North Atlantic mid-latitude surface-circulation changes through the Plio-Pleistocene intensification of northern hemisphere glaciation
International audience The North Atlantic Current (NAC) transports warm salty water to high northern latitudes, with important repercussions for ocean circulation and global climate. A southward displacement of the NAC and Subarctic Front, which separate subpolar and subtropical water masses, is wid...
Published in: | Paleoceanography and Paleoclimatology |
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Main Authors: | , , , , , , , , , , , , , |
Other Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2018
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Online Access: | https://hal.science/hal-01884463 https://hal.science/hal-01884463/document https://hal.science/hal-01884463/file/Bolton_et_al-2018-Paleoceanography_and_Paleoclimatology.pdf https://doi.org/10.1029/2018PA003412 |
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ftunivaixmarseil:oai:HAL:hal-01884463v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Aix-Marseille Université: HAL |
op_collection_id |
ftunivaixmarseil |
language |
English |
topic |
water ocean sea-level ice sheets climate variability temperature variability planktonic-foraminifera late pliocene cold-core eddy oxygen isotopc composition [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
water ocean sea-level ice sheets climate variability temperature variability planktonic-foraminifera late pliocene cold-core eddy oxygen isotopc composition [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology Bolton, Clara Bailey, Ian Friedrich, Oliver Tachikawa, K. de Garidel-Thoron, Thibault Vidal, Laurence Sonzogni, Corinne Marino, Gianluca Rohling, Eelco, J. Robinson, Marci Ermini, Magali Koch, Mirjam Cooper, Matthew, J Wilson, Paul, A North Atlantic mid-latitude surface-circulation changes through the Plio-Pleistocene intensification of northern hemisphere glaciation |
topic_facet |
water ocean sea-level ice sheets climate variability temperature variability planktonic-foraminifera late pliocene cold-core eddy oxygen isotopc composition [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience The North Atlantic Current (NAC) transports warm salty water to high northern latitudes, with important repercussions for ocean circulation and global climate. A southward displacement of the NAC and Subarctic Front, which separate subpolar and subtropical water masses, is widely suggested for the Last Glacial Maximum (LGM) and may have acted as a positive feedback in glacial expansion at this time. However, the role of the NAC during the intensification of Northern Hemisphere glaciation (iNHG) at ~3.5 to 2.5 Ma is less clear. Here we present new records from Integrated Ocean Drilling Program Site U1313 (41°N) spanning ~2.8-2.4 Ma to trace the influence of Subarctic Front waters above this mid-latitude site. We reconstruct surface and permanent pycnocline temperatures and seawater δ 18 O using paired Mg/Ca-δ 18 O measurements on the planktic foraminifers Globigerinoides ruber and Globorotalia crassaformis and determine abundances of the subpolar foraminifer Neogloboquadrina atlantica. We find that the first significant glacial incursions of Subarctic Front surface waters above Site U1313 did not occur until ~2.6 Ma. At no time during our study interval was (sub)surface reorganization in the midlatitude North Atlantic analogous to the LGM. Our findings suggest that LGM-like processes sensu stricto cannot be invoked to explain interglacial-glacial cycle amplification during iNHG. They also imply that increased glacial productivity at Site U1313 during iNHG was not only driven by southward deflections of the Subarctic Front. We suggest that nutrient injection from cold-core eddies and enhanced glacial dust delivery may have played additional roles in increasing export productivity in the midlatitude North Atlantic from 2.7 Ma. |
author2 |
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) National Oceanography Centre Southampton (NOC) University of Southampton University of Vigo Pontevedra Australian National University (ANU) United States Geological Survey Reston (USGS) Goethe-Universität Frankfurt am Main Dalhousie University Halifax |
format |
Article in Journal/Newspaper |
author |
Bolton, Clara Bailey, Ian Friedrich, Oliver Tachikawa, K. de Garidel-Thoron, Thibault Vidal, Laurence Sonzogni, Corinne Marino, Gianluca Rohling, Eelco, J. Robinson, Marci Ermini, Magali Koch, Mirjam Cooper, Matthew, J Wilson, Paul, A |
author_facet |
Bolton, Clara Bailey, Ian Friedrich, Oliver Tachikawa, K. de Garidel-Thoron, Thibault Vidal, Laurence Sonzogni, Corinne Marino, Gianluca Rohling, Eelco, J. Robinson, Marci Ermini, Magali Koch, Mirjam Cooper, Matthew, J Wilson, Paul, A |
author_sort |
Bolton, Clara |
title |
North Atlantic mid-latitude surface-circulation changes through the Plio-Pleistocene intensification of northern hemisphere glaciation |
title_short |
North Atlantic mid-latitude surface-circulation changes through the Plio-Pleistocene intensification of northern hemisphere glaciation |
title_full |
North Atlantic mid-latitude surface-circulation changes through the Plio-Pleistocene intensification of northern hemisphere glaciation |
title_fullStr |
