[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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[4990] | 36 | # include "vectopt_loop_substitute.h90" |
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[3] | 37 | !!---------------------------------------------------------------------- |
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[4990] | 38 | !! NEMO/OPA 3.6 , NEMO Consortium (2014) |
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| 39 | !! $Id$ |
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[2528] | 40 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[3] | 41 | !!---------------------------------------------------------------------- |
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| 42 | CONTAINS |
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| 43 | |
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| 44 | SUBROUTINE tra_npc( kt ) |
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| 45 | !!---------------------------------------------------------------------- |
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| 46 | !! *** ROUTINE tranpc *** |
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| 47 | !! |
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[4990] | 48 | !! ** Purpose : Non-penetrative convective adjustment scheme. solve |
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[1111] | 49 | !! the static instability of the water column on after fields |
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[3] | 50 | !! while conserving heat and salt contents. |
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| 51 | !! |
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[4990] | 52 | !! ** Method : updated algorithm able to deal with non-linear equation of state |
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| 53 | !! (i.e. static stability computed locally) |
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[3] | 54 | !! |
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[6140] | 55 | !! ** Action : - tsa: after tracers with the application of the npc scheme |
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[4990] | 56 | !! - send the associated trends for on-line diagnostics (l_trdtra=T) |
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[3] | 57 | !! |
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[4990] | 58 | !! References : Madec, et al., 1991, JPO, 21, 9, 1349-1371. |
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[503] | 59 | !!---------------------------------------------------------------------- |
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| 60 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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[2715] | 61 | ! |
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[503] | 62 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 63 | INTEGER :: inpcc ! number of statically instable water column |
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[5386] | 64 | INTEGER :: jiter, ikbot, ikp, ikup, ikdown, ilayer, ik_low ! local integers |
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[4990] | 65 | LOGICAL :: l_bottom_reached, l_column_treated |
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| 66 | REAL(wp) :: zta, zalfa, zsum_temp, zsum_alfa, zaw, zdz, zsum_z |
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| 67 | REAL(wp) :: zsa, zbeta, zsum_sali, zsum_beta, zbw, zrw, z1_r2dt |
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[9019] | 68 | REAL(wp), PARAMETER :: zn2_zero = 1.e-14_wp ! acceptance criteria for neutrality (N2==0) |
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| 69 | REAL(wp), DIMENSION( jpk ) :: zvn2 ! vertical profile of N2 at 1 given point... |
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| 70 | REAL(wp), DIMENSION( jpk,jpts) :: zvts, zvab ! vertical profile of T & S , and alpha & betaat 1 given point |
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| 71 | REAL(wp), DIMENSION(jpi,jpj,jpk ) :: zn2 ! N^2 |
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| 72 | REAL(wp), DIMENSION(jpi,jpj,jpk,jpts) :: zab ! alpha and beta |
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| 73 | REAL(wp), ALLOCATABLE, DIMENSION(:,:,:) :: ztrdt, ztrds ! 3D workspace |
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[4990] | 74 | ! |
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[5386] | 75 | LOGICAL, PARAMETER :: l_LB_debug = .FALSE. ! set to true if you want to follow what is |
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| 76 | INTEGER :: ilc1, jlc1, klc1, nncpu ! actually happening in a water column at point "ilc1, jlc1" |
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| 77 | LOGICAL :: lp_monitor_point = .FALSE. ! in CPU domain "nncpu" |
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[3] | 78 | !!---------------------------------------------------------------------- |
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[3294] | 79 | ! |
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[9019] | 80 | IF( ln_timing ) CALL timing_start('tra_npc') |
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[3294] | 81 | ! |
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[1537] | 82 | IF( MOD( kt, nn_npc ) == 0 ) THEN |
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[4990] | 83 | ! |
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| 84 | IF( l_trdtra ) THEN !* Save initial after fields |
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[9019] | 85 | ALLOCATE( ztrdt(jpi,jpj,jpk) , ztrds(jpi,jpj,jpk) ) |
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[2715] | 86 | ztrdt(:,:,:) = tsa(:,:,:,jp_tem) |
