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

Pavuluri, Chandra Mouli; Kawamura, Kimitaka; Tachibana, Eri; Swaminathan, T.

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

Pavuluri, Chandra Mouli; Kawamura, Kimitaka; Tachibana, Eri et al.

Atmospheric Environment, 2010, 44(29), 3597-3604

Permalink : https://hdl.handle.net/2115/43847

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アクセス権	open access
URI	https://hdl.handle.net/2115/43847
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 ; Kawamura, Kimitaka ; Tachibana, Eri ; Swaminathan, T.
著者名 Pavuluri, Chandra Mouli
著者名 Kawamura, Kimitaka
著者名 Tachibana, Eri
著者名 Swaminathan, T.
言語	英語
キーワード	Nitrogen isotope ratios
	Tropical Indian aerosols
	Cow-dung samples
	Source of aerosol nitrogen
	South Asia
発行日	2010-09
出版者	Elsevier
収録物名	Atmospheric Environment
巻(号)	44(29)
ページ	3597-3604
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.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
PISSN	1352-2310
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.atmosenv.2010.05.039