Eric Salathé and Brian Lamb
Tuesday, December 2, 2008
Influence of Global Change on Regional Air Quality in the U.S.
Global changes such as climate, land use, land cover changes and the associated biogenic and anthropogenic emission changes are interrelated factors that can cause significant differences in future air quality. This work addresses the consequences of global change on air quality in the continental U.S. The approach uses a multi-scale numerical modeling system where output from global climate models and the NCAR MOZART2 chemical transport model are downscaled using MM5/SMOKE/CMAQ regional atmospheric chemistry modeling system. Simulations have been conducted for both current (1990-1999) and future (2045-2054) air quality conditions over two ten-year periods at 36 km for the continental U.S. These simulations are based upon the global IPCC A2-“business as usual” scenario coupled with EPA projections for future US emissions. The global chemistry model accounts for inter-continental pollutant transport and chemistry that affect background pollutant conditions into the U.S. Air quality changes in terms of ozone, PM2.5 and pollutant deposition from the CMAQ regional air quality model reflect environmental impacts due to global changes including changes in US anthropogenic emissions as well as changes in U.S. landcover and the effects of these changes upon biogenic emissions and the occurrence of wildfires.
Eric Salathé is a Research Scientist at the Climate Impacts Group and Affiliate Assistant Professor at the UW's Department of Atmospheric Sciences. Brian Lamb is Regents Professor at the Washington State University's Department of Civil and Environmental Engineering.