Changes in intermediate circulation in the Bay of Bengal since the Last Glacial Maximum as inferred from benthic foraminifera assemblages and geochemical proxies
International audience Benthic foraminiferal assemblages and geochemical tracers (δ18O, δ13C and 14C) 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...
Published in: | Geochemistry, Geophysics, Geosystems |
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Main Authors: | , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2019
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Subjects: | |
Online Access: | https://hal.science/hal-02092589 https://hal.science/hal-02092589/document https://hal.science/hal-02092589/file/2018GC008179.pdf https://doi.org/10.1029/2018GC008179 |
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Archives ouvertes de Paris-Saclay |
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language |
English |
topic |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Ma, Ruifang Sepulcre, Sophie Bassinot, Franck Licari, Laetitia 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 |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Benthic foraminiferal assemblages and geochemical tracers (δ18O, δ13C and 14C) 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 δ13C 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 δ13C and B‐P 14C 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 δ13C and the ɛNd values coincident with low B‐P 14C 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. |
author2 |
Géosciences Paris Sud (GEOPS) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Paléocéanographie (PALEOCEAN) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Tongji University Géochrononologie Traceurs Archéométrie (GEOTRAC) Unité GEOGLOB Faculté des Sciences de Sfax (FSS) Université de Sfax - University of Sfax-Université de Sfax - University of Sfax Institute of Oceanology China |
format |
Article in Journal/Newspaper |
author |
Ma, Ruifang Sepulcre, Sophie Bassinot, Franck Licari, Laetitia Liu, Zhifei Tisnerat-Laborde, Nadine Kallel, Nejib Yu, Zhaojie Colin, Christophe |
author_facet |
Ma, Ruifang Sepulcre, Sophie Bassinot, Franck Licari, Laetitia 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 |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02092589 https://hal.science/hal-02092589/document https://hal.science/hal-02092589/file/2018GC008179.pdf https://doi.org/10.1029/2018GC008179 |
geographic |
Antarctic Southern Ocean Indian |
geographic_facet |
Antarctic Southern Ocean Indian |
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_source |
ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-02092589 Geochemistry, Geophysics, Geosystems, 2019, ⟨10.1029/2018GC008179⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2018GC008179 hal-02092589 https://hal.science/hal-02092589 https://hal.science/hal-02092589/document https://hal.science/hal-02092589/file/2018GC008179.pdf doi:10.1029/2018GC008179 |
op_rights |
info:eu-repo/semantics/OpenAccess |
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_ |
1802651396163502080 |
spelling |
ftuniparissaclay:oai:HAL:hal-02092589v1 2024-06-23T07:47:18+00:00 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 Bassinot, Franck Licari, Laetitia Liu, Zhifei Tisnerat-Laborde, Nadine Kallel, Nejib Yu, Zhaojie Colin, Christophe Géosciences Paris Sud (GEOPS) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Paléocéanographie (PALEOCEAN) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Tongji University Géochrononologie Traceurs Archéométrie (GEOTRAC) Unité GEOGLOB Faculté des Sciences de Sfax (FSS) Université de Sfax - University of Sfax-Université de Sfax - University of Sfax Institute of Oceanology China 2019-03-05 https://hal.science/hal-02092589 https://hal.science/hal-02092589/document https://hal.science/hal-02092589/file/2018GC008179.pdf https://doi.org/10.1029/2018GC008179 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1029/2018GC008179 hal-02092589 https://hal.science/hal-02092589 https://hal.science/hal-02092589/document https://hal.science/hal-02092589/file/2018GC008179.pdf doi:10.1029/2018GC008179 info:eu-repo/semantics/OpenAccess ISSN: 1525-2027 EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-02092589 Geochemistry, Geophysics, Geosystems, 2019, ⟨10.1029/2018GC008179⟩ [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2019 ftuniparissaclay https://doi.org/10.1029/2018GC008179 2024-06-13T23:44:21Z International audience Benthic foraminiferal assemblages and geochemical tracers (δ18O, δ13C and 14C) 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 δ13C 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 δ13C and B‐P 14C 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 δ13C and the ɛNd values coincident with low B‐P 14C 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. Article in Journal/Newspaper Antarc* Antarctic North Atlantic Deep Water North Atlantic Planktonic foraminifera Southern Ocean Archives ouvertes de Paris-Saclay Antarctic Southern Ocean Indian Geochemistry, Geophysics, Geosystems 20 3 1592 1608 |