1 | MODULE limistate |
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2 | !!====================================================================== |
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3 | !! *** MODULE limistate *** |
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4 | !! Initialisation of diagnostics ice variables |
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5 | !!====================================================================== |
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6 | !! History : 2.0 ! 01-04 (C. Ethe, G. Madec) Original code |
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7 | !! ! 04-04 (S. Theetten) initialization from a file |
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8 | !! ! 06-07 (S. Masson) IOM to read the restart |
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9 | !!-------------------------------------------------------------------- |
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10 | #if defined key_ice_lim |
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11 | !!---------------------------------------------------------------------- |
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12 | !! 'key_ice_lim' : LIM sea-ice model |
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13 | !!---------------------------------------------------------------------- |
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14 | !!---------------------------------------------------------------------- |
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15 | !! lim_istate : Initialisation of diagnostics ice variables |
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16 | !! lim_istate_init : initialization of ice state and namelist read |
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17 | !!---------------------------------------------------------------------- |
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18 | USE phycst |
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19 | USE ocfzpt |
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20 | USE oce ! dynamics and tracers variables !!gm used??? |
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21 | USE dom_oce !!gm used??? |
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22 | USE par_ice ! ice parameters |
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23 | USE ice_oce ! ice variables |
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24 | USE dom_ice |
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25 | USE ice ! ??? |
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26 | USE lbclnk |
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27 | USE ice |
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28 | USE iom |
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29 | USE in_out_manager |
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30 | |
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31 | IMPLICIT NONE |
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32 | PRIVATE |
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33 | |
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34 | PUBLIC lim_istate ! routine called by lim_init.F90 |
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35 | |
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36 | REAL(wp) :: & !!! ** init namelist (namiceini) ** |
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37 | ttest = 2.0 , & ! threshold water temperature for initial sea ice |
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38 | hninn = 0.5 , & ! initial snow thickness in the north |
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39 | hginn = 3.0 , & ! initial ice thickness in the north |
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40 | alinn = 0.05 , & ! initial leads area in the north |
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41 | hnins = 0.1 , & ! initial snow thickness in the south |
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42 | hgins = 1.0 , & ! initial ice thickness in the south |
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43 | alins = 0.1 ! initial leads area in the south |
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44 | |
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45 | REAL(wp) :: & ! constant values |
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46 | zzero = 0.e0 , & |
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47 | zone = 1.e0 |
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48 | !!---------------------------------------------------------------------- |
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49 | !! LIM 2.0, UCL-LOCEAN-IPSL (2006) |
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50 | !! $Header$ |
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51 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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52 | !!---------------------------------------------------------------------- |
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53 | |
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54 | CONTAINS |
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55 | |
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56 | SUBROUTINE lim_istate |
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57 | !!------------------------------------------------------------------- |
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58 | !! *** ROUTINE lim_istate *** |
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59 | !! |
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60 | !! ** Purpose : defined the sea-ice initial state |
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61 | !! |
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62 | !! ** Method : restart from a state defined in a binary file |
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63 | !! or from arbitrary sea-ice conditions |
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64 | !!-------------------------------------------------------------------- |
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65 | INTEGER :: ji, jj, jk ! dummy loop indices |
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66 | REAL(wp) :: zidto, zs0, ztf, zbin ! temporary scalar |
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67 | REAL(wp), DIMENSION(jpi,jpj) :: ztn ! workspace |
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68 | !-------------------------------------------------------------------- |
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69 | |
