Two phases of the Holocene East African Humid Period: Inferred from a high-resolution geochemical record off Tanzania

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	Two phases of the Holocene East African Humid Period: Inferred from a high-resolution geochemical record off Tanzania
	Liu, Xiting 1,2,3; Rendle-Buehring, Rebecca 2,3; Kuhlmann, Holger 2,3; Li, Anchun 1
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2017-02-15
卷号	460 页码:123-134
关键词	African Humid Period Intertropical Convergence Zone Congo Air Boundary Holocene X-ray fluorescence scanner
英文摘要	During the Holocene, the most notably climatic change across the African continent is the African Humid Period (AHP), however the pace and primary forcing for this pluvial condition is still ambiguous, particularly in East Africa. We present a high-resolution marine sediment record off Tanzania to provide insights into the climatic conditions of inland East Africa during the Holocene. Major element ratios (i.e., log-ratios of Fe/Ca and Ti/Ca), derived from X-Ray Fluorescence scanning, have been employed to document variations in humidity in East Africa. Our results show that the AHP is represented by two humid phases: an intense humid period from the beginning of the Holocene to 8 ka (AHP I); and a moderate humid period spanning from 8 to 5.5 ka (AHP II). On the basis of our geochemical record and regime detection, the termination of the AHP initiated at 5.5 ka and ceased around 3.5 ka. Combined with other paleoclimatic records around East Africa, we suggest that the humid conditions in this region responded to Northern Hemisphere (NH) summer insolation. The AHP I and II might have been related to an eastward shift of the Congo Air Boundary and warmer conditions in the western Indian Ocean, which resulted in additional moisture being delivered from the Atlantic and Indian Oceans during the NH summer and autumn, respectively. We further note a drought event throughout East Africa north of 10 degrees S around 8.2 ka, which may have been related to the southward migration of the Intertropical Convergence Zone in response to the NH cooling event. (C) 2016 Elsevier B.V. All rights reserved.
收录类别	SCI
语种	英语
WOS记录号	WOS:000393008500014
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.qdio.ac.cn/handle/337002/136347]
专题	海洋研究所_海洋地质与环境重点实验室
作者单位	1.Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China 2.Univ Bremen, MARUM Ctr Marine Environm Sci, D-28359 Bremen, Germany 3.Univ Bremen, Fac Geosci, D-28359 Bremen, Germany
推荐引用方式 GB/T 7714	Liu, Xiting,Rendle-Buehring, Rebecca,Kuhlmann, Holger,et al. Two phases of the Holocene East African Humid Period: Inferred from a high-resolution geochemical record off Tanzania[J]. EARTH AND PLANETARY SCIENCE LETTERS,2017,460:123-134.
APA	Liu, Xiting,Rendle-Buehring, Rebecca,Kuhlmann, Holger,&Li, Anchun.(2017).Two phases of the Holocene East African Humid Period: Inferred from a high-resolution geochemical record off Tanzania.EARTH AND PLANETARY SCIENCE LETTERS,460,123-134.
MLA	Liu, Xiting,et al."Two phases of the Holocene East African Humid Period: Inferred from a high-resolution geochemical record off Tanzania".EARTH AND PLANETARY SCIENCE LETTERS 460(2017):123-134.