1 | !!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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2 | !! SI3 namelist: |
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3 | !! 1 - Generic parameters (nampar) |
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4 | !! 2 - Ice thickness discretization (namitd) |
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5 | !! 3 - Ice dynamics (namdyn) |
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6 | !! 4 - Ice ridging/rafting (namdyn_rdgrft) |
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7 | !! 5 - Ice rheology (namdyn_rhg) |
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8 | !! 6 - Ice advection (namdyn_adv) |
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9 | !! 7 - Ice surface forcing (namforcing) |
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10 | !! 8 - Ice thermodynamics (namthd) |
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11 | !! 9 - Ice heat diffusion (namthd_zdf) |
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12 | !! 10 - Ice lateral melting (namthd_da) |
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13 | !! 11 - Ice growth in open water (namthd_do) |
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14 | !! 12 - Ice salinity (namthd_sal) |
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15 | !! 13 - Ice melt ponds (namthd_pnd) |
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16 | !! 14 - Ice initialization (namini) |
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17 | !! 15 - Ice/snow albedos (namalb) |
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18 | !! 16 - Ice diagnostics (namdia) |
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19 | !!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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20 | ! |
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21 | !------------------------------------------------------------------------------ |
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22 | &nampar ! Generic parameters |
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23 | !------------------------------------------------------------------------------ |
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24 | jpl = 5 ! number of ice categories |
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25 | nlay_i = 2 ! number of ice layers |
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26 | nlay_s = 1 ! number of snow layers (only 1 is working) |
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27 | nn_virtual_itd = 0 ! virtual ITD mono-category parameterizations (1-3 => jpl = 1 only) or not (0) |
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28 | ! 2: activate enhanced thermal conductivity only --- temporary option |
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29 | ! 3: activate virtual thin ice melting only --- temporary option |
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30 | ln_icedyn = .true. ! ice dynamics (T) or not (F) |
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31 | ln_icethd = .true. ! ice thermo (T) or not (F) |
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32 | rn_amax_n = 0.997 ! maximum tolerated ice concentration NH |
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33 | rn_amax_s = 0.997 ! maximum tolerated ice concentration SH |
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34 | cn_icerst_in = "restart_ice" ! suffix of ice restart name (input) |
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35 | cn_icerst_out = "restart_ice" ! suffix of ice restart name (output) |
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36 | cn_icerst_indir = "." ! directory to read input ice restarts |
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37 | cn_icerst_outdir = "." ! directory to write output ice restarts |
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38 | / |
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39 | !------------------------------------------------------------------------------ |
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40 | &namitd ! Ice discretization |
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41 | !------------------------------------------------------------------------------ |
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42 | ln_cat_hfn = .true. ! ice categories are defined by a function following rn_himean**(-0.05) |
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43 | rn_himean = 2.0 ! expected domain-average ice thickness (m) |
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44 | ln_cat_usr = .false. ! ice categories are defined by rn_catbnd below (m) |
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45 | rn_catbnd = 0.,0.45,1.1,2.1,3.7,6.0 |
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46 | rn_himin = 0.1 ! minimum ice thickness (m) used in remapping |
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47 | / |
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48 | !------------------------------------------------------------------------------ |
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49 | &namdyn ! Ice dynamics |
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50 | !------------------------------------------------------------------------------ |
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51 | ln_dynFULL = .true. ! dyn.: full ice dynamics (rheology + advection + ridging/rafting + correction) |
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52 | ln_dynRHGADV = .false. ! dyn.: no ridge/raft & no corrections (rheology + advection) |
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53 | ln_dynADV = .false. ! dyn.: only advection w prescribed vel.(rn_uvice + advection) |
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54 | rn_uice = 0.00001 ! prescribed ice u-velocity |
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55 | rn_vice = 0. ! prescribed ice v-velocity |
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56 | rn_ishlat = 2. ! free slip (0) ; partial slip (0-2) ; no slip (2) ; strong slip (>2) |
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57 | ln_landfast = .false. ! landfast ice parameterization (T or F) |
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58 | rn_gamma = 0.15 ! fraction of ocean depth that ice must reach to initiate landfast |
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59 | ! recommended range: [0.1 ; 0.25] |
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60 | rn_icebfr = 10. ! maximum bottom stress per unit area of contact [N/m2] |
