| 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 convection 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 | !!---------------------------------------------------------------------- |
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| 12 | |
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| 13 | !!---------------------------------------------------------------------- |
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| 14 | !! tra_npc : apply the non penetrative convection scheme |
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| 15 | !!---------------------------------------------------------------------- |
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| 16 | USE oce ! ocean dynamics and active tracers |
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| 17 | USE dom_oce ! ocean space and time domain |
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| 18 | USE zdf_oce ! ocean vertical physics |
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| 19 | USE trdmod_oce ! ocean active tracer trends |
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| 20 | USE trdtra ! ocean active tracer trends |
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| 21 | USE eosbn2 ! equation of state (eos routine) |
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| 22 | USE lbclnk ! lateral boundary conditions (or mpp link) |
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| 23 | USE in_out_manager ! I/O manager |
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| 24 | |
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| 25 | IMPLICIT NONE |
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| 26 | PRIVATE |
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| 27 | |
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| 28 | PUBLIC tra_npc ! routine called by step.F90 |
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| 29 | |
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| 30 | !! * Substitutions |
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| 31 | # include "domzgr_substitute.h90" |
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| 32 | !!---------------------------------------------------------------------- |
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| 33 | !! NEMO/OPA 3.2 , LOCEAN-IPSL (2009) |
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| 34 | !! $Id$ |
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| 35 | !! Software governed by the CeCILL licence (NEMOGCM/License_CeCILL.txt) |
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| 36 | !!---------------------------------------------------------------------- |
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| 37 | |
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| 38 | CONTAINS |
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| 39 | |
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| 40 | SUBROUTINE tra_npc( kt ) |
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| 41 | !!---------------------------------------------------------------------- |
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| 42 | !! *** ROUTINE tranpc *** |
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| 43 | !! |
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| 44 | !! ** Purpose : Non penetrative convective adjustment scheme. solve |
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| 45 | !! the static instability of the water column on after fields |
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| 46 | !! while conserving heat and salt contents. |
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| 47 | !! |
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| 48 | !! ** Method : The algorithm used converges in a maximium of jpk |
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| 49 | !! iterations. instabilities are treated when the vertical density |
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| 50 | !! gradient is less than 1.e-5. |
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| 51 | !! l_trdtra=T: the trend associated with this algorithm is saved. |
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| 52 | !! |
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| 53 | !! ** Action : - (ta,sa) after the application od the npc scheme |
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| 54 | !! - save the associated trends (ttrd,strd) ('key_trdtra') |
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| 55 | !! |
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| 56 | !! References : Madec, et al., 1991, JPO, 21, 9, 1349-1371. |
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| 57 | !!---------------------------------------------------------------------- |
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| 58 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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| 59 | !! |
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| 60 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 61 | INTEGER :: inpcc ! number of statically instable water column |
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| 62 | INTEGER :: inpci ! number of iteration for npc scheme |
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| 63 | INTEGER :: jiter, jkdown, jkp ! ??? |
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| 64 | INTEGER :: ikbot, ik, ikup, ikdown ! ??? |
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| 65 | REAL(wp) :: ze3tot, zta, zsa, zraua, ze3dwn |
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| 66 | REAL(wp), DIMENSION(jpi,jpk) :: zwx, zwy, zwz ! 2D arrays |
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| 67 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: zrhop ! 3D arrays |
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| 68 | REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: ztrdt, ztrds |
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| 69 | !!---------------------------------------------------------------------- |
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| 70 | |
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| 71 | IF( MOD( kt, nn_npc ) == 0 ) THEN |
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| 72 | |
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| 73 | inpcc = 0 |
