Atmospheric mercury and fine particulate matter in coastal New England: Implications for mercury and trace element sources in the northeastern United States

摘要: Abstract Intensive sampling of ambient atmospheric fine particulate matter was conducted at Woods Hole, Massachusetts over a four-month period from 3 April to 29 July, 2008, in conjunction with year-long deployment the USGS Mobile Mercury Lab. Results were obtained for trace elements concurrently determination mercury speciation and concentrations ancillary gasses (SO2, NOx, O3). For matter, element enrichment factors greater than 10 relative crustal background values found As, Bi, Cd, Cu, Hg, Pb, Sb, V, Zn, indicating contribution these by anthropogenic sources. other elements, enrichments are consistent natural marine (Na, Ca, Mg, Sr) or (Ba, Ce, Co, Cs, Fe, Ga, La, Rb, Sc, Th, Ti, U, Y) sources, respectively. Positive matrix factorization used together concentration weighted air-mass back trajectories better define sources their locations. Our analysis, based on events exhibiting 10% highest PM2.5 contributions each source category, identifies coal-fired power stations concentrated U.S. Ohio Valley, metal smelting eastern Canada, showing surprisingly similar trajectories, times Atlantic coastal airsheds. This pattern is Saharan dust summer maximum latitude Florida northward transport up Coast clockwise circulation Bermuda High. show diurnal production RGM photochemical oxidation Hg° environment, periodic traverse study area correlated RGM-SO2(NOx) plumes, indicative coal combustion