1 | MODULE dynldf_bilap |
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2 | !!====================================================================== |
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3 | !! *** MODULE dynldf_bilap *** |
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4 | !! Ocean dynamics: lateral viscosity trend |
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5 | !!====================================================================== |
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6 | |
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7 | !!---------------------------------------------------------------------- |
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8 | !! dyn_ldf_bilap : update the momentum trend with the lateral diffusion |
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9 | !! using an iso-level bilaplacian operator |
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10 | !!---------------------------------------------------------------------- |
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11 | !! * Modules used |
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12 | USE oce ! ocean dynamics and tracers |
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13 | USE dom_oce ! ocean space and time domain |
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14 | USE ldfdyn_oce ! ocean dynamics: lateral physics |
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15 | USE in_out_manager ! I/O manager |
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16 | USE trdmod ! ocean dynamics trends |
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17 | USE trdmod_oce ! ocean variables trends |
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18 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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19 | USE prtctl ! Print control |
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20 | |
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21 | IMPLICIT NONE |
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22 | PRIVATE |
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23 | |
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24 | !! * Routine accessibility |
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25 | PUBLIC dyn_ldf_bilap ! called by step.F90 |
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26 | |
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27 | !! * Substitutions |
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28 | # include "domzgr_substitute.h90" |
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29 | # include "ldfdyn_substitute.h90" |
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30 | # include "vectopt_loop_substitute.h90" |
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31 | !!---------------------------------------------------------------------- |
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32 | !! OPA 9.0 , LOCEAN-IPSL (2005) |
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33 | !! $Header$ |
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34 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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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_ldf_bilap( kt ) |
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40 | !!---------------------------------------------------------------------- |
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41 | !! *** ROUTINE dyn_ldf_bilap *** |
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42 | !! |
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43 | !! ** Purpose : Compute the before trend of the lateral momentum |
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44 | !! diffusion and add it to the general trend of momentum equation. |
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45 | !! |
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46 | !! ** Method : The before horizontal momentum diffusion trend is a |
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47 | !! bi-harmonic operator (bilaplacian type) which separates the |
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48 | !! divergent and rotational parts of the flow. |
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49 | !! Its horizontal components are computed as follow: |
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50 | !! laplacian: |
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51 | !! zlu = 1/e1u di[ hdivb ] - 1/(e2u*e3u) dj-1[ e3f rotb ] |
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52 | !! zlv = 1/e2v dj[ hdivb ] + 1/(e1v*e3v) di-1[ e3f rotb ] |
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53 | !! third derivative: |
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54 | !! * multiply by the eddy viscosity coef. at u-, v-point, resp. |
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55 | !! zlu = ahmu * zlu |
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56 | !! zlv = ahmv * zlv |
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57 | !! * curl and divergence of the laplacian |
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58 | !! zuf = 1/(e1f*e2f) ( di[e2v zlv] - dj[e1u zlu] ) |
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59 | !! zut = 1/(e1t*e2t*e3t) ( di[e2u*e3u zlu] + dj[e1v*e3v zlv] ) |
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60 | !! bilaplacian: |
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61 | !! diffu = 1/e1u di[ zut ] - 1/(e2u*e3u) dj-1[ e3f zuf ] |
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62 | !! diffv = 1/e2v dj[ zut ] + 1/(e1v*e3v) di-1[ e3f zuf ] |
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63 | !! If lk_sco=F and lk_zps=F, the vertical scale factors in the |
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64 | !! rotational part of the diffusion are simplified |
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65 | !! Add this before trend to the general trend (ua,va): |
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66 | !! (ua,va) = (ua,va) + (diffu,diffv) |
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67 | !! 'key_trddyn' defined: the two components of the horizontal |
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68 | !! diffusion trend are saved. |
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69 | !! |
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70 | !! ** Action : - Update (ua,va) with the before iso-level biharmonic |
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71 | !! mixing trend. |
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72 | !! - Save in (ztdua,ztdva) the trends ('key_trddyn') |
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73 | !! |
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74 | !! History : |
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75 | !! ! 90-09 (G. Madec) Original code |
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76 | !! ! 91-11 (G. Madec) |
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77 | !! ! 93-03 (M. Guyon) symetrical conditions (M. Guyon) |
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78 | !! ! 96-01 (G. Madec) statement function for e3 |
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79 | !! ! 97-07 (G. Madec) lbc calls |
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80 | !! 8.5 ! 02-08 (G. Madec) F90: Free form and module |
