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Initial implementation of CAPE calculation

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Initial implementation of CAPE calculation; need to fix EL calculation
to achieve valid results
This commit is contained in:
XANTRONIX 2025-03-09 14:40:29 -04:00
parent 00f623f5ae
commit 25540d0ef7
1 changed files with 45 additions and 4 deletions
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49
lib/xmet/sounding.py
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@ -9,7 +9,10 @@ from xmet.list import nearest
from xmet.series import Series, SeriesIntersection
from xmet.thermo import follow_dry_adiabat, \
follow_moist_adiabat, \
follow_saturated_mixing_ratio
follow_saturated_mixing_ratio, \
pressure_height, \
kelvin, \
celsius
LAPSE_RATE_DRY = 9.8 # degrees C per 1000m
LAPSE_RATE_MOIST = 4.0
@ -184,7 +187,41 @@ class Sounding(DatabaseTable):
return series
def between(n, a, b):
return n > a and n < b
class SoundingParameters():
@staticmethod
def cape(temp_line: Series,
moist_adiabat: Series,
lfc: tuple[float],
el: tuple[float]) -> float:
cape = 0.0
p_lfc, p_el = lfc[1], el[1]
neighbors = temp_line.neighbors(moist_adiabat)
gph_last = None
for pair in neighbors:
p_env, p_parcel = pair
if not between(p_env, p_el, p_lfc):
continue
t_env = kelvin(temp_line[p_env])
t_parcel = kelvin(moist_adiabat[p_parcel])
gph = pressure_height(p_env)
if gph_last is not None:
gph_delta = gph - gph_last
cape += (((t_parcel) - (t_env)) / (t_env)) * gph_delta
gph_last = gph
return cape
@staticmethod
def from_sounding(sounding: Sounding) -> Self:
temp_line = sounding.follow_temp()
@ -202,8 +239,12 @@ class SoundingParameters():
el = moist_adiabat.intersect(temp_line, SeriesIntersection.LESSER, lfc[1])
params = SoundingParameters()
params.lcl = lcl
params.lfc = lfc
params.el = el
params.lcl = lcl
params.lfc = lfc
params.el = el
params.cape = SoundingParameters.cape(temp_line,
moist_adiabat,
lfc,
el)
return params