Transport in time-dependent dynamical systems: Finite-time coherent sets

Details Transport in time-dependent dynamical systems: Finite-time coherent sets Transport in time-dependent dynamical systems: Finite-time coherent sets

2010-08-10

arxiv.org/abs/1008.1613v1

Mathematics

Dynamical Systems

Scientific paper

We study the transport properties of nonautonomous chaotic dynamical systems over a finite time duration. We are particularly interested in those regions that remain coherent and relatively non-dispersive over finite periods of time, despite the chaotic nature of the system. We develop a novel probabilistic methodology based upon transfer operators that automatically detects maximally coherent sets. The approach is very simple to implement, requiring only singular vector computations of a matrix of transitions induced by the dynamics. We illustrate our new methodology on an idealized stratospheric flow and in two and three dimensional analyses of European Centre for Medium Range Weather Forecasting (ECMWF) reanalysis data.

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