Abstract
determined. The reliability of the analytical data was verified by the comparison of ion balances, electric conductivities and acid fractions; all of their correlation coefficients were above 0.94. Ionic strengths lower than 10 -4 M were found in 53% of the 1100 Site samples and 28% of the Jeju city samples. Compared with other inland areas, the wet deposition of Na + , Cl - and Mg 2+ was relatively larger, but that of NH 4 + , nss-SO4 2(non-sea salt sulfate) and NO 3 - was lower. Especially the wet deposition increase of Ca 2+ in the spring season supports the possibility of the Asian Dust effect. The acidification of precipitation was caused mostly by SO 4 2and NO3 - in the Jeju area, and the organic acids have contributed only about 7% to the acidity. The neutralization factors by NH 3 were 0.47 and 0.48, and that of CaCO 3 was 0.31 and 0.25 at the 1100 Site and Jeju city, respectively. Investigation into major influencing sources on precipitation components by factor analysis showed that the precipitation at the 1100 Site had been influenced mostly by an anthropogenic source, followed by soil and seawater sources. The precipitation at Jeju city was mainly influenced by oceanic sources, followed by anthropogenic and soil sources.
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