CISM Component Model Namelist Variables

Space-delimited list of variables output to history file

Default: 'acab artm thk usurf uvel vvel uflx vflx temp'

Determines whether extra diagnostics are printed in the cism log file

Default: false

Input file

Default: For startup runs, a resolution-dependent initial conditions file (e.g., gland10.input.nc)
         For branch/hybrid runs, a restart file name built based on RUN_REFCASE and RUN_REFDATE

Name of top-level configuration file for Glimmer Glacier model
(Determined by scripts -- cannot be set by user)

Variable name for fraction

Default: LANDFRAC

Filename of file to specify horizontal grid resolution

Default: resolution-dependent (e.g., grid file for 0.9x1.25 deg)

How grid is being specified: from file or internally
Currently, only 'file' is supported

Default: file

Variable name for mask

Default: LANDMASK

Whether leap years are enabled in the GLC time manager.
CAUTION: Leap years don't work correctly with GLC time steps longer than a few months.

Default: .false.

Character to separate date values

Default: '-'

Time step, in units given by dt_option
This generally should not be changed

Default: set based on NCPL_BASE_PERIOD and GLC_NCPL in env_run.xml,
so that there is one GLC time step per coupling period

GLC time-step units
This generally should not be changed
Valid values: steps_per_year, steps_per_day, seconds, hours

Default: set based on NCPL_BASE_PERIOD and GLC_NCPL in env_run.xml,
so that there is one GLC time step per coupling period

Starting day number in month

Default: comes from RUN_STARTDATE or RUN_REFDATE

Starting hour of the day

Default: 0

Starting minute of the day

Default: 0

Starting month number

Default: comes from RUN_STARTDATE or RUN_REFDATE

Starting second of the minute

Default: 0

Starting year number

Default: comes from RUN_STARTDATE or RUN_REFDATE

Simulation identifier (ie case name)

Default: case name set by create_newcase

Stop option -- always let the coupler stop the model so use 'never'.

Default: 'never'

Node spacing in x-direction (m)

Default: resolution-dependent

Node spacing in y-direction (m)

Default: resolution-dependent

Number of nodes in x-direction

Default: resolution-dependent

Number of nodes in y-direction

Default: resolution-dependent

Number of nodes in z-direction

Default: 11

List of sigma levels, in ascending order, separated by spaces
These run between 0.0 (at top surface) and 1.0 (at lower surface)

Default: 0.00 0.15 0.30 0.45 0.60 0.75 0.83 0.90 0.95 0.98 1.00

Mass-balance model to use.
In the CESM context, this should be set to 0 (receive surface mass balance from climate model)

Default: 0

Ice time-step multiplier: allows asynchronous climate-ice coupling

Default: 1

Flag to control if mean-preserving interpolation is used
0: Do not use mean-preserving interpolation
1: Use mean-preserving interpolation

Default: 0

Method of precipitation downscaling:
1: Use large-scale precipitation rate
2: Use parameterization of Roe and Lindzen

Default: 1

Central latitude (degrees north)

Default: 90.0

Central longitude (degrees east)

Default: 321.0

False easting (m)

Default: 800000.0

False northing (m)

Default: 3400000.0

Scale factor; only relevant for the Stereographic projection

Default: 0.0

Location of standard parallel(s) (degrees north)
Up to two standard parallels may be specified (depending on the projection)

Default: 71.0

String specifying the map projection type
Valid values: LAEA, AEA, LCC, STERE

Default: STERE

0: not in continuity equation
1: in continuity equation

Default: 0

Determines the treatment of basal water
0: local water balance
1: local water balance plus constant flux
2: no basal water (any basal water is instantly removed and does not affect the dynamics)

Default: 2

-1: no evolution
0: pseudo-diffusion
1: ADI scheme
2: diffusion

Default: 0

0: Paterson-Budd temperature-dependent relationship
1: uniform value equal to the Paterson-Budd value at -5 deg C
2: constant value, taken from default_flwa

Default: 0

Hotstart the model if set to 1. 
This option only affects the way the initial temperature and flow factor distribution is calculated.

