Abstract:A quantitative single particle analytical technique, low-Z particle electron probe X-ray microanalysis (EPMA) was used to characterize 2821 individual particles in 16 sets of aerosol samples collected on July 25~31, 2007 at Ny-?lesund, Svalbard (78?55′N, 11?56′E) and 1460 individual particles in 5 sets of aerosol samples collected on March 12~16, 2009 at King George Island (62?13′S, 58?47′W). There was great difference in chemical compositions between the atmospheric particles of the two sites. For the Arctic samples, aged sea salt, fresh (or genuine) sea salt, and mineral dust particles accounted for 44%, 9%, and 27%, respectively, in the examined particles (their aerodynamic diameters were in the range of 0.5~8μm). Whereas for the Antarctic samples, fresh sea salt particles accounted for 74% and aged sea salt particles containing sulfate accounted for 19% in the examined particles (their aerodynamic diameters were in the range of 1~10μm). The majority of aged sea salt particles at Ny-?lesund contained nitrate, indicating that the atmosphere was disturbed by anthropogenic air pollutants. On the contrary, all of the aged sea salt particles contained sulfate in the samples at King George Island, none of them containing nitrate. It was likely that the oxidation of dimethylsulfide (DMS) emitted from phytoplanktons in the ocean rather than anthropogenic sulfur emission was responsible for the formation of sulfate-containing aged sea salt particles, implying that the air in the Antarctic area was relatively clean, without being polluted by anthropogenic pollutants.
耿红, 李屹, 张志敏, 卢铁彦. 南北极大气气溶胶单颗粒成分特点研究[J]. 中国环境科学, 2012, 32(8): 1361-1367.
GENG Hong, LI Yi, ZHANG Zhi-Min, LU Tie-Yan. Analysis of chemical compositions of individual atmospheric aerosol collected in Arctic and Antarctic area. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(8): 1361-1367.