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| Titel |
Understanding the anthropogenic influence on formation of biogenic secondary organic aerosols in Denmark via analysis of organosulfates and related oxidation products |
| VerfasserIn |
Q. T. Nguyen, M. K. Christensen, F. Cozzi, A. Zare, A. M. K. Hansen, K. Kristensen, T. E. Tulinius, H. H. Madsen, J. H. Christensen, J. Brandt, A. Maßling, J. K. Nøjgaard, M. Glasius |
| 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 ; 14, no. 17 ; Nr. 14, no. 17 (2014-09-01), S.8961-8981 |
| Datensatznummer |
250118994
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| Publikation (Nr.) |
 copernicus.org/acp-14-8961-2014.pdf |
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| Zusammenfassung |
| Anthropogenic emissions of sulfur dioxide (SO2) and nitrogen oxides
(NOx) may affect concentration levels and composition of biogenic
secondary organic aerosols (BSOA) through photochemical reactions with
biogenic organic precursors to form organosulfates and nitrooxy
organosulfates. We investigated this influence in a field study from 19 May
to 22 June, 2011 at two sampling sites in Denmark. Within the study, we
identified a substantial number of organic acids, organosulfates and nitrooxy
organosulfates in the ambient urban curbside and semi-rural background air. A
high degree of correlation in concentrations was found among a group of
specific organic acids, organosulfates and nitrooxy organosulfates, which may
originate from various precursors, suggesting a common mechanism or factor
affecting their concentration levels at the sites. It was proposed that the
formation of those species most likely occurred on a larger spatial scale,
with the compounds being long-range transported to the sites on the days with
the highest concentrations. The origin of the long-range transported aerosols
was investigated using the Hybrid Single Particle Lagrangian Integrated
Trajectory (HYSPLIT) model in addition to modeled emissions of related
precursors, including isoprene and monoterpenes using the global Model of
Emissions of Gases and Aerosols from Nature (MEGAN) and SO2 emissions
using the European Monitoring and Evaluation Program (EMEP) database. The
local impacts were also studied by examining the correlation between selected
species, which showed significantly enhanced concentrations at the urban
curbside site and the local concentrations of various gases, including
SO2, ozone (O3), NOx, aerosol acidity and other
meteorological conditions. This investigation showed that an inter-play of
the local parameters such as the aerosol acidity, NOx, SO2,
relative humidity (RH), temperature and global radiation seemed to affect the
concentration level of those species, suggesting the influence of aqueous
aerosol chemistry. The local impacts, however, seemed minor compared to the
regional impacts. The total concentrations of organosulfates and nitrooxy
organosulfates, on average, contributed to approximately 0.5–0.8% of
PM1 mass at the two sampling sites. |
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