Land-ice Framework

extrapolate

The landice framework module compass/landice/extrapolate.py provides a function for extrapolating variables into undefined regions. It is copied from a similar script in MPAS-Tools.

mesh

The config options below should be defined for all mesh_gen test cases (although not necessarily with the same values shown here, which are the defaults for the 1–10km Humboldt mesh).

A core set of options is always required: levels, x_min/x_max/y_min/y_max, cull_distance, min_spac, max_spac, and the five density-function toggles use_speed, use_dist_to_edge, use_dist_to_grounding_line, use_dist_to_coast, and use_bed.

The remaining mesh-density parameters are only required when their corresponding toggle is enabled, so configs that disable a density function may omit the associated options entirely:

use_speed = True requires high_log_speed and low_log_speed.
use_dist_to_edge = True or use_dist_to_grounding_line = True requires high_dist and low_dist.
use_dist_to_coast = True requires high_dist_coast and low_dist_coast.
use_bed = True requires high_dist_bed, low_dist_bed, high_bed, and low_bed.

# config options for humboldt test cases
[mesh]

# number of levels in the mesh
levels = 10

# Bounds of Humboldt domain. If you want the extent
# of the gridded dataset to determine the extent of
# the MALI domain, set these to None.
x_min = -630000.
x_max = 84000.
y_min = -1560000.
y_max = -860000.

# distance from ice margin to cull (km).
# Set to a value <= 0 if you do not want
# to cull based on distance from margin.
cull_distance = 5.0

# mesh density parameters
# minimum cell spacing (meters)
min_spac = 1.e3
# maximum cell spacing (meters)
max_spac = 1.e4

# mesh density functions
use_speed = True
use_dist_to_grounding_line = False
use_dist_to_edge = True
# When use_dist_to_coast = True, also set high_dist_coast and low_dist_coast
use_dist_to_coast = False
use_bed = True

# Required when use_speed = True
# log10 of max speed (m/yr) for cell spacing
high_log_speed = 2.5
# log10 of min speed (m/yr) for cell spacing
low_log_speed = 0.75

# Required when use_dist_to_edge = True or
# use_dist_to_grounding_line = True
# distance at which cell spacing = max_spac (meters)
high_dist = 1.e5
# distance within which cell spacing = min_spac (meters)
low_dist = 1.e4

# Required when use_dist_to_coast = True
# distance at which cell spacing in ocean = max_spac (meters)
high_dist_coast = 16.e3
# distance within which cell spacing in ocean = min_spac (meters)
low_dist_coast = 8.e3

# Required when use_bed = True
# distance at which bed topography has no effect
high_dist_bed = 1.e5
# distance within which bed topography has maximum effect
low_dist_bed = 5.e4
# Bed elev beneath which cell spacing is minimized
low_bed = 50.0
# Bed elev above which cell spacing is maximized
high_bed = 100.0