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isotope formulae HOWTO #1683

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isotope formulae HOWTO #1683

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9195e67
fractionation factors for different S and temp
AgnieszkaZaba Jul 14, 2025
93a965f
fix args naming
AgnieszkaZaba Jul 15, 2025
2a3421d
Merge branch 'main' into fractionation
AgnieszkaZaba Nov 17, 2025
3c7b987
move to HOWTOs, start description; add badges
AgnieszkaZaba Nov 17, 2025
dc1c044
update to the latest version
AgnieszkaZaba Dec 20, 2025
69db94f
change saturation to relative humidity; fix test fig from J&M 84
AgnieszkaZaba Dec 20, 2025
49f1ace
remove resolved TODO
AgnieszkaZaba Dec 20, 2025
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8 changes: 4 additions & 4 deletions PySDM/physics/isotope_kinetic_fractionation_factors/jouzel_and_merlivat_1984.py
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Original file line number Diff line number Diff line change
Expand Up @@ -11,14 +11,14 @@ def __init__(self, _):
pass

@staticmethod
def alpha_kinetic(alpha_equilibrium, saturation, D_ratio_heavy_to_light):
def alpha_kinetic(alpha_equilibrium, relative_humidity, D_ratio_heavy_to_light):
"""eq. (11)

Parameters
----------
alpha_equilibrium
Equilibrium fractionation factor.
saturation
relative_humidity
Over liquid water or ice.
D_ratio_heavy_to_light
Diffusivity ratio for heavy to light isotope.
Expand All @@ -27,6 +27,6 @@ def alpha_kinetic(alpha_equilibrium, saturation, D_ratio_heavy_to_light):
----------
alpha_kinetic
Kinetic fractionation factor for liquid water or ice."""
return saturation / (
alpha_equilibrium / D_ratio_heavy_to_light * (saturation - 1) + 1
return relative_humidity / (
alpha_equilibrium / D_ratio_heavy_to_light * (relative_humidity - 1) + 1
)
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