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SIS_parameter_doc.all
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! This file was written by the model and records all non-layout or debugging parameters used at run-time.
! === module ice_model ===
SPECIFIED_ICE = False ! [Boolean] default = False
! If true, the ice is specified and there is no dynamics.
CGRID_ICE_DYNAMICS = True ! [Boolean] default = False
! If true, use a C-grid discretization of the sea-ice
! dynamics; if false use a B-grid discretization.
USE_SLAB_ICE = False ! [Boolean] default = False
! If true, use the very old slab-style ice.
SINGLE_ICE_STATE_TYPE = True ! [Boolean] default = True
! If true, the fast and slow portions of the ice use a
! single common ice_state_type. Otherwise they point to
! different ice_state_types that need to be explicitly
! copied back and forth.
EULERIAN_TSURF = True ! [Boolean] default = True
! If true, use previous calculations of the ice-top surface
! skin temperature for tsurf at the start of atmospheric
! time stepping, including interpolating between tsurf
! values from other categories in the same location.
ICE_OCEAN_STRESS_STAGGER = "C" ! default = "C"
! A case-insensitive character string to indicate the
! staggering of the stress field on the ocean that is
! returned to the coupler. Valid values include
! 'A', 'B', or 'C', with a default that follows the
! value of CGRID_ICE_DYNAMICS.
RHO_OCEAN = 1030.0 ! [kg m-3] default = 1030.0
! The nominal density of sea water as used by SIS.
RHO_ICE = 905.0 ! [kg m-3] default = 905.0
! The nominal density of sea ice as used by SIS.
RHO_SNOW = 330.0 ! [kg m-3] default = 330.0
! The nominal density of snow as used by SIS.
G_EARTH = 9.8 ! [m s-2] default = 9.8
! The gravitational acceleration of the Earth.
MOMENTUM_ROUGH_ICE = 1.0E-04 ! [m] default = 1.0E-04
! The default momentum roughness length scale for the ocean.
HEAT_ROUGH_ICE = 1.0E-04 ! [m] default = 1.0E-04
! The default roughness length scale for the turbulent
! transfer of heat into the ocean.
CONSTANT_COSZEN_IC = -1.0 ! [nondim] default = -1.0
! A constant value to use to initialize the cosine of
! the solar zenith angle for the first radiation step,
! or a negative number to use the current time and astronomy.
DT_RADIATION = 3600.0 ! [s] default = 3600.0
! The time step with which the shortwave radiation and
! fields like albedos are updated. Currently this is only
! used to initialize albedos when there is no restart file.
ICE_KMELT = 240.0 ! [W m-2 K-1] default = 240.0
! A constant giving the proportionality of the ocean/ice
! base heat flux to the tempature difference, given by
! the product of the heat capacity per unit volume of sea
! water times a molecular diffusive piston velocity.
SNOW_CONDUCT = 0.31 ! [W m-1 K-1] default = 0.31
! The conductivity of heat in snow.
ICE_BOUNDS_CHECK = True ! [Boolean] default = True
! If true, periodically check the values of ice and snow
! temperatures and thicknesses to ensure that they are
! sensible, and issue warnings if they are not. This
! does not change answers, but can increase model run time.
FIRST_DIRECTION = 0 ! default = 0
! An integer that indicates which direction goes first
! in parts of the code that use directionally split
! updates, with even numbers (or 0) used for x- first
! and odd numbers used for y-first.
ICE_SEES_ATMOS_WINDS = True ! [Boolean] default = True
! If true, the sea ice is being given wind stresses with
! the atmospheric sign convention, and need to have their
! sign changed.
APPLY_SLP_TO_OCEAN = False ! [Boolean] default = False
! If true, apply the atmospheric sea level pressure to
! the ocean.
MIN_H_FOR_TEMP_CALC = 0.0 ! [m] default = 0.0
! The minimum ice thickness at which to do temperature
! calculations.
DO_ICEBERGS = False ! [Boolean] default = False
! If true, call the iceberg module.
ADD_DIURNAL_SW = True ! [Boolean] default = False
! If true, add a synthetic diurnal cycle to the shortwave
! radiation.
