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Resonant phenomena in extended chaotic systems subject to external noise: The Lorenz'96 case.

Journal: Physica A
Year: 2008   Volume: 387
Initial page: 3103   Last page: 3110
Status: Published
In this status since: 1 Mar 2008
PDF file: 2008_revelli_jpa.pdf
DOI: /10.1016/j.physa.2008.01.110
Authors:
Revelli, J., , Wio, H.

We have investigated the effects of noise on an extended chaotic system. The chosen model is the Lorenz’96, a type of “toy” model used for climate studies. Through the analysis of the system’s time evolution and its time and space correlations, we have obtained numerical evidence for two distinct stochastic resonance-like behaviors. Such behaviors are seen when both the usual and a generalized signal-to-noise ratio functions are depicted as a function of the external noise intensity, or of the system size. The underlying mechanisms seem to be associated with a noise-induced chaos reduction. The possible relevance of these and other
findings for an optimal climate prediction are discussed.