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fix mlcape if parcel_start_pressure != bottom #3147

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merged 4 commits into from
Nov 15, 2023
Merged

fix mlcape if parcel_start_pressure != bottom #3147

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5dc6011
fix mlcape if parcel_start_pressure != bottom
wx4stg Aug 10, 2023
429caf2
fix spacing
wx4stg Aug 10, 2023
f524187
Merge branch 'main' of https://github.com/unidata/metpy into ml_cape_…
wx4stg Nov 14, 2023
e90cdf6
split that test
wx4stg Nov 15, 2023
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7 changes: 4 additions & 3 deletions src/metpy/calc/thermo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3011,13 +3011,14 @@ def mixed_layer_cape_cin(pressure, temperature, dewpoint, **kwargs):

"""
depth = kwargs.get('depth', units.Quantity(100, 'hPa'))
start_p = kwargs.get('parcel_start_pressure', pressure[0])
parcel_pressure, parcel_temp, parcel_dewpoint = mixed_parcel(pressure, temperature,
dewpoint, **kwargs)

# Remove values below top of mixed layer and add in the mixed layer values
pressure_prof = pressure[pressure < (pressure[0] - depth)]
temp_prof = temperature[pressure < (pressure[0] - depth)]
dew_prof = dewpoint[pressure < (pressure[0] - depth)]
pressure_prof = pressure[pressure < (start_p - depth)]
temp_prof = temperature[pressure < (start_p - depth)]
dew_prof = dewpoint[pressure < (start_p - depth)]
pressure_prof = concatenate([parcel_pressure, pressure_prof])
temp_prof = concatenate([parcel_temp, temp_prof])
dew_prof = concatenate([parcel_dewpoint, dew_prof])
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4 changes: 4 additions & 0 deletions tests/calc/test_thermo.py
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Expand Up @@ -1549,6 +1549,10 @@ def test_mixed_layer_cape_cin(multiple_intersections):
mlcape, mlcin = mixed_layer_cape_cin(pressure, temperature, dewpoint)
assert_almost_equal(mlcape, 1132.706800436 * units('joule / kilogram'), 2)
assert_almost_equal(mlcin, -13.4809966289 * units('joule / kilogram'), 2)
mlcape_middle, mlcin_middle = mixed_layer_cape_cin(pressure, temperature, dewpoint,
parcel_start_pressure=800 * units.hPa)
assert_almost_equal(mlcape_middle, 0 * units('joule / kilogram'), 2)
assert_almost_equal(mlcin_middle, 0 * units('joule / kilogram'), 2)
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def test_mixed_layer():
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