October 21, 2011

Air Quality and Climate in California


Dr. Michael J. Kleeman, Professor, Department of Civil and Environmental Engineering, UC Davis


Climate and air quality in California are linked in a complex system that is evolving over time. This presentation will analyze the direct and indirect effects of climate change on the ozone (O3) and airborne particulate matter (PM) concentrations experienced by ~30M California residents. Observations and model results will be analyzed to show that the O3 climate penalty has decreased overtime and to predict how it will change in the future. Seven years of simulated climate/air quality around the year 2000 and the year 2050 will be analyzed to show that the direct effect of climate change on annual-average PM concentrations is small and may be negative, but the direct effect of climate change on extreme PM concentrations is large and positive. Finally, the reduced PM concentrations resulting from California Assembly Bill 32 (AB32) and California Governor’s Executive Order S-305 will be quantified.

Biographical Sketch

Michael Kleeman earned his B.A.Sc. (1993)  in Mechanical Engineering from the University of Waterloo (Canada) and his M.S. (1994) and  PhD (1998) in Environmental Engineering Science from the California Institute of Technology.  He has been a faculty member in the Department of Civil and Environmental Engineering at  UC Davis since 1999. Professor Kleeman has authored more that 80 papers on the modeling and  measurement of regional air quality. His past projects related to this presentation have  studied climate impacts on air quality in California and the future criteria pollutant emissions  in California. His major current research projects involve estimating the health effect of PM from different sources and regional feedbacks between PM and meteorology.