( sfx(ji,jj) & ! salt flux (freezing/melting) |
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| 193 | & + emp(ji,jj) * tsn(ji,jj,1,jp_sal) ) ! concent./dilut. effect |
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| [2528] | 194 | END DO |
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| 195 | END DO |
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| [4990] | 196 | IF( iom_use('emp_x_sst') ) CALL iom_put( "emp_x_sst", emp (:,:) * tsn(:,:,1,jp_tem) ) ! c/d term on sst |
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| 197 | IF( iom_use('emp_x_sss') ) CALL iom_put( "emp_x_sss", emp (:,:) * tsn(:,:,1,jp_sal) ) ! c/d term on sss |
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| [2528] | 198 | ENDIF |
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| 199 | ! Concentration dilution effect on (t,s) due to evapouration, precipitation and qns, but not river runoff |
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| 200 | DO jn = 1, jpts |
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| 201 | DO jj = 2, jpj |
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| 202 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 203 | z1_e3t = zfact / fse3t(ji,jj,1) |
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| 204 | tsa(ji,jj,1,jn) = tsa(ji,jj,1,jn) + ( sbc_tsc_b(ji,jj,jn) + sbc_tsc(ji,jj,jn) ) * z1_e3t |
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| 205 | END DO |
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| 206 | END DO |
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| [3] | 207 | END DO |
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| [2528] | 208 | ! Write in the ocean restart file |
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| 209 | ! ******************************* |
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| 210 | IF( lrst_oce ) THEN |
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| 211 | IF(lwp) WRITE(numout,*) |
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| 212 | IF(lwp) WRITE(numout,*) 'sbc : ocean surface tracer content forcing fields written in ocean restart file ', & |
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| 213 | & 'at it= ', kt,' date= ', ndastp |
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| 214 | IF(lwp) WRITE(numout,*) '~~~~' |
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| [9321] | 215 | IF(nn_timing == 2) CALL timing_start('iom_rstput') |
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| [2528] | 216 | CALL iom_rstput( kt, nitrst, numrow, 'sbc_hc_b', sbc_tsc(:,:,jp_tem) ) |
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| 217 | CALL iom_rstput( kt, nitrst, numrow, 'sbc_sc_b', sbc_tsc(:,:,jp_sal) ) |
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| [9321] | 218 | IF(nn_timing == 2) CALL timing_stop('iom_rstput') |
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| [2528] | 219 | ENDIF |
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| 220 | ! |
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| [4990] | 221 | ! |
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| [2528] | 222 | !---------------------------------------- |
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| [4990] | 223 | ! Ice Shelf effects (ISF) |
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| 224 | ! tbl treated as in Losh (2008) JGR |
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| 225 | !---------------------------------------- |
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| 226 | ! |
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| 227 | IF( nn_isf > 0 ) THEN |
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| 228 | zfact = 0.5e0 |
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| 229 | DO jj = 2, jpj |
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| 230 | DO ji = fs_2, fs_jpim1 |
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| 231 | |
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| 232 | ikt = misfkt(ji,jj) |
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| 233 | ikb = misfkb(ji,jj) |
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| 234 | |
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| 235 | ! level fully include in the ice shelf boundary layer |
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| 236 | ! if isfdiv, we have to remove heat flux due to inflow at 0oC (as in rnf when you add rnf at sst) |
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| 237 | ! sign - because fwf sign of evapo (rnf sign of precip) |
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| 238 | DO jk = ikt, ikb - 1 |
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| 239 | ! compute tfreez for the temperature correction (we add water at freezing temperature) |
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| 240 | ! compute trend |
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| 241 | tsa(ji,jj,jk,jp_tem) = tsa(ji,jj,jk,jp_tem) & |
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| [6487] | 242 | & + zfact * (risf_tsc_b(ji,jj,jp_tem) + risf_tsc(ji,jj,jp_tem)) * r1_hisf_tbl(ji,jj) |
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| [4990] | 243 | tsa(ji,jj,jk,jp_sal) = tsa(ji,jj,jk,jp_sal) & |
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| 244 | & + zfact * (risf_tsc_b(ji,jj,jp_sal) + risf_tsc(ji,jj,jp_sal)) * r1_hisf_tbl(ji,jj) |
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| 245 | END DO |
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| 246 | |
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| 247 | ! level partially include in ice shelf boundary layer |
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| 248 | ! compute tfreez for the temperature correction (we add water at freezing temperature) |
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| 249 | ! compute trend |
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| 250 | tsa(ji,jj,ikb,jp_tem) = tsa(ji,jj,ikb,jp_tem) & |
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| [6487] | 251 | & + zfact * (risf_tsc_b(ji,jj,jp_tem) + risf_tsc(ji,jj,jp_tem)) * r1_hisf_tbl(ji,jj) * ralpha(ji,jj) |
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| [4990] | 252 | tsa(ji,jj,ikb,jp_sal) = tsa(ji,jj,ikb,jp_sal) & |
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| 253 | & + zfact * (risf_tsc_b(ji,jj,jp_sal) + risf_tsc(ji,jj,jp_sal)) * r1_hisf_tbl(ji,jj) * ralpha(ji,jj) |
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| 254 | END DO |
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| 255 | END DO |
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| 256 | IF( lrst_oce ) THEN |
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| 257 | IF(lwp) WRITE(numout,*) |
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| 258 | IF(lwp) WRITE(numout,*) 'sbc : isf surface tracer content forcing fields written in ocean restart file ', & |
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| 259 | & 'at it= ', kt,' date= ', ndastp |
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| 260 | IF(lwp) WRITE(numout,*) '~~~~' |
