Single-particle characterization of biomass burning organic aerosol (BBOA): Evidence for non-uniform mixing of high molecular weight organics and potassium

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dc.contributor.author Lee, Alex K. Y.
dc.contributor.author Willis, Megan D.
dc.contributor.author Healy, Robert M.
dc.contributor.author Wang, Jon M.
dc.contributor.author Jeong, Cheol-Heon
dc.contributor.author Wenger, John C.
dc.contributor.author Evans, Greg J.
dc.contributor.author Abbatt, Jonathan P. D.
dc.date.accessioned 2017-06-22T13:55:54Z
dc.date.available 2017-06-22T13:55:54Z
dc.date.issued 2016-05-04
dc.identifier.citation Lee, A. K. Y., Willis, M. D., Healy, R. M., Wang, J. M., Jeong, C. H., Wenger, J. C., Evans, G. J. and Abbatt, J. P. D. (2016) 'Single-particle characterization of biomass burning organic aerosol (BBOA): evidence for non-uniform mixing of high molecular weight organics and potassium', Atmospheric Chemistry and Physics, 16, pp.5561-5572. doi: 10.5194/acp-16-5561-2016 en
dc.identifier.volume 16
dc.identifier.startpage 5561
dc.identifier.endpage 5572
dc.identifier.issn 1680-7324
dc.identifier.uri http://hdl.handle.net/10468/4176
dc.identifier.doi 10.5194/acp-16-5561-2016
dc.description.abstract Biomass burning organic aerosol (BBOA) can be emitted from natural forest fires and human activities such as agricultural burning and domestic energy generation. BBOA is strongly associated with atmospheric brown carbon (BrC) that absorbs near-ultraviolet and visible light, resulting in significant impacts on regional visibility degradation and radiative forcing. The mixing state of BBOA can play a critical role in the prediction of aerosol optical properties. In this work, single-particle measurements from a Soot-Particle Aerosol Mass Spectrometer coupled with a light scattering module (LS-SP-AMS) were performed to examine the mixing state of BBOA, refractory black carbon (rBC), and potassium (K, a tracer for biomass burning aerosol) in an air mass influenced by wildfire emissions transported from northern Québec to Toronto, representing aged biomass burning plumes. Cluster analysis of single-particle measurements identified five BBOA-related particle types. rBC accounted for 3–14 wt % of these particle types on average. Only one particle type exhibited a strong ion signal for K+, with mass spectra characterized by low molecular weight organic species. The remaining four particle types were classified based on the apparent molecular weight of the BBOA constituents. Two particle types were associated with low potassium content and significant amounts of high molecular weight (HMW) organic compounds. Our observations indicate non-uniform mixing of particles within a biomass burning plume in terms of molecular weight and illustrate that HMW BBOA can be a key contributor to low-volatility BrC observed in BBOA particles. The average mass absorption efficiency of low-volatility BBOA is about 0.8–1.1 m2 g−1 based on a theoretical closure calculation. Our estimates indicate that low-volatility BBOA contributes ∼ 33–44 % of thermo-processed particle absorption at 405 nm; and almost all of the BBOA absorption was associated with low-volatility organics. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher European Geosciences Union en
dc.relation.uri http://www.atmos-chem-phys.net/16/5561/2016/
dc.rights © 2016, the Author(s). This work is distributed under the Creative Commons Attribution 3.0 License. en
dc.rights.uri https://creativecommons.org/licenses/by/3.0/ en
dc.subject Biomass burning organic aerosol (BBOA) en
dc.subject Organic compounds en
dc.title Single-particle characterization of biomass burning organic aerosol (BBOA): Evidence for non-uniform mixing of high molecular weight organics and potassium en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Robert M. Healy, Chemistry and Environmental Research Institute, University College Cork, Cork, Ireland. +353-21-490-3000 Email: robert.healy@ucc.ie en
dc.internal.availability Full text available en
dc.description.version Published Version en
dc.contributor.funder Natural Sciences and Engineering Research Council of Canada
dc.contributor.funder Canada Foundation for Innovation
dc.contributor.funder FP7 People: Marie-Curie Actions
dc.description.status Peer reviewed en
dc.identifier.journaltitle Atmospheric Chemistry and Physics en
dc.internal.IRISemailaddress robert.healy@ucc.ie en
dc.relation.project info:eu-repo/grantAgreement/EC/FP7::SP3::PEOPLE/299755/EU/Chemical and Optical Properties of Black Carbon Particles/CHEMBC


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© 2016, the Author(s). This work is distributed under the Creative Commons Attribution 3.0 License. Except where otherwise noted, this item's license is described as © 2016, the Author(s). This work is distributed under the Creative Commons Attribution 3.0 License.
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