1 | MODULE traldf_bilap |
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2 | !!============================================================================== |
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3 | !! *** MODULE traldf_bilap *** |
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4 | !! Ocean tracers: horizontal component of the lateral tracer mixing trend |
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5 | !!============================================================================== |
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6 | !! History : ! 91-11 (G. Madec) Original code |
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7 | !! ! 93-03 (M. Guyon) symetrical conditions |
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8 | !! ! 95-11 (G. Madec) suppress volumetric scale factors |
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9 | !! ! 96-01 (G. Madec) statement function for e3 |
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10 | !! ! 96-01 (M. Imbard) mpp exchange |
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11 | !! ! 97-07 (G. Madec) optimization, and ahtt |
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12 | !! 8.5 ! 02-08 (G. Madec) F90: Free form and module |
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13 | !! 9.0 ! 04-08 (C. Talandier) New trends organization |
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14 | !! ! 05-11 (G. Madec) zps or sco as default option |
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15 | !! 3.3 ! 10-05 (C. Ethe, G. Madec) merge TRC-TRA |
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16 | !!============================================================================== |
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17 | |
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18 | !!---------------------------------------------------------------------- |
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19 | !! tra_ldf_bilap : update the tracer trend with the horizontal diffusion |
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20 | !! using a iso-level biharmonic operator |
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21 | !!---------------------------------------------------------------------- |
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22 | !! * Modules used |
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23 | USE oce ! ocean dynamics and active tracers |
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24 | USE dom_oce ! ocean space and time domain |
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25 | USE ldftra_oce ! ocean tracer lateral physics |
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26 | USE in_out_manager ! I/O manager |
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27 | USE ldfslp ! iso-neutral slopes |
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28 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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29 | USE diaptr ! poleward transport diagnostics |
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30 | |
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31 | IMPLICIT NONE |
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32 | PRIVATE |
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33 | |
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34 | !! * Routine accessibility |
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35 | PUBLIC tra_ldf_bilap ! routine called by step.F90 |
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36 | |
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37 | !! * Substitutions |
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38 | # include "domzgr_substitute.h90" |
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39 | # include "ldftra_substitute.h90" |
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40 | # include "ldfeiv_substitute.h90" |
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41 | # include "vectopt_loop_substitute.h90" |
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42 | !!---------------------------------------------------------------------- |
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43 | !! NEMO/OPA 3.3 , LOCEAN-IPSL (2010) |
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44 | !! $Id$ |
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45 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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46 | !!---------------------------------------------------------------------- |
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47 | |
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48 | CONTAINS |
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49 | |
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50 | SUBROUTINE tra_ldf_bilap( kt, cdtype, pgu, pgv, & |
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51 | & ptb, pta, kjpt ) |
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52 | !!---------------------------------------------------------------------- |
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53 | !! *** ROUTINE tra_ldf_bilap *** |
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54 | !! |
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55 | !! ** Purpose : Compute the before horizontal tracer diffusive |
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56 | !! trend and add it to the general trend of tracer equation. |
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57 | !! |
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58 | !! ** Method : 4th order diffusive operator along model level surfaces |
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59 | !! evaluated using before fields (forward time scheme). The hor. |
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60 | !! diffusive trends is given by: |
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61 | !! Laplacian of tb: |
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62 | !! zlt = 1/(e1t*e2t*e3t) { di-1[ e2u*e3u/e1u di(tb) ] |
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63 | !! + dj-1[ e1v*e3v/e2v dj(tb) ] } |
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64 | !! Multiply by the eddy diffusivity coef. and insure lateral bc: |
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65 | !! zlt = ahtt * zlt |
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66 | !! call to lbc_lnk |
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67 | !! Bilaplacian (laplacian of zlt): |
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68 | !! difft = 1/(e1t*e2t*e3t) { di-1[ e2u*e3u/e1u di(zlt) ] |
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69 | !! + dj-1[ e1v*e3v/e2v dj(zlt) ] } |
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70 | !! |
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71 | !! Add this trend to the general trend |
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72 | !! (pta) = (pta) + ( difft ) |
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73 | !! |
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74 | !! ** Action : - Update pta arrays with the before iso-level |
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75 | !! biharmonic mixing trend. |
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76 | !!---------------------------------------------------------------------- |
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77 | !! |
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78 | USE oce , ztu => ua ! use ua as workspace |
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79 | USE oce , ztv => va ! use va as workspace |
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80 | !! |
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81 | INTEGER , INTENT(in ) :: kt ! ocean time-step index |
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82 | CHARACTER(len=3), INTENT(in ) :: cdtype ! =TRA or TRC (tracer indicator) |
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83 | INTEGER , INTENT(in ) :: kjpt ! number of tracers |
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84 | REAL(wp) , INTENT(in ), DIMENSION(jpi,jpj,kjpt ) :: pgu, pgv ! tracer gradient at pstep levels |
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85 | REAL(wp) , INTENT(in ), DIMENSION(jpi,jpj,jpk,kjpt) :: ptb ! before and now tracer fields |
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86 | REAL(wp) , INTENT(inout), DIMENSION(jpi,jpj,jpk,kjpt) :: pta ! tracer trend |
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87 | !! |
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88 | INTEGER :: ji, jj, jk, jn ! dummy loop indices |
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89 | INTEGER :: iku, ikv ! temporary integers |
