1 | MODULE icedyn_rhg_evp |
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2 | !!====================================================================== |
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3 | !! *** MODULE icedyn_rhg_evp *** |
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4 | !! Sea-Ice dynamics : rheology Elasto-Viscous-Plastic |
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5 | !!====================================================================== |
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6 | !! History : - ! 2007-03 (M.A. Morales Maqueda, S. Bouillon) Original code |
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7 | !! 3.0 ! 2008-03 (M. Vancoppenolle) adaptation to new model |
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8 | !! - ! 2008-11 (M. Vancoppenolle, S. Bouillon, Y. Aksenov) add surface tilt in ice rheolohy |
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9 | !! 3.3 ! 2009-05 (G.Garric) addition of the evp case |
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10 | !! 3.4 ! 2011-01 (A. Porter) dynamical allocation |
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11 | !! 3.5 ! 2012-08 (R. Benshila) AGRIF |
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12 | !! 3.6 ! 2016-06 (C. Rousset) Rewriting + landfast ice + mEVP (Bouillon 2013) |
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13 | !! 3.7 ! 2017 (C. Rousset) add aEVP (Kimmritz 2016-2017) |
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14 | !! 4.0 ! 2018 (many people) SI3 [aka Sea Ice cube] |
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15 | !!---------------------------------------------------------------------- |
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16 | #if defined key_si3 |
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17 | !!---------------------------------------------------------------------- |
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18 | !! 'key_si3' SI3 sea-ice model |
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19 | !!---------------------------------------------------------------------- |
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20 | !! ice_dyn_rhg_evp : computes ice velocities from EVP rheology |
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21 | !! rhg_evp_rst : read/write EVP fields in ice restart |
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22 | !!---------------------------------------------------------------------- |
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23 | USE phycst ! Physical constant |
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24 | USE dom_oce ! Ocean domain |
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25 | USE sbc_oce , ONLY : ln_ice_embd, nn_fsbc, ssh_m |
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26 | USE sbc_ice , ONLY : utau_ice, vtau_ice, snwice_mass, snwice_mass_b |
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27 | USE ice ! sea-ice: ice variables |
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28 | USE icevar ! ice_var_sshdyn |
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29 | USE icedyn_rdgrft ! sea-ice: ice strength |
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30 | USE bdy_oce , ONLY : ln_bdy |
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31 | USE bdyice |
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32 | #if defined key_agrif |
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33 | USE agrif_ice_interp |
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34 | #endif |
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35 | ! |
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36 | USE in_out_manager ! I/O manager |
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37 | USE iom ! I/O manager library |
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38 | USE lib_mpp ! MPP library |
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39 | USE lib_fortran ! fortran utilities (glob_sum + no signed zero) |
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40 | USE lbclnk ! lateral boundary conditions (or mpp links) |
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41 | USE prtctl ! Print control |
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42 | |
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43 | IMPLICIT NONE |
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44 | PRIVATE |
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45 | |
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46 | PUBLIC ice_dyn_rhg_evp ! called by icedyn_rhg.F90 |
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47 | PUBLIC rhg_evp_rst ! called by icedyn_rhg.F90 |
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48 | |
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49 | !! * Substitutions |
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50 | # include "vectopt_loop_substitute.h90" |
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51 | !!---------------------------------------------------------------------- |
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52 | !! NEMO/ICE 4.0 , NEMO Consortium (2018) |
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53 | !! $Id$ |
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54 | !! Software governed by the CeCILL license (see ./LICENSE) |
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55 | !!---------------------------------------------------------------------- |
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56 | CONTAINS |
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57 | |
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58 | SUBROUTINE ice_dyn_rhg_evp( kt, pstress1_i, pstress2_i, pstress12_i, pshear_i, pdivu_i, pdelta_i ) |
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59 | !!------------------------------------------------------------------- |
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60 | !! *** SUBROUTINE ice_dyn_rhg_evp *** |
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61 | !! EVP-C-grid |
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62 | !! |
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63 | !! ** purpose : determines sea ice drift from wind stress, ice-ocean |
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64 | !! stress and sea-surface slope. Ice-ice interaction is described by |
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65 | !! a non-linear elasto-viscous-plastic (EVP) law including shear |
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66 | !! strength and a bulk rheology (Hunke and Dukowicz, 2002). |
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67 | !! |
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68 | !! The points in the C-grid look like this, dear reader |
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69 | !! |
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70 | !! (ji,jj) |
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71 | !! | |
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72 | !! | |
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73 | !! (ji-1,jj) | (ji,jj) |
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74 | !! --------- |
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75 | !! | | |
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76 | !! | (ji,jj) |------(ji,jj) |
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77 | !! | | |
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78 | !! --------- |
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79 | !! (ji-1,jj-1) (ji,jj-1) |
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80 | !! |
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81 | !! ** Inputs : - wind forcing (stress), oceanic currents |
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82 | !! ice total volume (vt_i) per unit area |
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83 | !! snow total volume (vt_s) per unit area |
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84 | !! |
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85 | !! ** Action : - compute u_ice, v_ice : the components of the |
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86 | !! sea-ice velocity vector |
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87 | !! - compute delta_i, shear_i, divu_i, which are inputs |
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88 | !! of the ice thickness distribution |
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89 | !! |
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90 | !! ** Steps : 0) compute mask at F point |
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91 | !! 1) Compute ice snow mass, ice strength |
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92 | !! 2) Compute wind, oceanic stresses, mass terms and |
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93 | !! coriolis terms of the momentum equation |
