1 | MODULE dynzdf_iso |
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2 | !!============================================================================== |
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3 | !! *** MODULE dynzdf_iso *** |
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4 | !! Ocean dynamics: vertical component(s) of the momentum mixing trend |
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5 | !!============================================================================== |
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6 | #if defined key_ldfslp || defined key_esopa |
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7 | !!---------------------------------------------------------------------- |
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8 | !! 'key_ldfslp' rotation of the mixing tensor |
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9 | !!---------------------------------------------------------------------- |
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10 | !! dyn_zdf_iso : update the momentum trend with the vertical diffusion |
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11 | !! (vertical mixing + vertical component of lateral |
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12 | !! mixing) (rotated lateral operator case) |
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13 | !!---------------------------------------------------------------------- |
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14 | !! * Modules used |
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15 | USE oce ! ocean dynamics and tracers |
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16 | USE dom_oce ! ocean space and time domain |
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17 | USE phycst ! physical constants |
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18 | USE zdf_oce ! ocean vertical physics |
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19 | USE in_out_manager ! I/O manager |
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20 | USE taumod ! surface ocean stress |
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21 | USE trdmod ! ocean dynamics trends |
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22 | USE trdmod_oce ! ocean variables trends |
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23 | |
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24 | IMPLICIT NONE |
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25 | PRIVATE |
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26 | |
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27 | !! * Routine accessibility |
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28 | PUBLIC dyn_zdf_iso ! 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 | # include "vectopt_loop_substitute.h90" |
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33 | !!---------------------------------------------------------------------- |
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34 | !! OPA 9.0 , LODYC-IPSL (2003) |
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35 | !!---------------------------------------------------------------------- |
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36 | |
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37 | CONTAINS |
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38 | |
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39 | SUBROUTINE dyn_zdf_iso( kt ) |
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40 | !!---------------------------------------------------------------------- |
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41 | !! *** ROUTINE dyn_zdf_iso *** |
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42 | !! |
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43 | !! ** Purpose : |
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44 | !! Compute the vertical momentum trend due to both vertical and |
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45 | !! lateral mixing (only for second order lateral operator, for |
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46 | !! fourth order it is already computed and add to the general trend |
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47 | !! in dynldf.F) and the surface forcing, and add it to the general |
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48 | !! trend of the momentum equations. |
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49 | !! |
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50 | !! ** Method : |
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51 | !! The vertical component of the lateral diffusive trends is |
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52 | !! provided by a 2nd order operator rotated along neural or geopo- |
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53 | !! tential surfaces to which an eddy induced advection can be added |
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54 | !! It is computed using before fields (forward in time) and isopyc- |
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55 | !! nal or geopotential slopes computed in routine ldfslp. |
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56 | !! |
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57 | !! First part: vertical trends associated with the lateral mixing |
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58 | !! ========== (excluding the vertical flux proportional to dk[U] ) |
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59 | !! vertical fluxes associated with the rotated lateral mixing: |
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60 | !! zfuw =-ahm { e2t*mi(wslpi) di[ mi(mk(ub)) ] |
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61 | !! + e1t*mj(wslpj) dj[ mj(mk(ub)) ] } |
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62 | !! update and save in zavt the vertical eddy viscosity coefficient: |
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63 | !! avmu = avmu + mi(wslpi)^2 + mj(wslj)^2 |
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64 | !! take the horizontal divergence of the fluxes: |
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65 | !! diffu = 1/(e1u*e2u*e3u) dk[ zfuw ] |
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66 | !! Add this trend to the general trend (ta,sa): |
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67 | !! ua = ua + difft |
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68 | !! |