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61 | ! a very large value ensures ice velocity=0 even with a small contact area |
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62 | ! recommended range: ?? (should be greater than atm-ice stress => >0.1 N/m2) |
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63 | rn_lfrelax = 1.e-5 ! relaxation time scale to reach static friction [s-1] |
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64 | / |
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65 | !------------------------------------------------------------------------------ |
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66 | &namdyn_rdgrft ! Ice ridging/rafting |
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67 | !------------------------------------------------------------------------------ |
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68 | ! -- ice_rdgrft_strength -- ! |
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69 | ln_str_H79 = .true. ! ice strength param.: Hibler_79 => P = pstar*<h>*exp(-c_rhg*A) |
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70 | rn_pstar = 2.0e+04 ! ice strength thickness parameter [N/m2] |
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71 | rn_crhg = 20.0 ! ice strength conc. parameter (-) |
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72 | ! -- ice_rdgrft -- ! |
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73 | rn_csrdg = 0.5 ! fraction of shearing energy contributing to ridging |
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74 | ! -- ice_rdgrft_prep -- ! |
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75 | ln_partf_lin = .false. ! Linear ridging participation function (Thorndike et al, 1975) |
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76 | rn_gstar = 0.15 ! fractional area of thin ice being ridged |
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77 | ln_partf_exp = .true. ! Exponential ridging participation function (Lipscomb, 2007) |
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78 | rn_astar = 0.03 ! exponential measure of ridging ice fraction [set to 0.05 if hstar=100] |
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79 | ln_ridging = .true. ! ridging activated (T) or not (F) |
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80 | rn_hstar = 25.0 ! determines the maximum thickness of ridged ice [m] (Hibler, 1980) |
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81 | rn_porordg = 0.3 ! porosity of newly ridged ice (Lepparanta et al., 1995) |
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82 | rn_fsnwrdg = 0.5 ! snow volume fraction that survives in ridging |
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83 | rn_fpndrdg = 1.0 ! pond fraction that survives in ridging (small a priori) |
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84 | ln_rafting = .true. ! rafting activated (T) or not (F) |
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85 | rn_hraft = 0.75 ! threshold thickness for rafting [m] |
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86 | rn_craft = 5.0 ! squeezing coefficient used in the rafting function |
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87 | rn_fsnwrft = 0.5 ! snow volume fraction that survives in rafting |
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88 | rn_fpndrft = 1.0 ! pond fraction that survives in rafting (0.5 a priori) |
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89 | / |
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90 | !------------------------------------------------------------------------------ |
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91 | &namdyn_rhg ! Ice rheology |
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92 | !------------------------------------------------------------------------------ |
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93 | ln_rhg_EVP = .true. ! EVP rheology |
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94 | ln_aEVP = .false. ! adaptive rheology (Kimmritz et al. 2016 & 2017) |
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95 | rn_creepl = 2.0e-9 ! creep limit [1/s] |
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96 | rn_ecc = 2.0 ! eccentricity of the elliptical yield curve |
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97 | nn_nevp = 120 ! number of EVP subcycles |
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98 | rn_relast = 0.333 ! ratio of elastic timescale to ice time step: Telast = dt_ice * rn_relast |
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99 | ! advised value: 1/3 (rn_nevp=120) or 1/9 (rn_nevp=300) |
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100 | / |
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101 | !------------------------------------------------------------------------------ |
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102 | &namdyn_adv ! Ice advection |
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103 | !------------------------------------------------------------------------------ |
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104 | ln_adv_Pra = .false. ! Advection scheme (Prather) |
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105 | ln_adv_UMx = .true. ! Advection scheme (Ultimate-Macho) |
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106 | nn_UMx = 5 ! order of the scheme for UMx (1-5 ; 20=centered 2nd order) |
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107 | / |
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108 | !------------------------------------------------------------------------------ |
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109 | &namforcing ! Ice surface forcing |
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110 | !------------------------------------------------------------------------------ |
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111 | rn_cio = 5.0e-03 ! ice-ocean drag coefficient (-) |
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112 | rn_blow_s = 0.66 ! mesure of snow blowing into the leads |
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113 | ! = 1 => no snow blowing, < 1 => some snow blowing |
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114 | nn_flxdist = -1 ! Redistribute heat flux over ice categories |
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115 | ! =-1 Do nothing (needs N(cat) fluxes) |
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116 | ! = 0 Average N(cat) fluxes then apply the average over the N(cat) ice |
