1 | MODULE limmsh |
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2 | !!====================================================================== |
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3 | !! *** MODULE limmsh *** |
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4 | !! LIM ice model : definition of the ice mesh parameters |
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5 | !!====================================================================== |
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6 | #if defined key_ice_lim |
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7 | !!---------------------------------------------------------------------- |
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8 | !! 'key_ice_lim' LIM sea-ice model |
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9 | !!---------------------------------------------------------------------- |
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10 | !! lim_msh : definition of the ice mesh |
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11 | !!---------------------------------------------------------------------- |
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12 | !! * Modules used |
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13 | USE phycst |
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14 | USE dom_oce |
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15 | USE dom_ice |
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16 | USE lbclnk |
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17 | USE in_out_manager |
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18 | |
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19 | IMPLICIT NONE |
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20 | PRIVATE |
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21 | |
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22 | !! * Accessibility |
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23 | PUBLIC lim_msh ! routine called by ice_ini.F90 |
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24 | |
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25 | !!---------------------------------------------------------------------- |
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26 | !! LIM 2.0 , UCL-LODYC-IPSL (2003) |
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27 | !!---------------------------------------------------------------------- |
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28 | |
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29 | CONTAINS |
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30 | |
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31 | SUBROUTINE lim_msh |
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32 | !!------------------------------------------------------------------- |
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33 | !! *** ROUTINE lim_msh *** |
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34 | !! |
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35 | !! ** Purpose : Definition of the charact. of the numerical grid |
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36 | !! |
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37 | !! ** Action : - Initialisation of some variables |
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38 | !! - Definition of some constants linked with the grid |
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39 | !! - Definition of the metric coef. for the sea/ice |
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40 | !! - Initialization of the ice masks (tmsk, umsk) |
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41 | !! |
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42 | !! ** Refer. : Deleersnijder et al. Ocean Modelling 100, 7-10 |
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43 | !! |
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44 | !! ** History : |
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45 | !! original : 01-04 (LIM) |
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46 | !! addition : 02-08 (C. Ethe, G. Madec) |
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47 | !!--------------------------------------------------------------------- |
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48 | !! * Local variables |
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49 | INTEGER :: ji, jj ! dummy loop indices |
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50 | |
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51 | REAL(wp), DIMENSION(jpi,jpj) :: & |
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52 | zd2d1 , zd1d2 ! Derivative of zh2 (resp. zh1) in the x direction |
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53 | ! ! (resp. y direction) (defined at the center) |
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54 | REAL(wp) :: & |
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55 | zh1p , zh2p , & ! Idem zh1, zh2 for the bottom left corner of the grid |
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56 | zd2d1p, zd1d2p , & ! Idem zd2d1, zd1d2 for the bottom left corner of the grid |
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57 | zusden, zusden2 ! temporary scalars |
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58 | !!--------------------------------------------------------------------- |
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59 | |
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60 | IF(lwp) THEN |
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61 | WRITE(numout,*) |
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62 | WRITE(numout,*) 'lim_msh : LIM sea-ice model, mesh initialization' |
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63 | WRITE(numout,*) '~~~~~~~' |
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64 | ENDIF |
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65 | |
