ACP Atmospheric Chemistry and Physics ACP Atmos. Chem. Phys. 1680-7324 Copernicus Publications Göttingen, Germany 10.5194/acp-9-1125-2009 The effects of global changes upon regional ozone pollution in the United States Chen J. 6 1 Avise J. 1 7 Lamb B. 1 Salathé E. 2 Mass C. 2 Guenther A. 3 Wiedinmyer C. 3 Lamarque J.-F. 3 O'Neill S. 4 McKenzie D. 5 Larkin N. 5 Washington State University, Pullman, WA, USA University of Washington, Seattle, WA, USA National Center for Atmospheric Research, Boulder, CO, USA United States Dept. of Agriculture, Natural Resources Conservation Service, Portland, OR, USA United States Dept. of Agriculture, Forest Service, Seattle, WA, USA now at: National Research Council Canada, Ottawa, ON, Canada now at: California Air Resources Board, Sacramento, CA, USA 16 02 2009 9 4 1125 1141 Copyright: © 2009 J. Chen et al. 2009 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://acp.copernicus.org/articles/9/1125/2009/acp-9-1125-2009.html The full text article is available as a PDF file from https://acp.copernicus.org/articles/9/1125/2009/acp-9-1125-2009.pdf

A comprehensive numerical modeling framework was developed to estimate the effects of collective global changes upon ozone pollution in the US in 2050. The framework consists of the global climate and chemistry models, PCM (Parallel Climate Model) and MOZART-2 (Model for Ozone and Related Chemical Tracers v.2), coupled with regional meteorology and chemistry models, MM5 (Mesoscale Meteorological model) and CMAQ (Community Multi-scale Air Quality model). The modeling system was applied for two 10-year simulations: 1990–1999 as a present-day base case and 2045–2054 as a future case. For the current decade, the daily maximum 8-h moving average (DM8H) ozone mixing ratio distributions for spring, summer and fall showed good agreement with observations. The future case simulation followed the Intergovernmental Panel on Climate Change (IPCC) A2 scenario together with business-as-usual US emission projections and projected alterations in land use, land cover (LULC) due to urban expansion and changes in vegetation. For these projections, US anthropogenic NO<sub>x</sub> (NO+NO<sub>2</sub>) and VOC (volatile organic carbon) emissions increased by approximately 6% and 50%, respectively, while biogenic VOC emissions decreased, in spite of warmer temperatures, due to decreases in forested lands and expansion of croplands, grasslands and urban areas. A stochastic model for wildfire emissions was applied that projected 25% higher VOC emissions in the future. For the global and US emission projection used here, regional ozone pollution becomes worse in the 2045–2054 period for all months. Annually, the mean DM8H ozone was projected to increase by 9.6 ppbv (22%). The changes were higher in the spring and winter (25%) and smaller in the summer (17%). The area affected by elevated ozone within the US continent was projected to increase; areas with levels exceeding the 75 ppbv ozone standard at least once a year increased by 38%. In addition, the length of the ozone season was projected to increase with more pollution episodes in the spring and fall. For selected urban areas, the system projected a higher number of pollution events per year and these events had more consecutive days when DM8H ozone exceed 75 ppbv.

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