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Better explanation of T0 #36

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Jun 5, 2024
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Better explanation of T0 #36

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Better explanation of T0
tlmquintino Jun 5, 2024
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tlmquintino Jun 5, 2024
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9 changes: 5 additions & 4 deletions thermofeel/thermofeel.py
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Expand Up @@ -98,14 +98,15 @@ def calculate_saturation_vapour_pressure_multiphase(t2_k, phase):
:param t2_k: (float array) 2m temperature [K]
:param phase: 0 over liquid water and 1 over ice
returns pressure of water vapor over a surface of liquid water or ice [hPa] == [mBar]
Reference: ECMWF IFS Documentation CY45R1 - Part IV : Physical processes (2018)
Reference: ECMWF IFS Documentation CY45R1 - Part IV : Physical processes (2018) pp. 116
https://doi.org/10.21957/4whwo8jw0
https://metview.readthedocs.io/en/latest/api/functions/saturation_vapour_pressure.html
"""

T0 = 273.16 # triple point of water 273.16 K (0.01 °C) at 611.73 Pa
es = np.zeros_like(t2_k)
y = (t2_k - 273.16) / (t2_k - 32.19) # over liquid water
y = (t2_k - T0) / (t2_k - 32.19) # over liquid water
es[phase == 0] = 6.1121 * np.exp(17.502 * y[phase == 0])
y = (t2_k - 273.16) / (t2_k + 0.7) # over ice
y = (t2_k - T0) / (t2_k + 0.7) # over ice
es[phase == 1] = 6.1121 * np.exp(22.587 * y[phase == 1])

return es
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