| Literature DB >> 24833386 |
Francesco Riccobono1, Siegfried Schobesberger2, Catherine E Scott3, Josef Dommen1, Ismael K Ortega2, Linda Rondo4, João Almeida4, Antonio Amorim5, Federico Bianchi1, Martin Breitenlechner6, André David7, Andrew Downard8, Eimear M Dunne3, Jonathan Duplissy9, Sebastian Ehrhart4, Richard C Flagan8, Alessandro Franchin2, Armin Hansel6, Heikki Junninen2, Maija Kajos2, Helmi Keskinen10, Agnieszka Kupc11, Andreas Kürten4, Alexander N Kvashin12, Ari Laaksonen10, Katrianne Lehtipalo2, Vladimir Makhmutov12, Serge Mathot7, Tuomo Nieminen9, Antti Onnela7, Tuukka Petäjä2, Arnaud P Praplan1, Filipe D Santos5, Simon Schallhart2, John H Seinfeld8, Mikko Sipilä9, Dominick V Spracklen3, Yuri Stozhkov12, Frank Stratmann13, Antonio Tomé5, Georgios Tsagkogeorgas13, Petri Vaattovaara10, Yrjö Viisanen14, Aron Vrtala11, Paul E Wagner11, Ernest Weingartner1, Heike Wex13, Daniela Wimmer4, Kenneth S Carslaw3, Joachim Curtius4, Neil M Donahue15, Jasper Kirkby16, Markku Kulmala9, Douglas R Worsnop17, Urs Baltensperger18.
Abstract
Atmospheric new-particle formation affects climate and is one of the least understood atmospheric aerosol processes. The complexity and variability of the atmosphere has hindered elucidation of the fundamental mechanism of new-particle formation from gaseous precursors. We show, in experiments performed with the CLOUD (Cosmics Leaving Outdoor Droplets) chamber at CERN, that sulfuric acid and oxidized organic vapors at atmospheric concentrations reproduce particle nucleation rates observed in the lower atmosphere. The experiments reveal a nucleation mechanism involving the formation of clusters containing sulfuric acid and oxidized organic molecules from the very first step. Inclusion of this mechanism in a global aerosol model yields a photochemically and biologically driven seasonal cycle of particle concentrations in the continental boundary layer, in good agreement with observations.Entities:
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Year: 2014 PMID： 24833386 DOI： 10.1126/science.1243527
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728