| [3] | 1 | MODULE tranpc |
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| 2 | !!============================================================================== |
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| 3 | !! *** MODULE tranpc *** |
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| [4990] | 4 | !! Ocean active tracers: non penetrative convective adjustment scheme |
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| [3] | 5 | !!============================================================================== |
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| [1537] | 6 | !! History : 1.0 ! 1990-09 (G. Madec) Original code |
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| 7 | !! ! 1996-01 (G. Madec) statement function for e3 |
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| 8 | !! NEMO 1.0 ! 2002-06 (G. Madec) free form F90 |
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| 9 | !! 3.0 ! 2008-06 (G. Madec) applied on ta, sa and called before tranxt in step.F90 |
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| [2528] | 10 | !! 3.3 ! 2010-05 (C. Ethe, G. Madec) merge TRC-TRA |
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| [5386] | 11 | !! 3.6 ! 2015-05 (L. Brodeau) new algorithm based on local Brunt-Vaisala freq. |
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| [503] | 12 | !!---------------------------------------------------------------------- |
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| [3] | 13 | |
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| 14 | !!---------------------------------------------------------------------- |
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| [6140] | 15 | !! tra_npc : apply the non penetrative convection scheme |
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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 dom_oce ! ocean space and time domain |
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| 19 | USE phycst ! physical constants |
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| 20 | USE zdf_oce ! ocean vertical physics |
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| 21 | USE trd_oce ! ocean active tracer trends |
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| 22 | USE trdtra ! ocean active tracer trends |
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| 23 | USE eosbn2 ! equation of state (eos routine) |
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| [4990] | 24 | ! |
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| [6140] | 25 | USE lbclnk ! lateral boundary conditions (or mpp link) |
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| 26 | USE in_out_manager ! I/O manager |
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| 27 | USE lib_mpp ! MPP library |
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| 28 | USE timing ! Timing |
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| [3] | 29 | |
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| 30 | IMPLICIT NONE |
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| 31 | PRIVATE |
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| 32 | |
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| [4990] | 33 | PUBLIC tra_npc ! routine called by step.F90 |
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| [3] | 34 | |
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| 35 | !! * Substitutions |
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| [12377] | 36 | # include "do_loop_substitute.h90" |
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| [13151] | 37 | # include "domzgr_substitute.h90" |
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| [3] | 38 | !!---------------------------------------------------------------------- |
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| [9598] | 39 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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| [4990] | 40 | !! $Id$ |
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| [10068] | 41 | !! Software governed by the CeCILL license (see ./LICENSE) |
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| [3] | 42 | !!---------------------------------------------------------------------- |
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| 43 | CONTAINS |
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| 44 | |
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| [12377] | 45 | SUBROUTINE tra_npc( kt, Kmm, Krhs, pts, Kaa ) |
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| [3] | 46 | !!---------------------------------------------------------------------- |
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| 47 | !! *** ROUTINE tranpc *** |
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| 48 | !! |
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| [4990] | 49 | !! ** Purpose : Non-penetrative convective adjustment scheme. solve |
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| [1111] | 50 | !! the static instability of the water column on after fields |
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| [3] | 51 | !! while conserving heat and salt contents. |
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| 52 | !! |
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| [4990] | 53 | !! ** Method : updated algorithm able to deal with non-linear equation of state |
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| 54 | !! (i.e. static stability computed locally) |
