[3] | 1 | MODULE trabbl |
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| 2 | !!============================================================================== |
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| 3 | !! *** MODULE trabbl *** |
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| 4 | !! Ocean physics : advective and/or diffusive bottom boundary layer scheme |
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| 5 | !!============================================================================== |
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[2528] | 6 | !! History : OPA ! 1996-06 (L. Mortier) Original code |
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| 7 | !! 8.0 ! 1997-11 (G. Madec) Optimization |
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| 8 | !! NEMO 1.0 ! 2002-08 (G. Madec) free form + modules |
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| 9 | !! - ! 2004-01 (A. de Miranda, G. Madec, J.M. Molines ) add advective bbl |
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[3764] | 10 | !! 3.3 ! 2009-11 (G. Madec) merge trabbl and trabbl_adv + style + optimization |
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| 11 | !! - ! 2010-04 (G. Madec) Campin & Goosse advective bbl |
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[2528] | 12 | !! - ! 2010-06 (C. Ethe, G. Madec) merge TRA-TRC |
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| 13 | !! - ! 2010-11 (G. Madec) add mbk. arrays associated to the deepest ocean level |
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[4990] | 14 | !! - ! 2013-04 (F. Roquet, G. Madec) use of eosbn2 instead of local hard coded alpha and beta |
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[9019] | 15 | !! 4.0 ! 2017-04 (G. Madec) ln_trabbl namelist variable instead of a CPP key |
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[503] | 16 | !!---------------------------------------------------------------------- |
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[9019] | 17 | |
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[3] | 18 | !!---------------------------------------------------------------------- |
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[2715] | 19 | !! tra_bbl_alloc : allocate trabbl arrays |
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[2528] | 20 | !! tra_bbl : update the tracer trends due to the bottom boundary layer (advective and/or diffusive) |
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| 21 | !! tra_bbl_dif : generic routine to compute bbl diffusive trend |
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| 22 | !! tra_bbl_adv : generic routine to compute bbl advective trend |
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| 23 | !! bbl : computation of bbl diffu. flux coef. & transport in bottom boundary layer |
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| 24 | !! tra_bbl_init : initialization, namelist read, parameters control |
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[503] | 25 | !!---------------------------------------------------------------------- |
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[2528] | 26 | USE oce ! ocean dynamics and active tracers |
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| 27 | USE dom_oce ! ocean space and time domain |
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| 28 | USE phycst ! physical constant |
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| 29 | USE eosbn2 ! equation of state |
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[5836] | 30 | USE trd_oce ! trends: ocean variables |
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[2528] | 31 | USE trdtra ! trends: active tracers |
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[4990] | 32 | ! |
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| 33 | USE iom ! IOM library |
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[2528] | 34 | USE in_out_manager ! I/O manager |
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| 35 | USE lbclnk ! ocean lateral boundary conditions |
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| 36 | USE prtctl ! Print control |
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[3294] | 37 | USE timing ! Timing |
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[4990] | 38 | USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) |
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[3] | 39 | |
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| 40 | IMPLICIT NONE |
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| 41 | PRIVATE |
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| 42 | |
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[2528] | 43 | PUBLIC tra_bbl ! routine called by step.F90 |
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[9124] | 44 | PUBLIC tra_bbl_init ! routine called by nemogcm.F90 |
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[2528] | 45 | PUBLIC tra_bbl_dif ! routine called by trcbbl.F90 |
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[9124] | 46 | PUBLIC tra_bbl_adv ! - - - |
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[2528] | 47 | PUBLIC bbl ! routine called by trcbbl.F90 and dtadyn.F90 |
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[3] | 48 | |
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[4147] | 49 | ! !!* Namelist nambbl * |
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[9019] | 50 | LOGICAL , PUBLIC :: ln_trabbl !: bottom boundary layer flag |
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[4147] | 51 | INTEGER , PUBLIC :: nn_bbl_ldf !: =1 : diffusive bbl or not (=0) |
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| 52 | INTEGER , PUBLIC :: nn_bbl_adv !: =1/2 : advective bbl or not (=0) |
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[2528] | 53 | ! ! =1 : advective bbl using the bottom ocean velocity |
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| 54 | ! ! =2 : - - using utr_bbl proportional to grad(rho) |
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[4147] | 55 | REAL(wp), PUBLIC :: rn_ahtbbl !: along slope bbl diffusive coefficient [m2/s] |
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| 56 | REAL(wp), PUBLIC :: rn_gambbl !: lateral coeff. for bottom boundary layer scheme [s] |
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[409] | 57 | |
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[4990] | 58 | LOGICAL , PUBLIC :: l_bbl !: flag to compute bbl diffu. flux coef and transport |
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[3764] | 59 | |
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[2715] | 60 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:), PUBLIC :: utr_bbl , vtr_bbl ! u- (v-) transport in the bottom boundary layer |
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| 61 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:), PUBLIC :: ahu_bbl , ahv_bbl ! masked diffusive bbl coeff. at u & v-pts |
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[3] | 62 | |
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[3764] | 63 | INTEGER , ALLOCATABLE, SAVE, DIMENSION(:,:), PUBLIC :: mbku_d , mbkv_d ! vertical index of the "lower" bottom ocean U/V-level (PUBLIC for TAM) |
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| 64 | INTEGER , ALLOCATABLE, SAVE, DIMENSION(:,:), PUBLIC :: mgrhu , mgrhv ! = +/-1, sign of grad(H) in u-(v-)direction (PUBLIC for TAM) |