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94 | !! 3) Solve the momentum equation (iterative procedure) |
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95 | !! 4) Recompute delta, shear and divergence |
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96 | !! (which are inputs of the ITD) & store stress |
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97 | !! for the next time step |
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98 | !! 5) Diagnostics including charge ellipse |
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99 | !! |
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100 | !! ** Notes : There is the possibility to use aEVP from the nice work of Kimmritz et al. (2016 & 2017) |
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101 | !! by setting up ln_aEVP=T (i.e. changing alpha and beta parameters). |
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102 | !! This is an upgraded version of mEVP from Bouillon et al. 2013 |
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103 | !! (i.e. more stable and better convergence) |
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104 | !! |
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105 | !! References : Hunke and Dukowicz, JPO97 |
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106 | !! Bouillon et al., Ocean Modelling 2009 |
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107 | !! Bouillon et al., Ocean Modelling 2013 |
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108 | !! Kimmritz et al., Ocean Modelling 2016 & 2017 |
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109 | !!------------------------------------------------------------------- |
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110 | INTEGER , INTENT(in ) :: kt ! time step |
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111 | REAL(wp), DIMENSION(:,:), INTENT(inout) :: pstress1_i, pstress2_i, pstress12_i ! |
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112 | REAL(wp), DIMENSION(:,:), INTENT( out) :: pshear_i , pdivu_i , pdelta_i ! |
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113 | !! |
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114 | INTEGER :: ji, jj ! dummy loop indices |
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115 | INTEGER :: jter ! local integers |
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116 | ! |
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117 | REAL(wp) :: zrhoco ! rau0 * rn_cio |
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118 | REAL(wp) :: zdtevp, z1_dtevp ! time step for subcycling |
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119 | REAL(wp) :: ecc2, z1_ecc2 ! square of yield ellipse eccenticity |
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120 | REAL(wp) :: zalph1, z1_alph1, zalph2, z1_alph2 ! alpha coef from Bouillon 2009 or Kimmritz 2017 |
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121 | REAL(wp) :: zm1, zm2, zm3, zmassU, zmassV, zvU, zvV ! ice/snow mass and volume |
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122 | REAL(wp) :: zdelta, zp_delf, zds2, zdt, zdt2, zdiv, zdiv2 ! temporary scalars |
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123 | REAL(wp) :: zTauO, zTauB, zTauE, zvel ! temporary scalars |
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124 | REAL(wp) :: zkt ! isotropic tensile strength for landfast ice |
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125 | REAL(wp) :: zvCr ! critical ice volume above which ice is landfast |
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126 | ! |
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127 | REAL(wp) :: zresm ! Maximal error on ice velocity |
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128 | REAL(wp) :: zintb, zintn ! dummy argument |
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129 | REAL(wp) :: zfac_x, zfac_y |
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130 | REAL(wp) :: zshear, zdum1, zdum2 |
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131 | ! |
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132 | REAL(wp), DIMENSION(jpi,jpj) :: z1_e1t0, z1_e2t0 ! scale factors |
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133 | REAL(wp), DIMENSION(jpi,jpj) :: zp_delt ! P/delta at T points |
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134 | REAL(wp), DIMENSION(jpi,jpj) :: zbeta ! beta coef from Kimmritz 2017 |
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135 | ! |
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136 | REAL(wp), DIMENSION(jpi,jpj) :: zdt_m ! (dt / ice-snow_mass) on T points |
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137 | REAL(wp), DIMENSION(jpi,jpj) :: zaU , zaV ! ice fraction on U/V points |
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138 | REAL(wp), DIMENSION(jpi,jpj) :: zmU_t, zmV_t ! (ice-snow_mass / dt) on U/V points |
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139 | REAL(wp), DIMENSION(jpi,jpj) :: zmf ! coriolis parameter at T points |
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140 | REAL(wp), DIMENSION(jpi,jpj) :: v_oceU, u_oceV, v_iceU, u_iceV ! ocean/ice u/v component on V/U points |
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141 | ! |
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142 | REAL(wp), DIMENSION(jpi,jpj) :: zds ! shear |
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143 | REAL(wp), DIMENSION(jpi,jpj) :: zs1, zs2, zs12 ! stress tensor components |
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144 | !!$ REAL(wp), DIMENSION(jpi,jpj) :: zu_ice, zv_ice, zresr ! check convergence |
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145 | REAL(wp), DIMENSION(jpi,jpj) :: zsshdyn ! array used for the calculation of ice surface slope: |
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146 | ! ! ocean surface (ssh_m) if ice is not embedded |
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147 | ! ! ice bottom surface if ice is embedded |
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148 | REAL(wp), DIMENSION(jpi,jpj) :: zfU , zfV ! internal stresses |
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149 | REAL(wp), DIMENSION(jpi,jpj) :: zspgU, zspgV ! surface pressure gradient at U/V points |
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150 | REAL(wp), DIMENSION(jpi,jpj) :: zCorU, zCorV ! Coriolis stress array |
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151 | REAL(wp), DIMENSION(jpi,jpj) :: ztaux_ai, ztauy_ai ! ice-atm. stress at U-V points |
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152 | REAL(wp), DIMENSION(jpi,jpj) :: ztaux_oi, ztauy_oi ! ice-ocean stress at U-V points |
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153 | REAL(wp), DIMENSION(jpi,jpj) :: ztaux_bi, ztauy_bi ! ice-OceanBottom stress at U-V points (landfast) |
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154 | REAL(wp), DIMENSION(jpi,jpj) :: ztaux_base, ztauy_base ! ice-bottom stress at U-V points (landfast) |
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155 | ! |
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156 | REAL(wp), DIMENSION(jpi,jpj) :: zmsk01x, zmsk01y ! dummy arrays |
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157 | REAL(wp), DIMENSION(jpi,jpj) :: zmsk00x, zmsk00y ! mask for ice presence |
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158 | REAL(wp), DIMENSION(jpi,jpj) :: zfmask, zwf ! mask at F points for the ice |
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159 | |
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160 | REAL(wp), PARAMETER :: zepsi = 1.0e-20_wp ! tolerance parameter |
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161 | REAL(wp), PARAMETER :: zmmin = 1._wp ! ice mass (kg/m2) below which ice velocity becomes very small |
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162 | REAL(wp), PARAMETER :: zamin = 0.001_wp ! ice concentration below which ice velocity becomes very small |
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163 | !! --- diags |
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164 | REAL(wp), DIMENSION(jpi,jpj) :: zmsk00 |
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165 | REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zsig1, zsig2, zsig3 |
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166 | !! --- SIMIP diags |
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167 | REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zdiag_xmtrp_ice ! X-component of ice mass transport (kg/s) |
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168 | REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zdiag_ymtrp_ice ! Y-component of ice mass transport (kg/s) |
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169 | REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zdiag_xmtrp_snw ! X-component of snow mass transport (kg/s) |
