[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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[6140] | 15 | !! tra_sbc : update the tracer trend at ocean surface |
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[3] | 16 | !!---------------------------------------------------------------------- |
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[6140] | 17 | USE oce ! ocean dynamics and active tracers |
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| 18 | USE sbc_oce ! surface boundary condition: ocean |
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| 19 | USE dom_oce ! ocean space domain variables |
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| 20 | USE phycst ! physical constant |
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| 21 | USE eosbn2 ! Equation Of State |
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| 22 | USE sbcmod ! ln_rnf |
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| 23 | USE sbcrnf ! River runoff |
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| 24 | USE sbcisf ! Ice shelf |
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| 25 | USE iscplini ! Ice sheet coupling |
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| 26 | USE traqsr ! solar radiation penetration |
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| 27 | USE trd_oce ! trends: ocean variables |
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| 28 | USE trdtra ! trends manager: tracers |
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[4990] | 29 | ! |
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[6140] | 30 | USE in_out_manager ! I/O manager |
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| 31 | USE prtctl ! Print control |
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| 32 | USE iom ! xIOS server |
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| 33 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| 34 | USE wrk_nemo ! Memory Allocation |
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| 35 | USE timing ! Timing |
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[8630] | 36 | USE iom_def, ONLY : lwxios |
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[3] | 37 | |
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| 38 | IMPLICIT NONE |
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| 39 | PRIVATE |
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| 40 | |
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[6140] | 41 | PUBLIC tra_sbc ! routine called by step.F90 |
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[3] | 42 | |
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| 43 | !! * Substitutions |
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| 44 | # include "vectopt_loop_substitute.h90" |
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| 45 | !!---------------------------------------------------------------------- |
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[4990] | 46 | !! NEMO/OPA 3.7 , NEMO Consortium (2014) |
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[888] | 47 | !! $Id$ |
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[2715] | 48 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[3] | 49 | !!---------------------------------------------------------------------- |
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| 50 | CONTAINS |
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| 51 | |
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| 52 | SUBROUTINE tra_sbc ( kt ) |
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| 53 | !!---------------------------------------------------------------------- |
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| 54 | !! *** ROUTINE tra_sbc *** |
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| 55 | !! |
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| 56 | !! ** Purpose : Compute the tracer surface boundary condition trend of |
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| 57 | !! (flux through the interface, concentration/dilution effect) |
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| 58 | !! and add it to the general trend of tracer equations. |
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| 59 | !! |
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[6140] | 60 | !! ** Method : The (air+ice)-sea flux has two components: |
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| 61 | !! (1) Fext, external forcing (i.e. flux through the (air+ice)-sea interface); |
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| 62 | !! (2) Fwe , tracer carried with the water that is exchanged with air+ice. |
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| 63 | !! The input forcing fields (emp, rnf, sfx, isf) contain Fext+Fwe, |
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| 64 | !! they are simply added to the tracer trend (tsa). |
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| 65 | !! In linear free surface case (ln_linssh=T), the volume of the |
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| 66 | !! ocean does not change with the water exchanges at the (air+ice)-sea |
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| 67 | !! interface. Therefore another term has to be added, to mimic the |
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| 68 | !! concentration/dilution effect associated with water exchanges. |
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[664] | 69 | !! |
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[6140] | 70 | !! ** Action : - Update tsa with the surface boundary condition trend |
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| 71 | !! - send trends to trdtra module for further diagnostics(l_trdtra=T) |
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[503] | 72 | !!---------------------------------------------------------------------- |