DO_SUN_ANGLE_FOR_ALB = False ! [Boolean] default = False
! If true, find the sun angle for calculating the ocean
! albedo within the sea ice model.
DO_RIDGING = False ! [Boolean] default = False
! If true, call the ridging routines.
RESTARTFILE = "ice_model.res.nc" ! default = "ice_model.res.nc"
! The name of the restart file.
FAST_ICE_RESTARTFILE = "ice_model.res.nc" ! default = "ice_model.res.nc"
! The name of the restart file for those elements of the
! the sea ice that are handled by the fast ice PEs.
WRITE_GEOM = 1 ! default = 1
! If =0, never write the geometry and vertical grid files.
! If =1, write the geometry and vertical grid files only for
! a new simulation. If =2, always write the geometry and
! vertical grid files. Other values are invalid.
INTERPOLATE_FLUXES = True ! [Boolean] default = True
! If true, interpolate a linearized version of the fast
! fluxes into arealess categories.
REDO_FAST_ICE_UPDATE = False ! [Boolean] default = False
! If true, recalculate the thermal updates from the fast
! dynamics on the slowly evolving ice state, rather than
! copying over the slow ice state to the fast ice state.
NCAT_ICE = 5 ! [nondim] default = 5
! The number of sea ice thickness categories.
NK_ICE = 4 ! [nondim] default = 4
! The number of layers within the sea ice.
NK_SNOW = 1 ! [nondim] default = 1
! The number of layers within the snow atop the sea ice.
H_TO_KG_M2 = 1.0 ! [kg m-2 H-1] default = 1.0
! A constant that translates thicknesses from the model's
! internal units of thickness to kg m-2.
MIN_OCEAN_PARTSIZE = 0.0 ! [nondim] default = 0.0
! The minimum value for the fractional open-ocean area.
! This can be 0, but for some purposes it may be useful
! to set this to a miniscule value (like 1e-40) that will
! be lost to roundoff during any sums so that the open
! ocean fluxes can be used in with new categories.
! === module MOM_domains ===
REENTRANT_X = False ! [Boolean] default = True
! If true, the domain is zonally reentrant.
REENTRANT_Y = False ! [Boolean] default = False
! If true, the domain is meridionally reentrant.
TRIPOLAR_N = False ! [Boolean] default = False
! Use tripolar connectivity at the northern edge of the
! domain. With TRIPOLAR_N, NIGLOBAL must be even.
NIGLOBAL = 180 !
! The total number of thickness grid points in the
! x-direction in the physical domain. With STATIC_MEMORY_
! this is set in SIS2_memory.h at compile time.
NJGLOBAL = 480 !
! The total number of thickness grid points in the
! y-direction in the physical domain. With STATIC_MEMORY_
! this is set in SIS2_memory.h at compile time.
! === module MOM_hor_index ===
! Sets the horizontal array index types.
! === module SIS_initialize_fixed ===
INPUTDIR = "INPUT" ! default = "."
! The directory in which input files are found.
! === module MOM_grid_init ===
GRID_CONFIG = "mosaic" !
! A character string that determines the method for
! defining the horizontal grid. Current options are:
! mosaic - read the grid from a mosaic (supergrid)
! file set by GRID_FILE.
! cartesian - use a (flat) Cartesian grid.
! spherical - use a simple spherical grid.
! mercator - use a Mercator spherical grid.
GRID_FILE = "ocean_hgrid.nc" !
! Name of the file from which to read horizontal grid data.
TOPO_CONFIG = "file" ! default = "file"
! This specifies how bathymetry is specified:
! file - read bathymetric information from the file
! specified by (TOPO_FILE).
! flat - flat bottom set to MAXIMUM_DEPTH.
! bowl - an analytically specified bowl-shaped basin
! ranging between MAXIMUM_DEPTH and MINIMUM_DEPTH.
! spoon - a similar shape to 'bowl', but with an vertical
! wall at the southern face.
! halfpipe - a zonally uniform channel with a half-sine
! profile in the meridional direction.
TOPO_FILE = "topog.nc" ! default = "topog.nc"
! The file from which the bathymetry is read.
