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arXiv 0706.2296nlin.CDphysics.ao-phphysics.flu-dyn
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重力作用下平流气溶胶的分形聚类特征

Signatures of fractal clustering of aerosols advected under gravity

Rafael Dias Vilela, Tamás Tél, Alessandro P. S. de Moura, Celso Grebogi

摘要:

在混沌平流作用下的气溶胶常常接近一个奇异吸引子。它们在这个分形集上无序地运动,但在重力存在的情况下,它们有一个向下的净垂直运动。在实际情况中,可能只有在某一特定水平,例如在地面水平,才能获得观测数据。我们揭示了两个分形签名的混沌平流气溶胶重力作用下。每一个使计算的分形维数$D_{0}$的奇异吸引子管理的平流动力学仅在一个给定的水平获得的数据。我们用数值实验说明了我们的理论研究结果,并讨论了它们与气象学的可能相关性。

英文摘要:

Aerosols under chaotic advection often approach a strange attractor. They move chaotically on this fractal set but, in the presence of gravity, they have a net vertical motion downwards. In practical situations, observational data may be available only at a given level, for example at the ground level. We uncover two fractal signatures of chaotic advection of aerosols under the action of gravity. Each one enables the computation of the fractal dimension $D_{0}$ of the strange attractor governing the advection dynamics from data obtained solely at a given level. We illustrate our theoretical findings with a numerical experiment and discuss their possible relevance to meteorology.

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