Orbitally induced oscillations in the East Antarctic ice sheet at the Oligocene/Miocene boundary
Between 34 and 15 million years (Myr) ago, when planetary temperatures were 3–4 °C warmer than at present and atmospheric CO2 concentrations were twice as high as today1, the Antarctic ice sheets may have been unstable2, 3, 4, 5, 6, 7. Oxygen isotope records from deep-sea sediment cores suggest that...
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ftjamescook:oai:researchonline.jcu.edu.au:13353 2024-02-11T09:58:36+01:00 Orbitally induced oscillations in the East Antarctic ice sheet at the Oligocene/Miocene boundary Naish, Tim R. Woolfe, Ken J. Barrett, Peter J. Wilson, Gary S. Atkins, Cliff Bohaty, Steven M. Bücker, Christian J. Claps, Michele Davy, Fred J. Dunbar, Gavin B. Dunn, Alistair G. Fielding, Chris R. Florindo, Fabio Hannah, Michael J. Harwood, David M. Henrys, Stuart A. Krissek, Lawrence A. Lavelle, Mark van der Meer, Jaap McIntosh, William Niessen, Frank Passchier, Sandra Powell, Ross D. Roberts, Andrew P. Sagnotti, Leonardo Scherer, Reed P. Strong, C. Percy Talarico, Franco Verosub, Kenneth L. Vila, Giuliana Watkins, David K. Webb, Peter-N. Wonik, Thomas 2001-10-18 application/pdf https://researchonline.jcu.edu.au/13353/1/13353_Naish_et_al_2001.pdf unknown Nature Publishing Group http://dx.doi.org/10.1038/35099534 https://researchonline.jcu.edu.au/13353/ https://researchonline.jcu.edu.au/13353/1/13353_Naish_et_al_2001.pdf Naish, Tim R., Woolfe, Ken J., Barrett, Peter J., Wilson, Gary S., Atkins, Cliff, Bohaty, Steven M., Bücker, Christian J., Claps, Michele, Davy, Fred J., Dunbar, Gavin B., Dunn, Alistair G., Fielding, Chris R., Florindo, Fabio, Hannah, Michael J., Harwood, David M., Henrys, Stuart A., Krissek, Lawrence A., Lavelle, Mark, van der Meer, Jaap, McIntosh, William, Niessen, Frank, Passchier, Sandra, Powell, Ross D., Roberts, Andrew P., Sagnotti, Leonardo, Scherer, Reed P., Strong, C. Percy, Talarico, Franco, Verosub, Kenneth L., Vila, Giuliana, Watkins, David K., Webb, Peter-N., and Wonik, Thomas (2001) Orbitally induced oscillations in the East Antarctic ice sheet at the Oligocene/Miocene boundary. Nature, 413 (6857). pp. 719-723. restricted Article PeerReviewed 2001 ftjamescook https://doi.org/10.1038/35099534 2024-01-15T23:26:59Z Between 34 and 15 million years (Myr) ago, when planetary temperatures were 3–4 °C warmer than at present and atmospheric CO2 concentrations were twice as high as today1, the Antarctic ice sheets may have been unstable2, 3, 4, 5, 6, 7. Oxygen isotope records from deep-sea sediment cores suggest that during this time fluctuations in global temperatures and high-latitude continental ice volumes were influenced by orbital cycles8, 9, 10. But it has hitherto not been possible to calibrate the inferred changes in ice volume with direct evidence for oscillations of the Antarctic ice sheets11. Here we present sediment data from shallow marine cores in the western Ross Sea that exhibit well dated cyclic variations, and which link the extent of the East Antarctic ice sheet directly to orbital cycles during the Oligocene/Miocene transition (24.1–23.7 Myr ago). Three rapidly deposited glacimarine sequences are constrained to a period of less than 450 kyr by our age model, suggesting that orbital influences at the frequencies of obliquity (40 kyr) and eccentricity (125 kyr) controlled the oscillations of the ice margin at that time. An erosional hiatus covering 250 kyr provides direct evidence for a major episode of global cooling and ice-sheet expansion about 23.7 Myr ago, which had previously been inferred from oxygen isotope data (Mi1 event5). Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Ross Sea James Cook University, Australia: ResearchOnline@JCU Antarctic East Antarctic Ice Sheet Ross Sea The Antarctic Nature 413 6857 719 723 |
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Open Polar |
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James Cook University, Australia: ResearchOnline@JCU |
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ftjamescook |
language |
unknown |
description |
Between 34 and 15 million years (Myr) ago, when planetary temperatures were 3–4 °C warmer than at present and atmospheric CO2 concentrations were twice as high as today1, the Antarctic ice sheets may have been unstable2, 3, 4, 5, 6, 7. Oxygen isotope records from deep-sea sediment cores suggest that during this time fluctuations in global temperatures and high-latitude continental ice volumes were influenced by orbital cycles8, 9, 10. But it has hitherto not been possible to calibrate the inferred changes in ice volume with direct evidence for oscillations of the Antarctic ice sheets11. Here we present sediment data from shallow marine cores in the western Ross Sea that exhibit well dated cyclic variations, and which link the extent of the East Antarctic ice sheet directly to orbital cycles during the Oligocene/Miocene transition (24.1–23.7 Myr ago). Three rapidly deposited glacimarine sequences are constrained to a period of less than 450 kyr by our age model, suggesting that orbital influences at the frequencies of obliquity (40 kyr) and eccentricity (125 kyr) controlled the oscillations of the ice margin at that time. An erosional hiatus covering 250 kyr provides direct evidence for a major episode of global cooling and ice-sheet expansion about 23.7 Myr ago, which had previously been inferred from oxygen isotope data (Mi1 event5). |
