Resonant phenomena in extended chaotic systems subject to external noise: the Lorenz'96 model case

TL;DR

This study explores how time-correlated noise influences chaotic extended systems, specifically the Lorenz'96 model, revealing stochastic resonance-like phenomena that could impact climate prediction accuracy.

Contribution

It demonstrates the occurrence of stochastic resonance-like behavior in the Lorenz'96 model under external noise, highlighting a noise-induced reduction of chaos as a key mechanism.

Findings

Identification of stochastic resonance-like behavior in the model

Evidence of noise-induced chaos reduction

Implications for optimal climate prediction

Abstract

We investigate the effects of a time-correlated noise on an extended chaotic system. The chosen model is the Lorenz'96, a kind 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 stochastic resonance-like behavior. Such behavior is seen when both, the usual and a generalized signal-to-noise ratio function are depicted as a function of the external noise intensity or the system size. The underlying mechanism seems to be associated to a "noise-induced chaos reduction". The possible relevance of these and other findings for an "optimal" climate prediction are discussed.