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Addition of Sturm (1997) & Calonne (2019) Thermal Conductivity Methods #57

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Addition of Sturm (1997) & Calonne (2019) Thermal Conductivity Methods #57

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539e46c
Update node.py
MarcusGastaldello Jan 25, 2024
50c5d30
Update constants.py
MarcusGastaldello Jan 25, 2024
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2 changes: 1 addition & 1 deletion constants.py
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@
penetrating_method = 'Bintanja95' # possibilities: 'Bintanja95'
roughness_method = 'Moelg12' # possibilities: 'Moelg12'
saturation_water_vapour_method = 'Sonntag90' # possibilities: 'Sonntag90'
thermal_conductivity_method = 'bulk' # possibilities: 'bulk', 'empirical'
thermal_conductivity_method = 'bulk' # possibilities: 'bulk', 'Huintjes15', 'Sturm97', 'Calonne19'
sfc_temperature_method = 'SLSQP' # possibilities: 'L-BFGS-B', 'SLSQP'(faster), 'Newton' (Secant, fastest)'

# WRF_X_CSPY: for efficiency and consistency
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12 changes: 9 additions & 3 deletions cosipy/cpkernel/node.py
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Expand Up @@ -187,11 +187,17 @@ def get_layer_thermal_conductivity(self):
lambda : float
Thermal conductivity [:math:`W~m^{-1}~K^{-1}`]
"""
methods_allowed = ['bulk', 'empirical']
if thermal_conductivity_method == 'bulk':
methods_allowed = ['bulk','Huintjes15','Sturm97','Calonne19']
if thermal_conductivity_method == 'bulk': # bulk-volumetric
lam = self.get_layer_ice_fraction()*k_i + self.get_layer_air_porosity()*k_a + self.get_layer_liquid_water_content()*k_w
elif thermal_conductivity_method == 'empirical':
elif thermal_conductivity_method == 'Huintjes15': # empirical parameterisation according to Huintjes et al., 2015
lam = 0.021 + 2.5 * np.power((self.get_layer_density()/1000),2)
elif thermal_conductivity_method == 'Sturm97': # empirical parameterisation according to Sturm et al., 1997
lam = 0.138 - 1.01e-3 * self.get_layer_density() + 3.23e-6 * np.power((self.get_layer_density()),2)
elif thermal_conductivity_method == 'Calonne19': # empirical parameterisation according to Calonne et al., 2019
theta = 1 / (1 + np.exp(-2 * 0.02 * (self.get_layer_density() - 450)))
lam = ((k_i * k_a / 2.107 *0.024) * ((1 - theta) * ((0.024 - (1.23e-4 * self.get_layer_density()) + (2.5e-6 * np.power(self.get_layer_density(),2)))))) + \
((k_i / 2.107) * (theta * (2.107 + 0.003618 * (self.get_layer_density() - ice_density))))
else:
raise ValueError("Thermal conductivity method = \"{:s}\" is not allowed, must be one of {:s}".format(thermal_conductivity_method, ", ".join(methods_allowed)))
return lam
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