1 | MODULE icerhg |
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2 | !!====================================================================== |
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3 | !! *** MODULE icerhg *** |
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4 | !! Sea-Ice dynamics : |
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5 | !!====================================================================== |
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6 | !! history : 1.0 ! 2002-08 (C. Ethe, G. Madec) original VP code |
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7 | !! 3.0 ! 2007-03 (MA Morales Maqueda, S. Bouillon, M. Vancoppenolle) LIM3: EVP-Cgrid |
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8 | !! 3.5 ! 2011-02 (G. Madec) dynamical allocation |
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9 | !!---------------------------------------------------------------------- |
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10 | #if defined key_lim3 |
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11 | !!---------------------------------------------------------------------- |
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12 | !! 'key_lim3' LIM3 sea-ice model |
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13 | !!---------------------------------------------------------------------- |
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14 | !! ice_rhg : computes ice velocities |
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15 | !! ice_rhg_init : initialization and namelist read |
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16 | !!---------------------------------------------------------------------- |
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17 | USE phycst ! physical constants |
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18 | USE dom_oce ! ocean space and time domain |
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19 | USE ice ! sea-ice: variables |
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20 | USE icerhg_evp ! sea-ice: EVP rheology |
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21 | USE icectl ! sea-ice: control prints |
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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_rhg ! routine called by icestp.F90 |
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34 | PUBLIC ice_rhg_init ! routine called by icestp.F90 |
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35 | |
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36 | !! * Substitutions |
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37 | # include "vectopt_loop_substitute.h90" |
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38 | !!---------------------------------------------------------------------- |
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39 | !! NEMO/ICE 4.0 , NEMO Consortium (2017) |
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40 | !! $Id: icerhg.F90 8378 2017-07-26 13:55:59Z clem $ |
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41 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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42 | !!---------------------------------------------------------------------- |
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43 | CONTAINS |
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44 | |
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45 | SUBROUTINE ice_rhg( kt ) |
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46 | !!------------------------------------------------------------------- |
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47 | !! *** ROUTINE ice_rhg *** |
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48 | !! |
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49 | !! ** Purpose : compute ice velocity |
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50 | !! |
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51 | !! ** Action : comupte - ice velocity (u_ice, v_ice) |
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52 | !! - 3 components of the stress tensor (stress1_i, stress2_i, stress12_i) |
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53 | !! - shear, divergence and delta (shear_i, divu_i, delta_i) |
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54 | !!-------------------------------------------------------------------- |
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55 | INTEGER, INTENT(in) :: kt ! ice time step |
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56 | !! |
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57 | INTEGER :: jl ! dummy loop indices |
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58 | REAL(wp) :: zvi_b, zsmv_b, zei_b, zfs_b, zfw_b, zft_b |
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59 | !!-------------------------------------------------------------------- |
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60 | ! |
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61 | IF( nn_timing == 1 ) CALL timing_start('icerhg') |
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62 | ! |
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63 | IF( kt == nit000 .AND. lwp ) THEN |
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64 | WRITE(numout,*) |
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65 | WRITE(numout,*)'ice_rhg : sea-ice rheology' |
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66 | WRITE(numout,*)'~~~~~~~~' |
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67 | ENDIF |
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68 | |
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69 | CALL ice_var_agg(1) ! -- aggregate ice categories |
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70 | ! |
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71 | ! ! -- conservation test |
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72 | IF( ln_limdiachk ) CALL ice_cons_hsm(0, 'icerhg', zvi_b, zsmv_b, zei_b, zfw_b, zfs_b, zft_b) |
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73 | ! |
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74 | IF( ln_landfast ) THEN ! -- Landfast ice parameterization: define max bottom friction |
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75 | tau_icebfr(:,:) = 0._wp |
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76 | DO jl = 1, jpl |
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77 | WHERE( ht_i(:,:,jl) > ht_n(:,:) * rn_gamma ) tau_icebfr(:,:) = tau_icebfr(:,:) + a_i(:,:,jl) * rn_icebfr |
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78 | END DO |
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79 | ENDIF |
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80 | |
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81 | ! ----------------------- |
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82 | ! Rheology (ice dynamics) |
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83 | ! ----------------------- |
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84 | IF( nn_limdyn /= 0 ) THEN ! -- Ice dynamics |
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85 | ! |
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86 | CALL ice_rhg_evp( stress1_i, stress2_i, stress12_i, u_ice, v_ice, shear_i, divu_i, delta_i ) |
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87 | ! |
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88 | ELSE ! -- prescribed uniform velocity |
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89 | ! |
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90 | u_ice(:,:) = rn_uice * umask(:,:,1) |
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91 | v_ice(:,:) = rn_vice * vmask(:,:,1) |
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92 | !!CALL RANDOM_NUMBER(u_ice(:,:)) |
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93 | !!CALL RANDOM_NUMBER(v_ice(:,:)) |
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94 | ! |
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95 | ENDIF |
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96 | ! |
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97 | ! !- conservation test |
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98 | IF( ln_limdiachk ) CALL ice_cons_hsm(1, 'icerhg', zvi_b, zsmv_b, zei_b, zfw_b, zfs_b, zft_b) |
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99 | IF( ln_ctl ) CALL ice_prt3D ('icerhg') !- Control prints |
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100 | IF( nn_timing == 1 ) CALL timing_stop('icerhg') !- timing |
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101 | ! |
