1 | MODULE icedyn |
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2 | !!====================================================================== |
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3 | !! *** MODULE icedyn *** |
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4 | !! Sea-Ice dynamics : |
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5 | !!====================================================================== |
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6 | !! history : 4.0 ! 2017-09 (C. Rousset) original code |
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7 | !!---------------------------------------------------------------------- |
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8 | #if defined key_lim3 |
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9 | !!---------------------------------------------------------------------- |
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10 | !! 'key_lim3' LIM3 sea-ice model |
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11 | !!---------------------------------------------------------------------- |
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12 | !! ice_dyn : dynamics of sea ice |
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13 | !! ice_dyn_init : initialisation of sea-ice dynamics |
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14 | !!---------------------------------------------------------------------- |
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15 | USE phycst ! physical constants |
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16 | USE dom_oce ! ocean space and time domain |
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17 | USE ice ! sea-ice: variables |
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18 | USE icerhg ! sea-ice: rheology |
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19 | USE iceadv ! sea-ice: advection |
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20 | USE icerdgrft ! sea-ice: ridging/rafting |
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21 | USE icecor ! sea-ice: corrections |
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22 | USE icevar ! sea-ice: operations |
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23 | ! |
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24 | USE lbclnk ! lateral boundary conditions - MPP exchanges |
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25 | USE lib_mpp ! MPP library |
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26 | USE in_out_manager ! I/O manager |
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27 | USE lib_fortran ! glob_sum |
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28 | USE timing ! Timing |
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29 | |
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30 | IMPLICIT NONE |
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31 | PRIVATE |
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32 | |
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33 | PUBLIC ice_dyn ! called by icestp.F90 |
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34 | PUBLIC ice_dyn_init ! called by icestp.F90 |
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35 | |
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36 | INTEGER :: nice_dyn ! choice of the type of advection scheme |
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37 | ! ! associated indices: |
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38 | INTEGER, PARAMETER :: np_dynNO = 0 ! no ice dynamics and ice advection |
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39 | INTEGER, PARAMETER :: np_dynFULL = 1 ! full ice dynamics (rheology + advection + ridging/rafting + correction) |
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40 | INTEGER, PARAMETER :: np_dyn = 2 ! no ridging/rafting (rheology + advection + correction) |
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41 | INTEGER, PARAMETER :: np_dynPURE = 3 ! pure dynamics (rheology + advection) |
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42 | |
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43 | !! * Substitutions |
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44 | # include "vectopt_loop_substitute.h90" |
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45 | !!---------------------------------------------------------------------- |
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46 | !! NEMO/ICE 4.0 , NEMO Consortium (2017) |
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47 | !! $Id: icedyn.F90 8378 2017-07-26 13:55:59Z clem $ |
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48 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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49 | !!---------------------------------------------------------------------- |
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50 | CONTAINS |
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51 | |
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52 | SUBROUTINE ice_dyn( kt ) |
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53 | !!------------------------------------------------------------------- |
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54 | !! *** ROUTINE ice_dyn *** |
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55 | !! |
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56 | !! ** Purpose : this routine manages sea ice dynamics |
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57 | !! |
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58 | !! ** Action : - Initialisation of some variables |
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59 | !! - call ice_rhg |
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60 | !!-------------------------------------------------------------------- |
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61 | INTEGER, INTENT(in) :: kt ! ice time step |
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62 | !! |
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63 | INTEGER :: jl ! dummy loop indices |
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64 | !!-------------------------------------------------------------------- |
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65 | ! |
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66 | IF( nn_timing == 1 ) CALL timing_start('icedyn') |
