| 1 | MODULE tranpc |
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| 2 | !!============================================================================== |
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| 3 | !! *** MODULE tranpc *** |
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| 4 | !! Ocean active tracers: non penetrative convective adjustment scheme |
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| 5 | !!============================================================================== |
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| 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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| 10 | !! 3.3 ! 2010-05 (C. Ethe, G. Madec) merge TRC-TRA |
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| 11 | !! 3.6 ! 2015-05 (L. Brodeau) new algorithm based on local Brunt-Vaisala freq. |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | |
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| 14 | !!---------------------------------------------------------------------- |
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| 15 | !! tra_npc : apply the non penetrative convection scheme |
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| 16 | !!---------------------------------------------------------------------- |
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| 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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| 24 | ! |
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| 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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| 29 | |
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| 30 | IMPLICIT NONE |
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| 31 | PRIVATE |
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| 32 | |
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| 33 | PUBLIC tra_npc ! routine called by step.F90 |
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| 34 | |
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| 35 | !! * Substitutions |
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| 36 | # include "vectopt_loop_substitute.h90" |
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| 37 | !!---------------------------------------------------------------------- |
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| 38 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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| 39 | !! $Id$ |
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| 40 | !! Software governed by the CeCILL licence (./LICENSE) |
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| 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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| 48 | !! ** Purpose : Non-penetrative convective adjustment scheme. solve |
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| 49 | !! the static instability of the water column on after fields |
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| 50 | !! while conserving heat and salt contents. |
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| 51 | !! |
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| 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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| 54 | !! |
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| 55 | !! ** Action : - tsa: after tracers with the application of the npc scheme |
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| 56 | !! - send the associated trends for on-line diagnostics (l_trdtra=T) |
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| 57 | !! |
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| 58 | !! References : Madec, et al., 1991, JPO, 21, 9, 1349-1371. |
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| 59 | !!---------------------------------------------------------------------- |
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| 60 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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| 61 | ! |
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| 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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| 64 | INTEGER :: jiter, ikbot, ikp, ikup, ikdown, ilayer, ik_low ! local integers |
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| 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 |
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| 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(:,:,:,:) :: ztrd ! 4D workspace |
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| 74 | ! |
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| 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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| 78 | !!---------------------------------------------------------------------- |
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| 79 | ! |
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| 80 | IF( ln_timing ) CALL timing_start('tra_npc') |
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| 81 | ! |
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| 82 | IF( MOD( kt, nn_npc ) == 0 ) THEN |
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| 83 | ! |
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| 84 | IF( l_trdtra ) THEN !* Save input after fields |
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| 85 | ALLOCATE( ztrd(jpi,jpj,jpk,jpts) ) |
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| 86 | ztrd(:,:,:,:) = tsa(:,:,:,:) |
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| 87 | ENDIF |
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| 88 | ! |
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| 89 | IF( l_LB_debug ) THEN |
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| 90 | ! Location of 1 known convection site to follow what's happening in the water column |
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| 91 | ilc1 = 45 ; jlc1 = 3 ; ! ORCA2 4x4, Antarctic coast, more than 2 unstable portions in the water column... |
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| 92 | nncpu = 1 ; ! the CPU domain contains the convection spot |
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| 93 | klc1 = mbkt(ilc1,jlc1) ! bottom of the ocean for debug point... |
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| 94 | ENDIF |
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| 95 | ! |
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| 96 | CALL eos_rab( tsa, zab ) ! after alpha and beta (given on T-points) |
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| 97 | CALL bn2 ( tsa, zab, zn2 ) ! after Brunt-Vaisala (given on W-points) |
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| 98 | ! |
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| 99 | inpcc = 0 |
