Journal of Korean Society for Atmospheric Environment

한국대기환경학회 (Korean Society for Atmospheric Environment)
권호 표지

Assessment of the Nitrate Radical Chemistry and Chemical Composition on Jeju Island during the Asian Pollution Period in the Spring of 2001

  • Shon, Zang-Ho (Dept. of Environmental Engineering, Dong-Eui University) ;
  • Kim, Ki-Hyun (Dept. of Earth & Environmental Sciences, Sejong University) ;
  • Keith N. Bower (Physics Dept., UMIST, United Kingdom) ;
  • Lee, Gangwoong (Dept. of Environmental Sciences, Hankook University of Foreign Studies) ;
  • Kim, Jiyoung (Meterological Research Institute)
  • 발행 : 2003.09.01
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초록

In this study, we examined the influence of long-range transport of dust particles and air pollutants on the photochemistry of NO$_3$on Jeju Island, Korea (33.17 N, 126.10$^{\circ}$E) during the Asian Dust-Storm (ADS) period of April 2001. Three ADS events were observed during the periods of 10∼12, 13∼14, and 25∼26 April. Average concentration level of nighttime NO$_3$on Jeju Island during the ADS period was estimated to be about 2 x 10$^{8}$ molecules cm$^{-3}$ ( - 9 pptv). Decreases in NO$_3$levels during the ADS period was likely to be determined mainly by the enhancement of the $N_2$O$_{5}$ heterogeneous reaction on dust aerosol surfaces. The reaction of N20s on aerosol surfaces was a more important sink for nighttime N03 during the ADS due to the significant loading of dust particles. The reaction of $N_2$O$_{5}$ with NMHCs and the gas-phase reaction of N20s with water vapor were both significant loss mechanisms during the study period, especially during the NADS. However, dry deposition of these oxidized nitrogen species and a heterogeneous reaction of NO$_3$were of no importance. Short-term observations of $O_3$, NO$_2$, DMS, and SO$_2$in the MBL indicated that concentrations of most of these chemical species were different between the ADS and non - Asian - Dust-Storm (NADS) periods, implying that their levels were affected sensitively by the differences in air mass trajectories.

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