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| 65 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: ahu_bbl_0, ahv_bbl_0 ! diffusive bbl flux coefficients at u and v-points |
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| 66 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:), PUBLIC :: e3u_bbl_0, e3v_bbl_0 ! thichness of the bbl (e3) at u and v-points (PUBLIC for TAM) |
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[3] | 67 | |
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| 68 | !! * Substitutions |
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| 69 | # include "vectopt_loop_substitute.h90" |
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| 70 | !!---------------------------------------------------------------------- |
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[9598] | 71 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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[2528] | 72 | !! $Id$ |
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[10068] | 73 | !! Software governed by the CeCILL license (see ./LICENSE) |
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[3] | 74 | !!---------------------------------------------------------------------- |
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| 75 | CONTAINS |
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| 76 | |
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[2715] | 77 | INTEGER FUNCTION tra_bbl_alloc() |
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| 78 | !!---------------------------------------------------------------------- |
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| 79 | !! *** FUNCTION tra_bbl_alloc *** |
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| 80 | !!---------------------------------------------------------------------- |
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[9019] | 81 | ALLOCATE( utr_bbl (jpi,jpj) , ahu_bbl (jpi,jpj) , mbku_d(jpi,jpj) , mgrhu(jpi,jpj) , & |
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| 82 | & vtr_bbl (jpi,jpj) , ahv_bbl (jpi,jpj) , mbkv_d(jpi,jpj) , mgrhv(jpi,jpj) , & |
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| 83 | & ahu_bbl_0(jpi,jpj) , ahv_bbl_0(jpi,jpj) , & |
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| 84 | & e3u_bbl_0(jpi,jpj) , e3v_bbl_0(jpi,jpj) , STAT=tra_bbl_alloc ) |
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[2715] | 85 | ! |
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[10425] | 86 | CALL mpp_sum ( 'trabbl', tra_bbl_alloc ) |
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[2715] | 87 | IF( tra_bbl_alloc > 0 ) CALL ctl_warn('tra_bbl_alloc: allocation of arrays failed.') |
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| 88 | END FUNCTION tra_bbl_alloc |
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| 89 | |
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| 90 | |
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[2528] | 91 | SUBROUTINE tra_bbl( kt ) |
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[3] | 92 | !!---------------------------------------------------------------------- |
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[2528] | 93 | !! *** ROUTINE bbl *** |
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[3764] | 94 | !! |
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| 95 | !! ** Purpose : Compute the before tracer (t & s) trend associated |
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[2528] | 96 | !! with the bottom boundary layer and add it to the general |
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| 97 | !! trend of tracer equations. |
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[3] | 98 | !! |
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[2528] | 99 | !! ** Method : Depending on namtra_bbl namelist parameters the bbl |
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| 100 | !! diffusive and/or advective contribution to the tracer trend |
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| 101 | !! is added to the general tracer trend |
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[3764] | 102 | !!---------------------------------------------------------------------- |
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| 103 | INTEGER, INTENT( in ) :: kt ! ocean time-step |
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[4990] | 104 | ! |
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[9019] | 105 | REAL(wp), ALLOCATABLE, DIMENSION(:,:,:) :: ztrdt, ztrds |
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[2528] | 106 | !!---------------------------------------------------------------------- |
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[3294] | 107 | ! |
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[9019] | 108 | IF( ln_timing ) CALL timing_start( 'tra_bbl') |
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[3294] | 109 | ! |
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[9019] | 110 | IF( l_trdtra ) THEN !* Save the T-S input trends |
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| 111 | ALLOCATE( ztrdt(jpi,jpj,jpk) , ztrds(jpi,jpj,jpk) ) |
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[7753] | 112 | ztrdt(:,:,:) = tsa(:,:,:,jp_tem) |
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| 113 | ztrds(:,:,:) = tsa(:,:,:,jp_sal) |
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[2528] | 114 | ENDIF |
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| 115 | |
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[4990] | 116 | IF( l_bbl ) CALL bbl( kt, nit000, 'TRA' ) !* bbl coef. and transport (only if not already done in trcbbl) |
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[3764] | 117 | |
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[4990] | 118 | IF( nn_bbl_ldf == 1 ) THEN !* Diffusive bbl |
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[3294] | 119 | ! |
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[2528] | 120 | CALL tra_bbl_dif( tsb, tsa, jpts ) |
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| 121 | IF( ln_ctl ) & |
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| 122 | CALL prt_ctl( tab3d_1=tsa(:,:,:,jp_tem), clinfo1=' bbl_ldf - Ta: ', mask1=tmask, & |
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[4990] | 123 | & tab3d_2=tsa(:,:,:,jp_sal), clinfo2= ' Sa: ', mask2=tmask, clinfo3='tra' ) |
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[3764] | 124 | ! lateral boundary conditions ; just need for outputs |
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[10425] | 125 | CALL lbc_lnk_multi( 'trabbl', ahu_bbl, 'U', 1. , ahv_bbl, 'V', 1. ) |
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[3764] | 126 | CALL iom_put( "ahu_bbl", ahu_bbl ) ! bbl diffusive flux i-coef |
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[2528] | 127 | CALL iom_put( "ahv_bbl", ahv_bbl ) ! bbl diffusive flux j-coef |
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[3294] | 128 | ! |
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[9168] | 129 | ENDIF |
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[6140] | 130 | ! |
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[4990] | 131 | IF( nn_bbl_adv /= 0 ) THEN !* Advective bbl |
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[3294] | 132 | ! |
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[2528] | 133 | CALL tra_bbl_adv( tsb, tsa, jpts ) |
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| 134 | IF(ln_ctl) & |
