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Atmosphere 2014, 5(1), 124-155; doi:10.3390/atmos5010124
Article

Sources and Dynamic Processes Controlling Background and Peak Concentrations of TGM in Nanjing, China

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Received: 28 December 2013; in revised form: 5 February 2014 / Accepted: 10 February 2014 / Published: 17 March 2014
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Abstract: Total gaseous mercury (TGM) data from urban Nanjing, at the western edge of the Yangtze River Delta (YRD) region in China, over nine months, were analyzed for peak and background mercury concentrations. The background concentration of TGM was found to be 2.2 ng∙m−3. In examining episodic influences of free tropospheric air masses on the surface TGM concentrations in Nanjing, we hypothesize heterogeneity in the global distribution of TGM concentrations in the free troposphere. The nine-month averaged diurnal cycles of TGM indicate a strong co-emission with SO2 and an underestimation of greater than 80% TGM emissions in current inventories. Regular peak concentrations of mercury were investigated and the major causes were YRD emissions, transport from rural areas, and monsoonal transport. Transport of rural emissions is hypothesized to be from illegal artisanal small-scale gold mining that are currently missing in the emission inventories. Enhancement of TGM associated with summer monsoon contributed to a maximum TGM concentration in mid-May–early June, an inverse seasonality in comparison to most other observations in China, North America, and Europe.
Keywords: Total Gaseous Mercury; China; ASGM; background concentrations Total Gaseous Mercury; China; ASGM; background concentrations
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Hall, C.B.; Mao, H.; Ye, Z.; Talbot, R.; Ding, A.; Zhang, Y.; Zhu, J.; Wang, T.; Lin, C.-J.; Fu, C.; Yang, X. Sources and Dynamic Processes Controlling Background and Peak Concentrations of TGM in Nanjing, China. Atmosphere 2014, 5, 124-155.

AMA Style

Hall CB, Mao H, Ye Z, Talbot R, Ding A, Zhang Y, Zhu J, Wang T, Lin C-J, Fu C, Yang X. Sources and Dynamic Processes Controlling Background and Peak Concentrations of TGM in Nanjing, China. Atmosphere. 2014; 5(1):124-155.

Chicago/Turabian Style

Hall, Casey B.; Mao, Huiting; Ye, Zhuyun; Talbot, Robert; Ding, Aijun; Zhang, Yang; Zhu, Jialei; Wang, Tijian; Lin, Che-Jen; Fu, Congbin; Yang, Xiuqun. 2014. "Sources and Dynamic Processes Controlling Background and Peak Concentrations of TGM in Nanjing, China." Atmosphere 5, no. 1: 124-155.


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