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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 08 Apr 2019

Research article | 08 Apr 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Chamber-based insights into the factors controlling IEPOX SOA yield, composition, and volatility

Emma L. D'Ambro1,2, Siegfried Schobesberger1,3, Cassandra J. Gaston1,a, Felipe D. Lopez-Hilfiker1,b, Ben H. Lee1, Jiumeng Liu4,c, Alla Zelenyuk5, David Bell5,d, Christopher D. Cappa6,7, Taylor Helgestad6,e, Ziyue Li7, Alex Guenther5,f, Jian Wang8,g, Matthew Wise9, Ryan Caylor9, Jason D. Surratt10, Theran Riedel10, Noora Hyttinen11,h, Vili-Taneli Salo11, Galib Hasan11, Theo Kurtén11, John E. Shilling4, and Joel A. Thornton1,2 Emma L. D'Ambro et al.
  • 1Department of Atmospheric Sciences, University of Washington, Seattle WA, USA
  • 2Department of Chemistry, University of Washington, Seattle WA, USA
  • 3Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
  • 4Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland WA, USA
  • 5Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland WA, USA
  • 6Department of Civil and Environmental Engineering, University of California, Davis CA, USA
  • 7Atmospheric Science Graduate Group, University of California, Davis CA, USA
  • 8Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton NY, USA
  • 9Department of Math and Science, Concordia University, Portland OR, USA
  • 10Department of Environmental Sciences and Engineering, Gillings School of Global and Public Health, University of North Carolina, Chapel Hill NC, USA
  • 11Department of Chemistry and Institute for Atmospheric and Earth System Research (INAR), University of Helsinki, Helsinki, Finland
  • anow at: Rosenstiel School of Marine & Atmospheric Science, University of Miami FL, USA
  • bnow at: TofWerk AG, Thun, Switzerland
  • cnow at: School of Environment, Harbin Institute of Technology, Harbin, Heilongjiang, China
  • dnow at: Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, PSI-Villigen, Switzerland
  • enow at: California Air Resources Board, Sacramento CA, USA
  • fnow at: Department of Earth System Science, University of California, Irvine, USA
  • gnow at: Center for Aerosol Science and Engineering, Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis MO, USA
  • hnow at: Nano and Molecular Systems Research Unit, University of Oulu, Oulu, Finland

Abstract. We present measurements utilizing the Filter Inlet for Gases and Aerosols (FIGAERO) applied to chamber measurements of isoprene-derived epoxydiol (IEPOX) reactive uptake to aqueous acidic particles and associated SOA formation. Similar to recent field observations with the same instrument, we detect two molecular components desorbing from the IEPOX SOA in high abundance: C5H12O4 and C5H10O3. The thermal desorption signal of the former, presumably 2-methyltetrols, exhibits two distinct maxima, suggesting it arises from at least two different SOA components with significantly different effective volatilities. Isothermal evaporation experiments illustrate that the most abundant component giving rise to C5H12O4 is semi-volatile, undergoing nearly complete evaporation within 1 hour, while the second, less volatile, component remains unperturbed and even increases in abundance. We thus confirm, using controlled laboratory studies, recent analyses of ambient SOA measurements showing that IEPOX SOA is of very low volatility and commonly measured IEPOX SOA tracers, such as 2-methyltetrols and C5-alkene triols, result predominantly from artifacts of measurement techniques associated with thermal decomposition and/or hydrolysis. We further show that IEPOX SOA volatility continues to evolve via acidity enhanced accretion chemistry on the timescale of hours, potentially involving both 2-methyltetrols and organosulfates.

Emma L. D'Ambro et al.
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Emma L. D'Ambro et al.
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Publications Copernicus
Short summary
Isoprene is the most abundantly emitted reactive organic gas globally, thus it is important to understand its fate and role in aerosol formation and growth. A major product of its oxidation is an epoxy diol, IEPOX, which can be efficiently taken up by acidic aerosol to generate substantial amounts of secondary organic aerosol (SOA). We present chamber experiments exploring the properties of the IEPOX SOA and reconcile discrepancies between field, laboratory, and model studies of this process.
Isoprene is the most abundantly emitted reactive organic gas globally, thus it is important to...