Vertical turbulent buoyancy flux ($B_0=\overline{w^{\prime }{b}^{\prime }}$)

The covariance of vertical velocity and buoyancy fluctuations has dimensions length squared per time cubed. It supplies buoyancy production in the local turbulent kinetic energy balance. This local flux density differs dimensionally from the section-integrated buoyancy flux of a plume, which includes an area or width integration.