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69 | !! Second part: vertical trend associated with the vertical physics |
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70 | !! =========== (including the vertical flux proportional to dk[U] |
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71 | !! associated with the lateral mixing, through the |
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72 | !! update of avmu) |
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73 | !! The vertical diffusion of momentum is given by: |
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74 | !! diffu = dz( avmu dz(u) ) = 1/e3u dk+1( avmu/e3uw dk(ua) ) |
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75 | !! using a backward (implicit) time stepping. |
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76 | !! Bottom boundary conditions : bottom stress (cf zdfbfr.F) |
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77 | !! Add this trend to the general trend ua : |
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78 | !! ua = ua + dz( avmu dz(u) ) |
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79 | !! |
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80 | !! 'key_trddyn' defined: trend saved for further diagnostics. |
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81 | !! |
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82 | !! macro-tasked on vertical slab (jj-loop) |
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83 | !! |
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84 | !! ** Action : - Update (ua,va) arrays with the after vertical diffusive |
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85 | !! mixing trend. |
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86 | !! - Save the trends in (ztdua,ztdva) ('key_trddyn') |
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87 | !! |
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88 | !! History : |
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89 | !! ! 90-10 (B. Blanke) Original code |
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90 | !! ! 97-05 (G. Madec) vertical component of isopycnal |
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91 | !! 8.5 ! 02-08 (G. Madec) F90: Free form and module |
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92 | !! 9.0 ! 04-08 (C. Talandier) New trends organization |
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93 | !!--------------------------------------------------------------------- |
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94 | !! * Modules used |
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95 | USE ldfslp , ONLY : wslpi, wslpj |
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96 | USE ldftra_oce, ONLY : aht0 |
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97 | USE oce, ONLY : ztdua => ta, & ! use ta as 3D workspace |
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98 | ztdva => sa ! use sa as 3D workspace |
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99 | |
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100 | !! * Arguments |
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101 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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102 | |
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103 | !! * Local declarations |
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104 | INTEGER :: ji, jj, jk ! dummy loop indices |
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105 | INTEGER :: & |
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106 | ikst, ikenm2, ikstp1, & ! temporary integers |
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107 | ikbu, ikbum1 , ikbv, ikbvm1 ! " " |
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108 | REAL(wp) :: & |
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109 | zrau0r, z2dt, & ! temporary scalars |
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110 | z2dtf, zua, zva, zcoef, zzws |
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111 | REAL(wp) :: & |
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112 | zcoef0, zcoef3, zcoef4, zbu, zbv, zmkt, zmkf, & |
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113 | zuav, zvav, zuwslpi, zuwslpj, zvwslpi, zvwslpj |
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114 | REAL(wp), DIMENSION(jpi,jpk) :: & |
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115 | zwx, zwy, zwz, & ! workspace arrays |
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116 | zwd, zws, zwi, zwt, & ! " " |
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117 | zfuw, zdiu, zdju, zdj1u, & ! " " |
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118 | zfvw, zdiv, zdjv, zdj1v |
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119 | REAL(wp), DIMENSION(jpi,jpj) :: & |
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120 | ztsx, ztsy, ztbx, ztby ! temporary workspace arrays |
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121 | !!---------------------------------------------------------------------- |
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122 | |
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123 | IF( kt == nit000 ) THEN |
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124 | IF(lwp) WRITE(numout,*) |
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125 | IF(lwp) WRITE(numout,*) 'dyn_zdf_iso : vertical momentum diffusion isopycnal operator' |
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126 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~ ' |
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127 | ENDIF |
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128 | |
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129 | ! 0. Local constant initialization |
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130 | ! -------------------------------- |
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131 | |
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132 | ! inverse of the reference density |
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133 | zrau0r = 1. / rau0 |
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134 | ! Leap-frog environnement |
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135 | z2dt = 2. * rdt |
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136 | ! workspace arrays |
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137 | ztsx(:,:) = 0.e0 |
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138 | ztsy(:,:) = 0.e0 |
