Knowledge Management System Of Institute of Earth Environment, CAS
| The 3.6-Ma aridity and westerlies history over midlatitude Asia linked with global climatic cooling | |
Fang, Xiaomin1,2,3; An, Zhisheng3,4,5; Clemens, Steven C.6; Zan, Jinbo1,2; Shi, Zhengguo3,7 ; Yang, Shengli8; Han, Wenxia9
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| Corresponding Author | Fang, Xiaomin(fangxm@itpcas.cn) ; An, Zhisheng(anzs@loess.llqg.ac.cn) |
| 2020-10-06 | |
| Source Publication | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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| ISSN | 0027-8424 |
| Volume | 117Issue:40Pages:24729-24734 |
| Abstract | 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. |
| Keyword | dust emission Taklimakan loess sequence Asian inland aridification global cooling Plio-Quaternary |
| DOI | 10.1073/pnas.1922710117 |
| WOS Keyword | LAST GLACIAL MAXIMUM ; DUST STORM ; ASTRONOMICAL CALIBRATION ; NORTH PACIFIC ; GRAIN-SIZE ; UPLIFT ; INSOLATION ; MOUNTAINS ; ICE ; PLIOCENE |
| Indexed By | SCI ; SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China ; CAS[XDB40000000] ; CAS[QYZDY-SSWDQC001] ; CAS[XDA20000000] ; Ministry of Science and Technology of China |
| WOS Research Area | Science & Technology - Other Topics |
| Funding Organization | National Natural Science Foundation of China ; CAS ; Ministry of Science and Technology of China |
| WOS Subject | Multidisciplinary Sciences |
| WOS ID | WOS:000579059100024 |
| Publisher | NATL ACAD SCIENCES |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ieecas.cn/handle/361006/15429 |
| Collection | 黄土与第四纪地质国家重点实验室（2010~） 第四纪科学与全球变化卓越创新中心 |
| Corresponding Author | Fang, Xiaomin; An, Zhisheng |
| Affiliation | 1.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China 3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China 4.Chinese Acad Sci, Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China 5.Beijing Normal Univ, Interdisciplinary Res Ctr Earth Sci Frontier, Beijing 100875, Peoples R China 6.Brown Univ, Earth Environm & Planetary Sci, Providence, RI 02912 USA 7.Pilot Natl Lab Marine Sci & Technol Qingdao, Open Studio Ocean Continental Climate & Environm, Qingdao 266061, Peoples R China 8.Lanzhou Univ, Coll Earth & Environm Sci, Minist Educ, Key Lab Western Chinas Environm Syst, Lanzhou 730000, Peoples R China 9.Linyi Univ, Sch Resource & Environm Sci, Shandong Prov Key Lab Water & Soil Conservat & En, Linyi 276000, Shandong, Peoples R China |
| Recommended Citation 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]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2020,117(40):24729-24734. |
| 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),24729-24734. |
| 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):24729-24734. |
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