Nov 6: Dr. John Shilling, PNNL: Laboratory Studies of Secondary Organic Aerosol Chemistry, Optical Properties, and Growth Kinetics

Dr. John Shilling, atmospheric chemist at Pacific Northwest National Laboratory (PNNL) in the Atmospheric Sciences and Global Change Division, will speak on Monday, November 6, at 4:10 pm in PACCAR 202, as part of the Department of Civil and Environmental Engineering Air and Water Seminar Series.

Aerosol particles affect the Earth’s radiation balance directly by absorbing and scattering solar radiation, and indirectly by affecting cloud formation and properties. From field measurements, we know that a significant fraction of the total submicron aerosol mass is secondary organic aerosol (SOA) – formed in the atmosphere. However, atmospheric models do not reproduce SOA mass concentrations and properties. Dr. Shilling’s group is working to close the gap between field observations and modeling results, by simulating SOA formation under controlled conditions in an environmental chamber. Dr. Shilling will discuss the results of three recent projects that examined SOA yields, growth kinetics; and optical properties of SOA formed from various precursor compounds and reaction conditions.

Dr. Shilling received his PhD in Analytical Atmospheric Chemistry from the University of Colorado, Boulder, in 2005. He worked as a post-doctoral fellow in Engineering and Applied Sciences at Harvard University, and moved to PNNL in 2008, and led a project to design and build the aerosol measurement laboratory and aerosol (smog) chamber which has become an important PNNL research facility. Dr. Shilling also participates in field studies and deployed both gas- and aerosol-phase mass spectrometers onboard the G-1 research aircraft during six major field campaigns.

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