virtual_potential_temperature

metpy.calc.virtual_potential_temperature(pressure, temperature, mixing, molecular_weight_ratio=<Quantity(0.6219800858985514, 'dimensionless')>)

Calculate virtual potential temperature.

This calculation must be given an air parcel’s pressure, temperature, and mixing ratio. The implementation uses the formula outlined in [Markowski2010] pg.13.

Parameters

• pressure (pint.Quantity) – Total atmospheric pressure

• temperature (pint.Quantity) – The temperature

• mixing (pint.Quantity) – dimensionless mass mixing ratio

• molecular_weight_ratio (pint.Quantity or float, optional) – The ratio of the molecular weight of the constituent gas to that assumed for air. Defaults to the ratio for water vapor to dry air. (\(\epsilon\approx0.622\)).

Returns

pint.Quantity – The corresponding virtual potential temperature of the parcel

Notes

\[\Theta_v = \Theta \frac{\text{w} + \epsilon}{\epsilon\,(1 + \text{w})}\]