| 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 | ! TEMP: This change not necessary after trd_tra is tiled and extra haloes development (lbc_lnk removed) |
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| 20 | USE domain, ONLY : dom_tile |
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| 21 | USE phycst ! physical constants |
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| 22 | USE zdf_oce ! ocean vertical physics |
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| 23 | USE trd_oce ! ocean active tracer trends |
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| 24 | USE trdtra ! ocean active tracer trends |
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| 25 | USE eosbn2 ! equation of state (eos routine) |
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| 26 | ! |
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| 27 | USE lbclnk ! lateral boundary conditions (or mpp link) |
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| 28 | USE in_out_manager ! I/O manager |
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| 29 | USE lib_mpp ! MPP library |
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| 30 | USE timing ! Timing |
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| 31 | |
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| 32 | IMPLICIT NONE |
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| 33 | PRIVATE |
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| 34 | |
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| 35 | PUBLIC tra_npc ! routine called by step.F90 |
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| 36 | |
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| 37 | INTEGER :: nnpcc ! number of statically instable water column |
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| 38 | |
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| 39 | !! * Substitutions |
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| 40 | # include "do_loop_substitute.h90" |
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| 41 | # include "domzgr_substitute.h90" |
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| 42 | !!---------------------------------------------------------------------- |
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| 43 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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| 44 | !! $Id$ |
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| 45 | !! Software governed by the CeCILL license (see ./LICENSE) |
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| 46 | !!---------------------------------------------------------------------- |
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| 47 | CONTAINS |
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| 48 | |
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| 49 | SUBROUTINE tra_npc( kt, Kmm, Krhs, pts, Kaa ) |
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| 50 | !!---------------------------------------------------------------------- |
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| 51 | !! *** ROUTINE tranpc *** |
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| 52 | !! |
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| 53 | !! ** Purpose : Non-penetrative convective adjustment scheme. solve |
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| 54 | !! the static instability of the water column on after fields |
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| 55 | !! while conserving heat and salt contents. |
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| 56 | !! |
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| 57 | !! ** Method : updated algorithm able to deal with non-linear equation of state |
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| 58 | !! (i.e. static stability computed locally) |
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| 59 | !! |
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| 60 | !! ** Action : - tsa: after tracers with the application of the npc scheme |
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| 61 | !! - send the associated trends for on-line diagnostics (l_trdtra=T) |
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| 62 | !! |
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| 63 | !! References : Madec, et al., 1991, JPO, 21, 9, 1349-1371. |
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| 64 | !!---------------------------------------------------------------------- |
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| 65 | INTEGER, INTENT(in ) :: kt ! ocean time-step index |
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| 66 | INTEGER, INTENT(in ) :: Kmm, Krhs, Kaa ! time level indices |
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| 67 | REAL(wp), DIMENSION(jpi,jpj,jpk,jpts,jpt), INTENT(inout) :: pts ! active tracers and RHS of tracer equation |
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| 68 | ! |
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| 69 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 70 | INTEGER :: jiter, ikbot, ikp, ikup, ikdown, ilayer, ik_low ! local integers |
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| 71 | LOGICAL :: l_bottom_reached, l_column_treated |
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| 72 | REAL(wp) :: zta, zalfa, zsum_temp, zsum_alfa, zaw, zdz, zsum_z |
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| 73 | REAL(wp) :: zsa, zbeta, zsum_sali, zsum_beta, zbw, zrw, z1_rDt |
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| 74 | REAL(wp), PARAMETER :: zn2_zero = 1.e-14_wp ! acceptance criteria for neutrality (N2==0) |
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| 75 | REAL(wp), DIMENSION( jpk ) :: zvn2 ! vertical profile of N2 at 1 given point... |
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| 76 | REAL(wp), DIMENSION( jpk,jpts) :: zvts, zvab ! vertical profile of T & S , and alpha & betaat 1 given point |
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| 77 | REAL(wp), DIMENSION(ST_2D(nn_hls),jpk ) :: zn2 ! N^2 |
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| 78 | REAL(wp), DIMENSION(ST_2D(nn_hls),jpk,jpts) :: zab ! alpha and beta |
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| 79 | ! TEMP: This change not necessary after trd_tra is tiled |
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| 80 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: ztrdt, ztrds ! 3D workspace |