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| 87 | ztrds(:,:,:) = tsa(:,:,:,jp_sal) |
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[216] | 88 | ENDIF |
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[9019] | 89 | ! |
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[4990] | 90 | IF( l_LB_debug ) THEN |
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[5386] | 91 | ! Location of 1 known convection site to follow what's happening in the water column |
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| 92 | ilc1 = 45 ; jlc1 = 3 ; ! ORCA2 4x4, Antarctic coast, more than 2 unstable portions in the water column... |
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| 93 | nncpu = 1 ; ! the CPU domain contains the convection spot |
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[4990] | 94 | klc1 = mbkt(ilc1,jlc1) ! bottom of the ocean for debug point... |
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| 95 | ENDIF |
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[9019] | 96 | ! |
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[5386] | 97 | CALL eos_rab( tsa, zab ) ! after alpha and beta (given on T-points) |
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| 98 | CALL bn2 ( tsa, zab, zn2 ) ! after Brunt-Vaisala (given on W-points) |
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[9019] | 99 | ! |
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[4990] | 100 | inpcc = 0 |
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[9019] | 101 | ! |
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[4990] | 102 | DO jj = 2, jpjm1 ! interior column only |
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| 103 | DO ji = fs_2, fs_jpim1 |
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| 104 | ! |
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| 105 | IF( tmask(ji,jj,2) == 1 ) THEN ! At least 2 ocean points |
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| 106 | ! ! consider one ocean column |
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| 107 | zvts(:,jp_tem) = tsa(ji,jj,:,jp_tem) ! temperature |
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| 108 | zvts(:,jp_sal) = tsa(ji,jj,:,jp_sal) ! salinity |
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[6140] | 109 | ! |
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[4990] | 110 | zvab(:,jp_tem) = zab(ji,jj,:,jp_tem) ! Alpha |
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| 111 | zvab(:,jp_sal) = zab(ji,jj,:,jp_sal) ! Beta |
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| 112 | zvn2(:) = zn2(ji,jj,:) ! N^2 |
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[6140] | 113 | ! |
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[4990] | 114 | IF( l_LB_debug ) THEN !LB debug: |
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| 115 | lp_monitor_point = .FALSE. |
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| 116 | IF( ( ji == ilc1 ).AND.( jj == jlc1 ) ) lp_monitor_point = .TRUE. |
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| 117 | ! writing only if on CPU domain where conv region is: |
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[5386] | 118 | lp_monitor_point = (narea == nncpu).AND.lp_monitor_point |
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[4990] | 119 | ENDIF !LB debug end |
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[6140] | 120 | ! |
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[4990] | 121 | ikbot = mbkt(ji,jj) ! ikbot: ocean bottom T-level |
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[5386] | 122 | ikp = 1 ! because N2 is irrelevant at the surface level (will start at ikp=2) |
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[4990] | 123 | ilayer = 0 |
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| 124 | jiter = 0 |
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| 125 | l_column_treated = .FALSE. |
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[6140] | 126 | ! |
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[4990] | 127 | DO WHILE ( .NOT. l_column_treated ) |
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| 128 | ! |
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| 129 | jiter = jiter + 1 |
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[6140] | 130 | ! |
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[4990] | 131 | IF( jiter >= 400 ) EXIT |
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[6140] | 132 | ! |
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[4990] | 133 | l_bottom_reached = .FALSE. |
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[6140] | 134 | ! |
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[4990] | 135 | DO WHILE ( .NOT. l_bottom_reached ) |
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[6140] | 136 | ! |
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[5386] | 137 | ikp = ikp + 1 |
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[6140] | 138 | ! |
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[5386] | 139 | !! Testing level ikp for instability |
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[4990] | 140 | !! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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[5386] | 141 | IF( zvn2(ikp) < -zn2_zero ) THEN ! Instability found! |
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[6140] | 142 | ! |
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[5386] | 143 | ilayer = ilayer + 1 ! yet another instable portion of the water column found.... |
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[6140] | 144 | ! |
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[5386] | 145 | IF( lp_monitor_point ) THEN |
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| 146 | WRITE(numout,*) |