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170 | REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zdiag_ymtrp_snw ! Y-component of snow mass transport (kg/s) |
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171 | REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zdiag_xatrp ! X-component of area transport (m2/s) |
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172 | REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zdiag_yatrp ! Y-component of area transport (m2/s) |
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173 | !!------------------------------------------------------------------- |
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174 | |
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175 | IF( kt == nit000 .AND. lwp ) WRITE(numout,*) '-- ice_dyn_rhg_evp: EVP sea-ice rheology' |
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176 | ! |
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177 | !!gm for Clem: OPTIMIZATION: I think zfmask can be computed one for all at the initialization.... |
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178 | !------------------------------------------------------------------------------! |
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179 | ! 0) mask at F points for the ice |
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180 | !------------------------------------------------------------------------------! |
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181 | ! ocean/land mask |
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182 | DO jj = 1, jpjm1 |
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183 | DO ji = 1, jpim1 ! NO vector opt. |
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184 | zfmask(ji,jj) = tmask(ji,jj,1) * tmask(ji+1,jj,1) * tmask(ji,jj+1,1) * tmask(ji+1,jj+1,1) |
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185 | END DO |
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186 | END DO |
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187 | CALL lbc_lnk( 'icedyn_rhg_evp', zfmask, 'F', 1._wp ) |
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188 | |
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189 | ! Lateral boundary conditions on velocity (modify zfmask) |
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190 | zwf(:,:) = zfmask(:,:) |
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191 | DO jj = 2, jpjm1 |
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192 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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193 | IF( zfmask(ji,jj) == 0._wp ) THEN |
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194 | zfmask(ji,jj) = rn_ishlat * MIN( 1._wp , MAX( zwf(ji+1,jj), zwf(ji,jj+1), zwf(ji-1,jj), zwf(ji,jj-1) ) ) |
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195 | ENDIF |
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196 | END DO |
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197 | END DO |
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198 | DO jj = 2, jpjm1 |
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199 | IF( zfmask(1,jj) == 0._wp ) THEN |
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200 | zfmask(1 ,jj) = rn_ishlat * MIN( 1._wp , MAX( zwf(2,jj), zwf(1,jj+1), zwf(1,jj-1) ) ) |
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201 | ENDIF |
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202 | IF( zfmask(jpi,jj) == 0._wp ) THEN |
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203 | zfmask(jpi,jj) = rn_ishlat * MIN( 1._wp , MAX( zwf(jpi,jj+1), zwf(jpim1,jj), zwf(jpi,jj-1) ) ) |
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204 | ENDIF |
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205 | END DO |
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206 | DO ji = 2, jpim1 |
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207 | IF( zfmask(ji,1) == 0._wp ) THEN |
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208 | zfmask(ji,1 ) = rn_ishlat * MIN( 1._wp , MAX( zwf(ji+1,1), zwf(ji,2), zwf(ji-1,1) ) ) |
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209 | ENDIF |
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210 | IF( zfmask(ji,jpj) == 0._wp ) THEN |
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211 | zfmask(ji,jpj) = rn_ishlat * MIN( 1._wp , MAX( zwf(ji+1,jpj), zwf(ji-1,jpj), zwf(ji,jpjm1) ) ) |
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212 | ENDIF |
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213 | END DO |
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214 | CALL lbc_lnk( 'icedyn_rhg_evp', zfmask, 'F', 1._wp ) |
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215 | |
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216 | !------------------------------------------------------------------------------! |
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217 | ! 1) define some variables and initialize arrays |
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218 | !------------------------------------------------------------------------------! |
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219 | zrhoco = rau0 * rn_cio |
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220 | |
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221 | ! ecc2: square of yield ellipse eccenticrity |
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222 | ecc2 = rn_ecc * rn_ecc |
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223 | z1_ecc2 = 1._wp / ecc2 |
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224 | |
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225 | ! Time step for subcycling |
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226 | zdtevp = rdt_ice / REAL( nn_nevp ) |
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227 | z1_dtevp = 1._wp / zdtevp |
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228 | |
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229 | ! alpha parameters (Bouillon 2009) |
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230 | IF( .NOT. ln_aEVP ) THEN |
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231 | zalph1 = ( 2._wp * rn_relast * rdt_ice ) * z1_dtevp |
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232 | zalph2 = zalph1 * z1_ecc2 |
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233 | |
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234 | z1_alph1 = 1._wp / ( zalph1 + 1._wp ) |
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235 | z1_alph2 = 1._wp / ( zalph2 + 1._wp ) |
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236 | ENDIF |
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237 | |
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238 | ! Initialise stress tensor |
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239 | zs1 (:,:) = pstress1_i (:,:) |
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240 | zs2 (:,:) = pstress2_i (:,:) |
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241 | zs12(:,:) = pstress12_i(:,:) |
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242 | |
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243 | ! Ice strength |
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244 | CALL ice_strength |
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245 | |
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246 | ! scale factors |
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247 | DO jj = 2, jpjm1 |
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248 | DO ji = fs_2, fs_jpim1 |
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249 | z1_e1t0(ji,jj) = 1._wp / ( e1t(ji+1,jj ) + e1t(ji,jj ) ) |
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250 | z1_e2t0(ji,jj) = 1._wp / ( e2t(ji ,jj+1) + e2t(ji,jj ) ) |
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251 | END DO |
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252 | END DO |
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253 | |
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254 | ! landfast param from Lemieux(2016): add isotropic tensile strength (following Konig Beatty and Holland, 2010) |
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255 | IF( ln_landfast_L16 ) THEN ; zkt = rn_tensile |
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256 | ELSE ; zkt = 0._wp |
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257 | ENDIF |
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258 | ! |
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259 | !------------------------------------------------------------------------------! |
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260 | ! 2) Wind / ocean stress, mass terms, coriolis terms |
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261 | !------------------------------------------------------------------------------! |
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262 | ! sea surface height |
