气候变化领域集成服务门户(CCPortal): Bistability in the redox chemistry of sediments and oceans

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DOI	10.1073/PNAS.2008235117
	Bistability in the redox chemistry of sediments and oceans
	van de Velde S.J.; Reinhard C.T.; Ridgwell A.; Meysman F.J.R.
发表日期	2021
ISSN	00278424
起始页码	33043
结束页码	33050
卷号	117 期号:52
英文摘要	For most of Earth’s history, the ocean’s interior was pervasively anoxic and showed occasional shifts in ocean redox chemistry between iron-buffered and sulfide-buffered states. These redox transitions are most often explained by large changes in external inputs, such as a strongly altered delivery of iron and sulfate to the ocean, or major shifts in marine productivity. Here, we propose that redox shifts can also arise from small perturbations that are amplified by nonlinear positive feedbacks within the internal iron and sulfur cycling of the ocean. Combining observational evidence with biogeochemical modeling, we show that both sedimentary and aquatic systems display intrinsic iron–sulfur bistability, which is tightly linked to the formation of reduced iron–sulfide minerals. The possibility of tipping points in the redox state of sediments and oceans, which allow large and nonreversible geochemical shifts to arise from relatively small changes in organic carbon input, has important implications for the interpretation of the geological rock record and the causes and consequences of major evolutionary transitions in the history of Earth’s biosphere. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Alternative stable states; Bistability; Redox cycling; Sediments
语种	英语
scopus关键词	iron; organic carbon; sulfide; aquatic environment; Article; biogeochemical cycling; biosphere; iron cycling; mathematical model; oxidation reduction state; positive feedback; priority journal; rock; sea pollution; sediment; sulfur cycle
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/179618
作者单位	Department of Earth and Planetary Sciences, University of California, Riverside, CA 92521, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States; Department of Biology, University of Antwerp, Wilrijk, 2160, Belgium; Department of Biotechnology, Delft University of Technology, Delft, 2629 HZ, Netherlands
推荐引用方式 GB/T 7714	van de Velde S.J.,Reinhard C.T.,Ridgwell A.,et al. Bistability in the redox chemistry of sediments and oceans[J],2021,117(52).
APA	van de Velde S.J.,Reinhard C.T.,Ridgwell A.,&Meysman F.J.R..(2021).Bistability in the redox chemistry of sediments and oceans.Proceedings of the National Academy of Sciences of the United States of America,117(52).
MLA	van de Velde S.J.,et al."Bistability in the redox chemistry of sediments and oceans".Proceedings of the National Academy of Sciences of the United States of America 117.52(2021).