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| Titel |
Growth rates of nucleation mode particles in Hyytiälä during 2003-2009: variation with particle size, season, data analysis method and ambient conditions |
| VerfasserIn |
T. Yli-Juuti, T. Nieminen, A. Hirsikko, P. P. Aalto, E. Asmi, U. Hõrrak, H. E. Manninen, J. Patokoski, M. Maso, T. Petäjä, J. Rinne, M. Kulmala  , I. Riipinen |
| 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 ; 11, no. 24 ; Nr. 11, no. 24 (2011-12-20), S.12865-12886 |
| Datensatznummer |
250010283
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| Publikation (Nr.) |
 copernicus.org/acp-11-12865-2011.pdf |
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| Zusammenfassung |
| The condensational growth rate of aerosol particles formed in atmospheric
new particle formation events is one of the most important factors
influencing the lifetime of these particles and their ability to become
climatically relevant. Diameter growth rates (GR) of nucleation mode
particles were studied based on almost 7 yr of data measured during the
years 2003–2009 at a boreal forest measurement station SMEAR II in
Hyytiälä, Finland. The particle growth rates were estimated using
particle size distributions measured with a Differential Mobility Particle
Sizer (DMPS), a Balanced Scanning Mobility Analyzer (BSMA) and an Air Ion
Spectrometer (AIS). Two GR analysis methods were tested. The particle growth
rates were also compared to an extensive set of ambient meteorological
parameters and trace gas concentrations to investigate the
processes/constituents limiting the aerosol growth. The median growth rates
of particles in the nucleation mode size ranges with diameters of 1.5–3 nm,
3–7 nm and 7–20 nm were 1.9 nm h−1, 3.8 nm h−1, and 4.3 nm h−1,
respectively. The median relative uncertainties in the growth
rates due to the size distribution instrumentation in these size ranges were
25%, 19%, and 8%, respectively. For the smallest particles
(1.5–3 nm) the AIS data yielded on average higher growth rate values than
the BSMA data, and higher growth rates were obtained from positively charged
size distributions as compared with negatively charged particles. For
particles larger than 3 nm in diameter no such systematic differences were
found. For these particles the uncertainty in the growth rate related to the
analysis method, with relative uncertainty of 16%, was similar to that
related to the instruments. The growth rates of 7–20 nm particles showed
positive correlation with monoterpene concentrations and their oxidation rate by
ozone. The oxidation rate by OH did not show a connection with GR. Our
results indicate that the growth of nucleation mode particles in
Hyytiälä is mainly limited by the concentrations of organic
precursors. |
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