1Earth Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH, USA
2Department of Chemistry, University of New Hampshire, Durham, NH, USA
3Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA
4Department of Chemistry, SUNY College of Environmental Science and Forestry, Syracuse, NY, USA
5Department of Chemistry, Appalachian State University, Boone, NC, USA
Abstract. A study was conducted to determine the size distribution of particulate mercury (HgP) at a marine and coastal site, and compare the seasonality at both sites. Data was collected during summer 2009 and 2010, winter 2010, and spring 2010. Two cascade impactors were used to collect HgP in ten size fractions ranging from >10 μm to <0.4 μm. During summer 2009, HgP was found mainly (50–60%) in coarse fractions, 1.1 to 5.8 μm, composed of sea salt particles at both our coastal site (Thompson Farm) and marine site (Appledore Island). In winter, HgP at Thompson Farm was dominated (65%) by fine particles, while in spring and summer 2010, at both sites, HgP was distributed across the coarse and fine fractions (40% each). Using bulk filters to collect total HgP during each campaign, we show a diurnal cycle that matches that of gaseous elemental mercury. Finally, dry deposition rates of HgP were calculated to be 1.7–2.8 ng m−2 day−1 in the summer, 4.6 ng m−2 day−1 in the winter, and 2.5 ng m−2 day−1 in the spring.