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263 | ! embedded sea ice: compute representative ice top surface |
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264 | ! non-embedded sea ice: use ocean surface for slope calculation |
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265 | zsshdyn(:,:) = ice_var_sshdyn( ssh_m, snwice_mass, snwice_mass_b) |
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266 | |
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267 | DO jj = 2, jpjm1 |
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268 | DO ji = fs_2, fs_jpim1 |
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269 | |
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270 | ! ice fraction at U-V points |
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271 | zaU(ji,jj) = 0.5_wp * ( at_i(ji,jj) * e1e2t(ji,jj) + at_i(ji+1,jj) * e1e2t(ji+1,jj) ) * r1_e1e2u(ji,jj) * umask(ji,jj,1) |
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272 | zaV(ji,jj) = 0.5_wp * ( at_i(ji,jj) * e1e2t(ji,jj) + at_i(ji,jj+1) * e1e2t(ji,jj+1) ) * r1_e1e2v(ji,jj) * vmask(ji,jj,1) |
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273 | |
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274 | ! Ice/snow mass at U-V points |
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275 | zm1 = ( rhos * vt_s(ji ,jj ) + rhoi * vt_i(ji ,jj ) ) |
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276 | zm2 = ( rhos * vt_s(ji+1,jj ) + rhoi * vt_i(ji+1,jj ) ) |
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277 | zm3 = ( rhos * vt_s(ji ,jj+1) + rhoi * vt_i(ji ,jj+1) ) |
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278 | zmassU = 0.5_wp * ( zm1 * e1e2t(ji,jj) + zm2 * e1e2t(ji+1,jj) ) * r1_e1e2u(ji,jj) * umask(ji,jj,1) |
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279 | zmassV = 0.5_wp * ( zm1 * e1e2t(ji,jj) + zm3 * e1e2t(ji,jj+1) ) * r1_e1e2v(ji,jj) * vmask(ji,jj,1) |
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280 | |
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281 | ! Ocean currents at U-V points |
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282 | v_oceU(ji,jj) = 0.5_wp * ( ( v_oce(ji ,jj) + v_oce(ji ,jj-1) ) * e1t(ji+1,jj) & |
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283 | & + ( v_oce(ji+1,jj) + v_oce(ji+1,jj-1) ) * e1t(ji ,jj) ) * z1_e1t0(ji,jj) * umask(ji,jj,1) |
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284 | |
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285 | u_oceV(ji,jj) = 0.5_wp * ( ( u_oce(ji,jj ) + u_oce(ji-1,jj ) ) * e2t(ji,jj+1) & |
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286 | & + ( u_oce(ji,jj+1) + u_oce(ji-1,jj+1) ) * e2t(ji,jj ) ) * z1_e2t0(ji,jj) * vmask(ji,jj,1) |
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287 | |
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288 | ! Coriolis at T points (m*f) |
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289 | zmf(ji,jj) = zm1 * ff_t(ji,jj) |
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290 | |
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291 | ! dt/m at T points (for alpha and beta coefficients) |
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292 | zdt_m(ji,jj) = zdtevp / MAX( zm1, zmmin ) |
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293 | |
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294 | ! m/dt |
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295 | zmU_t(ji,jj) = zmassU * z1_dtevp |
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296 | zmV_t(ji,jj) = zmassV * z1_dtevp |
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297 | |
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298 | ! Drag ice-atm. |
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299 | ztaux_ai(ji,jj) = zaU(ji,jj) * utau_ice(ji,jj) |
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300 | ztauy_ai(ji,jj) = zaV(ji,jj) * vtau_ice(ji,jj) |
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301 | |
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302 | ! Surface pressure gradient (- m*g*GRAD(ssh)) at U-V points |
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303 | zspgU(ji,jj) = - zmassU * grav * ( zsshdyn(ji+1,jj) - zsshdyn(ji,jj) ) * r1_e1u(ji,jj) |
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304 | zspgV(ji,jj) = - zmassV * grav * ( zsshdyn(ji,jj+1) - zsshdyn(ji,jj) ) * r1_e2v(ji,jj) |
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305 | |
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306 | ! masks |
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307 | zmsk00x(ji,jj) = 1._wp - MAX( 0._wp, SIGN( 1._wp, -zmassU ) ) ! 0 if no ice |
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308 | zmsk00y(ji,jj) = 1._wp - MAX( 0._wp, SIGN( 1._wp, -zmassV ) ) ! 0 if no ice |
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309 | |
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310 | ! switches |
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311 | IF( zmassU <= zmmin .AND. zaU(ji,jj) <= zamin ) THEN ; zmsk01x(ji,jj) = 0._wp |
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312 | ELSE ; zmsk01x(ji,jj) = 1._wp ; ENDIF |
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313 | IF( zmassV <= zmmin .AND. zaV(ji,jj) <= zamin ) THEN ; zmsk01y(ji,jj) = 0._wp |
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314 | ELSE ; zmsk01y(ji,jj) = 1._wp ; ENDIF |
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315 | |
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316 | END DO |
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317 | END DO |
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318 | CALL lbc_lnk_multi( 'icedyn_rhg_evp', zmf, 'T', 1., zdt_m, 'T', 1. ) |
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319 | ! |
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320 | ! !== Landfast ice parameterization ==! |
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321 | ! |
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322 | IF( ln_landfast_L16 ) THEN !-- Lemieux 2016 |
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323 | DO jj = 2, jpjm1 |
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324 | DO ji = fs_2, fs_jpim1 |
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325 | ! ice thickness at U-V points |
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326 | zvU = 0.5_wp * ( vt_i(ji,jj) * e1e2t(ji,jj) + vt_i(ji+1,jj) * e1e2t(ji+1,jj) ) * r1_e1e2u(ji,jj) * umask(ji,jj,1) |
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327 | zvV = 0.5_wp * ( vt_i(ji,jj) * e1e2t(ji,jj) + vt_i(ji,jj+1) * e1e2t(ji,jj+1) ) * r1_e1e2v(ji,jj) * vmask(ji,jj,1) |
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328 | ! ice-bottom stress at U points |
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329 | zvCr = zaU(ji,jj) * rn_depfra * hu_n(ji,jj) |
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330 | ztaux_base(ji,jj) = - rn_icebfr * MAX( 0._wp, zvU - zvCr ) * EXP( -rn_crhg * ( 1._wp - zaU(ji,jj) ) ) |
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331 | ! ice-bottom stress at V points |
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332 | zvCr = zaV(ji,jj) * rn_depfra * hv_n(ji,jj) |
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333 | ztauy_base(ji,jj) = - rn_icebfr * MAX( 0._wp, zvV - zvCr ) * EXP( -rn_crhg * ( 1._wp - zaV(ji,jj) ) ) |
---|
334 | ! ice_bottom stress at T points |
---|
335 | zvCr = at_i(ji,jj) * rn_depfra * ht_n(ji,jj) |
---|
336 | tau_icebfr(ji,jj) = - rn_icebfr * MAX( 0._wp, vt_i(ji,jj) - zvCr ) * EXP( -rn_crhg * ( 1._wp - at_i(ji,jj) ) ) |
---|
337 | END DO |
---|
338 | END DO |
---|
339 | CALL lbc_lnk( 'icedyn_rhg_evp', tau_icebfr(:,:), 'T', 1. ) |
---|
340 | ! |
---|
341 | ELSE !-- no landfast |
---|
342 | DO jj = 2, jpjm1 |
---|
343 | DO ji = fs_2, fs_jpim1 |
---|
344 | ztaux_base(ji,jj) = 0._wp |
---|
345 | ztauy_base(ji,jj) = 0._wp |
---|
346 | END DO |
---|
347 | END DO |
---|
348 | ENDIF |
---|
349 | |
---|
350 | !------------------------------------------------------------------------------! |
---|
351 | ! 3) Solution of the momentum equation, iterative procedure |
---|
352 | !------------------------------------------------------------------------------! |
---|
353 | ! |
---|
354 | ! ! ==================== ! |
---|
355 | DO jter = 1 , nn_nevp ! loop over jter ! |
---|
356 | ! ! ==================== ! |
---|
357 | l_full_nf_update = jter == nn_nevp ! false: disable full North fold update (performances) for iter = 1 to nn_nevp-1 |
---|
358 | ! |
---|
359 | !!$ IF(ln_ctl) THEN ! Convergence test |
---|
360 | !!$ DO jj = 1, jpjm1 |
---|
361 | !!$ zu_ice(:,jj) = u_ice(:,jj) ! velocity at previous time step |
---|
362 | !!$ zv_ice(:,jj) = v_ice(:,jj) |
---|
363 | !!$ END DO |
---|
364 | !!$ ENDIF |
---|
365 | |
---|
366 | ! --- divergence, tension & shear (Appendix B of Hunke & Dukowicz, 2002) --- ! |
---|
367 | DO jj = 1, jpjm1 ! loops start at 1 since there is no boundary condition (lbc_lnk) at i=1 and j=1 for F points |
