globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1701315114
论文题名:
Impact of glacial/interglacial sea level change on the ocean nitrogen cycle
作者: 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.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2017
卷: 114, 期:33
起始页码: E6759
结束页码: E6766
语种: 英语
英文关键词: Denitrification ; Glacial cycles ; Nitrogen fixation ; Nitrogen isotopes
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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163807
Appears in Collections:气候变化与战略

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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 Hochschule Zürich, Zurich, 8092, Switzerland

Recommended Citation:
Ren H.,Sigman D.M.,Martínez-García A.,et al. Impact of glacial/interglacial sea level change on the ocean nitrogen cycle[J]. Proceedings of the National Academy of Sciences of the United States of America,2017-01-01,114(33)
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