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| Level and transport characteristic of gaseous elemental mercury at a background mountain site of East China |
| LIU Xin-dong1, LIU Ming2, ZHANG Ruo-yu1, CHEN Lai-guo2, ZHAO Wei2, GAO Bo2 |
1. Atmospheric Environment Background Monitoring Station in Wuyishan of Fujian Province, Wuyishan 354302, China;
2. State Environmental Protection Key Laboratory of Urban Ecological Environment Simulation and Protection, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510535, China |
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Abstract Gaseous elemental mercury (GEM) was monitored continuously at Wuyi Mountain using the high-resolution automatic atmospheric mercury vapor analyzer (Tekran 2537B) from June 2017 to May 2018. The annual mean concentration of GEM was (1.70±0.43)ng/m3, slightly higher than background level in the northern hemisphere, suggesting that the atmosphere of the Wuyi Mountain was polluted to some extent. The GEM varied in different seasons, with the highest concentration observed in winter, followed by fall, spring, and summer. The monsoon and wind speed contributed mostly to the seasonal variation. Different diurnal variation characteristics of GEM were found in four seasons. In spring and autumn, GEM continued to decrease after 8:00am, however, in other seasons, GEM showed "increase-decrease-increase" and peaked at different times in nighttime. The GEM in the daytime were generally higher than those in the nighttime, which may related to the wind speed and long distance transport of mercury. Backward trajectory and concentration-weighted trajectory indicated that polluted air masses to the Wuyi Mountain via Jiangxi province under westerly wind was the main path of atmospheric mercury migration. In addition, Jiangxi province and north-central Fujian province were the potential source areas of GEM at the Wuyi Mountain. The values of △GEM/△CO suggested that mercury pollution at the Wuyi Mountain was mainly affected by anthropogenic mercury emissions, while biomass burning did little contribution.
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Received: 14 December 2018
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