globalchange  > 气候变化与战略
DOI: 10.1029/2018GB006018
论文题名:
A Global 3-D Ocean Model for PCBs: Benchmark Compounds for Understanding the Impacts of Global Change on Neutral Persistent Organic Pollutants
作者: Wagner C.C.; Amos H.M.; Thackray C.P.; Zhang Y.; Lundgren E.W.; Forget G.; Friedman C.L.; Selin N.E.; Lohmann R.; Sunderland E.M.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期:3
语种: 英语
英文关键词: benchmarking ; burial (geology) ; depositional environment ; environmental fate ; global change ; marine sediment ; oceanic circulation ; partitioning ; persistent organic pollutant ; pollutant transport ; sea ice ; three-dimensional modeling ; Arctic Ocean
学科: biogeochemistry ; fate and transport modeling ; ocean ; persistent pollutants
中文摘要: Human activities have released large quantities of neutral persistent organic pollutants (POPs) that may be biomagnified in food webs and pose health risks to wildlife, particularly top predators. Here we develop a global 3-D ocean simulation for four polychlorinated biphenyls (PCBs) spanning a range of molecular weights and volatilities to better understand effects of climate-driven changes in ocean biogeochemistry on the lifetime and distribution of POPs. Observations are most abundant in the Arctic Ocean. There, model results reproduce spatial patterns and magnitudes of measured PCB concentrations. Sorption of PCBs to suspended particles and subsequent burial in benthic marine sediment is the dominant oceanic loss process globally. Results suggest benthic sediment burial has removed 75% of cumulative PCB releases since the onset of production in 1930. Wind speed, light penetration, and ocean circulation exert a stronger and more variable influence on volatile PCB congeners with lower particle affinity such as chlorinated biphenyl-28 and chlorinated biphenyl-101. In the Arctic Ocean between 1992 and 2015, modeled evasion (losses) of the more volatile PCB congeners from the surface ocean increased due to declines in sea ice and changes in ocean circulation. By contrast, net deposition increased slightly for higher molecular weight congeners with stronger partitioning to particles. Our results suggest future climate changes will have the greatest impacts on the chemical lifetimes and distributions of volatile POPs with lower molecular weights. © 2019. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160136
Appears in Collections:气候变化与战略

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作者单位: Harvard John A. Paulson School of Engineering and Applied Science, Harvard University, Cambridge, MA, United States; Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, MA, United States; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Corning School of Ocean Studies, Maine Maritime Academy, Castine, ME, United States; Institute for Data, Systems, and Society, Massachusetts Institute of Technology, Cambridge, MA, United States; Graduate School of Oceanography, University of Rhode Island, Narragansett, RI, United States

Recommended Citation:
Wagner C.C.,Amos H.M.,Thackray C.P.,et al. A Global 3-D Ocean Model for PCBs: Benchmark Compounds for Understanding the Impacts of Global Change on Neutral Persistent Organic Pollutants[J]. Global Biogeochemical Cycles,2019-01-01,33(3)
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