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The Correlation of Secondary Organic Aerosol with Odd Oxygen in Mexico City
Citation:
Herndon, S. C., T. B. Onasch, E. C. Wood, J. H. KROLL, M. R. Canagaratna, J. T. Jayne, M. A. Zavala, W. Knighton, C. Massoleni, M. K. Dubey, I. M. Ulbrich, J. L. JIMENEZ, R. L. SEILA, J. A. de Gouw, B. de Foy, J. Fast, L. T. Molina, C. E. KOLB, AND D. R. WORSNOP. The Correlation of Secondary Organic Aerosol with Odd Oxygen in Mexico City. GEOPHYSICAL RESEARCH LETTERS. American Geophysical Union, Washington, DC, 35(L15804):1-6, (2008).
Impact/Purpose:
The National Exposure Research Laboratory′s (NERL) Human Exposure and Atmospheric Sciences Division (HEASD) conducts research in support of EPA′s mission to protect human health and the environment. HEASD′s research program supports Goal 1 (Clean Air) and Goal 4 (Healthy People) of EPA′s strategic plan. More specifically, our division conducts research to characterize the movement of pollutants from the source to contact with humans. Our multidisciplinary research program produces Methods, Measurements, and Models to identify relationships between and characterize processes that link source emissions, environmental concentrations, human exposures, and target-tissue dose. The impact of these tools is improved regulatory programs and policies for EPA.
Description:
Data from a mountain location intercepting the Mexico City emission plume demonstrate 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) μm-3 ppmv -1 (STP) and r2 >0.9.
