Abstract

Distributions of particle diameters in drifting snow with concurrent snowfall extend to larger sizes and exhibit a tendency to be bimodal compared to distributions in drifting without snowfall. An electronic system provides measures of these distributions that allow precipitation rates to be estimated even with strong transport of snow along the surface. The system uses a low-power microcomputer to accumulate signals from a photoelectric snow particle counter, facilitating real-time monitoring of conditions. Measured size distributions at five heights in the lowest 1 m above an alpine ridge crest show that falling snow crystals are concentrated in the accelerated flow.

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