Revisiting the mid-Pleistocene transition ocean circulation crisis

• 成果类型: Article
• 署名作者: Hines, Sophia K. V.; Charles, Christopher D.; Starr, Aidan; Goldstein, Steven L.; Hemming, Sidney R.; Hall, Ian R.; Lathika, Nambiyathodi; Passacantando, Mollie; Bolge, Louise
• 署名单位: Woods Hole Oceanographic Institution; University of California System; University of California San Diego; Scripps Institution of Oceanography; Rutgers University System; Rutgers University New Brunswick; University of Cambridge; Columbia University; Columbia University; Cardiff University; Ministry of Earth Sciences (MoES) - India; National Centre for Polar and Ocean Research (NCPOR); University of Rhode Island
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-9765
• DOI: 10.1126/science.adn4154
• 发表日期: 2024-11-08
• 页码: 681-686
• 关键词: carbon-dioxide concentration; antarctic sea-ice; atmospheric co2; overturning circulation; southern-ocean; atlantic; climate; nd; cycles; volume

摘要

The mid-Pleistocene transition (MPT) [similar to 1.25 to 0.85 million years ago (Ma)] marks a shift in the character of glacial-interglacial climate (1, 2). One prevailing hypothesis for the origin of the MPT is that glacial deep ocean circulation fundamentally changed, marked by a circulation crisis at similar to 0.90 Ma (marine isotope stages 24 to 22) (3). Using high-resolution paired neodymium, carbon, and oxygen isotope data from the South Atlantic Ocean (Cape Basin) across the MPT, we find no evidence of a substantial change in deep ocean circulation. Before and during the early MPT (similar to 1.30 to 1.12 Ma), the glacial deep ocean variability closely resembled that of the most recent glacial cycle. The carbon storage facilitated by developing deep ocean stratification across the MPT required only modest circulation adjustments.