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| Titel |
Major contribution of neutral clusters to new particle formation at the interface between the boundary layer and the free troposphere |
| VerfasserIn |
C. Rose, K. Sellegri, E. Asmi, M. Hervo, E. Freney, A. Colomb, H. Junninen, J. Duplissy, M. Sipilä, J. Kontkanen, K. Lehtipalo, M. Kulmala  |
| 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. 6 ; Nr. 15, no. 6 (2015-03-27), S.3413-3428 |
| Datensatznummer |
250119580
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| Publikation (Nr.) |
 copernicus.org/acp-15-3413-2015.pdf |
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| Zusammenfassung |
| The formation of new aerosol particles in the atmosphere is a key process
influencing the aerosol number concentration as well as the climate, in
particular at high altitude, where the newly formed particles directly
influence cloud formation. However, free tropospheric new particle formation
(NPF) is poorly documented due to logistic limitations and complex
atmospheric dynamics around high-altitude stations that make the observation
of this day-time process challenging. Recent improvements in measurement
techniques make now possible the detection of neutral clusters down to
~ 1 nm sizes, which opens new horizons in our understanding of
the nucleation process. Indeed, only the charged fraction of clusters has
been reported in the upper troposphere up to now. Here we report day-time
concentrations of charged and neutral clusters (1 to 2.5 nm mobility
diameter) recorded at the interface between the boundary layer (BL) and the
FT as well as in the FT at the altitude site of Puy de Dôme (1465 m a.s.l.), central France, between 10 and 29 February 2012. Our
findings demonstrate that in the FT, and especially at the interface between
the BL and the FT, the formation of 1.5 nm neutral clusters significantly
exceeds the one of ionic clusters during NPF events, clearly indicating that
they dominate in the nucleation process. We also observe that the total
cluster concentration significantly increases during NPF events compared to
the other days, which was not clearly observed for the charged cluster
population in the past. During the studied period, the nucleation process
does not seem to be sulfuric acid-limited and could be promoted by the
transport of pollutants to the upper troposphere, coupled with low
temperatures. |
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