| 1 | !!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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| 2 | !! SI3 Reference 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 boundary conditions (namsbc) |
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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 = 2 ! number of snow layers |
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| 27 | ln_virtual_itd = .false. ! virtual ITD mono-category parameterization (jpl=1 only) |
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| 28 | ! i.e. enhanced thermal conductivity & virtual thin ice melting |
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| 29 | ln_icedyn = .true. ! ice dynamics (T) or not (F) |
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| 30 | ln_icethd = .true. ! ice thermo (T) or not (F) |
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| 31 | rn_amax_n = 0.997 ! maximum tolerated ice concentration NH |
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| 32 | rn_amax_s = 0.997 ! maximum tolerated ice concentration SH |
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| 33 | cn_icerst_in = "restart_ice" ! suffix of ice restart name (input) |
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| 34 | cn_icerst_out = "restart_ice" ! suffix of ice restart name (output) |
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| 35 | cn_icerst_indir = "." ! directory to read input ice restarts |
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| 36 | cn_icerst_outdir = "." ! directory to write output ice restarts |
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| 37 | / |
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| 38 | !------------------------------------------------------------------------------ |
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| 39 | &namitd ! Ice discretization |
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| 40 | !------------------------------------------------------------------------------ |
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| 41 | ln_cat_hfn = .true. ! ice categories are defined by a function following rn_himean**(-0.05) |
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| 42 | rn_himean = 2.0 ! expected domain-average ice thickness (m) |
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| 43 | ln_cat_usr = .false. ! ice categories are defined by rn_catbnd below (m) |
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| 44 | rn_catbnd = 0.,0.45,1.1,2.1,3.7,6.0 |
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| 45 | rn_himin = 0.1 ! minimum ice thickness (m) allowed |
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| 46 | rn_himax = 99.0 ! maximum ice thickness (m) allowed |
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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_dynALL = .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_dynADV1D = .false. ! dyn.: only advection 1D (Schar & Smolarkiewicz 1996 test case) |
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| 54 | ln_dynADV2D = .false. ! dyn.: only advection 2D w prescribed vel.(rn_uvice + advection) |
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| 55 | rn_uice = 0.5 ! prescribed ice u-velocity |
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| 56 | rn_vice = 0.5 ! prescribed ice v-velocity |
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| 57 | rn_ishlat = 2. ! lbc : free slip (0) ; partial slip (0-2) ; no slip (2) ; strong slip (>2) |
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| 58 | ln_landfast_L16 = .false. ! landfast: parameterization from Lemieux 2016 |
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| 59 | rn_lf_depfra = 0.125 ! fraction of ocean depth that ice must reach to initiate landfast |
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| 60 | ! recommended range: [0.1 ; 0.25] |
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| 61 | rn_lf_bfr = 15. ! maximum bottom stress per unit volume [N/m3] |
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| 62 | rn_lf_relax = 1.e-5 ! relaxation time scale to reach static friction [s-1] |
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| 63 | rn_lf_tensile = 0.05 ! isotropic tensile strength [0-0.5??] |
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| 64 | |
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| 65 | cn_dir = './' ! root directory for the grounded icebergs mask data location |
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| 66 | !___________!________________!___________________!___________!_____________!________!___________!__________!__________!_______________! |
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| 67 | ! ! file name ! frequency (hours) ! variable ! time interp.! clim ! 'yearly'/ ! weights ! rotation ! land/sea mask ! |
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| 68 | ! ! ! (if <0 months) ! name ! (logical) ! (T/F) ! 'monthly' ! filename ! pairing ! filename ! |
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| 69 | sn_icbmsk = 'NOT USED' , -12. , 'icb_mask', .false. , .true. , 'yearly' , '' , '' , '' |
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| 70 | / |
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| 71 | !------------------------------------------------------------------------------ |
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| 72 | &namdyn_rdgrft ! Ice ridging/rafting |
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| 73 | !------------------------------------------------------------------------------ |
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| 74 | ! -- ice_rdgrft_strength -- ! |
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| 75 | ln_str_H79 = .true. ! ice strength param.: Hibler_79 => P = pstar*<h>*exp(-c_rhg*A) |
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| 76 | rn_pstar = 2.0e+04 ! ice strength thickness parameter [N/m2] |
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| 77 | rn_crhg = 20.0 ! ice strength conc. parameter (-) |
