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Four years' observations of terrestrial lipid class compounds in marine aerosols from the western North Pacific

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タイトル: Four years' observations of terrestrial lipid class compounds in marine aerosols from the western North Pacific
著者: Kawamura, K. 著作を一覧する
Ishimura, Y. 著作を一覧する
Yamazaki, K. 著作を一覧する
キーワード: marine aerosols
Pacific Ocean
long-range atmospheric transport
normal alkanes
fatty alcohols
fatty acids
発行日: 2003年 1月
出版者: American Geophysical Union
誌名: Global Biogeochemical Cycles
巻: 17
号: 1
開始ページ: 1003
出版社 DOI: 10.1029/2001GB001810
抄録: In order to understand the long-range atmospheric transport of terrestrial organic matter over the open ocean, marine aerosol samples were collected on a biweekly basis from 1990 to 1993 in a remote island, Chichi-Jima, in the western North Pacific. The samples were analyzed for lipid class compounds using a capillary gas chromatography (GC) and GC/mass spectrometry (GC/MS). A homologous series of n-alkanes (C20-C40), alcohols (C13-C34), fatty acids (C9-C34) and α,ω-dicarboxylic acids (C7-C28) were detected in the aerosol samples. Distributions of n-alkanes (0.17–14 ngm−3, average 1.7 ngm−3) are characterized by a strong odd-carbon number predominance (CPI ratios, average 4.5) with a maximum at C29 or C31, indicating that n-alkanes are mainly derived from terrestrial higher plant waxes. Fatty alcohols (0.19–23 ngm−3, average 2.0 ngm−3) show an even-carbon number predominance with a maximum generally at C26 or C28, again indicating a contribution from terrestrial higher plants. On the other hand, fatty acids (2.5–38 ngm−3, average 14 ngm−3) show a bimodal distribution with two maxima at C16 and C24 or C28. Lower molecular weight fatty acids (generally <C20) that are mainly derived from marine organisms showed higher concentrations in summer. In contrast, higher molecular weight fatty acids (C21-C34) derived from terrestrial higher plants, together with C25-C35 alkanes, C20-C34 alcohols and C20-C28 dicarboxylic acids, generally showed higher concentrations in winter to spring seasons. This seasonal trend is most likely interpreted as atmospheric transport of terrestrial organic matter from Asian continent in winter/spring, when westerly winds dominate over the western North Pacific. Backward trajectory analyses supported the long-range atmospheric transport of higher plant- and soil-derived organic matter from the Asian continent over the Pacific Ocean. This study also suggested that the atmospheric transport is the main pathway for the terrestrial lipid compounds that are abundantly present in the deep-sea sediments in the Central Pacific.
記述: ‘An edited version of this paper was published by AGU.’Copyright 2003, American Geophysical Union, Global Biogeochemical Cycles,17
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 河村 公隆


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