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| Titel |
Relating the hygroscopic properties of submicron aerosol to both gas- and particle-phase chemical composition in a boreal forest environment |
| VerfasserIn |
J. Hong, J. Kim, T. Nieminen, J. Duplissy, M. Ehn, M. Äijälä, L. Q. Hao, W. Nie, N. Sarnela, N. L. Prisle, M. Kulmala  , A. Virtanen, T. Petäjä, V.-M. Kerminen |
| 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. 20 ; Nr. 15, no. 20 (2015-10-28), S.11999-12009 |
| Datensatznummer |
250120128
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| Publikation (Nr.) |
 copernicus.org/acp-15-11999-2015.pdf |
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| Zusammenfassung |
| Measurements of the hygroscopicity of 15–145 nm particles in a boreal forest
environment were conducted using two Hygroscopicity Tandem Differential Mobility Analyzer (HTDMA) systems during the Pan-European
Gas-Aerosols-climate interaction Study (PEGASOS) campaign in spring 2013.
Measurements of the chemical composition of non-size segregated particles
were also performed using a high-resolution aerosol mass spectrometer (HR-AMS) in parallel with hygroscopicity measurements. On average, the
hygroscopic growth factor (HGF) of particles was observed to increase from
the morning until afternoon. In case of accumulation mode particles, the
main reasons for this behavior were increases in the ratio of sulfate to
organic matter and oxidation level (O : C ratio) of the organic matter in the
particle phase. Using an O : C dependent hygroscopic growth factor of organic
matter (HGForg), fitted using the inverse Zdanovskii–Stokes–Robinson
(ZSR) mixing rule, clearly improved the agreement between measured HGF and
that predicted based on HR-AMS composition data. Besides organic oxidation
level, the influence of inorganic species was tested when using the ZSR
mixing rule to estimate the hygroscopic growth factor of organics in the
aerosols. While accumulation and Aitken mode particles were predicted fairly
well by the bulk aerosol composition data, the hygroscopicity of nucleation
mode particles showed little correlation. However, we observed them to be
more sensitive to the gas phase concentration of condensable vapors: the
more sulfuric acid in the gas phase, the more hygroscopic the
nucleation mode particles were. No clear dependence was found between the
extremely low-volatility organics concentration (ELVOC) and the HGF of
particles of any size. |
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