---|
368 | DO ji = 1, jpim1 |
---|
369 | |
---|
370 | ! shear at F points |
---|
371 | zds(ji,jj) = ( ( u_ice(ji,jj+1) * r1_e1u(ji,jj+1) - u_ice(ji,jj) * r1_e1u(ji,jj) ) * e1f(ji,jj) * e1f(ji,jj) & |
---|
372 | & + ( v_ice(ji+1,jj) * r1_e2v(ji+1,jj) - v_ice(ji,jj) * r1_e2v(ji,jj) ) * e2f(ji,jj) * e2f(ji,jj) & |
---|
373 | & ) * r1_e1e2f(ji,jj) * zfmask(ji,jj) |
---|
374 | |
---|
375 | END DO |
---|
376 | END DO |
---|
377 | CALL lbc_lnk( 'icedyn_rhg_evp', zds, 'F', 1. ) |
---|
378 | |
---|
379 | DO jj = 2, jpj ! loop to jpi,jpj to avoid making a communication for zs1,zs2,zs12 |
---|
380 | DO ji = 2, jpi ! no vector loop |
---|
381 | |
---|
382 | ! shear**2 at T points (doc eq. A16) |
---|
383 | zds2 = ( zds(ji,jj ) * zds(ji,jj ) * e1e2f(ji,jj ) + zds(ji-1,jj ) * zds(ji-1,jj ) * e1e2f(ji-1,jj ) & |
---|
384 | & + zds(ji,jj-1) * zds(ji,jj-1) * e1e2f(ji,jj-1) + zds(ji-1,jj-1) * zds(ji-1,jj-1) * e1e2f(ji-1,jj-1) & |
---|
385 | & ) * 0.25_wp * r1_e1e2t(ji,jj) |
---|
386 | |
---|
387 | ! divergence at T points |
---|
388 | zdiv = ( e2u(ji,jj) * u_ice(ji,jj) - e2u(ji-1,jj) * u_ice(ji-1,jj) & |
---|
389 | & + e1v(ji,jj) * v_ice(ji,jj) - e1v(ji,jj-1) * v_ice(ji,jj-1) & |
---|
390 | & ) * r1_e1e2t(ji,jj) |
---|
391 | zdiv2 = zdiv * zdiv |
---|
392 | |
---|
393 | ! tension at T points |
---|
394 | zdt = ( ( u_ice(ji,jj) * r1_e2u(ji,jj) - u_ice(ji-1,jj) * r1_e2u(ji-1,jj) ) * e2t(ji,jj) * e2t(ji,jj) & |
---|
395 | & - ( v_ice(ji,jj) * r1_e1v(ji,jj) - v_ice(ji,jj-1) * r1_e1v(ji,jj-1) ) * e1t(ji,jj) * e1t(ji,jj) & |
---|
396 | & ) * r1_e1e2t(ji,jj) |
---|
397 | zdt2 = zdt * zdt |
---|
398 | |
---|
399 | ! delta at T points |
---|
400 | zdelta = SQRT( zdiv2 + ( zdt2 + zds2 ) * z1_ecc2 ) |
---|
401 | |
---|
402 | ! P/delta at T points |
---|
403 | zp_delt(ji,jj) = strength(ji,jj) / ( zdelta + rn_creepl ) |
---|
404 | |
---|
405 | ! alpha & beta for aEVP |
---|
406 | ! gamma = 0.5*P/(delta+creepl) * (c*pi)**2/Area * dt/m |
---|
407 | ! alpha = beta = sqrt(4*gamma) |
---|
408 | IF( ln_aEVP ) THEN |
---|
409 | zalph1 = MAX( 50._wp, rpi * SQRT( 0.5_wp * zp_delt(ji,jj) * r1_e1e2t(ji,jj) * zdt_m(ji,jj) ) ) |
---|
410 | z1_alph1 = 1._wp / ( zalph1 + 1._wp ) |
---|
411 | zalph2 = zalph1 |
---|
412 | z1_alph2 = z1_alph1 |
---|
413 | ENDIF |
---|
414 | |
---|
415 | ! stress at T points (zkt/=0 if landfast) |
---|
416 | zs1(ji,jj) = ( zs1(ji,jj) * zalph1 + zp_delt(ji,jj) * ( zdiv * (1._wp + zkt) - zdelta * (1._wp - zkt) ) ) * z1_alph1 |
---|
417 | zs2(ji,jj) = ( zs2(ji,jj) * zalph2 + zp_delt(ji,jj) * ( zdt * z1_ecc2 * (1._wp + zkt) ) ) * z1_alph2 |
---|
418 | |
---|
419 | END DO |
---|
420 | END DO |
---|
421 | CALL lbc_lnk( 'icedyn_rhg_evp', zp_delt, 'T', 1. ) |
---|
422 | |
---|
423 | DO jj = 1, jpjm1 |
---|
424 | DO ji = 1, jpim1 |
---|
425 | |
---|
426 | ! alpha & beta for aEVP |
---|
427 | IF( ln_aEVP ) THEN |
---|
428 | zalph2 = MAX( 50._wp, rpi * SQRT( 0.5_wp * zp_delt(ji,jj) * r1_e1e2t(ji,jj) * zdt_m(ji,jj) ) ) |
---|
429 | z1_alph2 = 1._wp / ( zalph2 + 1._wp ) |
---|
430 | zbeta(ji,jj) = zalph2 |
---|
431 | ENDIF |
---|
432 | |
---|
433 | ! P/delta at F points |
---|
434 | zp_delf = 0.25_wp * ( zp_delt(ji,jj) + zp_delt(ji+1,jj) + zp_delt(ji,jj+1) + zp_delt(ji+1,jj+1) ) |
---|
435 | |
---|
436 | ! stress at F points (zkt/=0 if landfast) |
---|
437 | zs12(ji,jj)= ( zs12(ji,jj) * zalph2 + zp_delf * ( zds(ji,jj) * z1_ecc2 * (1._wp + zkt) ) * 0.5_wp ) * z1_alph2 |
---|
438 | |
---|
439 | END DO |
---|
440 | END DO |
---|
441 | |
---|
442 | ! --- Ice internal stresses (Appendix C of Hunke and Dukowicz, 2002) --- ! |
---|
443 | DO jj = 2, jpjm1 |
---|
444 | DO ji = fs_2, fs_jpim1 |
---|
445 | ! !--- U points |
---|
446 | zfU(ji,jj) = 0.5_wp * ( ( zs1(ji+1,jj) - zs1(ji,jj) ) * e2u(ji,jj) & |
---|
447 | & + ( zs2(ji+1,jj) * e2t(ji+1,jj) * e2t(ji+1,jj) - zs2(ji,jj) * e2t(ji,jj) * e2t(ji,jj) & |
---|
448 | & ) * r1_e2u(ji,jj) & |
---|
449 | & + ( zs12(ji,jj) * e1f(ji,jj) * e1f(ji,jj) - zs12(ji,jj-1) * e1f(ji,jj-1) * e1f(ji,jj-1) & |
---|
450 | & ) * 2._wp * r1_e1u(ji,jj) & |
---|
451 | & ) * r1_e1e2u(ji,jj) |
---|
452 | ! |
---|
453 | ! !--- V points |
---|
454 | zfV(ji,jj) = 0.5_wp * ( ( zs1(ji,jj+1) - zs1(ji,jj) ) * e1v(ji,jj) & |
---|
455 | & - ( zs2(ji,jj+1) * e1t(ji,jj+1) * e1t(ji,jj+1) - zs2(ji,jj) * e1t(ji,jj) * e1t(ji,jj) & |
---|
456 | & ) * r1_e1v(ji,jj) & |
---|
457 | & + ( zs12(ji,jj) * e2f(ji,jj) * e2f(ji,jj) - zs12(ji-1,jj) * e2f(ji-1,jj) * e2f(ji-1,jj) & |
---|
458 | & ) * 2._wp * r1_e2v(ji,jj) & |
---|
459 | & ) * r1_e1e2v(ji,jj) |
---|
460 | ! |
---|
461 | ! !--- u_ice at V point |
---|
462 | u_iceV(ji,jj) = 0.5_wp * ( ( u_ice(ji,jj ) + u_ice(ji-1,jj ) ) * e2t(ji,jj+1) & |
---|
463 | & + ( u_ice(ji,jj+1) + u_ice(ji-1,jj+1) ) * e2t(ji,jj ) ) * z1_e2t0(ji,jj) * vmask(ji,jj,1) |
---|
464 | ! |
---|
465 | ! !--- v_ice at U point |
---|
466 | v_iceU(ji,jj) = 0.5_wp * ( ( v_ice(ji ,jj) + v_ice(ji ,jj-1) ) * e1t(ji+1,jj) & |
---|
467 | & + ( v_ice(ji+1,jj) + v_ice(ji+1,jj-1) ) * e1t(ji ,jj) ) * z1_e1t0(ji,jj) * umask(ji,jj,1) |
---|
468 | END DO |
---|
469 | END DO |
---|
470 | ! |
---|
471 | ! --- Computation of ice velocity --- ! |
---|
472 | ! Bouillon et al. 2013 (eq 47-48) => unstable unless alpha, beta vary as in Kimmritz 2016 & 2017 |
---|
473 | ! Bouillon et al. 2009 (eq 34-35) => stable |
---|
474 | IF( MOD(jter,2) == 0 ) THEN ! even iterations |
---|
475 | ! |
---|
476 | DO jj = 2, jpjm1 |
---|
477 | DO ji = fs_2, fs_jpim1 |
---|
478 | ! !--- tau_io/(v_oce - v_ice) |
---|
479 | zTauO = zaV(ji,jj) * zrhoco * SQRT( ( v_ice (ji,jj) - v_oce (ji,jj) ) * ( v_ice (ji,jj) - v_oce (ji,jj) ) & |
---|
480 | & + ( u_iceV(ji,jj) - u_oceV(ji,jj) ) * ( u_iceV(ji,jj) - u_oceV(ji,jj) ) ) |
---|
481 | ! !--- Ocean-to-Ice stress |
---|
482 | ztauy_oi(ji,jj) = zTauO * ( v_oce(ji,jj) - v_ice(ji,jj) ) |
---|
483 | ! |
---|
484 | ! !--- tau_bottom/v_ice |
---|
485 | zvel = 5.e-05_wp + SQRT( v_ice(ji,jj) * v_ice(ji,jj) + u_iceV(ji,jj) * u_iceV(ji,jj) ) |
---|
486 | zTauB = ztauy_base(ji,jj) / zvel |
---|
487 | ! !--- OceanBottom-to-Ice stress |
---|
488 | ztauy_bi(ji,jj) = zTauB * v_ice(ji,jj) |
---|
489 | ! |
---|
490 | ! !--- Coriolis at V-points (energy conserving formulation) |
---|
491 | zCorV(ji,jj) = - 0.25_wp * r1_e2v(ji,jj) * & |
---|
492 | & ( zmf(ji,jj ) * ( e2u(ji,jj ) * u_ice(ji,jj ) + e2u(ji-1,jj ) * u_ice(ji-1,jj ) ) & |
---|
493 | & + zmf(ji,jj+1) * ( e2u(ji,jj+1) * u_ice(ji,jj+1) + e2u(ji-1,jj+1) * u_ice(ji-1,jj+1) ) ) |
---|
494 | ! |
---|
495 | ! !--- Sum of external forces (explicit solution) = F + tau_ia + Coriolis + spg + tau_io |
---|
496 | zTauE = zfV(ji,jj) + ztauy_ai(ji,jj) + zCorV(ji,jj) + zspgV(ji,jj) + ztauy_oi(ji,jj) |
---|
497 | ! |
---|
498 | ! !--- landfast switch => 0 = static friction ; 1 = sliding friction |
---|
499 | rswitch = 1._wp - MIN( 1._wp, ABS( SIGN( 1._wp, ztauE + ztauy_base(ji,jj) ) - SIGN( 1._wp, zTauE ) ) ) |
---|
500 | ! |
---|
501 | IF( ln_aEVP ) THEN !--- ice velocity using aEVP (Kimmritz et al 2016 & 2017) |
---|
502 | v_ice(ji,jj) = ( ( rswitch * ( zmV_t(ji,jj) * ( zbeta(ji,jj) * v_ice(ji,jj) + v_ice_b(ji,jj) ) & ! previous velocity |
---|
503 | & + zTauE + zTauO * v_ice(ji,jj) ) & ! F + tau_ia + Coriolis + spg + tau_io(only ocean part) |
---|
504 | & / MAX( zepsi, zmV_t(ji,jj) * ( zbeta(ji,jj) + 1._wp ) + zTauO - zTauB ) & ! m/dt + tau_io(only ice part) + landfast |
---|
505 | & + ( 1._wp - rswitch ) * v_ice(ji,jj) * MAX( 0._wp, 1._wp - zdtevp * rn_lfrelax ) & ! static friction => slow decrease to v=0 |
---|
506 | & ) * zmsk01y(ji,jj) + v_oce(ji,jj) * 0.01_wp * ( 1._wp - zmsk01y(ji,jj) ) & ! v_ice = v_oce/100 if mass < zmmin & conc < zamin |
---|
507 | & ) * zmsk00y(ji,jj) |
---|
508 | ELSE !--- ice velocity using EVP implicit formulation (cf Madec doc & Bouillon 2009) |
---|
509 | v_ice(ji,jj) = ( ( rswitch * ( zmV_t(ji,jj) * v_ice(ji,jj) & ! previous velocity |
---|
510 | & + zTauE + zTauO * v_ice(ji,jj) ) & ! F + tau_ia + Coriolis + spg + tau_io(only ocean part) |
---|
511 | & / MAX( zepsi, zmV_t(ji,jj) + zTauO - zTauB ) & ! m/dt + tau_io(only ice part) + landfast |
---|
512 | & + ( 1._wp - rswitch ) * v_ice(ji,jj) * MAX( 0._wp, 1._wp - zdtevp * rn_lfrelax ) & ! static friction => slow decrease to v=0 |
---|
513 | & ) * zmsk01y(ji,jj) + v_oce(ji,jj) * 0.01_wp * ( 1._wp - zmsk01y(ji,jj) ) & ! v_ice = v_oce/100 if mass < zmmin & conc < zamin |
---|
514 | & ) * zmsk00y(ji,jj) |
---|
515 | ENDIF |
---|
516 | END DO |
---|
517 | END DO |
---|
518 | CALL lbc_lnk( 'icedyn_rhg_evp', v_ice, 'V', -1. ) |
---|
519 | ! |
---|
520 | #if defined key_agrif |
---|
521 | !! CALL agrif_interp_ice( 'V', jter, nn_nevp ) |
---|
522 | CALL agrif_interp_ice( 'V' ) |
---|
523 | #endif |
---|
524 | IF( ln_bdy ) CALL bdy_ice_dyn( 'V' ) |
---|
525 | ! |
---|
526 | DO jj = 2, jpjm1 |
---|
527 | DO ji = fs_2, fs_jpim1 |
---|
528 | ! !--- tau_io/(u_oce - u_ice) |
---|
529 | zTauO = zaU(ji,jj) * zrhoco * SQRT( ( u_ice (ji,jj) - u_oce (ji,jj) ) * ( u_ice (ji,jj) - u_oce (ji,jj) ) & |
---|