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| 135 | CALL prt_ctl( tab3d_1=tsa(:,:,:,jp_tem), clinfo1=' bbl_adv - Ta: ', mask1=tmask, & |
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[4990] | 136 | & tab3d_2=tsa(:,:,:,jp_sal), clinfo2= ' Sa: ', mask2=tmask, clinfo3='tra' ) |
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[3764] | 137 | ! lateral boundary conditions ; just need for outputs |
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[10425] | 138 | CALL lbc_lnk_multi( 'trabbl', utr_bbl, 'U', 1. , vtr_bbl, 'V', 1. ) |
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[3764] | 139 | CALL iom_put( "uoce_bbl", utr_bbl ) ! bbl i-transport |
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[2528] | 140 | CALL iom_put( "voce_bbl", vtr_bbl ) ! bbl j-transport |
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[3294] | 141 | ! |
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[9168] | 142 | ENDIF |
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[2528] | 143 | |
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[6140] | 144 | IF( l_trdtra ) THEN ! send the trends for further diagnostics |
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[7753] | 145 | ztrdt(:,:,:) = tsa(:,:,:,jp_tem) - ztrdt(:,:,:) |
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| 146 | ztrds(:,:,:) = tsa(:,:,:,jp_sal) - ztrds(:,:,:) |
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[4990] | 147 | CALL trd_tra( kt, 'TRA', jp_tem, jptra_bbl, ztrdt ) |
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| 148 | CALL trd_tra( kt, 'TRA', jp_sal, jptra_bbl, ztrds ) |
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[9019] | 149 | DEALLOCATE( ztrdt, ztrds ) |
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[2528] | 150 | ENDIF |
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| 151 | ! |
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[9019] | 152 | IF( ln_timing ) CALL timing_stop( 'tra_bbl') |
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[3294] | 153 | ! |
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[2528] | 154 | END SUBROUTINE tra_bbl |
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| 155 | |
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| 156 | |
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| 157 | SUBROUTINE tra_bbl_dif( ptb, pta, kjpt ) |
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| 158 | !!---------------------------------------------------------------------- |
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| 159 | !! *** ROUTINE tra_bbl_dif *** |
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[3764] | 160 | !! |
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[2528] | 161 | !! ** Purpose : Computes the bottom boundary horizontal and vertical |
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[3764] | 162 | !! advection terms. |
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[2528] | 163 | !! |
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[4990] | 164 | !! ** Method : * diffusive bbl only (nn_bbl_ldf=1) : |
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[2528] | 165 | !! When the product grad( rho) * grad(h) < 0 (where grad is an |
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| 166 | !! along bottom slope gradient) an additional lateral 2nd order |
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| 167 | !! diffusion along the bottom slope is added to the general |
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| 168 | !! tracer trend, otherwise the additional trend is set to 0. |
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| 169 | !! A typical value of ahbt is 2000 m2/s (equivalent to |
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[3] | 170 | !! a downslope velocity of 20 cm/s if the condition for slope |
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| 171 | !! convection is satified) |
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| 172 | !! |
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[2528] | 173 | !! ** Action : pta increased by the bbl diffusive trend |
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[3] | 174 | !! |
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[503] | 175 | !! References : Beckmann, A., and R. Doscher, 1997, J. Phys.Oceanogr., 581-591. |
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[2528] | 176 | !! Campin, J.-M., and H. Goosse, 1999, Tellus, 412-430. |
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[3764] | 177 | !!---------------------------------------------------------------------- |
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[2715] | 178 | INTEGER , INTENT(in ) :: kjpt ! number of tracers |
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| 179 | REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT(in ) :: ptb ! before and now tracer fields |
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[3764] | 180 | REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT(inout) :: pta ! tracer trend |
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[2715] | 181 | ! |
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[2528] | 182 | INTEGER :: ji, jj, jn ! dummy loop indices |
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| 183 | INTEGER :: ik ! local integers |
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| 184 | REAL(wp) :: zbtr ! local scalars |
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[9019] | 185 | REAL(wp), DIMENSION(jpi,jpj) :: zptb ! workspace |
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[3] | 186 | !!---------------------------------------------------------------------- |
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[2528] | 187 | ! |
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| 188 | DO jn = 1, kjpt ! tracer loop |
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| 189 | ! ! =========== |
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| 190 | DO jj = 1, jpj |
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[3764] | 191 | DO ji = 1, jpi |
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[5836] | 192 | ik = mbkt(ji,jj) ! bottom T-level index |
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| 193 | zptb(ji,jj) = ptb(ji,jj,ik,jn) ! bottom before T and S |
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[2528] | 194 | END DO |
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| 195 | END DO |
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[4990] | 196 | ! |
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| 197 | DO jj = 2, jpjm1 ! Compute the trend |
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[2528] | 198 | DO ji = 2, jpim1 |
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[5836] | 199 | ik = mbkt(ji,jj) ! bottom T-level index |
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| 200 | pta(ji,jj,ik,jn) = pta(ji,jj,ik,jn) & |
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| 201 | & + ( ahu_bbl(ji ,jj ) * ( zptb(ji+1,jj ) - zptb(ji ,jj ) ) & |
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| 202 | & - ahu_bbl(ji-1,jj ) * ( zptb(ji ,jj ) - zptb(ji-1,jj ) ) & |
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| 203 | & + ahv_bbl(ji ,jj ) * ( zptb(ji ,jj+1) - zptb(ji ,jj ) ) & |
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| 204 | & - ahv_bbl(ji ,jj-1) * ( zptb(ji ,jj ) - zptb(ji ,jj-1) ) ) & |
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[6140] | 205 | & * r1_e1e2t(ji,jj) / e3t_n(ji,jj,ik) |
