| 1 | !!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
|---|
| 2 | !! LIM3 namelist: |
|---|
| 3 | !! 1 - Generic parameters (namicerun) |
|---|
| 4 | !! 2 - Diagnostics (namicediag) |
|---|
| 5 | !! 3 - Ice initialization (namiceini) |
|---|
| 6 | !! 4 - Ice discretization (namiceitd) |
|---|
| 7 | !! 5 - Ice dynamics and transport (namicedyn) |
|---|
| 8 | !! 6 - Ice thermodynamics (namicethd) |
|---|
| 9 | !! 7 - Ice salinity (namicesal) |
|---|
| 10 | !! 8 - Ice mechanical redistribution (namiceitdme) |
|---|
| 11 | !! 9 - Ice/snow albedos (namicealb) |
|---|
| 12 | !!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
|---|
| 13 | ! |
|---|
| 14 | !------------------------------------------------------------------------------ |
|---|
| 15 | &namicerun ! Generic parameters |
|---|
| 16 | !------------------------------------------------------------------------------ |
|---|
| 17 | jpl = 5 ! number of ice categories |
|---|
| 18 | nlay_i = 2 ! number of ice layers |
|---|
| 19 | nlay_s = 1 ! number of snow layers (only 1 is working) |
|---|
| 20 | nn_monocat = 0 ! virtual ITD mono-category parameterizations (1-4 => jpl = 1 only) or not (0) |
|---|
| 21 | ! 2: simple piling instead of ridging --- temporary option |
|---|
| 22 | ! 3: activate G(he) only --- temporary option |
|---|
| 23 | ! 4: activate extra lateral melting only --- temporary option |
|---|
| 24 | rn_amax_n = 0.997 ! maximum tolerated ice concentration NH |
|---|
| 25 | rn_amax_s = 0.997 ! maximum tolerated ice concentration SH |
|---|
| 26 | cn_icerst_in = "restart_ice" ! suffix of ice restart name (input) |
|---|
| 27 | cn_icerst_out = "restart_ice" ! suffix of ice restart name (output) |
|---|
| 28 | cn_icerst_indir = "." ! directory to read input ice restarts |
|---|
| 29 | cn_icerst_outdir = "." ! directory to write output ice restarts |
|---|
| 30 | ln_limthd = .true. ! ice thermo (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO |
|---|
| 31 | ln_limdyn = .true. ! ice dynamics (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO |
|---|
| 32 | nn_limdyn = 2 ! (ln_limdyn=T) switch for ice dynamics |
|---|
| 33 | ! 2: total |
|---|
| 34 | ! 1: advection only (no diffusion, no ridging/rafting) |
|---|
| 35 | ! 0: advection only (as 1 but with prescribed velocity, bypass rheology) |
|---|
| 36 | rn_uice = 0.00001 ! (nn_limdyn=0) ice u-velocity |
|---|
| 37 | rn_vice = -0.00001 ! (nn_limdyn=0) ice v-velocity |
|---|
| 38 | / |
|---|
| 39 | !------------------------------------------------------------------------------ |
|---|
| 40 | &namicediag ! Diagnostics |
|---|
| 41 | !------------------------------------------------------------------------------ |
|---|
| 42 | ln_limdiachk = .false. ! check online the heat, mass & salt budgets (T) or not (F) |
|---|
| 43 | ln_limdiahsb = .false. ! output the heat, mass & salt budgets (T) or not (F) |
|---|
| 44 | ln_limctl = .false. ! ice points output for debug (T or F) |
|---|
| 45 | iiceprt = 10 ! i-index for debug |
|---|
| 46 | jiceprt = 10 ! j-index for debug |
|---|
| 47 | / |
|---|
| 48 | !------------------------------------------------------------------------------ |
