Logarithmic bred vectors in spatiotemporal chaos: structure and growth

Details Logarithmic bred vectors in spatiotemporal chaos: structure and growth Logarithmic bred vectors in spatiotemporal chaos: structure and growth

2010-05-25

arxiv.org/abs/1005.4562v1

Phys. Rev. E 81, 066204 (2010)

Nonlinear Sciences

Chaotic Dynamics

8 pages, 8 figures

Scientific paper

10.1103/PhysRevE.81.066204

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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