Abstract
Motivated by important geophysical applications and climate impact, we study stochastically-induced dynamics of El Niño-Southern Oscillation events based on the classical Vallis model. Our analysis demonstrates new dynamical scenarios of the El Niño events: direct transitions from equilibrium to the large-amplitude oscillations and the effect of stochastic excitation of spikes in a zone where the deterministic model can only have stable equilibria. We also show a decisive role of the noise and easterlies intensities on stochastic dynamics.
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