1 | MODULE traldf_bilap |
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2 | !!============================================================================== |
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3 | !! *** MODULE traldf_bilap *** |
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4 | !! Ocean active tracers: horizontal component of the lateral tracer mixing trend |
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5 | !!============================================================================== |
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6 | !! History : OPA ! 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 | !! NEMO ! 02-08 (G. Madec) F90: Free form and module |
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13 | !! 1.0 ! 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 | !! 2.4 ! 08-01 (G. Madec) Merge TRA-TRC |
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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 | USE dom_oce ! ocean space and time domain |
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23 | USE ldftra_oce ! ocean tracer lateral physics |
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24 | USE in_out_manager ! I/O manager |
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25 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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26 | USE diaptr ! poleward transport diagnostics |
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27 | USE prtctl ! Print control |
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28 | |
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29 | IMPLICIT NONE |
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30 | PRIVATE |
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31 | |
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32 | PUBLIC tra_ldf_bilap ! routine called by step.F90 |
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33 | |
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34 | !! * Substitutions |
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35 | # include "domzgr_substitute.h90" |
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36 | # include "ldftra_substitute.h90" |
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37 | # include "ldfeiv_substitute.h90" |
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38 | # include "vectopt_loop_substitute.h90" |
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39 | !!---------------------------------------------------------------------- |
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40 | !! NEMO/OPA 2.4 , LOCEAN-IPSL (2008) |
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41 | !! $Id:$ |
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42 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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43 | !!---------------------------------------------------------------------- |
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44 | |
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45 | CONTAINS |
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46 | |
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47 | SUBROUTINE tra_ldf_bilap( kt, cdtype, ktra, pgtu, pgtv, & |
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48 | & ptb , pta ) |
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49 | !!---------------------------------------------------------------------- |
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50 | !! *** ROUTINE tra_ldf_bilap *** |
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51 | !! |
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52 | !! ** Purpose : Compute the before horizontal tracer (t & s) diffusive |
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53 | !! trend and add it to the general trend of tracer equation. |
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54 | !! |
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55 | !! ** Method : 4th order diffusive operator along model level surfaces |
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56 | !! evaluated using before fields (forward time scheme). The hor. |
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57 | !! diffusive trends of temperature (idem for salinity) is given by: |
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58 | !! Laplacian of tb: |
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59 | !! zlt = 1/(e1t*e2t*e3t) { di-1[ e2u*e3u/e1u di(tb) ] |
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60 | !! + dj-1[ e1v*e3v/e2v dj(tb) ] } |
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61 | !! Multiply by the eddy diffusivity coef. and insure lateral bc: |
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62 | !! zlt = ahtt * zlt |
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63 | !! call to lbc_lnk |
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64 | !! Bilaplacian (laplacian of zlt): |
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65 | !! difft = 1/(e1t*e2t*e3t) { di-1[ e2u*e3u/e1u di(zlt) ] |
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66 | !! + dj-1[ e1v*e3v/e2v dj(zlt) ] } |
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67 | !! Note: if key_zco defined, e3t=e3u=e3v, they are simplified. |
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68 | !! |
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69 | !! Add this trend to the general trend (ta,sa): |
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70 | !! (ta,sa) = (ta,sa) + ( difft , diffs ) |
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71 | !! |
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72 | !! ** Action : - Update (ta,sa) arrays with the before iso-level |
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73 | !! biharmonic mixing trend. |
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74 | !!---------------------------------------------------------------------- |
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75 | INTEGER , INTENT(in ) :: kt ! ocean time-step index |
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76 | CHARACTER(len=3), INTENT(in ) :: cdtype ! =TRA or TRC (tracer indicator) |
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77 | INTEGER , INTENT(in ) :: ktra ! tracer index |
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78 | REAL(wp) , INTENT(in ), DIMENSION(jpi,jpj) :: pgtu, pgtv ! tracer gradient at pstep levels |
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79 | REAL(wp) , INTENT(in ), DIMENSION(jpi,jpj,jpk) :: ptb ! before tracer field |
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80 | REAL(wp) , INTENT(inout), DIMENSION(jpi,jpj,jpk) :: pta ! tracer trend |
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81 | !! |
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82 | INTEGER :: ji, jj, jk ! dummy loop indices |
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83 | INTEGER :: iku, ikv ! temporary integers |
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84 | REAL(wp), DIMENSION(jpi,jpj) :: zeeu, zeev, zbtr, zlt ! 2D workspace |
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85 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: ztu, ztv ! 3D workspace |
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86 | !!---------------------------------------------------------------------- |
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87 | |
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88 | IF( kt == nit000 ) THEN |
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89 | IF(lwp) WRITE(numout,*) |
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90 | IF(lwp) WRITE(numout,*) 'tra_ldf_bilap : iso-level biharmonic operator' |
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91 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~~' |