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[2528] | 206 | END DO |
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[3] | 207 | END DO |
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[2528] | 208 | ! ! =========== |
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| 209 | END DO ! end tracer |
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| 210 | ! ! =========== |
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| 211 | END SUBROUTINE tra_bbl_dif |
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[3] | 212 | |
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[3764] | 213 | |
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[2528] | 214 | SUBROUTINE tra_bbl_adv( ptb, pta, kjpt ) |
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| 215 | !!---------------------------------------------------------------------- |
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| 216 | !! *** ROUTINE trc_bbl *** |
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| 217 | !! |
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[3764] | 218 | !! ** Purpose : Compute the before passive tracer trend associated |
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[2528] | 219 | !! with the bottom boundary layer and add it to the general trend |
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| 220 | !! of tracer equations. |
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| 221 | !! ** Method : advective bbl (nn_bbl_adv = 1 or 2) : |
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| 222 | !! nn_bbl_adv = 1 use of the ocean near bottom velocity as bbl velocity |
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[3764] | 223 | !! nn_bbl_adv = 2 follow Campin and Goosse (1999) implentation i.e. |
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| 224 | !! transport proportional to the along-slope density gradient |
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[2528] | 225 | !! |
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| 226 | !! References : Beckmann, A., and R. Doscher, 1997, J. Phys.Oceanogr., 581-591. |
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| 227 | !! Campin, J.-M., and H. Goosse, 1999, Tellus, 412-430. |
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[3764] | 228 | !!---------------------------------------------------------------------- |
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[2715] | 229 | INTEGER , INTENT(in ) :: kjpt ! number of tracers |
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| 230 | REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT(in ) :: ptb ! before and now tracer fields |
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[3764] | 231 | REAL(wp), DIMENSION(jpi,jpj,jpk,kjpt), INTENT(inout) :: pta ! tracer trend |
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[2715] | 232 | ! |
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[2528] | 233 | INTEGER :: ji, jj, jk, jn ! dummy loop indices |
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| 234 | INTEGER :: iis , iid , ijs , ijd ! local integers |
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| 235 | INTEGER :: ikus, ikud, ikvs, ikvd ! - - |
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| 236 | REAL(wp) :: zbtr, ztra ! local scalars |
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| 237 | REAL(wp) :: zu_bbl, zv_bbl ! - - |
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| 238 | !!---------------------------------------------------------------------- |
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| 239 | ! |
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| 240 | ! ! =========== |
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| 241 | DO jn = 1, kjpt ! tracer loop |
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[3764] | 242 | ! ! =========== |
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[457] | 243 | DO jj = 1, jpjm1 |
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[2528] | 244 | DO ji = 1, jpim1 ! CAUTION start from i=1 to update i=2 when cyclic east-west |
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| 245 | IF( utr_bbl(ji,jj) /= 0.e0 ) THEN ! non-zero i-direction bbl advection |
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| 246 | ! down-slope i/k-indices (deep) & up-slope i/k indices (shelf) |
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| 247 | iid = ji + MAX( 0, mgrhu(ji,jj) ) ; iis = ji + 1 - MAX( 0, mgrhu(ji,jj) ) |
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| 248 | ikud = mbku_d(ji,jj) ; ikus = mbku(ji,jj) |
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| 249 | zu_bbl = ABS( utr_bbl(ji,jj) ) |
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| 250 | ! |
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| 251 | ! ! up -slope T-point (shelf bottom point) |
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[6140] | 252 | zbtr = r1_e1e2t(iis,jj) / e3t_n(iis,jj,ikus) |
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[2528] | 253 | ztra = zu_bbl * ( ptb(iid,jj,ikus,jn) - ptb(iis,jj,ikus,jn) ) * zbtr |
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| 254 | pta(iis,jj,ikus,jn) = pta(iis,jj,ikus,jn) + ztra |
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[3764] | 255 | ! |
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[2528] | 256 | DO jk = ikus, ikud-1 ! down-slope upper to down T-point (deep column) |
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[6140] | 257 | zbtr = r1_e1e2t(iid,jj) / e3t_n(iid,jj,jk) |
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[2528] | 258 | ztra = zu_bbl * ( ptb(iid,jj,jk+1,jn) - ptb(iid,jj,jk,jn) ) * zbtr |
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| 259 | pta(iid,jj,jk,jn) = pta(iid,jj,jk,jn) + ztra |
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| 260 | END DO |
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[3764] | 261 | ! |
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[6140] | 262 | zbtr = r1_e1e2t(iid,jj) / e3t_n(iid,jj,ikud) |
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[2528] | 263 | ztra = zu_bbl * ( ptb(iis,jj,ikus,jn) - ptb(iid,jj,ikud,jn) ) * zbtr |
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| 264 | pta(iid,jj,ikud,jn) = pta(iid,jj,ikud,jn) + ztra |
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| 265 | ENDIF |
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| 266 | ! |
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| 267 | IF( vtr_bbl(ji,jj) /= 0.e0 ) THEN ! non-zero j-direction bbl advection |
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| 268 | ! down-slope j/k-indices (deep) & up-slope j/k indices (shelf) |
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| 269 | ijd = jj + MAX( 0, mgrhv(ji,jj) ) ; ijs = jj + 1 - MAX( 0, mgrhv(ji,jj) ) |
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| 270 | ikvd = mbkv_d(ji,jj) ; ikvs = mbkv(ji,jj) |
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| 271 | zv_bbl = ABS( vtr_bbl(ji,jj) ) |
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[3764] | 272 | ! |
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[2528] | 273 | ! up -slope T-point (shelf bottom point) |
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[6140] | 274 | zbtr = r1_e1e2t(ji,ijs) / e3t_n(ji,ijs,ikvs) |
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[2528] | 275 | ztra = zv_bbl * ( ptb(ji,ijd,ikvs,jn) - ptb(ji,ijs,ikvs,jn) ) * zbtr |
