Pollution Characteristics and Potential Source Contributions of Gaseous Elemental Mercury (GEM) During Summer and Autumn in Ningbo City

被引：0
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作者：
Yi H. [1 ,2 ,3 ,4 ]
Lin J.-M. [1 ,2 ,3 ,4 ]
Cai Q.-L. [1 ,2 ,3 ,4 ]
Wang K.-Q. [1 ,2 ,3 ,4 ]
Chen J.-S. [1 ,3 ]
Tong L. [1 ,3 ,4 ]
Li J.-R. [1 ,4 ]
Xiao H. [1 ,3 ,4 ]
机构：
[1] Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen
[2] University of Chinese Academy of Sciences, Beijing
[3] Center for Excellence in Regional Atmospheric Environment, Chinese Academy of Sciences, Xiamen
[4] Ningbo Urban Environment Observation and Research Station, Chinese Academy of Sciences, Ningbo
来源：
Huanjing Kexue/Environmental Science | 2020年 / 41卷 / 01期
关键词：
Atmospheric photochemical oxidation; Atmospheric pollutants; Correlation analysis; Gaseous elemental mercury (GEM); Potential source contribution function analysis (PSCF);
D O I：
10.13227/j.hjkx.201906027
中图分类号：
学科分类号：
摘要：
Gaseous elemental mercury (GEM) is commonly known as a hazardous heavy metal in the atmosphere and is harmful to living organisms. GEM is chemically stable and has a long residence time in the atmosphere; hence, it can be transported over long distances with air masses and is regarded as a global pollutant. We study the transportation and transformation mechanisms of GEM and its potential anthropogenic and natural contribution sources. GEM, conventional atmospheric pollutants, and meteorological parameters were monitored at a coastal site in Ningbo during the summer and autumn of 2017. The results were as follows. ① The concentrations of GEM ranged from 0.97-10.95 ng•m-3 and the mean and standard deviation (SD) were (2.32±0.90) ng•m-3, whereby the mean summer concentration was lower than the mean autumn concentration. ② The diurnal variations of GEM, ozone (O3), and gaseous oxidized mercury (GOM) during summer/autumn and sunny/rainy days suggest that higher levels of O3 and that strong solar radiation accounted for the rapid photochemical oxidation of GEM. The intensity of oxidation on sunny days was higher than that on rainy days. ③ Correlation analysis showed that GEM was significantly positively correlated with PM2.5 (R=0.65, P<0.01), PM10 (R=0.47, P<0.01), NO2 (R=0.46, P<0.01), and CO (R=0.57, P<0.01). Local and regional sources of GEM were mainly related to fossil fuel combustion. ④ The photochemical oxidation rate of GEM was influenced by the concentrations of oxidants (e.g., O3), gas-particle partitioning between GEM and particles, and light extinction effects of PM2.5, water vapor, and NO2. ⑤ Potential source contribution analysis (PSCF) indicated that the northwestern Zhejiang Province (including Ningbo City), the southern Anhui Province, and most of Jiangxi Province constitute a triangular area that is a potential source contribution to NBUEORS atmospheric GEM pollution during the summer. Local, regional, and long-range sources all had strong impacts on GEM pollution. During the autumn, the potential sources were mainly in the northern Zhejiang Province, and the source was smaller than that during the summer. GEM pollution during the autumn was mainly influenced by local and regional sources. Therefore, the control of atmospheric GEM pollution in the Yangtze River delta should apply inter-regional prevention and comprehensive control strategies in order to reduce atmospheric mercury pollution. © 2020, Science Press. All right reserved.
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页码：65 / 74
页数：9
相关论文
共 33 条
  • [1] Cheng N, Qian G L, Duan L, Et al., Correlation of speciated mercury with carbonaceous components in atmospheric PM<sub>2.5</sub>in Shengsi region, Environmental Science, 38, 2, pp. 438-444, (2017)
  • [2] Duan L, Wang X H, Wang D F, Et al., Atmospheric mercury speciation in Shanghai, China, Science of the Total Environment, 578, pp. 460-468, (2017)
  • [3] Zhu J, Wang T, Talbot R, Et al., Characteristics of atmospheric total gaseous mercury (TGM) observed in urban Nanjing, China, Atmospheric Chemistry and Physics, 12, 24, pp. 12103-12118, (2012)
  • [4] Mastromonaco M N, Gardfeldt K, Jourdain B, Et al., Antarctic winter mercury and ozone depletion events over sea ice, Atmospheric Environment, 129, pp. 125-132, (2016)
  • [5] Li S, Gao W, Wang S X, Et al., Characteristics of speciated atmospheric mercury in Chongming island, Shanghai, Environmental Science, 37, 9, pp. 3290-3299, (2016)
  • [6] Wang S, Wang H M, Zhu F H, Et al., Mercury emission characteristics from coal-fired power plants based on actual measurement, Environmental Science, 32, 1, pp. 33-37, (2011)
  • [7] Steffen A, Douglas T, Amyot M, Et al., A synthesis of atmospheric mercury depletion event chemistry in the atmosphere and snow, Atmospheric Chemistry and Physics, 8, 6, pp. 1445-1482, (2008)
  • [8] Ci Z J, Zhang X S, Wang Z W, Et al., Atmospheric gaseous elemental mercury (GEM) over a coastal/rural site downwind of East China: temporal variation and long-range transport, Atmospheric Environment, 45, 15, pp. 2480-2487, (2011)
  • [9] pp. 101-102, (2017)
  • [10] Li L, Cai Y L, Zhou M., Potential source contribution analysis of the particulate matters in Shanghai during the heavy haze episode in eastern and middle China in December, 2013, Environmental Science, 36, 7, pp. 2327-2336, (2015)
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