TOPO_VARNAME = "depth" ! default = "depth"
! The name of the bathymetry variable in TOPO_FILE.
TOPO_EDITS_FILE = "" ! default = ""
! The file from which to read a list of i,j,z topography overrides.
!MAXIMUM_DEPTH = 5495.50341796875 ! [m]
! The (diagnosed) maximum depth of the ocean.
MINIMUM_DEPTH = 0.0 ! [m] default = 0.0
! If MASKING_DEPTH is unspecified, then anything shallower than
! MINIMUM_DEPTH is assumed to be land and all fluxes are masked out.
! If MASKING_DEPTH is specified, then all depths shallower than
! MINIMUM_DEPTH but deeper than MASKING_DEPTH are rounded to MINIMUM_DEPTH.
MASKING_DEPTH = -9999.0 ! [m] default = -9999.0
! The depth below which to mask points as land points, for which all
! fluxes are zeroed out. MASKING_DEPTH is ignored if negative.
CHANNEL_CONFIG = "none" ! default = "none"
! A parameter that determines which set of channels are
! restricted to specific widths. Options are:
! none - All channels have the grid width.
! global_1deg - Sets 16 specific channels appropriate
! for a 1-degree model, as used in CM2G.
! list - Read the channel locations and widths from a
! text file, like MOM_channel_list in the MOM_SIS
! test case.
! file - Read open face widths everywhere from a
! NetCDF file on the model grid.
ROTATION = "2omegasinlat" ! default = "2omegasinlat"
! This specifies how the Coriolis parameter is specified:
! 2omegasinlat - Use twice the planetary rotation rate
! times the sine of latitude.
! betaplane - Use a beta-plane or f-plane.
! USER - call a user modified routine.
OMEGA = 7.292E-05 ! [s-1] default = 7.2921E-05
! The rotation rate of the earth.
PARALLEL_RESTARTFILES = False ! [Boolean] default = False
! If true, each processor writes its own restart file,
! otherwise a single restart file is generated
! === module hor_grid ===
! Parameters providing information about the lateral grid.
! === module MOM_hor_index ===
! Sets the horizontal array index types.
SIS_AVAILABLE_DIAGS_FILE = "SIS.available_diags" ! default = "SIS.available_diags"
! A file into which to write a list of all available
! sea ice diagnostics that can be included in a diag_table.
! === module SIS2_ice_thm (thermo) ===
! This sub-module calculates ice thermodynamic quantities.
LATENT_HEAT_FUSION = 3.34E+05 ! [J kg-1] default = 3.34E+05
! The latent heat of fusion as used by SIS.
LATENT_HEAT_VAPOR = 2.5E+06 ! [J kg-1] default = 2.5E+06
! The latent heat of vaporization of water at 0C as used by SIS.
CP_ICE = 2100.0 ! [J kg-1 K-1] default = 2100.0
! The heat capacity of fresh ice, approximated as a
! constant.
CP_SEAWATER = 4200.0 ! [J kg-1 K-1] default = 4200.0
! The heat capacity of sea water, approximated as a
! constant.
CP_BRINE = 4200.0 ! [J kg-1 K-1] default = 4200.0
! The heat capacity of water in brine pockets within the
! sea-ice, approximated as a constant. CP_BRINE and
! CP_SEAWATER should be equal, but for computational
! convenience CP_BRINE can be set equal to CP_ICE.
DTFREEZE_DS = -0.054 ! [deg C PSU-1] default = -0.054
! The derivative of the freezing temperature with salinity.
ENTHALPY_LIQUID_0 = 0.0 ! [J kg-1] default = 0.0
! The enthalpy of liquid fresh water at 0 C. The solutions
! should be physically consistent when this is adjusted,
! because only the relative value is of physical meaning,
! but roundoff errors can change the solution.
ENTHALPY_UNITS = 1.0 ! [J kg-1] default = 1.0
! A constant that rescales enthalpy from J/kg to a
! different scale in its internal representation. Changing
! this by a power of 2 is useful for debugging, as answers
! should not change. A negative values is taken as an inverse.
SUBLIMATION_BUG = False ! [Boolean] default = False
! If true use an older calculation that omits the latent
! heat of fusion from the latent heat of sublimation.
