Anthropogenic Secondary Organic Aerosol and Ozone from Asphalt-Related Emissions
KARL SELTZER, Venkatesh Rao, Havala Pye, Benjamin Murphy, Bryan Place, Peeyush Khare, Drew Gentner, Chris Allen, David Cooley, Rich Mason, Marc Houyoux,
U.S. EPA Abstract Number: 71
Working Group: Aerosol Sources and Constituents of Emerging Importance and Their Impacts across Spatial Scales
AbstractAdvances in observational techniques have provided an unprecedented view into the chemical composition of organic emissions. This includes highly detailed chemical characterization of gas-phase organics in the semi-to-intermediate volatility range, which are efficient secondary organic aerosol (SOA) precursors and have historically been neglected in emissions inventories used for air quality modeling applications. Recent work has identified reactive organic carbon from asphalt as a considerable and previously unaccounted source of SOA precursor emissions in urban areas. Here, we leverage source measurements from recent work to construct a bottom-up inventory of asphalt-related emissions for the United States. Our bottom-up inventory includes hot- and cold-mix application processes, as well as emissions from roofing-related asphalt materials. We then comprehensively reflect our inventory in the Community Multiscale Air Quality (CMAQ) model using the newly developed Community Regional Atmospheric Chemistry Multiphase Mechanism (CRACMM) to quantify the subsequent enhancements in anthropogenic SOA and ozone resolved throughout the United States.