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| 276 | pta(ji,ijs,ikvs,jn) = pta(ji,ijs,ikvs,jn) + ztra |
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[3764] | 277 | ! |
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[2528] | 278 | DO jk = ikvs, ikvd-1 ! down-slope upper to down T-point (deep column) |
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[6140] | 279 | zbtr = r1_e1e2t(ji,ijd) / e3t_n(ji,ijd,jk) |
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[2528] | 280 | ztra = zv_bbl * ( ptb(ji,ijd,jk+1,jn) - ptb(ji,ijd,jk,jn) ) * zbtr |
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| 281 | pta(ji,ijd,jk,jn) = pta(ji,ijd,jk,jn) + ztra |
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| 282 | END DO |
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| 283 | ! ! down-slope T-point (deep bottom point) |
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[6140] | 284 | zbtr = r1_e1e2t(ji,ijd) / e3t_n(ji,ijd,ikvd) |
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[2528] | 285 | ztra = zv_bbl * ( ptb(ji,ijs,ikvs,jn) - ptb(ji,ijd,ikvd,jn) ) * zbtr |
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| 286 | pta(ji,ijd,ikvd,jn) = pta(ji,ijd,ikvd,jn) + ztra |
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| 287 | ENDIF |
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[457] | 288 | END DO |
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[2528] | 289 | ! |
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[457] | 290 | END DO |
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[9019] | 291 | ! ! =========== |
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| 292 | END DO ! end tracer |
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| 293 | ! ! =========== |
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[2528] | 294 | END SUBROUTINE tra_bbl_adv |
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[3] | 295 | |
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| 296 | |
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[3294] | 297 | SUBROUTINE bbl( kt, kit000, cdtype ) |
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[2528] | 298 | !!---------------------------------------------------------------------- |
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| 299 | !! *** ROUTINE bbl *** |
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[3764] | 300 | !! |
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[2528] | 301 | !! ** Purpose : Computes the bottom boundary horizontal and vertical |
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[3764] | 302 | !! advection terms. |
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[2528] | 303 | !! |
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[4990] | 304 | !! ** Method : * diffusive bbl (nn_bbl_ldf=1) : |
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[2528] | 305 | !! When the product grad( rho) * grad(h) < 0 (where grad is an |
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| 306 | !! along bottom slope gradient) an additional lateral 2nd order |
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| 307 | !! diffusion along the bottom slope is added to the general |
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| 308 | !! tracer trend, otherwise the additional trend is set to 0. |
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| 309 | !! A typical value of ahbt is 2000 m2/s (equivalent to |
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| 310 | !! a downslope velocity of 20 cm/s if the condition for slope |
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| 311 | !! convection is satified) |
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[4990] | 312 | !! * advective bbl (nn_bbl_adv=1 or 2) : |
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[2528] | 313 | !! nn_bbl_adv = 1 use of the ocean velocity as bbl velocity |
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| 314 | !! nn_bbl_adv = 2 follow Campin and Goosse (1999) implentation |
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| 315 | !! i.e. transport proportional to the along-slope density gradient |
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| 316 | !! |
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| 317 | !! NB: the along slope density gradient is evaluated using the |
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| 318 | !! local density (i.e. referenced at a common local depth). |
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| 319 | !! |
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| 320 | !! References : Beckmann, A., and R. Doscher, 1997, J. Phys.Oceanogr., 581-591. |
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| 321 | !! Campin, J.-M., and H. Goosse, 1999, Tellus, 412-430. |
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[3764] | 322 | !!---------------------------------------------------------------------- |
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[2528] | 323 | INTEGER , INTENT(in ) :: kt ! ocean time-step index |
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[4990] | 324 | INTEGER , INTENT(in ) :: kit000 ! first time step index |
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[2528] | 325 | CHARACTER(len=3), INTENT(in ) :: cdtype ! =TRA or TRC (tracer indicator) |
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[6140] | 326 | ! |
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[2528] | 327 | INTEGER :: ji, jj ! dummy loop indices |
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| 328 | INTEGER :: ik ! local integers |
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[4990] | 329 | INTEGER :: iis, iid, ikus, ikud ! - - |
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| 330 | INTEGER :: ijs, ijd, ikvs, ikvd ! - - |
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| 331 | REAL(wp) :: za, zb, zgdrho ! local scalars |
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| 332 | REAL(wp) :: zsign, zsigna, zgbbl ! - - |
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| 333 | REAL(wp), DIMENSION(jpi,jpj,jpts) :: zts, zab ! 3D workspace |
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| 334 | REAL(wp), DIMENSION(jpi,jpj) :: zub, zvb, zdep ! 2D workspace |
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[2528] | 335 | !!---------------------------------------------------------------------- |
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[3294] | 336 | ! |
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| 337 | IF( kt == kit000 ) THEN |
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[2528] | 338 | IF(lwp) WRITE(numout,*) |
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| 339 | IF(lwp) WRITE(numout,*) 'trabbl:bbl : Compute bbl velocities and diffusive coefficients in ', cdtype |
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| 340 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~' |
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| 341 | ENDIF |
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[4990] | 342 | ! !* bottom variables (T, S, alpha, beta, depth, velocity) |
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[2528] | 343 | DO jj = 1, jpj |
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| 344 | DO ji = 1, jpi |
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[4990] | 345 | ik = mbkt(ji,jj) ! bottom T-level index |
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| 346 | zts (ji,jj,jp_tem) = tsb(ji,jj,ik,jp_tem) ! bottom before T and S |
