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

• 成果类型: Article
• 署名作者: Barker, Stephen; Lisiecki, Lorraine E.; Knorr, Gregor; Nuber, Sophie; Tzedakis, Polychronis C.
• 署名单位: Cardiff University; University of California System; University of California Santa Barbara; Helmholtz Association; Alfred Wegener Institute, Helmholtz Centre for Polar & Marine Research; University of London; University College London; University of Washington; University of Washington Seattle
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8694
• DOI: 10.1126/science.adp3491
• 发表日期: 2025-02-28
• 关键词: antarctic ice; persistent influence; chronology aicc2012; ocean temperature; atmospheric co2; sea-level; climate; variability; insolation; EVOLUTION

摘要

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.