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High concentrations of sub-3nm clusters and frequent new particle formation observed in the Po Valley, Italy, during the PEGASOS 2012 campaign

Kontkanen, Jenni; Jaervinen, Emma; Manninen, Hanna E.; Lehtipalo, Katrianne; Kangasluoma, Juha; Decesari, Stefano; Gobbi, Gian Paolo; Laaksonen, Ari; Petaja, Tuukka; Kulmala, Markku

Abstract:
The concentrations of neutral and charged sub- 3nm clusters and their connection to new particle formation (NPF) were investigated during the PEGASOS campaign (7 June–9 July 2012) at the San Pietro Capofiume measurement station in the Po Valley, Italy. Continuous high concentrations of sub-3nm clusters were detected during the measurement period, although the condensation sink was relatively high (median value 1.1×10$^{-2}$ s$^{-1}$). The median cluster concentrations were 2140 and 7980 cm$^{-3}$ in the size bins of 1.5–1.8 and 1.8–3 nm, and the majority of them were electrically neutral. NPF events were observed during the measurement period frequently, on 86% of the days. The median growth rates of clusters during the events were 4.3, 6.0 and 7.2 nm h$^{-1}$ in the size ranges of 1.5–3, 3–7 and 7– 20 nm. The median formation rate of 1.6 nm clusters was high, 45 cm$^{-3}$ s$^{-1}$, and it exceeded the median formation rate of 2 nm clusters by 1 order of magnitude. The ion-induced nucleation fraction was low; the median values were 0.7% at 1.6 nm and 3.0% at 2 nm. On NPF event days the neutral cluster concentration had a maximum aro ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Aerosolforschung (IMK-AAF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.5194/acp-16-1919-2016
ISSN: 1680-7316, 1680-7324
URN: urn:nbn:de:swb:90-646595
KITopen ID: 1000064659
HGF-Programm 12.03.03; LK 01
Erschienen in Atmospheric chemistry and physics
Band 16
Heft 4
Seiten 1919-1935
Lizenz CC BY 3.0 DE: Creative Commons Namensnennung 3.0 Deutschland
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