Breakpoint lead-lag analysis of the last deglacial climate change andatmospheric CO2 concentration on global and hemispheric scales

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	Breakpoint lead-lag analysis of the last deglacial climate change andatmospheric CO2 concentration on global and hemispheric scales
	Liu, Z(Liu, Zhi)1; Huang, SP(Huang, Shaopeng)1,2; Jin, ZD(Jin, Zhangdong)1,3; Huang, Shaopeng
	2018-10-10
发表期刊	Quaternary International
卷号	490 期号:2018 页码:50-59
文章类型	期刊论文
摘要	; Antarctic ice core records show that climate change and atmospheric CO2 concentration (aCO2) are closely related over the past 800 thousand years. However, the interpretation of their sequential, and hence the causal relationship has long been controversial. In this study, we revisit this long-standing scientific issue based on 88 well-dated high-resolution climate proxy records derived from ice cores, marine deposits, and stalagmites. We composite global and hemispheric stacks of the last deglacial climate index (DCI) using a normalization scheme instead of a more conventional area-weighting and mixing scheme to enable a better detection of temporal variations. Rampfit and Breakfit techniques are employed to detect the trend transitions in each composited DCI series and in the recently constructed centennial-scale aCO2 over the period from 22 to 9 thousand years before present. We detect a clear lead of DCI change over aCO2 variation on both global and hemispheric scales at the early stage of the deglaciation, suggesting that the variation of aCO2 is an internal feedback in Earth's climate system rather than an initial trigger of the last deglacial warming. During the periods of the Bølling-Allerød and the Younger Dryas, the climate system appeared to have been constrained by a fast coupling mechanism between climate change and aCO2 with no obvious asynchrony. The northern and southern hemispheric DCI stacks exhibit a seesawing pattern that can be linked to the influences of Atlantic meridional overturning circulation (AMOC) strength, revealing an important role of AMOC in regulating the global climate in the course of the last deglaciation.
关键词	Paleoclimatic Database Trend Analysis Rampfit Breakfit Ice Age Termination
收录类别	SCI
所属项目编号	SKLLQGZR1701
语种	英语
项目资助者	the Open Fund from the State KeyLaboratory of Loess and Quaternary Geology, Institute of EarthEnvironment, Chinese Academy of Sciences ; the Open Fund from the State KeyLaboratory of Loess and Quaternary Geology, Institute of EarthEnvironment, Chinese Academy of Sciences
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/5257
专题	加速器质谱中心
通讯作者	Huang, Shaopeng
作者单位	1.School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China 2.Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109-1063, USA 3.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China
推荐引用方式 GB/T 7714	Liu, Z,Huang, SP,Jin, ZD,et al. Breakpoint lead-lag analysis of the last deglacial climate change andatmospheric CO2 concentration on global and hemispheric scales[J]. Quaternary International,2018,490(2018):50-59.
APA	Liu, Z,Huang, SP,Jin, ZD,&Huang, Shaopeng.(2018).Breakpoint lead-lag analysis of the last deglacial climate change andatmospheric CO2 concentration on global and hemispheric scales.Quaternary International,490(2018),50-59.
MLA	Liu, Z,et al."Breakpoint lead-lag analysis of the last deglacial climate change andatmospheric CO2 concentration on global and hemispheric scales".Quaternary International 490.2018(2018):50-59.

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