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66 | !---------------------------------------------------------- |
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67 | ! Initialization of local and some global (common) variables |
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68 | !------------------------------------------------------------------ |
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69 | |
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70 | njeq = INT( jpj / 2 ) !i bug mpp potentiel |
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71 | njeqm1 = njeq - 1 |
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72 | |
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73 | fcor(:,:) = 2. * omega * SIN( gphit(:,:) * rad ) ! coriolis factor |
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74 | |
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75 | !i DO jj = 1, jpj |
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76 | !i zmsk(jj) = SUM( tmask(:,jj,:) ) ! = 0 if land everywhere on a j-line |
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77 | !!ii write(numout,*) jj, zind(jj) |
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78 | !i END DO |
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79 | |
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80 | IF( fcor(1,1) * fcor(1,nlcj) < 0.e0 ) THEN ! local domain include both hemisphere |
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81 | l_jeq = .TRUE. |
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82 | njeq = 1 |
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83 | DO WHILE ( njeq <= jpj .AND. fcor(1,njeq) < 0.e0 ) |
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84 | njeq = njeq + 1 |
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85 | END DO |
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86 | IF(lwp ) WRITE(numout,*) ' the equator is inside the domain at about njeq = ', njeq |
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87 | ELSEIF( fcor(1,1) < 0.e0 ) THEN |
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88 | l_jeq = .FALSE. |
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89 | njeq = jpj + 10 |
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90 | IF(lwp ) WRITE(numout,*) ' the model domain is entirely in the southern hemisphere: njeq = ', njeq |
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91 | ELSE |
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92 | l_jeq = .FALSE. |
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93 | njeq = -10 |
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94 | IF(lwp ) WRITE(numout,*) ' the model domain is entirely in the northern hemisphere: njeq = ', njeq |
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95 | ENDIF |
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96 | |
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97 | njeqm1 = njeq - 1 |
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98 | |
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99 | |
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100 | ! For each grid, definition of geometric tables |
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101 | !------------------------------------------------------------------ |
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102 | |
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103 | !------------------- |
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104 | ! Conventions : ! |
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105 | !------------------- |
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106 | ! indices 1 \ 2 <-> localisation in the 2 direction x \ y |
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107 | ! 3rd indice <-> localisation on the mesh : |
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108 | ! 0 = Centre ; 1 = corner W x(i-1/2) ; 2 = corner S y(j-1/2) ; |
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109 | ! 3 = corner SW x(i-1/2),y(j-1/2) |
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110 | !------------------- |
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111 | !!ibug ??? |
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112 | akappa(:,:,:,:) = 0.e0 |
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113 | wght(:,:,:,:) = 0.e0 |
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114 | alambd(:,:,:,:,:,:) = 0.e0 |
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115 | tmu(:,:) = 0.e0 |
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116 | !!i |
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117 | |
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118 | |
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119 | ! metric coefficients for sea ice dynamic |
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120 | !---------------------------------------- |
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121 | ! ! akappa |
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122 | DO jj = 2, jpj |
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123 | zd1d2(:,jj) = e1v(:,jj) - e1v(:,jj-1) |
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124 | END DO |
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125 | CALL lbc_lnk( zd1d2, 'T', -1. ) |
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126 | |
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127 | DO ji = 2, jpi |
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128 | zd2d1(ji,:) = e2u(ji,:) - e2u(ji-1,:) |
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129 | END DO |
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130 | CALL lbc_lnk( zd2d1, 'T', -1. ) |
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131 | |
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132 | akappa(:,:,1,1) = 1.0 / ( 2.0 * e1t(:,:) ) |
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133 | akappa(:,:,1,2) = zd1d2(:,:) / ( 4.0 * e1t(:,:) * e2t(:,:) ) |
