| Title: | Impact of Urban Pollution on Organic-Mediated New-Particle Formation and Particle Number Concentration in the Amazon Rainforest |
| Author(s): | Zhao B; Fast JD; Donahue NM; Shrivastava M; Schervish M; Shilling JE; Gordon H; Wang J; Gao Y; Zaveri RA; Liu Y; Gaudet B; |
| Address: | "Pacific Northwest National Laboratory, Richland, Washington 99354, United States. Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States. Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States. Department of Engineering and Public Policy, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States. Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States. Center for Aerosol Science and Engineering, Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States. Key Laboratory of Marine Environment and Ecology, Ministry of Education/Institute for Advanced Ocean Study, Ocean University of China, Qingdao 266100, China" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "A major challenge in assessing the impact of aerosols on climate change is to understand how human activities change aerosol loading and properties relative to the pristine/preindustrial baseline. Here, we combine chemical transport simulations and field measurements to investigate the effect of anthropogenic pollution from an isolated metropolis on the particle number concentration over the preindustrial-like Amazon rainforest through various new-particle formation (NPF) mechanisms and primary particle emissions. To represent organic-mediated NPF, we employ a state-of-the-art model that systematically simulates the formation chemistry and thermodynamics of extremely low volatility organic compounds, as well as their roles in NPF processes, and further update the model to improve organic NPF simulations under human-influenced conditions. Results show that urban pollution from the metropolis increases the particle number concentration by a factor of 5-25 over the downwind region (within 200 km from the city center) compared to background conditions. Our model indicates that NPF contributes over 70% of the total particle number in the downwind region except immediately adjacent to the sources. Among different NPF mechanisms, the ternary NPF involving organics and sulfuric acid overwhelmingly dominates. The improved understanding of particle formation mechanisms will help better quantify anthropogenic aerosol forcing from preindustrial times to the present day" |
| Keywords: | Aerosols/analysis *Air Pollutants/analysis Cities Environmental Pollution Humans Rainforest; |
| Notes: | "MedlineZhao, Bin Fast, Jerome D Donahue, Neil M Shrivastava, Manish Schervish, Meredith Shilling, John E Gordon, Hamish Wang, Jian Gao, Yang Zaveri, Rahul A Liu, Ying Gaudet, Brian eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2021/03/12 Environ Sci Technol. 2021 Apr 20; 55(8):4357-4367. doi: 10.1021/acs.est.0c07465. Epub 2021 Mar 11" |
