def physics_options(self, input_file, step):
"Options corresponding to modeling choices."
config_filename = self.config(step)
options = [
"-energy none", # isothermal setup; allows selecting cold-mode flow laws
"-ssa_flow_law isothermal_glen", # isothermal setup
"-yield_stress constant",
"-tauc %e" % MISMIP.C(self.experiment),
"-pseudo_plastic",
"-gradient eta",
"-pseudo_plastic_q %e" % MISMIP.m(self.experiment),
"-pseudo_plastic_uthreshold %e" % MISMIP.secpera(),
"-calving ocean_kill", # calving at the present front
"-ocean_kill_file %s" % input_file,
"-config_override %s" % config_filename,
"-ssa_method fd",
"-cfbc", # calving front boundary conditions
"-part_grid", # sub-grid front motion parameterization
"-ssafd_ksp_rtol 1e-7",
"-ys 0",
"-ye %d" % MISMIP.run_length(self.experiment, step),
"-options_left",
]
if self.model == 1:
options.extend(["-stress_balance ssa"])
else:
options.extend([
"-stress_balance ssa+sia",
"-sia_flow_law isothermal_glen", # isothermal setup
])
return options
def plot_flux(in_file, out_file):
print(
"Reading %s to plot ice flux for model %s, experiment %s, grid mode %s, step %s"
% (in_file, model, experiment, mode, step))
if out_file is None:
out_file = os.path.splitext(in_file)[0] + "-flux.pdf"
x = read(in_file, 'x')
flux_mag = read(in_file, 'flux_mag')
# plot positive xs only
flux_mag = flux_mag[x >= 0]
x = x[x >= 0]
figure(2)
hold(True)
plot(x / 1e3, flux_mag, 'k.-', markersize=10, linewidth=2)
plot(x / 1e3, x * MISMIP.a() * MISMIP.secpera(), 'r:', linewidth=1.5)
title("MISMIP experiment %s, step %d" % (experiment, step))
xlabel("x ($\mathrm{km}$)", size=14)
ylabel(r"flux ($\mathrm{m}^2\,\mathrm{a}^{-1}$)", size=14)
print("Saving '%s'...\n" % out_file)
savefig(out_file, dpi=300, facecolor='w', edgecolor='w')
def physics_options(self, input_file, step):
"Options corresponding to modeling choices."
config_filename = self.config(step)
options = ["-energy none", # isothermal setup; allows selecting cold-mode flow laws
"-ssa_flow_law isothermal_glen", # isothermal setup
"-yield_stress constant",
"-tauc %e" % MISMIP.C(self.experiment),
"-pseudo_plastic",
"-gradient eta",
"-pseudo_plastic_q %e" % MISMIP.m(self.experiment),
"-pseudo_plastic_uthreshold %e" % MISMIP.secpera(),
"-calving ocean_kill", # calving at the present front
"-ocean_kill_file %s" % input_file,
"-config_override %s" % config_filename,
"-ssa_method fd",
"-cfbc", # calving front boundary conditions
"-part_grid", # sub-grid front motion parameterization
"-ssafd_ksp_rtol 1e-7",
"-ys 0",
"-ye %d" % MISMIP.run_length(self.experiment, step),
"-options_left",
]
if self.model == 1:
options.extend(["-stress_balance ssa"])
else:
options.extend(["-stress_balance ssa+sia",
"-sia_flow_law isothermal_glen", # isothermal setup
])
return options
def plot_flux(in_file, out_file):
print("Reading %s to plot ice flux for model %s, experiment %s, grid mode %s, step %s" % (
in_file, model, experiment, mode, step))
if out_file is None:
out_file = os.path.splitext(in_file)[0] + "-flux.pdf"
x = read(in_file, 'x')
flux_mag = read(in_file, 'flux_mag')
# plot positive xs only
flux_mag = flux_mag[x >= 0]
x = x[x >= 0]
figure(2)
hold(True)
plot(x / 1e3, flux_mag, 'k.-', markersize=10, linewidth=2)
plot(x / 1e3, x * MISMIP.a() * MISMIP.secpera(), 'r:', linewidth=1.5)
title("MISMIP experiment %s, step %d" % (experiment, step))
xlabel("x ($\mathrm{km}$)", size=14)
ylabel(r"flux ($\mathrm{m}^2\,\mathrm{a}^{-1}$)", size=14)
print("Saving '%s'...\n" % out_file)
savefig(out_file, dpi=300, facecolor='w', edgecolor='w')
def physics_options(self, step):
"Options corresponding to modeling choices."