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| 100 | ! |
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| 101 | DO jj = 2, jpjm1 ! interior column only |
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| 102 | DO ji = fs_2, fs_jpim1 |
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| 103 | ! |
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| 104 | IF( tmask(ji,jj,2) == 1 ) THEN ! At least 2 ocean points |
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| 105 | ! ! consider one ocean column |
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| 106 | zvts(:,jp_tem) = tsa(ji,jj,:,jp_tem) ! temperature |
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| 107 | zvts(:,jp_sal) = tsa(ji,jj,:,jp_sal) ! salinity |
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| 108 | ! |
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| 109 | zvab(:,jp_tem) = zab(ji,jj,:,jp_tem) ! Alpha |
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| 110 | zvab(:,jp_sal) = zab(ji,jj,:,jp_sal) ! Beta |
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| 111 | zvn2(:) = zn2(ji,jj,:) ! N^2 |
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| 112 | ! |
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| 113 | IF( l_LB_debug ) THEN !LB debug: |
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| 114 | lp_monitor_point = .FALSE. |
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| 115 | IF( ( ji == ilc1 ).AND.( jj == jlc1 ) ) lp_monitor_point = .TRUE. |
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| 116 | ! writing only if on CPU domain where conv region is: |
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| 117 | lp_monitor_point = (narea == nncpu).AND.lp_monitor_point |
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| 118 | ENDIF !LB debug end |
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| 119 | ! |
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| 120 | ikbot = mbkt(ji,jj) ! ikbot: ocean bottom T-level |
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| 121 | ikp = 1 ! because N2 is irrelevant at the surface level (will start at ikp=2) |
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| 122 | ilayer = 0 |
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| 123 | jiter = 0 |
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| 124 | l_column_treated = .FALSE. |
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| 125 | ! |
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| 126 | DO WHILE ( .NOT. l_column_treated ) |
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| 127 | ! |
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| 128 | jiter = jiter + 1 |
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| 129 | ! |
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| 130 | IF( jiter >= 400 ) EXIT |
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| 131 | ! |
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| 132 | l_bottom_reached = .FALSE. |
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| 133 | ! |
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| 134 | DO WHILE ( .NOT. l_bottom_reached ) |
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| 135 | ! |
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| 136 | ikp = ikp + 1 |
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| 137 | ! |
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| 138 | !! Testing level ikp for instability |
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| 139 | !! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 140 | IF( zvn2(ikp) < -zn2_zero ) THEN ! Instability found! |
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| 141 | ! |
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| 142 | ilayer = ilayer + 1 ! yet another instable portion of the water column found.... |
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| 143 | ! |
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| 144 | IF( lp_monitor_point ) THEN |
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| 145 | WRITE(numout,*) |
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| 146 | IF( ilayer == 1 .AND. jiter == 1 ) THEN ! first time a column is spoted with an instability |
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| 147 | WRITE(numout,*) |
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| 148 | WRITE(numout,*) 'Time step = ',kt,' !!!' |
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| 149 | ENDIF |
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| 150 | WRITE(numout,*) ' * Iteration #',jiter,': found instable portion #',ilayer, & |
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| 151 | & ' in column! Starting at ikp =', ikp |
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| 152 | WRITE(numout,*) ' *** N2 for point (i,j) = ',ji,' , ',jj |
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| 153 | DO jk = 1, klc1 |
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| 154 | WRITE(numout,*) jk, zvn2(jk) |
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| 155 | END DO |
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| 156 | WRITE(numout,*) |
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| 157 | ENDIF |
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| 158 | ! |
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| 159 | IF( jiter == 1 ) inpcc = inpcc + 1 |
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| 160 | ! |
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| 161 | IF( lp_monitor_point ) WRITE(numout, *) 'Negative N2 at ikp =',ikp,' for layer #', ilayer |
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| 162 | ! |
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| 163 | !! ikup is the uppermost point where mixing will start: |
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| 164 | ikup = ikp - 1 ! ikup is always "at most at ikp-1", less if neutral levels overlying |
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| 165 | ! |
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| 166 | !! If the points above ikp-1 have N2 == 0 they must also be mixed: |
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| 167 | IF( ikp > 2 ) THEN |
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| 168 | DO jk = ikp-1, 2, -1 |
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| 169 | IF( ABS(zvn2(jk)) < zn2_zero ) THEN |
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| 170 | ikup = ikup - 1 ! 1 more upper level has N2=0 and must be added for the mixing |
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| 171 | ELSE |
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| 172 | EXIT |
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| 173 | ENDIF |
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| 174 | END DO |
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| 175 | ENDIF |
