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Chemical Composition Characteristics of Atmospheric Aerosols in Relation to Haze, Asian Dust and Mixed Haze-Asian Dust Episodes at Gosan Site in 2013

2013년 고산지역 연무, 황사, 연무-황사혼재 대기 에어로졸의 화학조성 특성

  • Received : 2016.03.22
  • Accepted : 2016.06.02
  • Published : 2016.06.30

Abstract

The $PM_{10}$ and $PM_{2.5}$ aerosols were collected at the Gosan site of Jeju Island in 2013 and analyzed, in order to examine the variation characteristics of the chemical compositions in relation to the haze, Asian dust, and mixed haze-Asian dust episodes. Volume concentrations obtained from the Aerodynamic Particle Sizer (APS) were high in the range of $0.6{\sim}1.0{\mu}m$ particles for haze event, and in the range of $2.0{\sim}10.0{\mu}m$ particles for Asian dust event. For the haze event, nitrate concentrations increased highly as 8.8 and 25.1 times for $PM_{10}$ and $PM_{2.5}$, respectively, possibly caused by the inflow of air mass stagnated in eastern parts of China into Jeju area. For the Asian dust event, the concentrations of nss-$Ca^{2+}$, $NO_3{^-}$ and nss-$SO_4{^{2-}}$ increased 6.0, 1.5, 1.8 times for $PM_{10}$, and 2.3, 1.3, 1.6 times for $PM_{2.5}$, respectively. Meanwhile, for the mixed haze-Asian dust event, the concentrations of nss-$Ca^{2+}$ and $NO_3{^-}$ increased 13.4 and 3.2 times for $PM_{10}$, and 1.8 and 3.4 times for $PM_{2.5}$, respectively. The $NH_4NO_3$ content was higher than that of $(NH_4)_2SO_4$ during the haze event, however it was relatively low during the mixed haze-Asian dust event. The aerosols were acidified mostly by inorganic acids, and especially the nitric acid contributed highly to the acidification during both the haze and the mixed haze-Asian dust events. Meanwhile, the neutralization by ammonia was noticeably high during haze event when the stagnated air mass moved from China.

Keywords

Haze;Asian dust;$PM_{10}$;$PM_{2.5}$;Secondary inorganic aerosol

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Acknowledgement

Supported by : 국립기상과학원, 한국연구재단