CONCENTRATION CHANGES OF MSA AND MAJOR IONS IN ARCTIC AEROSOLS DURING POLAR SUNRISE

Aerosol samples were collected at Alert, Canada during the polar sunrise period. Major soluble species and MSA were determined by an ion chromatograph. Correlation coefficients among the concentrations of Na^+, Mg^, K^+ and Cl^- are high. The ratios of Mg^/Na^+ in the winter samples are higher than that found in sea water. A part of K^+ and Mg^ in winter aerosols consists of wind-blown dust. The predominant source of Na^+ and Cl^- in Arctic aerosols is considered to be sea salt, but quantity loss of Cl^- is observed around April. Reactions between sea salt and nssSO^_4 would produce particles and liberate HCl gas. The concentration of MSA has two peaks, in spring and summer. Chemical elements of Arctic aerosols are classified into three groups. The dissimilarity is larger from MSA to the others