Molecular Composition and Volatility of Organic Aerosol in the

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Molecular composition and volatility of organic aerosol in the Southeastern U.S.: implications for IEPOX derived SOA Felipe Lopez-Hilfiker, Claudia Mohr, Emma L. D'Ambro, Anna Lutz, Theran P. Riedel, Cassandra J. Gaston, Siddharth Iyer, Zhenfa Zhang, Avram Gold, Jason Douglas Surratt, Ben Hwan Lee, Theo Kurtén, Weiwei Hu, Jose Luis Jimenez, Mattias Hallquist, and Joel A. Thornton Environ. Sci. Technol., Just Accepted Manuscript • DOI: 10.1021/acs.est.5b04769 • Publication Date (Web): 26 Jan 2016 Downloaded from http://pubs.acs.org on January 30, 2016

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Environmental Science & Technology

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Molecular composition and volatility of organic aerosol in the

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Southeastern U.S.: implications for IEPOX derived SOA

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F. D. Lopez-Hilfiker1, C. Mohr1,+, E. L. D’Ambro2, A. Lutz3, T. P. Riedel4, C. J. Gaston1, S. Iyer5, Z. Zhang4, A. Gold4, J. D. Surratt4, B. H. Lee1, T. Kurten5, W.W. Hu6,7, J. Jimenez6,7, M. Hallquist3, J. A. Thornton1*

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Department of Atmospheric Sciences, University of Washington, Seattle, WA, 98195, USA

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Department of Chemistry, University of Washington, Seattle, WA, 98195, USA

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Department of Chemistry, University of Helsinki, Helsinki, Finland

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Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO, USA

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Cooerative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA

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* To whom correspondence should be addressed:

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KEYWORDS: SOA, FIGAERO, TOF-CIMS, IEPOX, Organic aerosol, Isoprene SOA, Accretion Products

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Abstract. We present measurements as part of the Southern Oxidant and Aerosol Study (SOAS)

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during which atmospheric aerosol particles were comprehensively characterized. We present

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results utilizing a Filter Inlet for Gases and AEROsol coupled to a chemical ionization mass

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spectrometer (CIMS). We focus on the volatility and composition of isoprene derived organic

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aerosol tracers and of the bulk organic aerosol. By utilizing the online volatility and molecular

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composition information provided by the FIGAERO-CIMS, we show that the vast majority of

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commonly reported molecular tracers of isoprene epoxydiol (IEPOX) derived secondary organic

Department of Chemistry and Molecular Biology, University of Gothenburg, 412 96 Gothenburg, Sweden

Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA

Now at: Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, 76344 EggensteinLeopoldshafen, Germany

ACS Paragon Plus Environment

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Environmental Science & Technology

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aerosol (SOA) is derived from thermal decomposition of accretion products or other low

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volatility organics having effective saturation vapor concentrations