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| [3] | 55 | !! |
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| [6140] | 56 | !! ** Action : - tsa: after tracers with the application of the npc scheme |
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| [4990] | 57 | !! - send the associated trends for on-line diagnostics (l_trdtra=T) |
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| [3] | 58 | !! |
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| [4990] | 59 | !! References : Madec, et al., 1991, JPO, 21, 9, 1349-1371. |
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| [503] | 60 | !!---------------------------------------------------------------------- |
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| [12377] | 61 | INTEGER, INTENT(in ) :: kt ! ocean time-step index |
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| 62 | INTEGER, INTENT(in ) :: Kmm, Krhs, Kaa ! time level indices |
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| 63 | REAL(wp), DIMENSION(jpi,jpj,jpk,jpts,jpt), INTENT(inout) :: pts ! active tracers and RHS of tracer equation |
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| [2715] | 64 | ! |
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| [503] | 65 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 66 | INTEGER :: inpcc ! number of statically instable water column |
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| [5386] | 67 | INTEGER :: jiter, ikbot, ikp, ikup, ikdown, ilayer, ik_low ! local integers |
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| [4990] | 68 | LOGICAL :: l_bottom_reached, l_column_treated |
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| 69 | REAL(wp) :: zta, zalfa, zsum_temp, zsum_alfa, zaw, zdz, zsum_z |
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| [12489] | 70 | REAL(wp) :: zsa, zbeta, zsum_sali, zsum_beta, zbw, zrw, z1_rDt |
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| [12377] | 71 | REAL(wp), PARAMETER :: zn2_zero = 1.e-14_wp ! acceptance criteria for neutrality (N2==0) |
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| 72 | REAL(wp), DIMENSION( jpk ) :: zvn2 ! vertical profile of N2 at 1 given point... |
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| 73 | REAL(wp), DIMENSION( jpk,jpts) :: zvts, zvab ! vertical profile of T & S , and alpha & betaat 1 given point |
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| [13151] | 74 | REAL(wp), DIMENSION(jpi,jpj,jpk ) :: zn2 ! N^2 |
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| [12377] | 75 | REAL(wp), DIMENSION(jpi,jpj,jpk,jpts) :: zab ! alpha and beta |
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| 76 | REAL(wp), ALLOCATABLE, DIMENSION(:,:,:) :: ztrdt, ztrds ! 3D workspace |
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| [4990] | 77 | ! |
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| [5386] | 78 | LOGICAL, PARAMETER :: l_LB_debug = .FALSE. ! set to true if you want to follow what is |
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| 79 | INTEGER :: ilc1, jlc1, klc1, nncpu ! actually happening in a water column at point "ilc1, jlc1" |
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| 80 | LOGICAL :: lp_monitor_point = .FALSE. ! in CPU domain "nncpu" |
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| [3] | 81 | !!---------------------------------------------------------------------- |
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| [3294] | 82 | ! |
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| [9019] | 83 | IF( ln_timing ) CALL timing_start('tra_npc') |
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| [3294] | 84 | ! |
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| [1537] | 85 | IF( MOD( kt, nn_npc ) == 0 ) THEN |
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| [4990] | 86 | ! |
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| 87 | IF( l_trdtra ) THEN !* Save initial after fields |
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| [9019] | 88 | ALLOCATE( ztrdt(jpi,jpj,jpk) , ztrds(jpi,jpj,jpk) ) |
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| [13151] | 89 | ztrdt(:,:,:) = pts(:,:,:,jp_tem,Kaa) |
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| [12377] | 90 | ztrds(:,:,:) = pts(:,:,:,jp_sal,Kaa) |
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| [216] | 91 | ENDIF |
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| [9019] | 92 | ! |
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| [4990] | 93 | IF( l_LB_debug ) THEN |
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| [5386] | 94 | ! Location of 1 known convection site to follow what's happening in the water column |
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| [13151] | 95 | ilc1 = 45 ; jlc1 = 3 ; ! ORCA2 4x4, Antarctic coast, more than 2 unstable portions in the water column... |
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| [5386] | 96 | nncpu = 1 ; ! the CPU domain contains the convection spot |
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| [13151] | 97 | klc1 = mbkt(ilc1,jlc1) ! bottom of the ocean for debug point... |
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| [4990] | 98 | ENDIF |
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| [9019] | 99 | ! |
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| [12377] | 100 | CALL eos_rab( pts(:,:,:,:,Kaa), zab, Kmm ) ! after alpha and beta (given on T-points) |
