气候变化领域集成服务门户(CCPortal): Impact of glacial/interglacial sea level change on the ocean nitrogen cycle

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DOI	10.1073/pnas.1701315114
	Impact of glacial/interglacial sea level change on the ocean nitrogen cycle
	Ren H.; Sigman D.M.; Martínez-García A.; Anderson R.F.; Chen M.-T.; Ravelo A.C.; Straub M.; Wong G.T.F.; Haug G.H.
发表日期	2017
ISSN	0027-8424
起始页码	E6759
结束页码	E6766
卷号	114 期号:33
英文摘要	The continental shelves are the most biologically dynamic regions of the ocean, and they are extensive worldwide, especially in the western North Pacific. Their area has varied dramatically over the glacial/interglacial cycles of the last million years, but the effects of this variation on ocean biological and chemical processes remain poorly understood. Conversion of nitrate to N2 by denitrification in sediments accounts for half or more of the removal of biologically available nitrogen (“fixed N”) from the ocean. The emergence of continental shelves during ice ages and their flooding during interglacials have been hypothesized to drive changes in sedimentary denitrification. Denitrification leads to the occurrence of phosphorus-bearing, N-depleted surface waters, which encourages N2 fixation, the dominant N input to the ocean. An 860,000-y record of foraminifera shell-bound N isotopes from the South China Sea indicates that N2 fixation covaried with sea level. The N2 fixation changes are best explained as a response to changes in regional excess phosphorus supply due to sea level-driven variations in shallow sediment denitrification associated with the cyclic drowning and emergence of the continental shelves. This hypothesis is consistent with a glacial ocean that hosted globally lower rates of fixed N input and loss and a longer residence time for oceanic fixed N - a “sluggish” ocean N budget during ice ages. In addition, this work provides a clear sign of sea level-driven glacial/interglacial oscillations in biogeochemical fluxes at and near the ocean margins, with implications for coastal organisms and ecosystems. © 2017, National Academy of Sciences. All rights reserved.
英文关键词	Denitrification; Glacial cycles; Nitrogen fixation; Nitrogen isotopes
语种	英语
scopus关键词	isotope; nitrogen; phosphorus; surface water; Article; chemical reaction; China; continental shelf; controlled study; denitrification; drowning; flooding; foraminifer; glacial period; interglacial; nitrogen cycle; nitrogen fixation; priority journal; sea; sea level; sediment; sedimentation rate
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160604
作者单位	Ren, H., Department of Geosciences, National Taiwan University, Taipei, 106, Taiwan; Sigman, D.M., Department of Geosciences, Princeton University, Princeton, NJ 08544, United States; Martínez-García, A., Max Planck Institute for Chemistry, Mainz, 55128, Germany; Anderson, R.F., Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, United States; Chen, M.-T., Institute of Geosciences, National Taiwan Ocean University, Keelung, 20224, Taiwan; Ravelo, A.C., Ocean Sciences Department, University of California, Santa Cruz, CA 95064, United States; Straub, M., Institute of Radiation Physics, Lausanne University Hospital, Lausanne, 1011, Switzerland; Wong, G.T.F., Research Center for Environmental Changes, Academia Sinica, Taipei, 11529, Taiwan, Department of Ocean, Earth and Atmospheric Sciences, Old Dominion University, Norfolk, VA 23529, United States; Haug, G.H., Max Planck Institute for Chemistry, Mainz, 55128, Germany, Department of Earth Sciences, Eidgenössische Technische Hochs...
推荐引用方式 GB/T 7714	Ren H.,Sigman D.M.,Martínez-García A.,et al. Impact of glacial/interglacial sea level change on the ocean nitrogen cycle[J],2017,114(33).
APA	Ren H..,Sigman D.M..,Martínez-García A..,Anderson R.F..,Chen M.-T..,...&Haug G.H..(2017).Impact of glacial/interglacial sea level change on the ocean nitrogen cycle.Proceedings of the National Academy of Sciences of the United States of America,114(33).
MLA	Ren H.,et al."Impact of glacial/interglacial sea level change on the ocean nitrogen cycle".Proceedings of the National Academy of Sciences of the United States of America 114.33(2017).