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, Wenxia; Appel, Erwin; Galy, Albert; Roesler, Wolfgang; Fang, Xiaomin; Zhu, Xiuhua; Vandenberghe, Jef; Wang, Jiuyi; Berger, Andre; Lu, Shuang; Zhang, Tao
通讯作者	Han, WX (通讯作者)
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 similar to 2.7 and similar to 1.2 Ma, but a divergence of both systems started at similar to 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 similar to 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 similar to 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 similar to 0.6 Ma, and the divergence of the QB and the CLP systems. (C) 2020 Elsevier Ltd. All rights reserved.
关键词	WESTERN QAIDAM BASIN NE TIBETAN PLATEAU CHINESE LOESS PLATEAU DRILL CORE SG-1 GRAIN-SIZE SUMMER MONSOON RECURRENCE PLOTS EVOLUTION RECORD ARIDIFICATION
英文关键词	Qaidam basin; East asia summer monsoon; Ice sheet expansion; Linear and non-linear time series analysis; Orbital forcing; Westerly jet
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000582803000013
来源期刊	QUATERNARY SCIENCE REVIEWS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260092
推荐引用方式 GB/T 7714	Han, Wenxia,Appel, Erwin,Galy, Albert,et al. Climate transition in the Asia inland at 0.8-0.6 Ma related to astronomically forced ice sheet expansion[J]. 中国科学院青藏高原研究所,2020,248.
APA	Han, Wenxia.,Appel, Erwin.,Galy, Albert.,Roesler, Wolfgang.,Fang, Xiaomin.,...&Zhang, Tao.(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, Wenxia,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).