气候变化领域集成服务门户(CCPortal): Anthropogenic lead pervasive in Canadian Arctic seawater

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DOI	10.1073/pnas.2100023118
	Anthropogenic lead pervasive in Canadian Arctic seawater
	de Vera J.; Chandan P.; Pinedo-González P.; John S.G.; Jackson S.L.; Cullen J.T.; Colombo M.; Orians K.J.; Bergquist B.A.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:24
英文摘要	Anthropogenic Pb is widespread in the environment including remote places. However, its presence in Canadian Arctic seawater is thought to be negligible based on low dissolved Pb (dPb) concentrations and proxy data. Here, we measured dPb isotopes in Arctic seawater with very low dPb concentrations (average ∼5 pmol · kg−1) and show that anthropogenic Pb is pervasive and often dominant in the western Arctic Ocean. Pb isotopes further reveal that historic aerosol Pb from Europe and Russia (Eurasia) deposited to the Arctic during the 20th century, and subsequently remobilized, is a significant source of dPb, particularly in water layers with relatively higher dPb concentrations (up to 16 pmol · kg−1). The 20th century Eurasian Pb is present predominantly in the upper 1,000 m near the shelf but is also detected in older deep water (2,000 to 2,500 m). These findings highlight the importance of the remobilization of anthropogenic Pb associated with previously deposited aerosols, especially those that were emitted during the peak of Pb emissions in the 20th century. This remobilization might be further enhanced because of accelerated melting of permafrost and ice along with increased coastal erosion in the Arctic. Additionally, the detection of 20th century Eurasian Pb in deep water helps constrain ventilation ages. Overall, this study shows that Pb isotopes in Arctic seawater are useful as a gauge of changing particulate and contaminant sources, such as those resulting from increased remobilization (e.g., coastal erosion) and potentially also those associated with increased human activities (e.g., mining and shipping). © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Anthropogenic lead; Arctic Ocean; Canada Basin; Dissolved lead; Lead isotopes
语种	英语
scopus关键词	isotope; lead; sea water; aerosol; Arctic Ocean; Article; Canadian; concentration (parameter); human; permafrost
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/238521
作者单位	Department of Earth Sciences, University of Toronto, Toronto, ON M5S 3B1, Canada; Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, United States; School of Earth and Ocean Sciences, University of Victoria, Victoria, BC V8P 5C2, Canada; Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia; Department of Earth, Ocean, and Atmospheric Sciences, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
推荐引用方式 GB/T 7714	de Vera J.,Chandan P.,Pinedo-González P.,et al. Anthropogenic lead pervasive in Canadian Arctic seawater[J],2021,118(24).
APA	de Vera J..,Chandan P..,Pinedo-González P..,John S.G..,Jackson S.L..,...&Bergquist B.A..(2021).Anthropogenic lead pervasive in Canadian Arctic seawater.Proceedings of the National Academy of Sciences of the United States of America,118(24).
MLA	de Vera J.,et al."Anthropogenic lead pervasive in Canadian Arctic seawater".Proceedings of the National Academy of Sciences of the United States of America 118.24(2021).