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| 101 | CALL bn2 ( pts(:,:,:,:,Kaa), zab, zn2, Kmm ) ! after Brunt-Vaisala (given on W-points) |
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| [9019] | 102 | ! |
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| [4990] | 103 | inpcc = 0 |
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| [9019] | 104 | ! |
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| [12377] | 105 | DO_2D_00_00 |
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| 106 | ! |
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| 107 | IF( tmask(ji,jj,2) == 1 ) THEN ! At least 2 ocean points |
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| [13151] | 108 | ! ! consider one ocean column |
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| [12377] | 109 | zvts(:,jp_tem) = pts(ji,jj,:,jp_tem,Kaa) ! temperature |
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| 110 | zvts(:,jp_sal) = pts(ji,jj,:,jp_sal,Kaa) ! salinity |
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| [4990] | 111 | ! |
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| [13151] | 112 | zvab(:,jp_tem) = zab(ji,jj,:,jp_tem) ! Alpha |
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| 113 | zvab(:,jp_sal) = zab(ji,jj,:,jp_sal) ! Beta |
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| 114 | zvn2(:) = zn2(ji,jj,:) ! N^2 |
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| [12377] | 115 | ! |
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| 116 | IF( l_LB_debug ) THEN !LB debug: |
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| 117 | lp_monitor_point = .FALSE. |
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| 118 | IF( ( ji == ilc1 ).AND.( jj == jlc1 ) ) lp_monitor_point = .TRUE. |
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| 119 | ! writing only if on CPU domain where conv region is: |
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| [13151] | 120 | lp_monitor_point = (narea == nncpu).AND.lp_monitor_point |
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| [12377] | 121 | ENDIF !LB debug end |
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| 122 | ! |
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| 123 | ikbot = mbkt(ji,jj) ! ikbot: ocean bottom T-level |
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| 124 | ikp = 1 ! because N2 is irrelevant at the surface level (will start at ikp=2) |
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| 125 | ilayer = 0 |
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| 126 | jiter = 0 |
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| 127 | l_column_treated = .FALSE. |
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| 128 | ! |
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| 129 | DO WHILE ( .NOT. l_column_treated ) |
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| [6140] | 130 | ! |
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| [12377] | 131 | jiter = jiter + 1 |
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| [13151] | 132 | ! |
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| [12377] | 133 | IF( jiter >= 400 ) EXIT |
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| [6140] | 134 | ! |
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| [12377] | 135 | l_bottom_reached = .FALSE. |
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| [6140] | 136 | ! |
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| [12377] | 137 | DO WHILE ( .NOT. l_bottom_reached ) |
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| [4990] | 138 | ! |
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| [12377] | 139 | ikp = ikp + 1 |
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| [6140] | 140 | ! |
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| [12377] | 141 | !! Testing level ikp for instability |
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| 142 | !! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 143 | IF( zvn2(ikp) < -zn2_zero ) THEN ! Instability found! |
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| [6140] | 144 | ! |
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| [12377] | 145 | ilayer = ilayer + 1 ! yet another instable portion of the water column found.... |
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| [6140] | 146 | ! |
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| [13151] | 147 | IF( lp_monitor_point ) THEN |
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| [12377] | 148 | WRITE(numout,*) |
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| 149 | IF( ilayer == 1 .AND. jiter == 1 ) THEN ! first time a column is spoted with an instability |
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| [5386] | 150 | WRITE(numout,*) |
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| [12377] | 151 | WRITE(numout,*) 'Time step = ',kt,' !!!' |
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| 152 | ENDIF |
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| 153 | WRITE(numout,*) ' * Iteration #',jiter,': found instable portion #',ilayer, & |
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| 154 | & ' in column! Starting at ikp =', ikp |
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| 155 | WRITE(numout,*) ' *** N2 for point (i,j) = ',ji,' , ',jj |
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| 156 | DO jk = 1, klc1 |
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| 157 | WRITE(numout,*) jk, zvn2(jk) |
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| 158 | END DO |
