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| Titel |
Atmospheric chemistry of nitrogenous aerosols in northeastern Asia: biological sources and secondary formation |
| VerfasserIn |
C. M. Pavuluri, K. Kawamura, P. Q. Fu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 17 ; Nr. 15, no. 17 (2015-09-02), S.9883-9896 |
| Datensatznummer |
250120012
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| Publikation (Nr.) |
 copernicus.org/acp-15-9883-2015.pdf |
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| Zusammenfassung |
| 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
(δ15N) of TN (δ15NTN) and WSTN (δ15NWSTN) 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). δ15NTN (21.9 ±
4.1 ‰) and δ15NWSTN (25.8 ±
8.2 ‰) 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 δ15NTN and
δ15NWSTN, 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. |
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