气候变化领域集成服务门户(CCPortal): Holocene dust deposition in the Ili Basin and its implications for climate variations in Westerlies-dominated Central Asia

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DOI	10.1016/j.palaeo.2020.109731
	Holocene dust deposition in the Ili Basin and its implications for climate variations in Westerlies-dominated Central Asia
	Sun H.; Song Y.; Chen X.; Cheng L.; Liu H.
发表日期	2020
ISSN	0031-0182
卷号	550
英文摘要	Understanding Holocene paleoclimate in arid Central Asia (ACA) is helpful for predicting future climate. However, Holocene climate patterns and their forcing mechanisms across ACA are vigorously debated in the context of global climate change. Here, we present a Holocene loess profile (SGX) from the Ili Basin in the Westerlies-dominated Central Asia. Based on high-resolution, medium-grained (38–63 μm) quartz optically stimulated luminescence (OSL) dating, and grain size and color measurements, we reconstruct the Holocene paleoclimate. OSL geochronology indicate that this SGX loess profile covers the last 11.5 ka, and grain size analyses reveal that the sediments are sandy loess, and the environmentally sensitive fractions are <35.6 μm and 35.6–252 μm, which represent suspensions after dust storms and proximal deposit components transported mainly during dust storms, respectively. And the redness and yellowness in the loess profile are closely related to the concentrations of hematite (Hm) and goethite (Gt); the ratio Hm/Gt also can be used to reflect the evolution of dry/humid conditions in Central Asian loess. The Holocene Westerlies-dominated climate in ACA is characterized by a dry early Holocene, persistently wet conditions in the middle and late Holocene, and a climatic optimum in the late Holocene. The winter solar insolation at 60°N is considered the major forcing of Holocene climate evolution in ACA. © 2020 Elsevier B.V.
英文关键词	Color index; Grain size; Loess; OSL ages; Tianshan Mountains
语种	英语
scopus关键词	atmospheric deposition; climate variation; dust; geochronology; global climate; goethite; grain size; Holocene; luminescence dating; paleoclimate; westerly; Central Asia; Ili Basin
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150493
作者单位	State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'An, 710061, China; College of Resource Environment & Tourism, Capital Normal University, Beijing, 100048, China; Institute of Geography, Fujian Normal University, Fuzhou, 350007, China
推荐引用方式 GB/T 7714	Sun H.,Song Y.,Chen X.,et al. Holocene dust deposition in the Ili Basin and its implications for climate variations in Westerlies-dominated Central Asia[J],2020,550.
APA	Sun H.,Song Y.,Chen X.,Cheng L.,&Liu H..(2020).Holocene dust deposition in the Ili Basin and its implications for climate variations in Westerlies-dominated Central Asia.Palaeogeography, Palaeoclimatology, Palaeoecology,550.
MLA	Sun H.,et al."Holocene dust deposition in the Ili Basin and its implications for climate variations in Westerlies-dominated Central Asia".Palaeogeography, Palaeoclimatology, Palaeoecology 550(2020).