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| 159 | WRITE(numout,*) |
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| 160 | ENDIF |
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| 161 | ! |
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| [13151] | 162 | IF( jiter == 1 ) inpcc = inpcc + 1 |
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| [12377] | 163 | ! |
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| 164 | IF( lp_monitor_point ) WRITE(numout, *) 'Negative N2 at ikp =',ikp,' for layer #', ilayer |
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| 165 | ! |
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| 166 | !! ikup is the uppermost point where mixing will start: |
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| 167 | ikup = ikp - 1 ! ikup is always "at most at ikp-1", less if neutral levels overlying |
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| 168 | ! |
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| 169 | !! If the points above ikp-1 have N2 == 0 they must also be mixed: |
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| 170 | IF( ikp > 2 ) THEN |
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| 171 | DO jk = ikp-1, 2, -1 |
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| 172 | IF( ABS(zvn2(jk)) < zn2_zero ) THEN |
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| 173 | ikup = ikup - 1 ! 1 more upper level has N2=0 and must be added for the mixing |
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| 174 | ELSE |
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| 175 | EXIT |
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| [5386] | 176 | ENDIF |
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| [12377] | 177 | END DO |
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| 178 | ENDIF |
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| 179 | ! |
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| 180 | IF( ikup < 1 ) CALL ctl_stop( 'tra_npc : PROBLEM #1') |
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| 181 | ! |
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| 182 | zsum_temp = 0._wp |
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| 183 | zsum_sali = 0._wp |
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| 184 | zsum_alfa = 0._wp |
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| 185 | zsum_beta = 0._wp |
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| 186 | zsum_z = 0._wp |
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| [13151] | 187 | |
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| [12377] | 188 | DO jk = ikup, ikbot ! Inside the instable (and overlying neutral) portion of the column |
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| [6140] | 189 | ! |
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| [12377] | 190 | zdz = e3t(ji,jj,jk,Kmm) |
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| 191 | zsum_temp = zsum_temp + zvts(jk,jp_tem)*zdz |
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| 192 | zsum_sali = zsum_sali + zvts(jk,jp_sal)*zdz |
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| 193 | zsum_alfa = zsum_alfa + zvab(jk,jp_tem)*zdz |
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| 194 | zsum_beta = zsum_beta + zvab(jk,jp_sal)*zdz |
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| 195 | zsum_z = zsum_z + zdz |
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| [13151] | 196 | ! |
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| [12377] | 197 | IF( jk == ikbot ) EXIT ! avoid array-index overshoot in case ikbot = jpk, cause we're calling jk+1 next line |
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| 198 | !! EXIT when we have reached the last layer that is instable (N2<0) or neutral (N2=0): |
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| 199 | IF( zvn2(jk+1) > zn2_zero ) EXIT |
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| 200 | END DO |
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| [13151] | 201 | |
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| [12377] | 202 | ikdown = jk ! for the current unstable layer, ikdown is the deepest point with a negative or neutral N2 |
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| 203 | IF( ikup == ikdown ) CALL ctl_stop( 'tra_npc : PROBLEM #2') |
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| [5386] | 204 | |
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| [12377] | 205 | ! Mixing Temperature, salinity, alpha and beta from ikup to ikdown included: |
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| 206 | zta = zsum_temp/zsum_z |
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| 207 | zsa = zsum_sali/zsum_z |
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| 208 | zalfa = zsum_alfa/zsum_z |
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| 209 | zbeta = zsum_beta/zsum_z |
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| [4990] | 210 | |
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| [12377] | 211 | IF( lp_monitor_point ) THEN |
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| 212 | WRITE(numout,*) 'MIXED T, S, alfa and beta between ikup =',ikup, & |
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| 213 | & ' and ikdown =',ikdown,', in layer #',ilayer |
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| 214 | WRITE(numout,*) ' => Mean temp. in that portion =', zta |
