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Published September 2011 | Published
Journal Article Open

Analysis of photochemical and dark glyoxal uptake: Implications for SOA formation


The dependence of glyoxal uptake onto deliquesced ammonium sulfate seed aerosol was studied under photochemical (light + hydroxyl radical (OH)) and dark conditions. In this study, the chemical composition of aerosol formed from glyoxal is identical in the presence or absence of OH. In addition, there was no observed OH dependence on either glyoxal uptake or glyoxal-driven aerosol growth for this study. These findings demonstrate that, for the system used here, glyoxal uptake is not affected by the presence of OH. In combination with previous studies, this shows that the exact nature of the type of seed aerosol, in particular the presence of a coating, has a large influence on fast photochemical uptake of glyoxal. Due to the challenge of relating this seed aerosol dependence to ambient conditions, this work highlights the resulting difficulty in quantitatively including SOA formation from glyoxal in models.

Additional Information

© 2011 American Geophysical Union. Received 23 June 2011; revised 15 August 2011; accepted 23 August 2011; published 15 September 2011. The authors thank Rainer Volkamer for helpful discussions prior to publication. This work was supported by the National Science Foundation, Division of Atmospheric Sciences, Atmospheric Chemistry Program (grants 1026667, 0852406), US Department of Energy grant DE‐FG02‐05ER63 983 and US Environmental Protection Agency STAR grant RD‐83 374 901. It has not been formally reviewed by the EPA. The views expressed in this document are solely those of the authors and the EPA does not endorse any products in this publication. The Editor thanks two anonymous reviewers for their assistance in evaluating this paper.

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Published - Galloway2011p16034Geophys_Res_Lett.pdf


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