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92 | ENDIF |
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93 | |
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94 | |
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95 | ! ! =============== |
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96 | DO jk = 1, jpkm1 ! Horizontal slab |
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97 | ! ! =============== |
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98 | |
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99 | ! 0. Initialization of metric arrays (for z- or s-coordinates) |
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100 | ! ---------------------------------- |
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101 | |
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102 | DO jj = 1, jpjm1 |
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103 | DO ji = 1, fs_jpim1 ! vector opt. |
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104 | zbtr(ji,jj) = 1. / ( e1t(ji,jj)*e2t(ji,jj)*fse3t(ji,jj,jk) ) |
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105 | zeeu(ji,jj) = e2u(ji,jj) * fse3u(ji,jj,jk) / e1u(ji,jj) * umask(ji,jj,jk) |
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106 | zeev(ji,jj) = e1v(ji,jj) * fse3v(ji,jj,jk) / e2v(ji,jj) * vmask(ji,jj,jk) |
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107 | END DO |
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108 | END DO |
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109 | |
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110 | |
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111 | ! 1. Laplacian |
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112 | ! ------------ |
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113 | |
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114 | ! First derivative (gradient) |
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115 | DO jj = 1, jpjm1 |
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116 | DO ji = 1, fs_jpim1 ! vector opt. |
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117 | ztu(ji,jj,jk) = zeeu(ji,jj) * ( ptb(ji+1,jj ,jk) - ptb(ji,jj,jk) ) |
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118 | ztv(ji,jj,jk) = zeev(ji,jj) * ( ptb(ji ,jj+1,jk) - ptb(ji,jj,jk) ) |
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119 | END DO |
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120 | END DO |
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121 | IF( ln_zps ) THEN ! set gradient at partial step level |
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122 | DO jj = 1, jpjm1 |
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123 | DO ji = 1, jpim1 |
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124 | ! last level |
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125 | iku = MIN ( mbathy(ji,jj), mbathy(ji+1,jj ) ) - 1 |
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126 | ikv = MIN ( mbathy(ji,jj), mbathy(ji ,jj+1) ) - 1 |
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127 | IF( iku == jk ) ztu(ji,jj,jk) = zeeu(ji,jj) * pgtu(ji,jj) |
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128 | IF( ikv == jk ) ztv(ji,jj,jk) = zeev(ji,jj) * pgtv(ji,jj) |
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129 | END DO |
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130 | END DO |
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131 | ENDIF |
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132 | |
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133 | ! Second derivative (divergence) multiply by the eddy diffusivity coefficient |
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134 | DO jj = 2, jpjm1 |
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135 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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136 | zlt(ji,jj) = fsahtt(ji,jj,jk) * zbtr(ji,jj) & |
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137 | & * ( ztu(ji,jj,jk) - ztu(ji-1,jj,jk) + ztv(ji,jj,jk) - ztv(ji,jj-1,jk) ) |
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138 | END DO |
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139 | END DO |
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140 | |
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141 | !!gm k-loop must be cut here and a 3D lbclnk used |
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142 | |
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143 | ! Lateral boundary conditions on the laplacian (zlt) (unchanged sgn) |
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144 | CALL lbc_lnk( zlt, 'T', 1. ) |
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145 | |
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146 | ! 2. Bilaplacian |
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147 | ! -------------- |
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148 | |
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149 | DO jj = 1, jpjm1 ! third derivative (gradient) |
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150 | DO ji = 1, fs_jpim1 ! vector opt. |
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151 | ztu(ji,jj,jk) = zeeu(ji,jj) * ( zlt(ji+1,jj ) - zlt(ji,jj) ) |
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152 | ztv(ji,jj,jk) = zeev(ji,jj) * ( zlt(ji ,jj+1) - zlt(ji,jj) ) |
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153 | END DO |
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154 | END DO |
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155 | |
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156 | DO jj = 2, jpjm1 ! 4th derivative (divergence) and add to the general tracer trend |
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157 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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158 | pta(ji,jj,jk) = pta(ji,jj,jk) + zbtr(ji,jj) & |
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159 | & * ( ztu(ji,jj,jk) - ztu(ji-1,jj,jk) + ztv(ji,jj,jk) - ztv(ji,jj-1,jk) ) |
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160 | END DO |
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161 | END DO |
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162 | ! ! =============== |
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163 | END DO ! Horizontal slab |
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164 | ! ! =============== |
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165 | |
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166 | |
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167 | ! ! "Poleward" lateral diffusive heat or salt transport |
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168 | IF( cdtype == 'TRA' .AND. ln_diaptr .AND. ( MOD( kt, nf_ptr ) == 0 ) ) THEN |
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169 | IF( ktra == jp_tem) pht_ldf(:) = ptr_vj( ztv(:,:,:) ) |
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170 | IF( ktra == jp_sal) pst_ldf(:) = ptr_vj( ztv(:,:,:) ) |
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171 | ENDIF |
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172 | |
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173 | ! ! control print |
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174 | IF(ln_ctl) CALL prt_ctl( tab3d_1=pta, clinfo1=' ldf - bilap : ', mask1=tmask, clinfo3=cdtype ) |
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175 | ! |
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176 | END SUBROUTINE tra_ldf_bilap |
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177 | |
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178 | !!============================================================================== |
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179 | END MODULE traldf_bilap |
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