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| 78 | ! -- ice_rdgrft -- ! |
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| 79 | rn_csrdg = 0.5 ! fraction of shearing energy contributing to ridging |
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| 80 | ! -- ice_rdgrft_prep -- ! |
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| 81 | ln_partf_lin = .false. ! Linear ridging participation function (Thorndike et al, 1975) |
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| 82 | rn_gstar = 0.15 ! fractional area of thin ice being ridged |
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| 83 | ln_partf_exp = .true. ! Exponential ridging participation function (Lipscomb, 2007) |
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| 84 | rn_astar = 0.03 ! exponential measure of ridging ice fraction [set to 0.05 if hstar=100] |
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| 85 | ln_ridging = .true. ! ridging activated (T) or not (F) |
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| 86 | rn_hstar = 25.0 ! determines the maximum thickness of ridged ice [m] (Hibler, 1980) |
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| 87 | rn_porordg = 0.3 ! porosity of newly ridged ice (Lepparanta et al., 1995) |
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| 88 | rn_fsnwrdg = 0.5 ! snow volume fraction that survives in ridging |
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| 89 | rn_fpndrdg = 1.0 ! pond fraction that survives in ridging (small a priori) |
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| 90 | ln_rafting = .true. ! rafting activated (T) or not (F) |
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| 91 | rn_hraft = 0.75 ! threshold thickness for rafting [m] |
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| 92 | rn_craft = 5.0 ! squeezing coefficient used in the rafting function |
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| 93 | rn_fsnwrft = 0.5 ! snow volume fraction that survives in rafting |
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| 94 | rn_fpndrft = 1.0 ! pond fraction that survives in rafting (0.5 a priori) |
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| 95 | / |
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| 96 | !------------------------------------------------------------------------------ |
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| 97 | &namdyn_rhg ! Ice rheology |
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| 98 | !------------------------------------------------------------------------------ |
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| 99 | ln_rhg_EVP = .true. ! EVP rheology |
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| 100 | ln_aEVP = .true. ! adaptive rheology (Kimmritz et al. 2016 & 2017) |
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| 101 | rn_creepl = 2.0e-9 ! creep limit [1/s] |
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| 102 | rn_ecc = 2.0 ! eccentricity of the elliptical yield curve |
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| 103 | nn_nevp = 100 ! number of EVP subcycles |
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| 104 | rn_relast = 0.333 ! ratio of elastic timescale to ice time step: Telast = dt_ice * rn_relast |
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| 105 | ! advised value: 1/3 (nn_nevp=100) or 1/9 (nn_nevp=300) |
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| 106 | nn_rhg_chkcvg = 0 ! check convergence of rheology |
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| 107 | ! = 0 no check |
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| 108 | ! = 1 check at the main time step (output xml: uice_cvg) |
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| 109 | ! = 2 check at both main and rheology time steps (additional output: ice_cvg.nc) |
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| 110 | ! this option 2 asks a lot of communications between cpu |
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| 111 | / |
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| 112 | !------------------------------------------------------------------------------ |
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| 113 | &namdyn_adv ! Ice advection |
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| 114 | !------------------------------------------------------------------------------ |
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| 115 | ln_adv_Pra = .true. ! Advection scheme (Prather) |
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| 116 | ln_adv_UMx = .false. ! Advection scheme (Ultimate-Macho) |
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| 117 | nn_UMx = 5 ! order of the scheme for UMx (1-5 ; 20=centered 2nd order) |
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| 118 | / |
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| 119 | !------------------------------------------------------------------------------ |
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| 120 | &namsbc ! Ice surface boundary conditions |
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| 121 | !------------------------------------------------------------------------------ |
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| 122 | rn_cio = 5.0e-03 ! ice-ocean drag coefficient (-) |
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| 123 | nn_snwfra = 2 ! calculate the fraction of ice covered by snow (for zdf and albedo) |
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| 124 | ! = 0 fraction = 1 (if snow) or 0 (if no snow) |
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| 125 | ! = 1 fraction = 1-exp(-0.2*rhos*hsnw) [MetO formulation] |
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| 126 | ! = 2 fraction = hsnw / (hsnw+0.02) [CICE formulation] |
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| 127 | rn_snwblow = 0.66 ! mesure of snow blowing into the leads |
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| 128 | ! = 1 => no snow blowing, < 1 => some snow blowing |
