气候变化领域集成服务门户(CCPortal): The 3.6-Ma aridity and westerlies history over midlatitude Asia linked with global climatic cooling

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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 X.; An Z.; Clemens S.C.; Zan J.; Shi Z.; Yang S.; Han W.
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 bywesterlies-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 thewesterlies, 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 ∼3.6 Ma. This region experienced long-term stepwise drying at ∼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. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Asian inland aridification; Dust emission; Global cooling; Plio-Quaternary; Taklimakan loess sequence
语种	英语
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/160775
作者单位	Fang, X., Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China, Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710075, China; An, Z., State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710075, China, Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi'an, 710061, China, Interdisciplinary Research Center of Earth Science Frontier, Beijing Normal University, Beijing, 100875, China; Clemens, S.C., Earth Environmental and Planetary Sciences, Brown University, Providence, RI 02912, United States; Zan, J., Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China, Key La...
推荐引用方式 GB/T 7714	Fang X.,An Z.,Clemens S.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 X..,An Z..,Clemens S.C..,Zan J..,Shi Z..,...&Han W..(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 X.,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).