|---|
| 49 | &namiceini ! Ice initialization |
|---|
| 50 | !------------------------------------------------------------------------------ |
|---|
| 51 | ! -- limistate -- ! |
|---|
| 52 | ln_limini = .true. ! activate ice initialization (T) or not (F) |
|---|
| 53 | ln_limini_file = .false. ! netcdf file provided for initialization (T) or not (F) |
|---|
| 54 | rn_thres_sst = 2.0 ! maximum water temperature with initial ice (degC) |
|---|
| 55 | rn_hts_ini_n = 0.3 ! initial real snow thickness (m), North |
|---|
| 56 | rn_hts_ini_s = 0.3 ! " " South |
|---|
| 57 | rn_hti_ini_n = 3.0 ! initial real ice thickness (m), North |
|---|
| 58 | rn_hti_ini_s = 1.0 ! " " South |
|---|
| 59 | rn_ati_ini_n = 0.9 ! initial ice concentration (-), North |
|---|
| 60 | rn_ati_ini_s = 0.9 ! " " South |
|---|
| 61 | rn_smi_ini_n = 6.3 ! initial ice salinity (g/kg), North |
|---|
| 62 | rn_smi_ini_s = 6.3 ! " " South |
|---|
| 63 | rn_tmi_ini_n = 270. ! initial ice/snw temperature (K), North |
|---|
| 64 | rn_tmi_ini_s = 270. ! " " South |
|---|
| 65 | |
|---|
| 66 | sn_hti = 'Ice_initialization' , -12 ,'hti' , .false. , .true., 'yearly' , '' , '', '' |
|---|
| 67 | sn_hts = 'Ice_initialization' , -12 ,'hts' , .false. , .true., 'yearly' , '' , '', '' |
|---|
| 68 | sn_ati = 'Ice_initialization' , -12 ,'ati' , .false. , .true., 'yearly' , '' , '', '' |
|---|
| 69 | sn_tsu = 'Ice_initialization' , -12 ,'tsu' , .false. , .true., 'yearly' , '' , '', '' |
|---|
| 70 | sn_tmi = 'Ice_initialization' , -12 ,'tmi' , .false. , .true., 'yearly' , '' , '', '' |
|---|
| 71 | sn_smi = 'Ice_initialization' , -12 ,'smi' , .false. , .true., 'yearly' , '' , '', '' |
|---|
| 72 | cn_dir='./' |
|---|
| 73 | / |
|---|
| 74 | !------------------------------------------------------------------------------ |
|---|
| 75 | &namiceitd ! Ice discretization |
|---|
| 76 | !------------------------------------------------------------------------------ |
|---|
| 77 | rn_himean = 2.0 ! expected domain-average ice thickness (m) |
|---|
| 78 | / |
|---|
| 79 | !------------------------------------------------------------------------------ |
|---|
| 80 | &namicedyn ! Ice dynamics and transport |
|---|
| 81 | !------------------------------------------------------------------------------ |
|---|
| 82 | ! -- limtrp & limadv -- ! |
|---|
| 83 | nn_limadv = 0 ! choose the advection scheme (-1=Prather ; 0=Ultimate-Macho) |
|---|
| 84 | nn_limadv_ord = 5 ! choose the order of the advection scheme (if nn_limadv=0) |
|---|
| 85 | ! -- limitd_me -- ! |
|---|
| 86 | nn_icestr = 0 ! ice strength parameteriztaion |
|---|
| 87 | ! 0: Hibler_79 P = pstar*<h>*exp(-c_rhg*A) |
|---|
| 88 | ! 1: Rothrock_75 P = Cf*coeff*integral(wr.h^2) |
|---|
| 89 | rn_pe_rdg = 17.0 ! (nn_icestr=1) ridging work divided by pot. energy change in ridging |
|---|
| 90 | rn_pstar = 2.0e+04 ! (nn_icestr=0) ice strength thickness parameter (N/m2) |
|---|
| 91 | rn_crhg = 20.0 ! (nn_icestr=0) ice strength conc. parameter (-) |
|---|
| 92 | ln_icestr_bvf = .false. ! ice strength function brine volume (T) or not (F) |
|---|
| 93 | ! |
|---|
| 94 | ! -- limdyn & limrhg -- ! |
