References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-10-8947-2010

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

Wood

E. C.

¹ Canagaratna

M. R.

¹ Herndon

S. C.

¹ Onasch

T. B.

¹ Kolb

C. E.

¹ Worsnop

D. R.

¹ Kroll

J. H.

¹ ¹² Knighton

W. B.

² Seila

³ Zavala

⁴ Molina

L. T.

⁴ DeCarlo

P. F.

⁵ ⁶ ¹³ Jimenez

J. L.

⁵ ⁶ ⁷ Weinheimer

A. J.

⁸ Knapp

D. J.

⁸ Jobson

B. T.

⁹ Stutz

¹⁰ Kuster

W. C.

¹¹ Williams

E. J.

¹¹

Aerodyne Research, Inc., Billerica, Massachusetts, USA

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

United States Environmental Protection Agency, Research Triangle Park, North Carolina, USA

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

Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, Colorado, USA

Cooperative Institute for Research in the Environmental Sciences (CIRES), University of Colorado, Boulder, Colorado, USA

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

National Center for Atmospheric Research, Boulder Colorado, USA

Department of Civil and Environmental Engineering, Washington State University, Pullman, Washington, USA

Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California, USA

NOAA Earth System Research Laboratory, Boulder, Colorado, USA

now at: Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

now at: Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Switzerland

27 09 2010

10 18 8947 8968

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

This article is available from http://www.atmos-chem-phys.net/10/8947/2010/acp-10-8947-2010.html

The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/8947/2010/acp-10-8947-2010.pdf

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 ([Ox]≡[O3]+[NO2]) and the oxygenated component of organic aerosol (OOA), which is interpreted as a surrogate for SOA. OOA and Ox 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 μg m−3/ppm (STP) in Houston during time periods affected by large petrochemical plant emissions to as high as 160 μg m−3/ppm in Mexico City, where typical values were near 120 μg m−3/ppm. On several days in Mexico City, the [OOA]/[Ox] ratio decreased by a factor of ~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 Ox production rate using ambient VOC measurements and traditional laboratory SOA yields are lower than the observed [OOA]/[Ox] 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(Ox) can serve as a useful test of photochemical models using improved formulation mechanisms for SOA.

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