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| 176 | ! |
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| 177 | IF( ikup < 1 ) CALL ctl_stop( 'tra_npc : PROBLEM #1') |
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| 178 | ! |
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| 179 | zsum_temp = 0._wp |
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| 180 | zsum_sali = 0._wp |
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| 181 | zsum_alfa = 0._wp |
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| 182 | zsum_beta = 0._wp |
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| 183 | zsum_z = 0._wp |
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| 184 | |
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| 185 | DO jk = ikup, ikbot ! Inside the instable (and overlying neutral) portion of the column |
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| 186 | ! |
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| 187 | zdz = e3t_n(ji,jj,jk) |
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| 188 | zsum_temp = zsum_temp + zvts(jk,jp_tem)*zdz |
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| 189 | zsum_sali = zsum_sali + zvts(jk,jp_sal)*zdz |
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| 190 | zsum_alfa = zsum_alfa + zvab(jk,jp_tem)*zdz |
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| 191 | zsum_beta = zsum_beta + zvab(jk,jp_sal)*zdz |
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| 192 | zsum_z = zsum_z + zdz |
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| 193 | ! |
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| 194 | IF( jk == ikbot ) EXIT ! avoid array-index overshoot in case ikbot = jpk, cause we're calling jk+1 next line |
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| 195 | !! EXIT when we have reached the last layer that is instable (N2<0) or neutral (N2=0): |
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| 196 | IF( zvn2(jk+1) > zn2_zero ) EXIT |
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| 197 | END DO |
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| 198 | |
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| 199 | ikdown = jk ! for the current unstable layer, ikdown is the deepest point with a negative or neutral N2 |
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| 200 | IF( ikup == ikdown ) CALL ctl_stop( 'tra_npc : PROBLEM #2') |
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| 201 | |
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| 202 | ! Mixing Temperature, salinity, alpha and beta from ikup to ikdown included: |
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| 203 | zta = zsum_temp/zsum_z |
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| 204 | zsa = zsum_sali/zsum_z |
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| 205 | zalfa = zsum_alfa/zsum_z |
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| 206 | zbeta = zsum_beta/zsum_z |
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| 207 | |
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| 208 | IF( lp_monitor_point ) THEN |
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| 209 | WRITE(numout,*) 'MIXED T, S, alfa and beta between ikup =',ikup, & |
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| 210 | & ' and ikdown =',ikdown,', in layer #',ilayer |
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| 211 | WRITE(numout,*) ' => Mean temp. in that portion =', zta |
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| 212 | WRITE(numout,*) ' => Mean sali. in that portion =', zsa |
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| 213 | WRITE(numout,*) ' => Mean Alfa in that portion =', zalfa |
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| 214 | WRITE(numout,*) ' => Mean Beta in that portion =', zbeta |
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| 215 | ENDIF |
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| 216 | |
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| 217 | !! Homogenaizing the temperature, salinity, alpha and beta in this portion of the column |
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| 218 | DO jk = ikup, ikdown |
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| 219 | zvts(jk,jp_tem) = zta |
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| 220 | zvts(jk,jp_sal) = zsa |
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| 221 | zvab(jk,jp_tem) = zalfa |
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| 222 | zvab(jk,jp_sal) = zbeta |
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| 223 | END DO |
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| 224 | |
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| 225 | |
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| 226 | !! Updating N2 in the relvant portion of the water column |
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| 227 | !! Temperature, Salinity, Alpha and Beta have been homogenized in the unstable portion |
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| 228 | !! => Need to re-compute N2! will use Alpha and Beta! |
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| 229 | |
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| 230 | ikup = MAX(2,ikup) ! ikup can never be 1 ! |
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| 231 | ik_low = MIN(ikdown+1,ikbot) ! we must go 1 point deeper than ikdown! |
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| 232 | |
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| 233 | DO jk = ikup, ik_low ! we must go 1 point deeper than ikdown! |
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| 234 | |
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| 235 | !! Interpolating alfa and beta at W point: |
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| 236 | zrw = (gdepw_n(ji,jj,jk ) - gdept_n(ji,jj,jk)) & |
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| 237 | & / (gdept_n(ji,jj,jk-1) - gdept_n(ji,jj,jk)) |
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| 238 | zaw = zvab(jk,jp_tem) * (1._wp - zrw) + zvab(jk-1,jp_tem) * zrw |
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| 239 | zbw = zvab(jk,jp_sal) * (1._wp - zrw) + zvab(jk-1,jp_sal) * zrw |
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| 240 | |
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| 241 | !! N2 at W point, doing exactly as in eosbn2.F90: |
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| 242 | zvn2(jk) = grav*( zaw * ( zvts(jk-1,jp_tem) - zvts(jk,jp_tem) ) & |
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| 243 | & - zbw * ( zvts(jk-1,jp_sal) - zvts(jk,jp_sal) ) ) & |
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| 244 | & / e3w_n(ji,jj,jk) * tmask(ji,jj,jk) |
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| 245 | |
