Universality in snowflake aggregation

Details Universality in snowflake aggregation Universality in snowflake aggregation

2003-10-31

arxiv.org/abs/physics/0310164v2

Physics

Atmospheric and Oceanic Physics

3 pages, 4 figures, accepted to Geophysics Research Letters

Scientific paper

Aggregation of ice crystals is a key process governing precipitation. Individual ice crystals exhibit considerable diversity of shape, and a wide range of physical processes could influence their aggregation; despite this we show that a simple computer model captures key features of aggregate shape and size distribution reported recently from Cirrus clouds. The results prompt a new way to plot the experimental size distributions leading to remarkably good dynamical scaling. That scaling independently confirms that there is a single dominant aggregation mechanism at play, albeit our model (based on undeflected trajectories to contact) does not capture its form exactly.

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