Persistent influence of obliquity on ice age terminations since the Middle Pleistocene transition
Radiometric dating of glacial terminations over the past 640,000 years suggests pacing by Earth’s climatic precession, with each glacial-interglacial period spanning four or five cycles of ~20,000 years. However, the lack of firm age estimates for older Pleistocene terminations confounds attempts to...
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Digital Commons @ University of South Florida
2020
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Online Access: | https://digitalcommons.usf.edu/kip_articles/4009 https://doi.org/10.1126/science.aaw1114 |
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ftunisfloridatam:oai:digitalcommons.usf.edu:kip_articles-5008 2023-05-15T17:32:12+02:00 Persistent influence of obliquity on ice age terminations since the Middle Pleistocene transition Bajo, Petra Drysdale, Russell N. Woodhead, Jon D. Hellstrom, John C. Hodell, David Ferretti, Patrizia Voelker, Antje H. Zanchetta, Giovanni Rodrigues, Teresa Wolff, Eric Tyler, Jonathan Frisia, Silvia Spötl, Christoph Fallick, Anthony E. 2020-01-01T08:00:00Z https://digitalcommons.usf.edu/kip_articles/4009 https://doi.org/10.1126/science.aaw1114 unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/kip_articles/4009 https://doi.org/10.1126/science.aaw1114 KIP Articles text 2020 ftunisfloridatam https://doi.org/10.1126/science.aaw1114 2022-10-27T17:50:02Z Radiometric dating of glacial terminations over the past 640,000 years suggests pacing by Earth’s climatic precession, with each glacial-interglacial period spanning four or five cycles of ~20,000 years. However, the lack of firm age estimates for older Pleistocene terminations confounds attempts to test the persistence of precession forcing. We combine an Italian speleothem record anchored by a uranium-lead chronology with North Atlantic ocean data to show that the first two deglaciations of the so-called 100,000-year world are separated by two obliquity cycles, with each termination starting at the same high phase of obliquity, but at opposing phases of precession. An assessment of 11 radiometrically dated terminations spanning the past million years suggests that obliquity exerted a persistent influence on not only their initiation but also their duration. Text North Atlantic Digital Commons University of South Florida (USF) Science 367 6483 1235 1239 |
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Open Polar |
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Digital Commons University of South Florida (USF) |
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ftunisfloridatam |
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unknown |
description |
Radiometric dating of glacial terminations over the past 640,000 years suggests pacing by Earth’s climatic precession, with each glacial-interglacial period spanning four or five cycles of ~20,000 years. However, the lack of firm age estimates for older Pleistocene terminations confounds attempts to test the persistence of precession forcing. We combine an Italian speleothem record anchored by a uranium-lead chronology with North Atlantic ocean data to show that the first two deglaciations of the so-called 100,000-year world are separated by two obliquity cycles, with each termination starting at the same high phase of obliquity, but at opposing phases of precession. An assessment of 11 radiometrically dated terminations spanning the past million years suggests that obliquity exerted a persistent influence on not only their initiation but also their duration. |
format |
Text |
author |
Bajo, Petra Drysdale, Russell N. Woodhead, Jon D. Hellstrom, John C. Hodell, David Ferretti, Patrizia Voelker, Antje H. Zanchetta, Giovanni Rodrigues, Teresa Wolff, Eric Tyler, Jonathan Frisia, Silvia Spötl, Christoph Fallick, Anthony E. |
spellingShingle |
Bajo, Petra Drysdale, Russell N. Woodhead, Jon D. Hellstrom, John C. Hodell, David Ferretti, Patrizia Voelker, Antje H. Zanchetta, Giovanni Rodrigues, Teresa Wolff, Eric Tyler, Jonathan Frisia, Silvia Spötl, Christoph Fallick, Anthony E. Persistent influence of obliquity on ice age terminations since the Middle Pleistocene transition |
author_facet |
Bajo, Petra Drysdale, Russell N. Woodhead, Jon D. Hellstrom, John C. Hodell, David Ferretti, Patrizia Voelker, Antje H. Zanchetta, Giovanni Rodrigues, Teresa Wolff, Eric Tyler, Jonathan Frisia, Silvia Spötl, Christoph Fallick, Anthony E. |
author_sort |
Bajo, Petra |
title |
Persistent influence of obliquity on ice age terminations since the Middle Pleistocene transition |
title_short |
Persistent influence of obliquity on ice age terminations since the Middle Pleistocene transition |
title_full |
Persistent influence of obliquity on ice age terminations since the Middle Pleistocene transition |
title_fullStr |
Persistent influence of obliquity on ice age terminations since the Middle Pleistocene transition |
title_full_unstemmed |
Persistent influence of obliquity on ice age terminations since the Middle Pleistocene transition |
title_sort |
persistent influence of obliquity on ice age terminations since the middle pleistocene transition |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2020 |
url |
https://digitalcommons.usf.edu/kip_articles/4009 https://doi.org/10.1126/science.aaw1114 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
KIP Articles |
op_relation |
https://digitalcommons.usf.edu/kip_articles/4009 https://doi.org/10.1126/science.aaw1114 |
op_doi |
https://doi.org/10.1126/science.aaw1114 |
container_title |
Science |
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367 |
container_issue |
6483 |
container_start_page |
1235 |
op_container_end_page |
1239 |
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1766130200043585536 |