Studies on Aerosol Impacts on Climate and Health

Speaker:Dr. Suzanne Paulson,
Department of Civil and Environmental Engineering,
UCLAAbstract:1. Optical Properties, Measurement Uncertainties, and Health Impacts of Aerosol Particles
Black carbon and organic carbon aerosols have substantial effects on the Earth's climate, yet because of large uncertainties in both the optical properties, mass measurements and emissions of these materials, their impacts cannot be quantified with any accuracy. We are studying a series of model aerosols generated under realistic conditions using small engines and photochemical smog in a roof-top Teflon reaction chamber. Aerosols are characterized with an extensive suite of techniques including in situ optical and off-line optical to off-line mass and composition analyzers. Among these instruments is a new instrument to measure aerosol angular scattering. From this measurement we are developing a method to retrieve aerosol refractive indices from the data using a genetic algorithms approach.2. Aerosol Production of Hydrogen Peroxide
Recent epidemiological studies have shown a strong relationship between particulate pollution and health outcomes, including mortality. Determining the 'causative agent' in particles responsible for damaging health is the subject of increasing study, but many questions remain. Reactive oxygen species, including hydrogen peroxide, are candidates for part of the adverse health effects caused by particle inhalation. In this project, aerosol borne oxidants are being characterized, investigating the relationship between these toxic compounds and location, source type, aerosol type, and photochemical activity. Additionally, laboratory studies on model systems are underway to determine the source and behavior of peroxides in aerosols.

Location: Kaprielian Hall (KAP) - 203

Audiences: Everyone Is Invited

Contact: Evangeline Reyes