气候变化领域集成服务门户(CCPortal): From greenhouse to icehouse: Nitrogen biogeochemistry of an epeiric sea in the context of the oxygenation of the Late Devonian atmosphere/ocean system

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DOI	10.1016/j.palaeo.2019.05.026
	From greenhouse to icehouse: Nitrogen biogeochemistry of an epeiric sea in the context of the oxygenation of the Late Devonian atmosphere/ocean system
	Tuite M.L.; Jr; Williford K.H.; Macko S.A.
发表日期	2019
ISSN	0031-0182
起始页码	1
结束页码	13
卷号	531
英文摘要	The Late Devonian emergence of extensive arborescent terrestrial ecosystems produced changes in the Earth's atmosphere and climate that resulted in substantial changes to the biogeochemistry of marine ecosystems. The biogeochemistry of nitrogen in epeiric seas was particularly susceptible to alteration because of its dependence upon the series of redox-mediated reactions that comprise the marine N cycle. In order to explore the impact of climate change on N biogeochemistry in a Late Devonian epeiric sea, we sampled a core from the Appalachian Basin that spans the interval from the greenhouse climate at the base of the Famennian period to glacial conditions near its conclusion. Based upon stable isotope analysis of N, C, and S as well as elemental analysis of N, C, P, S, and Fe, we contend that two distinct biogeochemical regimes obtained during the contrasting climates. The greenhouse regime featured low seawater O2 and pH that served to significantly curtail the oxidation of ammonia – i.e. nitrification – resulting in an ammonium-dominated water column and low sediment δ15N values. The greenhouse also featured more extensive recycling of C, N, and P. In contrast, the higher seawater O2 and pH of the icehouse regime permitted nitrification in the water column resulting in a nitrate-dominated system and higher sediment δ15N values. We conclude that nitrification was the key component of the N cycle that differentiated the two climate/biogeochemical regimes. © 2019
英文关键词	Biogeochemical cycles; Carbon isotopes; Climate; Nitrification; Nitrogen isotopes; Ocean acidification
语种	英语
scopus关键词	air-sea interaction; ammonia; biogeochemistry; carbon isotope; climate conditions; core analysis; emergence; Famennian; greenhouse gas; nitrification; nitrogen isotope; ocean acidification; paleoceanography; redox conditions; Appalachian Basin
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150869
作者单位	Jet Propulsion Laboratory, California Institute of Technology, 4800 Grove Dr., Pasadena, CA 91109, United States; Department of Environmental Sciences, University of Virginia, 291 McCormick Rd., Charlottesville, VA 22903, United States
推荐引用方式 GB/T 7714	Tuite M.L.,Jr,Williford K.H.,et al. From greenhouse to icehouse: Nitrogen biogeochemistry of an epeiric sea in the context of the oxygenation of the Late Devonian atmosphere/ocean system[J],2019,531.
APA	Tuite M.L.,Jr,Williford K.H.,&Macko S.A..(2019).From greenhouse to icehouse: Nitrogen biogeochemistry of an epeiric sea in the context of the oxygenation of the Late Devonian atmosphere/ocean system.Palaeogeography, Palaeoclimatology, Palaeoecology,531.
MLA	Tuite M.L.,et al."From greenhouse to icehouse: Nitrogen biogeochemistry of an epeiric sea in the context of the oxygenation of the Late Devonian atmosphere/ocean system".Palaeogeography, Palaeoclimatology, Palaeoecology 531(2019).