Convective mass flux

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convective mass flux

An average vertical transport of mass for a field of cumulus clouds or thermals.

This mass flux Mc is given by
ams2001glos-Ce32
where ρ is air density, σ is fraction of area covered by updrafts, wup is the vertical velocity averaged across all updrafts, and wdown is the vertical velocity averaged over all downdrafts. With the mass flux, one can describe the average turbulent vertical flux of any conserved variable, such as potential temperature θ in cloudless thermals, by
ams2001glos-Ce33
where
ams2001glos-Cex07
is the vertical kinematic heat flux, θup is the potential temperature averaged across all updrafts, and θdown is the potential temperature averaged across all downdrafts. This method allows population-wide statistics to be described, without needing characteristics of individual updrafts and downdrafts.

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