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| 129 | nn_flxdist = -1 ! Redistribute heat flux over ice categories |
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| 130 | ! =-1 Do nothing (needs N(cat) fluxes) |
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| 131 | ! = 0 Average N(cat) fluxes then apply the average over the N(cat) ice |
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| 132 | ! = 1 Average N(cat) fluxes then redistribute over the N(cat) ice using T-ice and albedo sensitivity |
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| 133 | ! = 2 Redistribute a single flux over categories |
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| 134 | ln_cndflx = .false. ! Use conduction flux as surface boundary conditions (i.e. for Jules coupling) |
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| 135 | ln_cndemulate = .false. ! emulate conduction flux (if not provided in the inputs) |
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| 136 | nn_qtrice = 1 ! Solar flux transmitted thru the surface scattering layer: |
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| 137 | ! = 0 Grenfell and Maykut 1977 (depends on cloudiness and is 0 when there is snow) |
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| 138 | ! = 1 Lebrun 2019 (equals 0.3 anytime with different melting/dry snw conductivities) |
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| 139 | / |
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| 140 | !------------------------------------------------------------------------------ |
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| 141 | &namthd ! Ice thermodynamics |
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| 142 | !------------------------------------------------------------------------------ |
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| 143 | ln_icedH = .true. ! activate ice thickness change from growing/melting (T) or not (F) |
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| 144 | ln_icedA = .true. ! activate lateral melting param. (T) or not (F) |
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| 145 | ln_icedO = .true. ! activate ice growth in open-water (T) or not (F) |
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| 146 | ln_icedS = .true. ! activate brine drainage (T) or not (F) |
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| 147 | ! |
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| 148 | ln_leadhfx = .true. ! heat in the leads is used to melt sea-ice before warming the ocean |
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| 149 | / |
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| 150 | !------------------------------------------------------------------------------ |
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| 151 | &namthd_zdf ! Ice heat diffusion |
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| 152 | !------------------------------------------------------------------------------ |
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| 153 | ln_zdf_BL99 = .true. ! Heat diffusion follows Bitz and Lipscomb 1999 |
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| 154 | ln_cndi_U64 = .false. ! sea ice thermal conductivity: k = k0 + beta.S/T (Untersteiner, 1964) |
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| 155 | ln_cndi_P07 = .true. ! sea ice thermal conductivity: k = k0 + beta1.S/T - beta2.T (Pringle et al., 2007) |
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| 156 | rn_cnd_s = 0.31 ! thermal conductivity of the snow (0.31 W/m/K, Maykut and Untersteiner, 1971) |
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| 157 | ! Obs: 0.1-0.5 (Lecomte et al, JAMES 2013) |
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| 158 | rn_kappa_i = 1.0 ! radiation attenuation coefficient in sea ice [1/m] |
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| 159 | rn_kappa_s = 10.0 ! nn_qtrice = 0: radiation attenuation coefficient in snow [1/m] |
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| 160 | rn_kappa_smlt = 7.0 ! nn_qtrice = 1: radiation attenuation coefficient in melting snow [1/m] |
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| 161 | rn_kappa_sdry = 10.0 ! radiation attenuation coefficient in dry snow [1/m] |
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| 162 | ln_zdf_chkcvg = .false. ! check convergence of heat diffusion scheme (outputs: tice_cvgerr, tice_cvgstp) |
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| 163 | / |
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| 164 | !------------------------------------------------------------------------------ |
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| 165 | &namthd_da ! Ice lateral melting |
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| 166 | !------------------------------------------------------------------------------ |
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| 167 | rn_beta = 1.0 ! coef. beta for lateral melting param. Recommended range=[0.8-1.2] |
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| 168 | ! => 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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| 169 | ! 0.3 = best fit for western Fram Strait and Antarctica |
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| 170 | ! 1.4 = best fit for eastern Fram Strait |
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| 171 | rn_dmin = 8. ! minimum floe diameter for lateral melting param. Recommended range=[6-10] |
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| 172 | ! => 6 vs 8m = +40% melting at the peak (A~0.5) |
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| 173 | ! 10 vs 8m = -20% melting |
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| 174 | / |
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| 175 | !------------------------------------------------------------------------------ |
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| 176 | &namthd_do ! Ice growth in open water |
