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| Titel |
Atmospheric submicron aerosol composition and particulate organic nitrate formation in a boreal forestland–urban mixed region |
| VerfasserIn |
L. Q. Hao, A. Kortelainen, S. Romakkaniemi, H. Portin, A. Jaatinen, A. Leskinen, M. Komppula, P. Miettinen, D. Sueper, A. Pajunoja, J. N. Smith, K. E. J. Lehtinen, D. R. Worsnop, A. Laaksonen, A. Virtanen |
| 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. 24 ; Nr. 14, no. 24 (2014-12-18), S.13483-13495 |
| Datensatznummer |
250119250
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| Publikation (Nr.) |
 copernicus.org/acp-14-13483-2014.pdf |
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| Zusammenfassung |
| The Puijo aerosol–cloud observation station is a unique measurement site for
its location in the mixed region between the boreal forestland and the
municipality of Kuopio, Finland. A measurement campaign was carried out at
the station during fall 2010. An Aerodyne high-resolution time-of-flight
aerosol mass spectrometer (HR-Tof-AMS) was deployed to characterize the
atmospheric submicron aerosols. Positive matrix factorization (PMF) was
applied to the unified high-resolution mass spectra organic species with
NO+ and NO2+ ions to discover the intrinsic relationships
between the organic and inorganic species and their daily cycles. On
average, the submicron aerosols in this study were dominated by organic and
sulfate species, composing 48.2 and 28.7% of total observed aerosol
mass, respectively, with smaller contributions from ammonium (9.3%),
nitrate (4.9%), chloride (0.8%) and BC (8.1%). The sources of these
species included the primary emissions originating from the city area,
secondary formation from both natural and anthropogenic emissions and
regional transport. The PMF analysis succeeded in separating the mixed
organic and inorganic spectra into three distinct organic and one inorganic
factors. For organic factors, the semi-volatile oxygenated organic aerosol
(SVOOA) and low-volatility oxygenated OA (LVOOA) accounted for 54.8 and
36.3% of total organic masses, respectively, while the hydrocarbon-like
organic aerosol (HOA) accounted for 8.9% of total organics, with its main
source from urban emissions. The inorganic factor is identified as
NH4NO3, comprising 6.9% of the fitted aerosol mass by PMF.
Based on the PMF results, the nitrate species were separated into organic
and inorganic components, with the organic nitrates contributing one-third of the
total nitrate mass. The results highlight both anthropogenic and biogenic
emissions as important atmospheric aerosol sources in a forest–urban mixed
region. |
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