DOI: 10.1038/ngeo1756
论文题名: Synchronization of the climate system to eccentricity forcing and the 100,000-year problem
作者: Rial J.A. ; Oh J. ; Reischmann E.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 4 起始页码: 289
结束页码: 293
语种: 英语
Scopus关键词: amplitude
; climate oscillation
; eccentricity
; frequency analysis
; glacial-interglacial cycle
; numerical model
; paleoclimate
; solar radiation
; spectral analysis
; synchrony
英文摘要: Over the past million years, glacial-interglacial cycles have had a period of about 100,000 years, similar to the 100,000-year period of change in the eccentricity of the Earth's orbit. However, the change in incoming solar radiation - insolation - at this timescale is small, and therefore difficult to reconcile with the amplitude of the glacial cycles. This issue, known as the 100-kyr problem, is compounded by a lack of explanation for the transition of the length of the cycles from 41,000 to 100,000 years at the mid-Pleistocene transition 1.2 million years ago. Individual discrepancies have been explained, for example, through interactions between other orbital frequencies such as obliquity and the 413,000-year period of eccentricity, but a unified explanation is lacking. Here we show that climate oscillations over the past four million years can be explained by a single mechanism: the synchronization of nonlinear internal climate oscillations and the 413,000-year eccentricity cycle. Using spectral analyses aided by a numerical model, we find that the climate system first synchronized to the 413,000-year eccentricity cycle about 1.2 million years ago and has remained synchronized ever since. This synchronization results in a nonlinear transfer of power and frequency modulation that increases the amplitude of the 100,000-year cycle. We conclude that the forced synchronization can explain the strong 100,000-year glacial cycles through the alignment of insolation changes and internal climate oscillations. © 2013 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106815
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Wave Propagation Laboratory, Department of Geological Sciences, University of North Carolina, Chapel Hill, 104 South Road, Chapel Hill, NC 27599-3315, United States
Recommended Citation:
Rial J.A.,Oh J.,Reischmann E.. Synchronization of the climate system to eccentricity forcing and the 100,000-year problem[J]. Nature Geoscience,2013-01-01,6(4)