TY  - JOUR
A1  - Keskinen, Helmi
A1  - Virtanen, Annele
A1  - Joutsensaari, Jorma
A1  - Tsagkogeorgas, Georgios
A1  - Duplissy, Jonathan
A1  - Schobesberger, Siegfried
A1  - Gysel, Martin
A1  - Riccobono, Francesco
A1  - Slowik, Jay G.
A1  - Bianchi, Federico
A1  - Yli-Juuti, Taina
A1  - Lehtipalo, Katrianne
A1  - Rondo, Linda
A1  - Breitenlechner, Martin
A1  - Kupc, Agnieszka
A1  - Almeida, Joao
A1  - Amorin, António
A1  - Dunne, Eimear M.
A1  - Downward, Andrew J.
A1  - Ehrhart, Sebastian
A1  - Franchin, Alessandro
A1  - Kajos, Maija K.
A1  - Kirkby, Jasper
A1  - Kürten, Christoph Andreas
A1  - Nieminen, Tuomo
A1  - Makhmutov, Vladimir
A1  - Mathot, Serge
A1  - Miettinen, Pasi
A1  - Onnela, Antti
A1  - Petäjä, Tuukka
A1  - Praplan, Arnaud Patrick
A1  - Santos, Filipe Duarte
A1  - Schallhart, Simon
A1  - Sipilä, Mikko
A1  - Stozhkov, Yuri
A1  - Tomé, Antonio
A1  - Vaattovaara, Petri
A1  - Wimmer, Daniela
A1  - Prévôt, André Stephan Henry
A1  - Dommen, Josef
A1  - Donahue, Neil McPherson
A1  - Flagan, Richard C.
A1  - Weingartner, Ernest
A1  - Viisanen, Yrjö
A1  - Riipinen, Ilona
A1  - Hansel, Armin
A1  - Curtius, Joachim
A1  - Kulmala, Markku
A1  - Worsnop, Douglas R.
A1  - Baltensperger, Urs
A1  - Wex, Heike
A1  - Stratmann, Frank
A1  - Laaksonen, Ari
T1  - Evolution of particle composition in CLOUD nucleation experiments
T2  - Atmospheric chemistry and physics
N2  - Sulphuric acid, ammonia, amines, and oxidised organics play a crucial role in nanoparticle formation in the atmosphere. In this study, we investigate the composition of nucleated nanoparticles formed from these compounds in the CLOUD (Cosmics Leaving Outdoor Droplets) chamber experiments at CERN (Centre européen pour la recherche nucléaire). The investigation was carried out via analysis of the particle hygroscopicity, ethanol affinity, oxidation state, and ion composition. Hygroscopicity was studied by a hygroscopic tandem differential mobility analyser and a cloud condensation nuclei counter, ethanol affinity by an organic differential mobility analyser and particle oxidation level by a high-resolution time-of-flight aerosol mass spectrometer. The ion composition was studied by an atmospheric pressure interface time-of-flight mass spectrometer. The volume fraction of the organics in the particles during their growth from sizes of a few nanometers to tens of nanometers was derived from measured hygroscopicity assuming the Zdanovskii–Stokes–Robinson relationship, and compared to values gained from the spectrometers. The ZSR-relationship was also applied to obtain the measured ethanol affinities during the particle growth, which were used to derive the volume fractions of sulphuric acid and the other inorganics (e.g. ammonium salts). In the presence of sulphuric acid and ammonia, particles with a mobility diameter of 150 nm were chemically neutralised to ammonium sulphate. In the presence of oxidation products of pinanediol, the organic volume fraction of freshly nucleated particles increased from 0.4 to ~0.9, with an increase in diameter from 2 to 63 nm. Conversely, the sulphuric acid volume fraction decreased from 0.6 to 0.1 when the particle diameter increased from 2 to 50 nm. The results provide information on the composition of nucleated aerosol particles during their growth in the presence of various combinations of sulphuric acid, ammonia, dimethylamine and organic oxidation products.
Y1  - 2013
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/31773
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-317739
SN  - 1680-7324
SN  - 1680-7316
N1  - © Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License.
VL  - 13
SP  - 5587
EP  - 5600
PB  - EGU
CY  - Katlenburg-Lindau.
ER  -