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[2528] | 73 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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[6140] | 74 | ! |
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| 75 | INTEGER :: ji, jj, jk, jn ! dummy loop indices |
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| 76 | INTEGER :: ikt, ikb ! local integers |
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| 77 | REAL(wp) :: zfact, z1_e3t, zdep ! local scalar |
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[3294] | 78 | REAL(wp), POINTER, DIMENSION(:,:,:) :: ztrdt, ztrds |
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[3] | 79 | !!---------------------------------------------------------------------- |
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[3294] | 80 | ! |
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| 81 | IF( nn_timing == 1 ) CALL timing_start('tra_sbc') |
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| 82 | ! |
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[3] | 83 | IF( kt == nit000 ) THEN |
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| 84 | IF(lwp) WRITE(numout,*) |
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| 85 | IF(lwp) WRITE(numout,*) 'tra_sbc : TRAcer Surface Boundary Condition' |
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| 86 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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| 87 | ENDIF |
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[6140] | 88 | ! |
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[4990] | 89 | IF( l_trdtra ) THEN !* Save ta and sa trends |
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[3294] | 90 | CALL wrk_alloc( jpi, jpj, jpk, ztrdt, ztrds ) |
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[7753] | 91 | ztrdt(:,:,:) = tsa(:,:,:,jp_tem) |
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| 92 | ztrds(:,:,:) = tsa(:,:,:,jp_sal) |
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[216] | 93 | ENDIF |
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[6140] | 94 | ! |
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| 95 | !!gm This should be moved into sbcmod.F90 module ? (especially now that ln_traqsr is read in namsbc namelist) |
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[2528] | 96 | IF( .NOT.ln_traqsr ) THEN ! no solar radiation penetration |
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[7753] | 97 | qns(:,:) = qns(:,:) + qsr(:,:) ! total heat flux in qns |
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| 98 | qsr(:,:) = 0._wp ! qsr set to zero |
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[2528] | 99 | ENDIF |
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[3] | 100 | |
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[2528] | 101 | !---------------------------------------- |
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[4990] | 102 | ! EMP, SFX and QNS effects |
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[2528] | 103 | !---------------------------------------- |
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[6140] | 104 | ! !== Set before sbc tracer content fields ==! |
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| 105 | IF( kt == nit000 ) THEN !* 1st time-step |
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| 106 | IF( ln_rstart .AND. & ! Restart: read in restart file |
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[2528] | 107 | & iom_varid( numror, 'sbc_hc_b', ldstop = .FALSE. ) > 0 ) THEN |
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[6140] | 108 | IF(lwp) WRITE(numout,*) ' nit000-1 sbc tracer content field read in the restart file' |
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[4990] | 109 | zfact = 0.5_wp |
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[7753] | 110 | sbc_tsc(:,:,:) = 0._wp |
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[2528] | 111 | CALL iom_get( numror, jpdom_autoglo, 'sbc_hc_b', sbc_tsc_b(:,:,jp_tem) ) ! before heat content sbc trend |
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| 112 | CALL iom_get( numror, jpdom_autoglo, 'sbc_sc_b', sbc_tsc_b(:,:,jp_sal) ) ! before salt content sbc trend |
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[6140] | 113 | ELSE ! No restart or restart not found: Euler forward time stepping |
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[4990] | 114 | zfact = 1._wp |
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[7753] | 115 | sbc_tsc(:,:,:) = 0._wp |
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| 116 | sbc_tsc_b(:,:,:) = 0._wp |
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[2528] | 117 | ENDIF |
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[6140] | 118 | ELSE !* other time-steps: swap of forcing fields |
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[4990] | 119 | zfact = 0.5_wp |
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[7753] | 120 | sbc_tsc_b(:,:,:) = sbc_tsc(:,:,:) |
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[2528] | 121 | ENDIF |
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[6140] | 122 | ! !== Now sbc tracer content fields ==! |
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| 123 | DO jj = 2, jpj |
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| 124 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 125 | sbc_tsc(ji,jj,jp_tem) = r1_rau0_rcp * qns(ji,jj) ! non solar heat flux |
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| 126 | sbc_tsc(ji,jj,jp_sal) = r1_rau0 * sfx(ji,jj) ! salt flux due to freezing/melting |
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[3] | 127 | END DO |
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[6140] | 128 | END DO |