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81 | !! 9.0 ! 04-08 (C. Talandier) New trends organization |
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82 | !!---------------------------------------------------------------------- |
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83 | !! * Modules used |
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84 | USE oce, ONLY : ztdua => ta, & ! use ta as 3D workspace |
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85 | ztdva => sa ! use sa as 3D workspace |
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86 | |
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87 | !! * Arguments |
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88 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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89 | |
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90 | !! * Local declarations |
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91 | INTEGER :: ji, jj, jk ! dummy loop indices |
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92 | REAL(wp) :: zua, zva, zbt, ze2u, ze2v ! temporary scalar |
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93 | REAL(wp), DIMENSION(jpi,jpj) :: & |
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94 | zuf, zut, zlu, zlv, zcu, zcv ! temporary workspace |
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95 | !!---------------------------------------------------------------------- |
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96 | !! OPA 8.5, LODYC-IPSL (2002) |
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97 | !!---------------------------------------------------------------------- |
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98 | |
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99 | IF( kt == nit000 ) THEN |
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100 | IF(lwp) WRITE(numout,*) |
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101 | IF(lwp) WRITE(numout,*) 'dyn_ldf_bilap : iso-level bilaplacian operator' |
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102 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~~' |
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103 | ENDIF |
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104 | zuf(:,:) = 0.e0 |
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105 | zut(:,:) = 0.e0 |
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106 | zlu(:,:) = 0.e0 |
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107 | zlv(:,:) = 0.e0 |
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108 | |
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109 | ! Save ua and va trends |
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110 | IF( l_trddyn ) THEN |
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111 | ztdua(:,:,:) = ua(:,:,:) |
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112 | ztdva(:,:,:) = va(:,:,:) |
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113 | ENDIF |
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114 | ! ! =============== |
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115 | DO jk = 1, jpkm1 ! Horizontal slab |
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116 | ! ! =============== |
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117 | ! Laplacian |
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118 | ! --------- |
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119 | |
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120 | IF( lk_sco .OR. lk_zps ) THEN ! s-coordinate or z-coordinate with partial steps |
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121 | zuf(:,:) = rotb(:,:,jk) * fse3f(:,:,jk) |
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122 | DO jj = 2, jpjm1 |
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123 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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124 | zlu(ji,jj) = - ( zuf(ji,jj) - zuf(ji,jj-1) ) / ( e2u(ji,jj) * fse3u(ji,jj,jk) ) & |
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125 | & + ( hdivb(ji+1,jj,jk) - hdivb(ji,jj,jk) ) / e1u(ji,jj) |
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126 | |
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127 | zlv(ji,jj) = + ( zuf(ji,jj) - zuf(ji-1,jj) ) / ( e1v(ji,jj) * fse3v(ji,jj,jk) ) & |
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128 | & + ( hdivb(ji,jj+1,jk) - hdivb(ji,jj,jk) ) / e2v(ji,jj) |
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129 | END DO |
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130 | END DO |
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131 | ELSE ! z-coordinate |
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132 | DO jj = 2, jpjm1 |
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133 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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134 | zlu(ji,jj) = - ( rotb (ji ,jj,jk) - rotb (ji,jj-1,jk) ) / e2u(ji,jj) & |
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135 | & + ( hdivb(ji+1,jj,jk) - hdivb(ji,jj ,jk) ) / e1u(ji,jj) |
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136 | |
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137 | zlv(ji,jj) = + ( rotb (ji,jj ,jk) - rotb (ji-1,jj,jk) ) / e1v(ji,jj) & |
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138 | & + ( hdivb(ji,jj+1,jk) - hdivb(ji ,jj,jk) ) / e2v(ji,jj) |
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139 | END DO |
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140 | END DO |
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141 | ENDIF |
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142 | |
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143 | ! Boundary conditions on the laplacian (zlu,zlv) |
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144 | CALL lbc_lnk( zlu, 'U', -1. ) |
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145 | CALL lbc_lnk( zlv, 'V', -1. ) |
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146 | |
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147 | |
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148 | ! Third derivative |
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149 | ! ---------------- |
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150 | |
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151 | ! Multiply by the eddy viscosity coef. (at u- and v-points) |
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152 | zlu(:,:) = zlu(:,:) * fsahmu(:,:,jk) |
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153 | zlv(:,:) = zlv(:,:) * fsahmv(:,:,jk) |
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154 | |
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155 | ! Contravariant "laplacian" |
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156 | zcu(:,:) = e1u(:,:) * zlu(:,:) |
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157 | zcv(:,:) = e2v(:,:) * zlv(:,:) |
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158 | |
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159 | ! Laplacian curl ( * e3f if s-coordinates or z-coordinate with partial steps) |
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160 | DO jj = 1, jpjm1 |
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161 | DO ji = 1, fs_jpim1 ! vector opt. |
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162 | zuf(ji,jj) = fmask(ji,jj,jk) * ( zcv(ji+1,jj ) - zcv(ji,jj) & |
