!!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> !! LIM3 namelist: !! 1 - Generic parameters (namicerun) !! 2 - Diagnostics (namicediag) !! 3 - Ice initialization (namiceini) !! 4 - Ice discretization (namiceitd) !! 5 - Ice dynamics and transport (namicedyn) !! 6 - Ice diffusion (namicehdf) !! 7 - Ice thermodynamics (namicethd) !! 8 - Ice salinity (namicesal) !! 9 - Ice mechanical redistribution (namiceitdme) !!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ! !------------------------------------------------------------------------------ &namicerun ! Generic parameters !------------------------------------------------------------------------------ jpl = 5 ! number of ice categories nlay_i = 2 ! number of ice layers nlay_s = 1 ! number of snow layers (only 1 is working) rn_amax_n = 0.997 ! maximum tolerated ice concentration NH rn_amax_s = 0.997 ! maximum tolerated ice concentration SH cn_icerst_in = "restart_ice" ! suffix of ice restart name (input) cn_icerst_out = "restart_ice" ! suffix of ice restart name (output) cn_icerst_indir = "." ! directory to read input ice restarts cn_icerst_outdir = "." ! directory to write output ice restarts ln_limthd = .true. ! ice thermo (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO ln_limdyn = .true. ! ice dynamics (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO nn_limdyn = 2 ! (ln_limdyn=T) switch for ice dynamics ! 2: total ! 1: advection only (no diffusion, no ridging/rafting) ! 0: advection only (as 1 but with prescribed velocity, bypass rheology) rn_uice = 0.00001 ! (nn_limdyn=0) ice u-velocity rn_vice = -0.00001 ! (nn_limdyn=0) ice v-velocity / !------------------------------------------------------------------------------ &namicediag ! Diagnostics !------------------------------------------------------------------------------ ln_limdiachk = .false. ! check online the heat, mass & salt budgets (T) or not (F) ln_limdiahsb = .false. ! output the heat, mass & salt budgets (T) or not (F) ln_limctl = .false. ! ice points output for debug (T or F) iiceprt = 10 ! i-index for debug jiceprt = 10 ! j-index for debug / !------------------------------------------------------------------------------ &namiceini ! Ice initialization !------------------------------------------------------------------------------ ! -- limistate -- ! ln_limini = .false. ! activate ice initialization (T) or not (F) ln_limini_file = .false. ! netcdf file provided for initialization (T) or not (F) rn_thres_sst = 0.5 ! maximum water temperature with initial ice (degC) rn_hts_ini_n = 0.3 ! initial real snow thickness (m), North rn_hts_ini_s = 0.3 ! " " South rn_hti_ini_n = 3.0 ! initial real ice thickness (m), North rn_hti_ini_s = 1.0 ! " " South rn_ati_ini_n = 0.9 ! initial ice concentration (-), North rn_ati_ini_s = 0.9 ! " " South rn_smi_ini_n = 6.3 ! initial ice salinity (g/kg), North rn_smi_ini_s = 6.3 ! " " South rn_tmi_ini_n = 270. ! initial ice/snw temperature (K), North rn_tmi_ini_s = 270. ! " " South / !------------------------------------------------------------------------------ &namiceitd ! Ice discretization !------------------------------------------------------------------------------ nn_catbnd = 2 ! computation of ice category boundaries based on ! 1: tanh function ! 2: h^(-alpha), function of rn_himean rn_himean = 2.0 ! (nn_catbnd=2) expected domain-average ice thickness (m) / !------------------------------------------------------------------------------ &namicedyn ! Ice dynamics and transport !------------------------------------------------------------------------------ ! -- limtrp & limadv -- ! nn_limadv = 0 ! choose the advection scheme (-1=Prather ; 0=Ultimate-Macho) nn_limadv_ord = 5 ! choose the order of the advection scheme (if nn_limadv=0) ! -- limitd_me -- ! nn_icestr = 0 ! ice strength parameteriztaion ! 0: Hibler_79 P = pstar**exp(-c_rhg*A) ! 1: Rothrock_75 P = Cf*coeff*integral(wr.h^2) rn_pe_rdg = 17.0 ! (nn_icestr=1) ridging work divided by pot. energy change in ridging rn_pstar = 2.0e+04 ! (nn_icestr=0) ice strength thickness parameter (N/m2) rn_crhg = 20.0 ! (nn_icestr=0) ice strength conc. parameter (-) ln_icestr_bvf = .false. ! ice strength function brine volume (T) or not (F) ! ! -- limdyn & limrhg -- ! rn_cio = 5.0e-03 ! ice-ocean drag coefficient (-) rn_creepl = 1.0e-12 ! creep limit (s-1) rn_ecc = 2.0 ! eccentricity of the elliptical yield curve nn_nevp = 120 ! number of EVP subcycles rn_relast = 0.333 ! ratio of elastic timescale to ice time step: Telast = dt_ice * rn_relast ! advised value: 1/3 (rn_nevp=120) or 1/9 (rn_nevp=300) ln_landfast = .false. ! landfast ice parameterization (T or F) rn_gamma = 0.15 ! (ln_landfast=T) fraction of ocean depth that ice must reach to initiate landfast ! recommended range: [0.1 ; 0.25] rn_icebfr = 10. ! (ln_landfast=T) maximum bottom stress per unit area of contact (N/m2) ! a very large value ensures ice velocity=0 even with a small contact area ! recommended range: ?? (should be greater than atm-ice stress => >0.1 N/m2) rn_lfrelax = 1.e-5 ! (ln_landfast=T) relaxation time scale to reach static friction (s-1) / !------------------------------------------------------------------------------ &namicehdf ! Ice horizontal diffusion !