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| 81 | ! |
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| 82 | LOGICAL, PARAMETER :: l_LB_debug = .FALSE. ! set to true if you want to follow what is |
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| 83 | INTEGER :: ilc1, jlc1, klc1, nncpu ! actually happening in a water column at point "ilc1, jlc1" |
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| 84 | LOGICAL :: lp_monitor_point = .FALSE. ! in CPU domain "nncpu" |
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| 85 | !!---------------------------------------------------------------------- |
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| 86 | ! |
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| 87 | IF( ln_timing ) CALL timing_start('tra_npc') |
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| 88 | |
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| 89 | IF( l_trdtra ) THEN |
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| 90 | IF( ntile == 0 .OR. ntile == 1 ) THEN ! Do only on the first tile |
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| 91 | ! TEMP: This can be ST_2D(nn_hls) after trd_tra is tiled |
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| 92 | ALLOCATE( ztrdt(jpi,jpj,jpk), ztrds(jpi,jpj,jpk) ) |
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| 93 | ENDIF |
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| 94 | ENDIF |
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| 95 | ! |
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| 96 | IF( MOD( kt, nn_npc ) == 0 ) THEN |
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| 97 | ! |
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| 98 | IF( l_trdtra ) THEN !* Save initial after fields |
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| 99 | DO_3D( 0, 0, 0, 0, 1, jpk ) |
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| 100 | ztrdt(ji,jj,jk) = pts(ji,jj,jk,jp_tem,Kaa) |
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| 101 | ztrds(ji,jj,jk) = pts(ji,jj,jk,jp_sal,Kaa) |
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| 102 | END_3D |
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| 103 | ENDIF |
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| 104 | ! |
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| 105 | ! TODO: NOT TESTED- requires ORCA2 |
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| 106 | IF( l_LB_debug ) THEN |
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| 107 | ! Location of 1 known convection site to follow what's happening in the water column |
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| 108 | ilc1 = 45 ; jlc1 = 3 ; ! ORCA2 4x4, Antarctic coast, more than 2 unstable portions in the water column... |
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| 109 | nncpu = 1 ; ! the CPU domain contains the convection spot |
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| 110 | klc1 = mbkt(ilc1,jlc1) ! bottom of the ocean for debug point... |
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| 111 | ENDIF |
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| 112 | ! |
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| 113 | CALL eos_rab( pts(:,:,:,:,Kaa), zab, Kmm ) ! after alpha and beta (given on T-points) |
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| 114 | CALL bn2 ( pts(:,:,:,:,Kaa), zab, zn2, Kmm ) ! after Brunt-Vaisala (given on W-points) |
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| 115 | ! |
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| 116 | IF( ntile == 0 .OR. ntile == 1 ) nnpcc = 0 ! Do only on the first tile |
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| 117 | ! |
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| 118 | DO_2D( 0, 0, 0, 0 ) |
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| 119 | ! |
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| 120 | IF( tmask(ji,jj,2) == 1 ) THEN ! At least 2 ocean points |
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| 121 | ! ! consider one ocean column |
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| 122 | zvts(:,jp_tem) = pts(ji,jj,:,jp_tem,Kaa) ! temperature |
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| 123 | zvts(:,jp_sal) = pts(ji,jj,:,jp_sal,Kaa) ! salinity |
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| 124 | ! |
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| 125 | zvab(:,jp_tem) = zab(ji,jj,:,jp_tem) ! Alpha |
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| 126 | zvab(:,jp_sal) = zab(ji,jj,:,jp_sal) ! Beta |
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| 127 | zvn2(:) = zn2(ji,jj,:) ! N^2 |
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| 128 | ! |
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| 129 | IF( l_LB_debug ) THEN !LB debug: |
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| 130 | lp_monitor_point = .FALSE. |
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| 131 | IF( ( ji == ilc1 ).AND.( jj == jlc1 ) ) lp_monitor_point = .TRUE. |
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| 132 | ! writing only if on CPU domain where conv region is: |
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| 133 | lp_monitor_point = (narea == nncpu).AND.lp_monitor_point |
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| 134 | ENDIF !LB debug end |
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| 135 | ! |
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| 136 | ikbot = mbkt(ji,jj) ! ikbot: ocean bottom T-level |
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| 137 | ikp = 1 ! because N2 is irrelevant at the surface level (will start at ikp=2) |
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| 138 | ilayer = 0 |
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| 139 | jiter = 0 |
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| 140 | l_column_treated = .FALSE. |
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| 141 | ! |
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| 142 | DO WHILE ( .NOT. l_column_treated ) |
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| 143 | ! |
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| 144 | jiter = jiter + 1 |
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| 145 | ! |
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| 146 | IF( jiter >= 400 ) EXIT |
