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Atmospheric chemistry of nitrogenous aerosols in northeastern Asia: biological sources and secondary formation

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Title: Atmospheric chemistry of nitrogenous aerosols in northeastern Asia: biological sources and secondary formation
Authors: Pavuluri, C. M. Browse this author
Kawamura, K. Browse this author →KAKEN DB
Fu, P. Q. Browse this author
Issue Date: 2-Sep-2015
Publisher: Copernicus Publications on behalf of the European Geosciences Union (EGU)
Journal Title: Atmospheric chemistry and physics
Volume: 15
Issue: 17
Start Page: 9883
End Page: 9896
Publisher DOI: 10.5194/acp-15-9883-2015
Abstract: To better understand the sources of nitrogenous aerosols, particularly water-soluble organic nitrogen (WSON) and water-insoluble organic nitrogen (WION), in northeastern Asia, we measured total nitrogen (TN) and water-soluble total nitrogen (WSTN) as well as nitrogen isotope ratios (delta N-15) of TN (delta N-15(TN)) and WSTN (delta N-15(WSTN)) in the total suspended particulate (TSP) samples collected from Sapporo, northern Japan, for a 1-year period. In general, WION was more abundant (126 +/- 117 ng m(-3)), whereas WSON was 89.7 +/- 80.6 ng m(-3), accounting for 14 +/- 11% and 9.2 +/- 7.3% of TN, respectively. WSON peaked in late autumn to winter (maximum 288 ng m(-3)) and WION peaked in mid-spring to early summer (454 ng m(-3)). delta N-15(TN) (21.9 +/- 4.1 parts per thousand) and delta N-15(WSTN) (25.8 +/- 82 parts per thousand) showed peaks in summer with relatively high ratios in late autumn. Based on the seasonal variations in WSON and WION together with organic tracers, fossil fuel combustion and biomass burning are found to be two major sources of WSON, whereas emissions of biological particles and secondary formation by reactions of biogenic secondary organic species (carbonyls) with NH3 are suggested as an important source of WION. The seasonality of delta N-15(TN) and delta N-15(WSTN), together with the comparisons to literature values, implies that chemical aging (including gas-particle partitioning) and biomass burning are the causes of the enhanced values in summer and autumn, respectively. This study demonstrates that contributions of aerosol N from fossil fuel combustion and biomass burning dominate in autumn and/or winter, whereas emission of terrestrial biological particles and secondary formation from biogenic hydrocarbons and subsequent chemical aging in the atmosphere are important in spring and/or summer in northeastern Asia.
Type: article
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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