|---|
| 95 | rn_ishlat = 2. ! free slip (0) ; partial slip (0-2) ; no slip (2) ; strong slip (>2) |
|---|
| 96 | rn_cio = 5.0e-03 ! ice-ocean drag coefficient (-) |
|---|
| 97 | rn_creepl = 1.0e-12 ! creep limit (s-1) |
|---|
| 98 | rn_ecc = 2.0 ! eccentricity of the elliptical yield curve |
|---|
| 99 | nn_nevp = 120 ! number of EVP subcycles |
|---|
| 100 | rn_relast = 0.333 ! ratio of elastic timescale to ice time step: Telast = dt_ice * rn_relast |
|---|
| 101 | ! advised value: 1/3 (rn_nevp=120) or 1/9 (rn_nevp=300) |
|---|
| 102 | ln_landfast = .false. ! landfast ice parameterization (T or F) |
|---|
| 103 | rn_gamma = 0.15 ! (ln_landfast=T) fraction of ocean depth that ice must reach to initiate landfast |
|---|
| 104 | ! recommended range: [0.1 ; 0.25] |
|---|
| 105 | rn_icebfr = 10. ! (ln_landfast=T) maximum bottom stress per unit area of contact (N/m2) |
|---|
| 106 | ! a very large value ensures ice velocity=0 even with a small contact area |
|---|
| 107 | ! recommended range: ?? (should be greater than atm-ice stress => >0.1 N/m2) |
|---|
| 108 | rn_lfrelax = 1.e-5 ! (ln_landfast=T) relaxation time scale to reach static friction (s-1) |
|---|
| 109 | / |
|---|
| 110 | !------------------------------------------------------------------------------ |
|---|
| 111 | &namicethd ! Ice thermodynamics |
|---|
| 112 | !------------------------------------------------------------------------------ |
|---|
| 113 | ! -- limthd_dif -- ! |
|---|
| 114 | rn_kappa_i = 1.0 ! radiation attenuation coefficient in sea ice (m-1) |
|---|
| 115 | nn_ice_thcon = 1 ! sea ice thermal conductivity |
|---|
| 116 | ! 0: k = k0 + beta.S/T (Untersteiner, 1964) |
|---|
| 117 | ! 1: k = k0 + beta1.S/T - beta2.T (Pringle et al., 2007) |
|---|
| 118 | ln_dqnsice = .true. ! change the surface non-solar flux with surface temperature (T) or not (F) |
|---|
| 119 | rn_cdsn = 0.31 ! thermal conductivity of the snow (0.31 W/m/K, Maykut and Untersteiner, 1971) |
|---|
| 120 | ! Obs: 0.1-0.5 (Lecomte et al, JAMES 2013) |
|---|
| 121 | ! -- limthd_dh -- ! |
|---|
| 122 | ln_limdH = .true. ! activate ice thickness change from growing/melting (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO |
|---|
| 123 | rn_betas = 0.66 ! exponent in lead-ice repratition of snow precipitation |
|---|
| 124 | ! betas = 1 -> equipartition, betas < 1 -> more on leads |
|---|
| 125 | ! -- limthd_da -- ! |
|---|
| 126 | ln_limdA = .true. ! activate lateral melting param. (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO |
|---|
| 127 | rn_beta = 1.0 ! (ln_latmelt=T) coef. beta for lateral melting param. Recommended range=[0.8-1.2] |
|---|
| 128 | ! => decrease = more melt and melt peaks toward higher concentration (A~0.5 for beta=1 ; A~0.8 for beta=0.2) |
|---|
| 129 | ! 0.3 = best fit for western Fram Strait and Antarctica |
|---|
| 130 | ! 1.4 = best fit for eastern Fram Strait |
|---|
| 131 | rn_dmin = 8. ! (ln_latmelt=T) minimum floe diameter for lateral melting param. Recommended range=[6-10] |
|---|
| 132 | ! => 6 vs 8m = +40% melting at the peak (A~0.5) |
|---|
| 133 | ! 10 vs 8m = -20% melting |
|---|
| 134 | ! -- limthd_lac -- ! |
