EPSSI seminar: Dr. ManishKumar Shrivastava, Pacific Northwest National Laboratory
New Research Frontiers in Secondary Organic Aerosols: Connecting Atmospheric Chemistry, Clouds, Radiation and Human Health
Secondary organic aerosols (SOA) are nanoparticles in the atmosphere affecting air quality, visibility, human health, clouds and radiation. Unseen by the naked eye, large quantities of carbon-containing vapors enter the atmosphere as they escape from trees, fossil-fuel burning, and forest fires. The atmosphere is like a large chemical reactor, "cooking" these emissions to form millions of new carbon-containing molecules. Some of these molecules then condense into SOA nano-particles that can change clouds, precipitation, and the amount of solar energy reaching the Earth. SOA particles are incredibly complex since they comprise thousands of organic molecules, many of which have not been explicitly identified. In this talk I will describe some of my latest research findings including aqueous and cloud SOA chemistry in a high-resolution three dimensional regional chemical transport model. In addition, I will show how SOA coatings around toxic cancer-causing trace compounds (polycyclic aromatic hydrocarbons) shield these air toxics from heterogeneous oxidation in the atmosphere, promoting their long-range transport and increasing lung-cancer risk. This research represents new research frontiers connecting atmospheric chemistry, human health, clouds and radiation.
Monday, September 24, 2018 at 4:05 pm to 4:55 pm
Minerals and Materials Engineering Building (M&M), U113
1400 Townsend Drive, Houghton, MI 49931