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139 | ztbx(:,:) = 0.e0 |
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140 | ztby(:,:) = 0.e0 |
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141 | ! Euler time stepping when starting from rest |
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142 | IF ( neuler == 0 .AND. kt == nit000 ) z2dt = rdt |
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143 | |
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144 | ! Save ua and va trends |
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145 | IF( l_trddyn ) THEN |
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146 | ztdua(:,:,:) = ua(:,:,:) |
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147 | ztdva(:,:,:) = va(:,:,:) |
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148 | ENDIF |
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149 | |
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150 | ! ! =============== |
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151 | DO jj = 2, jpjm1 ! Vertical slab |
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152 | ! ! =============== |
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153 | |
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154 | |
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155 | ! I. vertical trends associated with the lateral mixing |
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156 | ! ===================================================== |
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157 | ! (excluding the vertical flux proportional to dk[t] |
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158 | |
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159 | |
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160 | ! I.1 horizontal momentum gradient |
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161 | ! -------------------------------- |
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162 | |
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163 | DO jk = 1, jpk |
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164 | DO ji = 2, jpi |
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165 | ! i-gradient of u at jj |
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166 | zdiu (ji,jk) = tmask(ji,jj ,jk) * ( ub(ji,jj ,jk) - ub(ji-1,jj ,jk) ) |
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167 | ! j-gradient of u and v at jj |
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168 | zdju (ji,jk) = fmask(ji,jj ,jk) * ( ub(ji,jj+1,jk) - ub(ji ,jj ,jk) ) |
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169 | zdjv (ji,jk) = tmask(ji,jj ,jk) * ( vb(ji,jj ,jk) - vb(ji ,jj-1,jk) ) |
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170 | ! j-gradient of u and v at jj+1 |
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171 | zdj1u(ji,jk) = fmask(ji,jj-1,jk) * ( ub(ji,jj ,jk) - ub(ji ,jj-1,jk) ) |
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172 | zdj1v(ji,jk) = tmask(ji,jj+1,jk) * ( vb(ji,jj+1,jk) - vb(ji ,jj ,jk) ) |
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173 | END DO |
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174 | END DO |
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175 | DO jk = 1, jpk |
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176 | DO ji = 1, jpim1 |
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177 | ! i-gradient of v at jj |
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178 | zdiv (ji,jk) = fmask(ji,jj ,jk) * ( vb(ji+1,jj,jk) - vb(ji ,jj ,jk) ) |
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179 | END DO |
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180 | END DO |
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181 | |
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182 | |
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183 | ! I.2 Vertical fluxes |
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184 | ! ------------------- |
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185 | |
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186 | ! Surface and bottom vertical fluxes set to zero |
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187 | DO ji = 1, jpi |
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188 | zfuw(ji, 1 ) = 0.e0 |
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189 | zfvw(ji, 1 ) = 0.e0 |
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190 | zfuw(ji,jpk) = 0.e0 |
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191 | zfvw(ji,jpk) = 0.e0 |
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192 | END DO |
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193 | |
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194 | ! interior (2=<jk=<jpk-1) on U field |
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195 | DO jk = 2, jpkm1 |
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196 | DO ji = 2, jpim1 |
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197 | zcoef0= 0.5 * aht0 * umask(ji,jj,jk) |
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198 | |
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199 | zuwslpi = zcoef0 * ( wslpi(ji+1,jj,jk) + wslpi(ji,jj,jk) ) |
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200 | zuwslpj = zcoef0 * ( wslpj(ji+1,jj,jk) + wslpj(ji,jj,jk) ) |
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201 | |
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202 | zmkt = 1./MAX( tmask(ji,jj,jk-1)+tmask(ji+1,jj,jk-1) & |
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203 | + tmask(ji,jj,jk )+tmask(ji+1,jj,jk ), 1. ) |
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204 | zmkf = 1./MAX( fmask(ji,jj-1,jk-1)+fmask(ji,jj,jk-1) & |
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205 | + fmask(ji,jj-1,jk )+fmask(ji,jj,jk ), 1. ) |
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206 | |
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207 | zcoef3 = - e2u(ji,jj) * zmkt * zuwslpi |
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208 | zcoef4 = - e1u(ji,jj) * zmkf * zuwslpj |
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209 | ! vertical flux on u field |
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210 | zfuw(ji,jk) = zcoef3 * ( zdiu (ji,jk-1) + zdiu (ji+1,jk-1) & |
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211 | +zdiu (ji,jk ) + zdiu (ji+1,jk ) ) & |
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212 | + zcoef4 * ( zdj1u(ji,jk-1) + zdju (ji ,jk-1) & |