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67 | ! |
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68 | IF( kt == nit000 .AND. lwp ) THEN |
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69 | WRITE(numout,*) |
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70 | WRITE(numout,*)'ice_dyn: sea-ice dynamics' |
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71 | WRITE(numout,*)'~~~~~~~' |
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72 | ENDIF |
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73 | |
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74 | CALL ice_var_agg(1) ! -- aggregate ice categories |
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75 | ! |
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76 | IF( ln_landfast ) THEN ! -- Landfast ice parameterization: define max bottom friction |
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77 | tau_icebfr(:,:) = 0._wp |
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78 | DO jl = 1, jpl |
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79 | WHERE( ht_i(:,:,jl) > ht_n(:,:) * rn_gamma ) tau_icebfr(:,:) = tau_icebfr(:,:) + a_i(:,:,jl) * rn_icebfr |
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80 | END DO |
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81 | ENDIF |
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82 | |
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83 | SELECT CASE( nice_dyn ) ! -- Set which dynamics is running |
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84 | |
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85 | CASE ( np_dynFULL ) !== all dynamical processes ==! |
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86 | CALL ice_rhg ( kt ) ! -- rheology |
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87 | CALL ice_adv ( kt ) ! -- advection of ice |
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88 | CALL ice_rdgrft( kt ) ! -- ridging/rafting |
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89 | CALL ice_cor ( kt , 1 ) ! -- Corrections |
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90 | |
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91 | CASE ( np_dyn ) !== pure dynamics only ==! (no ridging/rafting) (nono cat. case 2) |
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92 | CALL ice_rhg ( kt ) ! -- rheology |
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93 | CALL ice_adv ( kt ) ! -- advection of ice |
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94 | CALL ice_cor ( kt , 1 ) ! -- Corrections |
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95 | |
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96 | CASE ( np_dynPURE ) !== pure dynamics only ==! (nn_icedyn= 1 ) |
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97 | CALL ice_rhg ( kt ) ! -- rheology |
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98 | CALL ice_adv ( kt ) ! -- advection of ice |
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99 | |
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100 | CASE ( np_dynNO ) !== prescribed ice velocities ==! (nn_icedyn= 0 ) |
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101 | u_ice(:,:) = rn_uice * umask(:,:,1) |
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102 | v_ice(:,:) = rn_vice * vmask(:,:,1) |
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103 | !!CALL RANDOM_NUMBER(u_ice(:,:)) |
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104 | !!CALL RANDOM_NUMBER(v_ice(:,:)) |
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105 | |
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106 | END SELECT |
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107 | ! |
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108 | IF( nn_timing == 1 ) CALL timing_stop('icedyn') |
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109 | ! |
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110 | END SUBROUTINE ice_dyn |
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111 | |
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112 | |
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113 | SUBROUTINE ice_dyn_init |
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114 | !!------------------------------------------------------------------- |
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115 | !! *** ROUTINE ice_dyn_init *** |
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116 | !! |
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117 | !! ** Purpose : Physical constants and parameters linked to the ice |
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118 | !! dynamics |
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119 | !! |
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120 | !! ** Method : Read the namice_dyn namelist and check the ice-dynamic |
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121 | !! parameter values called at the first timestep (nit000) |
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122 | !! |
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123 | !! ** input : Namelist namice_dyn |
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124 | !!------------------------------------------------------------------- |
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125 | INTEGER :: ios ! Local integer output status for namelist read |
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126 | !! |
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127 | NAMELIST/namice_dyn/ ln_icedyn , nn_icedyn, rn_uice , rn_vice , & |
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128 | & rn_ishlat , rn_cio , & |
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129 | & ln_landfast, rn_gamma , rn_icebfr, rn_lfrelax |
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130 | !!------------------------------------------------------------------- |
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131 | ! |
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132 | REWIND( numnam_ice_ref ) ! Namelist namice_dyn in reference namelist : Ice dynamics |
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133 | READ ( numnam_ice_ref, namice_dyn, IOSTAT = ios, ERR = 901) |
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134 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namice_dyn in reference namelist', lwp ) |
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135 | ! |
