Resonant phenomena in extended chaotic systems subject to external noise: The Lorenz `96 model case

JORGE A. REVELLI, MIGUAL A. RODRIGUEZ, HORACIO S. WIO

PHYSICA A - STATISTICAL AND THEORETICAL PHYSICS

Elsevier B.V.

Año: 2008 vol. 387 p. 3103 - 3110

0378-4371

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.