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213 | +zdj1u(ji,jk ) + zdju (ji ,jk ) ) |
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214 | ! update avmu (add isopycnal vertical coefficient to avmu) |
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215 | avmu(ji,jj,jk) = avmu(ji,jj,jk) + ( zuwslpi * zuwslpi & |
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216 | + zuwslpj * zuwslpj ) / aht0 |
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217 | END DO |
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218 | END DO |
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219 | |
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220 | ! interior (2=<jk=<jpk-1) on V field |
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221 | DO jk = 2, jpkm1 |
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222 | DO ji = 2, jpim1 |
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223 | zcoef0= 0.5 * aht0 * vmask(ji,jj,jk) |
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224 | |
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225 | zvwslpi = zcoef0 * ( wslpi(ji,jj+1,jk) + wslpi(ji,jj,jk) ) |
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226 | zvwslpj = zcoef0 * ( wslpj(ji,jj+1,jk) + wslpj(ji,jj,jk) ) |
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227 | |
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228 | zmkf = 1./MAX( fmask(ji-1,jj,jk-1)+fmask(ji,jj,jk-1) & |
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229 | + fmask(ji-1,jj,jk )+fmask(ji,jj,jk ), 1. ) |
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230 | zmkt = 1./MAX( tmask(ji,jj,jk-1)+tmask(ji,jj+1,jk-1) & |
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231 | + tmask(ji,jj,jk )+tmask(ji,jj+1,jk ), 1. ) |
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232 | |
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233 | zcoef3 = - e2v(ji,jj) * zmkf * zvwslpi |
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234 | zcoef4 = - e1v(ji,jj) * zmkt * zvwslpj |
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235 | ! vertical flux on v field |
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236 | zfvw(ji,jk) = zcoef3 * ( zdiv (ji,jk-1) + zdiv (ji-1,jk-1) & |
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237 | +zdiv (ji,jk ) + zdiv (ji-1,jk ) ) & |
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238 | + zcoef4 * ( zdjv (ji,jk-1) + zdj1v(ji ,jk-1) & |
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239 | +zdjv (ji,jk ) + zdj1v(ji ,jk ) ) |
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240 | ! update avmv (add isopycnal vertical coefficient to avmv) |
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241 | avmv(ji,jj,jk) = avmv(ji,jj,jk) + ( zvwslpi * zvwslpi & |
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242 | + zvwslpj * zvwslpj ) / aht0 |
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243 | END DO |
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244 | END DO |
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245 | |
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246 | |
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247 | ! I.3 Divergence of vertical fluxes added to the general tracer trend |
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248 | ! ------------------------------------------------------------------- |
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249 | |
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250 | DO jk = 1, jpkm1 |
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251 | DO ji = 2, jpim1 |
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252 | ! volume elements |
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253 | zbu = e1u(ji,jj) * e2u(ji,jj) * fse3u(ji,jj,jk) |
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254 | zbv = e1v(ji,jj) * e2v(ji,jj) * fse3v(ji,jj,jk) |
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255 | ! part of the k-component of isopycnal momentum diffusive trends |
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256 | zuav = ( zfuw(ji,jk) - zfuw(ji,jk+1) ) / zbu |
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257 | zvav = ( zfvw(ji,jk) - zfvw(ji,jk+1) ) / zbv |
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258 | ! add the trends to the general trends |
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259 | ua(ji,jj,jk) = ua(ji,jj,jk) + zuav |
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260 | va(ji,jj,jk) = va(ji,jj,jk) + zvav |
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261 | END DO |
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262 | END DO |
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263 | ! ! =============== |
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264 | END DO ! End of slab |
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265 | ! ! =============== |
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266 | IF( l_trddyn ) THEN |
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267 | ! save these trends in addition to the lateral diffusion one for diagnostics |
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268 | uldftrd(:,:,:) = uldftrd(:,:,:) + ua(:,:,:) - ztdua(:,:,:) |
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269 | vldftrd(:,:,:) = vldftrd(:,:,:) + va(:,:,:) - ztdva(:,:,:) |
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270 | |
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271 | ! save new trends ua and va |
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272 | ztdua(:,:,:) = ua(:,:,:) |
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273 | ztdva(:,:,:) = va(:,:,:) |
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274 | ENDIF |
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275 | |
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276 | ! ! =============== |
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277 | DO jj = 2, jpjm1 ! Vertical slab |
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278 | ! ! =============== |
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279 | ! 1. Vertical diffusion on u |
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280 | ! --------------------------- |
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281 | |
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282 | ! 1.0 Matrix and second member construction |
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283 | ! bottom boundary condition: only zws must be masked as avmu can take |