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70 | CALL lim_istate_init ! reading the initials parameters of the ice |
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71 | |
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72 | !-- Initialisation of sst,sss,u,v do i=1,jpi |
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73 | u_io(:,:) = 0.e0 ! ice velocity in x direction |
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74 | v_io(:,:) = 0.e0 ! ice velocity in y direction |
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75 | |
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76 | IF( ln_limini ) THEN ! |
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77 | |
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78 | ! Initialisation at tn if no ice or sst_ini if ice |
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79 | ! Idem for salinity |
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80 | |
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81 | !--- Criterion for presence (zidto=1.) or absence (zidto=0.) of ice |
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82 | DO jj = 1 , jpj |
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83 | DO ji = 1 , jpi |
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84 | |
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85 | zidto = MAX(zzero, - SIGN(1.,frld(ji,jj) - 1.)) |
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86 | |
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87 | sst_io(ji,jj) = ( nfice - 1 ) * (zidto * sst_ini(ji,jj) + & ! use the ocean initial values |
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88 | & (1.0 - zidto ) * ( tn(ji,jj,1) + rt0 )) ! tricky trick *(nfice-1) ! |
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89 | sss_io(ji,jj) = ( nfice - 1 ) * (zidto * sss_ini(ji,jj) + & |
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90 | & (1.0 - zidto ) * sn(ji,jj,1) ) |
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91 | |
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92 | ! to avoid the the melting of ice, several layers (mixed layer) should be |
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93 | ! set to sst_ini (sss_ini) if there is ice |
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94 | ! example for one layer |
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95 | ! tn(ji,jj,1) = zidto * ( sst_ini(ji,jj) - rt0 ) + (1.0 - zidto ) * tn(ji,jj,1) |
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96 | ! sn(ji,jj,1) = zidto * sss_ini(ji,jj) + (1.0 - zidto ) * sn(ji,jj,1) |
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97 | ! tb(ji,jj,1) = tn(ji,jj,1) |
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98 | ! sb(ji,jj,1) = sn(ji,jj,1) |
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99 | END DO |
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100 | END DO |
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101 | |
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102 | |
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103 | ! tfu: Melting point of sea water |
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104 | tfu(:,:) = ztf |
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105 | |
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106 | tfu(:,:) = ABS ( rt0 - 0.0575 * sss_ini(:,:) & |
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107 | & + 1.710523e-03 * sss_ini(:,:) * SQRT( sss_ini(:,:) ) & |
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108 | & - 2.154996e-04 * sss_ini(:,:) * sss_ini(:,:) ) |
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109 | ELSE ! |
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110 | |
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111 | |
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112 | ! Initialisation at tn or -2 if ice |
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113 | DO jj = 1, jpj |
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114 | DO ji = 1, jpi |
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115 | zbin = MAX( 0., SIGN( 1., fzptn(ji,jj) - tn(ji,jj,1) ) ) |
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116 | ztn(ji,jj) = ( (1.-zbin) * tn(ji,jj,1) - 2. * zbin + rt0 ) * tmask(ji,jj,1) |
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117 | END DO |
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118 | END DO |
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119 | |
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120 | u_io (:,:) = 0.e0 |
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121 | v_io (:,:) = 0.e0 |
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122 | sst_io(:,:) = ( nfice - 1 ) * ( tn(:,:,1) + rt0 ) ! use the ocean initial values |
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123 | sss_io(:,:) = ( nfice - 1 ) * sn(:,:,1) ! tricky trick *(nfice-1) ! |
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124 | |
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125 | ! reference salinity 34psu |
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126 | zs0 = 34.e0 |
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127 | ztf = ABS ( rt0 - 0.0575 * zs0 & |
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128 | & + 1.710523e-03 * zs0 * SQRT( zs0 ) & |
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129 | & - 2.154996e-04 * zs0 *zs0 ) |
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130 | |
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131 | ! tfu: Melting point of sea water |
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132 | tfu(:,:) = ztf |
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133 | |
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134 | DO jj = 1, jpj |
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135 | DO ji = 1, jpi |
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136 | !--- Criterion for presence (zidto=1) or absence (zidto=0) of ice |
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137 | zidto = tms(ji,jj) * ( 1.0 - MAX(zzero, SIGN( zone, ztn(ji,jj) - tfu(ji,jj) - ttest) ) ) |
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138 | |
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139 | IF( fcor(ji,jj) >= 0.e0 ) THEN !-- Northern hemisphere. |
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140 | hicif(ji,jj) = zidto * hginn |
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141 | frld(ji,jj) = zidto * alinn + ( 1.0 - zidto ) * 1.0 |
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142 | hsnif(ji,jj) = zidto * hninn |