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| 129 | IF( ln_linssh ) THEN !* linear free surface |
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| 130 | DO jj = 2, jpj !==>> add concentration/dilution effect due to constant volume cell |
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[2528] | 131 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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[6140] | 132 | sbc_tsc(ji,jj,jp_tem) = sbc_tsc(ji,jj,jp_tem) + r1_rau0 * emp(ji,jj) * tsn(ji,jj,1,jp_tem) |
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| 133 | sbc_tsc(ji,jj,jp_sal) = sbc_tsc(ji,jj,jp_sal) + r1_rau0 * emp(ji,jj) * tsn(ji,jj,1,jp_sal) |
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[2528] | 134 | END DO |
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[6140] | 135 | END DO !==>> output c./d. term |
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| 136 | IF( iom_use('emp_x_sst') ) CALL iom_put( "emp_x_sst", emp (:,:) * tsn(:,:,1,jp_tem) ) |
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| 137 | IF( iom_use('emp_x_sss') ) CALL iom_put( "emp_x_sss", emp (:,:) * tsn(:,:,1,jp_sal) ) |
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[2528] | 138 | ENDIF |
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[6140] | 139 | ! |
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| 140 | DO jn = 1, jpts !== update tracer trend ==! |
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[2528] | 141 | DO jj = 2, jpj |
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[6140] | 142 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 143 | tsa(ji,jj,1,jn) = tsa(ji,jj,1,jn) + zfact * ( sbc_tsc_b(ji,jj,jn) + sbc_tsc(ji,jj,jn) ) / e3t_n(ji,jj,1) |
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[2528] | 144 | END DO |
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| 145 | END DO |
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[3] | 146 | END DO |
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[6140] | 147 | ! |
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| 148 | IF( lrst_oce ) THEN !== write sbc_tsc in the ocean restart file ==! |
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[8630] | 149 | IF( lwxios ) CALL iom_swap( wxios_context ) |
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[8662] | 150 | CALL iom_rstput( kt, nitrst, numrow, 'sbc_hc_b', sbc_tsc(:,:,jp_tem), ldxios = lwxios ) |
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| 151 | CALL iom_rstput( kt, nitrst, numrow, 'sbc_sc_b', sbc_tsc(:,:,jp_sal), ldxios = lwxios ) |
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[8630] | 152 | IF( lwxios ) CALL iom_swap( cxios_context ) |
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[2528] | 153 | ENDIF |
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| 154 | ! |
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| 155 | !---------------------------------------- |
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[4990] | 156 | ! Ice Shelf effects (ISF) |
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| 157 | ! tbl treated as in Losh (2008) JGR |
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| 158 | !---------------------------------------- |
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| 159 | ! |
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[6140] | 160 | !!gm BUG ? Why no differences between non-linear and linear free surface ? |
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| 161 | !!gm probably taken into account in r1_hisf_tbl : to be verified |
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| 162 | IF( ln_isf ) THEN |
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| 163 | zfact = 0.5_wp |
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[4990] | 164 | DO jj = 2, jpj |
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| 165 | DO ji = fs_2, fs_jpim1 |
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[6140] | 166 | ! |
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[4990] | 167 | ikt = misfkt(ji,jj) |
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| 168 | ikb = misfkb(ji,jj) |
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[6140] | 169 | ! |
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[4990] | 170 | ! level fully include in the ice shelf boundary layer |
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| 171 | ! sign - because fwf sign of evapo (rnf sign of precip) |
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| 172 | DO jk = ikt, ikb - 1 |
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| 173 | ! compute trend |
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[6140] | 174 | tsa(ji,jj,jk,jp_tem) = tsa(ji,jj,jk,jp_tem) & |
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| 175 | & + zfact * ( risf_tsc_b(ji,jj,jp_tem) + risf_tsc(ji,jj,jp_tem) ) & |
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| 176 | & * r1_hisf_tbl(ji,jj) |
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[4990] | 177 | END DO |
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| 178 | |
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| 179 | ! level partially include in ice shelf boundary layer |
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| 180 | ! compute trend |
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[6140] | 181 | tsa(ji,jj,ikb,jp_tem) = tsa(ji,jj,ikb,jp_tem) & |
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| 182 | & + zfact * ( risf_tsc_b(ji,jj,jp_tem) + risf_tsc(ji,jj,jp_tem) ) & |
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| 183 | & * r1_hisf_tbl(ji,jj) * ralpha(ji,jj) |
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| 184 | |
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[4990] | 185 | END DO |
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| 186 | END DO |
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| 187 | END IF |
