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DOI	10.1016/j.gsf.2021.101180
	Aeolian dust dynamics in the Fergana Valley, Central Asia, since similar to 30 ka inferred from loess deposits
	Li, Yue; Song, Yougui; Kaskaoutis, Dimitris G.; Zan, Jinbo; Orozbaev, Rustam; Tan, Liangcheng; Chen, Xiuling
通讯作者	Song, YG (通讯作者)
发表日期	2021
ISSN	1674-9871
卷号	12 期号:5
英文摘要	Knowledge of the interactions among atmospheric dynamics, dust emissions and climate system is essential to understand the physical mechanisms for the dust lifecycle, their role in loess formation as well as the predictions of future dust concentration. However, these issues still remain relatively poorly known in Central Asia (CA). The extensive loess deposits on the CA pediments provide a promising archive to explore atmospheric dust dynamics and climatic conditions in the past and their association with loess formation. This study investigates the granulometric and magnetic properties of a loess section (named Osh section) in the Fergana Valley, which provides a sensitive record of atmospheric dust dynamics since 30 ka based on radiometric (AMS C-14) dating. The frequency-dependent magnetic susceptibility (chi(fd)) and the mean grain size are used to reconstruct the broad-scale effective moisture and summer atmospheric dynamics pattern in CA, respectively. The results show that the precession forcing exerts a huge influence on the wind-regime variabilities in CA, but with different physical processes under the impact of the Northern Hemisphere ice sheet (NHIS) before and after 15 ka. The origin of the sedimentation rate variations in the Osh loess is also linked to the NHIS-modulated changes of the atmospheric circulation patterns. Either the strengthened westerlies or the increased surface roughness from higher vegetation cover in loess-deposition areas have significantly accelerated the loess accumulation. As a result, these complicated influence factors of sedimentation rate change in the Osh loess section, especially during the Holocene epoch, may hamper accessibility of the authentic dust emission flux and atmospheric dust concentration in CA. (C) 2021 ChinaUniversity of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V.
关键词	ATMOSPHERIC CIRCULATION PATTERNS ARID CENTRAL-ASIA INTERGLACIAL-GLACIAL CYCLE GRAIN-SIZE DISTRIBUTIONS LATE QUATERNARY LOESS CHINESE LOESS PALEOSOL SEQUENCE MAGNETIC-SUSCEPTIBILITY LATE PLEISTOCENE NORTH-ATLANTIC
英文关键词	Dust dynamics; Climate; Atmospheric patterns; Loess; Ice volume; Fergana Valley
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000692319300008
来源期刊	GEOSCIENCE FRONTIERS
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/260484
推荐引用方式 GB/T 7714	Li, Yue,Song, Yougui,Kaskaoutis, Dimitris G.,et al. Aeolian dust dynamics in the Fergana Valley, Central Asia, since similar to 30 ka inferred from loess deposits[J]. 中国科学院青藏高原研究所,2021,12(5).
APA	Li, Yue.,Song, Yougui.,Kaskaoutis, Dimitris G..,Zan, Jinbo.,Orozbaev, Rustam.,...&Chen, Xiuling.(2021).Aeolian dust dynamics in the Fergana Valley, Central Asia, since similar to 30 ka inferred from loess deposits.GEOSCIENCE FRONTIERS,12(5).
MLA	Li, Yue,et al."Aeolian dust dynamics in the Fergana Valley, Central Asia, since similar to 30 ka inferred from loess deposits".GEOSCIENCE FRONTIERS 12.5(2021).