Glacial‐Interglacial Circulation and Climatic Changes in the South Indian Ocean (Kerguelen Plateau Region) Recorded by Detrital and Biogenic Magnetic Minerals
The Southern Ocean (SO) plays a fundamental role in global climate due to the presence of the intense eastward‐flowing Antarctic Circumpolar Current (ACC), one of the most important ocean current systems. The configuration of the frontal systems of the ACC is controlled by the orbital‐ and millennia...
Published in: | Journal of Geophysical Research: Solid Earth |
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Language: | English |
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American Geophysical Union (AGU)
2023
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Online Access: | https://archimer.ifremer.fr/doc/00861/97317/106318.pdf https://archimer.ifremer.fr/doc/00861/97317/106319.pdf https://doi.org/10.1029/2023JB027741 https://archimer.ifremer.fr/doc/00861/97317/ |
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ftarchimer:oai:archimer.ifremer.fr:97317 2024-06-23T07:47:53+00:00 Glacial‐Interglacial Circulation and Climatic Changes in the South Indian Ocean (Kerguelen Plateau Region) Recorded by Detrital and Biogenic Magnetic Minerals Liu, Yan Kissel, Catherine Mazaud, Alain Pan, Yongxin Li, Jinhua 2023-11 application/pdf https://archimer.ifremer.fr/doc/00861/97317/106318.pdf https://archimer.ifremer.fr/doc/00861/97317/106319.pdf https://doi.org/10.1029/2023JB027741 https://archimer.ifremer.fr/doc/00861/97317/ eng eng American Geophysical Union (AGU) https://archimer.ifremer.fr/doc/00861/97317/106318.pdf https://archimer.ifremer.fr/doc/00861/97317/106319.pdf doi:10.1029/2023JB027741 https://archimer.ifremer.fr/doc/00861/97317/ info:eu-repo/semantics/openAccess restricted use Journal Of Geophysical Research-solid Earth (2169-9313) (American Geophysical Union (AGU)), 2023-11 , Vol. 128 , N. 11 , P. e2023JB027741 (20p.) Southern Hemisphere westerly wind Antarctic Circumpolar Current Southern Ocean upwelling core MD11-3353 detrital titanomagnetites magnetofossils text Article info:eu-repo/semantics/article 2023 ftarchimer https://doi.org/10.1029/2023JB027741 2024-05-29T00:00:22Z The Southern Ocean (SO) plays a fundamental role in global climate due to the presence of the intense eastward‐flowing Antarctic Circumpolar Current (ACC), one of the most important ocean current systems. The configuration of the frontal systems of the ACC is controlled by the orbital‐ and millennial‐scale variations of the Southern Hemisphere westerly winds (SHWW) and the SO upwelling. However, the reconstruction of paleoclimate and paleocurrent in the SO remains controversial possibly because of the complex interpretation of paleo‐proxies and the regional variations. Here, we present results from rock magnetic measurements and electron microscopic analyses on marine core MD11‐3353 over the past 150 Kyr, which is located in the Polar Front Zone, west of the Kerguelen Plateau. Our data sets indicate that magnetic mineral assemblages in the core are dominated by detrital magnetic minerals mixed with biogenic magnetic minerals (i.e., magnetofossils formed by magnetotactic bacteria) during the interglacial periods. Changes in the detrital magnetic mineral content indicate a strong modulation of the ACC intensity and the SHWW stress at the orbital scale over the last climatic cycle with an enhanced activity during the glacial periods. The increase in magnetofossils content during the interglacial periods indicates an enhanced nutrient supply from the SO upwelling resulting from the southward migration of the Antarctic Polar Front. Our results suggest that the variations of concentration and assemblage of magnetic minerals can be used as faithful proxies for reconstructing ocean circulation and upwelling changes in the South Indian Ocean over the past 150 Kyr. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Indian Kerguelen Southern Ocean The Antarctic Journal of Geophysical Research: Solid Earth 128 11 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Southern Hemisphere westerly wind Antarctic Circumpolar Current Southern Ocean upwelling core MD11-3353 detrital titanomagnetites magnetofossils |
spellingShingle |
