1 | MODULE limmsh_2 |
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2 | !!====================================================================== |
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3 | !! *** MODULE limmsh_2 *** |
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4 | !! LIM 2.0 ice model : definition of the ice mesh parameters |
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5 | !!====================================================================== |
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6 | !! History : LIM ! 2001-04 (Louvain-la-Neuve) Original code |
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7 | !! 1.0 ! 2002-08 (C. Ethe, G. Madec) |
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8 | !! 3.3 ! 2009-05 (G. Garric, C. Bricaud) addition of the lim2_evp case |
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9 | !!---------------------------------------------------------------------- |
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10 | #if defined key_lim2 |
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11 | !!---------------------------------------------------------------------- |
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12 | !! 'key_lim2' LIM 2.0sea-ice model |
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13 | !!---------------------------------------------------------------------- |
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14 | !! lim_msh_2 : definition of the ice mesh |
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15 | !!---------------------------------------------------------------------- |
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16 | USE phycst ! physical constants |
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17 | USE dom_oce ! ocean domain |
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18 | USE dom_ice_2 ! LIM2: ice domain |
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19 | USE lbclnk ! lateral boundary condition - MPP exchanges |
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20 | USE in_out_manager ! I/O manager |
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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 | PUBLIC lim_msh_2 ! routine called by ice_ini_2.F90 |
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26 | |
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27 | !!---------------------------------------------------------------------- |
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28 | !! NEMO/LIM2 3.3, UCL-LOCEAN-IPSL (2010) |
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29 | !! $Id$ |
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30 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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31 | !!---------------------------------------------------------------------- |
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32 | CONTAINS |
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33 | |
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34 | SUBROUTINE lim_msh_2 |
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35 | !!------------------------------------------------------------------- |
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36 | !! *** ROUTINE lim_msh_2 *** |
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37 | !! |
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38 | !! ** Purpose : Definition of the charact. of the numerical grid |
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39 | !! |
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40 | !! ** Action : - Initialisation of some variables |
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41 | !! - Definition of some constants linked with the grid |
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42 | !! - Definition of the metric coef. for the sea/ice |
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43 | !! - Initialization of the ice masks (tmsk, umsk) |
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44 | !! |
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45 | !! References : Deleersnijder et al. Ocean Modelling 100, 7-10 |
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46 | !!--------------------------------------------------------------------- |
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47 | INTEGER :: ji, jj ! dummy loop indices |
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48 | REAL(wp) :: zusden ! local scalars |
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49 | #if defined key_lim2_vp |
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50 | REAL(wp) :: zusden2 ! local scalars |
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51 | REAL(wp) :: zh1p , zh2p ! - - |
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52 | REAL(wp) :: zd2d1p, zd1d2p ! - - |
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53 | REAL(wp), DIMENSION(jpi,jpj) :: zd2d1 , zd1d2 ! 2D workspace |
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54 | #endif |
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55 | !!--------------------------------------------------------------------- |
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56 | ! |
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57 | IF(lwp) THEN |
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58 | WRITE(numout,*) |
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59 | WRITE(numout,*) 'lim_msh_2 : LIM 2.0 sea-ice model, mesh initialization' |
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60 | WRITE(numout,*) '~~~~~~~~~' |
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61 | ENDIF |
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62 | |
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63 | !---------------------------------------------------------- |
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64 | ! Initialization of local and some global (common) variables |