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| 347 | zts (ji,jj,jp_sal) = tsb(ji,jj,ik,jp_sal) |
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[2528] | 348 | ! |
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[6140] | 349 | zdep(ji,jj) = gdept_n(ji,jj,ik) ! bottom T-level reference depth |
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[4990] | 350 | zub (ji,jj) = un(ji,jj,mbku(ji,jj)) ! bottom velocity |
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| 351 | zvb (ji,jj) = vn(ji,jj,mbkv(ji,jj)) |
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[2528] | 352 | END DO |
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| 353 | END DO |
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[4990] | 354 | ! |
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| 355 | CALL eos_rab( zts, zdep, zab ) |
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| 356 | ! |
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[2528] | 357 | ! !-------------------! |
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| 358 | IF( nn_bbl_ldf == 1 ) THEN ! diffusive bbl ! |
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| 359 | ! !-------------------! |
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| 360 | DO jj = 1, jpjm1 ! (criteria for non zero flux: grad(rho).grad(h) < 0 ) |
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[4990] | 361 | DO ji = 1, fs_jpim1 ! vector opt. |
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| 362 | ! ! i-direction |
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| 363 | za = zab(ji+1,jj,jp_tem) + zab(ji,jj,jp_tem) ! 2*(alpha,beta) at u-point |
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| 364 | zb = zab(ji+1,jj,jp_sal) + zab(ji,jj,jp_sal) |
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| 365 | ! ! 2*masked bottom density gradient |
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| 366 | zgdrho = ( za * ( zts(ji+1,jj,jp_tem) - zts(ji,jj,jp_tem) ) & |
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| 367 | & - zb * ( zts(ji+1,jj,jp_sal) - zts(ji,jj,jp_sal) ) ) * umask(ji,jj,1) |
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[3764] | 368 | ! |
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[4990] | 369 | zsign = SIGN( 0.5, -zgdrho * REAL( mgrhu(ji,jj) ) ) ! sign of ( i-gradient * i-slope ) |
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| 370 | ahu_bbl(ji,jj) = ( 0.5 - zsign ) * ahu_bbl_0(ji,jj) ! masked diffusive flux coeff. |
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[1601] | 371 | ! |
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[4990] | 372 | ! ! j-direction |
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| 373 | za = zab(ji,jj+1,jp_tem) + zab(ji,jj,jp_tem) ! 2*(alpha,beta) at v-point |
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| 374 | zb = zab(ji,jj+1,jp_sal) + zab(ji,jj,jp_sal) |
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| 375 | ! ! 2*masked bottom density gradient |
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| 376 | zgdrho = ( za * ( zts(ji,jj+1,jp_tem) - zts(ji,jj,jp_tem) ) & |
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| 377 | & - zb * ( zts(ji,jj+1,jp_sal) - zts(ji,jj,jp_sal) ) ) * vmask(ji,jj,1) |
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[3764] | 378 | ! |
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[4990] | 379 | zsign = SIGN( 0.5, -zgdrho * REAL( mgrhv(ji,jj) ) ) ! sign of ( j-gradient * j-slope ) |
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[2528] | 380 | ahv_bbl(ji,jj) = ( 0.5 - zsign ) * ahv_bbl_0(ji,jj) |
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[1601] | 381 | END DO |
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[3] | 382 | END DO |
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[1601] | 383 | ! |
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[2528] | 384 | ENDIF |
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[6140] | 385 | ! |
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[2528] | 386 | ! !-------------------! |
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| 387 | IF( nn_bbl_adv /= 0 ) THEN ! advective bbl ! |
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| 388 | ! !-------------------! |
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| 389 | SELECT CASE ( nn_bbl_adv ) !* bbl transport type |
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[503] | 390 | ! |
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[2528] | 391 | CASE( 1 ) != use of upper velocity |
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| 392 | DO jj = 1, jpjm1 ! criteria: grad(rho).grad(h)<0 and grad(rho).grad(h)<0 |
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| 393 | DO ji = 1, fs_jpim1 ! vector opt. |
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[4990] | 394 | ! ! i-direction |
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| 395 | za = zab(ji+1,jj,jp_tem) + zab(ji,jj,jp_tem) ! 2*(alpha,beta) at u-point |
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| 396 | zb = zab(ji+1,jj,jp_sal) + zab(ji,jj,jp_sal) |
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| 397 | ! ! 2*masked bottom density gradient |
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| 398 | zgdrho = ( za * ( zts(ji+1,jj,jp_tem) - zts(ji,jj,jp_tem) ) & |
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| 399 | - zb * ( zts(ji+1,jj,jp_sal) - zts(ji,jj,jp_sal) ) ) * umask(ji,jj,1) |
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[3764] | 400 | ! |
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[4990] | 401 | zsign = SIGN( 0.5, - zgdrho * REAL( mgrhu(ji,jj) ) ) ! sign of i-gradient * i-slope |
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| 402 | zsigna= SIGN( 0.5, zub(ji,jj) * REAL( mgrhu(ji,jj) ) ) ! sign of u * i-slope |
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[2528] | 403 | ! |
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[4990] | 404 | ! ! bbl velocity |
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[2528] | 405 | utr_bbl(ji,jj) = ( 0.5 + zsigna ) * ( 0.5 - zsign ) * e2u(ji,jj) * e3u_bbl_0(ji,jj) * zub(ji,jj) |
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| 406 | ! |
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[4990] | 407 | ! ! j-direction |
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| 408 | za = zab(ji,jj+1,jp_tem) + zab(ji,jj,jp_tem) ! 2*(alpha,beta) at v-point |
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| 409 | zb = zab(ji,jj+1,jp_sal) + zab(ji,jj,jp_sal) |
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| 410 | ! ! 2*masked bottom density gradient |
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| 411 | zgdrho = ( za * ( zts(ji,jj+1,jp_tem) - zts(ji,jj,jp_tem) ) & |
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| 412 | & - zb * ( zts(ji,jj+1,jp_sal) - zts(ji,jj,jp_sal) ) ) * vmask(ji,jj,1) |
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| 413 | zsign = SIGN( 0.5, - zgdrho * REAL( mgrhv(ji,jj) ) ) ! sign of j-gradient * j-slope |
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| 414 | zsigna= SIGN( 0.5, zvb(ji,jj) * REAL( mgrhv(ji,jj) ) ) ! sign of u * i-slope |
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[2528] | 415 | ! |
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[4990] | 416 | ! ! bbl transport |
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[2528] | 417 | vtr_bbl(ji,jj) = ( 0.5 + zsigna ) * ( 0.5 - zsign ) * e1v(ji,jj) * e3v_bbl_0(ji,jj) * zvb(ji,jj) |