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| 246 | !! OR, faster => just considering the vertical gradient of density |
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| 247 | !! as only the signa maters... |
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| 248 | !zvn2(jk) = ( zaw * ( zvts(jk-1,jp_tem) - zvts(jk,jp_tem) ) & |
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| 249 | ! & - zbw * ( zvts(jk-1,jp_sal) - zvts(jk,jp_sal) ) ) |
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| 250 | |
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| 251 | END DO |
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| 252 | |
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| 253 | ikp = MIN(ikdown+1,ikbot) |
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| 254 | |
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| 255 | |
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| 256 | ENDIF !IF( zvn2(ikp) < 0. ) |
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| 257 | |
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| 258 | |
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| 259 | IF( ikp == ikbot ) l_bottom_reached = .TRUE. |
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| 260 | ! |
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| 261 | END DO ! DO WHILE ( .NOT. l_bottom_reached ) |
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| 262 | |
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| 263 | IF( ikp /= ikbot ) CALL ctl_stop( 'tra_npc : PROBLEM #3') |
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| 264 | |
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| 265 | ! ******* At this stage ikp == ikbot ! ******* |
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| 266 | |
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| 267 | IF( ilayer > 0 ) THEN !! least an unstable layer has been found |
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| 268 | ! |
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| 269 | IF( lp_monitor_point ) THEN |
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| 270 | WRITE(numout,*) |
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| 271 | WRITE(numout,*) 'After ',jiter,' iteration(s), we neutralized ',ilayer,' instable layer(s)' |
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| 272 | WRITE(numout,*) ' ==> N2 at i,j=',ji,',',jj,' now looks like this:' |
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| 273 | DO jk = 1, klc1 |
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| 274 | WRITE(numout,*) jk, zvn2(jk) |
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| 275 | END DO |
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| 276 | WRITE(numout,*) |
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| 277 | ENDIF |
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| 278 | ! |
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| 279 | ikp = 1 ! starting again at the surface for the next iteration |
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| 280 | ilayer = 0 |
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| 281 | ENDIF |
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| 282 | ! |
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| 283 | IF( ikp >= ikbot ) l_column_treated = .TRUE. |
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| 284 | ! |
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| 285 | END DO ! DO WHILE ( .NOT. l_column_treated ) |
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| 286 | |
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| 287 | !! Updating tsa: |
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| 288 | tsa(ji,jj,:,jp_tem) = zvts(:,jp_tem) |
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| 289 | tsa(ji,jj,:,jp_sal) = zvts(:,jp_sal) |
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| 290 | |
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| 291 | !! LB: Potentially some other global variable beside theta and S can be treated here |
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| 292 | !! like BGC tracers. |
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| 293 | |
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| 294 | IF( lp_monitor_point ) WRITE(numout,*) |
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| 295 | |
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| 296 | ENDIF ! IF( tmask(ji,jj,3) == 1 ) THEN |
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| 297 | |
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| 298 | END DO ! ji |
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| 299 | END DO ! jj |
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| 300 | ! |
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| 301 | IF( l_trdtra ) THEN ! send the Non penetrative mixing trends for diagnostic |
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| 302 | ztrd(:,:,:,:) = ( tsa(:,:,:,:) - ztrd(:,:,:,:) ) * r1_Dt |
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| 303 | CALL trd_tra( kt, 'TRA', jp_tem, jptra_npc, ztrd(:,:,:,jp_tem) ) |
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| 304 | CALL trd_tra( kt, 'TRA', jp_sal, jptra_npc, ztrd(:,:,:,jp_sal) ) |
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| 305 | DEALLOCATE( ztrd ) |
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| 306 | ENDIF |
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| 307 | ! |
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| 308 | CALL lbc_lnk_multi( tsa(:,:,:,jp_tem), 'T', 1., tsa(:,:,:,jp_sal), 'T', 1. ) |
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| 309 | ! |
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| 310 | IF( lwp .AND. l_LB_debug ) THEN |
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| 311 | WRITE(numout,*) 'Exiting tra_npc , kt = ',kt,', => numb. of statically instable water-columns: ', inpcc |
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| 312 | WRITE(numout,*) |
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| 313 | ENDIF |
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| 314 | ! |
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| 315 | ENDIF ! IF( MOD( kt, nn_npc ) == 0 ) THEN |
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| 316 | ! |
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| 317 | IF( ln_timing ) CALL timing_stop('tra_npc') |
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| 318 | ! |
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| 319 | END SUBROUTINE tra_npc |
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| 320 | |
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| 321 | !!====================================================================== |
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| 322 | END MODULE tranpc |
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