Abstract
A class of nonlinear climate models involving two simultaneously stable states, one stationary and one time-periodic, is analyzed. The evolution is cast in a universal, “normal form”, from which a basic difference between “radial” and “phase” variables emerges. In particular, it is shown that the phase variable has poor stability properties which are at the origin of progressive loss of predictability when the oscillator is autonomous. Next, the coupling to an external periodic forcing is considered. New types of solution are found, which correspond to a sharp and reproducible behavior of the phase. In this way predictability is ensured. Moreover, it is shown that the response can be considerably amplified by a mechanism of resonance with certain harmonics of the forcing. The implication of the results on the mechanism of quaternary glaciations is emphasized.
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© 1984 Springer Science+Business Media Dordrecht
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Nicolis, C. (1984). Self-Oscillations, External Forcings, and Climate Predictability. In: Berger, A., Imbrie, J., Hays, J., Kukla, G., Saltzman, B. (eds) Milankovitch and Climate. NATO ASI Series, vol 126. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-4841-4_11
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DOI: https://doi.org/10.1007/978-94-017-4841-4_11
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