雪花聚集的普遍性
Universality in snowflake aggregation
摘要：
冰晶的聚集是控制降水的关键过程。单个冰晶表现出相当大的多样性的形状，和广泛的物理过程可能会影响他们的聚集，尽管如此，我们表明，一个简单的计算机模型捕捉的聚集体的形状和大小分布的关键特征，最近从卷云报道。结果提示一种新的方法来绘制实验尺寸分布导致非常好的动态缩放。这种缩放独立地证实了有一种单一的主导聚集机制在起作用，尽管我们的模型（基于未偏转的接触轨迹）并没有准确地捕捉到它的形式。
英文摘要：
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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