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134 | akappa(:,:,2,1) = zd2d1(:,:) / ( 4.0 * e1t(:,:) * e2t(:,:) ) |
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135 | akappa(:,:,2,2) = 1.0 / ( 2.0 * e2t(:,:) ) |
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136 | |
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137 | ! ! weights (wght) |
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138 | DO jj = 2, jpj |
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139 | DO ji = 2, jpi |
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140 | zusden = 1. / ( ( e1t(ji,jj) + e1t(ji-1,jj ) ) & |
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141 | & * ( e2t(ji,jj) + e2t(ji ,jj-1) ) ) |
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142 | wght(ji,jj,1,1) = zusden * e1t(ji ,jj) * e2t(ji,jj ) |
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143 | wght(ji,jj,1,2) = zusden * e1t(ji ,jj) * e2t(ji,jj-1) |
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144 | wght(ji,jj,2,1) = zusden * e1t(ji-1,jj) * e2t(ji,jj ) |
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145 | wght(ji,jj,2,2) = zusden * e1t(ji-1,jj) * e2t(ji,jj-1) |
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146 | END DO |
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147 | END DO |
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148 | CALL lbc_lnk( wght(:,:,1,1), 'I', 1. ) ! CAUTION: even with the lbc_lnk at ice U-V-point |
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149 | CALL lbc_lnk( wght(:,:,1,2), 'I', 1. ) ! the value of wght at jpj is wrong |
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150 | CALL lbc_lnk( wght(:,:,2,1), 'I', 1. ) ! but it is never used |
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151 | CALL lbc_lnk( wght(:,:,2,2), 'I', 1. ) |
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152 | |
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153 | ! Coefficients for divergence of the stress tensor |
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154 | !------------------------------------------------- |
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155 | |
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156 | DO jj = 2, jpj |
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157 | DO ji = 2, jpi |
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158 | zh1p = e1t(ji ,jj ) * wght(ji,jj,2,2) & |
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159 | & + e1t(ji-1,jj ) * wght(ji,jj,1,2) & |
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160 | & + e1t(ji ,jj-1) * wght(ji,jj,2,1) & |
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161 | & + e1t(ji-1,jj-1) * wght(ji,jj,1,1) |
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162 | |
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163 | zh2p = e2t(ji ,jj ) * wght(ji,jj,2,2) & |
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164 | & + e2t(ji-1,jj ) * wght(ji,jj,1,2) & |
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165 | & + e2t(ji ,jj-1) * wght(ji,jj,2,1) & |
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166 | & + e2t(ji-1,jj-1) * wght(ji,jj,1,1) |
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167 | |
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168 | ! better written but change the last digit and thus solver in less than 100 timestep |
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169 | ! zh1p = e1t(ji-1,jj ) * wght(ji,jj,1,2) + e1t(ji,jj ) * wght(ji,jj,2,2) & |
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170 | ! & + e1t(ji-1,jj-1) * wght(ji,jj,1,1) + e1t(ji,jj-1) * wght(ji,jj,2,1) |
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171 | |
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172 | ! zh2p = e2t(ji-1,jj ) * wght(ji,jj,1,2) + e2t(ji,jj ) * wght(ji,jj,2,2) & |
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173 | ! & + e2t(ji-1,jj-1) * wght(ji,jj,1,1) + e2t(ji,jj-1) * wght(ji,jj,2,1) |
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174 | |
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175 | !!ibug =0 zusden = 1.0 / ( zh1p * zh2p * 4.e0 ) |
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176 | zusden = 1.0 / MAX( zh1p * zh2p * 4.e0 , 1.e-20 ) |
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177 | zusden2 = zusden * 2.0 |
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178 | |
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179 | zd1d2p = zusden * 0.5 * ( -e1t(ji-1,jj-1) + e1t(ji-1,jj ) - e1t(ji,jj-1) + e1t(ji ,jj) ) |
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180 | zd2d1p = zusden * 0.5 * ( e2t(ji ,jj-1) - e2t(ji-1,jj-1) + e2t(ji,jj ) - e2t(ji-1,jj) ) |
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181 | |
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182 | alambd(ji,jj,2,2,2,1) = zusden2 * e2t(ji ,jj-1) |
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183 | alambd(ji,jj,2,2,2,2) = zusden2 * e2t(ji ,jj ) |
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184 | alambd(ji,jj,2,2,1,1) = zusden2 * e2t(ji-1,jj-1) |
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185 | alambd(ji,jj,2,2,1,2) = zusden2 * e2t(ji-1,jj ) |
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186 | |
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187 | alambd(ji,jj,1,1,2,1) = zusden2 * e1t(ji ,jj-1) |
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188 | alambd(ji,jj,1,1,2,2) = zusden2 * e1t(ji ,jj ) |
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189 | alambd(ji,jj,1,1,1,1) = zusden2 * e1t(ji-1,jj-1) |
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190 | alambd(ji,jj,1,1,1,2) = zusden2 * e1t(ji-1,jj ) |
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191 | |
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192 | alambd(ji,jj,1,2,2,1) = zd1d2p |
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193 | alambd(ji,jj,1,2,2,2) = zd1d2p |
