An optical technique for measuring the density of snow suspended in air has been developed. This technique has the advantage of minimum interference with the air stream and of instantaneous response. Measurements of the vertical profile of snow density indicate that the eddy diffusivity for the snow must be an order of magnitude larger than the eddy viscosity obtained from the wind profile. This striking dissimilarity between mass and momentum flux is also suggested by the experiments of Mellor and Radok.
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Sommerfeld et al. (1965) studied this question.