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

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Department of Chemistry, State University of New York College of Environmental Science and Forestry, Syracuse, NY 13210, USA
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Department of Earth & Atmospheric Sciences, University of Houston, Houston, TX 77204, USA
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Institute for Climate and Global Change Research, Nanjing University, Nanjing 210093, China
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School of Atmospheric Sciences, Nanjing University, Nanjing 210093, China
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Department of Civil Engineering, Lamar University, Beaumont, TX 77710, USA
*
Author to whom correspondence should be addressed.
Atmosphere 2014, 5(1), 124-155; https://doi.org/10.3390/atmos5010124
Received: 28 December 2013 / Revised: 5 February 2014 / Accepted: 10 February 2014 / Published: 17 March 2014
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. View Full-Text
Keywords: Total Gaseous Mercury; China; ASGM; background concentrations Total Gaseous Mercury; China; ASGM; background concentrations
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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.

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