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65 | !------------------------------------------------------------------ |
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66 | |
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67 | njeq = INT( jpj / 2 ) !i bug mpp potentiel |
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68 | njeqm1 = njeq - 1 |
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69 | |
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70 | fcor(:,:) = 2. * omega * SIN( gphit(:,:) * rad ) ! coriolis factor at T-point |
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71 | |
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72 | IF( fcor(1,1) * fcor(1,nlcj) < 0.e0 ) THEN ! local domain include both hemisphere |
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73 | l_jeq = .TRUE. |
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74 | njeq = 1 |
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75 | DO WHILE ( njeq <= jpj .AND. fcor(1,njeq) < 0.e0 ) |
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76 | njeq = njeq + 1 |
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77 | END DO |
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78 | IF(lwp ) WRITE(numout,*) ' the equator is inside the domain at about njeq = ', njeq |
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79 | ELSEIF( fcor(1,1) < 0.e0 ) THEN |
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80 | l_jeq = .FALSE. |
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81 | njeq = jpj |
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82 | IF(lwp ) WRITE(numout,*) ' the model domain is entirely in the southern hemisphere: njeq = ', njeq |
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83 | ELSE |
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84 | l_jeq = .FALSE. |
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85 | njeq = 2 |
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86 | IF(lwp ) WRITE(numout,*) ' the model domain is entirely in the northern hemisphere: njeq = ', njeq |
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87 | ENDIF |
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88 | |
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89 | njeqm1 = njeq - 1 |
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90 | |
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91 | |
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92 | ! For each grid, definition of geometric tables |
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93 | !------------------------------------------------------------------ |
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94 | |
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95 | !------------------- |
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96 | ! Conventions : ! |
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97 | !------------------- |
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98 | ! indices 1 \ 2 <-> localisation in the 2 direction x \ y |
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99 | ! 3rd indice <-> localisation on the mesh : |
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100 | ! 0 = Centre ; 1 = corner W x(i-1/2) ; 2 = corner S y(j-1/2) ; |
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101 | ! 3 = corner SW x(i-1/2),y(j-1/2) |
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102 | !------------------- |
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103 | !!ibug ??? |
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104 | wght(:,:,:,:) = 0.e0 |
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105 | tmu(:,:) = 0.e0 |
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106 | #if defined key_lim2_vp |
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107 | akappa(:,:,:,:) = 0.e0 |
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108 | alambd(:,:,:,:,:,:) = 0.e0 |
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109 | #else |
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110 | tmv(:,:) = 0.e0 |
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111 | tmf(:,:) = 0.e0 |
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112 | #endif |
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113 | !!i |
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114 | |
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115 | #if defined key_lim2_vp |
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116 | ! metric coefficients for sea ice dynamic (VP rheology) |
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117 | !---------------------------------------- |
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118 | ! ! akappa |
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119 | DO jj = 2, jpj |
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120 | zd1d2(:,jj) = e1v(:,jj) - e1v(:,jj-1) |
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121 | END DO |
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122 | DO ji = 2, jpi |
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123 | zd2d1(ji,:) = e2u(ji,:) - e2u(ji-1,:) |
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124 | END DO |
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125 | CALL lbc_lnk( zd1d2, 'T', -1. ) ; CALL lbc_lnk( zd2d1, 'T', -1. ) ! lateral boundary condition |
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126 | ! |
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127 | akappa(:,:,1,1) = 1.0 / ( 2.0 * e1t(:,:) ) |
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128 | akappa(:,:,1,2) = zd1d2(:,:) / ( 4.0 * e1t(:,:) * e2t(:,:) ) |
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129 | akappa(:,:,2,1) = zd2d1(:,:) / ( 4.0 * e1t(:,:) * e2t(:,:) ) |
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130 | akappa(:,:,2,2) = 1.0 / ( 2.0 * e2t(:,:) ) |
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131 | |
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132 | ! |
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133 | DO jj = 2, jpj ! weights (wght) at I-points |