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| 147 | ! |
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| 148 | l_bottom_reached = .FALSE. |
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| 149 | ! |
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| 150 | DO WHILE ( .NOT. l_bottom_reached ) |
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| 151 | ! |
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| 152 | ikp = ikp + 1 |
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| 153 | ! |
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| 154 | !! Testing level ikp for instability |
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| 155 | !! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 156 | IF( zvn2(ikp) < -zn2_zero ) THEN ! Instability found! |
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| 157 | ! |
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| 158 | ilayer = ilayer + 1 ! yet another instable portion of the water column found.... |
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| 159 | ! |
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| 160 | IF( lp_monitor_point ) THEN |
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| 161 | WRITE(numout,*) |
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| 162 | IF( ilayer == 1 .AND. jiter == 1 ) THEN ! first time a column is spoted with an instability |
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| 163 | WRITE(numout,*) |
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| 164 | WRITE(numout,*) 'Time step = ',kt,' !!!' |
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| 165 | ENDIF |
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| 166 | WRITE(numout,*) ' * Iteration #',jiter,': found instable portion #',ilayer, & |
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| 167 | & ' in column! Starting at ikp =', ikp |
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| 168 | WRITE(numout,*) ' *** N2 for point (i,j) = ',ji,' , ',jj |
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| 169 | DO jk = 1, klc1 |
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| 170 | WRITE(numout,*) jk, zvn2(jk) |
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| 171 | END DO |
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| 172 | WRITE(numout,*) |
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| 173 | ENDIF |
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| 174 | ! |
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| 175 | IF( jiter == 1 ) nnpcc = nnpcc + 1 |
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| 176 | ! |
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| 177 | IF( lp_monitor_point ) WRITE(numout, *) 'Negative N2 at ikp =',ikp,' for layer #', ilayer |
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| 178 | ! |
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| 179 | !! ikup is the uppermost point where mixing will start: |
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| 180 | ikup = ikp - 1 ! ikup is always "at most at ikp-1", less if neutral levels overlying |
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| 181 | ! |
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| 182 | !! If the points above ikp-1 have N2 == 0 they must also be mixed: |
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| 183 | IF( ikp > 2 ) THEN |
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| 184 | DO jk = ikp-1, 2, -1 |
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| 185 | IF( ABS(zvn2(jk)) < zn2_zero ) THEN |
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| 186 | ikup = ikup - 1 ! 1 more upper level has N2=0 and must be added for the mixing |
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| 187 | ELSE |
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| 188 | EXIT |
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| 189 | ENDIF |
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| 190 | END DO |
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| 191 | ENDIF |
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| 192 | ! |
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| 193 | IF( ikup < 1 ) CALL ctl_stop( 'tra_npc : PROBLEM #1') |
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| 194 | ! |
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| 195 | zsum_temp = 0._wp |
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| 196 | zsum_sali = 0._wp |
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| 197 | zsum_alfa = 0._wp |
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| 198 | zsum_beta = 0._wp |
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| 199 | zsum_z = 0._wp |
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| 200 | |
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| 201 | DO jk = ikup, ikbot ! Inside the instable (and overlying neutral) portion of the column |
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| 202 | ! |
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| 203 | zdz = e3t(ji,jj,jk,Kmm) |
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| 204 | zsum_temp = zsum_temp + zvts(jk,jp_tem)*zdz |
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| 205 | zsum_sali = zsum_sali + zvts(jk,jp_sal)*zdz |
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| 206 | zsum_alfa = zsum_alfa + zvab(jk,jp_tem)*zdz |
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| 207 | zsum_beta = zsum_beta + zvab(jk,jp_sal)*zdz |
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| 208 | zsum_z = zsum_z + zdz |
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| 209 | ! |
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| 210 | IF( jk == ikbot ) EXIT ! avoid array-index overshoot in case ikbot = jpk, cause we're calling jk+1 next line |
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| 211 | !! EXIT when we have reached the last layer that is instable (N2<0) or neutral (N2=0): |
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| 212 | IF( zvn2(jk+1) > zn2_zero ) EXIT |
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| 213 | END DO |
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| 214 | |
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| 215 | ikdown = jk ! for the current unstable layer, ikdown is the deepest point with a negative or neutral N2 |
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| 216 | IF( ikup == ikdown ) CALL ctl_stop( 'tra_npc : PROBLEM #2') |