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163 | & - zcu(ji ,jj+1) + zcu(ji,jj) ) & |
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164 | #if defined key_s_coord || defined key_partial_steps |
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165 | & * fse3f(ji,jj,jk) / ( e1f(ji,jj)*e2f(ji,jj) ) |
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166 | #else |
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167 | & / ( e1f(ji,jj)*e2f(ji,jj) ) |
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168 | #endif |
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169 | END DO |
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170 | END DO |
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171 | |
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172 | ! Laplacian Horizontal fluxes |
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173 | DO jj = 1, jpjm1 |
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174 | DO ji = 1, fs_jpim1 ! vector opt. |
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175 | #if defined key_s_coord || defined key_partial_steps |
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176 | zlu(ji,jj) = e2u(ji,jj) * fse3u(ji,jj,jk) * zlu(ji,jj) |
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177 | zlv(ji,jj) = e1v(ji,jj) * fse3v(ji,jj,jk) * zlv(ji,jj) |
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178 | #else |
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179 | zlu(ji,jj) = e2u(ji,jj) * zlu(ji,jj) |
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180 | zlv(ji,jj) = e1v(ji,jj) * zlv(ji,jj) |
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181 | #endif |
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182 | END DO |
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183 | END DO |
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184 | |
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185 | ! Laplacian divergence |
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186 | DO jj = 2, jpj |
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187 | DO ji = fs_2, jpi ! vector opt. |
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188 | #if defined key_s_coord || defined key_partial_steps |
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189 | zbt = e1t(ji,jj) * e2t(ji,jj) * fse3t(ji,jj,jk) |
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190 | #else |
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191 | zbt = e1t(ji,jj) * e2t(ji,jj) |
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192 | #endif |
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193 | zut(ji,jj) = ( zlu(ji,jj) - zlu(ji-1,jj ) & |
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194 | & + zlv(ji,jj) - zlv(ji ,jj-1) ) / zbt |
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195 | END DO |
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196 | END DO |
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197 | |
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198 | |
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199 | ! boundary conditions on the laplacian curl and div (zuf,zut) |
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200 | CALL lbc_lnk( zuf, 'F', 1. ) |
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201 | CALL lbc_lnk( zut, 'T', 1. ) |
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202 | |
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203 | |
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204 | ! Bilaplacian |
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205 | ! ----------- |
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206 | |
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207 | DO jj = 2, jpjm1 |
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208 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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209 | #if defined key_s_coord || defined key_partial_steps |
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210 | ze2u = e2u(ji,jj) * fse3u(ji,jj,jk) |
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211 | ze2v = e1v(ji,jj) * fse3v(ji,jj,jk) |
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212 | #else |
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213 | ze2u = e2u(ji,jj) |
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214 | ze2v = e1v(ji,jj) |
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215 | #endif |
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216 | ! horizontal biharmonic diffusive trends |
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217 | zua = - ( zuf(ji ,jj) - zuf(ji,jj-1) ) / ze2u & |
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218 | & + ( zut(ji+1,jj) - zut(ji,jj ) ) / e1u(ji,jj) |
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219 | |
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220 | zva = + ( zuf(ji,jj ) - zuf(ji-1,jj) ) / ze2v & |
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221 | & + ( zut(ji,jj+1) - zut(ji ,jj) ) / e2v(ji,jj) |
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222 | ! add it to the general momentum trends |
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223 | ua(ji,jj,jk) = ua(ji,jj,jk) + zua |
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224 | va(ji,jj,jk) = va(ji,jj,jk) + zva |
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225 | END DO |
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226 | END DO |
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227 | |
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228 | ! ! =============== |
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229 | END DO ! End of slab |
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230 | ! ! =============== |
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231 | ! save the lateral diffusion trends for diagnostic |
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232 | ! momentum trends |
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233 | IF( l_trddyn ) THEN |
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234 | ztdua(:,:,:) = ua(:,:,:) - ztdua(:,:,:) |
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235 | ztdva(:,:,:) = va(:,:,:) - ztdva(:,:,:) |
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236 | |
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237 | CALL trd_mod(ztdua, ztdva, jpdtdldf, 'DYN', kt) |
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238 | ENDIF |
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239 | |
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240 | IF(ln_ctl) THEN ! print sum trends (used for debugging) |
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241 | CALL prt_ctl(tab3d_1=ua, clinfo1=' ldf - Ua: ', mask1=umask, & |
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242 | & tab3d_2=va, clinfo2=' Va: ', mask2=vmask, clinfo3='dyn') |
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243 | ENDIF |
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244 | |
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245 | END SUBROUTINE dyn_ldf_bilap |
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246 | |
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247 | !!====================================================================== |
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248 | END MODULE dynldf_bilap |
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