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| 188 | ! |
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| 189 | !---------------------------------------- |
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[2528] | 190 | ! River Runoff effects |
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| 191 | !---------------------------------------- |
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| 192 | ! |
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[3764] | 193 | IF( ln_rnf ) THEN ! input of heat and salt due to river runoff |
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| 194 | zfact = 0.5_wp |
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[2528] | 195 | DO jj = 2, jpj |
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| 196 | DO ji = fs_2, fs_jpim1 |
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[3764] | 197 | IF( rnf(ji,jj) /= 0._wp ) THEN |
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| 198 | zdep = zfact / h_rnf(ji,jj) |
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[2528] | 199 | DO jk = 1, nk_rnf(ji,jj) |
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[6140] | 200 | tsa(ji,jj,jk,jp_tem) = tsa(ji,jj,jk,jp_tem) & |
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| 201 | & + ( rnf_tsc_b(ji,jj,jp_tem) + rnf_tsc(ji,jj,jp_tem) ) * zdep |
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| 202 | IF( ln_rnf_sal ) tsa(ji,jj,jk,jp_sal) = tsa(ji,jj,jk,jp_sal) & |
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| 203 | & + ( rnf_tsc_b(ji,jj,jp_sal) + rnf_tsc(ji,jj,jp_sal) ) * zdep |
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[2715] | 204 | END DO |
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[2528] | 205 | ENDIF |
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[2715] | 206 | END DO |
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| 207 | END DO |
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[3764] | 208 | ENDIF |
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[6472] | 209 | |
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| 210 | 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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| 211 | 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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| 212 | |
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[6140] | 213 | ! |
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| 214 | !---------------------------------------- |
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| 215 | ! Ice Sheet coupling imbalance correction to have conservation |
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| 216 | !---------------------------------------- |
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| 217 | ! |
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| 218 | IF( ln_iscpl .AND. ln_hsb) THEN ! input of heat and salt due to river runoff |
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| 219 | DO jk = 1,jpk |
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| 220 | DO jj = 2, jpj |
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| 221 | DO ji = fs_2, fs_jpim1 |
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| 222 | zdep = 1._wp / e3t_n(ji,jj,jk) |
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| 223 | tsa(ji,jj,jk,jp_tem) = tsa(ji,jj,jk,jp_tem) - htsc_iscpl(ji,jj,jk,jp_tem) & |
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| 224 | & * zdep |
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| 225 | tsa(ji,jj,jk,jp_sal) = tsa(ji,jj,jk,jp_sal) - htsc_iscpl(ji,jj,jk,jp_sal) & |
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| 226 | & * zdep |
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| 227 | END DO |
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| 228 | END DO |
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| 229 | END DO |
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| 230 | ENDIF |
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| 231 | |
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| 232 | IF( l_trdtra ) THEN ! save the horizontal diffusive trends for further diagnostics |
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[7753] | 233 | ztrdt(:,:,:) = tsa(:,:,:,jp_tem) - ztrdt(:,:,:) |
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| 234 | ztrds(:,:,:) = tsa(:,:,:,jp_sal) - ztrds(:,:,:) |
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[4990] | 235 | CALL trd_tra( kt, 'TRA', jp_tem, jptra_nsr, ztrdt ) |
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| 236 | CALL trd_tra( kt, 'TRA', jp_sal, jptra_nsr, ztrds ) |
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[3294] | 237 | CALL wrk_dealloc( jpi, jpj, jpk, ztrdt, ztrds ) |
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[216] | 238 | ENDIF |
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[503] | 239 | ! |
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[2528] | 240 | IF(ln_ctl) CALL prt_ctl( tab3d_1=tsa(:,:,:,jp_tem), clinfo1=' sbc - Ta: ', mask1=tmask, & |
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| 241 | & tab3d_2=tsa(:,:,:,jp_sal), clinfo2= ' Sa: ', mask2=tmask, clinfo3='tra' ) |
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[503] | 242 | ! |
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[3294] | 243 | IF( nn_timing == 1 ) CALL timing_stop('tra_sbc') |
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| 244 | ! |
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[3] | 245 | END SUBROUTINE tra_sbc |
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| 246 | |
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| 247 | !!====================================================================== |
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| 248 | END MODULE trasbc |
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