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| 74 | inpci = 0 |
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| 75 | |
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| 76 | CALL eos( tsa, rhd, zrhop ) ! Potential density |
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| 77 | |
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| 78 | IF( l_trdtra ) THEN !* Save ta and sa trends |
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| 79 | ALLOCATE( ztrdt(jpi,jpj,jpk) ) ; ztrdt(:,:,:) = tsa(:,:,:,jp_tem) |
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| 80 | ALLOCATE( ztrds(jpi,jpj,jpk) ) ; ztrds(:,:,:) = tsa(:,:,:,jp_sal) |
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| 81 | ENDIF |
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| 82 | |
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| 83 | ! ! =============== |
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| 84 | DO jj = 1, jpj ! Vertical slab |
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| 85 | ! ! =============== |
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| 86 | ! Static instability pointer |
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| 87 | ! ---------------------------- |
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| 88 | DO jk = 1, jpkm1 |
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| 89 | DO ji = 1, jpi |
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| 90 | zwx(ji,jk) = ( zrhop(ji,jj,jk) - zrhop(ji,jj,jk+1) ) * tmask(ji,jj,jk+1) |
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| 91 | END DO |
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| 92 | END DO |
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| 93 | |
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| 94 | ! 1.1 do not consider the boundary points |
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| 95 | |
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| 96 | ! even if east-west cyclic b. c. do not considere ji=1 or jpi |
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| 97 | DO jk = 1, jpkm1 |
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| 98 | zwx( 1 ,jk) = 0.e0 |
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| 99 | zwx(jpi,jk) = 0.e0 |
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| 100 | END DO |
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| 101 | ! even if south-symmetric b. c. used, do not considere jj=1 |
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| 102 | IF( jj == 1 ) zwx(:,:) = 0.e0 |
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| 103 | |
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| 104 | DO jk = 1, jpkm1 |
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| 105 | DO ji = 1, jpi |
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| 106 | zwx(ji,jk) = 1. |
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| 107 | IF( zwx(ji,jk) < 1.e-5 ) zwx(ji,jk) = 0.e0 |
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| 108 | END DO |
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| 109 | END DO |
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| 110 | |
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| 111 | zwy(:,1) = 0.e0 |
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| 112 | DO ji = 1, jpi |
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| 113 | DO jk = 1, jpkm1 |
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| 114 | zwy(ji,1) = zwy(ji,1) + zwx(ji,jk) |
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| 115 | END DO |
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| 116 | END DO |
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| 117 | |
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| 118 | zwz(1,1) = 0.e0 |
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| 119 | DO ji = 1, jpi |
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| 120 | zwz(1,1) = zwz(1,1) + zwy(ji,1) |
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| 121 | END DO |
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| 122 | |
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| 123 | inpcc = inpcc + NINT( zwz(1,1) ) |
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| 124 | |
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| 125 | |
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| 126 | ! 2. Vertical mixing for each instable portion of the density profil |
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| 127 | ! ------------------------------------------------------------------ |
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| 128 | |
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| 129 | IF( zwz(1,1) /= 0.e0 ) THEN ! -->> the density profil is statically instable : |
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| 130 | DO ji = 1, jpi |
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| 131 | IF( zwy(ji,1) /= 0.e0 ) THEN |
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| 132 | ! |
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| 133 | ikbot = mbathy(ji,jj) ! ikbot: ocean bottom level |
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| 134 | ! |
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| 135 | DO jiter = 1, jpk ! vertical iteration |
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| 136 | ! |
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| 137 | ! search of ikup : the first static instability from the sea surface |
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| 138 | ! |
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| 139 | ik = 0 |
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| 140 | 220 CONTINUE |
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| 141 | ik = ik + 1 |
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| 142 | IF( ik >= ikbot-1 ) GO TO 200 |
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| 143 | zwx(ji,ik) = zrhop(ji,jj,ik) - zrhop(ji,jj,ik+1) |
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| 144 | IF( zwx(ji,ik) <= 0.e0 ) GO TO 220 |
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| 145 | ikup = ik |
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| 146 | ! the density profil is instable below ikup |
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| 147 | ! ikdown : bottom of the instable portion of the density profil |
