2004年春季の沖縄辺戸岬集中観測におけるアジアからの汚染大気長距離輸送の大気微量成分への影響

DOI Web Site 被引用文献2件 参考文献34件

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タイトル別名
  • Influence from long-range transport of Asian outflow on O3, CO and VOCs concentrations during an intensive measurement campaign at Cape Hedo, Okinawa, in spring 2004
  • Influence from long-range transport of Asian outflow on 03, CO and VOCs concentrations during an intensive measurement campaign a Cape Hedo, Okinawa, in spring 2004

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Atmospheric O3, CO and VOCs were measured during spring 2004 at remote site, Hedo, on Okinawa main island. Backward trajectory analysis was employed in order to determine the long-range transport pathways as C (China), K (Korea), J (Japan), and O (Pacific Ocean), for different air masses before reaching to the observatory. The results show clearly the high concentration of these traces gases were arriving from the C and K directions; O3 of 56.4 and 62.2 ppbv and CO of 240 and 209 ppbv, respectively. The events of high-O3 low-CO caused O3 monthly averaged mixing ratio in the K higher than of that in the C. The lowest concentration was found in the O. Air mass from the J shows intermediate concentration. VOCs were found to decrease in concentration with an increase in carbon number. This is the signature of the capture of aged air mass. Similar trend of alkanes is the evidence of the clean atmosphere surround the site where there is no nearby emission sources. The main VOCs removal processes are reaction with OH radical. Effect from dilution also takes part in reduction of VOCs concentration. VOCs enhancement ratios obtained from various species were consistent with findings reported from observations in Asian countries. Ratios between i-pentane/n-pentane from the C and K air mass suggested the change in composition of emission arriving from these directions.

収録刊行物

  • 大気環境学会誌

    大気環境学会誌 42 (6), 350-361, 2007

    公益社団法人 大気環境学会

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