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Proc Natl Acad Sci U S A

Title:		Alternative pathway for atmospheric particles growth
Author(s):		Monge ME; Rosenorn T; Favez O; Muller M; Adler G; Abo Riziq A; Rudich Y; Herrmann H; George C; D'Anna B;
Address:		"Universite de Lyon, Universite Lyon 1, Centre National de la Recherche Scientifique, Unite Mixte de Recherche, 5256, IRCELYON, Institut de Recherches sur la Catalyse et l'Environnement de Lyon, F-69626 Villeurbanne, France"
Journal Title:		Proc Natl Acad Sci U S A
Year:		2012
Volume:		20120418
Issue:		18
Page Number:		6840 - 6844
DOI:		10.1073/pnas.1120593109
ISSN/ISBN:		1091-6490 (Electronic) 0027-8424 (Print) 0027-8424 (Linking)
Abstract:		"Credible climate change predictions require reliable fundamental scientific knowledge of the underlying processes. Despite extensive observational data accumulated to date, atmospheric aerosols still pose key uncertainties in the understanding of Earth's radiative balance due to direct interaction with radiation and because they modify clouds' properties. Specifically, major gaps exist in the understanding of the physicochemical pathways that lead to aerosol growth in the atmosphere and to changes in their properties while in the atmosphere. Traditionally, the driving forces for particle growth are attributed to condensation of low vapor pressure species following atmospheric oxidation of volatile compounds by gaseous oxidants. The current study presents experimental evidence of an unaccounted-for new photoinduced pathway for particle growth. We show that heterogeneous reactions activated by light can lead to fast uptake of noncondensable Volatile Organic Compounds (VOCs) at the surface of particles when only traces of a photosensitizer are present in the seed aerosol. Under such conditions, size and mass increase; changes in the chemical composition of the aerosol are also observed upon exposure to volatile organic compounds such as terpenes and near-UV irradiation. Experimentally determined growth rate values match field observations, suggesting that this photochemical process can provide a new, unaccounted-for pathway for atmospheric particle growth and should be considered by models"
Keywords:
Notes:		"PubMed-not-MEDLINEMonge, Maria Eugenia Rosenorn, Thomas Favez, Olivier Muller, Markus Adler, Gabriela Abo Riziq, Ali Rudich, Yinon Herrmann, Hartmut George, Christian D'Anna, Barbara eng Research Support, Non-U.S. Gov't 2012/04/21 Proc Natl Acad Sci U S A. 2012 May 1; 109(18):6840-4. doi: 10.1073/pnas.1120593109. Epub 2012 Apr 18"