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Nature

Title:		Secondary organic aerosol reduced by mixture of atmospheric vapours
Author(s):		McFiggans G; Mentel TF; Wildt J; Pullinen I; Kang S; Kleist E; Schmitt S; Springer M; Tillmann R; Wu C; Zhao D; Hallquist M; Faxon C; Le Breton M; Hallquist AM; Simpson D; Bergstrom R; Jenkin ME; Ehn M; Thornton JA; Alfarra MR; Bannan TJ; Percival CJ; Priestley M; Topping D; Kiendler-Scharr A;
Address:		"School of Earth and Environmental Sciences, University of Manchester, Manchester, UK. Institut fur Energie- und Klimaforschung, IEK-8, Forschungszentrum Julich, Julich, Germany. t.mentel@fz-juelich.de. Institut fur Energie- und Klimaforschung, IEK-8, Forschungszentrum Julich, Julich, Germany. Institut fur Bio- und Geowissenschaften, IBG-2, Forschungszentrum Julich, Julich, Germany. Department of Applied Physics, University of Eastern Finland, Kuopio, Finland. TSI, Aachen, Germany. Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, Sweden. Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences, Fudan University, Shanghai, China. Atmospheric Science, Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden. IVL Swedish Environmental Research Institute, Gothenburg, Sweden. Department of Earth, Space and Environment, Chalmers University of Technology, Gothenburg, Sweden. EMEP MSC-W, Norwegian Meteorological Institute, Oslo, Norway. Swedish Meteorological and Hydrological Institute, Norrkoping, Sweden. Atmospheric Chemistry Services, Okehampton, UK. Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland. Department of Atmospheric Sciences, University of Washington, Seattle, WA, USA. National Centre for Atmospheric Science (NCAS), University of Manchester, Manchester, UK. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA. I. Physikalisches Institut, Universitat zu Koln, Cologne, Germany"
Journal Title:		Nature
Year:		2019
Volume:		20190130
Issue:		7741
Page Number:		587 - 593
DOI:		10.1038/s41586-018-0871-y
ISSN/ISBN:		1476-4687 (Electronic) 0028-0836 (Linking)
Abstract:		"Secondary organic aerosol contributes to the atmospheric particle burden with implications for air quality and climate. Biogenic volatile organic compounds such as terpenoids emitted from plants are important secondary organic aerosol precursors with isoprene dominating the emissions of biogenic volatile organic compounds globally. However, the particle mass from isoprene oxidation is generally modest compared to that of other terpenoids. Here we show that isoprene, carbon monoxide and methane can each suppress the instantaneous mass and the overall mass yield derived from monoterpenes in mixtures of atmospheric vapours. We find that isoprene 'scavenges' hydroxyl radicals, preventing their reaction with monoterpenes, and the resulting isoprene peroxy radicals scavenge highly oxygenated monoterpene products. These effects reduce the yield of low-volatility products that would otherwise form secondary organic aerosol. Global model calculations indicate that oxidant and product scavenging can operate effectively in the real atmosphere. Thus highly reactive compounds (such as isoprene) that produce a modest amount of aerosol are not necessarily net producers of secondary organic particle mass and their oxidation in mixtures of atmospheric vapours can suppress both particle number and mass of secondary organic aerosol. We suggest that formation mechanisms of secondary organic aerosol in the atmosphere need to be considered more realistically, accounting for mechanistic interactions between the products of oxidizing precursor molecules (as is recognized to be necessary when modelling ozone production)"
Keywords:
Notes:		"PubMed-not-MEDLINEMcFiggans, Gordon Mentel, Thomas F Wildt, Jurgen Pullinen, Iida Kang, Sungah Kleist, Einhard Schmitt, Sebastian Springer, Monika Tillmann, Ralf Wu, Cheng Zhao, Defeng Hallquist, Mattias Faxon, Cameron Le Breton, Michael Hallquist, Asa M Simpson, David Bergstrom, Robert Jenkin, Michael E Ehn, Mikael Thornton, Joel A Alfarra, M Rami Bannan, Thomas J Percival, Carl J Priestley, Michael Topping, David Kiendler-Scharr, Astrid eng European Research Council/International Lecture Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. England 2019/02/01 Nature. 2019 Jan; 565(7741):587-593. doi: 10.1038/s41586-018-0871-y. Epub 2019 Jan 30"