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| 217 | |
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| 218 | ! Mixing Temperature, salinity, alpha and beta from ikup to ikdown included: |
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| 219 | zta = zsum_temp/zsum_z |
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| 220 | zsa = zsum_sali/zsum_z |
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| 221 | zalfa = zsum_alfa/zsum_z |
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| 222 | zbeta = zsum_beta/zsum_z |
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| 223 | |
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| 224 | IF( lp_monitor_point ) THEN |
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| 225 | WRITE(numout,*) 'MIXED T, S, alfa and beta between ikup =',ikup, & |
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| 226 | & ' and ikdown =',ikdown,', in layer #',ilayer |
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| 227 | WRITE(numout,*) ' => Mean temp. in that portion =', zta |
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| 228 | WRITE(numout,*) ' => Mean sali. in that portion =', zsa |
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| 229 | WRITE(numout,*) ' => Mean Alfa in that portion =', zalfa |
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| 230 | WRITE(numout,*) ' => Mean Beta in that portion =', zbeta |
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| 231 | ENDIF |
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| 232 | |
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| 233 | !! Homogenaizing the temperature, salinity, alpha and beta in this portion of the column |
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| 234 | DO jk = ikup, ikdown |
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| 235 | zvts(jk,jp_tem) = zta |
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| 236 | zvts(jk,jp_sal) = zsa |
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| 237 | zvab(jk,jp_tem) = zalfa |
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| 238 | zvab(jk,jp_sal) = zbeta |
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| 239 | END DO |
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| 240 | |
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| 241 | |
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| 242 | !! Updating N2 in the relvant portion of the water column |
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| 243 | !! Temperature, Salinity, Alpha and Beta have been homogenized in the unstable portion |
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| 244 | !! => Need to re-compute N2! will use Alpha and Beta! |
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| 245 | |
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| 246 | ikup = MAX(2,ikup) ! ikup can never be 1 ! |
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| 247 | ik_low = MIN(ikdown+1,ikbot) ! we must go 1 point deeper than ikdown! |
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| 248 | |
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| 249 | DO jk = ikup, ik_low ! we must go 1 point deeper than ikdown! |
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| 250 | |
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| 251 | !! Interpolating alfa and beta at W point: |
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| 252 | zrw = (gdepw(ji,jj,jk ,Kmm) - gdept(ji,jj,jk,Kmm)) & |
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| 253 | & / (gdept(ji,jj,jk-1,Kmm) - gdept(ji,jj,jk,Kmm)) |
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| 254 | zaw = zvab(jk,jp_tem) * (1._wp - zrw) + zvab(jk-1,jp_tem) * zrw |
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| 255 | zbw = zvab(jk,jp_sal) * (1._wp - zrw) + zvab(jk-1,jp_sal) * zrw |
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| 256 | |
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| 257 | !! N2 at W point, doing exactly as in eosbn2.F90: |
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| 258 | zvn2(jk) = grav*( zaw * ( zvts(jk-1,jp_tem) - zvts(jk,jp_tem) ) & |
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| 259 | & - zbw * ( zvts(jk-1,jp_sal) - zvts(jk,jp_sal) ) ) & |
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| 260 | & / e3w(ji,jj,jk,Kmm) * tmask(ji,jj,jk) |
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| 261 | |
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| 262 | !! OR, faster => just considering the vertical gradient of density |
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| 263 | !! as only the signa maters... |
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| 264 | !zvn2(jk) = ( zaw * ( zvts(jk-1,jp_tem) - zvts(jk,jp_tem) ) & |
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| 265 | ! & - zbw * ( zvts(jk-1,jp_sal) - zvts(jk,jp_sal) ) ) |
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| 266 | |
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| 267 | END DO |
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| 268 | |
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| 269 | ikp = MIN(ikdown+1,ikbot) |
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| 270 | |
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| 271 | |
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| 272 | ENDIF !IF( zvn2(ikp) < 0. ) |
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| 273 | |
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| 274 | |
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| 275 | IF( ikp == ikbot ) l_bottom_reached = .TRUE. |
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| 276 | ! |
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| 277 | END DO ! DO WHILE ( .NOT. l_bottom_reached ) |
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| 278 | |
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| 279 | IF( ikp /= ikbot ) CALL ctl_stop( 'tra_npc : PROBLEM #3') |
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| 280 | |
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| 281 | ! ******* At this stage ikp == ikbot ! ******* |
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| 282 | |
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| 283 | IF( ilayer > 0 ) THEN !! least an unstable layer has been found |
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| 284 | ! |
