气候变化领域集成服务门户(CCPortal): Speciated atmospheric mercury during haze and non-haze periods in winter at an urban site in Beijing, China: Pollution characteristics, sources, and causes analyses

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DOI	10.1016/j.atmosres.2020.105209
	Speciated atmospheric mercury during haze and non-haze periods in winter at an urban site in Beijing, China: Pollution characteristics, sources, and causes analyses
	Wang C.; Wang Z.; Zhang X.
发表日期	2021
ISSN	0169-8095
卷号	247
英文摘要	Speciated atmospheric mercury (Hg) was measured at an urban site in Beijing, China from February to March 2018. The mean concentrations of gaseous elemental Hg (GEM), gaseous oxidized Hg (GOM), and fine particulate bound mercury (PBM2.5) were 2.81 ± 0.90 ng m−3, 10.7 ± 8.5 pg m−3, and 60.6 ± 43.5 pg m−3, respectively. Reactive Hg (i.e., RM=GOM+PBM2.5) only represented ~2.4% of total atmospheric Hg. The GEM concentration at the monitoring site was 1.7 times higher than the average value in the Northern Hemisphere. In particular, the mean GEM and PBM2.5 concentrations were significantly higher during haze period (hourly average AQI value > 100 for at least consecutive 24 h) (3.65 ± 0.76 ng m−3 and 93.0 ± 37.1 pg m−3) than during non-haze period (2.42 ± 0.73 ng m−3 and 48.5 ± 39.5 pg m−3). One possible explanation is the strong subsidence of air masses during haze period could lead to the accumulation of air pollutants. However, there was no significant difference in GOM concentration between haze and non-haze periods. Although the ozone, relative humidity (RH), and planetary boundary layer (PBL) all followed a clear diurnal cycle, while for RM no distinct diurnal pattern was observed. Additionally, GEM was significantly positively correlated with CO, indicating that they had homogeneous sources; whereas, they were all negatively correlated with wind speed and PBL height. Based on the combination of potential source contribution function and clustering analyses, we found that high atmospheric Hg events during haze days were more likely caused by the domestic sources in the Circum-Bohai-Sea region, while the transboundary transport of the clean air masses originating from Siberia was attributed to the low GEM and PBM2.5 levels during non-haze days. © 2020 Elsevier B.V.
英文关键词	Circum-Bohai-Sea region; Fine particulate bound mercury; Gaseous elemental mercury; Gaseous oxidized mercury; Potential sources regions; Trace gases
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/236925
作者单位	State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing, 100085, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
推荐引用方式 GB/T 7714	Wang C.,Wang Z.,Zhang X.. Speciated atmospheric mercury during haze and non-haze periods in winter at an urban site in Beijing, China: Pollution characteristics, sources, and causes analyses[J],2021,247.
APA	Wang C.,Wang Z.,&Zhang X..(2021).Speciated atmospheric mercury during haze and non-haze periods in winter at an urban site in Beijing, China: Pollution characteristics, sources, and causes analyses.Atmospheric Research,247.
MLA	Wang C.,et al."Speciated atmospheric mercury during haze and non-haze periods in winter at an urban site in Beijing, China: Pollution characteristics, sources, and causes analyses".Atmospheric Research 247(2021).