:tocdepth: 3 .. _case_settings: Case Settings ===================== There are two important files that define the case, **cice.settings** and **ice_in**. **cice.settings** is a list of env variables that define many values used to setup, build and run the case. **ice_in** is the input namelist file for CICE. Variables in both files are described below. .. _tabsettings: Table of CICE Settings -------------------------- The **cice.settings** file is reasonably well self documented. Several of the variables defined in the file are not used in CICE. They exist to support the CICE model. .. csv-table:: *CICE settings* :header: "variable", "options/format", "description", "recommended value" :widths: 15, 15, 25, 20 "ICE_CASENAME", "string", "case name", "set by cice.setup" "ICE_SANDBOX", "string", "sandbox directory", "set by cice.setup" "ICE_MACHINE", "string", "machine name", "set by cice.setup" "ICE_COMPILER", "string", "environment name", "set by cice.setup" "ICE_MACHCOMP", "string", "machine_environment name", "set by cice.setup" "ICE_SCRIPTS", "string", "scripts directory", "set by cice.setup" "ICE_CASEDIR", "string", "case directory", "set by cice.setup" "ICE_RUNDIR", "string", "run directory", "set by cice.setup" "ICE_OBJDIR", "string", "compile directory", "${ICE_RUNDIR}/compile" "ICE_RSTDIR", "string", "unused", "${ICE_RUNDIR}/restart" "ICE_HSTDIR", "string", "unused", "${ICE_RUNDIR}/history" "ICE_LOGDIR", "string", "log directory", "${ICE_CASEDIR}/logs" "ICE_DRVOPT", "string", "unused", "cice" "ICE_IOTYPE", "string", "I/O format", "set by cice.setup" " ", "netcdf", "serial netCDF" " ", "pio", "parallel netCDF" " ", "none", "netCDF library is not available" "ICE_CLEANBUILD", "true, false", "automatically clean before building", "true" "ICE_QUIETMODE", "true, false", "reduce build output to the screen", "false" "ICE_GRID", "string (see below)", "grid", "set by cice.setup" " ", "gx3", "3-deg displace-pole (Greenland) global grid", " " " ", "gx1", "1-deg displace-pole (Greenland) global grid", " " " ", "tx1", "1-deg tripole global grid", " " " ", "gbox80", "80x80 box", " " " ", "gbox128", "128x128 box", " " "ICE_NTASKS", "integer", "number of tasks, must be set to 1", "set by cice.setup" "ICE_NTHRDS", "integer", "number of threads per task, must be set to 1", "set by cice.setup" "ICE_TEST", "string", "test setting if using a test", "set by cice.setup" "ICE_TESTNAME", "string", "test name if using a test", "set by cice.setup" "ICE_BASELINE", "string", "baseline directory name, associated with cice.setup -bdir ", "set by cice.setup" "ICE_BASEGEN", "string", "baseline directory name for regression generation, associated with cice.setup -bgen ", "set by cice.setup" "ICE_BASECOM", "string", "baseline directory name for regression comparison, associated with cice.setup -bcmp ", "set by cice.setup" "ICE_BFBCOMP", "string", "location of case for comparison, associated with cice.setup -td", "set by cice.setup" "ICE_SPVAL", "string", "special value for cice.settings strings", "set by cice.setup" "ICE_RUNLENGTH", "integer (see below)", "batch run length default", "set by cice.setup" " ", "0", "15 minutes (default)", " " " ", "1", "59 minutes", " " " ", "2", "2 hours", " " " ", "other :math:`2 < N < 8`", "N hours", " " " ", "8 or larger", "8 hours", " " "ICE_ACCOUNT", "string", "batch account number", "set by cice.setup, .cice_proj or by default" "ICE_QUEUE", "string", "batch queue name", "set by cice.setup or by default" "ICE_THREADED", "true, false", "force threading in compile, will always compile threaded if ICE_NTHRDS :math:`> 1`", "false" "ICE_BLDDEBUG", "true, false", "turn