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Investigation of the correlation between odd oxygen and secondary organic aerosol in Mexico City and Houston
Journal article   Open access   Peer reviewed

Investigation of the correlation between odd oxygen and secondary organic aerosol in Mexico City and Houston

E. C. Wood, M. R. Canagaratna, S. C. Herndon, T. B. Onasch, C. E. Kolb, D. R. Worsnop, J. H. Kroll, W. B. Knighton, R. Seila, M. Zavala, …
Atmospheric chemistry and physics, v 10(18), pp 8947-8968
27 Sep 2010
DOI: https://doi.org/10.5194/acp-10-8947-2010
Featured in Collection :   UN Sustainable Development Goals @ Drexel
url
https://doi.org/10.5194/acp-10-8947-2010View
Published, Version of Record (VoR) Open

Abstract

Environmental Sciences Environmental Sciences & Ecology Life Sciences & Biomedicine Meteorology & Atmospheric Sciences Physical Sciences Science & Technology
Many recent models underpredict secondary organic aerosol (SOA) particulate matter (PM) concentrations in polluted regions, indicating serious deficiencies in the models' chemical mechanisms and/or missing SOA precursors. Since tropospheric photochemical ozone production is much better understood, we investigate the correlation of odd-oxygen ([O-x] [O-3]+[NO2]) and the oxygenated component of organic aerosol (OOA), which is interpreted as a surrogate for SOA. OOA and O-x measured in Mexico City in 2006 and Houston in 2000 were well correlated in air masses where both species were formed on similar timescales (less than 8 h) and not well correlated when their formation timescales or location differed greatly. When correlated, the ratio of these two species ranged from 30 mu g m(-3)/ppm (STP) in Houston during time periods affected by large petrochemical plant emissions to as high as 160 mu g m(-3)/ppm in Mexico City, where typical values were near 120 mu g m(-3)/ppm. On several days in Mexico City, the [OOA]/[O-x] ratio decreased by a factor of similar to 2 between 08: 00 and 13: 00 local time. This decrease is only partially attributable to evaporation of the least oxidized and most volatile components of OOA; differences in the diurnal emission trends and timescales for photochemical processing of SOA precursors compared to ozone precursors also likely contribute to the observed decrease. The extent of OOA oxidation increased with photochemical aging. Calculations of the ratio of the SOA formation rate to the O-x production rate using ambient VOC measurements and traditional laboratory SOA yields are lower than the observed [OOA]/[O-x] ratios by factors of 5 to 15, consistent with several other models' underestimates of SOA. Calculations of this ratio using emission factors for organic compounds from gasoline and diesel exhaust do not reproduce the observed ratio. Although not succesful in reproducing the atmospheric observations presented, modeling P(SOA)/P(O-x) can serve as a useful test of photochemical models using improved formulation mechanisms for SOA.

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106 citations in Web of Science
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UN Sustainable Development Goals (SDGs)

This publication has contributed to the advancement of the following goals:

#3 Good Health and Well-Being
#13 Climate Action
#11 Sustainable Cities and Communities

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Environmental Sciences
Meteorology & Atmospheric Sciences
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