globalchange  > 气候变化事实与影响
DOI: 10.1002/2017GB005824
Scopus记录号: 2-s2.0-85044215756
论文题名:
Present and Future Mercury Concentrations in Chinese Rice: Insights From Modeling
作者: Kwon S; Y; , Selin N; E; , Giang A; , Karplus V; J; , Zhang D
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2018
卷: 32, 期:3
起始页码: 437
结束页码: 462
语种: 英语
英文关键词: biogeochemical cycle ; China ; mercury ; Minamata ; model ; rice
英文摘要: We construct a rice paddy biogeochemical cycle model to investigate processes governing rice mercury sources and to understand factors influencing spatiotemporal variability in Chinese rice mercury concentrations. The rice paddy model takes atmospheric mercury deposition, simulated from a global atmospheric chemistry transport model (GEOS-Chem), and soil and irrigable surface water mercury concentrations obtained from literature and calculates rice inorganic (IHg) and methylmercury (MeHg) concentrations. We use ranges of GEOS-Chem-simulated future atmospheric mercury deposition—no policy and strict policy to regulate mercury emissions from Chinese coal-fired power plants under the Minamata Convention on Mercury—to simulate future rice IHg and MeHg concentrations. Sensitivity analyses suggest that rice IHg and MeHg concentrations are more sensitive to the process of soil desorption than infiltration of recently introduced mercury (atmospheric and irrigation source). The rate of internal methylation via microbial activity has the largest modeled influence on rice MeHg concentration. We find that soil mercury, rather than atmospheric deposition, explains observed spatial variability in rice IHg and MeHg concentrations and captures locations of rice mercury hot spots (>20 ng/g; China National Standard Limit). Under our future scenarios, the Chinese median rice IHg and MeHg concentration increases by 13% and decrease by 18% under no policy and strict policy, respectively. Regions with the largest percentage decline in rice IHg and MeHg concentrations under strict policy are in central China, which have high rice mercury concentrations, rice production, and consumption. Our study suggests that addressing Chinese rice mercury contamination requires attention to contaminated soil and regulation of anthropogenic mercury emissions. ©2018. 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/77656
Appears in Collections:气候变化事实与影响

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作者单位: Institute for Data, Systems, and Society, Massachusetts Institute of Technology, Cambridge, MA, United States; Now at Division of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang, South Korea; Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Now at Institute for Resources, Environment and Sustainability, University of British Columbia, Vancouver, BC, Canada; Now at Department of Mechanical Engineering, University of British Columbia, Vancouver, BC, Canada; Joint Program on the Science and Policy of Global Change, Massachusetts Institute of Technology, Cambridge, MA, United States; Sloan School of Management, Massachusetts Institute of Technology, Cambridge, MA, United States

Recommended Citation:
Kwon S,Y,, Selin N,et al. Present and Future Mercury Concentrations in Chinese Rice: Insights From Modeling[J]. Global Biogeochemical Cycles,2018-01-01,32(3)
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