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90 | REAL(wp) :: zbtr, ztra ! temporary scalars |
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91 | REAL(wp), DIMENSION(jpi,jpj) :: & |
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92 | zeeu, zeev, zlt ! 2D workspace |
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93 | !!---------------------------------------------------------------------- |
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94 | |
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95 | IF( kt == nit000 ) THEN |
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96 | IF(lwp) WRITE(numout,*) |
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97 | IF(lwp) WRITE(numout,*) 'tra_ldf_bilap : iso-level biharmonic operator' |
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98 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~~' |
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99 | ENDIF |
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100 | ! ! =========== |
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101 | DO jn = 1, kjpt ! tracer loop |
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102 | ! ! =========== |
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103 | ! |
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104 | DO jk = 1, jpkm1 |
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105 | ! |
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106 | |
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107 | ! 0. Initialization of metric arrays (for z- or s-coordinates) |
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108 | ! ---------------------------------- |
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109 | DO jj = 1, jpjm1 |
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110 | DO ji = 1, fs_jpim1 ! vector opt. |
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111 | zeeu(ji,jj) = e2u(ji,jj) * fse3u(ji,jj,jk) / e1u(ji,jj) * umask(ji,jj,jk) |
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112 | zeev(ji,jj) = e1v(ji,jj) * fse3v(ji,jj,jk) / e2v(ji,jj) * vmask(ji,jj,jk) |
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113 | END DO |
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114 | END DO |
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115 | |
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116 | |
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117 | ! 1. Laplacian |
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118 | ! ------------ |
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119 | |
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120 | ! First derivative (gradient) |
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121 | DO jj = 1, jpjm1 |
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122 | DO ji = 1, fs_jpim1 ! vector opt. |
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123 | ztu(ji,jj,jk) = zeeu(ji,jj) * ( ptb(ji+1,jj ,jk,jn) - ptb(ji,jj,jk,jn) ) |
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124 | ztv(ji,jj,jk) = zeev(ji,jj) * ( ptb(ji ,jj+1,jk,jn) - ptb(ji,jj,jk,jn) ) |
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125 | END DO |
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126 | END DO |
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127 | IF( ln_zps ) THEN ! set gradient at partial step level |
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128 | DO jj = 1, jpjm1 |
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129 | DO ji = 1, jpim1 |
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130 | ! last level |
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131 | iku = MIN ( mbathy(ji,jj), mbathy(ji+1,jj ) ) - 1 |
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132 | ikv = MIN ( mbathy(ji,jj), mbathy(ji ,jj+1) ) - 1 |
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133 | IF( iku == jk ) ztu(ji,jj,jk) = zeeu(ji,jj) * pgu(ji,jj,jn) |
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134 | IF( ikv == jk ) ztv(ji,jj,jk) = zeev(ji,jj) * pgv(ji,jj,jn) |
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135 | END DO |
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136 | END DO |
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137 | ENDIF |
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138 | |
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139 | ! Second derivative (divergence) multiply by the eddy diffusivity coefficient |
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140 | DO jj = 2, jpjm1 |
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141 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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142 | zbtr = 1.0 / ( e1t(ji,jj) * e2t(ji,jj) * fse3t(ji,jj,jk) ) |
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143 | zlt(ji,jj) = fsahtt(ji,jj,jk) & |
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144 | & * zbtr * ( ztu(ji,jj,jk) - ztu(ji-1,jj,jk) + ztv(ji,jj,jk) - ztv(ji,jj-1,jk) ) |
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145 | END DO |
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146 | END DO |
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147 | |
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148 | ! Lateral boundary conditions on the laplacian (zlt) (unchanged sgn) |
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149 | CALL lbc_lnk( zlt, 'T', 1. ) |
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150 | |
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151 | ! 2. Bilaplacian |
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152 | ! -------------- |
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153 | |
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154 | ! third derivative (gradient) |
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155 | DO jj = 1, jpjm1 |
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156 | DO ji = 1, fs_jpim1 ! vector opt. |
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157 | ztu(ji,jj,jk) = zeeu(ji,jj) * ( zlt(ji+1,jj ) - zlt(ji,jj) ) |
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158 | ztv(ji,jj,jk) = zeev(ji,jj) * ( zlt(ji ,jj+1) - zlt(ji,jj) ) |
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159 | END DO |
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160 | END DO |
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161 | |
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162 | ! fourth derivative (divergence) and add to the general tracer trend |
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163 | DO jj = 2, jpjm1 |
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164 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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165 | ! horizontal diffusive trends |
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166 | zbtr = 1.0 / ( e1t(ji,jj) * e2t(ji,jj) * fse3t(ji,jj,jk) ) |
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167 | ztra = zbtr * ( ztu(ji,jj,jk) - ztu(ji-1,jj,jk) + ztv(ji,jj,jk) - ztv(ji,jj-1,jk) ) |
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168 | ! add it to the general tracer trends |
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169 | pta(ji,jj,jk,jn) = pta(ji,jj,jk,jn) + ztra |
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170 | END DO |
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171 | END DO |
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172 | ! ! =============== |
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173 | END DO ! Horizontal slab |
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174 | ! ! =============== |
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175 | ! "zonal" mean lateral diffusive heat and salt transport |
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176 | IF( cdtype == 'TRA' .AND. ln_diaptr .AND. ( MOD( kt, nf_ptr ) == 0 ) ) THEN |
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177 | IF( jn == jp_tem ) pht_ldf(:) = ptr_vj( ztv(:,:,:) ) |
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178 | IF( jn == jp_sal ) pst_ldf(:) = ptr_vj( ztv(:,:,:) ) |
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179 | ENDIF |
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180 | ! |
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181 | END DO |
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182 | |
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183 | END SUBROUTINE tra_ldf_bilap |
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184 | |
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185 | !!============================================================================== |
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186 | END MODULE traldf_bilap |
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