Noise-induced chaos in non-linear dynamics of El Niños

Publication date: Available online 23 August 2018Source: Physics Letters AAuthor(s): D.V. Alexandrov, I.A. Bashkirtseva, L.B. RyashkoAbstractMotivated by an important practical significance, we analyze the noise-induced El Niño evolutionary equations. Our analysis based on the evaluation of largest Lyapunov exponents demonstrates the new effects of deterministic and stochastic dynamics of the El Niño–Southern Oscillation Events. We show that the non-linear deterministic model possesses either a multiturn limit cycle with regular self-oscillations or chaotic oscillations depending on slight variations of one of the main system parameters – the mean tropical easterlies. It is revealed that in the presence of noise, transformations of regular oscillations into chaotic ones are observed.

Source: Physics Letters A - August 23, 2018 Category: Physics Source Type: research