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284 | ! non zero value at the ocean bottom depending on the bottom friction |
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285 | ! used (see zdfmix.F) |
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286 | DO jk = 1, jpkm1 |
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287 | DO ji = 2, jpim1 |
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288 | zcoef = - z2dt / fse3u(ji,jj,jk) |
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289 | zwi(ji,jk) = zcoef * avmu(ji,jj,jk ) / fse3uw(ji,jj,jk ) |
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290 | zzws = zcoef * avmu(ji,jj,jk+1) / fse3uw(ji,jj,jk+1) |
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291 | zws(ji,jk) = zzws * umask(ji,jj,jk+1) |
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292 | zwd(ji,jk) = 1. - zwi(ji,jk) - zzws |
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293 | zwy(ji,jk) = ub(ji,jj,jk) + z2dt * ua(ji,jj,jk) |
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294 | END DO |
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295 | END DO |
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296 | |
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297 | ! 1.1 Surface boudary conditions |
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298 | DO ji = 2, jpim1 |
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299 | z2dtf = z2dt / ( fse3u(ji,jj,1)*rau0 ) |
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300 | zwi(ji,1) = 0. |
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301 | zwd(ji,1) = 1. - zws(ji,1) |
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302 | zwy(ji,1) = zwy(ji,1) + z2dtf * taux(ji,jj) |
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303 | END DO |
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304 | |
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305 | ! 1.2 Matrix inversion starting from the first level |
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306 | ikst = 1 |
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307 | #include "zdf.matrixsolver.h90" |
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308 | |
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309 | ! 1.3 Normalization to obtain the general momentum trend ua |
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310 | DO jk = 1, jpkm1 |
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311 | DO ji = 2, jpim1 |
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312 | ua(ji,jj,jk) = ( zwx(ji,jk) - ub(ji,jj,jk) ) / z2dt |
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313 | END DO |
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314 | END DO |
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315 | |
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316 | ! 1.4 diagnose surface and bottom momentum fluxes |
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317 | DO ji = 2, jpim1 |
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318 | ! save the surface forcing momentum fluxes |
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319 | ztsx(ji,jj) = taux(ji,jj) / ( fse3u(ji,jj,1)*rau0 ) |
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320 | ! save bottom friction momentum fluxes |
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321 | ikbu = min( mbathy(ji+1,jj), mbathy(ji,jj) ) |
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322 | ikbum1 = max( ikbu-1, 1 ) |
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323 | ztbx(ji,jj) = - avmu(ji,jj,ikbu) * zwx(ji,ikbum1) & |
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324 | / ( fse3u(ji,jj,ikbum1)*fse3uw(ji,jj,ikbu) ) |
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325 | ! subtract surface forcing and bottom friction trend from vertical |
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326 | ! diffusive momentum trend |
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327 | ztdua(ji,jj,1 ) = ztdua(ji,jj,1 ) - ztsx(ji,jj) |
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328 | ztdua(ji,jj,ikbum1) = ztdua(ji,jj,ikbum1) - ztbx(ji,jj) |
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329 | END DO |
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330 | |
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331 | ! 2. Vertical diffusion on v |
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332 | ! --------------------------- |
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333 | |
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334 | ! 2.0 Matrix and second member construction |
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335 | ! bottom boundary condition: only zws must be masked as avmv can take |
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336 | ! non zero value at the ocean bottom depending on the bottom friction |
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337 | ! used (see zdfmix.F) |
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338 | DO jk = 1, jpkm1 |
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339 | DO ji = 2, jpim1 |
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340 | zcoef = -z2dt/fse3v(ji,jj,jk) |
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341 | zwi(ji,jk) = zcoef * avmv(ji,jj,jk ) / fse3vw(ji,jj,jk ) |
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342 | zzws = zcoef * avmv(ji,jj,jk+1) / fse3vw(ji,jj,jk+1) |
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343 | zws(ji,jk) = zzws * vmask(ji,jj,jk+1) |
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344 | zwd(ji,jk) = 1. - zwi(ji,jk) - zzws |
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345 | zwy(ji,jk) = vb(ji,jj,jk) + z2dt * va(ji,jj,jk) |
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346 | END DO |
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347 | END DO |
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348 | |
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349 | ! 2.1 Surface boudary conditions |
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350 | DO ji = 2, jpim1 |
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351 | z2dtf = z2dt / ( fse3v(ji,jj,1)*rau0 ) |
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352 | zwi(ji,1) = 0.e0 |
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353 | zwd(ji,1) = 1. - zws(ji,1) |
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354 | zwy(ji,1) = zwy(ji,1) + z2dtf * tauy(ji,jj) |
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355 | END DO |
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356 | |