on compile debug flags", "false" .. _tabnamelist: Table of namelist options ------------------------------- .. csv-table:: *Namelist options* :header: "also in Icepack","variable", "options/format", "description", "recommended value" :widths: 5, 15, 15, 30, 15 "","", "", "", "" "","*setup_nml*", "", "", "" "","", "", "**Time, Diagnostics**", "" "\*","``days_per_year``", "``360`` or ``365``", "number of days in a model year", "365" "\*","``use_leap_years``", "true/false", "if true, include leap days", "" "\*","``year_init``", "yyyy", "the initial year, if not using restart", "" "\*","``istep0``", "integer", "initial time step number", "0" "\*","``dt``", "seconds", "thermodynamics time step length", "3600." "\*","``npt``", "integer", "total number of time steps to take", "" "\*","``ndtd``", "integer", "number of dynamics/advection/ridging/steps per thermo timestep", "1" "","", "", "**Initialization/Restarting**", "" "","``runtype``", "``initial``", "start from ``ice_ic``", "" "","", "``continue``", "restart using ``pointer_file``", "" "\*","``ice_ic``", "``default``", "latitude and sst dependent", "default" "","", "``none``", "no ice", "" "","", "path/file", "restart file name", "" "","``restart``", "true/false", "initialize using restart file", "``.true.``" "","``use_restart_time``", "true/false", "set initial date using restart file", "``.true.``" "","``restart_format``", "nc", "read/write  restart files (use with PIO)", "" "","", "bin", "read/write binary restart files", "" "","``lcdf64``", "true/false", "if true, use 64-bit  format", "" "","``numin``", "integer", "minimum internal IO unit number", "11" "","``numax``", "integer", "maximum internal IO unit number", "99" "\*","``restart_dir``", "path/", "path to restart directory", "" "","``restart_ext``", "true/false", "read/write halo cells in restart files", "" "","``restart_file``", "filename prefix", "output file for restart dump", "‘iced’" "","``pointer_file``", "pointer filename", "contains restart filename", "" "\*","``dumpfreq``", "``y``", "write restart every ``dumpfreq_n`` years", "y" "","", "``m``", "write restart every ``dumpfreq_n`` months", "" "","", "``d``", "write restart every ``dumpfreq_n`` days", "" "","", "``h``", "write restart every ``dumpfreq_n`` hours", "" "","", "``1``", "write restart every ``dumpfreq_n`` time step", "" "","``dumpfreq_n``", "integer", "frequency restart data is written", "1" "\*","``dump_last``", "true/false", "if true, write restart on last time step of simulation", "" "","", "", "**Model Output**", "" "","``bfbflag``", "off/lsum4/lsum8/lsum16/ddpdd/reprosum", "global sum methods", "off" "\*","``diagfreq``", "integer", "frequency of diagnostic output in ``dt``", "24" "","", "*e.g.*, 10", "once every 10 time steps", "" "\*","``diag_type``", "``stdout``", "write diagnostic output to stdout", "" "","", "``file``", "write diagnostic output to file", "" "","``diag_file``", "filename", "diagnostic output file (script may reset)", "" "","``print_global``", "true/false", "print diagnostic data, global sums", "``.false.``" "","``print_points``", "true/false", "print diagnostic data for two grid points", "``.false.``" "","``latpnt``", "real", "latitude of (2) diagnostic points", "" "","``lonpnt``", "real", "longitude of (2) diagnostic points", "" "","``dbug``", "true/false", "if true, write extra diagnostics", "``.false.