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117 | ! = 1 Average N(cat) fluxes then redistribute over the N(cat) ice using T-ice and albedo sensitivity |
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118 | ! = 2 Redistribute a single flux over categories |
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119 | nice_jules = 0 ! Jules coupling (0=OFF, 1=EMULATED, 2=ACTIVE) |
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120 | / |
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121 | !------------------------------------------------------------------------------ |
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122 | &namthd ! Ice thermodynamics |
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123 | !------------------------------------------------------------------------------ |
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124 | ln_icedH = .true. ! activate ice thickness change from growing/melting (T) or not (F) |
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125 | ln_icedA = .true. ! activate lateral melting param. (T) or not (F) |
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126 | ln_icedO = .true. ! activate ice growth in open-water (T) or not (F) |
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127 | ln_icedS = .true. ! activate brine drainage (T) or not (F) |
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128 | / |
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129 | !------------------------------------------------------------------------------ |
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130 | &namthd_zdf ! Ice heat diffusion |
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131 | !------------------------------------------------------------------------------ |
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132 | ln_zdf_BL99 = .true. ! Heat diffusion follows Bitz and Lipscomb 1999 |
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133 | ln_cndi_U64 = .false. ! sea ice thermal conductivity: k = k0 + beta.S/T (Untersteiner, 1964) |
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134 | ln_cndi_P07 = .true. ! sea ice thermal conductivity: k = k0 + beta1.S/T - beta2.T (Pringle et al., 2007) |
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135 | rn_cnd_s = 0.31 ! thermal conductivity of the snow (0.31 W/m/K, Maykut and Untersteiner, 1971) |
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136 | ! Obs: 0.1-0.5 (Lecomte et al, JAMES 2013) |
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137 | rn_kappa_i = 1.0 ! radiation attenuation coefficient in sea ice [1/m] |
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138 | / |
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139 | !------------------------------------------------------------------------------ |
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140 | &namthd_da ! Ice lateral melting |
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141 | !------------------------------------------------------------------------------ |
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142 | rn_beta = 1.0 ! coef. beta for lateral melting param. Recommended range=[0.8-1.2] |
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143 | ! => decrease = more melt and melt peaks toward higher concentration (A~0.5 for beta=1 ; A~0.8 for beta=0.2) |
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144 | ! 0.3 = best fit for western Fram Strait and Antarctica |
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145 | ! 1.4 = best fit for eastern Fram Strait |
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146 | rn_dmin = 8. ! minimum floe diameter for lateral melting param. Recommended range=[6-10] |
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147 | ! => 6 vs 8m = +40% melting at the peak (A~0.5) |
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148 | ! 10 vs 8m = -20% melting |
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149 | / |
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150 | !------------------------------------------------------------------------------ |
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151 | &namthd_do ! Ice growth in open water |
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152 | !------------------------------------------------------------------------------ |
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153 | rn_hinew = 0.1 ! thickness for new ice formation in open water (m), must be larger than rn_hnewice |
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154 | ln_frazil = .false. ! Frazil ice parameterization (ice collection as a function of wind) |
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155 | rn_maxfraz = 1.0 ! maximum fraction of frazil ice collecting at the ice base |
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156 | rn_vfraz = 0.417 ! thresold drift speed for frazil ice collecting at the ice bottom (m/s) |
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157 | rn_Cfraz = 5.0 ! squeezing coefficient for frazil ice collecting at the ice bottom |
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158 | / |
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159 | !------------------------------------------------------------------------------ |
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160 | &namthd_sal ! Ice salinity |
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161 | !------------------------------------------------------------------------------ |
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162 | nn_icesal = 2 ! ice salinity option |
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163 | ! 1: constant ice salinity (S=rn_icesal) |
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164 | ! 2: varying salinity parameterization S(z,t) |
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165 | ! 3: prescribed salinity profile S(z), Schwarzacher, 1959 |
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166 | rn_icesal = 4. ! (nn_icesal=1) ice salinity (g/kg) |
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167 | rn_sal_gd = 5. ! restoring ice salinity, gravity drainage (g/kg) |
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168 | rn_time_gd = 1.73e+6 ! restoring time scale, gravity drainage (s) |
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169 | rn_sal_fl = 2. ! restoring ice salinity, flushing (g/kg) |
