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| Titel |
Atmospheric new particle formation as a source of CCN in the eastern Mediterranean marine boundary layer |
| VerfasserIn |
N. Kalivitis, V.-M. Kerminen, G. Kouvarakis, I. Stavroulas, A. Bougiatioti, A. Nenes, H. E. Manninen, T. Petäjä, M. Kulmala  , N. Mihalopoulos |
| 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. 16 ; Nr. 15, no. 16 (2015-08-20), S.9203-9215 |
| Datensatznummer |
250119976
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| Publikation (Nr.) |
 copernicus.org/acp-15-9203-2015.pdf |
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| Zusammenfassung |
| While cloud condensation nuclei (CCN) production associated with atmospheric
new particle formation (NPF) is thought to be frequent throughout the
continental boundary layers, few studies on this phenomenon in marine air
exist. Here, based on simultaneous measurement of particle number size
distributions, CCN properties and aerosol chemical composition, we present
the first direct evidence on CCN production resulting from NPF in the
eastern Mediterranean atmosphere. We show that condensation of both gaseous
sulfuric acid and organic compounds from multiple sources leads to the rapid
growth of nucleated particles to CCN sizes in this environment during the
summertime. Sub-100 nm particles were found to be substantially less
hygroscopic than larger particles during the period with active NPF and
growth (the value of κ was lower by 0.2–0.4 for 60 nm particles
compared with 120 nm particles), probably due to enrichment of organic
material in the sub-100 nm size range. The aerosol hygroscopicity tended to
be at minimum just before the noon and at maximum in the afternoon, which was
very likely due to the higher sulfate-to-organic ratios and higher degree of
oxidation of the organic material during the afternoon. Simultaneous with
the formation of new particles during daytime, particles formed during the
previous day or even earlier were growing into the size range relevant to
cloud droplet activation, and the particles formed in the atmosphere were
possibly mixed with long-range-transported particles. |
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