Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 23 2008 10.5194/acp-8-7101-2008 http://www.atmos-chem-phys.net/8/7101/2008/ http://www.atmos-chem-phys.net/8/7101/2008/acp-8-7101-2008.html http://www.atmos-chem-phys.net/8/7101/2008/acp-8-7101-2008.pdf 7101 7113 2008-12-08 Climate forcing and air quality change due to regional emissions reductions by economic sector D. Shindell drew.t.shindell@nasa.gov J.-F. Lamarque N. Unger D. Koch G. Faluvegi S. Bauer M. Ammann J. Cofala H. Teich NASA Goddard Institute for Space Studies, New York, NY, USA National Center for Atmospheric Research, Boulder, CO, USA International Institute for Applied Systems Analysis, Laxenburg, Austria We examine the air quality (AQ) and radiative forcing (RF) response to emissions reductions by economic sector for North America and developing Asia in the CAM and GISS composition/climate models. Decreases in annual average surface particulate are relatively robust, with intermodel variations in magnitude typically &lt;30% and very similar spatial structure. Surface ozone responses are small and highly model dependent. The largest net RF results from reductions in emissions from the North America industrial/power and developing Asia domestic fuel burning sectors. Sulfate reductions dominate the first case, for which intermodel variations in the sulfate (or total) aerosol optical depth (AOD) responses are ~30% and the modeled spatial patterns of the AOD reductions are highly correlated (<i>R</i>=0.9). Decreases in BC dominate the developing Asia domestic fuel burning case, and show substantially greater model-to-model differences. Intermodel variations in tropospheric ozone burden changes are also large, though aerosol changes dominate those cases with substantial net climate forcing. The results indicate that across-the-board emissions reductions in domestic fuel burning in developing Asia and in surface transportation in North America are likely to offer the greatest potential for substantial, simultaneous improvement in local air quality and near-term mitigation of global climate change via short-lived species. Conversely, reductions in industrial/power emissions have the potential to accelerate near-term warming, though they would improve AQ and have a long-term cooling effect on climate. These broad conclusions appear robust to intermodel differences. Andreae, M. O. and Merlet, P.: Emission of trace gases and aerosols from biomass burning, Global Biogeochem. Cy., 15, 955–966, 2001. Arellano, A. F. J., Kasibhatla, P. S., Giglio, L., van der Werf, G. R., and Randerson, J. T.: Top-down estimates of global CO sources using mopitt measurements, Geophys. Res. Lett., 31, L01104, doi:10.1029/2003GL018609, 2004. Bauer, S. E., Mishchenko, M. 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