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

제주도 고산지역 대기 에어로졸의 입경별 산성화-중화 특성

  • Received : 2015.01.12
  • Accepted : 2015.02.03
  • Published : 2015.02.25

Abstract

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 $NH_4{^+}$ and nss-$SO_4{^{2-}}$ showed high concentrations mostly at ultra-fine particle mode of $0.7{\sim}1.1{\mu}m$, but they also had a bimodal distribution showing high concentrations at coarse particle mode of $4.7{\sim}5.8{\mu}m$ during Asian Dust periods. The concentrations of nss-$Ca^{2+}$ and $NO_3{^-}$ were relatively high at coarse particle mode of $3.3{\sim}4.7{\mu}m$, especially $NO_3{^-}$ 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 $NH_3$, $CaCO_3$ and $MgCO_3$, especially the neutralization by $NH_3$ was high in fine particle mode, while that by $CaCO_3$ was relatively high in coarse particle mode.

Keywords

size-fractionated aerosols;ionic species;acidification;neutralization;Gosan site

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Acknowledgement

Supported by : 제주대학교