North Atlantic mid-latitude surface-circulation changes through the Plio-Pleistocene intensification of northern hemisphere glaciation |
title_full_unstemmed |
North Atlantic mid-latitude surface-circulation changes through the Plio-Pleistocene intensification of northern hemisphere glaciation |
title_sort |
north atlantic mid-latitude surface-circulation changes through the plio-pleistocene intensification of northern hemisphere glaciation |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-01884463 https://hal.science/hal-01884463/document https://hal.science/hal-01884463/file/Bolton_et_al-2018-Paleoceanography_and_Paleoclimatology.pdf https://doi.org/10.1029/2018PA003412 |
genre |
north atlantic current North Atlantic Planktonic foraminifera Subarctic |
genre_facet |
north atlantic current North Atlantic Planktonic foraminifera Subarctic |
op_source |
ISSN: 0883-8305 Paleoceanography https://hal.science/hal-01884463 Paleoceanography, 2018, 33 (11), pp.1186-1205. ⟨10.1029/2018PA003412⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2018PA003412 hal-01884463 https://hal.science/hal-01884463 https://hal.science/hal-01884463/document https://hal.science/hal-01884463/file/Bolton_et_al-2018-Paleoceanography_and_Paleoclimatology.pdf doi:10.1029/2018PA003412 PRODINRA: 468113 WOS: 000452730000004 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2018PA003412 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
33 |
container_issue |
11 |
container_start_page |
1186 |
op_container_end_page |
1205 |
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1785569312987152384 |
spelling |
ftunivaixmarseil:oai:HAL:hal-01884463v1 2023-12-17T10:45:59+01:00 North Atlantic mid-latitude surface-circulation changes through the Plio-Pleistocene intensification of northern hemisphere glaciation Bolton, Clara Bailey, Ian Friedrich, Oliver Tachikawa, K. de Garidel-Thoron, Thibault Vidal, Laurence Sonzogni, Corinne Marino, Gianluca Rohling, Eelco, J. Robinson, Marci Ermini, Magali Koch, Mirjam Cooper, Matthew, J Wilson, Paul, A 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) National Oceanography Centre Southampton (NOC) University of Southampton University of Vigo Pontevedra Australian National University (ANU) United States Geological Survey Reston (USGS) Goethe-Universität Frankfurt am Main Dalhousie University Halifax 2018 https://hal.science/hal-01884463 https://hal.science/hal-01884463/document https://hal.science/hal-01884463/file/Bolton_et_al-2018-Paleoceanography_and_Paleoclimatology.pdf https://doi.org/10.1029/2018PA003412 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2018PA003412 hal-01884463 https://hal.science/hal-01884463 https://hal.science/hal-01884463/document https://hal.science/hal-01884463/file/Bolton_et_al-2018-Paleoceanography_and_Paleoclimatology.pdf doi:10.1029/2018PA003412 PRODINRA: 468113 WOS: 000452730000004 info:eu-repo/semantics/OpenAccess ISSN: 0883-8305 Paleoceanography https://hal.science/hal-01884463 Paleoceanography, 2018, 33 (11), pp.1186-1205. ⟨10.1029/2018PA003412⟩ water ocean sea-level ice sheets climate variability temperature variability planktonic-foraminifera late pliocene cold-core eddy oxygen isotopc composition [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2018 ftunivaixmarseil https://doi.org/10.1029/2018PA003412 2023-11-21T23:47:25Z International audience The North Atlantic Current (NAC) transports warm salty water to high northern latitudes, with important repercussions for ocean circulation and global climate. A southward displacement of the NAC and Subarctic Front, which separate subpolar and subtropical water masses, is widely suggested for the Last Glacial Maximum (LGM) and may have acted as a positive feedback in glacial expansion at this time. However, the role of the NAC during the intensification of Northern Hemisphere glaciation (iNHG) at ~3.5 to 2.5 Ma is less clear. Here we present new records from Integrated Ocean Drilling Program Site U1313 (41°N) spanning ~2.8-2.4 Ma to trace the influence of Subarctic Front waters above this mid-latitude site. We reconstruct surface and permanent pycnocline temperatures and seawater δ 18 O using paired Mg/Ca-δ 18 O measurements on the planktic foraminifers Globigerinoides ruber and Globorotalia crassaformis and determine abundances of the subpolar foraminifer Neogloboquadrina atlantica. We find that the first significant glacial incursions of Subarctic Front surface waters above Site U1313 did not occur until ~2.6 Ma. At no time during our study interval was (sub)surface reorganization in the midlatitude North Atlantic analogous to the LGM. Our findings suggest that LGM-like processes sensu stricto cannot be invoked to explain interglacial-glacial cycle amplification during iNHG. They also imply that increased glacial productivity at Site U1313 during iNHG was not only driven by southward deflections of the Subarctic Front. We suggest that nutrient injection from cold-core eddies and enhanced glacial dust delivery may have played additional roles in increasing export productivity in the midlatitude North Atlantic from 2.7 Ma. Article in Journal/Newspaper north atlantic current North Atlantic Planktonic foraminifera Subarctic Aix-Marseille Université: HAL Paleoceanography and Paleoclimatology 33 11 1186 1205 |