Journal Article10.1103/PHYSREVLETT.88.038501
Abrupt glacial climate changes due to stochastic resonance.
TL;DR: It is demonstrated that a combination of weak periodic forcing and plausible-amplitude stochastic fluctuations of the freshwater flux into the northern North Atlantic can produce glacial warm events similar in time evolution, amplitude, spatial pattern, and interspike intervals to those found in the observed climate records.
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Abstract: Using an ocean-atmosphere climate model we demonstrate that stochastic resonance could be an important mechanism for millennial-scale climate variability during glacial times. We propose that the glacial ocean circulation, unlike today's, was an excitable system with a stable and a weakly unstable mode of operation, and that a combination of weak periodic forcing and plausible-amplitude stochastic fluctuations of the freshwater flux into the northern North Atlantic can produce glacial warm events similar in time evolution, amplitude, spatial pattern, and interspike intervals to those found in the observed climate records.
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References
A Pervasive Millennial-Scale Cycle in North Atlantic Holocene and Glacial Climates
Gerard C. Bond,William J. Showers,Maziet Cheseby,Rusty Lotti,Peter Almasi,Peter B deMenocal,Paul Priore,Heidi Cullen,Irka Hajdas,Georges Bonani +9 more
TL;DR: In this paper, the North Atlantic deep sea cores reveal that abrupt shifts punctuated what is conventionally thought to have been a relatively stable Holocene climate, and they make up a series of climate shifts with a cyclicity close to 1470 ± 500 years, which is the most recent manifestation of a pervasive millennial-scale climate cycle operating independently of the glacial-interglacial climate state.
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Origin and consequences of cyclic ice rafting in the Northeast Atlantic Ocean during the past 130,000 years
TL;DR: In this paper, the influence of Earth's orbital parameters on major ice rafting was examined using deep-sea sediment cores recovered from the Northeast Atlantic Ocean in order to elucidate the influence.
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Coherence Resonance in a Noise-Driven Excitable System
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TL;DR: In this paper, the effects of external noise on the dynamics of the excitable Fitz Hugh Nagumo system were investigated. And the authors showed that the coherence of these noise-induced oscillations is maximal for a certain noise amplitude.
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Rapid changes of glacial climate simulated in a coupled climate model.
TL;DR: It is found that only one mode of Atlantic Ocean circulation is stable: a cold mode with deep water formation in the Atlantic Ocean south of Iceland; this provides an explanation why glacial climate is much more variable than Holocene climate.