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| 177 | !------------------------------------------------------------------------------ |
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| 178 | rn_hinew = 0.1 ! thickness for new ice formation in open water (m), must be larger than rn_himin |
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| 179 | ln_frazil = .false. ! Frazil ice parameterization (ice collection as a function of wind) |
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| 180 | rn_maxfraz = 1.0 ! maximum fraction of frazil ice collecting at the ice base |
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| 181 | rn_vfraz = 0.417 ! thresold drift speed for frazil ice collecting at the ice bottom (m/s) |
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| 182 | rn_Cfraz = 5.0 ! squeezing coefficient for frazil ice collecting at the ice bottom |
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| 183 | / |
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| 184 | !------------------------------------------------------------------------------ |
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| 185 | &namthd_sal ! Ice salinity |
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| 186 | !------------------------------------------------------------------------------ |
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| 187 | nn_icesal = 2 ! ice salinity option |
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| 188 | ! 1: constant ice salinity (S=rn_icesal) |
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| 189 | ! 2: varying salinity parameterization S(z,t) |
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| 190 | ! 3: prescribed salinity profile S(z) (Schwarzacher 1959) |
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| 191 | rn_icesal = 4. ! (nn_icesal=1) ice salinity (g/kg) |
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| 192 | rn_sal_gd = 5. ! (nn_icesal=2) restoring ice salinity, gravity drainage (g/kg) |
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| 193 | rn_time_gd = 1.73e+6 ! (nn_icesal=2) restoring time scale, gravity drainage (s) |
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| 194 | rn_sal_fl = 2. ! (nn_icesal=2) restoring ice salinity, flushing (g/kg) |
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| 195 | rn_time_fl = 8.64e+5 ! (nn_icesal=2) restoring time scale, flushing (s) |
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| 196 | rn_simax = 20. ! maximum tolerated ice salinity (g/kg) |
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| 197 | rn_simin = 0.1 ! minimum tolerated ice salinity (g/kg) |
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| 198 | / |
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| 199 | !------------------------------------------------------------------------------ |
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| 200 | &namthd_pnd ! Melt ponds |
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| 201 | !------------------------------------------------------------------------------ |
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| 202 | ln_pnd = .true. ! activate melt ponds or not |
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| 203 | ln_pnd_TOPO = .false. ! topographic melt ponds |
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| 204 | ln_pnd_LEV = .true. ! level ice melt ponds |
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| 205 | rn_apnd_min = 0.15 ! minimum meltwater fraction contributing to pond growth (TOPO and LEV) |
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| 206 | rn_apnd_max = 0.85 ! maximum meltwater fraction contributing to pond growth (TOPO and LEV) |
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| 207 | rn_pnd_flush= 0.01 ! pond flushing efficiency (tuning parameter) (LEV) |
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| 208 | ln_pnd_CST = .false. ! constant melt ponds |
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| 209 | rn_apnd = 0.2 ! prescribed pond fraction, at Tsu=0 degC |
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| 210 | rn_hpnd = 0.05 ! prescribed pond depth, at Tsu=0 degC |
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| 211 | ln_pnd_lids = .true. ! frozen lids on top of the ponds (only for ln_pnd_LEV) |
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| 212 | ln_pnd_alb = .true. ! effect of melt ponds on ice albedo |
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| 213 | / |
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| 214 | !------------------------------------------------------------------------------ |
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| 215 | &namini ! Ice initialization |
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| 216 | !------------------------------------------------------------------------------ |
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| 217 | ln_iceini = .true. ! activate ice initialization (T) or not (F) |
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| 218 | nn_iceini_file = 0 ! 0 = Initialise sea ice based on SSTs |
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| 219 | ! 1 = Initialise sea ice from single category netcdf file |
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| 220 | ! 2 = Initialise sea ice from multi category restart file |
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| 221 | rn_thres_sst = 2.0 ! max temp. above Tfreeze with initial ice = (sst - tfreeze) |
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| 222 | rn_hti_ini_n = 3.0 ! initial ice thickness (m), North |
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| 223 | rn_hti_ini_s = 1.0 ! " " South |
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| 224 | rn_hts_ini_n = 0.3 ! initial snow thickness (m), North |
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| 225 | rn_hts_ini_s = 0.3 ! " " South |
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| 226 | rn_ati_ini_n = 0.9 ! initial ice concentration (-), North |
