DOI: 10.1029/2018JD028712
Scopus记录号: 2-s2.0-85052219566
论文题名: Late Pliocene Monsoonal Rainfall Gradients in Western China Recorded by the Eolian Deposits From the Linxia Basin, NE Tibetan Plateau
作者: Zan J. ; Fang X. ; Li X. ; Zhang W. ; Yan M. ; Shen M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 15 起始页码: 8047
结束页码: 8061
语种: 英语
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 3.7–2.4 Ma) 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 300–400 mm. 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. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113261
Appears in Collections: 气候减缓与适应
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作者单位: Center for Excellence in Tibetan Plateau Earth Sciences and Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Zan J.,Fang X.,Li X.,et al. Late Pliocene Monsoonal Rainfall Gradients in Western China Recorded by the Eolian Deposits From the Linxia Basin, NE Tibetan Plateau[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(15)