气候变化领域集成服务门户(CCPortal): Latest observations of total gaseous mercury in a megacity (Lanzhou) in northwest China

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DOI	10.1016/j.scitotenv.2020.137494
	Latest observations of total gaseous mercury in a megacity (Lanzhou) in northwest China
	Yin X.; Zhou W.; Kang S.; de Foy B.; Yu Y.; Xie J.; Sun S.; Wu K.; Zhang Q.
发表日期	2020
ISSN	2296701X
卷号	720
英文摘要	One year of online total gaseous mercury (TGM) measurements were carried out for the first time in Lanzhou, a city in northwest China that was once seriously polluted. Measurements were made from October 2016 to October 2017 using the Tekran 2537B instrument, and the annual mean concentration of TGM in Lanzhou was 4.48 ± 2.32 ng m−3 (mean ± standard deviation). TGM concentrations decreased during the measurement period, with autumn 2017 average concentrations 2.87 ng m−3 lower than autumn 2016 average concentrations. Similar diurnal variations of TGM were obtained in different seasons with low concentrations observed in the afternoon and high concentrations at night. The principal component analysis and conditional probability function results revealed that the sources of mercury were similar to the other atmospheric pollutants such as SO2, CO, NO2 and PM2.5, and were mainly from industrial combustion plants in urban districts. Concentration weighted trajectory analysis using backward trajectories demonstrated that higher mercury concentrations were related to air masses from adjacent regions, indicating the importance of influences from local-to-regional scale sources. A synthesis of multi-decadal atmospheric mercury measurements in Lanzhou and other Chinese megacities revealed that atmospheric mercury concentrations were either generally stable or experienced a slight decrease, during a time when China implemented control measures on atmospheric pollution. Long-term atmospheric mercury observations in urban and background sites in China are warranted to assess mercury pollution and the effectiveness of China's mercury control policies. © 2020 Elsevier B.V.
英文关键词	Observation; Pollution control; Potential sources; Temporal variation; Total gaseous mercury
语种	英语
scopus关键词	Science of the Total Environment
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/158431
作者单位	State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Science, Lanzhou, 730000, China; Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100039, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, 100085, China; Department of Earth and Atmospheric Sciences, Saint Louis University, St. Louis, MO 63108, United States; Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Science, Lanzhou, 730000, China; China Meteorological Administration, National Meteorological Center, Beijing, 100081, China; Institute of International Rivers and Eco-Security, Yunnan University, Kunming, 650091, China
推荐引用方式 GB/T 7714	Yin X.,Zhou W.,Kang S.,et al. Latest observations of total gaseous mercury in a megacity (Lanzhou) in northwest China[J]. 中国科学院西北生态环境资源研究院,2020,720.
APA	Yin X..,Zhou W..,Kang S..,de Foy B..,Yu Y..,...&Zhang Q..(2020).Latest observations of total gaseous mercury in a megacity (Lanzhou) in northwest China.,720.
MLA	Yin X.,et al."Latest observations of total gaseous mercury in a megacity (Lanzhou) in northwest China".720(2020).