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| 418 | END DO |
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| 419 | END DO |
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[503] | 420 | ! |
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[2528] | 421 | CASE( 2 ) != bbl velocity = F( delta rho ) |
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| 422 | zgbbl = grav * rn_gambbl |
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| 423 | DO jj = 1, jpjm1 ! criteria: rho_up > rho_down |
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| 424 | DO ji = 1, fs_jpim1 ! vector opt. |
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[4990] | 425 | ! ! i-direction |
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[2528] | 426 | ! down-slope T-point i/k-index (deep) & up-slope T-point i/k-index (shelf) |
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[4990] | 427 | iid = ji + MAX( 0, mgrhu(ji,jj) ) |
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| 428 | iis = ji + 1 - MAX( 0, mgrhu(ji,jj) ) |
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[2528] | 429 | ! |
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[4990] | 430 | ikud = mbku_d(ji,jj) |
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| 431 | ikus = mbku(ji,jj) |
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[2528] | 432 | ! |
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[4990] | 433 | za = zab(ji+1,jj,jp_tem) + zab(ji,jj,jp_tem) ! 2*(alpha,beta) at u-point |
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| 434 | zb = zab(ji+1,jj,jp_sal) + zab(ji,jj,jp_sal) |
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| 435 | ! ! masked bottom density gradient |
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| 436 | zgdrho = 0.5 * ( za * ( zts(iid,jj,jp_tem) - zts(iis,jj,jp_tem) ) & |
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| 437 | & - zb * ( zts(iid,jj,jp_sal) - zts(iis,jj,jp_sal) ) ) * umask(ji,jj,1) |
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| 438 | zgdrho = MAX( 0.e0, zgdrho ) ! only if shelf is denser than deep |
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| 439 | ! |
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| 440 | ! ! bbl transport (down-slope direction) |
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[2528] | 441 | utr_bbl(ji,jj) = e2u(ji,jj) * e3u_bbl_0(ji,jj) * zgbbl * zgdrho * REAL( mgrhu(ji,jj) ) |
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| 442 | ! |
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[4990] | 443 | ! ! j-direction |
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[2528] | 444 | ! down-slope T-point j/k-index (deep) & of the up -slope T-point j/k-index (shelf) |
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[4990] | 445 | ijd = jj + MAX( 0, mgrhv(ji,jj) ) |
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| 446 | ijs = jj + 1 - MAX( 0, mgrhv(ji,jj) ) |
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[2528] | 447 | ! |
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[4990] | 448 | ikvd = mbkv_d(ji,jj) |
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| 449 | ikvs = mbkv(ji,jj) |
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[2528] | 450 | ! |
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[4990] | 451 | za = zab(ji,jj+1,jp_tem) + zab(ji,jj,jp_tem) ! 2*(alpha,beta) at v-point |
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| 452 | zb = zab(ji,jj+1,jp_sal) + zab(ji,jj,jp_sal) |
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| 453 | ! ! masked bottom density gradient |
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| 454 | zgdrho = 0.5 * ( za * ( zts(ji,ijd,jp_tem) - zts(ji,ijs,jp_tem) ) & |
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| 455 | & - zb * ( zts(ji,ijd,jp_sal) - zts(ji,ijs,jp_sal) ) ) * vmask(ji,jj,1) |
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| 456 | zgdrho = MAX( 0.e0, zgdrho ) ! only if shelf is denser than deep |
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| 457 | ! |
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| 458 | ! ! bbl transport (down-slope direction) |
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[2528] | 459 | vtr_bbl(ji,jj) = e1v(ji,jj) * e3v_bbl_0(ji,jj) * zgbbl * zgdrho * REAL( mgrhv(ji,jj) ) |
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| 460 | END DO |
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| 461 | END DO |
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[3] | 462 | END SELECT |
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[2528] | 463 | ! |
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[3] | 464 | ENDIF |
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[503] | 465 | ! |
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[2528] | 466 | END SUBROUTINE bbl |
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[3] | 467 | |
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| 468 | |
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| 469 | SUBROUTINE tra_bbl_init |
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| 470 | !!---------------------------------------------------------------------- |
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| 471 | !! *** ROUTINE tra_bbl_init *** |
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| 472 | !! |
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| 473 | !! ** Purpose : Initialization for the bottom boundary layer scheme. |
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| 474 | !! |
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| 475 | !! ** Method : Read the nambbl namelist and check the parameters |
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[3294] | 476 | !! called by nemo_init at the first timestep (kit000) |
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[3] | 477 | !!---------------------------------------------------------------------- |
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[9019] | 478 | INTEGER :: ji, jj ! dummy loop indices |
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| 479 | INTEGER :: ii0, ii1, ij0, ij1, ios ! local integer |
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[9094] | 480 | REAL(wp), DIMENSION(jpi,jpj) :: zmbku, zmbkv ! workspace |
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[9019] | 481 | !! |
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| 482 | NAMELIST/nambbl/ ln_trabbl, nn_bbl_ldf, nn_bbl_adv, rn_ahtbbl, rn_gambbl |
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[3] | 483 | !!---------------------------------------------------------------------- |
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[3294] | 484 | ! |
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[4147] | 485 | REWIND( numnam_ref ) ! Namelist nambbl in reference namelist : Bottom boundary layer scheme |
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| 486 | READ ( numnam_ref, nambbl, IOSTAT = ios, ERR = 901) |
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[11536] | 487 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nambbl in reference namelist' ) |
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[6140] | 488 | ! |
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[4147] | 489 | REWIND( numnam_cfg ) ! Namelist nambbl in configuration namelist : Bottom boundary layer scheme |
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| 490 | READ ( numnam_cfg, nambbl, IOSTAT = ios, ERR = 902 ) |