|---|
| 135 | ln_limdO = .true. ! activate ice growth in open-water (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO |
|---|
| 136 | rn_hnewice = 0.1 ! thickness for new ice formation in open water (m) |
|---|
| 137 | ln_frazil = .false. ! Frazil ice parameterization (ice collection as a function of wind) |
|---|
| 138 | rn_maxfrazb = 1.0 ! (ln_frazil=T) maximum fraction of frazil ice collecting at the ice base |
|---|
| 139 | rn_vfrazb = 0.417 ! (ln_frazil=T) thresold drift speed for frazil ice collecting at the ice bottom (m/s) |
|---|
| 140 | rn_Cfrazb = 5.0 ! (ln_frazil=T) squeezing coefficient for frazil ice collecting at the ice bottom |
|---|
| 141 | ! -- limitd_th -- ! |
|---|
| 142 | rn_himin = 0.1 ! minimum ice thickness (m) used in remapping, must be smaller than rn_hnewice |
|---|
| 143 | ! -- icestp -- ! |
|---|
| 144 | nn_limflx = -1 ! LIM3 Multi-category heat flux formulation (use -1 if LIM3 is not used) |
|---|
| 145 | ! =-1 Use per-category fluxes, bypass redistributor, forced mode only, not yet implemented coupled |
|---|
| 146 | ! = 0 Average per-category fluxes (forced and coupled mode) |
|---|
| 147 | ! = 1 Average and redistribute per-category fluxes, forced mode only, not yet implemented coupled |
|---|
| 148 | ! = 2 Redistribute a single flux over categories (coupled mode only) |
|---|
| 149 | / |
|---|
| 150 | !------------------------------------------------------------------------------ |
|---|
| 151 | &namicesal ! Ice salinity |
|---|
| 152 | !------------------------------------------------------------------------------ |
|---|
| 153 | ! -- limthd_sal -- ! |
|---|
| 154 | ln_limdS = .true. ! activate gravity drainage and flushing (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO |
|---|
| 155 | nn_icesal = 2 ! ice salinity option |
|---|
| 156 | ! 1: constant ice salinity (S=rn_icesal) |
|---|
| 157 | ! 2: varying salinity parameterization S(z,t) |
|---|
| 158 | ! 3: prescribed salinity profile S(z), Schwarzacher, 1959 |
|---|
| 159 | rn_icesal = 4. ! (nn_icesal=1) ice salinity (g/kg) |
|---|
| 160 | rn_sal_gd = 5. ! restoring ice salinity, gravity drainage (g/kg) |
|---|
| 161 | rn_time_gd = 1.73e+6 ! restoring time scale, gravity drainage (s) |
|---|
| 162 | rn_sal_fl = 2. ! restoring ice salinity, flushing (g/kg) |
|---|
| 163 | rn_time_fl = 8.64e+5 ! restoring time scale, flushing (s) |
|---|
| 164 | rn_simax = 20. ! maximum tolerated ice salinity (g/kg) |
|---|
| 165 | rn_simin = 0.1 ! minimum tolerated ice salinity (g/kg) |
|---|
| 166 | / |
|---|
| 167 | !------------------------------------------------------------------------------ |
|---|
| 168 | &namicemp ! Melt ponds |
|---|
| 169 | !------------------------------------------------------------------------------ |
|---|
| 170 | ! -- limmp -- ! |
|---|
| 171 | ln_pnd = .false. ! active melt ponds |
|---|
| 172 | ln_pnd_rad = .false. ! active melt ponds radiative coupling |
|---|
| 173 | ln_pnd_fw = .false. ! active melt ponds freshwater coupling |
|---|
| 174 | nn_pnd_scheme = 0 ! type of melt pond scheme : =0 prescribed ( Tsu=0 ), =1 empirical, =2 topographic |
|---|
