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The size fractionated atmospheric aerosols have been collected at Gosan site of Jeju Island during 2010~2011, and then their characteristics of acidification and neutralization have been investigated. The anthropogenic NH4 + and nss-SO4 2− showed high concentrations mostly at ultra-fine particle mode of 0.7~1.1 μm, but they also had a bimodal distribution showing high concentrations at coarse particle mode of 4.7~5.8 μm during Asian Dust periods. The concentrations of nss-Ca and NO3 − were relatively high at coarse particle mode of 3.3~4.7 μm, especially NO3 − showed high concentrations with a bimodal pattern at both fine and coarse particle modes. The acidification of atmospheric aerosols at Gosan area was contributed mostly by inorganic sulfuric and nitric acids, while the contribution by organic formic and acetic acids was only 1.6~6.4%. Furthermore, the neutralization of acidic species among atmospheric aerosols was performed mostly by NH3, CaCO3 and MgCO3, especially the neutralization by NH3 was high in fine particle mode, while that by CaCO3 was relatively high in coarse particle mode.  :   2010~2011        .   NH4  nss-SO4   0.7~1.1 μm     ,   4.7~5.8 μm                 . nss-Ca NO3 − 3.3~4.7 μm    ,  NO3 −        .           ,     1.6~6.4%     .  , ,           ,                ,         .

Acidification and neutralization characteristics of size-fractionated atmospheric aerosols at Gosan site of Jeju Isalnd