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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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Title: Elevated nitrogen isotope ratios of tropical Indian aerosols from Chennai : Implication for the origins of aerosol nitrogen in South and Southeast Asia
Authors: Pavuluri, Chandra Mouli Browse this author
Kawamura, Kimitaka Browse this author
Tachibana, Eri Browse this author
Swaminathan, T. Browse this author
Keywords: Nitrogen isotope ratios
Tropical Indian aerosols
Cow-dung samples
Source of aerosol nitrogen
South Asia
Issue Date: Sep-2010
Publisher: Elsevier
Journal Title: Atmospheric Environment
Volume: 44
Issue: 29
Start Page: 3597
End Page: 3604
Publisher DOI: 10.1016/j.atmosenv.2010.05.039
Abstract: 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.
Type: article (author version)
URI: http://hdl.handle.net/2115/43847
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 河村 公隆

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