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| 147 | IF( ilayer == 1 .AND. jiter == 1 ) THEN ! first time a column is spoted with an instability |
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| 148 | WRITE(numout,*) |
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| 149 | WRITE(numout,*) 'Time step = ',kt,' !!!' |
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| 150 | ENDIF |
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| 151 | WRITE(numout,*) ' * Iteration #',jiter,': found instable portion #',ilayer, & |
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| 152 | & ' in column! Starting at ikp =', ikp |
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| 153 | WRITE(numout,*) ' *** N2 for point (i,j) = ',ji,' , ',jj |
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| 154 | DO jk = 1, klc1 |
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| 155 | WRITE(numout,*) jk, zvn2(jk) |
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| 156 | END DO |
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| 157 | WRITE(numout,*) |
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| 158 | ENDIF |
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[6140] | 159 | ! |
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[5386] | 160 | IF( jiter == 1 ) inpcc = inpcc + 1 |
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[6140] | 161 | ! |
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[5386] | 162 | IF( lp_monitor_point ) WRITE(numout, *) 'Negative N2 at ikp =',ikp,' for layer #', ilayer |
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[6140] | 163 | ! |
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[5386] | 164 | !! ikup is the uppermost point where mixing will start: |
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| 165 | ikup = ikp - 1 ! ikup is always "at most at ikp-1", less if neutral levels overlying |
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[6140] | 166 | ! |
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[5386] | 167 | !! If the points above ikp-1 have N2 == 0 they must also be mixed: |
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| 168 | IF( ikp > 2 ) THEN |
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| 169 | DO jk = ikp-1, 2, -1 |
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| 170 | IF( ABS(zvn2(jk)) < zn2_zero ) THEN |
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| 171 | ikup = ikup - 1 ! 1 more upper level has N2=0 and must be added for the mixing |
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| 172 | ELSE |
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| 173 | EXIT |
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| 174 | ENDIF |
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| 175 | END DO |
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| 176 | ENDIF |
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[6140] | 177 | ! |
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[5386] | 178 | IF( ikup < 1 ) CALL ctl_stop( 'tra_npc : PROBLEM #1') |
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[6140] | 179 | ! |
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[4990] | 180 | zsum_temp = 0._wp |
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| 181 | zsum_sali = 0._wp |
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| 182 | zsum_alfa = 0._wp |
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| 183 | zsum_beta = 0._wp |
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| 184 | zsum_z = 0._wp |
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| 185 | |
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[5386] | 186 | DO jk = ikup, ikbot ! Inside the instable (and overlying neutral) portion of the column |
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[4990] | 187 | ! |
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[6140] | 188 | zdz = e3t_n(ji,jj,jk) |
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[4990] | 189 | zsum_temp = zsum_temp + zvts(jk,jp_tem)*zdz |
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| 190 | zsum_sali = zsum_sali + zvts(jk,jp_sal)*zdz |
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| 191 | zsum_alfa = zsum_alfa + zvab(jk,jp_tem)*zdz |
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| 192 | zsum_beta = zsum_beta + zvab(jk,jp_sal)*zdz |
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| 193 | zsum_z = zsum_z + zdz |
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[5386] | 194 | ! |
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| 195 | IF( jk == ikbot ) EXIT ! avoid array-index overshoot in case ikbot = jpk, cause we're calling jk+1 next line |
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| 196 | !! EXIT when we have reached the last layer that is instable (N2<0) or neutral (N2=0): |
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| 197 | IF( zvn2(jk+1) > zn2_zero ) EXIT |
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[4990] | 198 | END DO |
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| 199 | |
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[5386] | 200 | ikdown = jk ! for the current unstable layer, ikdown is the deepest point with a negative or neutral N2 |
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| 201 | IF( ikup == ikdown ) CALL ctl_stop( 'tra_npc : PROBLEM #2') |
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| 202 | |
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| 203 | ! Mixing Temperature, salinity, alpha and beta from ikup to ikdown included: |
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[4990] | 204 | zta = zsum_temp/zsum_z |
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| 205 | zsa = zsum_sali/zsum_z |
