Absence of a strong, deep-reaching Antarctic Circumpolar Current zonal flow across the Tasmanian gateway during the Oligocene to early Miocene
International audience The vigorous eastward flow of the Antarctic Circumpolar Current (ACC) connects all major ocean basins and plays a prominent role in the transport of heat, carbon and nutrients around the globe. However, the establishment of a deep circumpolar flow, similar to the present-day A...
Published in: | Global and Planetary Change |
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Main Authors: | , , , , , , , , , , , , , |
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2022
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Subjects: | |
Online Access: | https://insu.hal.science/insu-03678661 https://insu.hal.science/insu-03678661/document https://insu.hal.science/insu-03678661/file/S0921818121003039.pdf https://doi.org/10.1016/j.gloplacha.2021.103718 |
id |
ftinsu:oai:HAL:insu-03678661v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
ACC CDW Neodymium isotope ratios Deep ocean circulation Tasmanian Gateway Oligocene-early Miocene [SDU]Sciences of the Universe [physics] |
spellingShingle |
ACC CDW Neodymium isotope ratios Deep ocean circulation Tasmanian Gateway Oligocene-early Miocene [SDU]Sciences of the Universe [physics] Evangelinos, Dimitris Escutia, Carlota van de Flierdt, Tina Valero, Luis Flores, José-Abel Harwood, David M. Hoem, Frida S. Bijl, Peter Etourneau, Johan Kreissig, Katharina Nilsson-Kerr, Katrina Holder, Liam López-Quirós, Adrián Salabarnada, Ariadna Absence of a strong, deep-reaching Antarctic Circumpolar Current zonal flow across the Tasmanian gateway during the Oligocene to early Miocene |
topic_facet |
ACC CDW Neodymium isotope ratios Deep ocean circulation Tasmanian Gateway Oligocene-early Miocene [SDU]Sciences of the Universe [physics] |
description |
International audience The vigorous eastward flow of the Antarctic Circumpolar Current (ACC) connects all major ocean basins and plays a prominent role in the transport of heat, carbon and nutrients around the globe. However, the establishment of a deep circumpolar flow, similar to the present-day ACC, remains controversial thereby obscuring our understanding of its climatic impact. Deciphering the chemical composition of Circumpolar Deep Water (CDW) within the ACC can provide critical insights about its development and evolution. Here we present new fossil fish teeth/bone debris neodymium isotope (ε Nd ) records from Deep Sea Drilling Project (DSDP) Sites 278 and 274 in the southwest Pacific Ocean, with the aim to trace changes in deep water masses across the Tasmanian Gateway between the early Oligocene and early Miocene (~ 33-22 Ma). Site 274 provides the first Nd isotope record proximal to the Ross Sea during the Oligocene (33.5-23.4 Ma). Its Nd isotope composition shows excursions to very radiogenic values, ε Nd(t) = -3.1 and ε Nd(t)= - 3.7, at 33.5 Ma and 23.8 Ma, respectively, in response to major steps in Antarctic ice sheet expansion. A shift to lower, more unradiogenic ε Nd(t) values between 29.7 and 29.1 Ma is linked to an increased influence of proto-CDW upwelling at the site. In contrast, the Nd isotope record from Site 278 in the southern Emerald Basin shows little variability (ε Nd(t) = -6.0 to -6.7) throughout the Oligocene and early Miocene (30.9-21.8 Ma). Comparison with published data north of the ACC path, demonstrates the presence of two deep water masses in the South Pacific prior to the inferred onset of the ACC (33-30 Ma), one occupying depths between ~2500 and 3000 m (ε Nd(t)= ~ -3 to -5) and a deep/bottom water mass (> 3000 m) with a more unradiogenic Nd isotope composition (ε Nd(t)= ~ -6). Site 278 located close to the proto-polar front (proto-PF) indicates that following the inferred onset of the ACC, deep waters bathing the southern Emerald Basin remained more radiogenic in the ... |
author2 |
Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Evangelinos, Dimitris Escutia, Carlota van de Flierdt, Tina Valero, Luis Flores, José-Abel Harwood, David M. Hoem, Frida S. Bijl, Peter Etourneau, Johan Kreissig, Katharina Nilsson-Kerr, Katrina Holder, Liam López-Quirós, Adrián Salabarnada, Ariadna |
author_facet |
Evangelinos, Dimitris Escutia, Carlota van de Flierdt, Tina Valero, Luis Flores, José-Abel Harwood, David M. Hoem, Frida S. Bijl, Peter Etourneau, Johan Kreissig, Katharina Nilsson-Kerr, Katrina Holder, Liam López-Quirós, Adrián Salabarnada, Ariadna |
author_sort |
Evangelinos, Dimitris |
title |
Absence of a strong, deep-reaching Antarctic Circumpolar Current zonal flow across the Tasmanian gateway during the Oligocene to early Miocene |
title_short |
Absence of a strong, deep-reaching Antarctic Circumpolar Current zonal flow across the Tasmanian gateway during the Oligocene to early Miocene |
title_full |
Absence of a strong, deep-reaching Antarctic Circumpolar Current zonal flow across the Tasmanian gateway during the Oligocene to early Miocene |
title_fullStr |
Absence of a strong, deep-reaching Antarctic Circumpolar Current zonal flow across the Tasmanian gateway during the Oligocene to early Miocene |
title_full_unstemmed |
Absence of a strong, deep-reaching Antarctic Circumpolar Current zonal flow across the Tasmanian gateway during the Oligocene to early Miocene |
