期刊
GEOPHYSICAL RESEARCH LETTERS
卷 35, 期 15, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2008GL034058
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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 (O-3 + NO2). The measured oxygenated-organic aerosol correlates with odd oxygen measurements with an apparent slope of (104-180) mu g m(-3) ppmv(-1) (STP) and r(2) > 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 O-3 production until more complete models of SOA formation become available.
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