气候变化领域集成服务门户(CCPortal): Climate transition in the Asia inland at 0.8–0.6 Ma related to astronomically forced ice sheet expansion

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DOI	10.1016/j.quascirev.2020.106580
	Climate transition in the Asia inland at 0.8–0.6 Ma related to astronomically forced ice sheet expansion
	Han W.; Appel E.; Galy A.; Rösler W.; Fang X.; Zhu X.; Vandenberghe J.; Wang J.; Berger A.; Lü S.; Zhang T.
发表日期	2020
ISSN	0277-3791
卷号	248
英文摘要	Knowing the evolution history of the climate systems in the Asian inland dominated by either the Westerlies or the Asian monsoon, and understanding their associated driving mechanisms are crucial for assessing future trends of climate and environmental conditions in this region, but both the evolution and mechanisms are still under debate. In this study, we present a comparative analysis of massive data from an accurately dated drill core retrieved from the Westerlies controlled western Qaidam Basin (QB), with records from the Chinese Loess Plateau (CLP) dominated by the East Asia summer monsoon (EASM), to track the time and frequency domain evolution patterns and dynamic changes of the QB and the CLP systems. The results infer two main conclusions. First, a critical transition in the evolution of Qaidam paleolake occurred at 0.8–0.6 Ma, characterized by striking changes in proxy variations and a system shift from periodic variations to more irregular fluctuations after 0.6 Ma. Second, a similar evolution pattern prevailed in the Qaidam paleolake region and in the EASM-dominated CLP between ∼2.7 and ∼1.2 Ma, but a divergence of both systems started at ∼1.2 Ma and fully established after 0.6 Ma, when largely fluctuating climate conditions in the QB with a distinct drying trend was accompanied by synchronous largely fluctuated EASM with an increasing trend after 0.6 Ma. We suggest that ice sheet expansion in the Northern Hemisphere, promoted by co-occurrence of low obliquity amplitudes and low eccentricity, drove both systems across a threshold at ∼1.2 Ma, and the internal forcing due to glaciation disturbed the previous response of both systems to solar insolation and led to the divergence of two systems. At ∼0.9–0.8 Ma, a node of the 1.2-Myr obliquity cycle co-occurred with an eccentricity minimum, which together with coeval decrease in atmospheric CO2 concentration, could have facilitated a striking expansion of ice sheets. The resulting more equatorial and zonally oriented northern hemisphere westerly jet could serve as key factor leading to the final collapse of Qaidam paleolake after ∼0.6 Ma, and the divergence of the QB and the CLP systems. © 2020 Elsevier Ltd
英文关键词	East asia summer monsoon; Ice sheet expansion; Linear and non-linear time series analysis; Orbital forcing; Qaidam basin; Westerly jet
语种	英语
scopus关键词	Atmospheric thermodynamics; Core drilling; Expansion; Frequency domain analysis; Glacial geology; Glaciers; Chinese Loess Plateau; Comparative analysis; Environmental conditions; Evolution patterns; Irregular fluctuations; Northern Hemispheres; Time and frequency domains; Western Qaidam basin; Ice; astronomy; climate conditions; eccentricity; environmental conditions; historical record; ice sheet; monsoon; paleoclimate; paleoenvironment; proxy climate record; China; Loess Plateau; Qaidam Basin; Qinghai
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151281
作者单位	Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Resources and Environment Sciences, Linyi University, Linyi, 276000, China; Department of Geosciences, University of Tübingen, Hӧlderlinstr. 12, Tübingen, D-72074, Germany; Centre de Recherches Pétrographiques et Géochimiques, UMR7358, CNRS, Université de Lorraine, Vandoeuvre Les Nancy, 54500, France; Key Laboratory of Continental Collision and Plateau Uplift & Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100085, China; Center for Earth System Research and Sustainability, CliSAP, University of Hamburg, Hamburg, 20144, Germany; Department of Earth Sciences, VU University Amsterdam, De Boelelaan 1085, HV Amsterdam, 1081, Netherlands; MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing, 100037, China; Georges Lemaître Center for Earth and Climate Research, Université Catholique de Louvain, Louvain-la-Neuve, Belgium; Qing...
推荐引用方式 GB/T 7714	Han W.,Appel E.,Galy A.,等. Climate transition in the Asia inland at 0.8–0.6 Ma related to astronomically forced ice sheet expansion[J],2020,248.
APA	Han W..,Appel E..,Galy A..,Rösler W..,Fang X..,...&Zhang T..(2020).Climate transition in the Asia inland at 0.8–0.6 Ma related to astronomically forced ice sheet expansion.Quaternary Science Reviews,248.
MLA	Han W.,et al."Climate transition in the Asia inland at 0.8–0.6 Ma related to astronomically forced ice sheet expansion".Quaternary Science Reviews 248(2020).