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134 | DO ji = 2, jpi |
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135 | zusden = 1. / ( ( e1t(ji,jj) + e1t(ji-1,jj ) ) & |
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136 | & * ( e2t(ji,jj) + e2t(ji ,jj-1) ) ) |
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137 | wght(ji,jj,1,1) = zusden * e1t(ji ,jj) * e2t(ji,jj ) |
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138 | wght(ji,jj,1,2) = zusden * e1t(ji ,jj) * e2t(ji,jj-1) |
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139 | wght(ji,jj,2,1) = zusden * e1t(ji-1,jj) * e2t(ji,jj ) |
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140 | wght(ji,jj,2,2) = zusden * e1t(ji-1,jj) * e2t(ji,jj-1) |
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141 | END DO |
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142 | END DO |
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143 | CALL lbc_lnk( wght(:,:,1,1), 'I', 1. ) ! CAUTION: even with the lbc_lnk at ice U-V-point |
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144 | CALL lbc_lnk( wght(:,:,1,2), 'I', 1. ) ! the value of wght at jpj is wrong |
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145 | CALL lbc_lnk( wght(:,:,2,1), 'I', 1. ) ! but it is never used |
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146 | CALL lbc_lnk( wght(:,:,2,2), 'I', 1. ) |
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147 | #else |
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148 | ! metric coefficients for sea ice dynamic (EVP rheology) |
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149 | !---------------------------------------- |
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150 | DO jj = 1, jpjm1 ! weights (wght) at F-points |
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151 | DO ji = 1, jpim1 |
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152 | zusden = 1. / ( ( e1t(ji+1,jj ) + e1t(ji,jj) ) & |
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153 | & * ( e2t(ji ,jj+1) + e2t(ji,jj) ) ) |
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154 | wght(ji,jj,1,1) = zusden * e1t(ji+1,jj) * e2t(ji,jj+1) |
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155 | wght(ji,jj,1,2) = zusden * e1t(ji+1,jj) * e2t(ji,jj ) |
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156 | wght(ji,jj,2,1) = zusden * e1t(ji ,jj) * e2t(ji,jj+1) |
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157 | wght(ji,jj,2,2) = zusden * e1t(ji ,jj) * e2t(ji,jj ) |
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158 | END DO |
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159 | END DO |
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160 | CALL lbc_lnk( wght(:,:,1,1), 'F', 1. ) ; CALL lbc_lnk( wght(:,:,1,2), 'F', 1. ) ! lateral boundary cond. |
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161 | CALL lbc_lnk( wght(:,:,2,1), 'F', 1. ) ; CALL lbc_lnk( wght(:,:,2,2), 'F', 1. ) |
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162 | #endif |
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163 | |
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164 | ! Coefficients for divergence of the stress tensor |
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165 | !------------------------------------------------- |
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166 | #if defined key_lim2_vp |
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167 | DO jj = 2, jpj ! VP rheology |
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168 | DO ji = 2, jpi ! NO vector opt. |
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169 | zh1p = e1t(ji ,jj ) * wght(ji,jj,2,2) + e1t(ji-1,jj ) * wght(ji,jj,1,2) & |
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170 | & + e1t(ji ,jj-1) * wght(ji,jj,2,1) + e1t(ji-1,jj-1) * wght(ji,jj,1,1) |
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171 | zh2p = e2t(ji ,jj ) * wght(ji,jj,2,2) + e2t(ji-1,jj ) * wght(ji,jj,1,2) & |
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172 | & + e2t(ji ,jj-1) * wght(ji,jj,2,1) + e2t(ji-1,jj-1) * wght(ji,jj,1,1) |
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173 | ! |
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174 | zusden = 1.e0 / MAX( zh1p * zh2p * 4.e0 , 1.e-20 ) |
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175 | zusden2 = zusden * 2.0 |
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176 | zd1d2p = zusden * 0.5 * ( -e1t(ji-1,jj-1) + e1t(ji-1,jj ) - e1t(ji,jj-1) + e1t(ji ,jj) ) |
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177 | zd2d1p = zusden * 0.5 * ( e2t(ji ,jj-1) - e2t(ji-1,jj-1) + e2t(ji,jj ) - e2t(ji-1,jj) ) |
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178 | ! |
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179 | alambd(ji,jj,2,2,2,1) = zusden2 * e2t(ji ,jj-1) |
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180 | alambd(ji,jj,2,2,2,2) = zusden2 * e2t(ji ,jj ) |
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181 | alambd(ji,jj,2,2,1,1) = zusden2 * e2t(ji-1,jj-1) |
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182 | alambd(ji,jj,2,2,1,2) = zusden2 * e2t(ji-1,jj ) |
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183 | ! |
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184 | alambd(ji,jj,1,1,2,1) = zusden2 * e1t(ji ,jj-1) |
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185 | alambd(ji,jj,1,1,2,2) = zusden2 * e1t(ji ,jj ) |
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186 | alambd(ji,jj,1,1,1,1) = zusden2 * e1t(ji-1,jj-1) |
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187 | alambd(ji,jj,1,1,1,2) = zusden2 * e1t(ji-1,jj ) |
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188 | ! |
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189 | alambd(ji,jj,1,2,2,1) = zd1d2p |
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190 | alambd(ji,jj,1,2,2,2) = zd1d2p |
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191 | alambd(ji,jj,1,2,1,1) = zd1d2p |
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192 | alambd(ji,jj,1,2,1,2) = zd1d2p |
