气候变化领域集成服务门户(CCPortal): Temporal variation and long–range transport of gaseous elemental mercury (GEM) over a coastal site of East China

CCPortal

DOI	10.1016/j.atmosres.2019.104699
	Temporal variation and long–range transport of gaseous elemental mercury (GEM) over a coastal site of East China
	Yi H.; Tong L.; Lin J.-M.; Cai Q.-L.; Wang K.-Q.; Dai X.-R.; Li J.-R.; Chen J.-S.; Xiao H.
发表日期	2020
ISSN	0169-8095
卷号	233
英文摘要	Continuous measurements of gaseous elemental mercury (GEM) play a key role in identifying mercury sources and its behavior in the atmosphere. In order to investigate the characteristics of GEM during the year when Minamata Convention on Mercury has entered into force in China, concentrations of GEM along with other pollutants were continuously measured at a coastal site in Ningbo, China. Hourly mean concentration of GEM at the study site ranged from 0.64 to 13.58 ng m−3 and showed an annual mean of 2.44 ± 0.95 ng m−3. The atmospheric GEM showed obvious seasonal variations, with the highest seasonal average concentration in winter (2.62 ± 1.05 ng m−3) and the lowest value in summer (2.26 ± 0.78 ng m−3). The monthly variation of GEM/TGM ratios ranged from 72.6% to 98.0% and clear inverse trends for monthly GEM/TGM and O3 were found during the entire period. Higher O3 concentration promote the photochemical oxidation of GEM into divalent mercury. Additionally, a high GEM episode that lasted >3 days was analyzed, and it showing high correlation with PM2.5 and SO2. The dilution of marine airflow and enhanced oxidation of GEM over sea are important for GEM depletion at the coastal site. Smoothed concentration weighted trajectory (CWT) analysis revealed that the GEM at the study site was mainly impacted by anthropogenic emissions from coastal provinces (Fujian, Jiangsu and Zhejiang) and inland provinces (Jiangxi, Anhui and Hubei). Coordinated inter-regional control on pollutant emissions is essential for the mercury reduction in the study area. © 2019 Elsevier B.V.
英文关键词	Backward trajectory; Concentration weighted trajectory (CWT); GEM; K-means clustering; Temporal variation
学科领域	Gems; K-means clustering; Pollution; Trajectories; Anthropogenic emissions; Average concentration; Backward trajectory; Continuous measurements; Gaseous elemental mercury; Mean concentrations; Photochemical oxidation; Temporal variation; Coastal engineering; atmospheric pollution; cluster analysis; coastal zone; concentration (composition); long range transport; mercury (element); seasonal variation; trajectory; China; Ningbo; Zhejiang
语种	英语
scopus关键词	Gems; K-means clustering; Pollution; Trajectories; Anthropogenic emissions; Average concentration; Backward trajectory; Continuous measurements; Gaseous elemental mercury; Mean concentrations; Photochemical oxidation; Temporal variation; Coastal engineering; atmospheric pollution; cluster analysis; coastal zone; concentration (composition); long range transport; mercury (element); seasonal variation; trajectory; China; Ningbo; Zhejiang
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120555
作者单位	Center for Excellence in Regional Atmospheric Environment & Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Ningbo Urban Environment Observation and Research Station, Chinese Academy of Sciences, Ningbo, 315800, China
推荐引用方式 GB/T 7714	Yi H.,Tong L.,Lin J.-M.,等. Temporal variation and long–range transport of gaseous elemental mercury (GEM) over a coastal site of East China[J],2020,233.
APA	Yi H..,Tong L..,Lin J.-M..,Cai Q.-L..,Wang K.-Q..,...&Xiao H..(2020).Temporal variation and long–range transport of gaseous elemental mercury (GEM) over a coastal site of East China.Atmospheric Research,233.
MLA	Yi H.,et al."Temporal variation and long–range transport of gaseous elemental mercury (GEM) over a coastal site of East China".Atmospheric Research 233(2020).