气候变化领域集成服务门户(CCPortal): Cosmogenic Be-10 constraints on Little Ice Age glacial advances in the eastern Tian Shan, China

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DOI	10.1016/j.quascirev.2016.02.023
	Cosmogenic Be-10 constraints on Little Ice Age glacial advances in the eastern Tian Shan, China
	Li, Yanan; Li, Yingkui; Harbor, Jon; Liu, Gengnian; Yi, Chaolu; Caffee, Marc W.
通讯作者	Li, YK (通讯作者)
发表日期	2016
ISSN	0277-3791
EISSN	1873-457X
起始页码	105
结束页码	118
卷号	138
英文摘要	Presumed Little Ice Age (LIA) glacial advances, represented by a set of fresh, sharp-crested, boulder covered and compact moraines a few hundred meters downstream from modern glaciers, have been widely recognized in the Central Asian highlands. However, few studies have constrained the formation ages of these moraines. We report 31 Be-10 exposure ages from presumed LIA moraines in six glacial valleys in the Urumqi River headwater area and the Haxilegen Pass area of the eastern Tian Shan, China. Our results reveal that the maximum LIA glacial extent occurred mainly around 430 +/- 100 yr, a cold and wet period as indicated by proxy data from ice cores, tree rings, and lake sediments in Central Asia. We also dated a later glacial advance to 270 +/- 55 yr. However, Be-10 exposure ages on several presumed LIA moraines in front of small, thin glaciers are widely scattered and much older than the globally recognized timing of the LIA. Historical topographic maps indicate that most glaciers were more extensive in the early 19605, and two of our Be-10 sample sites were located close to the ice front at that time. Boulders transported by these small and thin glaciers may be reworked from deposits originally formed prior to the LIA glacial advances, producing apparently old and widely scattered exposure ages due to varied nuclide inheritance. Other published ages indicated an earlier LIA advance around 790 +/- 300 yr in the easternmost Tian Shan, but in our study area the more extensive advance around 430 +/- 100 yr likely reworked or covered deposits from this earlier event. (C) 2016 Elsevier Ltd. All rights reserved.
关键词	LATE QUATERNARY GLACIATION NORTHERN-HEMISPHERE TEMPERATURES PRODUCTION-RATE CALIBRATION TIEN-SHAN SURFACE EXPOSURE URUMQI RIVER CLIMATE-CHANGE CENTRAL-ASIA ATMOSPHERIC CIRCULATION TIBETAN PLATEAU
英文关键词	Cosmogenic nuclides; Little Ice Age glacial advances; Nuclide inheritance; Eastern Tian Shan
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000374369700009
来源期刊	QUATERNARY SCIENCE REVIEWS
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/258842
推荐引用方式 GB/T 7714	Li, Yanan,Li, Yingkui,Harbor, Jon,et al. Cosmogenic Be-10 constraints on Little Ice Age glacial advances in the eastern Tian Shan, China[J]. 中国科学院青藏高原研究所,2016,138.
APA	Li, Yanan,Li, Yingkui,Harbor, Jon,Liu, Gengnian,Yi, Chaolu,&Caffee, Marc W..(2016).Cosmogenic Be-10 constraints on Little Ice Age glacial advances in the eastern Tian Shan, China.QUATERNARY SCIENCE REVIEWS,138.
MLA	Li, Yanan,et al."Cosmogenic Be-10 constraints on Little Ice Age glacial advances in the eastern Tian Shan, China".QUATERNARY SCIENCE REVIEWS 138(2016).