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DOI	10.1073/pnas.1922710117
	The 3.6-Ma aridity and westerlies history over midlatitude Asia linked with global climatic cooling
	Fang, Xiaomin; An, Zhisheng; Clemens, Steven C.; Zan, Jinbo; Shi, Zhengguo; Yang, Shengli; Han, Wenxia
通讯作者	Fang, XM (通讯作者)
发表日期	2020
ISSN	0027-8424
起始页码	24729
结束页码	24734
卷号	117 期号:40
英文摘要	Midlatitude Asia (MLA), strongly influenced by westerlies-controlled climate, is a key source of global atmospheric dust, and plays a significant role in Earth's climate system . However, it remains unclear how the westerlies, MLA aridity, and dust flux from this region evolved over time. Here, we report a unique high-resolution eolian dust record covering the past 3.6 Ma, retrieved from the thickest loess borehole sequence (671 m) recovered to date, at the southern margin of the Taklimakan desert in the MLA interior. The results show that eolian dust accumulation, which is closely related to aridity and the westerlies, indicates existence of a dry climate, desert area, and stable land surface, promoting continuous loess deposition since at least similar to 3.6 Ma. This region experienced long-term stepwise drying at similar to 2.7, 1.1, and 0.5 Ma, coeval with a dominant periodicity shift from 41-ka cyclicity to 100-ka cyclicity between 1.1 Ma and 0.5 Ma. These features match well with global ice volume variability both in the time and frequency domains (including the Mid-Pleistocene Transition), highlighting global cooling-forced aridity and westerlies climate changes on these timescales. Numerical modeling demonstrates that global cooling can dry MLA and intensify the westerlies, which facilitates dust emission and transport, providing an interpretive framework. Increased dust may have promoted positive feedbacks (e.g., decreasing atmospheric CO2 concentrations and modulating radiation budgets), contributing to further cooling. Unraveling the long-term evolution of MLA aridity and westerlies climate is an indispensable component of the unfolding mystery of global climate change.
关键词	LAST GLACIAL MAXIMUM DUST STORM ASTRONOMICAL CALIBRATION NORTH PACIFIC GRAIN-SIZE UPLIFT INSOLATION MOUNTAINS ICE PLIOCENE
英文关键词	dust emission; Taklimakan loess sequence; Asian inland aridification; global cooling; Plio-Quaternary
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000579059100024
来源期刊	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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/260031
推荐引用方式 GB/T 7714	Fang, Xiaomin,An, Zhisheng,Clemens, Steven C.,et al. The 3.6-Ma aridity and westerlies history over midlatitude Asia linked with global climatic cooling[J]. 中国科学院青藏高原研究所,2020,117(40).
APA	Fang, Xiaomin.,An, Zhisheng.,Clemens, Steven C..,Zan, Jinbo.,Shi, Zhengguo.,...&Han, Wenxia.(2020).The 3.6-Ma aridity and westerlies history over midlatitude Asia linked with global climatic cooling.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,117(40).
MLA	Fang, Xiaomin,et al."The 3.6-Ma aridity and westerlies history over midlatitude Asia linked with global climatic cooling".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 117.40(2020).