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| 285 | IF( lp_monitor_point ) THEN |
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| 286 | WRITE(numout,*) |
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| 287 | WRITE(numout,*) 'After ',jiter,' iteration(s), we neutralized ',ilayer,' instable layer(s)' |
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| 288 | WRITE(numout,*) ' ==> N2 at i,j=',ji,',',jj,' now looks like this:' |
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| 289 | DO jk = 1, klc1 |
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| 290 | WRITE(numout,*) jk, zvn2(jk) |
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| 291 | END DO |
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| 292 | WRITE(numout,*) |
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| 293 | ENDIF |
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| 294 | ! |
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| 295 | ikp = 1 ! starting again at the surface for the next iteration |
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| 296 | ilayer = 0 |
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| 297 | ENDIF |
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| 298 | ! |
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| 299 | IF( ikp >= ikbot ) l_column_treated = .TRUE. |
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| 300 | ! |
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| 301 | END DO ! DO WHILE ( .NOT. l_column_treated ) |
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| 302 | |
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| 303 | !! Updating pts: |
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| 304 | pts(ji,jj,:,jp_tem,Kaa) = zvts(:,jp_tem) |
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| 305 | pts(ji,jj,:,jp_sal,Kaa) = zvts(:,jp_sal) |
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| 306 | |
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| 307 | !! LB: Potentially some other global variable beside theta and S can be treated here |
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| 308 | !! like BGC tracers. |
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| 309 | |
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| 310 | IF( lp_monitor_point ) WRITE(numout,*) |
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| 311 | |
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| 312 | ENDIF ! IF( tmask(ji,jj,3) == 1 ) THEN |
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| 313 | |
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| 314 | END_2D |
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| 315 | ! |
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| 316 | ! TEMP: These changes not necessary after trd_tra is tiled and extra haloes development (lbc_lnk removed) |
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| 317 | IF( l_trdtra ) THEN |
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| 318 | z1_rDt = 1._wp / (2._wp * rn_Dt) |
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| 319 | |
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| 320 | DO_3D( 0, 0, 0, 0, 1, jpk ) |
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| 321 | ztrdt(ji,jj,jk) = ( pts(ji,jj,jk,jp_tem,Kaa) - ztrdt(ji,jj,jk) ) * z1_rDt |
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| 322 | ztrds(ji,jj,jk) = ( pts(ji,jj,jk,jp_sal,Kaa) - ztrds(ji,jj,jk) ) * z1_rDt |
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| 323 | END_3D |
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| 324 | ENDIF |
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| 325 | |
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| 326 | IF( ntile == 0 .OR. ntile == nijtile ) THEN ! Do only for the full domain |
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| 327 | IF( ln_tile ) CALL dom_tile( ntsi, ntsj, ntei, ntej, ktile = 0 ) ! Use full domain |
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| 328 | |
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| 329 | IF( l_trdtra ) THEN ! send the Non penetrative mixing trends for diagnostic |
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| 330 | ! TODO: TO BE TILED- trd_tra |
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| 331 | CALL trd_tra( kt, Kmm, Krhs, 'TRA', jp_tem, jptra_npc, ztrdt ) |
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| 332 | CALL trd_tra( kt, Kmm, Krhs, 'TRA', jp_sal, jptra_npc, ztrds ) |
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| 333 | DEALLOCATE( ztrdt, ztrds ) |
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| 334 | ENDIF |
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| 335 | |
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| 336 | IF( ln_tile ) CALL dom_tile( ntsi, ntsj, ntei, ntej, ktile = nijtile ) ! Revert to tile domain |
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| 337 | ! |
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| 338 | CALL lbc_lnk_multi( 'tranpc', pts(:,:,:,jp_tem,Kaa), 'T', 1.0_wp, pts(:,:,:,jp_sal,Kaa), 'T', 1.0_wp ) |
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| 339 | ! |
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| 340 | IF( lwp .AND. l_LB_debug ) THEN |
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| 341 | WRITE(numout,*) 'Exiting tra_npc , kt = ',kt,', => numb. of statically instable water-columns: ', nnpcc |
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| 342 | WRITE(numout,*) |
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| 343 | ENDIF |
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| 344 | ENDIF |
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| 345 | ! |
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| 346 | ENDIF ! IF( MOD( kt, nn_npc ) == 0 ) THEN |
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| 347 | ! |
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| 348 | IF( ln_timing ) CALL timing_stop('tra_npc') |
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| 349 | ! |
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| 350 | END SUBROUTINE tra_npc |
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| 351 | |
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| 352 | !!====================================================================== |
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| 353 | END MODULE tranpc |
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