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Use virtual temperature for CAPE Calculation #2093

@zhixiaozhang

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@zhixiaozhang

The MetPy documentation indicates that Convective Available Potential Energy (CAPE) is calculated using the environmental temperature (Te) profile. However, by AMS definition (https://glossary.ametsoc.org/wiki/Convective_available_potential_energy), CAPE is calculated based on environmental VIRTUAL temperature (Tve) instead of Te. Is that feasible to make the CAPE definition in MetPy consistent with AMS using Tve? This will include the effect of moisture on air density and thus positive buoyancy contributing to CAPE.

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