Absence of a strong, deep-reaching Antarctic Circumpolar Current zonal flow across the Tasmanian gateway during the Oligocene to early Miocene
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 controversi...
Published in: | Global and Planetary Change |
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Main Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2022
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Online Access: | https://pure.au.dk/portal/da/publications/absence-of-a-strong-deepreaching-antarctic-circumpolar-current-zonal-flow-across-the-tasmanian-gateway-during-the-oligocene-to-early-miocene(db98afae-11a5-4d7c-935f-3601cdf0724f).html https://doi.org/10.1016/j.gloplacha.2021.103718 http://www.scopus.com/inward/record.url?scp=85120803075&partnerID=8YFLogxK |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/db98afae-11a5-4d7c-935f-3601cdf0724f 2023-08-27T04:06:08+02:00 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 2022-01 https://pure.au.dk/portal/da/publications/absence-of-a-strong-deepreaching-antarctic-circumpolar-current-zonal-flow-across-the-tasmanian-gateway-during-the-oligocene-to-early-miocene(db98afae-11a5-4d7c-935f-3601cdf0724f).html https://doi.org/10.1016/j.gloplacha.2021.103718 http://www.scopus.com/inward/record.url?scp=85120803075&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Evangelinos , D , Escutia , C , van de Flierdt , T , Valero , L , Flores , J A , Harwood , D M , Hoem , F S , Bijl , P , Etourneau , J , Kreissig , K , Nilsson-Kerr , K , Holder , L , López-Quirós , A & Salabarnada , A 2022 , ' Absence of a strong, deep-reaching Antarctic Circumpolar Current zonal flow across the Tasmanian gateway during the Oligocene to early Miocene ' , Global and Planetary Change , vol. 208 , 103718 . https://doi.org/10.1016/j.gloplacha.2021.103718 ACC CDW Deep ocean circulation Neodymium isotope ratios Oligocene-early Miocene Tasmanian Gateway article 2022 ftuniaarhuspubl https://doi.org/10.1016/j.gloplacha.2021.103718 2023-08-02T22:58:08Z 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 Southwest Pacific ... Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Ross Sea Aarhus University: Research Antarctic The Antarctic Ross Sea Pacific Emerald Basin ENVELOPE(162.500,162.500,-54.000,-54.000) Global and Planetary Change 208 103718 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
ACC CDW Deep ocean circulation Neodymium isotope ratios Oligocene-early Miocene Tasmanian Gateway |
spellingShingle |
ACC CDW Deep ocean circulation Neodymium isotope ratios Oligocene-early Miocene Tasmanian Gateway 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 Deep ocean circulation Neodymium isotope ratios Oligocene-early Miocene Tasmanian Gateway |
description |
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 Southwest Pacific ... |
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 |
publishDate |
2022 |
url |
https://pure.au.dk/portal/da/publications/absence-of-a-strong-deepreaching-antarctic-circumpolar-current-zonal-flow-across-the-tasmanian-gateway-during-the-oligocene-to-early-miocene(db98afae-11a5-4d7c-935f-3601cdf0724f).html https://doi.org/10.1016/j.gloplacha.2021.103718 http://www.scopus.com/inward/record.url?scp=85120803075&partnerID=8YFLogxK |
long_lat |
ENVELOPE(162.500,162.500,-54.000,-54.000) |
geographic |
Antarctic The Antarctic Ross Sea Pacific Emerald Basin |
geographic_facet |
Antarctic The Antarctic Ross Sea Pacific Emerald Basin |
genre |
Antarc* Antarctic Ice Sheet Ross Sea |
genre_facet |
Antarc* Antarctic Ice Sheet Ross Sea |
op_source |
Evangelinos , D , Escutia , C , van de Flierdt , T , Valero , L , Flores , J A , Harwood , D M , Hoem , F S , Bijl , P , Etourneau , J , Kreissig , K , Nilsson-Kerr , K , Holder , L , López-Quirós , A & Salabarnada , A 2022 , ' Absence of a strong, deep-reaching Antarctic Circumpolar Current zonal flow across the Tasmanian gateway during the Oligocene to early Miocene ' , Global and Planetary Change , vol. 208 , 103718 . https://doi.org/10.1016/j.gloplacha.2021.103718 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.gloplacha.2021.103718 |
container_title |
Global and Planetary Change |
container_volume |
208 |
container_start_page |
103718 |
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1775346886689947648 |