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Addition of Yen (1981) Specific Heat Capacity #58

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Addition of Yen (1981) Specific Heat Capacity #58

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3585011
Update constants.py
MarcusGastaldello Jan 25, 2024
ffd21b7
Update node.py
MarcusGastaldello Jan 25, 2024
15bb707
Update node.py
MarcusGastaldello Jan 25, 2024
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1 change: 1 addition & 0 deletions constants.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
roughness_method = 'Moelg12' # possibilities: 'Moelg12'
saturation_water_vapour_method = 'Sonntag90' # possibilities: 'Sonntag90'
thermal_conductivity_method = 'bulk' # possibilities: 'bulk', 'empirical'
specific_heat_capacity_method = 'bulk' # possibilities: 'bulk', 'Yen81'
sfc_temperature_method = 'SLSQP' # possibilities: 'L-BFGS-B', 'SLSQP'(faster), 'Newton' (Secant, fastest)'

# WRF_X_CSPY: for efficiency and consistency
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10 changes: 9 additions & 1 deletion cosipy/cpkernel/node.py
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Expand Up @@ -131,7 +131,15 @@ def get_layer_specific_heat(self):
cp : float
Specific heat [:math:`J~kg^{-1}~K^{-1}`]
"""
return self.get_layer_ice_fraction()*spec_heat_ice + self.get_layer_air_porosity()*spec_heat_air + self.get_layer_liquid_water_content()*spec_heat_water

methods_allowed = ['bulk','Yen81']
if specific_heat_capacity_method == 'bulk':
cp = self.get_layer_ice_fraction() * spec_heat_ice + self.get_layer_air_porosity() * spec_heat_air + self.get_layer_liquid_water_content() * spec_heat_water
elif specific_heat_capacity_method == 'Yen81': # empirical parameterisation according to Yen, 1981
cp = 152.2 + 7.122 * self.get_layer_temperature()
else:
raise ValueError("Specific heat method = \"{:s}\" is not allowed, must be one of {:s}".format(specific_heat_capacity_method, ", ".join(methods_allowed)))
return cp

def get_layer_liquid_water_content(self):
""" Returns the liquid water content of the node.
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