1 | MODULE trazdf_imp |
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2 | !!============================================================================== |
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3 | !! *** MODULE trazdf_imp *** |
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4 | !! Ocean active tracers: vertical component of the tracer mixing trend |
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5 | !!============================================================================== |
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6 | |
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7 | !!---------------------------------------------------------------------- |
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8 | !! tra_zdf_imp : update the tracer trend with the vertical diffusion |
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9 | !! using an implicit time-stepping. |
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10 | !!---------------------------------------------------------------------- |
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11 | !! * Modules used |
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12 | USE oce ! ocean dynamics and active tracers |
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13 | USE dom_oce ! ocean space and time domain |
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14 | USE zdf_oce ! ocean vertical physics |
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15 | USE ldftra_oce ! ocean active tracers: lateral physics |
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16 | USE zdfddm ! ocean vertical physics: double diffusion |
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17 | USE trdmod ! ocean active tracers trends |
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18 | USE trdmod_oce ! ocean variables trends |
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19 | USE in_out_manager ! I/O manager |
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20 | |
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21 | |
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22 | IMPLICIT NONE |
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23 | PRIVATE |
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24 | |
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25 | !! * Routine accessibility |
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26 | PUBLIC tra_zdf_imp ! routine called by step.F90 |
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27 | |
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28 | !! * Module variable |
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29 | REAL(wp), DIMENSION(jpk) :: & |
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30 | r2dt ! vertical profile of 2 x tracer time-step |
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31 | |
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32 | !! * Substitutions |
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33 | # include "domzgr_substitute.h90" |
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34 | # include "zdfddm_substitute.h90" |
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35 | !!---------------------------------------------------------------------- |
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36 | !! OPA 9.0 , LOCEAN-IPSL (2005) |
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37 | !! $Header$ |
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38 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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39 | !!---------------------------------------------------------------------- |
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40 | |
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41 | CONTAINS |
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42 | |
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43 | SUBROUTINE tra_zdf_imp( kt ) |
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44 | !!---------------------------------------------------------------------- |
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45 | !! *** ROUTINE tra_zdf_imp *** |
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46 | !! |
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47 | !! ** Purpose : Compute the trend due to the vertical tracer mixing |
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48 | !! using an implicit time stepping and add it to the general trend |
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49 | !! of the tracer equations. |
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50 | !! |
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51 | !! ** Method : The vertical diffusion of tracers (t & s) is given by: |
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52 | !! difft = dz( avt dz(t) ) = 1/e3t dk+1( avt/e3w dk(ta) ) |
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53 | !! It is thus evaluated using a backward time scheme |
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54 | !! Surface and bottom boundary conditions: no diffusive flux on |
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55 | !! both tracers (bottom, applied through the masked field avt). |
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56 | !! Add this trend to the general trend ta,sa : |
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57 | !! ta = ta + dz( avt dz(t) ) |
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58 | !! (sa = sa + dz( avs dz(t) ) if lk_zdfddm=T) |
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59 | !! |
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60 | !! ** Action : - Update (ta,sa) with the before vertical diffusion trend |
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61 | !! - save the trends in (ttrd,strd) ('key_trdtra') |
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62 | !! |
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63 | !! History : |
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64 | !! 6.0 ! 90-10 (B. Blanke) Original code |
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65 | !! 7.0 ! 91-11 (G. Madec) |
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66 | !! ! 92-06 (M. Imbard) correction on tracer trend loops |
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67 | !! ! 96-01 (G. Madec) statement function for e3 |
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68 | !! ! 97-05 (G. Madec) vertical component of isopycnal |
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69 | !! ! 97-07 (G. Madec) geopotential diffusion in s-coord |
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70 | !! ! 00-08 (G. Madec) double diffusive mixing |
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71 | !! 8.5 ! 02-08 (G. Madec) F90: Free form and module |
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72 | !! 9.0 ! 04-08 (C. Talandier) New trends organization |
