DOI: 10.1038/ngeo2688
论文题名: Incursions of southern-sourced water into the deep North Atlantic during late Pliocene glacial intensification
作者: Lang D.C. ; Bailey I. ; Wilson P.A. ; Chalk T.B. ; Foster G.L. ; Gutjahr M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 5 起始页码: 375
结束页码: 379
语种: 英语
Scopus关键词: carbon dioxide
; carbon isotope
; deep sea
; glaciation
; Holocene
; isotopic composition
; Last Glacial
; marine sediment
; neodymium isotope
; new record
; Northern Hemisphere
; oceanic circulation
; Pliocene
; sea ice
; stratification
; Atlantic Ocean
; Atlantic Ocean (North)
; Eurasia
; North America
; Southern Ocean
英文摘要: The circulation and internal structure of the oceans exert a strong influence on Earth's climate because they control latitudinal heat transport and the segregation of carbon between the atmosphere and the abyss. Circulation change, particularly in the Atlantic Ocean, is widely suggested to have been instrumental in the intensification of Northern Hemisphere glaciation when large ice sheets first developed on North America and Eurasia during the late Pliocene, approximately 2.7 million years ago. Yet the mechanistic link and cause/effect relationship between ocean circulation and glaciation are debated. Here we present new records of North Atlantic Ocean structure using the carbon and neodymium isotopic composition of marine sediments recording deep water for both the Last Glacial to Holocene (35-5 thousand years ago) and the late Pliocene to earliest Pleistocene (3.3-2.4 million years ago). Our data show no secular change. Instead we document major southern-sourced water incursions into the deep North Atlantic during prominent glacials from 2.7 million years ago. Our results suggest that Atlantic circulation acts as a positive feedback rather than as an underlying cause of late Pliocene Northern Hemisphere glaciation. We propose that, once surface Southern Ocean stratification and/or extensive sea-ice cover was established, cold-stage expansions of southern-sourced water such as those documented here enhanced carbon dioxide storage in the deep ocean, helping to increase the amplitude of glacial cycles. © 2016 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106021
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: National Oceanography Centre Southampton, University of Southampton, Waterfront Campus, Southampton, United Kingdom; Camborne School of Mines and Environment, Sustainability Institute, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Penryn Campus, Treliever Road, Penryn, Cornwall, United Kingdom; Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstraße 1-3, Kiel, Germany
Recommended Citation:
Lang D.C.,Bailey I.,Wilson P.A.,et al. Incursions of southern-sourced water into the deep North Atlantic during late Pliocene glacial intensification[J]. Nature Geoscience,2016-01-01,9(5)