Deep-water coral records of glacial and recent ocean-atmosphere dynamics from the Perth Canyon in the southeast Indian Ocean
We present radiocarbon and neodymium isotope records from accurately dated (U-series) live and fossil (<2 ka, 17.5 to 29.6 ka BP) deep-water corals, collected between 675 and 1788 m from the Perth Canyon, offshore southwest Australia. These records provide the first insights into recent and last...
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ftdoajarticles:oai:doaj.org/article:5af254b4e4ae4586a5bace766db17f03 2023-05-15T13:46:45+02:00 Deep-water coral records of glacial and recent ocean-atmosphere dynamics from the Perth Canyon in the southeast Indian Ocean Julie A. Trotter Malcolm T. McCulloch Juan Pablo D'Olivo Pete Scott Nadine Tisnérat-Laborde Marco Taviani Paolo Montagna 2022-04-01T00:00:00Z https://doi.org/10.1016/j.qsa.2022.100052 https://doaj.org/article/5af254b4e4ae4586a5bace766db17f03 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S2666033422000053 https://doaj.org/toc/2666-0334 2666-0334 doi:10.1016/j.qsa.2022.100052 https://doaj.org/article/5af254b4e4ae4586a5bace766db17f03 Quaternary Science Advances, Vol 6, Iss , Pp 100052- (2022) Deep-water coral Indian Ocean Nd isotopes Ocean ventilation Last Glacial Maximum Perth Canyon Geography. Anthropology. Recreation G Archaeology CC1-960 article 2022 ftdoajarticles https://doi.org/10.1016/j.qsa.2022.100052 2022-12-31T01:55:53Z We present radiocarbon and neodymium isotope records from accurately dated (U-series) live and fossil (<2 ka, 17.5 to 29.6 ka BP) deep-water corals, collected between 675 and 1788 m from the Perth Canyon, offshore southwest Australia. These records provide the first insights into recent and last glacial intermediate-deep water circulation and ventilation histories from the poorly represented southeast Indian Ocean. Ocean ventilation fluctuated significantly during the last glacial period, being highly ventilated during early Marine Isotope Stage 2 and the early deglaciation, yet less ventilated and more stratified during the Last Glacial Maximum. Furthermore, the Perth Canyon corals recorded a major and rapid (∼300 years) perturbation at 25 ka, indicating that mid-depth waters were exposed to poorly ventilated, unradiogenic Nd deeper waters. We link this to similar, age equivalent changes at geographically disparate sites from the southeast Atlantic to the Southern Ocean south of Tasmania, together with fluctuations in Antarctic sea-ice, oceanic fronts, and Atlantic Meridional Overturning Circulation (AMOC). This widespread Southern Ocean event indicates a transient breach in upper and lower ocean cell boundaries of the MOC, providing further evidence for the non-steady state, zonal dynamics of the glacial Southern Ocean. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean Indian Quaternary Science Advances 6 100052 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Deep-water coral Indian Ocean Nd isotopes Ocean ventilation Last Glacial Maximum Perth Canyon Geography. Anthropology. Recreation G Archaeology CC1-960 |
spellingShingle |
Deep-water coral Indian Ocean Nd isotopes Ocean ventilation Last Glacial Maximum Perth Canyon Geography. Anthropology. Recreation G Archaeology CC1-960 Julie A. Trotter Malcolm T. McCulloch Juan Pablo D'Olivo Pete Scott Nadine Tisnérat-Laborde Marco Taviani Paolo Montagna Deep-water coral records of glacial and recent ocean-atmosphere dynamics from the Perth Canyon in the southeast Indian Ocean |
topic_facet |
Deep-water coral Indian Ocean Nd isotopes Ocean ventilation Last Glacial Maximum Perth Canyon Geography. Anthropology. Recreation G Archaeology CC1-960 |
description |
We present radiocarbon and neodymium isotope records from accurately dated (U-series) live and fossil (<2 ka, 17.5 to 29.6 ka BP) deep-water corals, collected between 675 and 1788 m from the Perth Canyon, offshore southwest Australia. These records provide the first insights into recent and last glacial intermediate-deep water circulation and ventilation histories from the poorly represented southeast Indian Ocean. Ocean ventilation fluctuated significantly during the last glacial period, being highly ventilated during early Marine Isotope Stage 2 and the early deglaciation, yet less ventilated and more stratified during the Last Glacial Maximum. Furthermore, the Perth Canyon corals recorded a major and rapid (∼300 years) perturbation at 25 ka, indicating that mid-depth waters were exposed to poorly ventilated, unradiogenic Nd deeper waters. We link this to similar, age equivalent changes at geographically disparate sites from the southeast Atlantic to the Southern Ocean south of Tasmania, together with fluctuations in Antarctic sea-ice, oceanic fronts, and Atlantic Meridional Overturning Circulation (AMOC). This widespread Southern Ocean event indicates a transient breach in upper and lower ocean cell boundaries of the MOC, providing further evidence for the non-steady state, zonal dynamics of the glacial Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Julie A. Trotter Malcolm T. McCulloch Juan Pablo D'Olivo Pete Scott Nadine Tisnérat-Laborde Marco Taviani Paolo Montagna |
author_facet |
Julie A. Trotter Malcolm T. McCulloch Juan Pablo D'Olivo Pete Scott Nadine Tisnérat-Laborde Marco Taviani Paolo Montagna |
author_sort |
Julie A. Trotter |
title |
Deep-water coral records of glacial and recent ocean-atmosphere dynamics from the Perth Canyon in the southeast Indian Ocean |
title_short |
Deep-water coral records of glacial and recent ocean-atmosphere dynamics from the Perth Canyon in the southeast Indian Ocean |
title_full |
Deep-water coral records of glacial and recent ocean-atmosphere dynamics from the Perth Canyon in the southeast Indian Ocean |
title_fullStr |
Deep-water coral records of glacial and recent ocean-atmosphere dynamics from the Perth Canyon in the southeast Indian Ocean |
title_full_unstemmed |
Deep-water coral records of glacial and recent ocean-atmosphere dynamics from the Perth Canyon in the southeast Indian Ocean |
title_sort |
deep-water coral records of glacial and recent ocean-atmosphere dynamics from the perth canyon in the southeast indian ocean |
publisher |
Elsevier |
publishDate |
2022 |
url |
https://doi.org/10.1016/j.qsa.2022.100052 https://doaj.org/article/5af254b4e4ae4586a5bace766db17f03 |
geographic |
Antarctic Southern Ocean Indian |
geographic_facet |
Antarctic Southern Ocean Indian |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_source |
Quaternary Science Advances, Vol 6, Iss , Pp 100052- (2022) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S2666033422000053 https://doaj.org/toc/2666-0334 2666-0334 doi:10.1016/j.qsa.2022.100052 https://doaj.org/article/5af254b4e4ae4586a5bace766db17f03 |
op_doi |
https://doi.org/10.1016/j.qsa.2022.100052 |
container_title |
Quaternary Science Advances |
container_volume |
6 |
container_start_page |
100052 |
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1766245169638670336 |