530 | & + ( v_iceU(ji,jj) - v_oceU(ji,jj) ) * ( v_iceU(ji,jj) - v_oceU(ji,jj) ) ) |
---|
531 | ! !--- Ocean-to-Ice stress |
---|
532 | ztaux_oi(ji,jj) = zTauO * ( u_oce(ji,jj) - u_ice(ji,jj) ) |
---|
533 | ! |
---|
534 | ! !--- tau_bottom/u_ice |
---|
535 | zvel = 5.e-05_wp + SQRT( v_iceU(ji,jj) * v_iceU(ji,jj) + u_ice(ji,jj) * u_ice(ji,jj) ) |
---|
536 | zTauB = ztaux_base(ji,jj) / zvel |
---|
537 | ! !--- OceanBottom-to-Ice stress |
---|
538 | ztaux_bi(ji,jj) = zTauB * u_ice(ji,jj) |
---|
539 | ! |
---|
540 | ! !--- Coriolis at U-points (energy conserving formulation) |
---|
541 | zCorU(ji,jj) = 0.25_wp * r1_e1u(ji,jj) * & |
---|
542 | & ( zmf(ji ,jj) * ( e1v(ji ,jj) * v_ice(ji ,jj) + e1v(ji ,jj-1) * v_ice(ji ,jj-1) ) & |
---|
543 | & + zmf(ji+1,jj) * ( e1v(ji+1,jj) * v_ice(ji+1,jj) + e1v(ji+1,jj-1) * v_ice(ji+1,jj-1) ) ) |
---|
544 | ! |
---|
545 | ! !--- Sum of external forces (explicit solution) = F + tau_ia + Coriolis + spg + tau_io |
---|
546 | zTauE = zfU(ji,jj) + ztaux_ai(ji,jj) + zCorU(ji,jj) + zspgU(ji,jj) + ztaux_oi(ji,jj) |
---|
547 | ! |
---|
548 | ! !--- landfast switch => 0 = static friction ; 1 = sliding friction |
---|
549 | rswitch = 1._wp - MIN( 1._wp, ABS( SIGN( 1._wp, ztauE + ztaux_base(ji,jj) ) - SIGN( 1._wp, zTauE ) ) ) |
---|
550 | ! |
---|
551 | IF( ln_aEVP ) THEN !--- ice velocity using aEVP (Kimmritz et al 2016 & 2017) |
---|
552 | u_ice(ji,jj) = ( ( rswitch * ( zmU_t(ji,jj) * ( zbeta(ji,jj) * u_ice(ji,jj) + u_ice_b(ji,jj) ) & ! previous velocity |
---|
553 | & + zTauE + zTauO * u_ice(ji,jj) ) & ! F + tau_ia + Coriolis + spg + tau_io(only ocean part) |
---|
554 | & / MAX( zepsi, zmU_t(ji,jj) * ( zbeta(ji,jj) + 1._wp ) + zTauO - zTauB ) & ! m/dt + tau_io(only ice part) + landfast |
---|
555 | & + ( 1._wp - rswitch ) * u_ice(ji,jj) * MAX( 0._wp, 1._wp - zdtevp * rn_lfrelax ) & ! static friction => slow decrease to v=0 |
---|
556 | & ) * zmsk01x(ji,jj) + u_oce(ji,jj) * 0.01_wp * ( 1._wp - zmsk01x(ji,jj) ) & ! v_ice = v_oce/100 if mass < zmmin & conc < zamin |
---|
557 | & ) * zmsk00x(ji,jj) |
---|
558 | ELSE !--- ice velocity using EVP implicit formulation (cf Madec doc & Bouillon 2009) |
---|
559 | u_ice(ji,jj) = ( ( rswitch * ( zmU_t(ji,jj) * u_ice(ji,jj) & ! previous velocity |
---|
560 | & + zTauE + zTauO * u_ice(ji,jj) ) & ! F + tau_ia + Coriolis + spg + tau_io(only ocean part) |
---|
561 | & / MAX( zepsi, zmU_t(ji,jj) + zTauO - zTauB ) & ! m/dt + tau_io(only ice part) + landfast |
---|
562 | & + ( 1._wp - rswitch ) * u_ice(ji,jj) * MAX( 0._wp, 1._wp - zdtevp * rn_lfrelax ) & ! static friction => slow decrease to v=0 |
---|
563 | & ) * zmsk01x(ji,jj) + u_oce(ji,jj) * 0.01_wp * ( 1._wp - zmsk01x(ji,jj) ) & ! v_ice = v_oce/100 if mass < zmmin & conc < zamin |
---|
564 | & ) * zmsk00x(ji,jj) |
---|
565 | ENDIF |
---|
566 | END DO |
---|
567 | END DO |
---|
568 | CALL lbc_lnk( 'icedyn_rhg_evp', u_ice, 'U', -1. ) |
---|
569 | ! |
---|
570 | #if defined key_agrif |
---|
571 | !! CALL agrif_interp_ice( 'U', jter, nn_nevp ) |
---|
572 | CALL agrif_interp_ice( 'U' ) |
---|
573 | #endif |
---|
574 | IF( ln_bdy ) CALL bdy_ice_dyn( 'U' ) |
---|
575 | ! |
---|
576 | ELSE ! odd iterations |
---|
577 | ! |
---|
578 | DO jj = 2, jpjm1 |
---|
579 | DO ji = fs_2, fs_jpim1 |
---|
580 | ! !--- tau_io/(u_oce - u_ice) |
---|
581 | zTauO = zaU(ji,jj) * zrhoco * SQRT( ( u_ice (ji,jj) - u_oce (ji,jj) ) * ( u_ice (ji,jj) - u_oce (ji,jj) ) & |
---|
582 | & + ( v_iceU(ji,jj) - v_oceU(ji,jj) ) * ( v_iceU(ji,jj) - v_oceU(ji,jj) ) ) |
---|
583 | ! !--- Ocean-to-Ice stress |
---|
584 | ztaux_oi(ji,jj) = zTauO * ( u_oce(ji,jj) - u_ice(ji,jj) ) |
---|
585 | ! |
---|
586 | ! !--- tau_bottom/u_ice |
---|
587 | zvel = 5.e-05_wp + SQRT( v_iceU(ji,jj) * v_iceU(ji,jj) + u_ice(ji,jj) * u_ice(ji,jj) ) |
---|
588 | zTauB = ztaux_base(ji,jj) / zvel |
---|
589 | ! !--- OceanBottom-to-Ice stress |
---|
590 | ztaux_bi(ji,jj) = zTauB * u_ice(ji,jj) |
---|
591 | ! |
---|
592 | ! !--- Coriolis at U-points (energy conserving formulation) |
---|
593 | zCorU(ji,jj) = 0.25_wp * r1_e1u(ji,jj) * & |
---|
594 | & ( zmf(ji ,jj) * ( e1v(ji ,jj) * v_ice(ji ,jj) + e1v(ji ,jj-1) * v_ice(ji ,jj-1) ) & |
---|
595 | & + zmf(ji+1,jj) * ( e1v(ji+1,jj) * v_ice(ji+1,jj) + e1v(ji+1,jj-1) * v_ice(ji+1,jj-1) ) ) |
---|
596 | ! |
---|
597 | ! !--- Sum of external forces (explicit solution) = F + tau_ia + Coriolis + spg + tau_io |
---|
598 | zTauE = zfU(ji,jj) + ztaux_ai(ji,jj) + zCorU(ji,jj) + zspgU(ji,jj) + ztaux_oi(ji,jj) |
---|
599 | ! |
---|
600 | ! !--- landfast switch => 0 = static friction ; 1 = sliding friction |
---|
601 | rswitch = 1._wp - MIN( 1._wp, ABS( SIGN( 1._wp, ztauE + ztaux_base(ji,jj) ) - SIGN( 1._wp, zTauE ) ) ) |
---|
602 | ! |
---|
603 | IF( ln_aEVP ) THEN !--- ice velocity using aEVP (Kimmritz et al 2016 & 2017) |
---|
604 | u_ice(ji,jj) = ( ( rswitch * ( zmU_t(ji,jj) * ( zbeta(ji,jj) * u_ice(ji,jj) + u_ice_b(ji,jj) ) & ! previous velocity |
---|
605 | & + zTauE + zTauO * u_ice(ji,jj) ) & ! F + tau_ia + Coriolis + spg + tau_io(only ocean part) |
---|
606 | & / MAX( zepsi, zmU_t(ji,jj) * ( zbeta(ji,jj) + 1._wp ) + zTauO - zTauB ) & ! m/dt + tau_io(only ice part) + landfast |
---|
607 | & + ( 1._wp - rswitch ) * u_ice(ji,jj) * MAX( 0._wp, 1._wp - zdtevp * rn_lfrelax ) & ! static friction => slow decrease to v=0 |
---|
608 | & ) * zmsk01x(ji,jj) + u_oce(ji,jj) * 0.01_wp * ( 1._wp - zmsk01x(ji,jj) ) & ! v_ice = v_oce/100 if mass < zmmin & conc < zamin |
---|
609 | & ) * zmsk00x(ji,jj) |
---|
610 | ELSE !--- ice velocity using EVP implicit formulation (cf Madec doc & Bouillon 2009) |
---|
611 | u_ice(ji,jj) = ( ( rswitch * ( zmU_t(ji,jj) * u_ice(ji,jj) & ! previous velocity |
---|
612 | & + zTauE + zTauO * u_ice(ji,jj) ) & ! F + tau_ia + Coriolis + spg + tau_io(only ocean part) |
---|
613 | & / MAX( zepsi, zmU_t(ji,jj) + zTauO - zTauB ) & ! m/dt + tau_io(only ice part) + landfast |
---|
614 | & + ( 1._wp - rswitch ) * u_ice(ji,jj) * MAX( 0._wp, 1._wp - zdtevp * rn_lfrelax ) & ! static friction => slow decrease to v=0 |
---|
615 | & ) * zmsk01x(ji,jj) + u_oce(ji,jj) * 0.01_wp * ( 1._wp - zmsk01x(ji,jj) ) & ! v_ice = v_oce/100 if mass < zmmin & conc < zamin |
---|
616 | & ) * zmsk00x(ji,jj) |
---|
617 | ENDIF |
---|
618 | END DO |
---|
619 | END DO |
---|
620 | CALL lbc_lnk( 'icedyn_rhg_evp', u_ice, 'U', -1. ) |
---|
621 | ! |
---|
622 | #if defined key_agrif |
---|
623 | !! CALL agrif_interp_ice( 'U', jter, nn_nevp ) |
---|
624 | CALL agrif_interp_ice( 'U' ) |
---|
625 | #endif |
---|
626 | IF( ln_bdy ) CALL bdy_ice_dyn( 'U' ) |
---|
627 | ! |
---|
628 | DO jj = 2, jpjm1 |
---|
629 | DO ji = fs_2, fs_jpim1 |
---|
630 | ! !--- tau_io/(v_oce - v_ice) |
---|
631 | zTauO = zaV(ji,jj) * zrhoco * SQRT( ( v_ice (ji,jj) - v_oce (ji,jj) ) * ( v_ice (ji,jj) - v_oce (ji,jj) ) & |
---|
632 | & + ( u_iceV(ji,jj) - u_oceV(ji,jj) ) * ( u_iceV(ji,jj) - u_oceV(ji,jj) ) ) |
---|
633 | ! !--- Ocean-to-Ice stress |
---|
634 | ztauy_oi(ji,jj) = zTauO * ( v_oce(ji,jj) - v_ice(ji,jj) ) |
---|
635 | ! |
---|
636 | ! !--- tau_bottom/v_ice |
---|
637 | zvel = 5.e-05_wp + SQRT( v_ice(ji,jj) * v_ice(ji,jj) + u_iceV(ji,jj) * u_iceV(ji,jj) ) |
---|
638 | zTauB = ztauy_base(ji,jj) / zvel |
---|
639 | ! !--- OceanBottom-to-Ice stress |
---|
640 | ztauy_bi(ji,jj) = zTauB * v_ice(ji,jj) |
---|
641 | ! |
---|
642 | ! !--- Coriolis at v-points (energy conserving formulation) |
---|
643 | zCorV(ji,jj) = - 0.25_wp * r1_e2v(ji,jj) * & |
---|
644 | & ( zmf(ji,jj ) * ( e2u(ji,jj ) * u_ice(ji,jj ) + e2u(ji-1,jj ) * u_ice(ji-1,jj ) ) & |
---|
645 | & + zmf(ji,jj+1) * ( e2u(ji,jj+1) * u_ice(ji,jj+1) + e2u(ji-1,jj+1) * u_ice(ji-1,jj+1) ) ) |
---|
646 | ! |
---|
647 | ! !--- Sum of external forces (explicit solution) = F + tau_ia + Coriolis + spg + tau_io |
---|
648 | zTauE = zfV(ji,jj) + ztauy_ai(ji,jj) + zCorV(ji,jj) + zspgV(ji,jj) + ztauy_oi(ji,jj) |
---|
649 | ! |
---|
650 | ! !--- landfast switch => 0 = static friction ; 1 = sliding friction |
---|
651 | rswitch = 1._wp - MIN( 1._wp, ABS( SIGN( 1._wp, zTauE + ztauy_base(ji,jj) ) - SIGN( 1._wp, zTauE ) ) ) |
---|
652 | ! |
---|
653 | IF( ln_aEVP ) THEN !--- ice velocity using aEVP (Kimmritz et al 2016 & 2017) |
---|
654 | v_ice(ji,jj) = ( ( rswitch * ( zmV_t(ji,jj) * ( zbeta(ji,jj) * v_ice(ji,jj) + v_ice_b(ji,jj) ) & ! previous velocity |
---|
655 | & + zTauE + zTauO * v_ice(ji,jj) ) & ! F + tau_ia + Coriolis + spg + tau_io(only ocean part) |
---|
656 | & / MAX( zepsi, zmV_t(ji,jj) * ( zbeta(ji,jj) + 1._wp ) + zTauO - zTauB ) & ! m/dt + tau_io(only ice part) + landfast |
---|
657 | & + ( 1._wp - rswitch ) * v_ice(ji,jj) * MAX( 0._wp, 1._wp - zdtevp * rn_lfrelax ) & ! static friction => slow decrease to v=0 |
---|
658 | & ) * zmsk01y(ji,jj) + v_oce(ji,jj) * 0.01_wp * ( 1._wp - zmsk01y(ji,jj) ) & ! v_ice = v_oce/100 if mass < zmmin & conc < zamin |
---|
659 | & ) * zmsk00y(ji,jj) |
---|
660 | ELSE !--- ice velocity using EVP implicit formulation (cf Madec doc & Bouillon 2009) |
---|
661 | v_ice(ji,jj) = ( ( rswitch * ( zmV_t(ji,jj) * v_ice(ji,jj) & ! previous velocity |
