Eddy diffusion coefficients in the stable atmospheric surface layer

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Lettau, Bernhard (2011)

The dependence of the ratio of the eddy heat diffusivity to the eddy momentum diffusivity on the Richardson number is examined in terms of the relationship between the Deacon numbers of paired wind and temperature profiles in the Antarctic surface layer. It is found empirically that for Ri? +0.1, the diffusivity ratio varies as the minus two-thirds power of the Richardson number, while for 0 < Ri < + 0.1 no clear empirical relationship exists. It is further shown that the representation of wind and temperature profiles by specific analytical expressions may involve implicit assumptions about the diffusivity ratio, and requires specific relationships between the wind and temperature profile Deacon numbers. Such relationships are not observed in this empirical study.DOI: 10.1111/j.2153-3490.1973.tb00620.x
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