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Webinar: What happens to air pollution when it is cold and dark? Insights from the Wintertime Investigation of Transport, Emissions, and Reactivity (WINTER) Campaign

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Monday, 27 November 2017, 5:30

Monday, November 27, 2017. 5:30PM Eastern Time. Webinar: What happens to air pollution when it is cold and dark? Insights from the Wintertime Investigation of Transport, Emissions, and Reactivity (WINTER) Campaign. Joel Thornton, University of Washington. Sponsored by NCAR| UCAR. More information here.

 

Emissions of primary pollutants occur year-round. Episodes of significantly degraded air quality can occur during wintertime in mid-latitude urban areas. Yet, the rates and mechanisms by which primary pollutants are transformed under the darker and colder conditions of winter remain poorly understood. I will present on forthcoming results obtained from the Wintertime Investigation of Transport, Emissions, and Reactivity (WINTER) Campaign, which utilized the NSF/NCAR C-130 aircraft to study trace gas and particulate emissions and chemistry across the eastern U.S. during February - March 2015. These observations suggest significant photochemical oxidation occurs, driven by radical precursors not commonly incorporated in chemical transport models, that are strongly linked to local and regional anthropogenic emissions of nitrogen oxides and short-lived VOC. We find that by reconciling model representations of multiphase reactive nitrogen chemistry, related radical precursors and formaldehyde emission sources are consistent with observations.  This allows for an accurate description of secondary nitrate and sulfate aerosol formation and reactive nitrogen partitioning and deposition, which in turn allows for more robust predictions of responses to future changes in emissions.

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