气候变化领域集成服务门户(CCPortal): Nitrogen isotope evidence for expanded ocean suboxia in the early Cenozoic

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DOI	10.1126/science.aau5784
	Nitrogen isotope evidence for expanded ocean suboxia in the early Cenozoic
	Kast E.R.; Stolper D.A.; Auderset A.; Higgins J.A.; Ren H.; Wang X.T.; Martínez-García A.; Haug G.H.; Sigman D.M.
发表日期	2019
ISSN	0036-8075
起始页码	386
结束页码	389
卷号	364 期号:6438
英文摘要	The million-year variability of the marine nitrogen cycle is poorly understood. Before 57 million years (Ma) ago, the 15N/14N ratio (d15N) of foraminifera shell-bound organic matter from three sediment cores was high, indicating expanded water column suboxia and denitrification. Between 57 and 50 Ma ago, d15N declined by 13 to 16 per mil in the North Pacific and by 3 to 8 per mil in the Atlantic.The decline preceded global cooling and appears to have coincided with the early stages of the Asia-India collision.Warm, salty intermediate-depthwater forming along the Tethys Seamargins may have caused the expanded suboxia, ending with the collision. From 50 to 35 Ma ago, d15N was lower than modern values, suggesting widespread sedimentary denitrification on broad continental shelves. d15N rose at 35 Ma ago, as ice sheets grew, sea level fell, and continental shelves narrowed. © 2019 American Association for the Advancement of Science. All rights reserved.
英文关键词	ice; nitrate; nitrogen; nitrogen 15; organic compound; organic matter; nitrogen; oxygen; sea water; Cenozoic; continental shelf; cooling; denitrification; foraminifera; nitrogen cycle; nitrogen isotope; organic matter; sea level change; sediment chemistry; sediment core; suboxic conditions; Article; Asia; Cenozoic; chemical analysis; chemical composition; cooling; denitrification; environmental parameters; environmental temperature; India; nitrogen cycle; nitrogen fixation; nonhuman; ocean environment; Paleocene; priority journal; sediment; tropic climate; anaerobic growth; chemistry; metabolism; sea; Atlantic Ocean; Pacific Ocean; Pacific Ocean (North); Foraminifera; Anaerobiosis; Geologic Sediments; Nitrogen Cycle; Nitrogen Isotopes; Oceans and Seas; Oxygen; Seawater
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/244225
作者单位	Department of Geosciences, Princeton University, Princeton, NJ 08540, United States; Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, United States; Earth and Environmental Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Department of Climate Geochemistry, Max Planck Institute for Chemistry, Mainz, 55128, Germany; Department of Earth Sciences, ETH Zürich, Zürich, CH-8092, Switzerland; Research Center for Future Earth, National Taiwan University, Taipei, 106, Taiwan; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States
推荐引用方式 GB/T 7714	Kast E.R.,Stolper D.A.,Auderset A.,et al. Nitrogen isotope evidence for expanded ocean suboxia in the early Cenozoic[J],2019,364(6438).
APA	Kast E.R..,Stolper D.A..,Auderset A..,Higgins J.A..,Ren H..,...&Sigman D.M..(2019).Nitrogen isotope evidence for expanded ocean suboxia in the early Cenozoic.Science,364(6438).
MLA	Kast E.R.,et al."Nitrogen isotope evidence for expanded ocean suboxia in the early Cenozoic".Science 364.6438(2019).