! This variable should be obsoleted as soon as possible.
! === module SIS_tracer_registry ===
! === module SIS_tracer_flow_control ===
USE_ICE_AGE_TRACER = False ! [Boolean] default = False
! If true, use the concentration based age tracer package.
SIS_FAST_AVAILABLE_DIAGS_FILE = "SIS_fast.available_diags" ! default = "SIS_fast.available_diags"
! A file into which to write a list of all available
! sea ice diagnostics that can be included in a diag_table.
! === module SIS_slow_thermo ===
! This module calculates the slow evolution of the ice mass, heat, and salt budgets.
ICE_BULK_SALINITY = 0.0 ! [g/kg] default = 4.0
! The fixed bulk salinity of sea ice.
ICE_RELATIVE_SALINITY = 0.1 ! [nondim] default = 0.0
! The initial salinity of sea ice as a fraction of the
! salinity of the seawater from which it formed.
SIS2_FILLING_FRAZIL = True ! [Boolean] default = True
! If true, apply frazil to fill as many categories as
! possible to fill in a uniform (minimum) amount of ice
! in all the thinnest categories. Otherwise the frazil is
! always assigned to a single category.
FILLING_FRAZIL_TIMESCALE = 0.0 ! [s] default = 0.0
! A timescale with which the filling frazil causes the
! thinest cells to attain similar thicknesses, or a negative
! number to apply the frazil flux uniformly.
APPLY_ICE_LIMIT = False ! [Boolean] default = False
! If true, restore the sea ice state toward climatology.
DO_ICE_RESTORE = False ! [Boolean] default = False
! If true, restore the sea ice state toward climatology.
NUDGE_SEA_ICE = False ! [Boolean] default = False
! If true, constrain the sea ice concentrations using observations.
! === module SIS2_ice_thm (updates) ===
! This sub-module does updates of the sea-ice due to thermodynamic changes.
SNOW_CONDUCTIVITY = 0.31 ! [W m-1 K-1] default = 0.31
! The conductivity of heat in snow.
ICE_CONDUCTIVITY = 2.03 ! [W m-1 K-1] default = 2.03
! The conductivity of heat in ice.
DO_POND = False ! [Boolean] default = False
! If true, calculate melt ponds and use them for
! shortwave radiation calculation.
TDRAIN = -0.8 ! [not defined] default = -0.8
! Melt ponds drain to sea level when ice average temp.
! exceeds TDRAIN (stand-in for mushy layer thermo)
R_MIN_POND = 0.15 ! [not defined] default = 0.15
! Minimum retention rate of surface water sources in melt pond
! (retention scales linearly with ice cover)
R_MAX_POND = 0.9 ! [not defined] default = 0.9
! Maximum retention rate of surface water sources in melt pond
! (retention scales linearly with ice cover)
MIN_POND_FRAC = 0.2 ! [not defined] default = 0.2
! Minimum melt pond cover (by ponds at sea level)
! pond drains to this when ice is porous.
MAX_POND_FRAC = 0.5 ! [not defined] default = 0.5
! Maximum melt pond cover - associated with pond volume
! that suppresses ice top to waterline
ICE_TEMP_RANGE_ESTIMATE = 40.0 ! [degC] default = 40.0
! An estimate of the range of snow and ice temperatures
! that is used to evaluate whether an explicit diffusive
! form of the heat fluxes or an inversion based on the
! layer heat budget is more likely to be more accurate.
! Setting this to 0 causes the explicit diffusive form.
! to always be used.
! === module SIS_dyn_trans ===
! This module updates the ice momentum and does ice transport.
DT_ICE_DYNAMICS = 600.0 ! [seconds] default = -1.0
! The time step used for the slow ice dynamics, including
! stepping the continuity equation and interactions
! between the ice mass field and velocities. If 0 or
! negative the coupling time step will be used.
ICEBERG_WINDSTRESS_BUG = False ! [Boolean] default = False
! If true, use older code that applied an old ice-ocean
! stress to the icebergs in place of the current air-ocean
! stress. This option is here for backward compatibility,
! but should be avoided.
