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题名: Breakpoint lead-lag analysis of the last deglacial climate change andatmospheric CO2 concentration on global and hemispheric scales
作者: Liu, Z(Liu, Zhi)1;  Huang, SP(Huang, Shaopeng)1, 2;  Jin, ZD(Jin, Zhangdong)1, 3
通讯作者: Huang, Shaopeng
关键词: Paleoclimatic database ;  Trend analysis ;  Rampfit ;  Breakfit ;  Ice age termination
刊名: Quaternary International
发表日期: 2018-10-10
卷: 490, 期:2018, 页:50-59
收录类别: SCI
文章类型: 期刊论文
摘要: 
英文摘要: 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.
语种: 英语
所属项目编号: SKLLQGZR1701
项目资助者: the Open Fund from the State KeyLaboratory of Loess and Quaternary Geology, Institute of EarthEnvironment, Chinese Academy of Sciences
内容类型: 期刊论文
URI标识: http://ir.ieecas.cn/handle/361006/5257
Appears in Collections:加速器质谱中心_期刊论文

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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

Recommended Citation:
Liu, Z,Huang, SP,Jin, ZD. 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.
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文件名: Breakpoint lead-lag analysis of the last deglacial climate change and atmospheric CO2 concentration on global and hemispheric scales.pdf
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