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143 | ELSE !--- Southern hemisphere. |
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144 | hicif(ji,jj) = zidto * hgins |
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145 | frld(ji,jj) = zidto * alins + ( 1.0 - zidto ) * 1.0 |
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146 | hsnif(ji,jj) = zidto * hnins |
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147 | ENDIF |
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148 | END DO |
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149 | END DO |
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150 | |
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151 | sist (:,:) = tfu(:,:) |
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152 | tbif (:,:,1) = tfu(:,:) |
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153 | tbif (:,:,2) = tfu(:,:) |
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154 | tbif (:,:,3) = tfu(:,:) |
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155 | |
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156 | ENDIF |
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157 | fsbbq (:,:) = 0.e0 |
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158 | qstoif(:,:) = 0.e0 |
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159 | u_ice (:,:) = 0.e0 |
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160 | v_ice (:,:) = 0.e0 |
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161 | # if defined key_coupled |
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162 | albege(:,:) = 0.8 * tms(:,:) |
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163 | # endif |
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164 | |
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165 | !--- Moments for advection. |
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166 | |
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167 | sxice (:,:) = 0.e0 ; sxsn (:,:) = 0.e0 ; sxa (:,:) = 0.e0 |
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168 | syice (:,:) = 0.e0 ; sysn (:,:) = 0.e0 ; sya (:,:) = 0.e0 |
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169 | sxxice(:,:) = 0.e0 ; sxxsn(:,:) = 0.e0 ; sxxa (:,:) = 0.e0 |
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170 | syyice(:,:) = 0.e0 ; syysn(:,:) = 0.e0 ; syya (:,:) = 0.e0 |
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171 | sxyice(:,:) = 0.e0 ; sxysn(:,:) = 0.e0 ; sxya (:,:) = 0.e0 |
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172 | |
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173 | sxc0 (:,:) = 0.e0 ; sxc1 (:,:) = 0.e0 ; sxc2 (:,:) = 0.e0 |
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174 | syc0 (:,:) = 0.e0 ; syc1 (:,:) = 0.e0 ; syc2 (:,:) = 0.e0 |
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175 | sxxc0 (:,:) = 0.e0 ; sxxc1(:,:) = 0.e0 ; sxxc2(:,:) = 0.e0 |
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176 | syyc0 (:,:) = 0.e0 ; syyc1(:,:) = 0.e0 ; syyc2(:,:) = 0.e0 |
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177 | sxyc0 (:,:) = 0.e0 ; sxyc1(:,:) = 0.e0 ; sxyc2(:,:) = 0.e0 |
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178 | |
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179 | sxst (:,:) = 0.e0 |
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180 | syst (:,:) = 0.e0 |
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181 | sxxst (:,:) = 0.e0 |
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182 | syyst (:,:) = 0.e0 |
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183 | sxyst (:,:) = 0.e0 |
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184 | |
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185 | !-- lateral boundary conditions |
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186 | CALL lbc_lnk( hicif, 'T', 1. ) |
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187 | CALL lbc_lnk( frld , 'T', 1. ) |
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188 | |
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189 | ! C A U T I O N frld = 1 over land and lbc_lnk put zero along |
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190 | ! ************* closed boundaries herefore we force to one over land |
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191 | frld(:,:) = tms(:,:) * frld(:,:) + ( 1. - tms(:,:) ) |
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192 | |
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193 | CALL lbc_lnk( hsnif, 'T', 1. ) |
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194 | CALL lbc_lnk( sist , 'T', 1. ) |
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195 | DO jk = 1, jplayersp1 |
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196 | CALL lbc_lnk(tbif(:,:,jk), 'T', 1. ) |
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197 | END DO |
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198 | CALL lbc_lnk( fsbbq , 'T', 1. ) |
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199 | CALL lbc_lnk( qstoif , 'T', 1. ) |
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200 | CALL lbc_lnk( sss_io , 'T', 1. ) |
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201 | ! |
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202 | END SUBROUTINE lim_istate |
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203 | |
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204 | |
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205 | SUBROUTINE lim_istate_init |
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206 | !!------------------------------------------------------------------- |
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207 | !! *** ROUTINE lim_istate_init *** |
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208 | !! |
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209 | !! ** Purpose : Definition of initial state of the ice |
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210 | !! |
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211 | !! ** Method : Read the namiceini namelist and check the parameter |
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212 | !! values called at the first timestep (nit000) |
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213 | !! or |
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214 | !! Read 7 variables from a previous restart file |
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215 | !! sst, sst, hicif, hsnif, frld, ts & tbif |
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216 | !! |
