The timing and structure of the 8.2 ka event revealed through high-resolution speleothem records from northwestern Madagascar

doi:10.1016/j.quascirev.2021.107104

IEECAS OpenIR > 黄土与第四纪地质国家重点实验室（2010~）

	The timing and structure of the 8.2 ka event revealed through high-resolution speleothem records from northwestern Madagascar
	Duan, Pengzhen 1; Li, Hanying 1; Sinha, Ashish 2; Voarintsoa, Ny Riavo G.3; Kathayat, Gayatri 1; Hu, Peng 4; Zhang, Haiwei 1; Ning, Youfeng 1; Cheng, Hai 1,5,6
通讯作者	Li, Hanying(hanyingli@xjtu.edu.cn) ; Cheng, Hai(cheng021@xjtu.edu.cn)
	2021-09-15
发表期刊	QUATERNARY SCIENCE REVIEWS
ISSN	0277-3791
卷号	268 页码:9
摘要	Although the 8.2 ka event is a well-known globally documented abrupt climate event, its detailed expression in tropical southeastern Africa is poorly constrained. Here we present a high resolution and precisely dated record of the regional hydroclimatic variability between 8.5-7.5 ka BP from a polymorphic speleothem (ABC-1) from northwestern Madagascar. In combination with the exclusive recurrences of calcite layers (indicative of wetter conditions), the distinctly negative excursions in the ABC-1 delta O-18 record manifest a wet 8.2 ka event that spanned from 8.230 to 8.053 ka BP. The event is characterized by the replacement of shorter-term (interannual to interdecadal) delta O-18-delta C-13 coherence with the longer-term (multidecadal to centennial) coherence, suggesting a stable and well-developed forest system during the 8.2 ka event. Our data reveal a two-stage structure of the 8.2 ka event, which is superimposed with two brief pluvial episodes in each stage. The widely documented two peaks/troughs during Stage-I suggest rapid propagation of climate signal through atmospheric processes triggered initially by the freshwater forcing, whereas the divergent behaviors of the peaks/troughs in Stage-II in different climate systems may suggest a different forcing. (C) 2021 Elsevier Ltd. All rights reserved.
关键词	Speleothem Madagascar The 8.2 ka event Two-stage structure
DOI	10.1016/j.quascirev.2021.107104
关键词[WOS]	AFRICAN HUMID PERIOD ; CLIMATE-CHANGE ; ATLANTIC REGION ; ANJOHIBE CAVE ; VARIABILITY ; STALAGMITES ; FREQUENCY ; MONSOON ; PHASES ; OCEAN
收录类别	SCI ; SCI
语种	英语
资助项目	National Natural Science Foundation of China[41888101] ; National Natural Science Foundation of China[41731174] ; Frontier Institute of Science and Technology, Xi'an Jiaotong University, China
WOS研究方向	Physical Geography ; Geology
项目资助者	National Natural Science Foundation of China ; Frontier Institute of Science and Technology, Xi'an Jiaotong University, China
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000692518500004
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/16976
专题	黄土与第四纪地质国家重点实验室（2010~）
通讯作者	Li, Hanying; Cheng, Hai
作者单位	1.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Peoples R China 2.Calif State Univ Dominguez Hills, Dept Earth Sci, Carson, CA 90747 USA 3.Univ Houston, Dept Earth & Atmospher Sci, Houston, TX 77204 USA 4.Chinese Acad Sci, Inst Atmospher Phys, Beijing 100190, Peoples R China 5.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China 6.CAGS, Inst Karst Geol, Key Lab Karst Dynam, MLR, Guilin 541004, Peoples R China
推荐引用方式 GB/T 7714	Duan, Pengzhen,Li, Hanying,Sinha, Ashish,et al. The timing and structure of the 8.2 ka event revealed through high-resolution speleothem records from northwestern Madagascar[J]. QUATERNARY SCIENCE REVIEWS,2021,268:9.
APA	Duan, Pengzhen.,Li, Hanying.,Sinha, Ashish.,Voarintsoa, Ny Riavo G..,Kathayat, Gayatri.,...&Cheng, Hai.(2021).The timing and structure of the 8.2 ka event revealed through high-resolution speleothem records from northwestern Madagascar.QUATERNARY SCIENCE REVIEWS,268,9.
MLA	Duan, Pengzhen,et al."The timing and structure of the 8.2 ka event revealed through high-resolution speleothem records from northwestern Madagascar".QUATERNARY SCIENCE REVIEWS 268(2021):9.