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102 | END SUBROUTINE ice_rhg |
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103 | |
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104 | |
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105 | SUBROUTINE ice_rhg_init |
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106 | !!------------------------------------------------------------------- |
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107 | !! *** ROUTINE ice_rhg_init *** |
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108 | !! |
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109 | !! ** Purpose : Physical constants and parameters linked to the ice |
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110 | !! dynamics |
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111 | !! |
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112 | !! ** Method : Read the namicedyn namelist and check the ice-dynamic |
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113 | !! parameter values called at the first timestep (nit000) |
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114 | !! |
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115 | !! ** input : Namelist namicedyn |
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116 | !!------------------------------------------------------------------- |
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117 | INTEGER :: ios ! Local integer output status for namelist read |
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118 | !! |
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119 | NAMELIST/namicedyn/ nn_limadv , nn_limadv_ord, & |
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120 | & nn_icestr , rn_pe_rdg, rn_pstar , rn_crhg, ln_icestr_bvf , & |
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121 | & rn_ishlat , rn_cio , rn_creepl, rn_ecc , nn_nevp, rn_relast, & |
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122 | & ln_landfast, rn_gamma , rn_icebfr, rn_lfrelax |
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123 | !!------------------------------------------------------------------- |
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124 | ! |
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125 | REWIND( numnam_ice_ref ) ! Namelist namicedyn in reference namelist : Ice dynamics |
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126 | READ ( numnam_ice_ref, namicedyn, IOSTAT = ios, ERR = 901) |
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127 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namicedyn in reference namelist', lwp ) |
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128 | ! |
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129 | REWIND( numnam_ice_cfg ) ! Namelist namicedyn in configuration namelist : Ice dynamics |
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130 | READ ( numnam_ice_cfg, namicedyn, IOSTAT = ios, ERR = 902 ) |
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131 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namicedyn in configuration namelist', lwp ) |
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132 | IF(lwm) WRITE ( numoni, namicedyn ) |
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133 | ! |
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134 | IF(lwp) THEN ! control print |
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135 | WRITE(numout,*) |
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136 | WRITE(numout,*) 'ice_rhg_init : ice parameters for ice dynamics ' |
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137 | WRITE(numout,*) '~~~~~~~~~~~~' |
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138 | WRITE(numout,*) ' Namelist namicedyn' |
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139 | WRITE(numout,*) ' advection scheme for ice transport (limtrp)' |
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140 | WRITE(numout,*) ' type of advection scheme (-1=Prather, 0=Ulimate-Macho) nn_limadv = ', nn_limadv |
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141 | WRITE(numout,*) ' order of the scheme for Ultimate-Macho case nn_limadv_ord = ', nn_limadv_ord |
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142 | WRITE(numout,*) ' ridging/rafting (icerdgrft)' |
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143 | WRITE(numout,*) ' ice strength parameterization (0=Hibler 1=Rothrock) nn_icestr = ', nn_icestr |
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144 | WRITE(numout,*) ' Ratio of ridging work to PotEner change in ridging rn_pe_rdg = ', rn_pe_rdg |
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145 | WRITE(numout,*) ' 1st bulk-rheology parameter rn_pstar = ', rn_pstar |
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146 | WRITE(numout,*) ' 2nd bulk-rhelogy parameter rn_crhg = ', rn_crhg |
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147 | WRITE(numout,*) ' brine volume included in ice strength computation ln_icestr_bvf = ', ln_icestr_bvf |
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148 | WRITE(numout,*) ' rheology EVP (icerhg_evp)' |
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149 | WRITE(numout,*) ' lateral boundary condition for sea ice dynamics rn_ishlat = ', rn_ishlat |
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150 | WRITE(numout,*) ' drag coefficient for oceanic stress rn_cio = ', rn_cio |
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151 | WRITE(numout,*) ' creep limit rn_creepl = ', rn_creepl |
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152 | WRITE(numout,*) ' eccentricity of the elliptical yield curve rn_ecc = ', rn_ecc |
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153 | WRITE(numout,*) ' number of iterations for subcycling nn_nevp = ', nn_nevp |
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154 | WRITE(numout,*) ' ratio of elastic timescale over ice time step rn_relast = ', rn_relast |
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155 | WRITE(numout,*) ' Landfast: param (T or F) ln_landfast = ', ln_landfast |
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156 | WRITE(numout,*) ' fraction of ocean depth that ice must reach rn_gamma = ', rn_gamma |
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157 | WRITE(numout,*) ' maximum bottom stress per unit area of contact rn_icebfr = ', rn_icebfr |
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158 | WRITE(numout,*) ' relax time scale (s-1) to reach static friction rn_lfrelax = ', rn_lfrelax |
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159 | ENDIF |
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160 | ! |
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161 | IF ( rn_ishlat == 0. ) THEN ; IF(lwp) WRITE(numout,*) ' ===>>> ice lateral free-slip' |
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162 | ELSEIF ( rn_ishlat == 2. ) THEN ; IF(lwp) WRITE(numout,*) ' ===>>> ice lateral no-slip' |
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163 | ELSEIF ( 0. < rn_ishlat .AND. rn_ishlat < 2. ) THEN ; IF(lwp) WRITE(numout,*) ' ===>>> ice lateral partial-slip' |
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164 | ELSEIF ( 2. < rn_ishlat ) THEN ; IF(lwp) WRITE(numout,*) ' ===>>> ice lateral strong-slip' |
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165 | ENDIF |
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166 | ! |
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167 | IF( .NOT. ln_landfast ) tau_icebfr(:,:) = 0._wp ! NO Landfast ice : set to zero one for all |
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168 | ! |
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169 | END SUBROUTINE ice_rhg_init |
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170 | |
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171 | #else |
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172 | !!---------------------------------------------------------------------- |
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173 | !! Default option Empty module NO LIM-3 sea-ice model |
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174 | !!---------------------------------------------------------------------- |
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175 | #endif |
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176 | |
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177 | !!====================================================================== |
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178 | END MODULE icerhg |
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