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Journal of Geophysical Research: Atmospheres

Organic aerosol composition and sources in Pasadena, California, during the 2010 CalNex campaign

Authors

  • P. L. Hayes,

    1. Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, Boulder, Colorado, USA
    2. Department of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, Colorado, USA
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  • A. M. Ortega,

    1. Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, Boulder, Colorado, USA
    2. Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, Colorado, USA
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  • M. J. Cubison,

    1. Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, Boulder, Colorado, USA
    2. Department of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, Colorado, USA
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  • K. D. Froyd,

    1. Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, Boulder, Colorado, USA
    2. NOAA Chemical Sciences Division, Boulder, Colorado, USA
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  • Y. Zhao,

    1. Air Quality Research Center, University of California, Davis, California, USA
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  • S. S. Cliff,

    1. Air Quality Research Center, University of California, Davis, California, USA
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  • W. W. Hu,

    1. Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, Boulder, Colorado, USA
    2. College of Environmental Sciences and Engineering, Peking University, Beijing, China
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  • D. W. Toohey,

    1. Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, Colorado, USA
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  • J. H. Flynn,

    1. Department of Earth and Atmospheric Sciences, University of Houston, Houston, Texas, USA
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  • B. L. Lefer,

    1. Department of Earth and Atmospheric Sciences, University of Houston, Houston, Texas, USA
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  • N. Grossberg,

    1. Department of Earth and Atmospheric Sciences, University of Houston, Houston, Texas, USA
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  • S. Alvarez,

    1. Department of Earth and Atmospheric Sciences, University of Houston, Houston, Texas, USA
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  • B. Rappenglück,

    1. Department of Earth and Atmospheric Sciences, University of Houston, Houston, Texas, USA
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  • J. W. Taylor,

    1. School of Earth, Atmospheric, and Environmental Sciences, University of Manchester, Manchester, UK
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  • J. D. Allan,

    1. School of Earth, Atmospheric, and Environmental Sciences, University of Manchester, Manchester, UK
    2. National Centre for Atmospheric Science, University of Manchester, Manchester, UK
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  • J. S. Holloway,

    1. Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, Boulder, Colorado, USA
    2. NOAA Chemical Sciences Division, Boulder, Colorado, USA
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  • J. B. Gilman,

    1. Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, Boulder, Colorado, USA
    2. NOAA Chemical Sciences Division, Boulder, Colorado, USA
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  • W. C. Kuster,

    1. NOAA Chemical Sciences Division, Boulder, Colorado, USA
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  • J. A. de Gouw,

    1. Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, Boulder, Colorado, USA
    2. NOAA Chemical Sciences Division, Boulder, Colorado, USA
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  • P. Massoli,

    1. Aerodyne Research Inc., Billerica, Massachusetts, USA
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  • X. Zhang,

    1. Georgia Institute of Technology, Atlanta, Georgia, USA
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  • J. Liu,

    1. Georgia Institute of Technology, Atlanta, Georgia, USA
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  • R. J. Weber,

    1. Georgia Institute of Technology, Atlanta, Georgia, USA
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  • A. L. Corrigan,

    1. Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, USA
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  • L. M. Russell,

    1. Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, USA
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  • G. Isaacman,

    1. Department of Environmental Science, Policy and Management, University of California, Berkeley, California, USA
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  • D. R. Worton,

    1. Department of Environmental Science, Policy and Management, University of California, Berkeley, California, USA
    2. Aerosol Dynamics Inc., Berkeley, California, USA
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  • N. M. Kreisberg,

    1. Aerosol Dynamics Inc., Berkeley, California, USA
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  • A. H. Goldstein,

    1. Department of Environmental Science, Policy and Management, University of California, Berkeley, California, USA
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  • R. Thalman,

    1. Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, Boulder, Colorado, USA
    2. Department of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, Colorado, USA
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  • E. M. Waxman,

    1. Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, Boulder, Colorado, USA
    2. Department of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, Colorado, USA
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  • R. Volkamer,

    1. Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, Boulder, Colorado, USA
    2. Department of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, Colorado, USA
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  • Y. H. Lin,

    1. Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
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  • J. D. Surratt,

    1. Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
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  • T. E. Kleindienst,

    1. U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA
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  • J. H. Offenberg,

    1. U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA
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  • S. Dusanter,

    1. Center for Research in Environmental Science, School of Public and Environmental Affairs, and Department of Chemistry, Indiana University, Bloomington, Indiana, USA
    2. Université Lille Nord de France, Lille, France
    3. EMDouai, Douai, France
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  • S. Griffith,

    1. Center for Research in Environmental Science, School of Public and Environmental Affairs, and Department of Chemistry, Indiana University, Bloomington, Indiana, USA
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  • P. S. Stevens,

    1. Center for Research in Environmental Science, School of Public and Environmental Affairs, and Department of Chemistry, Indiana University, Bloomington, Indiana, USA
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  • J. Brioude,

    1. Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, Boulder, Colorado, USA
    2. NOAA Chemical Sciences Division, Boulder, Colorado, USA
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  • W. M. Angevine,

    1. Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, Boulder, Colorado, USA
    2. NOAA Chemical Sciences Division, Boulder, Colorado, USA
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  • J. L. Jimenez

    Corresponding author
    1. Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, Boulder, Colorado, USA
    2. Department of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, Colorado, USA
    • Corresponding author: J. L. Jimenez, Cooperative Institute for Research in the Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309, USA. (jose.jimenez@colorado.edu)

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Abstract

[1] Organic aerosols (OA) in Pasadena are characterized using multiple measurements from the California Research at the Nexus of Air Quality and Climate Change (CalNex) campaign. Five OA components are identified using positive matrix factorization including hydrocarbon-like OA (HOA) and two types of oxygenated OA (OOA). The Pasadena OA elemental composition when plotted as H : C versus O : C follows a line less steep than that observed for Riverside, CA. The OOA components from both locations follow a common line, however, indicating similar secondary organic aerosol (SOA) oxidation chemistry at the two sites such as fragmentation reactions leading to acid formation. In addition to the similar evolution of elemental composition, the dependence of SOA concentration on photochemical age displays quantitatively the same trends across several North American urban sites. First, the OA/ΔCO values for Pasadena increase with photochemical age exhibiting a slope identical to or slightly higher than those for Mexico City and the northeastern United States. Second, the ratios of OOA to odd-oxygen (a photochemical oxidation marker) for Pasadena, Mexico City, and Riverside are similar, suggesting a proportional relationship between SOA and odd-oxygen formation rates. Weekly cycles of the OA components are examined as well. HOA exhibits lower concentrations on Sundays versus weekdays, and the decrease in HOA matches that predicted for primary vehicle emissions using fuel sales data, traffic counts, and vehicle emission ratios. OOA does not display a weekly cycle—after accounting for differences in photochemical aging —which suggests the dominance of gasoline emissions in SOA formation under the assumption that most urban SOA precursors are from motor vehicles.

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