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GEOPHYSICAL RESEARCH LETTERS,
VOL. 35,
L15804,
doi:10.1029/2008GL034058,
2008
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
Abstract
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.
Keywords: secondary organic aerosol;
photochemistry;
urban.
Index Terms: 0305 Atmospheric Composition and Structure: Aerosols and particles (0345, 4801, 4906); 0325 Atmospheric Composition and Structure: Evolution of the atmosphere (1610, 8125); 0345 Atmospheric Composition and Structure: Pollution: urban and regional (0305, 0478, 4251); 0365 Atmospheric Composition and Structure: Troposphere: composition and chemistry; 0317 Atmospheric Composition and Structure: Chemical kinetic and photochemical properties.
Read Full Article (file size: 472472 bytes) Cited by
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.
Copyright 2008 by the American Geophysical Union.
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