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The role of sulphates and organic vapours in growth of newly formed particles in a eucalypt forest

Ristovski, Zoran, Suni, Tanja , Kulmala, Markku , Boy, M. , Meyer, Nickolas K., Duplissy, Jonathan , Turnipseed, Andrew , Morawska, Lidia, & Baltensperger, Urs (2010) The role of sulphates and organic vapours in growth of newly formed particles in a eucalypt forest. Atmospheric Chemistry and Physics, 10(6), pp. 2919-2926.

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Abstract

The influence of biogenic particle formation on climate is a well recognised phenomenon. To understand the mechanisms underlying the biogenic particle formation, determining the chemical composition of the new particles and therefore the species that drive the particle production is of utmost importance. Due to the very small amount of mass involved, indirect approaches are frequently used to infer the composition. We present here the results of such an indirect approach by simultaneously measuring volatile and hygroscopic properties of newly formed particles in a forest environment. It is shown that the particles are composed of both sulphates and organics, with the amount of sulphate component strongly depending on the available gas-phase sulphuric acid, and the organic components having the same volatility and hygroscopicity as photooxidation products of a monoterpene such as α-pinene. Our findings agree with a two-step process through nucleation and cluster formation followed by simultaneous growth by condensation of sulphates and organics that take the particles to climatically relevant sizes.

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13 citations in Web of Science®

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71 since deposited on 19 Nov 2010
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ID Code: 38659
Item Type: Journal Article
Keywords: Sulphates, Organic Vapours, New Particle Formation, Eucalypt Forests
DOI: 10.5194/acp-10-2919-2010
ISSN: 1680-7316
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > ATMOSPHERIC SCIENCES (040100) > Atmospheric Aerosols (040101)
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > ATMOSPHERIC SCIENCES (040100) > Atmospheric Sciences not elsewhere classified (040199)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute of Health and Biomedical Innovation
Past > Schools > Physics
Copyright Owner: © Copyright 2010 the Authors.
Deposited On: 19 Nov 2010 16:46
Last Modified: 01 Mar 2012 00:23

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