干旱区生态环境知识资源中心(Arid): A 40,000-year record of aridity and dust activity at Lop Nur, Tarim Basin, northwestern China

Arid

DOI	10.1016/j.quascirev.2019.03.023
	A 40,000-year record of aridity and dust activity at Lop Nur, Tarim Basin, northwestern China
	Liu, Jian 1; Wang, Rujian 2; Zhao, Yue 1; Yang, Yi 1
通讯作者	Liu, Jian ; Wang, Rujian
来源期刊	QUATERNARY SCIENCE REVIEWS
ISSN	0277-3791
出版年	2019
卷号	211 页码:208-221
英文摘要	The Taklamakan Desert is a major dust source area for northwestern China. The history of aridification and sandstorm activity of the desert is recorded in the lacustrine sediments of the Lop Nur paleolake, on the eastern margin of the desert. In this study, we used accelerator mass spectrometry C-14 dating, the In (Al/Ca) ratio, and the grain size of the non-biogenic fraction of sediment core KY01 taken from the center of Lop Nur to produce a similar to 40 kyr record of local climate change. During mid-late Marine Isotope Stage (MIS) 3, increases in the In (Al/Ca) ratio, alluvial mud content, and atmospheric dust content, and a decrease in the dust storm content indicate an overall wet climate. During MIS 2, marked decreases in the In (Al/Ca) ratio and alluvial mud content, especially during the Last Glacial Maximum and Heinrich event 1 cold interval, indicate lowered atmospheric temperatures, as also recorded in Greenland ice cores. During MIS 2, fluvial input to the site was reduced and almost ceased, suggesting extreme aridity at Lop Nur, very strong low-altitude winds, and frequent dust storms. During early MIS 1, the contribution of dust storms to the lake sediments fell gradually and was then relatively constant, even during the Younger Dryas cold interval. This result might be ascribed to the increased supply of meltwater from snow and ice to Lop Nur, representing a response to the rise in atmospheric temperatures during the deglacial, accompanied by strong high-level winds. During 9-7 kyr BP there was an increase in the input of sediment from sandstorms, and hence an increase in low-level wind strength, possibly relating to the 8.2 kyr BP cold event. From 7.0 to similar to 1.5 kyr BP there was a decrease in sandstorm input and thus a gradual weakening of the strength of low-level winds. However, after similar to 1.5 kyr BP the sandstorm input increased. Overall, we conclude that dust storm activity in the region of Lop Nur since 40 kyr BP has been controlled mainly by Northern Hemisphere cold events, with atmospheric dust providing a background sedimentary component that was dominant during warm intervals. Our findings contribute to an improved understanding of the dynamics of dust transport and to the history of dust activity and the lacustrine sedimentary record in northwestern China. (C) 2019 Elsevier Ltd. All rights reserved.
英文关键词	Aridification Dust activity Northern hemisphere cold event Past 40 kyr Lop nur paleolake Tarim basin Northwestern China
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000466454300012
WOS关键词	GRAIN-SIZE DISTRIBUTION ; QUATERNARY ENVIRONMENTAL-CHANGES ; TIBETAN PLATEAU ; WESTERN CHINA ; LAKE-SEDIMENTS ; NORTH-ATLANTIC ; BALIKUN LAKE ; CLIMATE ; EVENT ; LOESS
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218268
作者单位	1.Chinese Acad Geol Sci, Inst Geomech, Key Lab Paleomagnetism & Tecton Reconstruct, Minist Nat Resources, Beijing 100081, Peoples R China; 2.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
推荐引用方式 GB/T 7714	Liu, Jian,Wang, Rujian,Zhao, Yue,et al. A 40,000-year record of aridity and dust activity at Lop Nur, Tarim Basin, northwestern China[J],2019,211:208-221.
APA	Liu, Jian,Wang, Rujian,Zhao, Yue,&Yang, Yi.(2019).A 40,000-year record of aridity and dust activity at Lop Nur, Tarim Basin, northwestern China.QUATERNARY SCIENCE REVIEWS,211,208-221.
MLA	Liu, Jian,et al."A 40,000-year record of aridity and dust activity at Lop Nur, Tarim Basin, northwestern China".QUATERNARY SCIENCE REVIEWS 211(2019):208-221.