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136 | REWIND( numnam_ice_cfg ) ! Namelist namice_dyn in configuration namelist : Ice dynamics |
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137 | READ ( numnam_ice_cfg, namice_dyn, IOSTAT = ios, ERR = 902 ) |
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138 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namice_dyn in configuration namelist', lwp ) |
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139 | IF(lwm) WRITE ( numoni, namice_dyn ) |
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140 | ! |
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141 | IF(lwp) THEN ! control print |
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142 | WRITE(numout,*) |
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143 | WRITE(numout,*) 'ice_dyn_init: ice parameters for ice dynamics ' |
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144 | WRITE(numout,*) '~~~~~~~~~~~~' |
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145 | WRITE(numout,*) ' Namelist namice_dyn' |
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146 | WRITE(numout,*) ' Ice dynamics (T) or not (F) ln_icedyn = ', ln_icedyn |
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147 | WRITE(numout,*) ' associated switch nn_icedyn = ', nn_icedyn |
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148 | WRITE(numout,*) ' =2 all processes (default option)' |
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149 | WRITE(numout,*) ' =1 advection only (no ridging/rafting)' |
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150 | WRITE(numout,*) ' =0 advection only with prescribed velocity given by ' |
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151 | WRITE(numout,*) ' a uniform field (u,v)_ice = (rn_uice,rn_vice) = (', rn_uice,',', rn_vice,')' |
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152 | WRITE(numout,*) ' lateral boundary condition for sea ice dynamics rn_ishlat = ', rn_ishlat |
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153 | WRITE(numout,*) ' drag coefficient for oceanic stress rn_cio = ', rn_cio |
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154 | WRITE(numout,*) ' Landfast: param (T or F) ln_landfast = ', ln_landfast |
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155 | WRITE(numout,*) ' fraction of ocean depth that ice must reach rn_gamma = ', rn_gamma |
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156 | WRITE(numout,*) ' maximum bottom stress per unit area of contact rn_icebfr = ', rn_icebfr |
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157 | WRITE(numout,*) ' relax time scale (s-1) to reach static friction rn_lfrelax = ', rn_lfrelax |
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158 | ENDIF |
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159 | ! !== set the choice of ice dynamics ==! |
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160 | SELECT CASE( nn_icedyn ) |
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161 | CASE( 2 ) |
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162 | IF( nn_monocat /= 2 ) THEN !--- full dynamics (rheology + advection + ridging/rafting + correction) |
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163 | nice_dyn = np_dynFULL |
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164 | ELSE |
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165 | nice_dyn = np_dyn !--- dynamics without ridging/rafting |
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166 | ENDIF |
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167 | CASE( 1 ) !--- dynamics without ridging/rafting and correction |
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168 | nice_dyn = np_dynPURE |
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169 | CASE( 0 ) !--- prescribed ice velocities (from namelist) |
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170 | nice_dyn = np_dynNO |
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171 | END SELECT |
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172 | ! |
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173 | ! !--- Lateral boundary conditions |
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174 | IF ( rn_ishlat == 0. ) THEN ; IF(lwp) WRITE(numout,*) ' ===>>> ice lateral free-slip' |
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175 | ELSEIF ( rn_ishlat == 2. ) THEN ; IF(lwp) WRITE(numout,*) ' ===>>> ice lateral no-slip' |
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176 | ELSEIF ( 0. < rn_ishlat .AND. rn_ishlat < 2. ) THEN ; IF(lwp) WRITE(numout,*) ' ===>>> ice lateral partial-slip' |
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177 | ELSEIF ( 2. < rn_ishlat ) THEN ; IF(lwp) WRITE(numout,*) ' ===>>> ice lateral strong-slip' |
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178 | ENDIF |
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179 | ! |
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180 | ! !--- NO Landfast ice : set to zero once for all |
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181 | IF( .NOT. ln_landfast ) tau_icebfr(:,:) = 0._wp |
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182 | ! |
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183 | ! !--- simple conservative piling, comparable with LIM2 |
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184 | l_piling = nn_icedyn == 1 .OR. ( nn_monocat == 2 .AND. jpl == 1 ) |
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185 | ! |
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186 | END SUBROUTINE ice_dyn_init |
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187 | |
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188 | #else |
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189 | !!---------------------------------------------------------------------- |
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190 | !! Default option Empty module NO LIM-3 sea-ice model |
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191 | !!---------------------------------------------------------------------- |
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192 | #endif |
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193 | |
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194 | !!====================================================================== |
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195 | END MODULE icedyn |
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