DOI: 10.1007/s00382-015-2598-x
Scopus记录号: 2-s2.0-84955690754
论文题名: Inherent characteristics of sawtooth cycles can explain different glacial periodicities
作者: Omta A.W. ; Kooi B.W. ; van Voorn G.A.K. ; Rickaby R.E.M. ; Follows M.J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 46, 期: 2017-01-02 起始页码: 557
结束页码: 569
语种: 英语
英文关键词: Bifurcation
; Emergent phenomena
; Glacial-interglacial
; Mid-Pleistocene Transition
; Sawtooth cycle
英文摘要: At the Mid-Pleistocene Transition about 1 Ma, the dominant periodicity of the glacial-interglacial cycles shifted from ~40 to ~100 kyr. Here, we use a previously developed mathematical model to investigate the possible dynamical origin of these different periodicities. The model has two variables, one of which exhibits sawtooth oscillations, resembling the glacial-interglacial cycles, whereas the other variable exhibits spikes at the rapid transitions. When applying a sinusoidal forcing with a fixed period, there emerges a rich variety of cycles with different periodicities, each being a multiple of the forcing period. Furthermore, the dominant periodicity of the system can change, while the forcing periodicity remains fixed, due to either random variations or different frequency components of the orbital forcing. Two key relationships stand out as predictions to be tested against observations: (1) the amplitude and the periodicity of the cycles are approximately linearly proportional to each other, a relationship that is also found in the $$\delta ^{18}\hbox {O}$$δ18O temperature proxy. (2) The magnitude of the spikes increases with increasing periodicity and amplitude of the sawtooth. This prediction could be used to identify one or more currently hidden spiking variables driving the glacial-interglacial transitions. Essentially, the quest would be for any proxy record, concurrent with a dynamical model prediction, that exhibits deglacial spikes which increase at times when the amplitude/periodicity of the glacial cycles increases. In the specific context of our calcifier-alkalinity mechanism, the records of interest would be calcifier productivity and calcite accumulation. We believe that such a falsifiable hypothesis should provide a strong motivation for the collection of further records. © 2015, Springer-Verlag Berlin Heidelberg. 资助项目: NSF, European Research Council
; NSF, European Research Council
; ERC, European Research Council
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53881
Appears in Collections: 过去全球变化的重建
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作者单位: EAPS Department, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, United States; VU University, De Boelelaan 1081, Amsterdam, Netherlands; Biometris, Wageningen University and Research Centre, PO Box 16, Wageningen, Netherlands; Department of Earth Sciences, Oxford University, Parks Road, Oxford, United Kingdom
Recommended Citation:
Omta A.W.,Kooi B.W.,van Voorn G.A.K.,et al. Inherent characteristics of sawtooth cycles can explain different glacial periodicities[J]. Climate Dynamics,2016-01-01,46(2017-01-02)