气候变化领域集成服务门户(CCPortal): A 40;000-year record of aridity and dust activity at Lop Nur; Tarim Basin; northwestern China

CCPortal

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 J.; Wang R.; Zhao Y.; Yang Y.
发表日期	2019
ISSN	0277-3791
起始页码	208
结束页码	221
卷号	211
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 14 C dating, the ln (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 ∼40 kyr record of local climate change. During mid–late Marine Isotope Stage (MIS) 3, increases in the ln (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 ln (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 ∼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 ∼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. © 2019 Elsevier Ltd
英文关键词	Aridification; Dust activity; Lop nur paleolake; Northern hemisphere cold event; Northwestern China; Past 40 kyr; Tarim basin
语种	英语
scopus关键词	Atmospheric temperature; Atmospheric thermodynamics; Climate change; Glacial geology; Landforms; Mass spectrometry; Sedimentology; Sediments; Storms; Wind; Aridification; Lop nur paleolake; Northern Hemispheres; Northwestern China; Past 40 kyr; Tarim Basin; Dust; aridification; aridity; dust; dust storm; grain size; Heinrich event; ice core; lacustrine deposit; lacustrine environment; Last Glacial Maximum; marine isotope stage; meltwater; Northern Hemisphere; paleoenvironment; sediment core; Younger Dryas; Arctic; China; Greenland; Greenland Ice Sheet; Lop Nur; Taklimakan Desert; Tarim Basin; Xinjiang Uygur
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151959
作者单位	Institute of Geomechanics, Chinese Academy of Geological Sciences, Key Laboratory of Paleomagnetism and Tectonic Reconstruction, Ministry of Natural Resources, Beijing, 100081, China; State Key Laboratory of Marine Geology, Tongji University, Shanghai, 200092, China
推荐引用方式 GB/T 7714	Liu J.,Wang R.,Zhao Y.,et al. A 40;000-year record of aridity and dust activity at Lop Nur; Tarim Basin; northwestern China[J],2019,211.
APA	Liu J.,Wang R.,Zhao Y.,&Yang Y..(2019).A 40;000-year record of aridity and dust activity at Lop Nur; Tarim Basin; northwestern China.Quaternary Science Reviews,211.
MLA	Liu J.,et al."A 40;000-year record of aridity and dust activity at Lop Nur; Tarim Basin; northwestern China".Quaternary Science Reviews 211(2019).