Default: 0 for startup, 1 for hybrid/branch

0: ignore marine margin
1: set thickness to zero if floating
2: set thickness to zero if relaxed bedrock is below a given depth (marine_limit)
3: lose a specified fraction of floating ice
4: set thickness to zero if current bedrock is below a given depth (marine_limit)

Default: 1

Basal traction parameter
0: no basal sliding
1: constant basal traction coefficient
2: constant coefficient where basal water is present, else no sliding
3: coefficient is a linear function of basal water depth
4: coefficient is proportional to basal melt rate
5: constant coefficient where the basal temperature is at the pressure melting point, else no sliding

Default: 0

Determines the temperature solution method
0: isothermal: set column to surface air temperature
1: full temperature solution

Default: 1

0: relaxed topography is read from a separate variable
1: first time slice of input topography is assumed to be relaxed
2: first time slice of input topography is assumed to be in isostatic equilibrium with ice thickness

Default: 0

Method of integration used to obtain vertical velocity
0: standard vertical integration
1: vertical integration constrained to obey an upper kinematic boundary condition

Default: 0

Ice sheet timestep (years)
Must translate into an integer number of hours

Default: 0.05 years for 5km, 0.1 years for 10km and 20km

x coordinate of point for diagnostic output

Default: resolution-dependent

y coordinate of point for diagnostic output

Default: resolution-dependent

Number of ice sheet timesteps between each diagnostic output to log file

Default: Set so that there is one diagnostic print per year

Multiplier of ice sheet timestep, dt
(in theory, can be real-valued, but values less than 1 are not handled properly, so restricted to being an integer)

Default: 1

Multiplier of ice sheet timestep, dt
(in theory, can be real-valued, but values less than 1 are not handled properly, so restricted to being an integer)

Default: 1

Array of five values corresponding to various basal traction parameters.
Currently, only the first value is used, and this only applies in the case where slip_coeff = 1, 2 or 5.
This first value has units of (m yr-1 Pa-1), and is the inverse of beta-squared in the linear relationship:
    tauB = -1*(beta-squared)*u

Default: 2 10 10 0 1

Basal water field smoothing strength

Default: 0.01

Fraction of ice lost to calving

Default: 0.8

The flow law is enhanced with this factor.
The greater the value, the lower the viscosity and the faster the ice will flow.

Default: 3

Constant geothermal heat flux (W m-2)
(May be overwritten by a spatially-varying field in input file [bheatflx])

Default: -0.05

Time scale for basal water to drain (yr-1)
(Not relevant for basal_water=2)

Default: 1000.

Thickness below which ice dynamics is ignored (m)
Below this limit, ice is only accumulated

Default: 100.

Set to a value between 0 (no messages) and 6 (all messages)

Default: 6

All ice is assumed lost once water depths reach this value (for marine_margin=2 or 4) (m)
Note that water depth is negative

Default: -200.

thermal conductivity of lithosphere (W m-1 K-1)
Only relevant if do_gthf is .true.

Default: 3.3

Determines whether the GTHF (geothermal heat flux) section is output to the cism.config file.

Default: false

Number of vertical layers
Only relevant if do_gthf is .true.

Default: 20

1: 1D calculations
3: 3D calculations
Only relevant if do_gthf is .true.

Default: 1

Number of time steps for spinning up GTHF calculations
Only relevant if do_gthf is .true.

Default: 0

Density of lithosphere (kg m-3)
Only relevant if do_gthf is .true.

Default: 3300

Depth below sea-level at which geothermal heat gradient is applied (m)
Only relevant if do_gthf is .true.

Default: -5000

Specific heat capacity of lithosphere (J kg-1 K-1)
Only relevant if do_gthf is .true.

Default: 1000

Initial surface temperature (degrees C)
Only relevant if do_gthf is .true.

Default: 2

0: fluid mantle, isostatic adjustment happens instantaneously
1: relaxing mantle, mantle is approximated by a half-space
Only relevant if do_isostasy is .true.

Default: 0

Determines whether the isostasy section is output to the cism.config file.

Default: false

0: local lithosphere, equilibrium bedrock depression is found using Archimedes' principle
1: elastic lithosphere, flexural rigidity is taken into account
Only relevant if do_isostasy is .true.

Default: 0

Characteristic time constant of relaxing mantle (years)
Only relevant if do_isostasy is .true.

Default: 4000.

Lithosphere update period (years)
Only relevant if do_isostasy is .true.

Default: 500.

Flexural rigidity of the lithosphere
Only relevant if 'lithosphere' is set to 1

Default: 0.24e25