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| 215 | WRITE(numout,*) ' => Mean sali. in that portion =', zsa |
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| 216 | WRITE(numout,*) ' => Mean Alfa in that portion =', zalfa |
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| 217 | WRITE(numout,*) ' => Mean Beta in that portion =', zbeta |
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| 218 | ENDIF |
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| [4990] | 219 | |
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| [12377] | 220 | !! Homogenaizing the temperature, salinity, alpha and beta in this portion of the column |
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| 221 | DO jk = ikup, ikdown |
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| 222 | zvts(jk,jp_tem) = zta |
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| 223 | zvts(jk,jp_sal) = zsa |
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| 224 | zvab(jk,jp_tem) = zalfa |
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| 225 | zvab(jk,jp_sal) = zbeta |
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| 226 | END DO |
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| [13151] | 227 | |
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| 228 | |
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| [12377] | 229 | !! Updating N2 in the relvant portion of the water column |
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| 230 | !! Temperature, Salinity, Alpha and Beta have been homogenized in the unstable portion |
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| 231 | !! => Need to re-compute N2! will use Alpha and Beta! |
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| [13151] | 232 | |
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| [12377] | 233 | ikup = MAX(2,ikup) ! ikup can never be 1 ! |
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| 234 | ik_low = MIN(ikdown+1,ikbot) ! we must go 1 point deeper than ikdown! |
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| [13151] | 235 | |
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| [12377] | 236 | DO jk = ikup, ik_low ! we must go 1 point deeper than ikdown! |
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| [5386] | 237 | |
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| [12377] | 238 | !! Interpolating alfa and beta at W point: |
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| 239 | zrw = (gdepw(ji,jj,jk ,Kmm) - gdept(ji,jj,jk,Kmm)) & |
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| 240 | & / (gdept(ji,jj,jk-1,Kmm) - gdept(ji,jj,jk,Kmm)) |
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| 241 | zaw = zvab(jk,jp_tem) * (1._wp - zrw) + zvab(jk-1,jp_tem) * zrw |
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| 242 | zbw = zvab(jk,jp_sal) * (1._wp - zrw) + zvab(jk-1,jp_sal) * zrw |
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| [5386] | 243 | |
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| [12377] | 244 | !! N2 at W point, doing exactly as in eosbn2.F90: |
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| 245 | zvn2(jk) = grav*( zaw * ( zvts(jk-1,jp_tem) - zvts(jk,jp_tem) ) & |
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| 246 | & - zbw * ( zvts(jk-1,jp_sal) - zvts(jk,jp_sal) ) ) & |
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| 247 | & / e3w(ji,jj,jk,Kmm) * tmask(ji,jj,jk) |
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| [5386] | 248 | |
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| [12377] | 249 | !! OR, faster => just considering the vertical gradient of density |
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| 250 | !! as only the signa maters... |
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| 251 | !zvn2(jk) = ( zaw * ( zvts(jk-1,jp_tem) - zvts(jk,jp_tem) ) & |
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| 252 | ! & - zbw * ( zvts(jk-1,jp_sal) - zvts(jk,jp_sal) ) ) |
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| [5386] | 253 | |
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| [12377] | 254 | END DO |
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| [13151] | 255 | |
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| [12377] | 256 | ikp = MIN(ikdown+1,ikbot) |
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| [5386] | 257 | |
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| [13151] | 258 | |
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| [12377] | 259 | ENDIF !IF( zvn2(ikp) < 0. ) |
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| [5386] | 260 | |
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| 261 | |
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| [12377] | 262 | IF( ikp == ikbot ) l_bottom_reached = .TRUE. |
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| 263 | ! |
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| 264 | END DO ! DO WHILE ( .NOT. l_bottom_reached ) |
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| [4990] | 265 | |
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| [12377] | 266 | IF( ikp /= ikbot ) CALL ctl_stop( 'tra_npc : PROBLEM #3') |
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| [13151] | 267 | |
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| [12377] | 268 | ! ******* At this stage ikp == ikbot ! ******* |
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| [13151] | 269 | |
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| [12377] | 270 | IF( ilayer > 0 ) THEN !! least an unstable layer has been found |
