气候变化领域集成服务门户(CCPortal): Constraining the atmospheric limb of the plastic cycle

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DOI	10.1073/pnas.2020719118
	Constraining the atmospheric limb of the plastic cycle
	Brahney J.; Mahowald N.; Prank M.; Cornwell G.; Klimont Z.; Matsui H.; Prather K.A.
发表日期	2021
ISSN	00278424
卷号	118 期号:16
英文摘要	Plastic pollution is one of the most pressing environmental and social issues of the 21st century. Recent work has highlighted the atmosphere's role in transporting microplastics to remote locations [S. Allen et al., Nat. Geosci. 12, 339 (2019) and J. Brahney, M. Hallerud, E. Heim, M. Hahnenberger, S. Sukumaran, Science 368, 1257-1260 (2020)]. Here, we use in situ observations of microplastic deposition combined with an atmospheric transport model and optimal estimation techniques to test hypotheses of the most likely sources of atmospheric plastic. Results suggest that atmospheric microplastics in the western United States are primarily derived from secondary re-emission sources including roads (84%), the ocean (11%), and agricultural soil dust (5%). Using our best estimate of plastic sources and modeled transport pathways, most continents were net importers of plastics from the marine environment, underscoring the cumulative role of legacy pollution in the atmospheric burden of plastic. This effort uses high-resolution spatial and temporal deposition data along with several hypothesized emission sources to constrain atmospheric plastic. Akin to global biogeochemical cycles, plastics now spiral around the globe with distinct atmospheric, oceanic, cryospheric, and terrestrial residence times. Though advancements have been made in the manufacture of biodegradable polymers, our data suggest that extant nonbiodegradable polymers will continue to cycle through the earth's systems. Due to limited observations and understanding of the source processes, there remain large uncertainties in the transport, deposition, and source attribution of microplastics. Thus, we prioritize future research directions for understanding the plastic cycle. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Atmospheric microplastics; Microplastic pollution; Plastic aerosols; Plastic cycle; Plastic deposition
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179829
作者单位	Department of Watershed Sciences, Utah State University, Logan, UT 84322, United States; Department of Earth and Atmospheric Sciences, Atkinson Center for Sustainability, Cornell University, Ithaca, NY 14853, United States; Department of Climate System Research, Climate System Modelling Group, Finnish Meteorological Institute, Helsinki, 00560, Finland; Pollution Management Group, Pacific Northwest National Laboratory, Richland, WA 99352, United States; Energy, Climate and Environment Program, International Institute for Applied Systems Analysis, Laxenburg, 2361, Austria; Graduate School of Environmental Studies, Nagoya University, Nagoya, 4648601, Japan; Scripps Institution of Oceanography, University of California San Diego, San Diego, CA 92093, United States; Department of Chemistry and Biochemistry, University of California San Diego, San Diego, CA 92093, United States
推荐引用方式 GB/T 7714	Brahney J.,Mahowald N.,Prank M.,et al. Constraining the atmospheric limb of the plastic cycle[J],2021,118(16).
APA	Brahney J..,Mahowald N..,Prank M..,Cornwell G..,Klimont Z..,...&Prather K.A..(2021).Constraining the atmospheric limb of the plastic cycle.Proceedings of the National Academy of Sciences of the United States of America,118(16).
MLA	Brahney J.,et al."Constraining the atmospheric limb of the plastic cycle".Proceedings of the National Academy of Sciences of the United States of America 118.16(2021).