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| 206 | zalfa = zsum_alfa/zsum_z |
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| 207 | zbeta = zsum_beta/zsum_z |
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| 208 | |
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[5386] | 209 | IF( lp_monitor_point ) THEN |
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| 210 | WRITE(numout,*) 'MIXED T, S, alfa and beta between ikup =',ikup, & |
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| 211 | & ' and ikdown =',ikdown,', in layer #',ilayer |
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[4990] | 212 | WRITE(numout,*) ' => Mean temp. in that portion =', zta |
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| 213 | WRITE(numout,*) ' => Mean sali. in that portion =', zsa |
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[5386] | 214 | WRITE(numout,*) ' => Mean Alfa in that portion =', zalfa |
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[4990] | 215 | WRITE(numout,*) ' => Mean Beta in that portion =', zbeta |
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| 216 | ENDIF |
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| 217 | |
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| 218 | !! Homogenaizing the temperature, salinity, alpha and beta in this portion of the column |
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| 219 | DO jk = ikup, ikdown |
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| 220 | zvts(jk,jp_tem) = zta |
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| 221 | zvts(jk,jp_sal) = zsa |
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| 222 | zvab(jk,jp_tem) = zalfa |
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| 223 | zvab(jk,jp_sal) = zbeta |
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| 224 | END DO |
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[5386] | 225 | |
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| 226 | |
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| 227 | !! Updating N2 in the relvant portion of the water column |
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| 228 | !! Temperature, Salinity, Alpha and Beta have been homogenized in the unstable portion |
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| 229 | !! => Need to re-compute N2! will use Alpha and Beta! |
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| 230 | |
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| 231 | ikup = MAX(2,ikup) ! ikup can never be 1 ! |
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| 232 | ik_low = MIN(ikdown+1,ikbot) ! we must go 1 point deeper than ikdown! |
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| 233 | |
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| 234 | DO jk = ikup, ik_low ! we must go 1 point deeper than ikdown! |
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| 235 | |
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| 236 | !! Interpolating alfa and beta at W point: |
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[6140] | 237 | zrw = (gdepw_n(ji,jj,jk ) - gdept_n(ji,jj,jk)) & |
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| 238 | & / (gdept_n(ji,jj,jk-1) - gdept_n(ji,jj,jk)) |
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[5386] | 239 | zaw = zvab(jk,jp_tem) * (1._wp - zrw) + zvab(jk-1,jp_tem) * zrw |
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| 240 | zbw = zvab(jk,jp_sal) * (1._wp - zrw) + zvab(jk-1,jp_sal) * zrw |
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| 241 | |
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| 242 | !! N2 at W point, doing exactly as in eosbn2.F90: |
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| 243 | zvn2(jk) = grav*( zaw * ( zvts(jk-1,jp_tem) - zvts(jk,jp_tem) ) & |
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| 244 | & - zbw * ( zvts(jk-1,jp_sal) - zvts(jk,jp_sal) ) ) & |
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[6140] | 245 | & / e3w_n(ji,jj,jk) * tmask(ji,jj,jk) |
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[5386] | 246 | |
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| 247 | !! OR, faster => just considering the vertical gradient of density |
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| 248 | !! as only the signa maters... |
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| 249 | !zvn2(jk) = ( zaw * ( zvts(jk-1,jp_tem) - zvts(jk,jp_tem) ) & |
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| 250 | ! & - zbw * ( zvts(jk-1,jp_sal) - zvts(jk,jp_sal) ) ) |
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| 251 | |
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| 252 | END DO |
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| 253 | |
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| 254 | ikp = MIN(ikdown+1,ikbot) |
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| 255 | |
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| 256 | |
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| 257 | ENDIF !IF( zvn2(ikp) < 0. ) |
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| 258 | |
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| 259 | |
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| 260 | IF( ikp == ikbot ) l_bottom_reached = .TRUE. |
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[503] | 261 | ! |
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[4990] | 262 | END DO ! DO WHILE ( .NOT. l_bottom_reached ) |
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| 263 | |
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[5386] | 264 | IF( ikp /= ikbot ) CALL ctl_stop( 'tra_npc : PROBLEM #3') |
