10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Formation of Sulfate during Winter High Pollution Events in Beijing
Peng Wang, Li Wu, QI YING, Jianlin Hu, Hongliang Zhang, Texas A&M University
Abstract Number: 1634 Working Group: Aerosol Chemistry
Abstract Sulfate is a major aerosol component in severe winter haze events in many areas across China. Debates on the importance of various pathways of S(IV) to S(VI) oxidation, including gas and aqueous reactions as well as heterogeneous reactions have been ongoing without a clear consensus. Recently, the importance of the aqueous phase oxidation by NO2 and by O2 catalyzed by transition metals is being extensively discussed. In this study, we applied a modified CMAQ model to evaluate the contributions of these different pathways to sulfate formation in January 2013 when daily average sulfate concentration reached more than 100 µg m-3. A sulfate formation tracking method based on the source-oriented modeling approach is implemented to track sulfate from different pathways. To have a better understand of the vertical distribution of the sulfate formation rate, the source-oriented approach also keeps track of sulfate formation of different vertical layers. By doing this detailed modeling exercise, we aim to provide more detailed understanding of the sulfate formation processes in the region.