``" "","``histfreq``", "string array", "defines output frequencies", "" "","", "``y``", "write history every ``histfreq_n`` years", "" "","", "``m``", "write history every ``histfreq_n`` months", "" "","", "``d``", "write history every ``histfreq_n`` days", "" "","", "``h``", "write history every ``histfreq_n`` hours", "" "","", "``1``", "write history every ``histfreq_n`` time step", "" "","", "``x``", "unused frequency stream (not written)", "" "","``histfreq_n``", "integer array", "frequency history output is written", "" "","", "0", "do not write to history", "" "","``hist_avg``", "true", "write time-averaged data", "``.true.``" "","", "false", "write snapshots of data", "" "","``history_dir``", "path/", "path to history output directory", "" "","``history_file``", "filename prefix", "output file for history", "‘iceh’" "","``write_ic``", "true/false", "write initial condition", "" "","``incond_dir``", "path/", "path to initial condition directory", "" "","``incond_file``", "filename prefix", "output file for initial condition", "‘iceh’" "","``runid``", "string", "label for run (currently CESM only)", "" "","", "", "", "" "","*grid_nml*", "", "", "" "","", "", "**Grid**", "" "","``grid_format``", "``nc``", "read  grid and kmt files", "‘bin’" "","", "``bin``", "read direct access, binary file", "" "","``grid_type``", "``rectangular``", "defined in *rectgrid*", "" "","", "``displaced_pole``", "read from file in *popgrid*", "" "","", "``tripole``", "read from file in *popgrid*", "" "","", "``regional``", "read from file in *popgrid*", "" "","``grid_file``", "filename", "name of grid file to be read", "‘grid’" "","``bathymetry_file``", "filename", "name of bathymetry file to be read", "‘grid’" "","``use_bathymetry``", "true/false", "use read in bathymetry file for basalstress option", "" "","``kmt_file``", "filename", "name of land mask file to be read", "‘kmt’" "","``gridcpl_file``", "filename", "input file for coupling grid info", "" "\*","``kcatbound``", "``0``", "original category boundary formula", "0" "","", "``1``", "new formula with round numbers", "" "","", "``2``", "WMO standard categories", "" "","", "``-1``", "one category", "" "","``dxrect``", "real", "x-direction grid spacing (cm) for rectangular grid", "" "","``dyrect``", "real", "y-direction grid spacing (cm) for rectangular grid", "" "","``ncat``", "integer", "number of ice thickness categories", "5" "","``nfsd``", "integer", "number of floe size categories", "12 for prognostic FSD; 1 otherwise" "","``nilyr``", "integer", "number of vertical layers in ice", "7" "","``nslyr``", "integer", "number of vertical layers in snow", "1" "","``nblyr``", "integer", "number of zbgc layers", "7" "","", "", "", "" "","*domain_nml*", "", "", "" "","", "", "**Domain**", "" "","``nprocs``", "integer", "number of processors to use", "" "","``nx_global``", "integer", "global grid size in x direction", "" "","``ny_global``", "integer", "global grid size in y direction", "" "","``block_size_x``", "integer", "block size in x direction", "" "","``block_size_y``", "integer", "block size in y direction", "" "","``max_blocks``", "integer", "maximum number of blocks per MPI task for memory allocation", "" "","``processor_shape``", "``slenderX1``", "1 processor in the y direction (tall, thin)", "" "","", "``slenderX2``", "2 processors in the y direction (thin)", "" "","", "``square-ice``", "more processors in x than y, :math:`\sim` square", "" "","", "``square-pop``", "more processors in y than x, :math:`\sim` square", "" "","``distribution_type``", "``cartesian``", "distribute blocks in 2D Cartesian array", "" "","", "``roundrobin``", "1 block per proc until blocks are used", "" "","", "``sectcart``", "blocks distributed to domain quadrants", "" "","", "``sectrobin``", "several blocks per proc until used", "" "","", "``rake``", "redistribute blocks among neighbors", "" "","", "``spacecurve``", "distribute