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[4990] | 265 | |
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[5386] | 266 | ! ******* At this stage ikp == ikbot ! ******* |
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[4990] | 267 | |
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[5386] | 268 | IF( ilayer > 0 ) THEN !! least an unstable layer has been found |
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[503] | 269 | ! |
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[5386] | 270 | IF( lp_monitor_point ) THEN |
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| 271 | WRITE(numout,*) |
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| 272 | WRITE(numout,*) 'After ',jiter,' iteration(s), we neutralized ',ilayer,' instable layer(s)' |
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| 273 | WRITE(numout,*) ' ==> N2 at i,j=',ji,',',jj,' now looks like this:' |
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[4990] | 274 | DO jk = 1, klc1 |
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| 275 | WRITE(numout,*) jk, zvn2(jk) |
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| 276 | END DO |
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[5386] | 277 | WRITE(numout,*) |
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[3] | 278 | ENDIF |
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[5386] | 279 | ! |
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| 280 | ikp = 1 ! starting again at the surface for the next iteration |
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[4990] | 281 | ilayer = 0 |
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| 282 | ENDIF |
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| 283 | ! |
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[5386] | 284 | IF( ikp >= ikbot ) l_column_treated = .TRUE. |
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[4990] | 285 | ! |
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| 286 | END DO ! DO WHILE ( .NOT. l_column_treated ) |
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| 287 | |
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| 288 | !! Updating tsa: |
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| 289 | tsa(ji,jj,:,jp_tem) = zvts(:,jp_tem) |
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| 290 | tsa(ji,jj,:,jp_sal) = zvts(:,jp_sal) |
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| 291 | |
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[5386] | 292 | !! LB: Potentially some other global variable beside theta and S can be treated here |
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| 293 | !! like BGC tracers. |
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[4990] | 294 | |
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[5386] | 295 | IF( lp_monitor_point ) WRITE(numout,*) |
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[4990] | 296 | |
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| 297 | ENDIF ! IF( tmask(ji,jj,3) == 1 ) THEN |
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| 298 | |
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| 299 | END DO ! ji |
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| 300 | END DO ! jj |
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| 301 | ! |
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| 302 | IF( l_trdtra ) THEN ! send the Non penetrative mixing trends for diagnostic |
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| 303 | z1_r2dt = 1._wp / (2._wp * rdt) |
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| 304 | ztrdt(:,:,:) = ( tsa(:,:,:,jp_tem) - ztrdt(:,:,:) ) * z1_r2dt |
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| 305 | ztrds(:,:,:) = ( tsa(:,:,:,jp_sal) - ztrds(:,:,:) ) * z1_r2dt |
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| 306 | CALL trd_tra( kt, 'TRA', jp_tem, jptra_npc, ztrdt ) |
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| 307 | CALL trd_tra( kt, 'TRA', jp_sal, jptra_npc, ztrds ) |
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[9019] | 308 | DEALLOCATE( ztrdt, ztrds ) |
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[216] | 309 | ENDIF |
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[4990] | 310 | ! |
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[9094] | 311 | CALL lbc_lnk_multi( tsa(:,:,:,jp_tem), 'T', 1., tsa(:,:,:,jp_sal), 'T', 1. ) |
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[4990] | 312 | ! |
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[5386] | 313 | IF( lwp .AND. l_LB_debug ) THEN |
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| 314 | WRITE(numout,*) 'Exiting tra_npc , kt = ',kt,', => numb. of statically instable water-columns: ', inpcc |
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| 315 | WRITE(numout,*) |
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[3] | 316 | ENDIF |
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[503] | 317 | ! |
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[4990] | 318 | ENDIF ! IF( MOD( kt, nn_npc ) == 0 ) THEN |
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[503] | 319 | ! |
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[9019] | 320 | IF( ln_timing ) CALL timing_stop('tra_npc') |
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[3294] | 321 | ! |
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[3] | 322 | END SUBROUTINE tra_npc |
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| 323 | |
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| 324 | !!====================================================================== |
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| 325 | END MODULE tranpc |
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