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[11536] | 491 | 902 IF( ios > 0 ) CALL ctl_nam ( ios , 'nambbl in configuration namelist' ) |
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[4624] | 492 | IF(lwm) WRITE ( numond, nambbl ) |
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[2528] | 493 | ! |
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| 494 | l_bbl = .TRUE. !* flag to compute bbl coef and transport |
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| 495 | ! |
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| 496 | IF(lwp) THEN !* Parameter control and print |
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[3] | 497 | WRITE(numout,*) |
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[2528] | 498 | WRITE(numout,*) 'tra_bbl_init : bottom boundary layer initialisation' |
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[3] | 499 | WRITE(numout,*) '~~~~~~~~~~~~' |
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[9019] | 500 | WRITE(numout,*) ' Namelist nambbl : set bbl parameters' |
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| 501 | WRITE(numout,*) ' bottom boundary layer flag ln_trabbl = ', ln_trabbl |
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[3] | 502 | ENDIF |
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[9019] | 503 | IF( .NOT.ln_trabbl ) RETURN |
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| 504 | ! |
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| 505 | IF(lwp) THEN |
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| 506 | WRITE(numout,*) ' diffusive bbl (=1) or not (=0) nn_bbl_ldf = ', nn_bbl_ldf |
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| 507 | WRITE(numout,*) ' advective bbl (=1/2) or not (=0) nn_bbl_adv = ', nn_bbl_adv |
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| 508 | WRITE(numout,*) ' diffusive bbl coefficient rn_ahtbbl = ', rn_ahtbbl, ' m2/s' |
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| 509 | WRITE(numout,*) ' advective bbl coefficient rn_gambbl = ', rn_gambbl, ' s' |
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| 510 | ENDIF |
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| 511 | ! |
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[2715] | 512 | ! ! allocate trabbl arrays |
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| 513 | IF( tra_bbl_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'tra_bbl_init : unable to allocate arrays' ) |
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[9019] | 514 | ! |
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[2528] | 515 | IF( nn_bbl_adv == 1 ) WRITE(numout,*) ' * Advective BBL using upper velocity' |
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| 516 | IF( nn_bbl_adv == 2 ) WRITE(numout,*) ' * Advective BBL using velocity = F( delta rho)' |
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[9019] | 517 | ! |
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[2528] | 518 | ! !* vertical index of "deep" bottom u- and v-points |
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| 519 | DO jj = 1, jpjm1 ! (the "shelf" bottom k-indices are mbku and mbkv) |
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| 520 | DO ji = 1, jpim1 |
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| 521 | mbku_d(ji,jj) = MAX( mbkt(ji+1,jj ) , mbkt(ji,jj) ) ! >= 1 as mbkt=1 over land |
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| 522 | mbkv_d(ji,jj) = MAX( mbkt(ji ,jj+1) , mbkt(ji,jj) ) |
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[3] | 523 | END DO |
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| 524 | END DO |
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[4990] | 525 | ! converte into REAL to use lbc_lnk ; impose a min value of 1 as a zero can be set in lbclnk |
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[9094] | 526 | zmbku(:,:) = REAL( mbku_d(:,:), wp ) ; zmbkv(:,:) = REAL( mbkv_d(:,:), wp ) |
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[10425] | 527 | CALL lbc_lnk_multi( 'trabbl', zmbku,'U',1., zmbkv,'V',1.) |
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[9919] | 528 | mbku_d(:,:) = MAX( INT( zmbku(:,:) ), 1 ) ; mbkv_d(:,:) = MAX( NINT( zmbkv(:,:) ), 1 ) |
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[9019] | 529 | ! |
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[9168] | 530 | ! !* sign of grad(H) at u- and v-points; zero if grad(H) = 0 |
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[8509] | 531 | mgrhu(:,:) = 0 ; mgrhv(:,:) = 0 |
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[3764] | 532 | DO jj = 1, jpjm1 |
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[3] | 533 | DO ji = 1, jpim1 |
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[8509] | 534 | IF( gdept_0(ji+1,jj,mbkt(ji+1,jj)) - gdept_0(ji,jj,mbkt(ji,jj)) /= 0._wp ) THEN |
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| 535 | mgrhu(ji,jj) = INT( SIGN( 1.e0, gdept_0(ji+1,jj,mbkt(ji+1,jj)) - gdept_0(ji,jj,mbkt(ji,jj)) ) ) |
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| 536 | ENDIF |
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| 537 | ! |
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| 538 | IF( gdept_0(ji,jj+1,mbkt(ji,jj+1)) - gdept_0(ji,jj,mbkt(ji,jj)) /= 0._wp ) THEN |
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| 539 | mgrhv(ji,jj) = INT( SIGN( 1.e0, gdept_0(ji,jj+1,mbkt(ji,jj+1)) - gdept_0(ji,jj,mbkt(ji,jj)) ) ) |
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| 540 | ENDIF |
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[3] | 541 | END DO |
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| 542 | END DO |
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[7646] | 543 | ! |
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[3764] | 544 | DO jj = 1, jpjm1 !* bbl thickness at u- (v-) point |
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[4990] | 545 | DO ji = 1, jpim1 ! minimum of top & bottom e3u_0 (e3v_0) |
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[4292] | 546 | e3u_bbl_0(ji,jj) = MIN( e3u_0(ji,jj,mbkt(ji+1,jj )), e3u_0(ji,jj,mbkt(ji,jj)) ) |
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| 547 | e3v_bbl_0(ji,jj) = MIN( e3v_0(ji,jj,mbkt(ji ,jj+1)), e3v_0(ji,jj,mbkt(ji,jj)) ) |
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[3764] | 548 | END DO |
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[2528] | 549 | END DO |
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[10425] | 550 | CALL lbc_lnk_multi( 'trabbl', e3u_bbl_0, 'U', 1. , e3v_bbl_0, 'V', 1. ) ! lateral boundary conditions |
---|
[7646] | 551 | ! |
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[3764] | 552 | ! !* masked diffusive flux coefficients |
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[7753] | 553 | ahu_bbl_0(:,:) = rn_ahtbbl * e2_e1u(:,:) * e3u_bbl_0(:,:) * umask(:,:,1) |
---|
| 554 | ahv_bbl_0(:,:) = rn_ahtbbl * e1_e2v(:,:) * e3v_bbl_0(:,:) * vmask(:,:,1) |
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[503] | 555 | ! |
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[3] | 556 | END SUBROUTINE tra_bbl_init |
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| 557 | |
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| 558 | !!====================================================================== |
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| 559 | END MODULE trabbl |
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