Southern Hemisphere westerly wind Antarctic Circumpolar Current Southern Ocean upwelling core MD11-3353 detrital titanomagnetites magnetofossils Liu, Yan Kissel, Catherine Mazaud, Alain Pan, Yongxin Li, Jinhua Glacial‐Interglacial Circulation and Climatic Changes in the South Indian Ocean (Kerguelen Plateau Region) Recorded by Detrital and Biogenic Magnetic Minerals |
topic_facet |
Southern Hemisphere westerly wind Antarctic Circumpolar Current Southern Ocean upwelling core MD11-3353 detrital titanomagnetites magnetofossils |
description |
The Southern Ocean (SO) plays a fundamental role in global climate due to the presence of the intense eastward‐flowing Antarctic Circumpolar Current (ACC), one of the most important ocean current systems. The configuration of the frontal systems of the ACC is controlled by the orbital‐ and millennial‐scale variations of the Southern Hemisphere westerly winds (SHWW) and the SO upwelling. However, the reconstruction of paleoclimate and paleocurrent in the SO remains controversial possibly because of the complex interpretation of paleo‐proxies and the regional variations. Here, we present results from rock magnetic measurements and electron microscopic analyses on marine core MD11‐3353 over the past 150 Kyr, which is located in the Polar Front Zone, west of the Kerguelen Plateau. Our data sets indicate that magnetic mineral assemblages in the core are dominated by detrital magnetic minerals mixed with biogenic magnetic minerals (i.e., magnetofossils formed by magnetotactic bacteria) during the interglacial periods. Changes in the detrital magnetic mineral content indicate a strong modulation of the ACC intensity and the SHWW stress at the orbital scale over the last climatic cycle with an enhanced activity during the glacial periods. The increase in magnetofossils content during the interglacial periods indicates an enhanced nutrient supply from the SO upwelling resulting from the southward migration of the Antarctic Polar Front. Our results suggest that the variations of concentration and assemblage of magnetic minerals can be used as faithful proxies for reconstructing ocean circulation and upwelling changes in the South Indian Ocean over the past 150 Kyr. |
format |
Article in Journal/Newspaper |
author |
Liu, Yan Kissel, Catherine Mazaud, Alain Pan, Yongxin Li, Jinhua |
author_facet |
Liu, Yan Kissel, Catherine Mazaud, Alain Pan, Yongxin Li, Jinhua |
author_sort |
Liu, Yan |
title |
Glacial‐Interglacial Circulation and Climatic Changes in the South Indian Ocean (Kerguelen Plateau Region) Recorded by Detrital and Biogenic Magnetic Minerals |
title_short |
Glacial‐Interglacial Circulation and Climatic Changes in the South Indian Ocean (Kerguelen Plateau Region) Recorded by Detrital and Biogenic Magnetic Minerals |
title_full |
Glacial‐Interglacial Circulation and Climatic Changes in the South Indian Ocean (Kerguelen Plateau Region) Recorded by Detrital and Biogenic Magnetic Minerals |
title_fullStr |
Glacial‐Interglacial Circulation and Climatic Changes in the South Indian Ocean (Kerguelen Plateau Region) Recorded by Detrital and Biogenic Magnetic Minerals |
title_full_unstemmed |
Glacial‐Interglacial Circulation and Climatic Changes in the South Indian Ocean (Kerguelen Plateau Region) Recorded by Detrital and Biogenic Magnetic Minerals |
title_sort |
glacial‐interglacial circulation and climatic changes in the south indian ocean (kerguelen plateau region) recorded by detrital and biogenic magnetic minerals |
publisher |
American Geophysical Union (AGU) |
publishDate |
2023 |
url |
https://archimer.ifremer.fr/doc/00861/97317/106318.pdf https://archimer.ifremer.fr/doc/00861/97317/106319.pdf https://doi.org/10.1029/2023JB027741 https://archimer.ifremer.fr/doc/00861/97317/ |
geographic |
Antarctic Indian Kerguelen Southern Ocean The Antarctic |
geographic_facet |
Antarctic Indian Kerguelen Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Journal Of Geophysical Research-solid Earth (2169-9313) (American Geophysical Union (AGU)), 2023-11 , Vol. 128 , N. 11 , P. e2023JB027741 (20p.) |
op_relation |
https://archimer.ifremer.fr/doc/00861/97317/106318.pdf https://archimer.ifremer.fr/doc/00861/97317/106319.pdf doi:10.1029/2023JB027741 https://archimer.ifremer.fr/doc/00861/97317/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2023JB027741 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
128 |
container_issue |
11 |
_version_ |
1802638101332361216 |