---|
662 | & + zTauE + zTauO * v_ice(ji,jj) ) & ! F + tau_ia + Coriolis + spg + tau_io(only ocean part) |
---|
663 | & / MAX( zepsi, zmV_t(ji,jj) + zTauO - zTauB ) & ! m/dt + tau_io(only ice part) + landfast |
---|
664 | & + ( 1._wp - rswitch ) * v_ice(ji,jj) * MAX( 0._wp, 1._wp - zdtevp * rn_lfrelax ) & ! static friction => slow decrease to v=0 |
---|
665 | & ) * zmsk01y(ji,jj) + v_oce(ji,jj) * 0.01_wp * ( 1._wp - zmsk01y(ji,jj) ) & ! v_ice = v_oce/100 if mass < zmmin & conc < zamin |
---|
666 | & ) * zmsk00y(ji,jj) |
---|
667 | ENDIF |
---|
668 | END DO |
---|
669 | END DO |
---|
670 | CALL lbc_lnk( 'icedyn_rhg_evp', v_ice, 'V', -1. ) |
---|
671 | ! |
---|
672 | #if defined key_agrif |
---|
673 | !! CALL agrif_interp_ice( 'V', jter, nn_nevp ) |
---|
674 | CALL agrif_interp_ice( 'V' ) |
---|
675 | #endif |
---|
676 | IF( ln_bdy ) CALL bdy_ice_dyn( 'V' ) |
---|
677 | ! |
---|
678 | ENDIF |
---|
679 | |
---|
680 | !!$ IF(ln_ctl) THEN ! Convergence test |
---|
681 | !!$ DO jj = 2 , jpjm1 |
---|
682 | !!$ zresr(:,jj) = MAX( ABS( u_ice(:,jj) - zu_ice(:,jj) ), ABS( v_ice(:,jj) - zv_ice(:,jj) ) ) |
---|
683 | !!$ END DO |
---|
684 | !!$ zresm = MAXVAL( zresr( 1:jpi, 2:jpjm1 ) ) |
---|
685 | !!$ CALL mpp_max( 'icedyn_rhg_evp', zresm ) ! max over the global domain |
---|
686 | !!$ ENDIF |
---|
687 | ! |
---|
688 | ! ! ==================== ! |
---|
689 | END DO ! end loop over jter ! |
---|
690 | ! ! ==================== ! |
---|
691 | ! |
---|
692 | !------------------------------------------------------------------------------! |
---|
693 | ! 4) Recompute delta, shear and div (inputs for mechanical redistribution) |
---|
694 | !------------------------------------------------------------------------------! |
---|
695 | DO jj = 1, jpjm1 |
---|
696 | DO ji = 1, jpim1 |
---|
697 | |
---|
698 | ! shear at F points |
---|
699 | zds(ji,jj) = ( ( u_ice(ji,jj+1) * r1_e1u(ji,jj+1) - u_ice(ji,jj) * r1_e1u(ji,jj) ) * e1f(ji,jj) * e1f(ji,jj) & |
---|
700 | & + ( v_ice(ji+1,jj) * r1_e2v(ji+1,jj) - v_ice(ji,jj) * r1_e2v(ji,jj) ) * e2f(ji,jj) * e2f(ji,jj) & |
---|
701 | & ) * r1_e1e2f(ji,jj) * zfmask(ji,jj) |
---|
702 | |
---|
703 | END DO |
---|
704 | END DO |
---|
705 | |
---|
706 | DO jj = 2, jpjm1 |
---|
707 | DO ji = 2, jpim1 ! no vector loop |
---|
708 | |
---|
709 | ! tension**2 at T points |
---|
710 | zdt = ( ( u_ice(ji,jj) * r1_e2u(ji,jj) - u_ice(ji-1,jj) * r1_e2u(ji-1,jj) ) * e2t(ji,jj) * e2t(ji,jj) & |
---|
711 | & - ( v_ice(ji,jj) * r1_e1v(ji,jj) - v_ice(ji,jj-1) * r1_e1v(ji,jj-1) ) * e1t(ji,jj) * e1t(ji,jj) & |
---|
712 | & ) * r1_e1e2t(ji,jj) |
---|
713 | zdt2 = zdt * zdt |
---|
714 | |
---|
715 | ! shear**2 at T points (doc eq. A16) |
---|
716 | zds2 = ( zds(ji,jj ) * zds(ji,jj ) * e1e2f(ji,jj ) + zds(ji-1,jj ) * zds(ji-1,jj ) * e1e2f(ji-1,jj ) & |
---|
717 | & + zds(ji,jj-1) * zds(ji,jj-1) * e1e2f(ji,jj-1) + zds(ji-1,jj-1) * zds(ji-1,jj-1) * e1e2f(ji-1,jj-1) & |
---|
718 | & ) * 0.25_wp * r1_e1e2t(ji,jj) |
---|
719 | |
---|
720 | ! shear at T points |
---|
721 | pshear_i(ji,jj) = SQRT( zdt2 + zds2 ) |
---|
722 | |
---|
723 | ! divergence at T points |
---|
724 | pdivu_i(ji,jj) = ( e2u(ji,jj) * u_ice(ji,jj) - e2u(ji-1,jj) * u_ice(ji-1,jj) & |
---|
725 | & + e1v(ji,jj) * v_ice(ji,jj) - e1v(ji,jj-1) * v_ice(ji,jj-1) & |
---|
726 | & ) * r1_e1e2t(ji,jj) |
---|
727 | |
---|
728 | ! delta at T points |
---|
729 | zdelta = SQRT( pdivu_i(ji,jj) * pdivu_i(ji,jj) + ( zdt2 + zds2 ) * z1_ecc2 ) |
---|
730 | rswitch = 1._wp - MAX( 0._wp, SIGN( 1._wp, -zdelta ) ) ! 0 if delta=0 |
---|
731 | pdelta_i(ji,jj) = zdelta + rn_creepl * rswitch |
---|
732 | |
---|
733 | END DO |
---|
734 | END DO |
---|
735 | CALL lbc_lnk_multi( 'icedyn_rhg_evp', pshear_i, 'T', 1., pdivu_i, 'T', 1., pdelta_i, 'T', 1. ) |
---|
736 | |
---|
737 | ! --- Store the stress tensor for the next time step --- ! |
---|
738 | CALL lbc_lnk_multi( 'icedyn_rhg_evp', zs1, 'T', 1., zs2, 'T', 1., zs12, 'F', 1. ) |
---|
739 | pstress1_i (:,:) = zs1 (:,:) |
---|
740 | pstress2_i (:,:) = zs2 (:,:) |
---|
741 | pstress12_i(:,:) = zs12(:,:) |
---|
742 | ! |
---|
743 | |
---|
744 | !------------------------------------------------------------------------------! |
---|
745 | ! 5) diagnostics |
---|
746 | !------------------------------------------------------------------------------! |
---|
747 | DO jj = 1, jpj |
---|
748 | DO ji = 1, jpi |
---|
749 | zmsk00(ji,jj) = MAX( 0._wp , SIGN( 1._wp , at_i(ji,jj) - epsi06 ) ) ! 1 if ice, 0 if no ice |
---|
750 | END DO |
---|
751 | END DO |
---|
752 | |
---|
753 | ! --- ice-ocean, ice-atm. & ice-oceanbottom(landfast) stresses --- ! |
---|
754 | IF( iom_use('utau_oi') .OR. iom_use('vtau_oi') .OR. iom_use('utau_ai') .OR. iom_use('vtau_ai') .OR. & |
---|
755 | & iom_use('utau_bi') .OR. iom_use('vtau_bi') ) THEN |
---|
756 | ! |
---|
757 | CALL lbc_lnk_multi( 'icedyn_rhg_evp', ztaux_oi, 'U', -1., ztauy_oi, 'V', -1., ztaux_ai, 'U', -1., ztauy_ai, 'V', -1., & |
---|
758 | & ztaux_bi, 'U', -1., ztauy_bi, 'V', -1. ) |
---|
759 | ! |
---|
760 | CALL iom_put( 'utau_oi' , ztaux_oi * zmsk00 ) |
---|
761 | CALL iom_put( 'vtau_oi' , ztauy_oi * zmsk00 ) |
---|
762 | CALL iom_put( 'utau_ai' , ztaux_ai * zmsk00 ) |
---|
763 | CALL iom_put( 'vtau_ai' , ztauy_ai * zmsk00 ) |
---|
764 | CALL iom_put( 'utau_bi' , ztaux_bi * zmsk00 ) |
---|
765 | CALL iom_put( 'vtau_bi' , ztauy_bi * zmsk00 ) |
---|
766 | ENDIF |
---|
767 | |
---|
768 | ! --- divergence, shear and strength --- ! |
---|
769 | IF( iom_use('icediv') ) CALL iom_put( 'icediv' , pdivu_i * zmsk00 ) ! divergence |
---|
770 | IF( iom_use('iceshe') ) CALL iom_put( 'iceshe' , pshear_i * zmsk00 ) ! shear |
---|
771 | IF( iom_use('icestr') ) CALL iom_put( 'icestr' , strength * zmsk00 ) ! strength |
---|
772 | |
---|
773 | ! --- stress tensor --- ! |
---|
774 | IF( iom_use('isig1') .OR. iom_use('isig2') .OR. iom_use('isig3') .OR. iom_use('normstr') .OR. iom_use('sheastr') ) THEN |
---|
775 | ! |
---|
776 | ALLOCATE( zsig1(jpi,jpj) , zsig2(jpi,jpj) , zsig3(jpi,jpj) ) |
---|
777 | ! |
---|
778 | DO jj = 2, jpjm1 |
---|
779 | DO ji = 2, jpim1 |
---|
780 | zdum1 = ( zmsk00(ji-1,jj) * pstress12_i(ji-1,jj) + zmsk00(ji ,jj-1) * pstress12_i(ji ,jj-1) + & ! stress12_i at T-point |
---|
781 | & zmsk00(ji ,jj) * pstress12_i(ji ,jj) + zmsk00(ji-1,jj-1) * pstress12_i(ji-1,jj-1) ) & |
---|
782 | & / MAX( 1._wp, zmsk00(ji-1,jj) + zmsk00(ji,jj-1) + zmsk00(ji,jj) + zmsk00(ji-1,jj-1) ) |
---|
783 | |
---|
784 | zshear = SQRT( pstress2_i(ji,jj) * pstress2_i(ji,jj) + 4._wp * zdum1 * zdum1 ) ! shear stress |
---|
785 | |
---|
786 | zdum2 = zmsk00(ji,jj) / MAX( 1._wp, strength(ji,jj) ) |
---|
787 | |
---|
788 | !! zsig1(ji,jj) = 0.5_wp * zdum2 * ( pstress1_i(ji,jj) + zshear ) ! principal stress (y-direction, see Hunke & Dukowicz 2002) |
---|
789 | !! zsig2(ji,jj) = 0.5_wp * zdum2 * ( pstress1_i(ji,jj) - zshear ) ! principal stress (x-direction, see Hunke & Dukowicz 2002) |
---|
790 | !! zsig3(ji,jj) = zdum2**2 * ( ( pstress1_i(ji,jj) + strength(ji,jj) )**2 + ( rn_ecc * zshear )**2 ) ! quadratic relation linking compressive stress to shear stress |
---|
791 | !! ! (scheme converges if this value is ~1, see Bouillon et al 2009 (eq. 11)) |
---|
792 | zsig1(ji,jj) = 0.5_wp * zdum2 * ( pstress1_i(ji,jj) ) ! compressive stress, see Bouillon et al. 2015 |
---|
793 | zsig2(ji,jj) = 0.5_wp * zdum2 * ( zshear ) ! shear stress |
---|
794 | zsig3(ji,jj) = zdum2**2 * ( ( pstress1_i(ji,jj) + strength(ji,jj) )**2 + ( rn_ecc * zshear )**2 ) |
---|
795 | END DO |
---|
796 | END DO |
---|
797 | CALL lbc_lnk_multi( 'icedyn_rhg_evp', zsig1, 'T', 1., zsig2, 'T', 1., zsig3, 'T', 1. ) |
---|
798 | ! |
---|
799 | CALL iom_put( 'isig1' , zsig1 ) |
---|
800 | CALL iom_put( 'isig2' , zsig2 ) |
---|
801 | CALL iom_put( 'isig3' , zsig3 ) |
---|
802 | ! |
---|
803 | ! Stress tensor invariants (normal and shear stress N/m) |
---|
804 | IF( iom_use('normstr') ) CALL iom_put( 'normstr' , ( zs1(:,:) + zs2(:,:) ) * zmsk00(:,:) ) ! Normal stress |
---|
805 | IF( iom_use('sheastr') ) CALL iom_put( 'sheastr' , SQRT( ( zs1(:,:) - zs2(:,:) )**2 + 4*zs12(:,:)**2 ) * zmsk00(:,:) ) ! Shear stress |
---|
806 | |
---|
807 | DEALLOCATE( zsig1 , zsig2 , zsig3 ) |
---|
808 | ENDIF |
---|
809 | |
---|
810 | ! --- SIMIP --- ! |
---|
811 | IF( iom_use('dssh_dx') .OR. iom_use('dssh_dy') .OR. & |
---|
812 | & iom_use('corstrx') .OR. iom_use('corstry') .OR. iom_use('intstrx') .OR. iom_use('intstry') ) THEN |
---|
813 | ! |
---|
814 | CALL lbc_lnk_multi( 'icedyn_rhg_evp', zspgU, 'U', -1., zspgV, 'V', -1., & |
---|
815 | & zCorU, 'U', -1., zCorV, 'V', -1., zfU, 'U', -1., zfV, 'V', -1. ) |
---|
816 | |
---|
817 | CALL iom_put( 'dssh_dx' , zspgU * zmsk00 ) ! Sea-surface tilt term in force balance (x) |
---|
818 | CALL iom_put( 'dssh_dy' , zspgV * zmsk00 ) ! Sea-surface tilt term in force balance (y) |
---|
819 | CALL iom_put( 'corstrx' , zCorU * zmsk00 ) ! Coriolis force term in force balance (x) |
---|
820 | CALL iom_put( 'corstry' , zCorV * zmsk00 ) ! Coriolis force term in force balance (y) |
---|
