IOCAS-IR  > 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, Ruifang1; Sepulcre, Sophie1; Licari, Laetitia2; Bassinot, Franck3; Liu, Zhifei4; Tisnerat-Laborde, Nadine3; Kallel, Nejib5; Yu, Zhaojie6; Colin, Christophe1
2019-03-01
Source PublicationGEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
ISSN1525-2027
Volume20Issue:3Pages:1592-1608
Corresponding AuthorMa, Ruifang(rui-fang.ma@u-psud.fr)
AbstractBenthic 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.
KeywordBay of Bengal intermediate water masses glacial Holocene benthic foraminiferal assemblages carbon and oxygen stable isotopes B-P C-14 age
DOI10.1029/2018GC008179
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41806060] ; China Scholarship Council ; INSU-LEFE-IMAGO-CITRON GLACE program
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000464647100018
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/161060
Collection海洋地质与环境重点实验室
Corresponding AuthorMa, Ruifang
Affiliation1.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
Recommended Citation
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.
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