blocks via space-filling curves", "" "","", "``spiralcenter``", "distribute blocks via roundrobin from center of grid outward in a spiral", "" "","", "``wghtfile``", "distribute blocks based on weights specified in ``distribution_wght_file``", "" "","``distribution_wght``", "``block``", "full block size sets ``work_per_block``", "" "","", "``latitude``", "latitude/ocean sets ``work_per_block``", "" "","``distribution_wght_file``", "filename", "distribution weight file when distribution_type is ``wghtfile``", "" "","``ew_boundary_type``", "``cyclic``", "periodic boundary conditions in x-direction", "" "","", "``open``", "Dirichlet boundary conditions in x", "" "","``ns_boundary_type``", "``cyclic``", "periodic boundary conditions in y-direction", "" "","", "``open``", "Dirichlet boundary conditions in y", "" "","", "``tripole``", "U-fold tripole boundary conditions in y", "" "","", "``tripoleT``", "T-fold tripole boundary conditions in y", "" "","``maskhalo_dyn``", "true/false", "mask unused halo cells for dynamics", "" "","``maskhalo_remap``", "true/false", "mask unused halo cells for transport", "" "","``maskhalo_bound``", "true/false", "mask unused halo cells for boundary updates", "" "","", "", "", "" "","*tracer_nml*", "", "", "" "","", "", "**Tracers**", "" "","``n_aero``", "integer", "number of aerosol tracers", "1" "","``n_zaero``", "0,1,2,3,4,5,6", "number of z aerosol tracers in use", "0" "","``n_algae``", "0,1,2,3", "number of algal tracers", "0" "","``n_doc``", "0,1,2,3", "number of dissolved organic carbon", "0" "","``n_dic``", "0,1", "number of dissolved inorganic carbon", "0" "","``n_don``", "0,1", "number of dissolved organize nitrogen", "0" "","``n_fed``", "0,1,2", "number of dissolved iron tracers", "0" "","``n_fep``", "0,1,2", "number of particulate iron tracers", "0" "\*","``tr_iage``", "true/false", "ice age", "" "","``restart_age``", "true/false", "restart tracer values from file", "" "\*","``tr_FY``", "true/false", "first-year ice area", "" "","``restart_FY``", "true/false", "restart tracer values from file", "" "\*","``tr_lvl``", "true/false", "level ice area and volume", "" "","``restart_lvl``", "true/false", "restart tracer values from file", "" "\*","``tr_pond_cesm``", "true/false", "CESM melt ponds", "" "","``restart_pond_cesm``", "true/false", "restart tracer values from file", "" "\*","``tr_pond_topo``", "true/false", "topo melt ponds", "" "","``restart_pond_topo``", "true/false", "restart tracer values from file", "" "\*","``tr_pond_lvl``", "true/false", "level-ice melt ponds", "" "","``restart_pond_lvl``", "true/false", "restart tracer values from file", "" "\*","``tr_aero``", "true/false", "aerosols", "" "","``restart_aero``", "true/false", "restart tracer values from file", "" "\*","``tr_fsd``", "true/false", "floe size distribution", "" "","``restart_fsd``", "true/false", "restart floe size distribution values from file", "" "","", "", "", "" "","*thermo_nml*", "", "", "" "","", "", "**Thermodynamics**", "" "\*","``kitd``", "``0``", "delta function ITD approximation", "1" "","", "``1``", "linear remapping ITD approximation", "" "\*","``ktherm``", "``0``", "zero-layer thermodynamic model", "" "","", "``1``", "Bitz and Lipscomb thermodynamic model", "" "","", "``2``", "mushy-layer thermodynamic model", "" "","", "``-1``", "thermodynamics disabled", "" "\*","``conduct``", "``Maykut71``", "conductivity :cite:`Maykut71`", "" "","", "``bubbly``", "conductivity :cite:`Pringle07`", "" "\*","``a_rapid_mode``", "real", "brine channel diameter", "0.5x10 :math:`^{-3}` m" "\*","``Rac_rapid_mode``", "real", "critical Rayleigh