气候变化领域集成服务门户(CCPortal): Deep Atlantic Ocean carbon storage and the rise of 100,000-year glacial cycles

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DOI	10.1038/s41561-019-0334-6
	Deep Atlantic Ocean carbon storage and the rise of 100,000-year glacial cycles
	Farmer J.R.; Hönisch B.; Haynes L.L.; Kroon D.; Jung S.; Ford H.L.; Raymo M.E.; Jaume-Seguí M.; Bell D.B.; Goldstein S.L.; Pena L.D.; Yehudai M.; Kim J.
发表日期	2019
ISSN	17520894
卷号	12 期号:5
英文摘要	Over the past three million years, Earth’s climate oscillated between warmer interglacials with reduced terrestrial ice volume and cooler glacials with expanded polar ice sheets. These climate cycles, as reflected in benthic foraminiferal oxygen isotopes, transitioned from dominantly 41-kyr to 100-kyr periodicities during the mid-Pleistocene 1,250 to 700 kyr ago (ka). Because orbital forcing did not shift at this time, the ultimate cause of this mid-Pleistocene transition remains enigmatic. Here we present foraminiferal trace element (B/Ca, Cd/Ca) and Nd isotope data that demonstrate a close linkage between Atlantic Ocean meridional overturning circulation and deep ocean carbon storage across the mid-Pleistocene transition. Specifically, between 950 and 900 ka, carbonate ion saturation decreased by 30 µmol kg−1 and phosphate concentration increased by 0.5 µmol kg−1 coincident with a 20% reduction of North Atlantic Deep Water contribution to the abyssal South Atlantic. These results demonstrate that the glacial deep Atlantic carbon inventory increased by approximately 50 Gt during the transition to 100-kyr glacial cycles. We suggest that the coincidence of our observations with evidence for increased terrestrial ice volume reflects how weaker overturning circulation and Southern Ocean biogeochemical feedbacks facilitated deep ocean carbon storage, which lowered the atmospheric partial pressure of CO2 and thereby enabled expanded terrestrial ice volume at the mid-Pleistocene transition. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	calcium carbonate; carbon dioxide; carbon sequestration; climate cycle; glacial-interglacial cycle; ice sheet; North Atlantic Deep Water; orbital forcing; partial pressure; Pleistocene; trace element; Atlantic Ocean; Atlantic Ocean (North); Atlantic Ocean (South); Southern Ocean
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124675
作者单位	Department of Earth and Environmental Sciences, Columbia University, New York, NY, United States; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; School of GeoSciences, University of Edinburgh, Edinburgh, United Kingdom; School of Geography, Queen Mary University of London, London, United Kingdom; Department of Earth and Ocean Dynamics, University of Barcelona, Barcelona, Spain; Department of Geosciences, Princeton University, Princeton, NJ, United States; Max-Planck Institut für Chemie, Mainz, Germany
推荐引用方式 GB/T 7714	Farmer J.R.,Hönisch B.,Haynes L.L.,et al. Deep Atlantic Ocean carbon storage and the rise of 100,000-year glacial cycles[J],2019,12(5).
APA	Farmer J.R..,Hönisch B..,Haynes L.L..,Kroon D..,Jung S..,...&Kim J..(2019).Deep Atlantic Ocean carbon storage and the rise of 100,000-year glacial cycles.Nature Geoscience,12(5).
MLA	Farmer J.R.,et al."Deep Atlantic Ocean carbon storage and the rise of 100,000-year glacial cycles".Nature Geoscience 12.5(2019).