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arXiv 1005.4562nlin.CD
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时空混沌中的对数繁殖向量:结构与生长

Logarithmic bred vectors in spatiotemporal chaos: structure and growth

Sarah Hallerberg, Diego Pazó, Juan M. López, Miguel A. Rodríguez

摘要:

Bred矢量是一种有限扰动,用于表现空间扩展混沌的大气模式的预测研究。我们研究了对数繁殖向量的结构、空间相关性和增长率。我们发现,经过适当的变换,对数繁殖向量大致分段副本的领先李雅普诺夫向量。这一事实使我们能够推导出繁殖矢量增长率作为其幅度的函数的比例律。此外,我们将增长率与对应于最扩展方向的李雅普诺夫指数谱相关联。我们用Lorenz '96模型的模拟来说明我们的结果。

英文摘要:

Bred vectors are a type of finite perturbation used in prediction studies of atmospheric models that exhibit spatially extended chaos. We study the structure, spatial correlations, and the growth- rates of logarithmic bred vectors (which are constructed by using a given norm). We find that, after a suitable transformation, logarithmic bred vectors are roughly piecewise copies of the leading Lyapunov vector. This fact allows us to deduce a scaling law for the bred vector growth rate as a function of their amplitude. In addition, we relate growth rates with the spectrum of Lyapunov exponents corresponding to the most expanding directions. We illustrate our results with simulations of the Lorenz '96 model.

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