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357 | ! 2.2 Matrix inversion starting from the first level |
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358 | ikst = 1 |
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359 | #include "zdf.matrixsolver.h90" |
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360 | |
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361 | ! 2.3 Normalization to obtain the general momentum trend va |
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362 | DO jk = 1, jpkm1 |
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363 | DO ji = 2, jpim1 |
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364 | va(ji,jj,jk) = ( zwx(ji,jk) - vb(ji,jj,jk) ) / z2dt |
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365 | END DO |
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366 | END DO |
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367 | |
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368 | ! 2.4 diagnose surface and bottom momentum fluxes |
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369 | DO ji = 2, jpim1 |
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370 | ! save the surface forcing momentum fluxes |
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371 | ztsy(ji,jj) = tauy(ji,jj) / ( fse3v(ji,jj,1)*rau0 ) |
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372 | ! save bottom friction momentum fluxes |
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373 | ikbv = min( mbathy(ji,jj+1), mbathy(ji,jj) ) |
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374 | ikbvm1 = max( ikbv-1, 1 ) |
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375 | ztby(ji,jj) = - avmv(ji,jj,ikbv) * zwx(ji,ikbvm1) & |
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376 | / ( fse3v(ji,jj,ikbvm1)*fse3vw(ji,jj,ikbv) ) |
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377 | ! subtract surface forcing and bottom friction trend from vertical |
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378 | ! diffusive momentum trend |
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379 | ztdva(ji,jj,1 ) = ztdva(ji,jj,1 ) - ztsy(ji,jj) |
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380 | ztdva(ji,jj,ikbvm1) = ztdva(ji,jj,ikbvm1) - ztby(ji,jj) |
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381 | END DO |
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382 | ! ! =============== |
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383 | END DO ! End of slab |
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384 | ! ! =============== |
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385 | |
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386 | ! save the vertical diffusive trends for diagnostic |
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387 | ! momentum trends |
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388 | IF( l_trddyn ) THEN |
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389 | ztdua(:,:,:) = ua(:,:,:) - ztdua(:,:,:) |
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390 | ztdva(:,:,:) = va(:,:,:) - ztdva(:,:,:) |
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391 | |
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392 | CALL trd_mod(uldftrd, vldftrd, jpdtdldf, 'DYN', kt) |
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393 | CALL trd_mod(ztdua, ztdva, jpdtdzdf, 'DYN', kt) |
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394 | ztdua(:,:,:) = 0.e0 |
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395 | ztdva(:,:,:) = 0.e0 |
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396 | ztdua(:,:,1) = ztsx(:,:) |
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397 | ztdva(:,:,1) = ztsy(:,:) |
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398 | CALL trd_mod(ztdua , ztdva , jpdtdswf, 'DYN', kt) |
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399 | ztdua(:,:,:) = 0.e0 |
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400 | ztdva(:,:,:) = 0.e0 |
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401 | ztdua(:,:,1) = ztbx(:,:) |
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402 | ztdva(:,:,1) = ztby(:,:) |
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403 | CALL trd_mod(ztdua , ztdva , jpdtdbfr, 'DYN', kt) |
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404 | ENDIF |
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405 | |
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406 | IF(l_ctl) THEN ! print sum trends (used for debugging) |
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407 | zua = SUM( ua(2:nictl,2:njctl,1:jpkm1) * umask(2:nictl,2:njctl,1:jpkm1) ) |
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408 | zva = SUM( va(2:nictl,2:njctl,1:jpkm1) * vmask(2:nictl,2:njctl,1:jpkm1) ) |
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409 | WRITE(numout,*) ' zdf - Ua: ', zua-u_ctl, ' Va: ', zva-v_ctl |
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410 | u_ctl = zua ; v_ctl = zva |
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411 | ENDIF |
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412 | |
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413 | END SUBROUTINE dyn_zdf_iso |
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414 | |
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415 | #else |
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416 | !!---------------------------------------------------------------------- |
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417 | !! Dummy module NO rotation of the mixing tensor |
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418 | !!---------------------------------------------------------------------- |
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419 | CONTAINS |
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420 | SUBROUTINE dyn_zdf_iso( kt ) ! Dummy routine |
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421 | WRITE(*,*) 'dyn_zdf_iso: You should not have seen this print! error?', kt |
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422 | END SUBROUTINE dyn_zdf_iso |
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423 | #endif |
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424 | |
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425 | !!============================================================================== |
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426 | END MODULE dynzdf_iso |
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