Climate transition in the Asia inland at 0.8-0.6 Ma related to astronomically forced ice sheet expansion

doi:10.1016/j.quascirev.2020.106580

ISL OpenIR > 盐湖地质与环境实验室

	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
第一作者	Han, Wenxia
	2020-11-15
发表期刊	QUATERNARY SCIENCE REVIEWS
ISSN	0277-3791
卷号	248
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.
DOI	10.1016/j.quascirev.2020.106580
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/33991
专题	盐湖地质与环境实验室中国科学院青海盐湖研究所
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]. QUATERNARY SCIENCE REVIEWS,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).

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