number", "10" "\*","``aspect_rapid_mode``", "real", "brine convection aspect ratio", "1" "\*","``dSdt_slow_mode``", "real", "drainage strength parameter", "-1.5x10 :math:`^{-7}` m/s/K" "\*","``phi_c_slow_mode``", ":math:`0<\phi_c < 1`", "critical liquid fraction", "0.05" "\*","``phi_i_mushy``", ":math:`0<\phi_i < 1`", "solid fraction at lower boundary", "0.85" "","", "", "", "" "","*dynamics_nml*", "", "", "" "","", "", "**Dynamics**", "" "","``kdyn``", "``-1``", "dynamics OFF", "1" "","", "``0``", "dynamics OFF", "" "","", "``1``", "EVP dynamics", "" "","", "``2``", "EAP dynamics", "" "","", "``1``", "dynamics ON", "" "","``revised_evp``", "true/false", "use revised EVP formulation", "" "","``ndte``", "integer", "number of EVP subcycles", "240" "","``advection``", "``remap``", "linear remapping advection", "‘remap’" "","", "``upwind``", "donor cell advection", "" "\*","``kstrength``", "``0``", "ice strength formulation :cite:`Hibler79`", "1" "","", "``1``", "ice strength formulation :cite:`Rothrock75`", "" "\*","``krdg_partic``", "``0``", "old ridging participation function", "1" "","", "``1``", "new ridging participation function", "" "\*","``krdg_redist``", "``0``", "old ridging redistribution function", "1" "","", "``1``", "new ridging redistribution function", "" "\*","``mu_rdg``", "real", "e-folding scale of ridged ice", "" "\*","``Cf``", "real", "ratio of ridging work to PE change in ridging", "17." "","``coriolis``", "``latitude``", "Coriolis variable by latitude", "'latitude'" "","", "``constant``", "Constant coriolis value = 1.46e-4", "" "","", "``zero``", "Zero coriolis", "" "","``kridge``", "``1``", "Ridging Enabled", "1" "","", "``-1``", "Ridging Disabled", "" "","``ktransport``", "``1``", "Transport Enabled", "1" "","", "``-1``", "Transport Disabled", "" "","``basalstress``", "true/false", "use basal stress parameterization for landfast ice", "" "","``k1``", "real", "1st free parameter for landfast parameterization", "8." "","``e_ratio``", "real", "EVP ellipse aspect ratio", "2.0" "","``Ktens``", "real", "Tensile strength factor (see :cite:`Konig10`)", "0.0" "","", "", "", "" "","*shortwave_nml*", "", "", "" "","", "", "**Shortwave**", "" "\*","``shortwave``", "``ccsm3``", "NCAR CCSM3 distribution method", "" "","", "``dEdd``", "Delta-Eddington method", "" "\*","``albedo_type``", "``ccsm3``", "NCAR CCSM3 albedos", "‘default’" "","", "``constant``", "four constant albedos", "" "\*","``albicev``", ":math:`0<\alpha <1`", "visible ice albedo for thicker ice", "" "\*","``albicei``", ":math:`0<\alpha <1`", "near infrared ice albedo for thicker ice", "" "\*","``albsnowv``", ":math:`0<\alpha <1`", "visible, cold snow albedo", "" "\*","``albsnowi``", ":math:`0<\alpha <1`", "near infrared, cold snow albedo", "" "\*","``ahmax``", "real", "albedo is constant above this thickness", "0.3 m" "\*","``R_ice``", "real", "tuning parameter for sea ice albedo from Delta-Eddington shortwave", "" "\*","``R_pnd``", "real", "... for ponded sea ice albedo …", "" "\*","``R_snw``", "real", "... for snow (broadband albedo) …", "" "\*","``dT_mlt``", "real", ":math:`\Delta` temperature per :math:`\Delta` snow grain radius", "" "\*","``rsnw_mlt``", "real", "maximum melting snow grain radius", "" "\*","``kalg``", "real", "absorption coefficient for algae", "" "","", "", "", "" "","*ponds_nml*", "", "", "" "","", "", "**Melt Ponds**", "" "\*","``hp1``", "real", "critical ice lid thickness for topo ponds", "0.01 m" "\*","``hs0``", "real", "snow depth of transition to bare sea ice", "0.03 m" "\*","``hs1``", "real", "snow depth of transition to pond ice", "0.03 m" "\*","``dpscale``", "real", "time scale for