Atmospheric trace metals （Cu, Zn, Cd, Pb, Fe, V, and Cr）, As, A1 and Na in marine aerosols were studied over the Southern Ocean during the 28th Chinese National Antarctic Research Expedition. Fe was the most abundant of the analyzed trace metals, with an average concentration of 28.824 ng.m3. V and Zn concentrations were also high, and their average concentrations were 5.541 ng.m^3 and 2.584 ng.m^-3, respectively. Although sea spray significantly influenced the marine aerosol particles measured （Na had the highest concentrations of the analyzed elements, with an average concentration of 2.65 μg.m^-3）, multivariate analyses （enrichment factor and principal components analysis） indicated that most of the elements were not associated with oceanic sources. Over the Southern Ocean, Fe, Cd, As, AI and Cr in the aerosols mainly originated from crustal sources, while Cu, Pb, V and Zn originated from crustal sources and anthropogenic emissions. The enrichment factors （EFcrust） for most elements （Fe, Al, As, Cr, Cd, Cu and V） were much lower in the northern latitudes, indicating that when the sampling occurred closer to land the concentrations of these elements in aerosols were strongly affected by terrestrial crustal sources.
Observations of atmospheric methane-sulfonic acid（MSA） and non-sea-salt sulfate（nss-SO4^2-） from December 2010 to November 2011 at Zhongshan Station are presented in this paper. MSA and nss-SO4^2- average concentrations were 24.2 ± 37.9 ng·m^-3（0.5-158.3 ng·m^-3） and 53.0 ± 82.6 ng·m^-3（not detected [n.d.]） - 395.4 ng·m^-3）, respectively. Strong seasonal variations of MSA and nss-SO4^2-, with maxima in austral summer and minima in winter, were examined. The high concentrations of sulfur compounds in December may be attributed the dimethyl sulfide（DMS） emissions from the marginal ice zone, when open water near the sampling site was important in impacting the sulfur species of January and February at Zhongshan Station. In austral winter, there was almost no phytoplanktonic activity in offshore waters, and atmospheric sulfur compounds likely had long-range transport sources.
