Journal ArticleDOI
Particle phase acidity and oligomer formation in secondary organic aerosol.
Song Gao,Nga L. Ng,Melita Keywood,Varuntida Varutbangkul,Roya Bahreini,Athanasios Nenes,Jiwen He,Kee Y. Yoo,Jesse L. Beauchamp,Robert Hodyss,Richard C. Flagan,John H. Seinfeld +11 more
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TLDR
As the seed particle acidity increases, larger oligomers are formed more abundantly in the SOA; consequently, the overall SOA yield also increases, and this explicit effect of particle phase acidity on the composition and yield of SOA may have important climatic consequences and need to be considered in relevant models.Abstract:
A series of controlled laboratory experiments are carried out in dual Teflon chambers to examine the presence of oligomers in secondary organic aerosols (SOA) from hydrocarbon ozonolysis as well as to explore the effect of particle phase acidity on SOA formation. In all seven hydrocarbon systems studied (i.e., α-pinene, cyclohexene, 1-methyl cyclopentene, cycloheptene, 1-methyl cyclohexene, cyclooctene, and terpinolene), oligomers with MW from 250 to 1600 are present in the SOA formed, both in the absence and presence of seed particles and regardless of the seed particle acidity. These oligomers are comparable to, and in some cases, exceed the low molecular weight species (MW < 250) in ion intensities in the ion trap mass spectra, suggesting they may comprise a substantial fraction of the total aerosol mass. It is possible that oligomers are widely present in atmospheric organic aerosols, formed through acid- or base-catalyzed heterogeneous reactions. In addition, as the seed particle acidity increases, larger oligomers are formed more abundantly in the SOA; consequently, the overall SOA yield also increases. This explicit effect of particle phase acidity on the composition and yield of SOA may have important climatic consequences and need to be considered in relevant models.read more
Citations
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Journal ArticleDOI
The formation, properties and impact of secondary organic aerosol: current and emerging issues
Mattias Hallquist,John C. Wenger,Urs Baltensperger,Yinon Rudich,David Simpson,David Simpson,Magda Claeys,J. Dommen,Neil M. Donahue,Christian George,Christian George,Allen H. Goldstein,Jacqueline F. Hamilton,Hartmut Herrmann,Thorsten Hoffmann,Yoshiteru Iinuma,Myoseon Jang,Michael E. Jenkin,Jose L. Jimenez,Astrid Kiendler-Scharr,Willy Maenhaut,Gordon McFiggans,Th. F. Mentel,Anne Monod,André S. H. Prévôt,John H. Seinfeld,Jason D. Surratt,Rafal Szmigielski,Jürgen Wildt +28 more
TL;DR: In this article, an overview of the atmospheric degradation mechanisms for SOA precursors, gas-particle partitioning theory and analytical techniques used to determine the chemical composition of SOA is presented.
Journal ArticleDOI
Organic aerosol and global climate modelling: a review
Maria Kanakidou,John H. Seinfeld,Spyros N. Pandis,Ian Barnes,Frank Dentener,Maria Cristina Facchini,R. Van Dingenen,Barbara Ervens,Athanasios Nenes,Claus J. Nielsen,Erik Swietlicki,J. P. Putaud,Yves Balkanski,Sandro Fuzzi,J. Horth,Geert K. Moortgat,R. Winterhalter,Cathrine Lund Myhre,Kostas Tsigaridis,Elisabetta Vignati,Euripides G. Stephanou,J. Wilson +21 more
TL;DR: In this article, the authors reviewed existing knowledge with regard to organic aerosol (OA) of importance for global climate modelling and defined critical gaps needed to reduce the involved uncertainties, and synthesized the information to provide a continuous analysis of the flow from the emitted material to the atmosphere up to the point of the climate impact of the produced organic aerosols.
Journal ArticleDOI
Chemistry of secondary organic aerosol: Formation and evolution of low-volatility organics in the atmosphere
Jesse H. Kroll,John H. Seinfeld +1 more
TL;DR: A review of the chemistry of the formation and continuing transformation of low-volatility species in the atmosphere can be found in this article, where the primary focus is chemical processes that can change the volatility of organic compounds: oxidation reactions in the gas phase, reaction in the particle phase, and reaction in either phase over several generations.
Journal ArticleDOI
Aerosol cloud precipitation interactions. Part 1. The nature and sources of cloud-active aerosols
TL;DR: In this article, the authors discuss the role of chemical composition and particle size in cloud condensation nucleation processes, and the role that the chemical composition plays in the process of cloud droplet and ice nucleation.
Journal ArticleDOI
Organic aerosol components observed in Northern Hemispheric datasets from Aerosol Mass Spectrometry
Nga L. Ng,Manjula R. Canagaratna,Qi Zhang,Qi Zhang,Jose L. Jimenez,Jian Tian,Ingrid M. Ulbrich,Jesse H. Kroll,Kenneth S. Docherty,P. S. Chhabra,Roya Bahreini,Roya Bahreini,Shane M. Murphy,John H. Seinfeld,Lea Hildebrandt,Neil M. Donahue,Peter F. DeCarlo,Peter F. DeCarlo,V. A. Lanz,André S. H. Prévôt,E. Dinar,Yinon Rudich,D. R. Worsnop +22 more
TL;DR: In this article, the authors present results from the factor analysis of 43 AMS datasets (27 of the datasets are reanalyzed in this work) and provide a holistic overview of Northern Hemisphere organic aerosol (OA) and its evolution in the atmosphere.
References
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TL;DR: If acid-catalyzed heterogeneous reactions of SOA products are included in current models, the predicted SOA formation will be much greater and could have a much larger impact on climate forcing effects than the authors now predict.
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