821 | CALL iom_put( 'intstrx' , zfU * zmsk00 ) ! Internal force term in force balance (x) |
---|
822 | CALL iom_put( 'intstry' , zfV * zmsk00 ) ! Internal force term in force balance (y) |
---|
823 | ENDIF |
---|
824 | |
---|
825 | IF( iom_use('xmtrpice') .OR. iom_use('ymtrpice') .OR. & |
---|
826 | & iom_use('xmtrpsnw') .OR. iom_use('ymtrpsnw') .OR. iom_use('xatrp') .OR. iom_use('yatrp') ) THEN |
---|
827 | ! |
---|
828 | ALLOCATE( zdiag_xmtrp_ice(jpi,jpj) , zdiag_ymtrp_ice(jpi,jpj) , & |
---|
829 | & zdiag_xmtrp_snw(jpi,jpj) , zdiag_ymtrp_snw(jpi,jpj) , zdiag_xatrp(jpi,jpj) , zdiag_yatrp(jpi,jpj) ) |
---|
830 | ! |
---|
831 | DO jj = 2, jpjm1 |
---|
832 | DO ji = 2, jpim1 |
---|
833 | ! 2D ice mass, snow mass, area transport arrays (X, Y) |
---|
834 | zfac_x = 0.5 * u_ice(ji,jj) * e2u(ji,jj) * zmsk00(ji,jj) |
---|
835 | zfac_y = 0.5 * v_ice(ji,jj) * e1v(ji,jj) * zmsk00(ji,jj) |
---|
836 | |
---|
837 | zdiag_xmtrp_ice(ji,jj) = rhoi * zfac_x * ( vt_i(ji+1,jj) + vt_i(ji,jj) ) ! ice mass transport, X-component |
---|
838 | zdiag_ymtrp_ice(ji,jj) = rhoi * zfac_y * ( vt_i(ji,jj+1) + vt_i(ji,jj) ) ! '' Y- '' |
---|
839 | |
---|
840 | zdiag_xmtrp_snw(ji,jj) = rhos * zfac_x * ( vt_s(ji+1,jj) + vt_s(ji,jj) ) ! snow mass transport, X-component |
---|
841 | zdiag_ymtrp_snw(ji,jj) = rhos * zfac_y * ( vt_s(ji,jj+1) + vt_s(ji,jj) ) ! '' Y- '' |
---|
842 | |
---|
843 | zdiag_xatrp(ji,jj) = zfac_x * ( at_i(ji+1,jj) + at_i(ji,jj) ) ! area transport, X-component |
---|
844 | zdiag_yatrp(ji,jj) = zfac_y * ( at_i(ji,jj+1) + at_i(ji,jj) ) ! '' Y- '' |
---|
845 | |
---|
846 | END DO |
---|
847 | END DO |
---|
848 | |
---|
849 | CALL lbc_lnk_multi( 'icedyn_rhg_evp', zdiag_xmtrp_ice, 'U', -1., zdiag_ymtrp_ice, 'V', -1., & |
---|
850 | & zdiag_xmtrp_snw, 'U', -1., zdiag_ymtrp_snw, 'V', -1., & |
---|
851 | & zdiag_xatrp , 'U', -1., zdiag_yatrp , 'V', -1. ) |
---|
852 | |
---|
853 | CALL iom_put( 'xmtrpice' , zdiag_xmtrp_ice ) ! X-component of sea-ice mass transport (kg/s) |
---|
854 | CALL iom_put( 'ymtrpice' , zdiag_ymtrp_ice ) ! Y-component of sea-ice mass transport |
---|
855 | CALL iom_put( 'xmtrpsnw' , zdiag_xmtrp_snw ) ! X-component of snow mass transport (kg/s) |
---|
856 | CALL iom_put( 'ymtrpsnw' , zdiag_ymtrp_snw ) ! Y-component of snow mass transport |
---|
857 | CALL iom_put( 'xatrp' , zdiag_xatrp ) ! X-component of ice area transport |
---|
858 | CALL iom_put( 'yatrp' , zdiag_yatrp ) ! Y-component of ice area transport |
---|
859 | |
---|
860 | DEALLOCATE( zdiag_xmtrp_ice , zdiag_ymtrp_ice , & |
---|
861 | & zdiag_xmtrp_snw , zdiag_ymtrp_snw , zdiag_xatrp , zdiag_yatrp ) |
---|
862 | |
---|
863 | ENDIF |
---|
864 | ! |
---|
865 | END SUBROUTINE ice_dyn_rhg_evp |
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866 | |
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867 | |
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868 | SUBROUTINE rhg_evp_rst( cdrw, kt ) |
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869 | !!--------------------------------------------------------------------- |
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870 | !! *** ROUTINE rhg_evp_rst *** |
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871 | !! |
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872 | !! ** Purpose : Read or write RHG file in restart file |
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873 | !! |
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874 | !! ** Method : use of IOM library |
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875 | !!---------------------------------------------------------------------- |
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876 | CHARACTER(len=*) , INTENT(in) :: cdrw ! "READ"/"WRITE" flag |
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877 | INTEGER, OPTIONAL, INTENT(in) :: kt ! ice time-step |
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878 | ! |
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879 | INTEGER :: iter ! local integer |
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880 | INTEGER :: id1, id2, id3 ! local integers |
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881 | !!---------------------------------------------------------------------- |
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882 | ! |
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883 | IF( TRIM(cdrw) == 'READ' ) THEN ! Read/initialize |
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884 | ! ! --------------- |
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885 | IF( ln_rstart ) THEN !* Read the restart file |
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886 | ! |
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887 | id1 = iom_varid( numrir, 'stress1_i' , ldstop = .FALSE. ) |
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888 | id2 = iom_varid( numrir, 'stress2_i' , ldstop = .FALSE. ) |
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889 | id3 = iom_varid( numrir, 'stress12_i', ldstop = .FALSE. ) |
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890 | ! |
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891 | IF( MIN( id1, id2, id3 ) > 0 ) THEN ! fields exist |
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892 | CALL iom_get( numrir, jpdom_autoglo, 'stress1_i' , stress1_i ) |
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893 | CALL iom_get( numrir, jpdom_autoglo, 'stress2_i' , stress2_i ) |
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894 | CALL iom_get( numrir, jpdom_autoglo, 'stress12_i', stress12_i ) |
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895 | ELSE ! start rheology from rest |
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896 | IF(lwp) WRITE(numout,*) |
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897 | IF(lwp) WRITE(numout,*) ' ==>>> previous run without rheology, set stresses to 0' |
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898 | stress1_i (:,:) = 0._wp |
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899 | stress2_i (:,:) = 0._wp |
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900 | stress12_i(:,:) = 0._wp |
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901 | ENDIF |
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902 | ELSE !* Start from rest |
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903 | IF(lwp) WRITE(numout,*) |
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904 | IF(lwp) WRITE(numout,*) ' ==>>> start from rest: set stresses to 0' |
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905 | stress1_i (:,:) = 0._wp |
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906 | stress2_i (:,:) = 0._wp |
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907 | stress12_i(:,:) = 0._wp |
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908 | ENDIF |
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909 | ! |
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910 | ELSEIF( TRIM(cdrw) == 'WRITE' ) THEN ! Create restart file |
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911 | ! ! ------------------- |
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912 | IF(lwp) WRITE(numout,*) '---- rhg-rst ----' |
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913 | iter = kt + nn_fsbc - 1 ! ice restarts are written at kt == nitrst - nn_fsbc + 1 |
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914 | ! |
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915 | CALL iom_rstput( iter, nitrst, numriw, 'stress1_i' , stress1_i ) |
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916 | CALL iom_rstput( iter, nitrst, numriw, 'stress2_i' , stress2_i ) |
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917 | CALL iom_rstput( iter, nitrst, numriw, 'stress12_i', stress12_i ) |
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918 | ! |
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919 | ENDIF |
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920 | ! |
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921 | END SUBROUTINE rhg_evp_rst |
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922 | |
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923 | #else |
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924 | !!---------------------------------------------------------------------- |
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925 | !! Default option Empty module NO SI3 sea-ice model |
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926 | !!---------------------------------------------------------------------- |
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927 | #endif |
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928 | |
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929 | !!============================================================================== |
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930 | END MODULE icedyn_rhg_evp |
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