Strength and variability of the Oligocene Southern Ocean surface temperature gradient
Large Oligocene Antarctic ice sheets co-existed with warm proximal waters offshore Wilkes Land. Here we provide a broader Southern Ocean perspective to such warmth by reconstructing the strength and variability of the Oligocene Australian-Antarctic latitudinal sea surface temperature gradient. Our O...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/425116 2023-11-12T04:07:12+01:00 Strength and variability of the Oligocene Southern Ocean surface temperature gradient Hoem, Frida S. Sauermilch, Isabel Aleksinski, Adam K. Huber, Matthew Peterse, Francien Sangiorgi, Francesca Bijl, Peter K. Marine palynology and palaeoceanography Organic geochemistry Marine Palynology 2022-12-22 application/pdf https://dspace.library.uu.nl/handle/1874/425116 en eng 2662-4435 https://dspace.library.uu.nl/handle/1874/425116 info:eu-repo/semantics/OpenAccess Environmental Science(all) Earth and Planetary Sciences(all) Article 2022 ftunivutrecht 2023-11-01T23:29:30Z Large Oligocene Antarctic ice sheets co-existed with warm proximal waters offshore Wilkes Land. Here we provide a broader Southern Ocean perspective to such warmth by reconstructing the strength and variability of the Oligocene Australian-Antarctic latitudinal sea surface temperature gradient. Our Oligocene TEX86-based sea surface temperature record from offshore southern Australia shows temperate (20–29 °C) conditions throughout, despite northward tectonic drift. A persistent sea surface temperature gradient (~5–10 °C) exists between Australia and Antarctica, which increases during glacial intervals. The sea surface temperature gradient increases from ~26 Ma, due to Antarctic-proximal cooling. Meanwhile, benthic foraminiferal oxygen isotope decline indicates ice loss/deep-sea warming. These contrasting patterns are difficult to explain by greenhouse gas forcing alone. Timing of the sea surface temperature cooling coincides with deepening of Drake Passage and matches results of ocean model experiments that demonstrate that Drake Passage opening cools Antarctic proximal waters. We conclude that Drake Passage deepening cooled Antarctic coasts which enhanced thermal isolation of Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica Drake Passage Southern Ocean Wilkes Land Utrecht University Repository Antarctic Southern Ocean Drake Passage Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) |
institution |
Open Polar |
collection |
Utrecht University Repository |
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ftunivutrecht |
language |
English |
topic |
Environmental Science(all) Earth and Planetary Sciences(all) |
spellingShingle |
Environmental Science(all) Earth and Planetary Sciences(all) Hoem, Frida S. Sauermilch, Isabel Aleksinski, Adam K. Huber, Matthew Peterse, Francien Sangiorgi, Francesca Bijl, Peter K. Strength and variability of the Oligocene Southern Ocean surface temperature gradient |
topic_facet |
Environmental Science(all) Earth and Planetary Sciences(all) |
description |
Large Oligocene Antarctic ice sheets co-existed with warm proximal waters offshore Wilkes Land. Here we provide a broader Southern Ocean perspective to such warmth by reconstructing the strength and variability of the Oligocene Australian-Antarctic latitudinal sea surface temperature gradient. Our Oligocene TEX86-based sea surface temperature record from offshore southern Australia shows temperate (20–29 °C) conditions throughout, despite northward tectonic drift. A persistent sea surface temperature gradient (~5–10 °C) exists between Australia and Antarctica, which increases during glacial intervals. The sea surface temperature gradient increases from ~26 Ma, due to Antarctic-proximal cooling. Meanwhile, benthic foraminiferal oxygen isotope decline indicates ice loss/deep-sea warming. These contrasting patterns are difficult to explain by greenhouse gas forcing alone. Timing of the sea surface temperature cooling coincides with deepening of Drake Passage and matches results of ocean model experiments that demonstrate that Drake Passage opening cools Antarctic proximal waters. We conclude that Drake Passage deepening cooled Antarctic coasts which enhanced thermal isolation of Antarctica. |
author2 |
Marine palynology and palaeoceanography Organic geochemistry Marine Palynology |
format |
Article in Journal/Newspaper |
author |
Hoem, Frida S. Sauermilch, Isabel Aleksinski, Adam K. Huber, Matthew Peterse, Francien Sangiorgi, Francesca Bijl, Peter K. |
author_facet |
Hoem, Frida S. Sauermilch, Isabel Aleksinski, Adam K. Huber, Matthew Peterse, Francien Sangiorgi, Francesca Bijl, Peter K. |
author_sort |
Hoem, Frida S. |
title |
Strength and variability of the Oligocene Southern Ocean surface temperature gradient |
title_short |
Strength and variability of the Oligocene Southern Ocean surface temperature gradient |
title_full |
Strength and variability of the Oligocene Southern Ocean surface temperature gradient |
title_fullStr |
Strength and variability of the Oligocene Southern Ocean surface temperature gradient |
title_full_unstemmed |
Strength and variability of the Oligocene Southern Ocean surface temperature gradient |
title_sort |
strength and variability of the oligocene southern ocean surface temperature gradient |
publishDate |
2022 |
url |
https://dspace.library.uu.nl/handle/1874/425116 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic Southern Ocean Drake Passage Wilkes Land |
geographic_facet |
Antarctic Southern Ocean Drake Passage Wilkes Land |
genre |
Antarc* Antarctic Antarctica Drake Passage Southern Ocean Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctica Drake Passage Southern Ocean Wilkes Land |
op_relation |
2662-4435 https://dspace.library.uu.nl/handle/1874/425116 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782327978316791808 |