Evaluation of source contribution and horizontal distribution of black carbon aerosols in the NW Pacific region using carbon isotopes

PM_&lt；2.5&gt；气溶胶已经在福岛、冲绳河户角和池池岛采集到。以确定自2009年秋季以来黑碳的相对来源贡献。对一周平均气溶胶样品的碳同位素分析表明，福库采集的黑碳中δ^&lt；13&gt；C在夏季降至-26.0‰以下，而在秋季、冬季和春季有所增加，表明夏季机动车尾气的贡献率较高，其余时间燃煤和C4厂的燃烧贡献率较高。对河口角和池池岛的分析是。仍在进行中。

PM_<2.5> aerosols have been collected at Fukue Is., Cape Hedo of Okinawa Is., and Chi-chi jima Is. to identify the relative source contribution of black carbon since 2009 autumn. Carbon isotope analysis for one-week averaged aerosol sample showed thatδ^<13> C in the black carbon collected at Fukue decreased below-26.0‰in summer but increased in autumn, winter and spring, suggesting that contribution of motor vehicle exhaust is high in summer and that of combustion from coal and C4 plant is high in the rest of the year. The analysis of Cape Hedo and Chi-chi jima Is. is still underway.