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193 | ! |
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194 | alambd(ji,jj,2,1,2,1) = zd2d1p |
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195 | alambd(ji,jj,2,1,2,2) = zd2d1p |
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196 | alambd(ji,jj,2,1,1,1) = zd2d1p |
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197 | alambd(ji,jj,2,1,1,2) = zd2d1p |
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198 | END DO |
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199 | END DO |
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200 | ! |
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201 | ! lateral boundary conditions |
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202 | ! CAUTION: even with the lbc_lnk at ice U-V point, the value of wght at jpj is wrong but it is never used |
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203 | CALL lbc_lnk( alambd(:,:,2,2,1,1), 'I', 1. ) ; CALL lbc_lnk( alambd(:,:,2,2,2,1), 'I', 1. ) |
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204 | CALL lbc_lnk( alambd(:,:,2,2,1,2), 'I', 1. ) ; CALL lbc_lnk( alambd(:,:,2,2,2,2), 'I', 1. ) |
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205 | ! |
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206 | CALL lbc_lnk( alambd(:,:,1,1,2,2), 'I', 1. ) ; CALL lbc_lnk( alambd(:,:,1,1,2,1), 'I', 1. ) |
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207 | CALL lbc_lnk( alambd(:,:,1,1,1,1), 'I', 1. ) ; CALL lbc_lnk( alambd(:,:,1,1,1,2), 'I', 1. ) |
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208 | ! |
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209 | CALL lbc_lnk( alambd(:,:,1,2,1,1), 'I', 1. ) ; CALL lbc_lnk( alambd(:,:,1,2,2,1), 'I', 1. ) |
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210 | CALL lbc_lnk( alambd(:,:,1,2,1,2), 'I', 1. ) ; CALL lbc_lnk( alambd(:,:,1,2,2,2), 'I', 1. ) |
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211 | ! |
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212 | CALL lbc_lnk( alambd(:,:,2,1,1,1), 'I', 1. ) ; CALL lbc_lnk( alambd(:,:,2,1,2,2), 'I', 1. ) |
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213 | CALL lbc_lnk( alambd(:,:,2,1,1,2), 'I', 1. ) ; CALL lbc_lnk( alambd(:,:,2,1,2,1), 'I', 1. ) |
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214 | #endif |
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215 | |
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216 | |
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217 | ! Initialization of ice masks |
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218 | !---------------------------- |
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219 | ! |
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220 | tms(:,:) = tmask(:,:,1) ! ice T-point : use surface tmask |
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221 | ! |
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222 | #if defined key_lim2_vp |
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223 | ! VP rheology : ice velocity point is I-point |
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224 | tmu(:,1) = 0.e0 ! |
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225 | tmu(1,:) = 0.e0 |
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226 | DO jj = 2, jpj |
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227 | DO ji = 2, jpim1 ! NO vector opt. |
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228 | tmu(ji,jj) = tms(ji,jj) * tms(ji-1,jj) * tms(ji,jj-1) * tms(ji-1,jj-1) |
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229 | END DO |
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230 | END DO |
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231 | CALL lbc_lnk( tmu(:,:), 'I', 1. ) ! lateral boundary conditions |
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232 | #else |
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233 | ! EVP rheology : ice velocity point are U- & V-points ; ice vorticity point is F-point |
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234 | tmu(:,:) = umask(:,:,1) |
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235 | tmv(:,:) = vmask(:,:,1) |
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236 | tmf(:,:) = 0.e0 ! used of fmask except its special value along the coast (rn_shlat) |
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237 | WHERE( fmask(:,:,1) == 1.e0 ) tmf(:,:) = 1.e0 |
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238 | #endif |
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239 | ! |
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240 | area(:,:) = e1t(:,:) * e2t(:,:) ! unmasked and masked area of T-grid cell |
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241 | ! |
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242 | END SUBROUTINE lim_msh_2 |
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243 | |
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244 | #else |
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245 | !!---------------------------------------------------------------------- |
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246 | !! Default option Dummy Module NO LIM sea-ice model |
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247 | !!---------------------------------------------------------------------- |
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248 | CONTAINS |
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249 | SUBROUTINE lim_msh_2 ! Dummy routine |
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250 | END SUBROUTINE lim_msh_2 |
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251 | #endif |
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252 | |
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253 | !!====================================================================== |
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254 | END MODULE limmsh_2 |
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