2010年沖縄県辺戸岬における東アジアに由来する多環芳香族炭化水素類の長距離輸送

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  • Long-Range Transport of Polycyclic Aromatic Hydrocarbons from East Asia at Cape Hedo in 2010
  • 2010ネン オキナワケン ヘンドミサキ ニ オケル ヒガシアジア ニ ユライ スル タカン ホウコウゾク タンカスイソルイ ノ チョウキョリ ユソウ

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Polycyclic aromatic hydrocarbons (PAHs) in aerosols were observed at Cape Hedo (26.87°N, 128.25°E, 60 m above sea level), Okinawa, where there is no influence of local anthropogenic emission, in order to investigate long-range transport of pollution from East Asia. The observations were conducted every season in 2010. The average concentrations of total suspended particles (TSP) in spring (n = 22), summer (n = 5), autumn (n = 4), and winter (n = 4) were 54.0 ± <nobr>26.4 μg m-3,</nobr> 24.9 ± <nobr>7.28 μg m-3,</nobr> 47.6 ± <nobr>34.0 μg m-3,</nobr> and 60.3 ± <nobr>34.1 μg m-3</nobr>, respectively. The average total PAHs (15 species) were 474 ± <nobr>671 pg m-3,</nobr> 14.5 ± <nobr>2.45 pg m-3,</nobr> 220 ± <nobr>239 pg m-3,</nobr> and 2443 ± <nobr>2466 pg m-3,</nobr> respectively. Both TSP and total PAHs showed the maximum during the spring, and showed the minimum during the summer. Backward trajectories and cluster processing indicated that the concentrations of pollutants depend on origins of air masses. The ratio of isomers of PAHs showed that the origins of winter air masses were coal and biomass combustion, while those in spring and autumn were mainly petroleum combustion.<br>

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