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東アジアにおける燃焼酸化鉄の観測; エアロゾルの光吸収増強の可能性

Observation of combustion-derived iron oxides in East Asia; Potential enhancement of aerosol light absorption

土屋 望*; 山田 怜奈*; 畑 光彦*; 古内 正美*; 松木 篤*; 池盛 文数*; 川崎 一雄*; 岩本 洋子*; 兼保 直樹*; 渡邊 隆広   ; 亀田 貴之*; 南 雅代*; 中村 俊夫*

Tsuchiya, Nozomu*; Yamada, Rena*; Hata, Mitsuhiko*; Furuuchi, Masami*; Matsuki, Atsushi*; Ikemori, Fumikazu*; Kawasaki, Kazuo*; Iwamoto, Yoko*; Kaneyasu, Naoki*; Watanabe, Takahiro; Kameda, Takayuki*; Minami, Masayo*; Nakamura, Toshio*

本研究では、能登半島の観測サイト(Noto Ground-based Research Observatory, NOTOGRO)で採取したエアロゾル試料の放射性炭素濃度、安定同位体比、元素状炭素、有機・無機化学分析及び残留磁化測定等を実施した。特に、エアロゾルの成分である酸化鉄の含有量を反映する残留磁化と元素状炭素のデータを用いてPM2.5発生源に関する新たな環境指標を提唱した。

This study aimed to elucidate the seasonal (temporal) variation of iron oxides and their source based on the annual observation using environmental magnetic measurement at a downwind remote site in Noto. As a result, iron oxides (magnetization) showed a similar variation to black carbon (BC), but the BC-magnetization ratio increased/decreased depending on the combustion source: coal (continental), oil (domestic), biomass. This ratio can therefore be regarded as an environmental proxy to identify the combustion source.

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