AbstractUniversal multifractal (UM) analysis was used to investigate the scaling properties of snowfall at high temporal and spatial resolutions. Snowfall data were recorded using a 2D-video-disdrometer (2DVD) in the Swiss Alps. Six hour-long periods of snowfall, half in calm and half in light wind conditions, were selected for analysis. UManalysis was performed on reconstructed 35-m vertical columns of snowfall structure, snowfall timeseries at 100 ms resolution, and two-dimensional snowflake accumulation maps over a 5.12×5.12 cm2 area. Multifractal scaling was observed for the vertical structure of snow particle number concentration, for scales between about 35 m and 4.4 m, and sometimes down to about 0.5 m. At smaller scales, no scaling was observed. In high-resolution timeseries of snowfall, evidence of scaling was found for scales between about 7 minutes and ~26 seconds in most of the analyzed hours. Snowflake accumulations within a subset of the small sampling area of the 2DVD showed no scaling properties, suggesting homogeneous structure in snowfall at the very small (~5 cm) scale, which agrees with the results for vertical structure and timeseries.
Journal of Hydrometeorology – American Meteorological Society
Published: Jul 20, 2017
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