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Distinct roles for precession, obliquity, and eccentricity in Pleistocene 100-kyr glacial cycles

Barker, Stephen; Lisiecki, Lorraine E; Knorr, Gregor; Nuber, Sophie; Tzedakis, Polychronis C; (2025) Distinct roles for precession, obliquity, and eccentricity in Pleistocene 100-kyr glacial cycles. Science , 387 (6737) , Article eadp3491. 10.1126/science.adp3491. Green open access

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Abstract

Identifying the specific roles of precession, obliquity, and eccentricity in glacial-interglacial transitions is hindered by imprecise age control. We circumvent this problem by focusing on the morphology of deglaciation and inception, which we show depends strongly on the relative phasing of precession versus obliquity. We demonstrate that although both parameters are important, precession has more influence on deglacial onset, whereas obliquity is more important for the attainment of peak interglacial conditions and glacial inception. We find that the set of precession peaks (minima) responsible for terminations since 0.9 million years ago is a subset of those peaks that begin (i.e., the precession parameter starts decreasing) while obliquity is increasing. Specifically, termination occurs with the first of these candidate peaks to occur after each eccentricity minimum. Thus, the gross morphology of 100-thousand-year (100-kyr) glacial cycles appears largely deterministic.

Type: Article
Title: Distinct roles for precession, obliquity, and eccentricity in Pleistocene 100-kyr glacial cycles
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1126/science.adp3491
Publisher version: https://doi.org/10.1126/science.adp3491
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography
URI: https://discovery.ucl.ac.uk/id/eprint/10205595
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