format |
Article in Journal/Newspaper |
author |
Naish, Tim R. Woolfe, Ken J. Barrett, Peter J. Wilson, Gary S. Atkins, Cliff Bohaty, Steven M. Bücker, Christian J. Claps, Michele Davy, Fred J. Dunbar, Gavin B. Dunn, Alistair G. Fielding, Chris R. Florindo, Fabio Hannah, Michael J. Harwood, David M. Henrys, Stuart A. Krissek, Lawrence A. Lavelle, Mark van der Meer, Jaap McIntosh, William Niessen, Frank Passchier, Sandra Powell, Ross D. Roberts, Andrew P. Sagnotti, Leonardo Scherer, Reed P. Strong, C. Percy Talarico, Franco Verosub, Kenneth L. Vila, Giuliana Watkins, David K. Webb, Peter-N. Wonik, Thomas |
spellingShingle |
Naish, Tim R. Woolfe, Ken J. Barrett, Peter J. Wilson, Gary S. Atkins, Cliff Bohaty, Steven M. Bücker, Christian J. Claps, Michele Davy, Fred J. Dunbar, Gavin B. Dunn, Alistair G. Fielding, Chris R. Florindo, Fabio Hannah, Michael J. Harwood, David M. Henrys, Stuart A. Krissek, Lawrence A. Lavelle, Mark van der Meer, Jaap McIntosh, William Niessen, Frank Passchier, Sandra Powell, Ross D. Roberts, Andrew P. Sagnotti, Leonardo Scherer, Reed P. Strong, C. Percy Talarico, Franco Verosub, Kenneth L. Vila, Giuliana Watkins, David K. Webb, Peter-N. Wonik, Thomas Orbitally induced oscillations in the East Antarctic ice sheet at the Oligocene/Miocene boundary |
author_facet |
Naish, Tim R. Woolfe, Ken J. Barrett, Peter J. Wilson, Gary S. Atkins, Cliff Bohaty, Steven M. Bücker, Christian J. Claps, Michele Davy, Fred J. Dunbar, Gavin B. Dunn, Alistair G. Fielding, Chris R. Florindo, Fabio Hannah, Michael J. Harwood, David M. Henrys, Stuart A. Krissek, Lawrence A. Lavelle, Mark van der Meer, Jaap McIntosh, William Niessen, Frank Passchier, Sandra Powell, Ross D. Roberts, Andrew P. Sagnotti, Leonardo Scherer, Reed P. Strong, C. Percy Talarico, Franco Verosub, Kenneth L. Vila, Giuliana Watkins, David K. Webb, Peter-N. Wonik, Thomas |
author_sort |
Naish, Tim R. |
title |
Orbitally induced oscillations in the East Antarctic ice sheet at the Oligocene/Miocene boundary |
title_short |
Orbitally induced oscillations in the East Antarctic ice sheet at the Oligocene/Miocene boundary |
title_full |
Orbitally induced oscillations in the East Antarctic ice sheet at the Oligocene/Miocene boundary |
title_fullStr |
Orbitally induced oscillations in the East Antarctic ice sheet at the Oligocene/Miocene boundary |
title_full_unstemmed |
Orbitally induced oscillations in the East Antarctic ice sheet at the Oligocene/Miocene boundary |
title_sort |
orbitally induced oscillations in the east antarctic ice sheet at the oligocene/miocene boundary |
publisher |
Nature Publishing Group |
publishDate |
2001 |
url |
https://researchonline.jcu.edu.au/13353/1/13353_Naish_et_al_2001.pdf |
geographic |
Antarctic East Antarctic Ice Sheet Ross Sea The Antarctic |
geographic_facet |
Antarctic East Antarctic Ice Sheet Ross Sea The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Ross Sea |
genre_facet |
Antarc* Antarctic Ice Sheet Ross Sea |
op_relation |
http://dx.doi.org/10.1038/35099534 https://researchonline.jcu.edu.au/13353/ https://researchonline.jcu.edu.au/13353/1/13353_Naish_et_al_2001.pdf Naish, Tim R., Woolfe, Ken J., Barrett, Peter J., Wilson, Gary S., Atkins, Cliff, Bohaty, Steven M., Bücker, Christian J., Claps, Michele, Davy, Fred J., Dunbar, Gavin B., Dunn, Alistair G., Fielding, Chris R., Florindo, Fabio, Hannah, Michael J., Harwood, David M., Henrys, Stuart A., Krissek, Lawrence A., Lavelle, Mark, van der Meer, Jaap, McIntosh, William, Niessen, Frank, Passchier, Sandra, Powell, Ross D., Roberts, Andrew P., Sagnotti, Leonardo, Scherer, Reed P., Strong, C. Percy, Talarico, Franco, Verosub, Kenneth L., Vila, Giuliana, Watkins, David K., Webb, Peter-N., and Wonik, Thomas (2001) Orbitally induced oscillations in the East Antarctic ice sheet at the Oligocene/Miocene boundary. Nature, 413 (6857). pp. 719-723. |
op_rights |
restricted |
op_doi |
https://doi.org/10.1038/35099534 |
container_title |
Nature |
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413 |
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6857 |
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719 |
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723 |
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