TIMEUNIT = 8.64E+04 ! [s] default = 8.64E+04
! The time unit for ICE_STATS_INTERVAL.
ICE_STATS_INTERVAL = 10.0 ! [days] default = 1.0
! The interval in units of TIMEUNIT between writes of the
! globally summed ice statistics and conservation checks.
DT_RHEOLOGY = 50.0 ! [seconds] default = -1.0
! The sub-cycling time step for iterating the rheology
! and ice momentum equations. If DT_RHEOLOGY is negative,
! the time step is set via NSTEPS_DYN.
ICE_TDAMP_ELASTIC = -0.2 ! [s or nondim] default = -0.2
! The damping timescale associated with the elastic terms
! in the sea-ice dynamics equations (if positive) or the
! fraction of DT_ICE_DYNAMICS (if negative).
WEAK_LOW_SHEAR_ICE = False ! [Boolean] default = False
! If true, the divergent stresses go toward 0 in the C-grid
! dynamics when the shear magnitudes are very weak.
! Otherwise they go to -P_ice. This setting is temporary.
PROJECT_ICE_DRAG_VEL = True ! [Boolean] default = True
! If true, project forward the ice velocity used in the
! drag calculation to avoid an instability that can occur
! when an finite stress is applied to thin ice moving with
! the velocity of the ocean.
ICE_YIELD_ELLIPTICITY = 2.0 ! [Nondim] default = 2.0
! The ellipticity coefficient for the plastic yield curve
! in the sea-ice rheology. For an infinite ellipticity
! (i.e., a cavitating fluid rheology), use 0.
ICE_STRENGTH_PSTAR = 2.75E+04 ! [Pa] default = 2.75E+04
! A constant in the expression for the ice strength,
! P* in Hunke & Dukowicz 1997.
ICE_STRENGTH_CSTAR = 20.0 ! [nondim] default = 20.0
! A constant in the exponent of the expression for the
! ice strength, c* in Hunke & Dukowicz 1997.
ICE_CDRAG_WATER = 0.00324 ! [nondim] default = 0.00324
! The drag coefficient between the sea ice and water.
MIN_OCN_INTERTIAL_H = 0.0 ! [m] default = 0.0
! A minimum ocean thickness used to limit the viscous coupling rate
! implied for the ocean by the ice-ocean stress. Only used if positive.
ICE_DEL_SH_MIN_SCALE = 2.0 ! [nondim] default = 2.0
! A scaling factor for the lower bound on the shear rates
! used in the denominator of the stress calculation. This
! probably needs to be greater than 1.
PROJECT_ICE_CONCENTRATION = True ! [Boolean] default = True
! If true, project the evolution of the ice concentration
! due to the convergence or divergence of the ice flow.
CFL_TRUNCATE = 0.5 ! [nondim] default = 0.5
! The value of the CFL number that will cause ice velocity
! components to be truncated; instability can occur past 0.5.
CFL_TRUNC_DYN_ITS = False ! [Boolean] default = False
! If true, check the CFL number for every iteration of the
! rheology solver; otherwise only the final velocities that
! are used for transport are checked.
NSTEPS_ADV = 1 ! default = 1
! The number of advective iterations for each slow time
! step.
RECATEGORIZE_ICE = True ! [Boolean] default = True
! If true, readjust the distribution into ice thickness
! categories after advection.
SEA_ICE_ROLL_FACTOR = 1.0 ! [Nondim] default = 1.0
! A factor by which the propensity of small amounts of
! thick sea-ice to become thinner by rolling is increased
! or 0 to disable rolling. This can be thought of as the
! minimum number of ice floes in a grid cell divided by
! the horizontal floe aspect ratio. Sensible values are
! 0 (no rolling) or larger than 1.
