Articles | Volume 25, issue 3
https://doi.org/10.5194/npg-25-671-2018
https://doi.org/10.5194/npg-25-671-2018
Research article
 | 
10 Sep 2018
Research article |  | 10 Sep 2018

The onset of chaos in nonautonomous dissipative dynamical systems: a low-order ocean-model case study

Stefano Pierini, Mickaël D. Chekroun, and Michael Ghil

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Short summary
A four-dimensional nonlinear spectral ocean model is used to study the transition to chaos induced by periodic forcing in systems that are nonchaotic in the autonomous limit. The analysis makes use of ensemble simulations and of the system's pullback attractors. A new diagnostic method characterizes the transition to chaos: this is found to occur abruptly at a critical value and begins with the intermittent emergence of periodic oscillations with distinct phases.