Changes in Intermediate Circulation in the Bay of Bengal Since the Last Glacial Maximum as Inferred From Benthic Foraminifera Assemblages and Geochemical Proxies

doi:10.1029/2018GC008179

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Changes in Intermediate Circulation in the Bay of Bengal Since the Last Glacial Maximum as Inferred From Benthic Foraminifera Assemblages and Geochemical Proxies
	Ma, Ruifang 1; Sepulcre, Sophie 1; Licari, Laetitia 2; Bassinot, Franck 3; Liu, Zhifei 4; Tisnerat-Laborde, Nadine 3; Kallel, Nejib 5; Yu, Zhaojie 6; Colin, Christophe 1
刊名	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
	2019-03-01
卷号	20 期号:3 页码:1592-1608
关键词	Bay of Bengal intermediate water masses glacial Holocene benthic foraminiferal assemblages carbon and oxygen stable isotopes B-P C-14 age
ISSN号	1525-2027
DOI	10.1029/2018GC008179
通讯作者	Ma, Ruifang(rui-fang.ma@u-psud.fr)
英文摘要	Benthic foraminiferal assemblages and geochemical tracers (delta O-18, delta C-13 and C-14) have been analyzed on benthic and planktonic foraminifera from core MD77-176, located in the northern Bay of Bengal, in order to reconstruct the evolution of intermediate circulation in the northern Indian Ocean since the last glaciation. Results indicate that during the Last Glacial Maximum (LGM), Southern Sourced Water masses were dominant at the core site. A high relative abundance of intermediate and deep infaunal species during the LGM reflects low oxygen concentration and/or mesotropic to eutrophic deep water conditions, associated with depleted benthic delta C-13 values. During the Holocene, benthic foraminiferal assemblages indicate an oligotropic to mesotrophic environment with well-ventilated bottom water conditions compared with LGM. Higher values for benthic foraminifera delta C-13 and B-P C-14 age offsets suggest an increased contribution of North Atlantic Deep Water to the northern Bay of Bengal during the Late Holocene compared to the LGM. Millennial-scale events punctuated the last deglaciation, with a shift in the delta C-13 and the epsilon(Nd) values coincident with low B-P C-14 age offsets, providing strong evidence for an increased contribution of Antarctic Intermediate Water at the studied site. This was associated with enhanced upwelling in the Southern Ocean, reflecting a strong sea-atmospheric CO2 exchange through Southern Ocean ventilation during the last deglaciation.
资助项目	National Natural Science Foundation of China[41806060] ; China Scholarship Council ; INSU-LEFE-IMAGO-CITRON GLACE program
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000464647100018
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/161059]
专题	海洋研究所_海洋地质与环境重点实验室
通讯作者	Ma, Ruifang
作者单位	1.Univ Paris Saclay, Univ Paris Sud, CNRS, GEOPS, Orsay, France 2.Aix Marseille Univ, Europole Arbois, CEREGE, BP80, Aix En Provence, France 3.CNRS, CEA, UVSQ, LSCE,IPSL,UMR 8212, Gif Sur Yvette, France 4.Tongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China 5.Univ Sfax, Fac Sci Sfax, Lab Georessources Mat Environnem & Changements Gl, LR13ES23, Sfax, Tunisia 6.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Ma, Ruifang,Sepulcre, Sophie,Licari, Laetitia,et al. Changes in Intermediate Circulation in the Bay of Bengal Since the Last Glacial Maximum as Inferred From Benthic Foraminifera Assemblages and Geochemical Proxies[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2019,20(3):1592-1608.
APA	Ma, Ruifang.,Sepulcre, Sophie.,Licari, Laetitia.,Bassinot, Franck.,Liu, Zhifei.,...&Colin, Christophe.(2019).Changes in Intermediate Circulation in the Bay of Bengal Since the Last Glacial Maximum as Inferred From Benthic Foraminifera Assemblages and Geochemical Proxies.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,20(3),1592-1608.
MLA	Ma, Ruifang,et al."Changes in Intermediate Circulation in the Bay of Bengal Since the Last Glacial Maximum as Inferred From Benthic Foraminifera Assemblages and Geochemical Proxies".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 20.3(2019):1592-1608.