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AGU: Geophysical Research Letters

 

Keywords

  • secondary organic aerosol
  • photochemistry
  • urban

Index Terms

  • Atmospheric Composition and Structure: Aerosols and particles
  • Atmospheric Composition and Structure: Evolution of the atmosphere
  • Atmospheric Composition and Structure: Pollution: urban and regional
  • Atmospheric Composition and Structure: Troposphere: composition and chemistry
  • Atmospheric Composition and Structure: Chemical kinetic and photochemical properties

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 35, L15804, 6 PP., 2008
doi:10.1029/2008GL034058

Correlation of secondary organic aerosol with odd oxygen in Mexico City

Scott C. Herndon

Aerodyne Research, Inc., Billerica, Massachusetts, USA

Timothy B. Onasch

Aerodyne Research, Inc., Billerica, Massachusetts, USA

Ezra C. Wood

Aerodyne Research, Inc., Billerica, Massachusetts, USA

Jesse H. Kroll

Aerodyne Research, Inc., Billerica, Massachusetts, USA

Manjula R. Canagaratna

Aerodyne Research, Inc., Billerica, Massachusetts, USA

John T. Jayne

Aerodyne Research, Inc., Billerica, Massachusetts, USA

Miguel A. Zavala

Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

Molina Center for Energy and the Environment, La Jolla, California, USA

W. Berk Knighton

Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana, USA

Claudio Mazzoleni

Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico, USA

Manvendra K. Dubey

Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico, USA

Ingrid M. Ulbrich

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

Jose L. Jimenez

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

Robert Seila

National Exposure Research Laboratory, Environmental Protection Agency, Research Triangle Park, North Carolina, USA

Joost A. de Gouw

Earth System Research Laboratory, NOAA, Boulder, Colorado, USA

Benjamin de Foy

Department of Earth and Atmospheric Sciences, Saint Louis University, St. Louis, Missouri, USA

Jerome Fast

Pacific Northwest National Laboratory, Richland, Washington, USA

Luisa T. Molina

Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

Molina Center for Energy and the Environment, La Jolla, California, USA

Charles E. Kolb

Aerodyne Research, Inc., Billerica, Massachusetts, USA

Douglas R. Worsnop

Aerodyne Research, Inc., Billerica, Massachusetts, USA

Photochemically processed urban emissions were characterized at a mountain top location, free from local sources, within the Mexico City Metropolitan Area. Analysis of the Mexico City emission plume demonstrates a strong correlation between secondary organic aerosol and odd oxygen (O3 + NO2). The measured oxygenated-organic aerosol correlates with odd oxygen measurements with an apparent slope of (104–180) μg m−3 ppmv−1 (STP) and r2 > 0.9. The dependence of the observed proportionality on the gas-phase hydrocarbon profile is discussed. The observationally-based correlation between oxygenated organic aerosol mass and odd oxygen may provide insight into poorly understood secondary organic aerosol production mechanisms by leveraging knowledge of gas-phase ozone production chemistry. These results suggest that global and regional models may be able to use the observed proportionality to estimate SOA as a co-product of modeled O3 production until more complete models of SOA formation become available.

Received 22 March 2008; accepted 20 June 2008; published 5 August 2008.

Citation: Herndon, S. C., et al. (2008), Correlation of secondary organic aerosol with odd oxygen in Mexico City, Geophys. Res. Lett., 35, L15804, doi:10.1029/2008GL034058.

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