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| Titel |
Physicochemical properties and origin of organic groups detected in boreal forest using an aerosol mass spectrometer |
| VerfasserIn |
T. Raatikainen, P. Vaattovaara, P. Tiitta, P. Miettinen, J. Rautiainen, M. Ehn, M. Kulmala  , A. Laaksonen, D. R. Worsnop |
| 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 ; 10, no. 4 ; Nr. 10, no. 4 (2010-02-23), S.2063-2077 |
| Datensatznummer |
250008134
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| Publikation (Nr.) |
 copernicus.org/acp-10-2063-2010.pdf |
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| Zusammenfassung |
| An Aerodyne quadrupole aerosol mass spectrometer (Q-AMS) was deployed in Hyytiälä,
a forested rural measurement site in southern Finland, during a 2-week measurement campaign
in spring 2005. Q-AMS measures mass concentrations of non-refractory species including
sulphate, nitrate, ammonium and organics from submicron particles. A positive matrix
factorization method was used in identifying two oxygenated organic aerosol (OOA) groups
from the measured total organic mass. The properties of these groups were estimated from
their diurnal concentration cycles and correlations with additional data such as air mass
history, particle number size distributions, hygroscopic and ethanol growth factors and
particle volatility. It was found that the aged and highly oxidized background organic
aerosol (OOA1 or LV-OOA) species have a wide range of hygroscopic growth factors and volatilization
temperatures, but on the average OOA1 is the less volatile and more hygroscopic organic group.
Hygroscopic properties and volatilities of the OOA1 species are correlated so
that the less volatile species have higher hygroscopic growth factors. The other, less
oxidized organic aerosol group (OOA2 or SV-OOA) is more volatile and non-hygroscopic. Trajectory
analysis showed that OOA1 and the inorganic species are mainly long-range transported
anthropogenic pollutions. OOA2 species and its precursor gases have short
atmospheric life times, so they are from local sources. These results span the
range of previous observations of oxygen content, volatility and hygroscopic
growth factor, simultaneously coupling all three measurements for the first time. |
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