title_sort |
absence of a strong, deep-reaching antarctic circumpolar current zonal flow across the tasmanian gateway during the oligocene to early miocene |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://insu.hal.science/insu-03678661 https://insu.hal.science/insu-03678661/document https://insu.hal.science/insu-03678661/file/S0921818121003039.pdf https://doi.org/10.1016/j.gloplacha.2021.103718 |
long_lat |
ENVELOPE(162.500,162.500,-54.000,-54.000) |
geographic |
Antarctic Emerald Basin Pacific Ross Sea The Antarctic |
geographic_facet |
Antarctic Emerald Basin Pacific Ross Sea The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Ross Sea |
genre_facet |
Antarc* Antarctic Ice Sheet Ross Sea |
op_source |
Global and Planetary Change https://insu.hal.science/insu-03678661 Global and Planetary Change, 2022, 208, 317, p. 18-38. ⟨10.1016/j.gloplacha.2021.103718⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gloplacha.2021.103718 insu-03678661 https://insu.hal.science/insu-03678661 https://insu.hal.science/insu-03678661/document https://insu.hal.science/insu-03678661/file/S0921818121003039.pdf BIBCODE: 2022GPC.20803718E doi:10.1016/j.gloplacha.2021.103718 PII: S0921-8181(21)00303-9 |
op_rights |
http://creativecommons.org/licenses/by-nc/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.gloplacha.2021.103718 |
container_title |
Global and Planetary Change |
container_volume |
208 |
container_start_page |
103718 |
_version_ |
1789959321904218112 |
spelling |
ftinsu:oai:HAL:insu-03678661v1 2024-02-04T09:55:22+01:00 Absence of a strong, deep-reaching Antarctic Circumpolar Current zonal flow across the Tasmanian gateway during the Oligocene to early Miocene Evangelinos, Dimitris Escutia, Carlota van de Flierdt, Tina Valero, Luis Flores, José-Abel Harwood, David M. Hoem, Frida S. Bijl, Peter Etourneau, Johan Kreissig, Katharina Nilsson-Kerr, Katrina Holder, Liam López-Quirós, Adrián Salabarnada, Ariadna Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) 2022 https://insu.hal.science/insu-03678661 https://insu.hal.science/insu-03678661/document https://insu.hal.science/insu-03678661/file/S0921818121003039.pdf https://doi.org/10.1016/j.gloplacha.2021.103718 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gloplacha.2021.103718 insu-03678661 https://insu.hal.science/insu-03678661 https://insu.hal.science/insu-03678661/document https://insu.hal.science/insu-03678661/file/S0921818121003039.pdf BIBCODE: 2022GPC.20803718E doi:10.1016/j.gloplacha.2021.103718 PII: S0921-8181(21)00303-9 http://creativecommons.org/licenses/by-nc/ info:eu-repo/semantics/OpenAccess Global and Planetary Change https://insu.hal.science/insu-03678661 Global and Planetary Change, 2022, 208, 317, p. 18-38. ⟨10.1016/j.gloplacha.2021.103718⟩ ACC CDW Neodymium isotope ratios Deep ocean circulation Tasmanian Gateway Oligocene-early Miocene [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2022 ftinsu https://doi.org/10.1016/j.gloplacha.2021.103718 2024-01-10T17:23:14Z International audience The vigorous eastward flow of the Antarctic Circumpolar Current (ACC) connects all major ocean basins and plays a prominent role in the transport of heat, carbon and nutrients around the globe. However, the establishment of a deep circumpolar flow, similar to the present-day ACC, remains controversial thereby obscuring our understanding of its climatic impact. Deciphering the chemical composition of Circumpolar Deep Water (CDW) within the ACC can provide critical insights about its development and evolution. Here we present new fossil fish teeth/bone debris neodymium isotope (ε Nd ) records from Deep Sea Drilling Project (DSDP) Sites 278 and 274 in the southwest Pacific Ocean, with the aim to trace changes in deep water masses across the Tasmanian Gateway between the early Oligocene and early Miocene (~ 33-22 Ma). Site 274 provides the first Nd isotope record proximal to the Ross Sea during the Oligocene (33.5-23.4 Ma). Its Nd isotope composition shows excursions to very radiogenic values, ε Nd(t) = -3.1 and ε Nd(t)= - 3.7, at 33.5 Ma and 23.8 Ma, respectively, in response to major steps in Antarctic ice sheet expansion. A shift to lower, more unradiogenic ε Nd(t) values between 29.7 and 29.1 Ma is linked to an increased influence of proto-CDW upwelling at the site. In contrast, the Nd isotope record from Site 278 in the southern Emerald Basin shows little variability (ε Nd(t) = -6.0 to -6.7) throughout the Oligocene and early Miocene (30.9-21.8 Ma). Comparison with published data north of the ACC path, demonstrates the presence of two deep water masses in the South Pacific prior to the inferred onset of the ACC (33-30 Ma), one occupying depths between ~2500 and 3000 m (ε Nd(t)= ~ -3 to -5) and a deep/bottom water mass (> 3000 m) with a more unradiogenic Nd isotope composition (ε Nd(t)= ~ -6). Site 278 located close to the proto-polar front (proto-PF) indicates that following the inferred onset of the ACC, deep waters bathing the southern Emerald Basin remained more radiogenic in the ... Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Ross Sea Institut national des sciences de l'Univers: HAL-INSU Antarctic Emerald Basin ENVELOPE(162.500,162.500,-54.000,-54.000) Pacific Ross Sea The Antarctic Global and Planetary Change 208 103718 |