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170 | rn_time_fl = 8.64e+5 ! restoring time scale, flushing (s) |
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171 | rn_simax = 20. ! maximum tolerated ice salinity (g/kg) |
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172 | rn_simin = 0.1 ! minimum tolerated ice salinity (g/kg) |
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173 | / |
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174 | !------------------------------------------------------------------------------ |
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175 | &namthd_pnd ! Melt ponds |
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176 | !------------------------------------------------------------------------------ |
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177 | ln_pnd_H12 = .false. ! activate evolutive melt ponds (from Holland et al 2012) |
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178 | ln_pnd_fwb = .false. ! melt ponds store freshwater or not |
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179 | ln_pnd_CST = .false. ! activate constant melt ponds |
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180 | rn_apnd = 0.2 ! prescribed pond fraction, at Tsu=0 |
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181 | rn_hpnd = 0.05 ! prescribed pond depth, at Tsu=0 |
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182 | ln_pnd_alb = .false. ! melt ponds affect albedo or not |
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183 | / |
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184 | !------------------------------------------------------------------------------ |
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185 | &namini ! Ice initialization |
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186 | !------------------------------------------------------------------------------ |
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187 | ln_iceini = .true. ! activate ice initialization (T) or not (F) |
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188 | ln_iceini_file = .false. ! netcdf file provided for initialization (T) or not (F) |
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189 | rn_thres_sst = 2.0 ! max delta temp. above Tfreeze with initial ice = (sst - tfreeze) |
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190 | rn_hts_ini_n = 0.3 ! initial real snow thickness (m), North |
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191 | rn_hts_ini_s = 0.3 ! " " South |
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192 | rn_hti_ini_n = 3.0 ! initial real ice thickness (m), North |
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193 | rn_hti_ini_s = 1.0 ! " " South |
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194 | rn_ati_ini_n = 0.9 ! initial ice concentration (-), North |
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195 | rn_ati_ini_s = 0.9 ! " " South |
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196 | rn_smi_ini_n = 6.3 ! initial ice salinity (g/kg), North |
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197 | rn_smi_ini_s = 6.3 ! " " South |
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198 | rn_tmi_ini_n = 270. ! initial ice/snw temperature (K), North |
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199 | rn_tmi_ini_s = 270. ! " " South |
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200 | |
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201 | sn_hti = 'Ice_initialization' , -12 ,'hti' , .false. , .true., 'yearly' , '' , '', '' |
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202 | sn_hts = 'Ice_initialization' , -12 ,'hts' , .false. , .true., 'yearly' , '' , '', '' |
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203 | sn_ati = 'Ice_initialization' , -12 ,'ati' , .false. , .true., 'yearly' , '' , '', '' |
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204 | sn_tsu = 'Ice_initialization' , -12 ,'tsu' , .false. , .true., 'yearly' , '' , '', '' |
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205 | sn_tmi = 'Ice_initialization' , -12 ,'tmi' , .false. , .true., 'yearly' , '' , '', '' |
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206 | sn_smi = 'Ice_initialization' , -12 ,'smi' , .false. , .true., 'yearly' , '' , '', '' |
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207 | cn_dir='./' |
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208 | / |
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209 | !------------------------------------------------------------------------------ |
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210 | &namalb ! albedo parameters |
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211 | !------------------------------------------------------------------------------ |
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212 | ! ! ! obs range (cloud-sky) |
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213 | rn_alb_sdry = 0.85 ! dry snow albedo : 0.85 -- 0.87 |
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214 | rn_alb_smlt = 0.75 ! melting snow albedo : 0.72 -- 0.82 |
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215 | rn_alb_idry = 0.60 ! dry ice albedo : 0.54 -- 0.65 |
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216 | rn_alb_imlt = 0.50 ! bare puddled ice albedo : 0.49 -- 0.58 |
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217 | rn_alb_dpnd = 0.27 ! ponded ice albedo : 0.10 -- 0.30 |
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218 | / |
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219 | !------------------------------------------------------------------------------ |
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220 | &namdia ! Diagnostics |
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221 | !------------------------------------------------------------------------------ |
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222 | ln_icediachk = .false. ! check online the heat, mass & salt budgets (T) or not (F) |
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223 | ln_icediahsb = .false. ! output the heat, mass & salt budgets (T) or not (F) |
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224 | ln_icectl = .false. ! ice points output for debug (T or F) |
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225 | iiceprt = 10 ! i-index for debug |
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226 | jiceprt = 10 ! j-index for debug |
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227 | / |
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