flushing in permeable ice", ":math:`1\times 10^{-3}`" "\*","``frzpnd``", "``hlid``", "Stefan refreezing with pond ice thickness", "‘hlid’" "","", "``cesm``", "CESM refreezing empirical formula", "" "\*","``rfracmin``", ":math:`0 \le r_{min} \le 1`", "minimum melt water added to ponds", "0.15" "\*","``rfracmax``", ":math:`0 \le r_{max} \le 1`", "maximum melt water added to ponds", "1.0" "\*","``pndaspect``", "real", "aspect ratio of pond changes (depth:area)", "0.8" "","", "", "", "" "","*forcing_nml*", "", "", "" "","", "", "**Forcing**", "" "\*","``formdrag``", "true/false", "calculate form drag", "" "\*","``atmbndy``", "``default``", "stability-based boundary layer", "‘default’" "","", "``constant``", "bulk transfer coefficients", "" "\*","``fyear_init``", "yyyy", "first year of atmospheric forcing data", "" "\*","``ycycle``", "integer", "number of years in forcing data cycle", "" "\*","``calc_strair``", "true", "calculate wind stress and speed", "" "","", "false", "read wind stress and speed from files", "" "\*","``highfreq``", "true/false", "high-frequency atmo coupling", "" "\*","``natmiter``", "integer", "number of atmo boundary layer iterations", "" "\*","``calc_Tsfc``", "true/false", "calculate surface temperature", "``.true.``" "\*","``default_season``","``winter``", "Sets initial values of forcing and is overwritten if forcing is read in.", "" "\*","``precip_units``", "``mks``", "liquid precipitation data units", "" "","", "``mm_per_month``", "", "" "","", "``mm_per_sec``", "(same as MKS units)", "" "","", "``m_per_sec``", "", "" "\*","``tfrz_option``", "``minus1p8``", "constant ocean freezing temperature (:math:`-1.8^{\circ} C`)", "" "","", "``linear_salt``", "linear function of salinity (ktherm=1)", "" "","", "``mushy_layer``", "matches mushy-layer thermo (ktherm=2)", "" "\*","``ustar_min``", "real", "minimum value of ocean friction velocity", "0.0005 m/s" "\*","``emissivity``", "real", "emissivity of snow and ice", "0.95" "\*","``fbot_xfer_type``", "``constant``", "constant ocean heat transfer coefficient", "" "","", "``Cdn_ocn``", "variable ocean heat transfer coefficient", "" "\*","``update_ocn_f``", "true", "include frazil water/salt fluxes in ocn fluxes", "" "","", "false", "do not include (when coupling with POP)", "" "\*","``l_mpond_fresh``", "true", "retain (topo) pond water until ponds drain", "" "","", "false", "release (topo) pond water immediately to ocean", "" "\*","``oceanmixed_ice``", "true/false", "active ocean mixed layer calculation", "``.true.`` (if uncoupled)" "\*", "``wave_spec_type``", "``none``", "no wave data provided, no wave-ice interactions", "" "", "", "``constant``", "constant wave spectrum, for testing", "" "", "", "``random``", "wave spectrum generated using random number", "" "", "", "``file``", "wave spectrum read from ``wave_spec_file``", "" "\*","``restore_ocn``", "true/false", "restore sst to data", "" "\*","``trestore``", "integer", "sst restoring time scale (days)", "" "","``restore_ice``", "true/false", "restore ice state along lateral boundaries", "" "","``nfreq``", "25", "number of frequencies in ocean surface wave spectral forcing", "" "\*","``atm_data_type``", "``default``", "constant values defined in the code", "" "","", "``LYq``", "COREII Large-Yeager (AOMIP) forcing data", ":cite:`Large09`" "","", "``JRA55``", "JRA55 forcing data :cite:`Tsujino18`", "" "","", "``monthly``", "monthly forcing data", "" "","", "``ncar``", "NCAR bulk forcing data", "" "","", "``box2001``", "forcing data for :cite:`Hunke01` box problem", "" "","", "``oned``", "column forcing data", "" "","", "``hycom``", "HYCOM atm forcing data in netcdf