Use parcel prof for parcel mix ratio #3751
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Bumps [scipy](https://github.com/scipy/scipy) from 1.14.1 to 1.15.1. - [Release notes](https://github.com/scipy/scipy/releases) - [Commits](scipy/scipy@v1.14.1...v1.15.1) --- updated-dependencies: - dependency-name: scipy dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>
CI: (deps): Bump scipy from 1.14.1 to 1.15.1 in /ci
Use parcel temperature (parcel_profile) instead of environmental temperature (temperature) for parcel_mixing_ratio derivation. This makes a difference if you have a very high temperature point in the stratosphere.
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This is a bug fix.
In
metpy.calc.thermo.cape_cin, the parcel mixing ratio above the LCL is derived from the environment temperaturetemperatureinstead of the parcel temperatureparcel_profile.I noted this because this led to a negative mixing ratio when I worked with a test case sounding for CM1.
input_sounding_jordan_allmean: West Indies annual mean (Jordan, 1958, J. Meteor., p. 91)
in which the top level of the sounding is 40000 m, the potential temperature is 1095 K, the pressure is 10 hPa, and the temperature is 295 K. Plugging in 10 hPa and 295 K to
metpy.calc.thermo.mixing_ratio, one gets a mixing ratio of -1.006 kg/kg. A negative mixing ratio is unphysical. Now I'm not sure if the mixing_ratio function has a bug also, but the problem goes away when you replace the environment temperaturetemperaturewith the much lower parcel temperatureparcel_profilehere link to code.Description Of Changes
Change
temperaturetoparcel_profile.