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| 227 | rn_ati_ini_s = 0.9 ! " " South |
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| 228 | rn_smi_ini_n = 6.3 ! initial ice salinity (g/kg), North |
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| 229 | rn_smi_ini_s = 6.3 ! " " South |
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| 230 | rn_tmi_ini_n = 270. ! initial ice temperature (K), North |
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| 231 | rn_tmi_ini_s = 270. ! " " South |
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| 232 | rn_tsu_ini_n = 270. ! initial surface temperature (K), North |
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| 233 | rn_tsu_ini_s = 270. ! " " South |
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| 234 | rn_tms_ini_n = 270. ! initial snw temperature (K), North |
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| 235 | rn_tms_ini_s = 270. ! " " South |
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| 236 | rn_apd_ini_n = 0.2 ! initial pond fraction (-), North |
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| 237 | rn_apd_ini_s = 0.2 ! " " South |
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| 238 | rn_hpd_ini_n = 0.05 ! initial pond depth (m), North |
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| 239 | rn_hpd_ini_s = 0.05 ! " " South |
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| 240 | rn_hld_ini_n = 0.0 ! initial pond lid depth (m), North |
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| 241 | rn_hld_ini_s = 0.0 ! " " South |
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| 242 | ! -- for nn_iceini_file = 1 |
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| 243 | sn_hti = 'Ice_initialization' , -12. ,'hti' , .false. , .true., 'yearly' , '' , '', '' |
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| 244 | sn_hts = 'Ice_initialization' , -12. ,'hts' , .false. , .true., 'yearly' , '' , '', '' |
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| 245 | sn_ati = 'Ice_initialization' , -12. ,'ati' , .false. , .true., 'yearly' , '' , '', '' |
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| 246 | sn_smi = 'Ice_initialization' , -12. ,'smi' , .false. , .true., 'yearly' , '' , '', '' |
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| 247 | sn_tmi = 'Ice_initialization' , -12. ,'tmi' , .false. , .true., 'yearly' , '' , '', '' |
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| 248 | sn_tsu = 'Ice_initialization' , -12. ,'tsu' , .false. , .true., 'yearly' , '' , '', '' |
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| 249 | sn_tms = 'NOT USED' , -12. ,'tms' , .false. , .true., 'yearly' , '' , '', '' |
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| 250 | ! melt ponds (be careful, sn_apd is the pond concentration (not fraction), so it differs from rn_apd) |
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| 251 | sn_apd = 'NOT USED' , -12. ,'apd' , .false. , .true., 'yearly' , '' , '', '' |
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| 252 | sn_hpd = 'NOT USED' , -12. ,'hpd' , .false. , .true., 'yearly' , '' , '', '' |
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| 253 | sn_hld = 'NOT USED' , -12. ,'hld' , .false. , .true., 'yearly' , '' , '', '' |
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| 254 | cn_dir='./' |
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| 255 | / |
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| 256 | !------------------------------------------------------------------------------ |
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| 257 | &namalb ! albedo parameters |
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| 258 | !------------------------------------------------------------------------------ |
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| 259 | ! ! ! obs range (cloud-sky) |
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| 260 | rn_alb_sdry = 0.85 ! dry snow albedo : 0.85 -- 0.87 |
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| 261 | rn_alb_smlt = 0.75 ! melting snow albedo : 0.72 -- 0.82 |
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| 262 | rn_alb_idry = 0.60 ! dry ice albedo : 0.54 -- 0.65 |
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| 263 | rn_alb_imlt = 0.50 ! bare puddled ice albedo : 0.49 -- 0.58 |
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| 264 | rn_alb_dpnd = 0.27 ! ponded ice albedo : 0.10 -- 0.30 |
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| 265 | / |
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| 266 | !------------------------------------------------------------------------------ |
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| 267 | &namdia ! Diagnostics |
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| 268 | !------------------------------------------------------------------------------ |
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| 269 | ln_icediachk = .false. ! check online heat, mass & salt budgets |
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| 270 | ! ! rate of ice spuriously gained/lost at each time step => rn_icechk=1 <=> 1.e-6 m/hour |
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| 271 | rn_icechk_cel = 1. ! check at each gridcell (1.e-06m/h)=> stops the code if violated (and writes a file) |
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| 272 | rn_icechk_glo = 1.e-04 ! check over the entire ice cover (1.e-10m/h)=> only prints warnings |
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| 273 | ln_icediahsb = .false. ! output the heat, mass & salt budgets (T) or not (F) |
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| 274 | ln_icectl = .false. ! ice points output for debug (T or F) |
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| 275 | iiceprt = 10 ! i-index for debug |
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| 276 | jiceprt = 10 ! j-index for debug |
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| 277 | / |
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