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194 | alambd(ji,jj,1,2,1,1) = zd1d2p |
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195 | alambd(ji,jj,1,2,1,2) = zd1d2p |
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196 | |
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197 | alambd(ji,jj,2,1,2,1) = zd2d1p |
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198 | alambd(ji,jj,2,1,2,2) = zd2d1p |
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199 | alambd(ji,jj,2,1,1,1) = zd2d1p |
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200 | alambd(ji,jj,2,1,1,2) = zd2d1p |
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201 | END DO |
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202 | END DO |
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203 | |
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204 | CALL lbc_lnk( alambd(:,:,2,2,2,1), 'I', 1. ) ! CAUTION: even with the lbc_lnk at ice U-V point |
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205 | CALL lbc_lnk( alambd(:,:,2,2,2,2), 'I', 1. ) ! the value of wght at jpj is wrong |
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206 | CALL lbc_lnk( alambd(:,:,2,2,1,1), 'I', 1. ) ! but it is never used |
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207 | CALL lbc_lnk( alambd(:,:,2,2,1,2), 'I', 1. ) ! |
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208 | |
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209 | CALL lbc_lnk( alambd(:,:,1,1,2,1), 'I', 1. ) ! CAUTION: idem |
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210 | CALL lbc_lnk( alambd(:,:,1,1,2,2), 'I', 1. ) ! |
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211 | CALL lbc_lnk( alambd(:,:,1,1,1,1), 'I', 1. ) ! |
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212 | CALL lbc_lnk( alambd(:,:,1,1,1,2), 'I', 1. ) ! |
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213 | |
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214 | CALL lbc_lnk( alambd(:,:,1,2,2,1), 'I', 1. ) ! CAUTION: idem |
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215 | CALL lbc_lnk( alambd(:,:,1,2,2,2), 'I', 1. ) ! |
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216 | CALL lbc_lnk( alambd(:,:,1,2,1,1), 'I', 1. ) ! |
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217 | CALL lbc_lnk( alambd(:,:,1,2,1,2), 'I', 1. ) ! |
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218 | |
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219 | CALL lbc_lnk( alambd(:,:,2,1,2,1), 'I', 1. ) ! CAUTION: idem |
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220 | CALL lbc_lnk( alambd(:,:,2,1,2,2), 'I', 1. ) ! |
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221 | CALL lbc_lnk( alambd(:,:,2,1,1,1), 'I', 1. ) ! |
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222 | CALL lbc_lnk( alambd(:,:,2,1,1,2), 'I', 1. ) ! |
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223 | |
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224 | |
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225 | ! Initialization of ice masks |
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226 | !---------------------------- |
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227 | |
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228 | tms(:,:) = tmask(:,:,1) ! ice T-point : use surface tmask |
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229 | |
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230 | !i here we can use umask with a i and j shift of -1,-1 |
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231 | tmu(:,1) = 0.e0 |
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232 | tmu(1,:) = 0.e0 |
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233 | DO jj = 2, jpj ! ice U.V-point: computed from ice T-point mask |
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234 | DO ji = 2, jpim1 |
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235 | tmu(ji,jj) = tms(ji,jj) * tms(ji-1,jj) * tms(ji,jj-1) * tms(ji-1,jj-1) |
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236 | END DO |
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237 | END DO |
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238 | |
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239 | !--lateral boundary conditions |
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240 | CALL lbc_lnk( tmu(:,:), 'I', 1. ) |
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241 | |
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242 | ! unmasked and masked area of T-grid cell |
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243 | area(:,:) = e1t(:,:) * e2t(:,:) |
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244 | |
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245 | END SUBROUTINE lim_msh |
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246 | |
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247 | #else |
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248 | !!---------------------------------------------------------------------- |
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249 | !! Default option Dummy Module NO LIM sea-ice model |
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250 | !!---------------------------------------------------------------------- |
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251 | CONTAINS |
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252 | SUBROUTINE lim_msh ! Dummy routine |
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253 | END SUBROUTINE lim_msh |
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254 | #endif |
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255 | |
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256 | !!====================================================================== |
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257 | END MODULE limmsh |
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