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| 148 | ! search of ikdown and vertical mixing from ikup to ikdown |
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| 149 | ! |
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| 150 | ze3tot= fse3t(ji,jj,ikup) |
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| 151 | zta = tsa (ji,jj,ikup,jp_tem) |
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| 152 | zsa = tsa (ji,jj,ikup,jp_sal) |
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| 153 | zraua = zrhop(ji,jj,ikup) |
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| 154 | ! |
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| 155 | DO jkdown = ikup+1, ikbot-1 |
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| 156 | IF( zraua <= zrhop(ji,jj,jkdown) ) THEN |
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| 157 | ikdown = jkdown |
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| 158 | GO TO 240 |
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| 159 | ENDIF |
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| 160 | ze3dwn = fse3t(ji,jj,jkdown) |
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| 161 | ze3tot = ze3tot + ze3dwn |
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| 162 | zta = ( zta*(ze3tot-ze3dwn) + tsa(ji,jj,jkdown,jp_tem)*ze3dwn )/ze3tot |
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| 163 | zsa = ( zsa*(ze3tot-ze3dwn) + tsa(ji,jj,jkdown,jp_sal)*ze3dwn )/ze3tot |
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| 164 | zraua = ( zraua*(ze3tot-ze3dwn) + zrhop(ji,jj,jkdown)*ze3dwn )/ze3tot |
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| 165 | inpci = inpci+1 |
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| 166 | END DO |
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| 167 | ikdown = ikbot-1 |
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| 168 | 240 CONTINUE |
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| 169 | ! |
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| 170 | DO jkp = ikup, ikdown-1 |
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| 171 | tsa (ji,jj,jkp,jp_tem) = zta |
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| 172 | tsa (ji,jj,jkp,jp_sal) = zsa |
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| 173 | zrhop(ji,jj,jkp ) = zraua |
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| 174 | END DO |
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| 175 | IF (ikdown == ikbot-1 .AND. zraua >= zrhop(ji,jj,ikdown) ) THEN |
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| 176 | tsa (ji,jj,jkp,jp_tem) = zta |
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| 177 | tsa (ji,jj,jkp,jp_sal) = zsa |
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| 178 | zrhop(ji,jj,ikdown ) = zraua |
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| 179 | ENDIF |
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| 180 | END DO |
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| 181 | ENDIF |
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| 182 | 200 CONTINUE |
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| 183 | END DO |
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| 184 | ! <<-- no more static instability on slab jj |
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| 185 | ENDIF |
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| 186 | ! ! =============== |
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| 187 | END DO ! End of slab |
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| 188 | ! ! =============== |
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| 189 | ! |
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| 190 | IF( l_trdtra ) THEN ! save the Non penetrative mixing trends for diagnostic |
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| 191 | ztrdt(:,:,:) = tsa(:,:,:,jp_tem) - ztrdt(:,:,:) |
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| 192 | ztrds(:,:,:) = tsa(:,:,:,jp_sal) - ztrds(:,:,:) |
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| 193 | CALL trd_tra( kt, 'TRA', jp_tem, jptra_trd_npc, ztrdt ) |
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| 194 | CALL trd_tra( kt, 'TRA', jp_sal, jptra_trd_npc, ztrds ) |
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| 195 | DEALLOCATE( ztrdt ) ; DEALLOCATE( ztrds ) |
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| 196 | ENDIF |
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| 197 | |
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| 198 | ! Lateral boundary conditions on ( ta, sa ) ( Unchanged sign) |
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| 199 | ! ------------------------------============ |
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| 200 | CALL lbc_lnk( tsa(:,:,:,jp_tem), 'T', 1. ) |
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| 201 | CALL lbc_lnk( tsa(:,:,:,jp_sal), 'T', 1. ) |
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| 202 | |
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| 203 | |
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| 204 | ! 2. non penetrative convective scheme statistics |
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| 205 | ! ----------------------------------------------- |
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| 206 | IF( nn_npcp /= 0 .AND. MOD( kt, nn_npcp ) == 0 ) THEN |
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| 207 | IF(lwp) WRITE(numout,*)' kt=',kt, ' number of statically instable', & |
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| 208 | & ' water column : ',inpcc, ' number of iteration : ',inpci |
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| 209 | ENDIF |
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| 210 | ! |
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| 211 | ENDIF |
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| 212 | ! |
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| 213 | END SUBROUTINE tra_npc |
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| 214 | |
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| 215 | !!====================================================================== |
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| 216 | END MODULE tranpc |
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