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| 271 | ! |
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| 272 | IF( lp_monitor_point ) THEN |
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| 273 | WRITE(numout,*) |
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| 274 | WRITE(numout,*) 'After ',jiter,' iteration(s), we neutralized ',ilayer,' instable layer(s)' |
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| 275 | WRITE(numout,*) ' ==> N2 at i,j=',ji,',',jj,' now looks like this:' |
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| 276 | DO jk = 1, klc1 |
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| 277 | WRITE(numout,*) jk, zvn2(jk) |
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| 278 | END DO |
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| 279 | WRITE(numout,*) |
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| [4990] | 280 | ENDIF |
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| 281 | ! |
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| [12377] | 282 | ikp = 1 ! starting again at the surface for the next iteration |
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| 283 | ilayer = 0 |
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| 284 | ENDIF |
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| 285 | ! |
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| 286 | IF( ikp >= ikbot ) l_column_treated = .TRUE. |
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| 287 | ! |
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| 288 | END DO ! DO WHILE ( .NOT. l_column_treated ) |
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| [4990] | 289 | |
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| [12377] | 290 | !! Updating pts: |
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| 291 | pts(ji,jj,:,jp_tem,Kaa) = zvts(:,jp_tem) |
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| 292 | pts(ji,jj,:,jp_sal,Kaa) = zvts(:,jp_sal) |
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| [4990] | 293 | |
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| [12377] | 294 | !! LB: Potentially some other global variable beside theta and S can be treated here |
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| 295 | !! like BGC tracers. |
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| [4990] | 296 | |
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| [12377] | 297 | IF( lp_monitor_point ) WRITE(numout,*) |
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| [4990] | 298 | |
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| [12377] | 299 | ENDIF ! IF( tmask(ji,jj,3) == 1 ) THEN |
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| [4990] | 300 | |
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| [12377] | 301 | END_2D |
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| [4990] | 302 | ! |
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| 303 | IF( l_trdtra ) THEN ! send the Non penetrative mixing trends for diagnostic |
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| [12489] | 304 | z1_rDt = 1._wp / (2._wp * rn_Dt) |
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| 305 | ztrdt(:,:,:) = ( pts(:,:,:,jp_tem,Kaa) - ztrdt(:,:,:) ) * z1_rDt |
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| 306 | ztrds(:,:,:) = ( pts(:,:,:,jp_sal,Kaa) - ztrds(:,:,:) ) * z1_rDt |
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| [12377] | 307 | CALL trd_tra( kt, Kmm, Krhs, 'TRA', jp_tem, jptra_npc, ztrdt ) |
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| 308 | CALL trd_tra( kt, Kmm, Krhs, 'TRA', jp_sal, jptra_npc, ztrds ) |
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| [9019] | 309 | DEALLOCATE( ztrdt, ztrds ) |
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| [216] | 310 | ENDIF |
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| [4990] | 311 | ! |
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| [12377] | 312 | CALL lbc_lnk_multi( 'tranpc', pts(:,:,:,jp_tem,Kaa), 'T', 1., pts(:,:,:,jp_sal,Kaa), 'T', 1. ) |
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| [4990] | 313 | ! |
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| [5386] | 314 | IF( lwp .AND. l_LB_debug ) THEN |
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| 315 | WRITE(numout,*) 'Exiting tra_npc , kt = ',kt,', => numb. of statically instable water-columns: ', inpcc |
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| 316 | WRITE(numout,*) |
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| [3] | 317 | ENDIF |
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| [503] | 318 | ! |
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| [4990] | 319 | ENDIF ! IF( MOD( kt, nn_npc ) == 0 ) THEN |
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| [503] | 320 | ! |
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| [9019] | 321 | IF( ln_timing ) CALL timing_stop('tra_npc') |
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| [3294] | 322 | ! |
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| [3] | 323 | END SUBROUTINE tra_npc |
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| 324 | |
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| 325 | !!====================================================================== |
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| 326 | END MODULE tranpc |
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