Abstract
The vertical eddy diffusivity for heat, Kz, which characterizes the intensity of vertical mixing, was estimated for depths below the epilimnion in Castle Lake, California, calculated from a series of temperature profiles collected during summer 1972 suitably corrected for solar radiation absorption. Kz was usually much larger than the molecular value of diffusivity, indicating that thermal energy is transported in the vertical almost entirely by turbulent mechanisms, even below the epilimnion. Further, Kz varied significantly with depth and was well described in the region of high stratification by the form Kz = b(N2)m, where m = −0.40 ± 0.02 and N2 =(Brunt‐Vaisala frequency)2, a result close to a previous theoretical prediction.
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