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

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.

[1]  A. Ding,et al.  Intense atmospheric pollution modifies weather: a case of mixed biomass burning with fossil fuel combustion pollution in eastern China , 2013 .

[2]  Lei Zhang,et al.  Atmospheric mercury concentration and chemical speciation at a rural site in Beijing, China: implications of mercury emission sources , 2013 .

[3]  P. Tans,et al.  Short-term variations of atmospheric CO2 and dominant causes in summer and winter: Analysis of 14-year continuous observational data at Waliguan, China , 2013 .

[4]  Chung-te Lee,et al.  Distribution of atmospheric mercury in northern Southeast Asia and South China Sea during Dongsha Experiment , 2013 .

[5]  Duo-hong Chen,et al.  Variation trends and influencing factors of total gaseous mercury in the Pearl River Delta—A highly industrialised region in South China influenced by seasonal monsoons , 2013 .

[6]  A. Ding,et al.  Transport characteristics and origins of carbon monoxide and ozone in Hong Kong, South China , 2013 .

[7]  D. Streets,et al.  Legacy impacts of all‐time anthropogenic emissions on the global mercury cycle , 2013 .

[8]  Jiming Hao,et al.  Emission inventory of primary pollutants and chemical speciation in 2010 for the Yangtze River Delta region, China , 2013 .

[9]  S. Hsu,et al.  A unique seasonal pattern in dissolved elemental mercury in the South China Sea, a tropical and monsoon‐dominated marginal sea , 2013 .

[10]  Yong Han,et al.  Characteristics of atmospheric Total Gaseous Mercury (TGM) observed in urban Nanjing, China , 2012 .

[11]  Xinbin Feng,et al.  A review of studies on atmospheric mercury in China. , 2012, The Science of the total environment.

[12]  Qihong Deng,et al.  Characteristics of ventilation coefficient and its impact on urban air pollution , 2012 .

[13]  P. Blanchard,et al.  A comparison of data quality control protocols for atmospheric mercury speciation measurements. , 2012, Journal of environmental monitoring : JEM.

[14]  Junyu Zheng,et al.  Mercury emission inventory and its spatial characteristics in the Pearl River Delta region, China. , 2011, The Science of the total environment.

[15]  Yu Song,et al.  Mercury emissions from biomass burning in China. , 2011, Environmental science & technology.

[16]  Xiaoshan Zhang,et al.  Distribution and air-sea exchange of mercury (Hg) in the Yellow Sea , 2011 .

[17]  Che-Jen Lin,et al.  Empirical models for estimating mercury flux from soils. , 2010, Environmental science & technology.

[18]  R. Ebinghaus,et al.  A review of worldwide atmospheric mercury measurements , 2010 .

[19]  G. Carmichael,et al.  Study of atmospheric mercury budget in East Asia using STEM-Hg modeling system. , 2010, The Science of the total environment.

[20]  Chung-te Lee,et al.  Temporal distribution and potential sources of atmospheric mercury measured at a high-elevation background station in Taiwan , 2010 .

[21]  Simon Wilson,et al.  Global emission of mercury to the atmosphere from anthropogenic sources in 2005 and projections to 2020 , 2010 .

[22]  D. Blake,et al.  Arctic mercury depletion and its quantitative link with halogens , 2010 .

[23]  T. Ho,et al.  Estimating mercury emission outflow from East Asia using CMAQ-Hg , 2010 .

[24]  B. Wiens,et al.  Ambient air total gaseous mercury concentrations in the vicinity of coal-fired power plants in Alberta, Canada. , 2009, The Science of the total environment.

[25]  Noelle E. Selin,et al.  Global Biogeochemical Cycling of Mercury: A Review , 2009 .

[26]  Ki‐Hyun Kim,et al.  A Review of Atmospheric Mercury in the Polar Environment , 2009 .

[27]  Daniel Obrist,et al.  Atmospheric mercury concentrations at Storm Peak Laboratory in the Rocky Mountains: Evidence for long-range transport from Asia, boundary layer contributions, and plant mercury uptake , 2008 .

[28]  J. Dibb,et al.  Total depletion of Hg° in the upper troposphere–lower stratosphere , 2007 .

[29]  H. Mao,et al.  Seasonal and diurnal variations of Hg° over New England , 2007 .

[30]  Zhao Ming,et al.  Soil moisture retrieval from satellite images and its application to heavy rainfall simulation in eastern China , 2006 .

[31]  Lei Shen,et al.  The role of artisanal and small-scale mining in China's economy , 2006 .

[32]  Jiming Hao,et al.  Anthropogenic mercury emissions in China , 2005 .

[33]  Thomas R. Walter,et al.  Feedback processes between magmatic events and flank movement at Mount Etna (Italy) during the 2002-2003 eruption , 2005 .

[34]  J. Chan,et al.  The East Asian summer monsoon: an overview , 2005 .

[35]  A. Takami,et al.  Export of atmospheric mercury from Asia , 2005 .

[36]  H. Mao,et al.  Diurnal characteristics of surface level O3 and other important trace gases in New England , 2005 .

[37]  Yang Wang,et al.  Photochemistry of ozone over the western Pacific from winter to spring , 2004 .

[38]  H. Mao,et al.  O3 and CO in New England: Temporal variations and relationships , 2004 .

[39]  V. Vaida,et al.  Photolysis of Sulfuric Acid Vapor by Visible Solar Radiation , 2003, Science.

[40]  M. Evans,et al.  Seasonal changes in pollutant transport to the North Pacific: The relative importance of Asian and European sources , 2000 .

[41]  I. Folkins,et al.  Mercury Flux Measurements over Air and Water in Kejimkujik National Park, Nova Scotia , 2000 .

[42]  Jia-Yeong Ku,et al.  Spatial and Temporal Variation in the Mixing Depth over the Northeastern United States during the Summer of 1995 , 1999 .

[43]  David S Lee,et al.  Gas-phase mercury in the atmosphere of the United Kingdom , 1998 .

[44]  John Munthe,et al.  Atmospheric mercury—An overview , 1998 .

[45]  R. Draxler.  An Overview of the HYSPLIT_4 Modelling System for Trajectories, Dispersion, and Deposition , 1998 .