气候变化领域集成服务门户(CCPortal): Decoupling Natural and Anthropogenic Mercury and Lead Transport from South Asia to the Himalayas

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DOI	10.1021/acs.est.0c00429
	Decoupling Natural and Anthropogenic Mercury and Lead Transport from South Asia to the Himalayas
	Huang J.; Kang S.; Yin R.; Lin M.; Guo J.; Ram K.; Li C.; Sharma C.; Tripathee L.; Sun S.; Wang F.
发表日期	2020
ISSN	1009637X
起始页码	5429
结束页码	5436
卷号	54 期号:9
英文摘要	Mercury (Hg) and lead (Pb) accumulation since the Industrial Revolution has been generally observed to increase concurrently in lake sedimentary records around the world. Located downwind during the monsoon season from the rapidly developing South Asia, the Himalayas and the Tibetan Plateau are expected to receive direct anthropogenic Hg and Pb loadings, yet the source, pathway, and effects of such transport remain poorly known due to logistic challenges in accessing this region. When studying the sediment record from Lake Gokyo (4750 m above sea level (a.s.l.)) in the Himalayas, we find remarkably different Hg and Pb accumulation trends over the past 260 years. Although Hg accumulation has continued to increase since the Industrial Revolution, Pb accumulation peaked during that time and has been decreasing since then. Stable isotope analysis reveals that the decoupling trends between these two elements are due to different sources and pathways of Hg and Pb in the region. Both δ202Hg and Δ199Hg have been increasing since the Industrial Revolution, suggesting that anthropogenic Hg emissions from South Asia have been continuously increasing and that the Indian monsoon-driven wet deposition of atmospheric Hg is the dominant pathway for Hg accumulation in the sediments. In contrast, analysis of 206Pb/207Pb and 208Pb/207Pb ratios suggests that Pb accumulation in the sediments originates primarily from natural sources and that the decreasing trend of Pb accumulation is most likely due to a weakening input of atmospheric mineral dust by the westerlies. These decoupling trends highlight the ongoing issue of transboundary Hg transport to the Himalayas and the Tibetan Plateau that are source waters for major freshwater systems in Asia and calls for regional and international collaborations on Hg emission controls in South Asia. Copyright © 2020 American Chemical Society.
语种	英语
scopus关键词	Environmental Science and Technology
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158443
作者单位	Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; CAS, Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China; State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China; State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; Institute of Environment and Sustainable Development, Banaras Hindu University, Varanasi, 221005, India; Central Department of Environmental Science, Tribhuvan University, Kathmandu, 6133, Nepal; University of the Chinese Academy of Sciences, Beijing, 100049, China; Centre for Earth Observation Science, Department of ...
推荐引用方式 GB/T 7714	Huang J.,Kang S.,Yin R.,et al. Decoupling Natural and Anthropogenic Mercury and Lead Transport from South Asia to the Himalayas[J]. 中国科学院西北生态环境资源研究院,2020,54(9).
APA	Huang J..,Kang S..,Yin R..,Lin M..,Guo J..,...&Wang F..(2020).Decoupling Natural and Anthropogenic Mercury and Lead Transport from South Asia to the Himalayas.,54(9).
MLA	Huang J.,et al."Decoupling Natural and Anthropogenic Mercury and Lead Transport from South Asia to the Himalayas".54.9(2020).