| 175 | rn_apnd = 0.2 ! prescribed pond fraction, at Tsu=0 : (0<rn_apnd<1, nn_pnd_scheme = 0) |
|---|
| 176 | rn_hpnd = 0.05 ! prescribed pond depth, at Tsu=0 : (0<rn_apnd<1, nn_pnd_scheme = 0) |
|---|
| 177 | / |
|---|
| 178 | !------------------------------------------------------------------------------ |
|---|
| 179 | &namiceitdme ! Ice mechanical redistribution (ridging and rafting) |
|---|
| 180 | !------------------------------------------------------------------------------ |
|---|
| 181 | ! -- limitd_me -- ! |
|---|
| 182 | rn_cs = 0.5 ! fraction of shearing energy contributing to ridging |
|---|
| 183 | nn_partfun = 1 ! type of ridging participation function |
|---|
| 184 | ! 0: linear (Thorndike et al, 1975) |
|---|
| 185 | ! 1: exponential (Lipscomb, 2007) |
|---|
| 186 | rn_gstar = 0.15 ! (nn_partfun = 0) fractional area of thin ice being ridged |
|---|
| 187 | rn_astar = 0.03 ! (nn_partfun = 1) exponential measure of ridging ice fraction [set to 0.05 if hstar=100] |
|---|
| 188 | ln_ridging = .true. ! ridging activated (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO |
|---|
| 189 | rn_hstar = 25.0 ! (ln_ridging = T) determines the maximum thickness of ridged ice (m) (Hibler, 1980) |
|---|
| 190 | rn_por_rdg = 0.3 ! (ln_ridging = T) porosity of newly ridged ice (Lepparanta et al., 1995) |
|---|
| 191 | rn_fsnowrdg = 0.5 ! (ln_ridging = T) snow volume fraction that survives in ridging |
|---|
| 192 | rn_fpondrdg = 1.0 ! (ln_ridging = T) pond fraction that survives in ridging (small a priori) |
|---|
| 193 | ln_rafting = .true. ! rafting activated (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO |
|---|
| 194 | rn_hraft = 0.75 ! (ln_rafting = T) threshold thickness for rafting (m) |
|---|
| 195 | rn_craft = 5.0 ! (ln_rafting = T) squeezing coefficient used in the rafting function |
|---|
| 196 | rn_fsnowrft = 0.5 ! (ln_rafting = T) snow volume fraction that survives in rafting |
|---|
| 197 | rn_fpondrft = 1.0 ! (ln_rafting = T) pond fraction that survives in rafting (0.5 a priori) |
|---|
| 198 | / |
|---|
| 199 | !----------------------------------------------------------------------- |
|---|
| 200 | &namicealb ! albedo parameters |
|---|
| 201 | !----------------------------------------------------------------------- |
|---|
| 202 | nn_ice_alb = 1 ! parameterization of ice/snow albedo |
|---|
| 203 | ! 0: Shine & Henderson-Sellers (JGR 1985), giving clear-sky albedo |
|---|
| 204 | ! 1: "home made" based on Brandt et al. (JClim 2005) and Grenfell & Perovich (JGR 2004), |
|---|
| 205 | ! giving cloud-sky albedo |
|---|
| 206 | rn_alb_sdry = 0.85 ! dry snow albedo : 0.80 (nn_ice_alb = 0); 0.85 (nn_ice_alb = 1); obs 0.85-0.87 (cloud-sky) |
|---|
| 207 | rn_alb_smlt = 0.75 ! melting snow albedo : 0.65 ( '' ) ; 0.75 ( '' ) ; obs 0.72-0.82 ( '' ) |
|---|
| 208 | rn_alb_idry = 0.60 ! dry ice albedo : 0.72 ( '' ) ; 0.60 ( '' ) ; obs 0.54-0.65 ( '' ) |
|---|
| 209 | rn_alb_imlt = 0.50 ! bare puddled ice albedo : 0.53 ( '' ) ; 0.50 ( '' ) ; obs 0.49-0.58 ( '' ) |
|---|
| 210 | rn_alb_dpnd = 0.27 ! ponded ice albedo : 0.25 ( '' ) ; 0.27 ( '' ) ; obs 0.10-0.30 ( '' ) |
|---|
| 211 | / |
|---|
