Bajo, Petra and Drysdale, Russell N. and Woodhead, Jon D. and Hellstrom, John C. and Hodell, David and Ferretti, Patrizia and Voelker, Antje H. L. and Zanchetta, Giovanni and Rodrigues, Teresa and Wolff, Eric and Tyler, Jonathan and Frisia, Silvia and Spötl, Christoph and Fallick, Anthony E. (2020) Persistent influence of obliquity on ice age terminations since the Middle Pleistocene transition. Science, 367 (6483). pp. 1235-1239. ISSN 0036-8075 DOI https://doi.org/10.1126/science.aaw1114
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Abstract
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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | 2020AREP; IA76 |
| Subjects: | 01 - Climate Change and Earth-Ocean Atmosphere Systems |
| Divisions: | 01 - Climate Change and Earth-Ocean Atmosphere Systems 08 - Green Open Access |
| Journal or Publication Title: | Science |
| Volume: | 367 |
| Page Range: | pp. 1235-1239 |
| Identification Number: | https://doi.org/10.1126/science.aaw1114 |
| Depositing User: | Sarah Humbert |
| Date Deposited: | 08 Apr 2020 22:50 |
| Last Modified: | 08 Apr 2020 22:50 |
| URI: | http://eprints.esc.cam.ac.uk/id/eprint/4673 |
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