气候变化领域集成服务门户(CCPortal): Late Pliocene Monsoonal Rainfall Gradients in Western China Recorded by the Eolian Deposits From the Linxia Basin, NE Tibetan Plateau

CCPortal

DOI	10.1029/2018JD028712
	Late Pliocene Monsoonal Rainfall Gradients in Western China Recorded by the Eolian Deposits From the Linxia Basin, NE Tibetan Plateau
	Zan, Jinbo; Fang, Xiaomin; Li, Xiaojing; Zhang, Weilin; Yan, Maodu; Shen, Miaomiao
通讯作者	Zan, JB (通讯作者)
发表日期	2018
ISSN	2169-897X
EISSN	2169-8996
起始页码	8047
结束页码	8061
卷号	123 期号:15
英文摘要	Loess and red clay sediments from the Chinese Loess Plateau (CLP) contain a wealth of information about variations in the Asian monsoon and the aridification history of the Asian interior. However, relatively little is known about late Pliocene palaeoenvironmental evolution and the variations in the gradients of monsoonal rainfall in the western part of the CLP, due to the poor exposure of pre-Quaternary eolian deposits and uncertainties in the interpretation of paleoclimatic proxies in most parts of the region. To address these issues, we conducted a detailed rock magnetic investigation of newly drilled eolian sequences (spanning 3.7-2.4Ma) from the Linxia Basin, NE Tibetan Plateau. Our results demonstrate that pedogenically formed fine magnetic grains are responsible for the magnetic enhancement of loess-red clay sediments from the basin. Spatially, a clear decrease in magnetic susceptibility and its frequency dependence is observed between the central and western CLP, indicating that the East Asian summer monsoon already exerted a major influence on the amount and distribution of late Pliocene rainfall in the Linxia Basin. After evaluating the validity of magneto-climofunctions, we attempt to reconstruct late Pliocene-early Pleistocene monsoonal precipitation in the NE margin of the Tibetan Plateau. The results demonstrate that the difference in late Pliocene monsoonal rainfall between the study area and Chaona in the central CLP was about 300-400mm. This value is higher than that of the present day, indicating a steepened gradient in monsoonal rainfall between the central and western CLP during the late Pliocene. Key Points
关键词	RED CLAY DEPOSITS LOESS PLATEAU MAGNETIC-PROPERTIES GRAIN-SIZE PALEOCLIMATIC SIGNIFICANCE ASTRONOMICAL TIMESCALE MODERN SOILS SUSCEPTIBILITY EVOLUTION CLIMATE
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000443566900015
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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/259120
推荐引用方式 GB/T 7714	Zan, Jinbo,Fang, Xiaomin,Li, Xiaojing,et al. Late Pliocene Monsoonal Rainfall Gradients in Western China Recorded by the Eolian Deposits From the Linxia Basin, NE Tibetan Plateau[J]. 中国科学院青藏高原研究所,2018,123(15).
APA	Zan, Jinbo,Fang, Xiaomin,Li, Xiaojing,Zhang, Weilin,Yan, Maodu,&Shen, Miaomiao.(2018).Late Pliocene Monsoonal Rainfall Gradients in Western China Recorded by the Eolian Deposits From the Linxia Basin, NE Tibetan Plateau.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(15).
MLA	Zan, Jinbo,et al."Late Pliocene Monsoonal Rainfall Gradients in Western China Recorded by the Eolian Deposits From the Linxia Basin, NE Tibetan Plateau".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.15(2018).