= Buoyancy fraction of total turbulent sinks
{title2=$J=B/(B+\epsilon)$}
With positive stable buoyancy destruction $B$ and positive dissipation $\epsilon$, this normalized sink fraction need not equal the <Flux Richardson number> $B/P$ away from equilibrium. If $R=(B+\epsilon)/P$, then $J=\mathrm{Ri}_f/R$. In the <fixed-correlation equilibrium model for stratified turbulence>, a minimum of $R=a/q+bq$ has $B=\epsilon$, hence $J=1/2$. The actual flux Richardson number there is $R_{\min}/2$ and equals $1/2$ only when that minimum also satisfies the equilibrium condition $R=1$.
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