# Buoyancy velocity

From AMS Glossary

## buoyancy velocity

A vertical velocity scale

*w*_{B}for convective boundary layers, that is related to the buoyant driving force for convection and the depth*z*_{i}of the mixed layer:where

*g*is gravitational acceleration,*T*_{vML}and θ_{vML}are the average absolute virtual temperature and average virtual potential temperature in the mixed layer, respectively, and θ_{vSfc}is the virtual potential temperature of the surface skin. It is related to the Deardorff velocity,*w*_{*}, by*w*_{B}≈ 13*w*_{*}.