The search result changed since you submitted your search request. Documents might be displayed in a different sort order.
  • search hit 1 of 6
Back to Result List

The role of ions in new-particle formation in the CLOUD chamber

  • The formation of secondary particles in the atmosphere accounts for more than half of global cloud condensation nuclei. Experiments at the CERN CLOUD (Cosmics Leaving OUtdoor Droplets) chamber have underlined the importance of ions for new particle formation, but quantifying their effect in the atmosphere remains challenging. By using a novel instrument setup consisting of two nano-particle counters, one of them equipped with an ion filter, we were able to further investigate the ion-related mechanisms of new particle formation. In autumn 2015, we carried out experiments at CLOUD on four systems of different chemical compositions involving monoterpenes, sulfuric acid, nitrogen oxides, and ammonia. We measured the influence of ions on the nucleation rates under precisely controlled and atmospherically relevant conditions. Our results indicate that ions enhance the nucleation process when the charge is necessary to stabilize newly formed clusters, i.e. in conditions where neutral clusters are unstable. For charged clusters that were formed by ion-induced nucleation, we were able to measure, for the first time, their progressive neutralization due to recombination with oppositely charged ions. A large fraction of the clusters carried a charge at 1.2 nm diameter. However, depending on particle growth rates and ion concentrations, charged clusters were largely neutralized by ion–ion recombination before they grew to 2.2 nm. At this size, more than 90 % of particles were neutral. In other words, particles may originate from ion-induced nucleation, although they are neutral upon detection at diameters larger than 2.2 nm. Observations at Hyytiälä, Finland, showed lower ion concentrations and a lower contribution of ion-induced nucleation than measured at CLOUD under similar conditions. Although this can be partly explained by the observation that ion-induced fractions decrease towards lower ion concentrations, further investigations are needed to resolve the origin of the discrepancy.

Download full text files

Export metadata

Metadaten
Author:Robert WagnerORCiDGND, Chao Yan, Katrianne LehtipaloORCiDGND, Jonathan DuplissyORCiD, Tuomo Nieminen, Juha Kangasluoma, Lauri R. AhonenORCiD, Lubna DadaORCiDGND, Jenni Kontkanen, Hanna Elina ManninenORCiD, Antonio Dias, Antonio AmorimORCiD, Paulus Salomon Bauer, Anton Bergen, Anne-Kathrin Bernhammer, Federico BianchiORCiDGND, Sophia Brilke, Stephany Buenrostro Mazon, Xuemeng Chen, Danielle C. Draper, Lukas FischerORCiD, Carla Frege, Claudia Fuchs, Olga Garmash, Hamish Gordon, Jani Hakala, Liine Heikkinen, Martin HeinritziORCiDGND, Victoria Hofbauer, Christopher Robert Hoyle, Jasper KirkbyORCiD, Christoph Andreas KürtenORCiDGND, Alexander N. Kvashnin, Tiia Laurila, Michael Joseph Lawler, Huajun Mai, Vladimir MakhmutovORCiD, Roy Lee MauldinORCiD, Ugo Molteni, Leonid Nichman, Wei Nie, Andrea Ojdanic, Antti OnnelaORCiD, Felix Piel, Lauriane L. J. Quéléver, Matti P. RissanenORCiD, Nina Sarnela, Simon Schallhart, Kamalika Sengupta, Mario SimonORCiD, Dominik StolzenburgORCiD, Yuri Stozhkov, Jasmin Tröstl, Yrjö Viisanen, Alexander L. VogelORCiDGND, Andrea Christine WagnerGND, Mao Xiao, Penglin Ye, Urs BaltenspergerORCiDGND, Joachim CurtiusORCiD, Neil McPherson DonahueORCiDGND, Richard C. FlaganORCiD, Martin William Gallagher, Armin HanselORCiD, James N. Smith, Antonio Tomé, Paul M. WinklerORCiD, Douglas R. WorsnopORCiD, Mikael Ehn, Mikko SipiläORCiD, Veli-Matti Kerminen, Tuukka Petäjä, Markku KulmalaORCiDGND
URN:urn:nbn:de:hebis:30:3-445567
DOI:https://doi.org/10.5194/acp-2017-536
ISSN:1680-7375
ISSN:1680-7367
Parent Title (English):Atmospheric chemistry and Physics. Discussions
Publisher:EGU
Place of publication:Katlenburg-Lindau
Document Type:Article
Language:English
Year of Completion:2017
Date of first Publication:2017/07/17
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2017/12/19
Volume:17
Page Number:27
First Page:1
Last Page:27
Note:
© Author(s) 2017. CC BY 4.0 License.
HeBIS-PPN:426710894
Institutes:Geowissenschaften / Geographie / Geowissenschaften
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 4.0