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| Titel |
Estimating neutral nanoparticle steady-state size distribution and growth according to measurements of intermediate air ions |
| VerfasserIn |
H. Tammet, K. Komsaare, U. Hõrrak |
| 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 ; 13, no. 18 ; Nr. 13, no. 18 (2013-09-27), S.9597-9603 |
| Datensatznummer |
250085719
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| Publikation (Nr.) |
 copernicus.org/acp-13-9597-2013.pdf |
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| Zusammenfassung |
| Continuous measurements of intermediate air ion size distributions were
carried out in the small town Tartu, Estonia, from 1 April 2010 through
7 November 2011. The intermediate ions are charged aerosol particles of
diameter 1.5–7.5 nm. In this paper we study what information about neutral
nanoparticles of atmospheric aerosols can be drawn from the air ion
measurements. Rough estimates of the growth rate and the size distribution
of neutral nanoparticles were derived for the subset of measurements while
the concentration of the intermediate ions was close to the median and
remains in the range of 21 ± 2 cm−3. This criterion excludes the
specific new particle formation events characterized with high concentration
of intermediate ions and includes only most typical quiet periods between
the events when the simultaneous growth, depletion and recharging of
particles are described with steady-state equations. We estimated the
growth rate of nanoparticles to be about 2 nm h−1 while the growth flux
or apparent nucleation rate proved to be about 0.5 cm−3 s−1 at 3 nm
and about 0.08 cm−3 s−1 at 7 nm. The results suggest that the
process of new particle formation is not interrupted during the quiet
periods between events of intensive nucleation of atmospheric aerosols. |
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