气候变化领域集成服务门户(CCPortal): Nitrogen isotopes in ice core nitrate linked to anthropogenic atmospheric acidity change

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DOI	10.1073/pnas.1319441111
	Nitrogen isotopes in ice core nitrate linked to anthropogenic atmospheric acidity change
	Geng L.; Alexander B.; Cole-Dai J.; Steig E.J.; Savarino J.; Sofen E.D.; Schauer A.J.
发表日期	2014
ISSN	0027-8424
起始页码	5808
结束页码	5812
卷号	111 期号:16
英文摘要	Nitrogen stable isotope ratio (δ15N) in Greenland snow nitrate and in North American remote lake sediments has decreased gradually beginning as early as ∼1850 Christian Era. This decrease was attributed to increasing atmospheric deposition of anthropogenic nitrate, reflecting an anthropogenic impact on the global nitrogen cycle, and the impact was thought to be amplified ∼1970. However, our subannually resolved ice core records of δ15N and major ions (e.g., NO3-, SO 42-) over the last ∼200 y show that the decrease in δ15N is not always associated with increasing NO 3- concentrations, and the decreasing trend actually leveled off ∼1970. Correlation of δ15N with H+, NO3-, and HNO3 concentrations, combined with nitrogen isotope fractionation models, suggests that the δ15N decrease from ∼1850-1970 was mainly caused by an anthropogenic-driven increase in atmospheric acidity through alteration of the gas-particle partitioning of atmospheric nitrate. The concentrations of NO3 - and SO42- also leveled off ∼1970, reflecting the effect of air pollution mitigation strategies in North America on anthropogenic NOx and SO2 emissions. The consequent atmospheric acidity change, as reflected in the ice core record of H+ concentrations, is likely responsible for the leveling off of δ15N ∼1970, which, together with the leveling off of NO3- concentrations, suggests a regionalmitigation of anthropogenic impact on the nitrogen cycle. Our results highlight the importance of atmospheric processes in controlling δ15N of nitrate and should be considered when using δ15N as a source indicator to study atmospheric flux of nitrate to land surface/ecosystems.
英文关键词	Acid deposition; Clean air act; Fossil fuel emissions; Industrial; Proxy
语种	英语
scopus关键词	isotope; nitrate; nitric acid; nitrogen; nitrogen oxide; snow; sulfate; aerosol; air pollution; article; atmosphere; atmospheric acidity; atmospheric deposition; ecosystem; Greenland; ice core record; nitrogen cycle; nitrogen partitioning; North America; photolysis; priority journal; acid deposition; clean air act; fossil fuel emissions; industrial; proxy; Acids; Atmosphere; Greenland; Human Activities; Humans; Ice; Nitrates; Nitric Acid; Nitrogen Isotopes; Protons; Sulfates
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/158987
作者单位	Geng, L., Department of Atmospheric Sciences and Earth, University of Washington, Seattle, WA 98195, United States; Alexander, B., Department of Space Sciences, University of Washington, Seattle, WA 98195, United States; Cole-Dai, J., Department of Chemistry and Biochemistry, South Dakota State University, Brookings, SD 57007, United States; Steig, E.J., Department of Space Sciences, University of Washington, Seattle, WA 98195, United States; Savarino, J., Université de Grenoble Alpes, F-38000 Grenoble, France, Centre National de la Recherche Scientifique, Laboratoire de Glaciologie et Géophysique de l' Environnement, F-38000 Grenoble, France; Sofen, E.D., Department of Atmospheric Sciences and Earth, University of Washington, Seattle, WA 98195, United States; Schauer, A.J., Department of Space Sciences, University of Washington, Seattle, WA 98195, United States
推荐引用方式 GB/T 7714	Geng L.,Alexander B.,Cole-Dai J.,et al. Nitrogen isotopes in ice core nitrate linked to anthropogenic atmospheric acidity change[J],2014,111(16).
APA	Geng L..,Alexander B..,Cole-Dai J..,Steig E.J..,Savarino J..,...&Schauer A.J..(2014).Nitrogen isotopes in ice core nitrate linked to anthropogenic atmospheric acidity change.Proceedings of the National Academy of Sciences of the United States of America,111(16).
MLA	Geng L.,et al."Nitrogen isotopes in ice core nitrate linked to anthropogenic atmospheric acidity change".Proceedings of the National Academy of Sciences of the United States of America 111.16(2014).