format", "" "\*","``ocn_data_type``", "``default``", "constant values defined in the code", "" "","", "``clim``", "climatological data", "" "","", "``ncar``", "POP ocean forcing data", "" "","", "``hycom``", "HYCOM ocean forcing data in netcdf format", "Constant initial forcing" "","``bgc_data_type``", "``default``", "constant values defined in the code", "" "","", "``clim``", "climatological data", "" "","", "``ncar``", "POP ocean forcing data", "" "","", "``hycom``", "HYCOM ocean forcing data in netcdf format", "Constant initial forcing" "","``fe_data_type``", "``default``", "default forcing value for iron", "" "","", "``clim``", "iron forcing from ocean climatology", "" "","``ice_data_type``", "string", "ice initialization for special tests", "``default``" "","", "``default``", "no special initialization", "" "","", "``box2001``", "initialize ice concentration for :ref:`box2001` test (:cite:`Hunke01`)", "" "","", "``boxslotcyl``", "initialize ice concentration and velocity for :ref:`boxslotcyl` test (:cite:`Zalesak79`)", "" "","``atm_data_format``", "``nc``", "read  atmo forcing files", "" "","", "``bin``", "read direct access, binary files", "" "","``ocn_data_format``", "``nc``", "read  ocean forcing files", "" "","", "``bin``", "read direct access, binary files", "" "\*","``oceanmixed_file``", "filename", "data file containing ocean forcing data", "" "\*","``wave_spec_file``", "filename", "data file containing wave spectrum forcing data", "" "","``atm_data_dir``", "path/", "path to atmospheric forcing data directory", "" "","``ocn_data_dir``", "path/", "path to oceanic forcing data directory", "" "","``bgc_data_dir``", "path/", "path to oceanic forcing data directory", "" "","", "", "", "" "","*zbgc_nml*", "", "", "" "","", "", "**Biogeochemistry**", "More information about the BGC tuning can be found in the `Icepack Documentation `_." "\*","``tr_brine``", "true/false", "brine height tracer", "" "\*","``tr_zaero``", "true/false", "vertical aerosol tracers", "" "\*","``modal_aero``", "true/false", "modal aersols", "" "","``restore_bgc``", "true/false", "restore bgc to data", "" "","``solve_zsal``", "true/false", "update salinity tracer profile", "" "\*","``skl_bgc``", "true/false", "biogeochemistry", "" "","``bgc_flux_type``", "``Jin2006``", "ice–ocean flux velocity of :cite:`Jin06`", "" "","", "``constant``", "constant ice–ocean flux velocity", "" "","``restart_bgc``", "true/false", "restart tracer values from file", "" "","``tr_bgc_C_sk``", "true/false", "algal carbon tracer", "" "","``tr_bgc_chl_sk``", "true/false", "algal chlorophyll tracer", "" "","``tr_bgc_Am_sk``", "true/false", "ammonium tracer", "" "","``tr_bgc_Sil_sk``", "true/false", "silicate tracer", "" "","``tr_bgc_DMSPp_sk``", "true/false", "particulate DMSP tracer", "" "","``tr_bgc_DMSPd_sk``", "true/false", "dissolved DMSP tracer", "" "","``tr_bgc_DMS_sk``", "true/false", "DMS tracer", "" "","``phi_snow``", "real", "snow porosity for brine height tracer", "" "","", "", "", "" "","*icefields_nml*", "", "", "" "","", "", "*History Fields*", "" "","``f_``", "string", "frequency units for writing ```` to history", "" "","", "``y``", "write history every ``histfreq_n`` years", "" "","", "``m``", "write history every ``histfreq_n`` months", "" "","", "``d``", "write history every ``histfreq_n`` days", "" "","", "``h``", "write history every ``histfreq_n`` hours", "" "","", "``1``", "write history every time step", "" "","", "``x``", "do not write ```` to history", "" "","", "``md``", "*e.g.,* write both monthly and daily files", "" "","``f__ai``", "", "grid cell average of ```` (:math:`\times a_i`)", ""