VERTICAL DIFFUSIVITY COEFFICIENT IN A THERMOCLINE

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Abstract
Two equations are presented giving the vertical eddy diffusivity coefficient Kz in the thermocline of a well‐stratified lake as a function of its lake mean rate of downward displacement and intensity. Both equations are derived by transforming the heat transport equation onto a quasi‐Lagrangian coordinate system, the origin of which moves down with the lake mean thermocline depth. Application of the equations to Lake Ontario yields summer mean values of Kz in the thermocline of 0.02 to 0.07 cm2/sec. During an exceptionally quiet period in July and August 1967, Kz approached the value of molecular diffusivity.

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