------------------------------------------------------------------------------ ! -- limhdf -- ! nn_ahi0 = -1 ! horizontal diffusivity computation ! -1: no diffusion (bypass limhdf) ! 0: use rn_ahi0_ref ! 1: use rn_ahi0_ref x mean grid cell length / ( 2deg mean grid cell length ) ! 2: use rn_ahi0_ref x grid cell length / ( 2deg mean grid cell length ) rn_ahi0_ref = 350.0 ! horizontal sea ice diffusivity (m2/s) ! if nn_ahi0 > 0, rn_ahi0_ref is the reference value at a nominal 2 deg resolution / !------------------------------------------------------------------------------ &namicethd ! Ice thermodynamics !------------------------------------------------------------------------------ ! -- limthd_dif -- ! rn_kappa_i = 1.0 ! radiation attenuation coefficient in sea ice (m-1) nn_conv_dif = 50 ! maximal number of iterations for heat diffusion computation rn_terr_dif = 1.0e-04 ! maximum temperature after heat diffusion (degC) nn_ice_thcon = 1 ! sea ice thermal conductivity ! 0: k = k0 + beta.S/T (Untersteiner, 1964) ! 1: k = k0 + beta1.S/T - beta2.T (Pringle et al., 2007) ln_it_qnsice = .true. ! iterate the surface non-solar flux with surface temperature (T) or not (F) nn_monocat = 0 ! virtual ITD mono-category parameterizations (1, jpl = 1 only) or not (0) ! 2: simple piling instead of ridging --- temporary option ! 3: activate G(he) only --- temporary option ! 4: activate extra lateral melting only --- temporary option ! -- limthd_dh -- ! ln_limdH = .true. ! activate ice thickness change from growing/melting (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO rn_betas = 0.66 ! exponent in lead-ice repratition of snow precipitation ! betas = 1 -> equipartition, betas < 1 -> more on leads ! -- limthd_da -- ! ln_limdA = .true. ! activate lateral melting param. (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO rn_beta = 1.0 ! (ln_latmelt=T) coef. beta for lateral melting param. Recommended range=[0.8-1.2] ! => decrease = more melt and melt peaks toward higher concentration (A~0.5 for beta=1 ; A~0.8 for beta=0.2) ! 0.3 = best fit for western Fram Strait and Antarctica ! 1.4 = best fit for eastern Fram Strait rn_dmin = 8. ! (ln_latmelt=T) minimum floe diameter for lateral melting param. Recommended range=[6-10] ! => 6 vs 8m = +40% melting at the peak (A~0.5) ! 10 vs 8m = -20% melting ! -- limthd_lac -- ! ln_limdO = .true. ! activate ice growth in open-water (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO rn_hnewice = 0.1 ! thickness for new ice formation in open water (m) ln_frazil = .false. ! Frazil ice parameterization (ice collection as a function of wind) rn_maxfrazb = 1.0 ! (ln_frazil=T) maximum fraction of frazil ice collecting at the ice base rn_vfrazb = 0.417 ! (ln_frazil=T) thresold drift speed for frazil ice collecting at the ice bottom (m/s) rn_Cfrazb = 5.0 ! (ln_frazil=T) squeezing coefficient for frazil ice collecting at the ice bottom ! -- limitd_th -- ! rn_himin = 0.1 ! minimum ice thickness (m) used in remapping, must be smaller than rn_hnewice / !------------------------------------------------------------------------------ &namicesal ! Ice salinity !------------------------------------------------------------------------------ ! -- limthd_sal -- ! ln_limdS = .true. ! activate gravity drainage and flushing (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO nn_icesal = 2 ! ice salinity option ! 1: constant ice salinity (S=rn_icesal) ! 2: varying salinity parameterization S(z,t) ! 3: prescribed salinity profile S(z), Schwarzacher, 1959 rn_icesal = 4. ! (nn_icesal=1) ice salinity (g/kg) rn_sal_gd = 5. ! restoring ice salinity, gravity drainage (g/kg) rn_time_gd = 1.73e+6 ! restoring time scale, gravity drainage (s) rn_sal_fl = 2. ! restoring ice salinity, flushing (g/kg) rn_time_fl = 8.64e+5 ! restoring time scale, flushing (s) rn_simax = 20. ! maximum tolerated ice salinity (g/kg) rn_simin = 0.1 ! minimum tolerated ice salinity (g/kg) / !------------------------------------------------------------------------------ &namiceitdme ! Ice mechanical redistribution (ridging and rafting) !------------------------------------------------------------------------------ ! -- limitd_me -- ! rn_cs = 0.5 ! fraction of shearing energy contributing to ridging nn_partfun = 1 ! type of ridging participation function ! 0: linear (Thorndike et al, 1975) ! 1: exponential (Lipscomb, 2007) rn_gstar = 0.15 ! (nn_partfun = 0) fractional area of thin ice being ridged rn_astar = 0.05 ! (nn_partfun = 1) exponential measure of ridging ice fraction ln_ridging = .true. ! ridging activated (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO rn_hstar = 100.0 ! (ln_ridging = T) determines the maximum thickness of ridged ice (m) (Hibler, 1980) rn_por_rdg = 0.3 ! (ln_ridging = T) porosity of newly ridged ice (Lepparanta et al., 1995) rn_fsnowrdg = 0.5 ! (ln_ridging = T) snow volume fraction that survives in ridging ln_rafting = .true. ! rafting activated (T) or not (F) => DO NOT TOUCH UNLESS U KNOW WHAT U DO rn_hraft = 0.75 ! (ln_rafting = T) threshold thickness for rafting (m) rn_craft = 5.0 ! (ln_rafting = T) squeezing coefficient used in the rafting function rn_fsnowrft = 0.5 ! (ln_rafting = T) snow volume fraction that survives in rafting /