Changes in Intermediate Circulation in the Bay of Bengal Since the Last Glacial Maximum as Inferred From Benthic Foraminifera Assemblages and Geochemical Proxies
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 Oc...
Published in: | Geochemistry, Geophysics, Geosystems |
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Language: | English |
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AMER GEOPHYSICAL UNION
2019
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Online Access: | http://ir.qdio.ac.cn/handle/337002/161058 https://doi.org/10.1029/2018GC008179 |
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ftchinacasciocas:oai:ir.qdio.ac.cn:337002/161058 2023-05-15T14:03:36+02:00 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 Sepulcre, Sophie Licari, Laetitia Bassinot, Franck Liu, Zhifei Tisnerat-Laborde, Nadine Kallel, Nejib Yu, Zhaojie Colin, Christophe 2019-03-01 http://ir.qdio.ac.cn/handle/337002/161058 https://doi.org/10.1029/2018GC008179 英语 eng AMER GEOPHYSICAL UNION GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS http://ir.qdio.ac.cn/handle/337002/161058 doi:10.1029/2018GC008179 Bay of Bengal intermediate water masses glacial Holocene benthic foraminiferal assemblages carbon and oxygen stable isotopes B-P C-14 age Geochemistry & Geophysics MERIDIONAL OVERTURNING CIRCULATION NORTHEAST INDIAN-OCEAN DEEP-WATER ATMOSPHERIC CO2 SOUTHERN-OCEAN ISOTOPE COMPOSITION ATLANTIC CLIMATE OXYGEN ISOTOPES ORGANIC-CARBON SEA 期刊论文 2019 ftchinacasciocas https://doi.org/10.1029/2018GC008179 2022-06-27T05:40:38Z 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. Report Antarc* Antarctic North Atlantic Deep Water North Atlantic Planktonic foraminifera Southern Ocean Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR Antarctic Indian Southern Ocean Geochemistry, Geophysics, Geosystems 20 3 1592 1608 |
institution |
Open Polar |
collection |
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR |
op_collection_id |
ftchinacasciocas |
language |
English |
topic |
Bay of Bengal intermediate water masses glacial Holocene benthic foraminiferal assemblages carbon and oxygen stable isotopes B-P C-14 age Geochemistry & Geophysics MERIDIONAL OVERTURNING CIRCULATION NORTHEAST INDIAN-OCEAN DEEP-WATER ATMOSPHERIC CO2 SOUTHERN-OCEAN ISOTOPE COMPOSITION ATLANTIC CLIMATE OXYGEN ISOTOPES ORGANIC-CARBON SEA |
spellingShingle |
Bay of Bengal intermediate water masses glacial Holocene benthic foraminiferal assemblages carbon and oxygen stable isotopes B-P C-14 age Geochemistry & Geophysics MERIDIONAL OVERTURNING CIRCULATION NORTHEAST INDIAN-OCEAN DEEP-WATER ATMOSPHERIC CO2 SOUTHERN-OCEAN ISOTOPE COMPOSITION ATLANTIC CLIMATE OXYGEN ISOTOPES ORGANIC-CARBON SEA Ma, Ruifang Sepulcre, Sophie Licari, Laetitia Bassinot, Franck Liu, Zhifei Tisnerat-Laborde, Nadine Kallel, Nejib Yu, Zhaojie Colin, Christophe Changes in Intermediate Circulation in the Bay of Bengal Since the Last Glacial Maximum as Inferred From Benthic Foraminifera Assemblages and Geochemical Proxies |
topic_facet |
Bay of Bengal intermediate water masses glacial Holocene benthic foraminiferal assemblages carbon and oxygen stable isotopes B-P C-14 age Geochemistry & Geophysics MERIDIONAL OVERTURNING CIRCULATION NORTHEAST INDIAN-OCEAN DEEP-WATER ATMOSPHERIC CO2 SOUTHERN-OCEAN ISOTOPE COMPOSITION ATLANTIC CLIMATE OXYGEN ISOTOPES ORGANIC-CARBON SEA |
description |
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. |
format |
Report |
author |
Ma, Ruifang Sepulcre, Sophie Licari, Laetitia Bassinot, Franck Liu, Zhifei Tisnerat-Laborde, Nadine Kallel, Nejib Yu, Zhaojie Colin, Christophe |
author_facet |
Ma, Ruifang Sepulcre, Sophie Licari, Laetitia Bassinot, Franck Liu, Zhifei Tisnerat-Laborde, Nadine Kallel, Nejib Yu, Zhaojie Colin, Christophe |
author_sort |
Ma, Ruifang |
title |
Changes in Intermediate Circulation in the Bay of Bengal Since the Last Glacial Maximum as Inferred From Benthic Foraminifera Assemblages and Geochemical Proxies |
title_short |
Changes in Intermediate Circulation in the Bay of Bengal Since the Last Glacial Maximum as Inferred From Benthic Foraminifera Assemblages and Geochemical Proxies |
title_full |
Changes in Intermediate Circulation in the Bay of Bengal Since the Last Glacial Maximum as Inferred From Benthic Foraminifera Assemblages and Geochemical Proxies |
title_fullStr |
Changes in Intermediate Circulation in the Bay of Bengal Since the Last Glacial Maximum as Inferred From Benthic Foraminifera Assemblages and Geochemical Proxies |
title_full_unstemmed |
Changes in Intermediate Circulation in the Bay of Bengal Since the Last Glacial Maximum as Inferred From Benthic Foraminifera Assemblages and Geochemical Proxies |
title_sort |
changes in intermediate circulation in the bay of bengal since the last glacial maximum as inferred from benthic foraminifera assemblages and geochemical proxies |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2019 |
url |
http://ir.qdio.ac.cn/handle/337002/161058 https://doi.org/10.1029/2018GC008179 |
geographic |
Antarctic Indian Southern Ocean |
geographic_facet |
Antarctic Indian Southern Ocean |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Planktonic foraminifera Southern Ocean |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Planktonic foraminifera Southern Ocean |
op_relation |
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS http://ir.qdio.ac.cn/handle/337002/161058 doi:10.1029/2018GC008179 |
op_doi |
https://doi.org/10.1029/2018GC008179 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
20 |
container_issue |
3 |
container_start_page |
1592 |
op_container_end_page |
1608 |
_version_ |
1766274315401035776 |