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73 | !!--------------------------------------------------------------------- |
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74 | !! * Modules used |
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75 | USE oce, ONLY : ztdta => ua, & ! use ua as 3D workspace |
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76 | ztdsa => va ! use va as 3D workspace |
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77 | |
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78 | !! * Arguments |
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79 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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80 | |
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81 | !! * Local declarations |
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82 | INTEGER :: ji, jj, jk ! dummy loop indices |
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83 | INTEGER :: ikst, ikenm2, ikstp1 |
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84 | REAL(wp) :: zta, zsa ! temporary scalars |
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85 | REAL(wp), DIMENSION(jpi,jpk) :: & |
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86 | zwd, zws, zwi, & ! ??? |
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87 | zwx, zwy, zwz, zwt ! ??? |
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88 | !!--------------------------------------------------------------------- |
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89 | |
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90 | |
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91 | ! 0. Local constant initialization |
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92 | ! -------------------------------- |
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93 | |
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94 | ! time step = 2 rdttra ex |
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95 | IF( neuler == 0 .AND. kt == nit000 ) THEN |
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96 | r2dt(:) = rdttra(:) ! restarting with Euler time stepping |
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97 | ELSEIF( kt <= nit000 + 1) THEN |
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98 | r2dt(:) = 2. * rdttra(:) ! leapfrog |
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99 | ENDIF |
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100 | |
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101 | ! Save ta and sa trends |
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102 | IF( l_trdtra ) THEN |
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103 | ztdta(:,:,:) = ta(:,:,:) |
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104 | ztdsa(:,:,:) = sa(:,:,:) |
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105 | ENDIF |
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106 | |
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107 | ! ! =============== |
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108 | DO jj = 2, jpjm1 ! Vertical slab |
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109 | ! ! =============== |
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110 | ! 0. Matrix construction |
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111 | ! ---------------------- |
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112 | |
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113 | ! Diagonal, inferior, superior (including the bottom boundary condition via avt masked) |
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114 | DO jk = 1, jpkm1 |
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115 | DO ji = 2, jpim1 |
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116 | zwi(ji,jk) = - r2dt(jk) * avt(ji,jj,jk ) & |
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117 | / ( fse3t(ji,jj,jk) * fse3w(ji,jj,jk ) ) |
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118 | zws(ji,jk) = - r2dt(jk) * avt(ji,jj,jk+1) & |
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119 | / ( fse3t(ji,jj,jk) * fse3w(ji,jj,jk+1) ) |
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120 | zwd(ji,jk) = 1. - zwi(ji,jk) - zws(ji,jk) |
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121 | END DO |
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122 | END DO |
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123 | |
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124 | ! Surface boudary conditions |
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125 | DO ji = 2, jpim1 |
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126 | zwi(ji,1) = 0.e0 |
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127 | zwd(ji,1) = 1. - zws(ji,1) |
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128 | END DO |
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129 | |
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130 | ! 1. Vertical diffusion on temperature |
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131 | ! -------------------------=========== |
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132 | |
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133 | ! Second member construction |
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134 | DO jk = 1, jpkm1 |
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135 | DO ji = 2, jpim1 |
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136 | zwy(ji,jk) = tb(ji,jj,jk) + r2dt(jk) * ta(ji,jj,jk) |
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137 | END DO |
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138 | END DO |
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139 | |
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140 | ! Matrix inversion from the first level |
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141 | ikst = 1 |
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142 | |
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143 | # include "zdf.matrixsolver.h90" |
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144 | |
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145 | ! Save the masked temperature after in ta |
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146 | ! (c a u t i o n: temperature not its trend, Leap-frog scheme done |
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147 | ! it will not be done in tranxt) |
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148 | DO jk = 1, jpkm1 |
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149 | DO ji = 2, jpim1 |
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150 | ta(ji,jj,jk) = zwx(ji,jk) * tmask(ji,jj,jk) |
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151 | END DO |
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152 | END DO |
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153 | |
