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| Titel |
Size and composition measurements of background aerosol and new particle growth in a Finnish forest during QUEST 2 using an Aerodyne Aerosol Mass Spectrometer |
| VerfasserIn |
J. D. Allan, M. R. Alfarra, K. N. Bower, H. Coe, J. T. Jayne, D. R. Worsnop, P. P. Aalto, M. Kulmala  , T. Hyötyläinen, F. Cavalli, A. Laaksonen |
| 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 ; 6, no. 2 ; Nr. 6, no. 2 (2006-02-06), S.315-327 |
| Datensatznummer |
250003410
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| Publikation (Nr.) |
 copernicus.org/acp-6-315-2006.pdf |
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| Zusammenfassung |
| The study of the growth of nucleation-mode particles is important, as this
prevents their loss through diffusion and allows them to reach sizes where
they may become effective cloud condensation nuclei. Hyytiälä, a
forested site in southern Finland, frequently experiences particle
nucleation events during the spring and autumn, where particles first appear
during the morning and continue to grow for several hours afterwards. As
part of the QUEST 2 intensive field campaign during March and April 2003, an
Aerodyne Aerosol Mass Spectrometer (AMS) was deployed alongside other
aerosol instrumentation to study the particulate composition and dynamics of
growth events and characterise the background aerosol. Despite the small
mass concentrations, the AMS was able to distinguish the grown particles in
the <100 nm regime several hours after an event and confirm that the
particles were principally organic in composition. The AMS was also able to
derive a mass spectral fingerprint for the organic species present, and
found that it was consistent between events and independent of the mean
particle diameter during non-polluted cases, implying the same species were
also condensing onto the accumulation mode. The results were compared with
those from offline analyses such as GC-MS and were consistent with the
hypothesis that the main components were alkanes from plant waxes and the
oxidation products of terpenes. |
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