Climatic and tectonic drivers of late Oligocene Antarctic ice volume
Cenozoic evolution of the Antarctic ice sheets is thought to be driven primarily by long-term changes in radiative forcing, but the tectonic evolution of Antarctica may also have played a substantive role. While deep-sea foraminiferal oxygen isotope records provide a combined measure of global conti...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/424985 2023-07-23T04:14:12+02:00 Climatic and tectonic drivers of late Oligocene Antarctic ice volume Duncan, B. Mckay, R. Levy, R. Naish, T. Prebble, J. G. Sangiorgi, F. Krishnan, S. Hoem, F. Clowes, C. Dunkley jones, T. Gasson, E. Kraus, C. Kulhanek, D. K. Meyers, S. R. Moossen, H. Warren, C. Willmott, V. Ventura, G. T. Bendle, J. Marine palynology and palaeoceanography Marine Palynology 2022-10 application/pdf https://dspace.library.uu.nl/handle/1874/424985 en eng 1752-0894 https://dspace.library.uu.nl/handle/1874/424985 info:eu-repo/semantics/ClosedAccess Article 2022 ftunivutrecht 2023-07-02T03:49:48Z Cenozoic evolution of the Antarctic ice sheets is thought to be driven primarily by long-term changes in radiative forcing, but the tectonic evolution of Antarctica may also have played a substantive role. While deep-sea foraminiferal oxygen isotope records provide a combined measure of global continental ice volume and ocean temperature, they do not provide direct insights into non-radiative influences on Antarctic Ice Sheet dynamics. Here we present an Antarctic compilation of Cenozoic upper-ocean temperature for the Ross Sea and offshore Wilkes Land, generated by membrane lipid distributions from archaea. We find trends of ocean temperature, atmospheric carbon dioxide and oxygen isotopes largely co-vary. However, this relationship is less clear for the late Oligocene, when high-latitude cooling occurred despite interpretation of oxygen isotopes suggesting global warming and ice-volume loss. We propose this retreat of the West Antarctic Ice Sheet occurred in response to a tectonically driven marine transgression, with warm surface waters precluding marine-based ice-sheet growth. Marine ice-sheet expansion occurred only when ocean temperatures further cooled during the Oligocene–Miocene transition, with cold orbital conditions and low atmospheric carbon dioxide. Our results support a threshold response to atmospheric carbon dioxide, below which Antarctica’s marine ice sheets grow, and above which ocean warming exacerbates their retreat. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ross Sea Wilkes Land Utrecht University Repository Antarctic Ross Sea The Antarctic West Antarctic Ice Sheet Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) |
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Open Polar |
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Utrecht University Repository |
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ftunivutrecht |
language |
English |
description |
Cenozoic evolution of the Antarctic ice sheets is thought to be driven primarily by long-term changes in radiative forcing, but the tectonic evolution of Antarctica may also have played a substantive role. While deep-sea foraminiferal oxygen isotope records provide a combined measure of global continental ice volume and ocean temperature, they do not provide direct insights into non-radiative influences on Antarctic Ice Sheet dynamics. Here we present an Antarctic compilation of Cenozoic upper-ocean temperature for the Ross Sea and offshore Wilkes Land, generated by membrane lipid distributions from archaea. We find trends of ocean temperature, atmospheric carbon dioxide and oxygen isotopes largely co-vary. However, this relationship is less clear for the late Oligocene, when high-latitude cooling occurred despite interpretation of oxygen isotopes suggesting global warming and ice-volume loss. We propose this retreat of the West Antarctic Ice Sheet occurred in response to a tectonically driven marine transgression, with warm surface waters precluding marine-based ice-sheet growth. Marine ice-sheet expansion occurred only when ocean temperatures further cooled during the Oligocene–Miocene transition, with cold orbital conditions and low atmospheric carbon dioxide. Our results support a threshold response to atmospheric carbon dioxide, below which Antarctica’s marine ice sheets grow, and above which ocean warming exacerbates their retreat. |
author2 |
Marine palynology and palaeoceanography Marine Palynology |
format |
Article in Journal/Newspaper |
author |
Duncan, B. Mckay, R. Levy, R. Naish, T. Prebble, J. G. Sangiorgi, F. Krishnan, S. Hoem, F. Clowes, C. Dunkley jones, T. Gasson, E. Kraus, C. Kulhanek, D. K. Meyers, S. R. Moossen, H. Warren, C. Willmott, V. Ventura, G. T. Bendle, J. |
spellingShingle |
Duncan, B. Mckay, R. Levy, R. Naish, T. Prebble, J. G. Sangiorgi, F. Krishnan, S. Hoem, F. Clowes, C. Dunkley jones, T. Gasson, E. Kraus, C. Kulhanek, D. K. Meyers, S. R. Moossen, H. Warren, C. Willmott, V. Ventura, G. T. Bendle, J. Climatic and tectonic drivers of late Oligocene Antarctic ice volume |
author_facet |
Duncan, B. Mckay, R. Levy, R. Naish, T. Prebble, J. G. Sangiorgi, F. Krishnan, S. Hoem, F. Clowes, C. Dunkley jones, T. Gasson, E. Kraus, C. Kulhanek, D. K. Meyers, S. R. Moossen, H. Warren, C. Willmott, V. Ventura, G. T. Bendle, J. |
author_sort |
Duncan, B. |
title |
Climatic and tectonic drivers of late Oligocene Antarctic ice volume |
title_short |
Climatic and tectonic drivers of late Oligocene Antarctic ice volume |
title_full |
Climatic and tectonic drivers of late Oligocene Antarctic ice volume |
title_fullStr |
Climatic and tectonic drivers of late Oligocene Antarctic ice volume |
title_full_unstemmed |
Climatic and tectonic drivers of late Oligocene Antarctic ice volume |
title_sort |
climatic and tectonic drivers of late oligocene antarctic ice volume |
publishDate |
2022 |
url |
https://dspace.library.uu.nl/handle/1874/424985 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic Ross Sea The Antarctic West Antarctic Ice Sheet Wilkes Land |
geographic_facet |
Antarctic Ross Sea The Antarctic West Antarctic Ice Sheet Wilkes Land |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ross Sea Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ross Sea Wilkes Land |
op_relation |
1752-0894 https://dspace.library.uu.nl/handle/1874/424985 |
op_rights |
info:eu-repo/semantics/ClosedAccess |
_version_ |
1772183474562662400 |