SIS_THICKNESS_ADVECTION_SCHEME = "PCM" ! default = "UPWIND_2D"
! The horizontal transport scheme for thickness:
! UPWIND_2D - Non-directionally split upwind
! PCM - Directionally split piecewise constant
! PLM - Piecewise Linear Method
! PPM:H3 - Piecewise Parabolic Method (Huyhn 3rd order)
SIS_CONTINUITY_SCHEME = "PCM" ! default = "UPWIND_2D"
! The horizontal transport scheme used in continuity:
! UPWIND_2D - Non-directionally split upwind
! PCM - Directionally split piecewise constant
! PPM:C2PD - Positive definite PPM with 2nd order edge values
! PPM:C2MO - Monotonic PPM with 2nd order edge values
CONT_PPM_VOLUME_BASED_CFL = False ! [Boolean] default = False
! If true, use the ratio of the open face lengths to the
! tracer cell areas when estimating CFL numbers.
! === module SIS_tracer_advect ===
SIS_TRACER_ADVECTION_SCHEME = "PPM:H3" ! default = "UPWIND_2D"
! The horizontal transport scheme for tracers:
! UPWIND_2D - Non-directionally split upwind
! PCM - Directionally split piecewise constant
! PLM - Piecewise Linear Method
! PPM:H3 - Piecewise Parabolic Method (Huyhn 3rd order)
! === module SIS_sum_output ===
WRITE_STOCKS = True ! [Boolean] default = True
! If true, write the integrated tracer amounts to stdout
! when the statistics files are written.
STDOUT_HEARTBEAT = True ! [Boolean] default = True
! If true, periodically write sea ice statistics to
! stdout to allow the progress to be seen.
MAXTRUNC = 200 ! [truncations save_interval-1] default = 0
! The run will be stopped, and the day set to a very
! large value if the velocity is truncated more than
! MAXTRUNC times between writing ice statistics.
! Set MAXTRUNC to 0 to stop if there is any truncation
! of sea ice velocities.
STATISTICS_FILE = "seaice.stats" ! default = "seaice.stats"
! The file to use to write the globally integrated
! statistics.
! === module SIS_fast_thermo ===
! This module applies rapidly varying heat fluxes to the ice and does an implicit surface temperature calculation.
REORDER_0C_HEATFLUX = False ! [Boolean] default = False
! If true, rearrange the calculation of the heat fluxes
! projected back to 0C to work on each contribution
! separately, so that they can be indentically replicated
! if there is a single fast timestep per coupled timestep
! and REDO_FAST_ICE_UPDATE=True.
MAX_TSKIN_ITT = 10 ! default = 10
! The maximum number of iterations of the skin temperature
! and optical properties during redo_update_ice_model_fast.
! === module SIS2_ice_thm (updates) ===
! This sub-module does updates of the sea-ice due to thermodynamic changes.
! === module SIS_optics ===
! This module calculates the albedo and absorption profiles for shortwave radiation.
DO_DELTA_EDDINGTON_SW = True ! [Boolean] default = True
! If true, a delta-Eddington radiative transfer calculation
! for the shortwave radiation within the sea-ice.
ICE_DELTA_EDD_R_ICE = 1.0 ! [nondimensional] default = 0.0
! A dreadfully documented tuning parameter for the radiative
! propeties of sea ice with the delta-Eddington radiative
! transfer calculation.
ICE_DELTA_EDD_R_SNOW = 1.0 ! [nondimensional] default = 0.0
! A dreadfully documented tuning parameter for the radiative
! propeties of snow on sea ice with the delta-Eddington
! radiative transfer calculation.
ICE_DELTA_EDD_R_POND = 1.0 ! [nondimensional] default = 0.0
! A dreadfully documented tuning parameter for the radiative
! propeties of meltwater ponds on sea ice with the delta-Eddington
! radiative transfer calculation.
! === module MOM_file_parser ===
SEND_LOG_TO_STDOUT = False ! [Boolean] default = False
! If true, all log messages are also sent to stdout.
DOCUMENT_FILE = "SIS_parameter_doc" ! default = "MOM_parameter_doc"
! The basename for files where run-time parameters, their
! settings, units and defaults are documented. Blank will
! disable all parameter documentation.
COMPLETE_DOCUMENTATION = True ! [Boolean] default = True
! If true, all run-time parameters are
! documented in SIS_parameter_doc.all .
MINIMAL_DOCUMENTATION = True ! [Boolean] default = True
! If true, non-default run-time parameters are
! documented in SIS_parameter_doc.short .