Global Sources and Transport of Air Pollution: A Chinese Case Jintai Lin , PKU ACM GroupPeking University 1 2 Group: D. Pan, R.-X. Zhang, Y.-Y. Yan, R.-J. Ni, M.-Y. Liu, J.-X. Wang, J.-W. Zhuang, Y. Zhang, C.-G. Wang... China: Q. Zhang, K. He, Y. Zhao, Y. Lei, P. Wang N.A.: S. Davis, D. Streets, D. Wuebbles, M. McElroy, C. Nielsen, R. Spurr, R. Martin Europe: D. Guan, K.F. Boersma, M. van Roozendael Funding: NSFC , , , etc. ACM Group, Collaborators and Funding Chinese O 3 Transport Affects the U.S. 3 Verstraeten et al., 2015, Nature Geoscience Transport from China of O 3 and precursors has offset ~ 43% of O 3 reduction in the western US free troposphere expected from emission control Foreign Pollution Greatly Affect Chinas O 3 4 Upper Mid Lower From Europe From N. America ppb Spring 2009 Ni et al., in prep 5 Looped Mechanism of Pollution Transport China = Producer Consumer = Foreign Trade Atmospheric Atmosphere: Move pollution from producer to consumer Trade: Move Pollution from consumer to producer Lin et al., 2014, PNAS Trade Redefines Chinese and U.S. Emissions Trade increases Chinese emis, but decreases U.S. emis Export-to-world contributes 36% of Chinese SO 2 emis in 2006 Sino-US-trade-related SO 2 emis are 19% of U.S. emis in 2006 Lin et al., 2014, PNAS SO 2 Emissions (Tg/yr) 6 wrt Chinas consumption Produced in China wrt U.S. consumption Produced in U.S. supplied by China Goods Export Contributes ~ 30% of Chinas Sulfate Lin et al., 2014, PNAS 7 % contribution of Chinas export-related pollution to total sulfate pollution Export of Goods Contributes to Chinas Pollution 8 % contribution of Chinas export-related pollution to total pollution Lin et al., 2014, PNAS USA Consumption Affects Chinas Sulfate Pollution 9 USA imports goods from China versus self-production: (accounting for differences in emission intensity) Increase Chinas sulfate PM Decrease USAs sulfate PM overall, GOOD for USA Lin et al., 2014, PNAS This is in contrast to traditional view that China reduces USA air quality via atmospheric transport ! % change in sulfate Trade-Transport Study Won PNAS Cozzarelli Prize ! (One of the 6 out of 3500 PNAS papers) 10 Summary Globalization of Air Pollution 11 Given the looped mechanism of pollution transport : Domestic economic and environmental strategy ? International collaboration to reduce pollution transport ? Roles of consumers and producers ? We Hire Postdocs Producer Consumer Trade Atmospheric