Anthropogenic and natural contribution to regional trends in aerosol optical depth, 1980-2006

Streets, D.G.; Diehl, T.; Schultz, M.; Yan, F.; Mahowald, N.; Chin, M.; Yu, C.; Wild, M.; Wu, Y.

doi:10.1029/2008JD011624

Journal Article

Anthropogenic and natural contribution to regional trends in aerosol optical depth, 1980-2006

Streets, D. G. ; Yan, F. ; Chin, M. ; Diehl, T. ; Mahowald, N. ; Schultz, M.FZJ* ; Wild, M. ; Wu, Y. ; Yu, C.

2009
Union Washington, DC

Journal of Geophysical Research 114, D00D18 (2009) [10.1029/2008JD011624]

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Please use a persistent id in citations: http://hdl.handle.net/2128/20441 doi:10.1029/2008JD011624

Abstract: Understanding the roles of human and natural sources in contributing to aerosol concentrations around the world is an important step toward developing efficient and effective mitigation measures for local and regional air quality degradation and climate change. In this study we test the hypothesis that changes in aerosol optical depth (AOD) over time are caused by the changing patterns of anthropogenic emissions of aerosols and aerosol precursors. We present estimated trends of contributions to AOD for eight world regions from 1980 to 2006, built upon a full run of the Goddard Chemistry Aerosol Radiation and Transport model for the year 2001, extended in time using trends in emissions of man-made and natural sources. Estimated AOD trends agree well (R > 0.5) with observed trends in surface solar radiation in Russia, the United States, south Asia, southern Africa, and East Asia (before 1992) but less well for Organization for Economic Co-operative Development (OECD) Europe (R < 0.5). The trends do not agree well for southeast Asia and for East Asia (after 1992) where large-scale inter- and intraannual variations in emissions from forest fires, volcanic eruptions, and dust storms confound our approach. Natural contributions to AOD, including forest and grassland fires, show no significant long-term trends (< 1%/a), except for a small increasing trend in OECD Europe and a small decreasing trend in South America. Trends in man-made contributions to AOD follow the changing patterns of industrial and economic activity. We quantify the average contributions of key source types to regional AOD over the entire time period.

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Meteorology & Atmospheric Sciences

Note: The work performed at Argonne National Laboratory was funded by the U. S. Department of Energy, Office of Science, Office of Biological and Environmental Research. The authors gratefully acknowledge the support of Ashley Williamson and Bob Vallario in that office. Argonne National Laboratory is operated by the University of Chicago Argonne, LLC, under contract DE-AC02-06CH11357 with the U. S. Department of Energy. The radiation data archives at ETH Zurich are supported by funding from the Swiss National Centre for Competence in Climate Research (NCCR Climate).

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