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217 | !! ** input : Namelist namiceini |
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218 | !!------------------------------------------------------------------- |
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219 | INTEGER :: inum_ice |
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220 | |
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221 | NAMELIST/namiceini/ ln_limini, ln_limdmp, ttest, hninn, hginn, alinn, & |
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222 | & hnins, hgins, alins |
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223 | !!------------------------------------------------------------------- |
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224 | |
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225 | ! Read Namelist namiceini |
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226 | REWIND ( numnam_ice ) |
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227 | READ ( numnam_ice , namiceini ) |
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228 | |
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229 | IF(.NOT. ln_limini) THEN |
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230 | IF(lwp) THEN |
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231 | WRITE(numout,*) |
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232 | WRITE(numout,*) 'lim_istate_init : ice parameters inititialisation ' |
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233 | WRITE(numout,*) '~~~~~~~~~~~~~~~' |
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234 | WRITE(numout,*) ' threshold water temp. for initial sea-ice ttest = ', ttest |
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235 | WRITE(numout,*) ' initial snow thickness in the north hninn = ', hninn |
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236 | WRITE(numout,*) ' initial ice thickness in the north hginn = ', hginn |
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237 | WRITE(numout,*) ' initial leads area in the north alinn = ', alinn |
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238 | WRITE(numout,*) ' initial snow thickness in the south hnins = ', hnins |
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239 | WRITE(numout,*) ' initial ice thickness in the south hgins = ', hgins |
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240 | WRITE(numout,*) ' initial leads area in the south alins = ', alins |
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241 | ENDIF |
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242 | ENDIF |
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243 | |
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244 | IF( ln_limini ) THEN ! Ice initialization using input file |
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245 | |
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246 | CALL iom_open( 'Ice_initialization.nc', inum_ice ) |
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247 | |
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248 | IF( inum_ice > 0 ) THEN |
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249 | IF(lwp) THEN |
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250 | WRITE(numout,*) ' ' |
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251 | WRITE(numout,*) 'lim_istate_init : ice state initialization with : Ice_initialization.nc' |
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252 | WRITE(numout,*) '~~~~~~~~~~~~~~~' |
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253 | WRITE(numout,*) ' Ice state initialization using input file ln_limini = ', ln_limini |
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254 | WRITE(numout,*) ' Ice damping ln_limdmp = ', ln_limdmp |
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255 | WRITE(numout,*) ' ' |
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256 | ENDIF |
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257 | |
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258 | CALL iom_get( inum_ice, jpdom_data, 'sst' , sst_ini(:,:) ) |
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259 | CALL iom_get( inum_ice, jpdom_data, 'sss' , sss_ini(:,:) ) |
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260 | CALL iom_get( inum_ice, jpdom_data, 'hicif', hicif (:,:) ) |
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261 | CALL iom_get( inum_ice, jpdom_data, 'hsnif', hsnif (:,:) ) |
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262 | CALL iom_get( inum_ice, jpdom_data, 'frld' , frld (:,:) ) |
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263 | CALL iom_get( inum_ice, jpdom_data, 'ts' , sist (:,:) ) |
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264 | CALL iom_get( inum_ice, jpdom_unknown, 'tbif', tbif(:,:,:), & |
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265 | & kstart = (/ mig(1),mjg(1),1 /), kcount = (/ nlci,nlcj,jplayersp1 /) ) |
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266 | |
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267 | CALL iom_close( inum_ice) |
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268 | |
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269 | ENDIF |
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270 | ENDIF |
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271 | ! |
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272 | END SUBROUTINE lim_istate_init |
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273 | |
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274 | #else |
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275 | !!---------------------------------------------------------------------- |
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276 | !! Default option : Empty module NO LIM sea-ice model |
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277 | !!---------------------------------------------------------------------- |
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278 | CONTAINS |
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279 | SUBROUTINE lim_istate ! Empty routine |
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280 | END SUBROUTINE lim_istate |
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281 | #endif |
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282 | |
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283 | !!====================================================================== |
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284 | END MODULE limistate |
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