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| [9321] | 261 | IF(nn_timing == 2) CALL timing_start('iom_rstput') |
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| [4990] | 262 | CALL iom_rstput( kt, nitrst, numrow, 'fwf_isf_b', fwfisf(:,:) ) |
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| 263 | CALL iom_rstput( kt, nitrst, numrow, 'isf_hc_b' , risf_tsc(:,:,jp_tem) ) |
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| 264 | CALL iom_rstput( kt, nitrst, numrow, 'isf_sc_b' , risf_tsc(:,:,jp_sal) ) |
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| [9321] | 265 | IF(nn_timing == 2) CALL timing_stop('iom_rstput') |
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| [4990] | 266 | ENDIF |
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| 267 | END IF |
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| 268 | ! |
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| 269 | !---------------------------------------- |
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| [2528] | 270 | ! River Runoff effects |
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| 271 | !---------------------------------------- |
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| 272 | ! |
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| [3764] | 273 | IF( ln_rnf ) THEN ! input of heat and salt due to river runoff |
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| 274 | zfact = 0.5_wp |
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| [2528] | 275 | DO jj = 2, jpj |
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| 276 | DO ji = fs_2, fs_jpim1 |
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| [3764] | 277 | IF( rnf(ji,jj) /= 0._wp ) THEN |
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| 278 | zdep = zfact / h_rnf(ji,jj) |
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| [2528] | 279 | DO jk = 1, nk_rnf(ji,jj) |
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| 280 | tsa(ji,jj,jk,jp_tem) = tsa(ji,jj,jk,jp_tem) & |
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| 281 | & + ( rnf_tsc_b(ji,jj,jp_tem) + rnf_tsc(ji,jj,jp_tem) ) * zdep |
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| 282 | IF( ln_rnf_sal ) tsa(ji,jj,jk,jp_sal) = tsa(ji,jj,jk,jp_sal) & |
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| 283 | & + ( rnf_tsc_b(ji,jj,jp_sal) + rnf_tsc(ji,jj,jp_sal) ) * zdep |
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| [2715] | 284 | END DO |
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| [2528] | 285 | ENDIF |
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| [2715] | 286 | END DO |
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| 287 | END DO |
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| [3764] | 288 | ENDIF |
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| [7993] | 289 | |
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| 290 | IF( iom_use('rnf_x_sst') ) CALL iom_put( "rnf_x_sst", rnf*tsn(:,:,1,jp_tem) ) ! runoff term on sst |
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| 291 | IF( iom_use('rnf_x_sss') ) CALL iom_put( "rnf_x_sss", rnf*tsn(:,:,1,jp_sal) ) ! runoff term on sss |
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| 292 | |
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| [8400] | 293 | #if defined key_asminc |
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| 294 | ! WARNING: THIS MAY WELL NOT BE REQUIRED - WE DON'T WANT TO CHANGE T&S BUT THIS MAY COMPENSATE ANOTHER TERM... |
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| 295 | ! Rate of change in e3t for each level is ssh_iau*e3t_0/ht_0 |
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| 296 | ! Contribution to tsa should be rate of change in level / per m of ocean? (hence the division by fse3t_n) |
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| 297 | IF( ln_sshinc ) THEN ! input of heat and salt due to assimilation |
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| 298 | DO jj = 2, jpj |
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| 299 | DO ji = fs_2, fs_jpim1 |
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| 300 | zdep = ssh_iau(ji,jj) / ( ht_0(ji,jj) + 1.0 - ssmask(ji, jj) ) |
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| 301 | DO jk = 1, jpkm1 |
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| 302 | tsa(ji,jj,jk,jp_tem) = tsa(ji,jj,jk,jp_tem) & |
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| 303 | & + tsn(ji,jj,jk,jp_tem) * zdep * ( e3t_0(ji,jj,jk) / fse3t_n(ji,jj,jk) ) |
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| 304 | tsa(ji,jj,jk,jp_sal) = tsa(ji,jj,jk,jp_sal) & |
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| 305 | & + tsn(ji,jj,jk,jp_sal) * zdep * ( e3t_0(ji,jj,jk) / fse3t_n(ji,jj,jk) ) |
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| 306 | END DO |
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| 307 | END DO |
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| 308 | END DO |
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| 309 | ENDIF |
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| 310 | #endif |
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| 311 | |
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| [4990] | 312 | IF( l_trdtra ) THEN ! send trends for further diagnostics |
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| [2528] | 313 | ztrdt(:,:,:) = tsa(:,:,:,jp_tem) - ztrdt(:,:,:) |
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| 314 | ztrds(:,:,:) = tsa(:,:,:,jp_sal) - ztrds(:,:,:) |
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| [4990] | 315 | CALL trd_tra( kt, 'TRA', jp_tem, jptra_nsr, ztrdt ) |
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| 316 | CALL trd_tra( kt, 'TRA', jp_sal, jptra_nsr, ztrds ) |
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| [3294] | 317 | CALL wrk_dealloc( jpi, jpj, jpk, ztrdt, ztrds ) |
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| [216] | 318 | ENDIF |
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| [503] | 319 | ! |
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| [2528] | 320 | IF(ln_ctl) CALL prt_ctl( tab3d_1=tsa(:,:,:,jp_tem), clinfo1=' sbc - Ta: ', mask1=tmask, & |
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| 321 | & tab3d_2=tsa(:,:,:,jp_sal), clinfo2= ' Sa: ', mask2=tmask, clinfo3='tra' ) |
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| [503] | 322 | ! |
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| [3294] | 323 | IF( nn_timing == 1 ) CALL timing_stop('tra_sbc') |
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| 324 | ! |
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| [3] | 325 | END SUBROUTINE tra_sbc |
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| 326 | |
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| 327 | !!====================================================================== |
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| 328 | END MODULE trasbc |
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