globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2017.12.016
Scopus记录号: 2-s2.0-85039775234
论文题名:
Astronomically paced changes in deep-water circulation in the western North Atlantic during the middle Eocene
作者: Vahlenkamp M.; Niezgodzki I.; De Vleeschouwer D.; Bickert T.; Harper D.; Kirtland Turner S.; Lohmann G.; Sexton P.; Zachos J.; Pälike H.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 484
起始页码: 329
结束页码: 340
语种: 英语
英文关键词: AMOC ; astronomical forcing ; IODP ; middle Eocene ; NADW
Scopus关键词: Climate change ; Earth atmosphere ; Nutrients ; AMOC ; Astronomical forcing ; IODP ; middle Eocene ; NADW ; Oceanography ; cooling ; deep water ; Eocene ; Ocean Drilling Program ; oceanic circulation ; paleoceanography ; paleoclimate ; paleocurrent ; Atlantic Ocean ; Atlantic Ocean (North)
英文摘要: North Atlantic Deep Water (NADW) currently redistributes heat and salt between Earth's ocean basins, and plays a vital role in the ocean-atmosphere CO2 exchange. Despite its crucial role in today's climate system, vigorous debate remains as to when deep-water formation in the North Atlantic started. Here, we present datasets from carbonate-rich middle Eocene sediments from the Newfoundland Ridge, revealing a unique archive of paleoceanographic change from the progressively cooling climate of the middle Eocene. Well-defined lithologic alternations between calcareous ooze and clay-rich intervals occur at the ∼41-kyr beat of axial obliquity. Hence, we identify obliquity as the driver of middle Eocene (43.5–46 Ma) Northern Component Water (NCW, the predecessor of modern NADW) variability. High-resolution benthic foraminiferal δ18O and δ13C suggest that obliquity minima correspond to cold, nutrient-depleted, western North Atlantic deep waters. We thus link stronger NCW formation with obliquity minima. In contrast, during obliquity maxima, Deep Western Boundary Currents were weaker and warmer, while abyssal nutrients were more abundant. These aspects reflect a more sluggish NCW formation. This obliquity-paced paleoceanographic regime is in excellent agreement with results from an Earth system model, in which obliquity minima configurations enhance NCW formation. © 2017 The Authors
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110060
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: MARUM - Center for Marine Environmental Sciences, University of Bremen, Leobener Str. 8, Bremen, 28359, Germany; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bussestr. 24, Bremerhaven, 27570, Germany; ING PAN - Institute of Geological Sciences, Polish Academy of Sciences, Research Center in Kraków, Biogeosystem Modelling Laboratory, Kraków, Poland; Department of Earth & Planetary Science, University of California, Santa Cruz, CA 95064, United States; Department of Earth Sciences, University of California, Riverside, CA 92521, United States; School of Environment, Earth & Ecosystem Sciences, The Open University, Milton Keynes, MK7 6AA, United Kingdom

Recommended Citation:
Vahlenkamp M.,Niezgodzki I.,De Vleeschouwer D.,et al. Astronomically paced changes in deep-water circulation in the western North Atlantic during the middle Eocene[J]. Earth and Planetary Science Letters,2018-01-01,484
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