config_filename = self.config(step)
options = [
"-cold", # allow selecting cold-mode flow laws
"-sia_flow_law isothermal_glen", # isothermal setup
"-ssa_flow_law isothermal_glen", # isothermal setup
"-no_energy", # isothermal setup
"-ssa_sliding", # use SSA
"-hold_tauc",
"-tauc %e" % MISMIP.C(self.experiment),
"-pseudo_plastic",
"-gradient eta",
"-pseudo_plastic_q %e" % MISMIP.m(self.experiment),
"-pseudo_plastic_uthreshold %e" % MISMIP.secpera(),
"-ocean_kill", # calving at the present front
"-config_override %s" % config_filename,
"-ssa_method fd", # use the FD solver that includes PIK improvements
"-cfbc", # calving front boundary conditions
"-part_grid", # sub-grid front motion parameterization
"-ksp_rtol 1e-7",
"-ys 0",
"-ye %f" % MISMIP.run_length(self.experiment, step),
"-options_left",
]
if self.model == 1:
options.extend(["-no_sia"])
else:
options.extend(["-sia"])
if self.mode in (2, 3):
options.extend(["-skip", "-skip_max 10"])
return options
def pism_bootstrap_file(filename,
step,
v0,
H0,
calving_front=1750e3,
N=None,
p="default"):
import PISMNC
xx = x(N)
yy = y(xx)
print("dx", xx[1] - xx[0])
v0 = v0 / MISMIP.secpera()
#H0 = 800.0
Q0 = H0 * v0
topg = bed_topography(xx)
thk = thickness(xx, step, Q0, H0, calving_front, p)
smb = surface_mass_balance(xx)
temp = ice_surface_temp(xx)
vel = Q0 / np.maximum(thk, eps) * MISMIP.secpera()
vel[thk == 0.0] = 0.0
#vel = np.nan_to_num(Q0/thk)*MISMIP.secpera()
bcm = bcmask(xx)
vel0 = np.zeros_like(vel)
okill = ocean_kill(thk)
nc = PISMNC.PISMDataset(filename, 'w', format="NETCDF3_CLASSIC")
nc.create_dimensions(xx, yy)
nc.define_2d_field('topg',
attrs={
'units': 'm',
'long_name': 'bedrock surface elevation',
'standard_name': 'bedrock_altitude'
})
nc.write('topg', topg)
nc.define_2d_field('thk',
attrs={
'units': 'm',
'long_name': 'ice thickness',
'standard_name': 'land_ice_thickness'
})
nc.write('thk', thk)
nc.define_2d_field(
'climatic_mass_balance',
attrs={
'units': 'kg m-2 / s',
'long_name':
'ice-equivalent surface mass balance (accumulation/ablation) rate',
'standard_name': 'land_ice_surface_specific_mass_balance_flux'
})
nc.write('climatic_mass_balance', smb)
nc.define_2d_field(
'ice_surface_temp',
attrs={
'units':
'Kelvin',
'long_name':
'annual average ice surface temperature, below firn processes'
})
nc.write('ice_surface_temp', temp)
nc.define_2d_field('land_ice_area_fraction_retreat',
attrs={
'units': '',
'long_name': 'mask where -ocean_kill cuts off ice'
})
nc.write('land_ice_area_fraction_retreat', okill)
nc.define_2d_field('u_ssa_bc', attrs={'units': 'm/yr'})
nc.write('u_ssa_bc', vel)
nc.define_2d_field('v_ssa_bc', attrs={'units': 'm/yr'})
nc.write('v_ssa_bc', vel0)
nc.define_2d_field('bc_mask', attrs={})
nc.write('bc_mask', bcm)
nc.close()