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154 | |
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155 | ! 2. Vertical diffusion on salinity |
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156 | ! -------------------------======== |
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157 | |
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158 | #if defined key_zdfddm |
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159 | ! Rebuild the Matrix as avt /= avs |
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160 | |
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161 | ! Diagonal, inferior, superior |
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162 | ! (including the bottom boundary condition via avs masked) |
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163 | DO jk = 1, jpkm1 |
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164 | DO ji = 2, jpim1 |
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165 | zwi(ji,jk) = - r2dt(jk) * fsavs(ji,jj,jk ) & |
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166 | /( fse3t(ji,jj,jk) * fse3w(ji,jj,jk ) ) |
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167 | zws(ji,jk) = - r2dt(jk) * fsavs(ji,jj,jk+1) & |
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168 | /( fse3t(ji,jj,jk) * fse3w(ji,jj,jk+1) ) |
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169 | zwd(ji,jk) = 1. - zwi(ji,jk) - zws(ji,jk) |
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170 | END DO |
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171 | END DO |
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172 | |
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173 | ! Surface boudary conditions |
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174 | DO ji = 2, jpim1 |
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175 | zwi(ji,1) = 0.e0 |
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176 | zwd(ji,1) = 1. - zws(ji,1) |
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177 | END DO |
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178 | #endif |
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179 | ! Second member construction |
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180 | DO jk = 1, jpkm1 |
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181 | DO ji = 2, jpim1 |
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182 | zwy(ji,jk) = sb(ji,jj,jk) + r2dt(jk) * sa(ji,jj,jk) |
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183 | END DO |
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184 | END DO |
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185 | |
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186 | ! Matrix inversion from the first level |
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187 | ikst = 1 |
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188 | |
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189 | # include "zdf.matrixsolver.h90" |
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190 | |
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191 | |
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192 | ! Save the masked salinity after in sa |
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193 | ! (c a u t i o n: salinity not its trend, Leap-frog scheme done |
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194 | ! it will not be done in tranxt) |
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195 | DO jk = 1, jpkm1 |
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196 | DO ji = 2, jpim1 |
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197 | sa(ji,jj,jk) = zwx(ji,jk) * tmask(ji,jj,jk) |
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198 | END DO |
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199 | END DO |
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200 | |
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201 | ! ! =============== |
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202 | END DO ! End of slab |
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203 | ! ! =============== |
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204 | |
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205 | ! save the trends for diagnostic |
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206 | ! Compute and save the vertical diffusive temperature & salinity trends |
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207 | IF( l_trdtra ) THEN |
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208 | ! compute the vertical diffusive trends in substracting the previous |
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209 | ! trends ztdta()/ztdsa() to the new one computed (dT/dt or dS/dt) |
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210 | ! with the new temperature/salinity ta/sa |
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211 | DO jk = 1, jpkm1 |
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212 | ztdta(:,:,jk) = ( ( ta(:,:,jk) - tb(:,:,jk) ) / r2dt(jk) ) & ! new trend |
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213 | & - ztdta(:,:,jk) ! old trend |
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214 | ztdsa(:,:,jk) = ( ( sa(:,:,jk) - sb(:,:,jk) ) / r2dt(jk) ) & ! new trend |
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215 | & - ztdsa(:,:,jk) ! old trend |
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216 | END DO |
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217 | |
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218 | CALL trd_mod(ztdta, ztdsa, jpttdzdf, 'TRA', kt) |
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219 | ENDIF |
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220 | |
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221 | IF(l_ctl) THEN ! print mean trends (used for debugging) |
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222 | zta = SUM( ta(2:nictl,2:njctl,1:jpkm1) * tmask(2:nictl,2:njctl,1:jpkm1) ) |
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223 | zsa = SUM( sa(2:nictl,2:njctl,1:jpkm1) * tmask(2:nictl,2:njctl,1:jpkm1) ) |
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224 | WRITE(numout,*) ' zdf - Ta: ', zta-t_ctl, ' Sa: ', zsa-s_ctl |
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225 | t_ctl = zta ; s_ctl = zsa |
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226 | ENDIF |
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227 | |
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228 | END SUBROUTINE tra_zdf_imp |
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229 | |
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230 | !!============================================================================== |
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231 | END MODULE trazdf_imp |
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