Assessment of the photochemistry of OH and NO3 on Jeju Island during the Asian-dust-storm period in the spring of 2001

Zang Ho Shon, Ki Hyun Kim, Keith N. Bower, Gangwoong Lee, Jiyoung Kim

    Research output: Contribution to journalArticlepeer-review

    Abstract

    In this study, we examined the influence of the long-range transport of dust particles and air pollutants on the photochemistry of OH and NO 3 on Jeju Island, Korea (33.17°N, 126.10°E) during the Asian-dust-storm (ADS) period of April 2001. Three ADS events were observed during the periods of April 10-12, 13-14, and 25-26. Average concentration levels of daytime OH and nighttime NO3 on Jeju Island during the ADS period were estimated to be about 1×106 and 2×10 8 moleculescm-3 (∼9 pptv), respectively. OH levels during the ADS period were lower than those during the non-Asian-dust-storm (NADS) period by a factor of 1.5. This was likely to result from higher CO levels and the significant loading of dust particles, reducing the photolysis frequencies of ozone. Decreases in NO3 levels during the ADS period was likely to be determined mainly by the enhancement of the N2O 5 heterogeneous reaction on dust aerosol surfaces. Averaged over 24 h, the reaction between HO2 and NO was the most important source of OH during the study period, followed by ozone photolysis, which contributed more than 95% of the total source. The reactions with CO, NO2, and non-methane hydrocarbons (NMHCs) during the study period were major sinks for OH. The reaction of N2O5 on aerosol surfaces was a more important sink for nighttime NO3 during the ADS due to the significant loading of dust particles. The reaction of NO3 with NMHCs and the gas-phase reaction of N2O5 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 NO3 were of no importance. © 2003 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)1127-1142
    Number of pages15
    JournalChemosphere
    Volume55
    Issue number8
    DOIs
    Publication statusPublished - May 2004

    Keywords

    • ACE-Asia
    • Asian-dust-storm
    • Jeju Island
    • NO3
    • OH

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