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Elevated nitrogen isotope ratios of tropical Indian aerosols from Chennai : Implication for the origins of aerosol nitrogen in South and Southeast Asia

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タイトル: Elevated nitrogen isotope ratios of tropical Indian aerosols from Chennai : Implication for the origins of aerosol nitrogen in South and Southeast Asia
著者: Pavuluri, Chandra Mouli 著作を一覧する
Kawamura, Kimitaka 著作を一覧する
Tachibana, Eri 著作を一覧する
Swaminathan, T. 著作を一覧する
キーワード: Nitrogen isotope ratios
Tropical Indian aerosols
Cow-dung samples
Source of aerosol nitrogen
South Asia
発行日: 2010年 9月
出版者: Elsevier
誌名: Atmospheric Environment
巻: 44
号: 29
開始ページ: 3597
終了ページ: 3604
出版社 DOI: 10.1016/j.atmosenv.2010.05.039
抄録: To better understand the origins of aerosol nitrogen, we measured concentrations of total nitrogen (TN) and its isotope ratios (δ15N) in tropical Indian aerosols (PM10) collected from Chennai (13.04° N; 80.17° E) on day- and night-time basis in winter and summer 2007. We found high δ15N values (+15.7 to +31.2‰) of aerosol N (0.3-3.8 μg m-3), in which NH4+ is the major species (78%) with lesser contribution from NO3- (6%). Based on the comparison of δ15N in Chennai aerosols with those reported for atmospheric aerosols from mid-latitudes and for the particles emitted from point sources (including a laboratory study), as well as the δ15N ratios of cow-dung samples (this study), we found that the atmospheric aerosol N in Chennai has two major sources; animal excreta and bio-fuel/biomass burning from South and Southeast Asia. We demonstrate that a gas-to-particle conversion of NH3 to NH4HSO4 and (NH4)2SO4 and the subsequent exchange reaction between NH3 and NH4+ are responsible for the isotopic enrichment of 15N in aerosol nitrogen.
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/43847
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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