ACP Atmospheric Chemistry and Physics ACP Atmos. Chem. Phys. 1680-7324 Copernicus Publications Göttingen, Germany 10.5194/acp-9-6077-2009 Effect of regional precursor emission controls on long-range ozone transport – Part 1: Short-term changes in ozone air quality West J. J. 1 Naik V. 2 4 Horowitz L. W. 3 Fiore A. M. 3 University of North Carolina, Chapel Hill, NC, USA Princeton University, Princeton, NJ, USA NOAA Geophysical Fluid Dynamics Laboratory, Princeton, NJ, USA now at: ATMOS Research and Consulting, Lubbock, TX, USA 21 08 2009 9 16 6077 6093 Copyright: © 2009 J. J. West 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/9/6077/2009/acp-9-6077-2009.html The full text article is available as a PDF file from https://acp.copernicus.org/articles/9/6077/2009/acp-9-6077-2009.pdf

Observations and models demonstrate that ozone and its precursors can be transported between continents and across oceans. We model the influences of 10% reductions in anthropogenic nitrogen oxide (NO<sub>x</sub>) emissions from each of nine world regions on surface ozone air quality in that region and all other regions. In doing so, we quantify the relative importance of long-range transport between all source-receptor pairs, for direct short-term ozone changes. We find that for population-weighted concentrations during the three-month "ozone-season", the strongest inter-regional influences are from Europe to the Former Soviet Union, East Asia to Southeast Asia, and Europe to Africa. The largest influences per unit of NO<sub>x</sub> reduced, however, are seen for source regions in the tropics and Southern Hemisphere, which we attribute mainly to greater sensitivity to changes in NO<sub>x</sub> in the lower troposphere, and secondarily to increased vertical convection to the free troposphere in tropical regions, allowing pollutants to be transported further. Results show, for example, that NO<sub>x</sub> reductions in North America are ~20% as effective per unit NO<sub>x</sub> in reducing ozone in Europe during summer, as NO<sub>x</sub> reductions from Europe itself. Reducing anthropogenic emissions of non-methane volatile organic compounds (NMVOCs) and carbon monoxide (CO) by 10% in selected regions, can have as large an impact on long-range ozone transport as NO<sub>x</sub> reductions, depending on the source region. We find that for many source-receptor pairs, the season of greatest long-range influence does not coincide with the season when ozone is highest in the receptor region. Reducing NO<sub>x</sub> emissions in most source regions causes a larger decrease in export of ozone from the source region than in ozone production outside of the source region.

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