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Implement mixing_ratio_temp()

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XANTRONIX 2025-03-07 13:58:58 -05:00
parent 8b8cfb3add
commit 7c9af22d51
1 changed files with 22 additions and 0 deletions
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22
lib/xmet/thermo.py
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@ -1,3 +1,5 @@
import math
from typing import Callable from typing import Callable
LAPSE_RATE_DRY = 9.8 / 1000 # degrees C per km LAPSE_RATE_DRY = 9.8 / 1000 # degrees C per km
@ -10,6 +12,9 @@ PRESSURE_STEP = 50
def kelvin(c: float) -> float: def kelvin(c: float) -> float:
return 273.15 + c return 273.15 + c
def celsius(k: float) -> float:
return k - 273.15
def vapor_pressure(dewpoint: float) -> float: def vapor_pressure(dewpoint: float) -> float:
""" """
Return the pressure, in millibar, of vapor in a parcel of a given Return the pressure, in millibar, of vapor in a parcel of a given
@ -42,6 +47,23 @@ def saturated_mixing_ratio(temp: float, pressure: float) -> float:
return (0.62197 * es) / (pressure - es) return (0.62197 * es) / (pressure - es)
def mixing_ratio_temp(ratio: float, pressure: float) -> float:
"""
Return the temperature, in degrees celsius, of a given mixing ratio at a
specified pressure, in millibar.
"""
c1 = 0.0498646455
c2 = 2.4082965
c3 = 7.07475
c4 = 38.9114
c5 = 0.0915
c6 = 1.2035
x = math.log10(ratio * pressure / (622.0 + ratio))
return celsius(math.pow(10.0, ((c1 * x) + c2)) - c3 + \
(c4 * math.pow((math.pow(10, (c5 * x)) - c6), 2)))
def lcl(temp: float, dewpoint: float) -> float: def lcl(temp: float, dewpoint: float) -> float:
""" """
Return the height, in meters, at which a parcel of the given temperature Return the height, in meters, at which a parcel of the given temperature