气候变化领域集成服务门户(CCPortal): Present and Future Mercury Concentrations in Chinese Rice: Insights From Modeling

CCPortal

DOI	10.1002/2017GB005824
	Present and Future Mercury Concentrations in Chinese Rice: Insights From Modeling
	Kwon S.Y.; Selin N.E.; Giang A.; Karplus V.J.; Zhang D.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	437
结束页码	462
卷号	32 期号:3
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.
英文关键词	biogeochemical cycle; China; mercury; Minamata; model; rice
语种	英语
scopus关键词	agricultural land; anthropogenic source; antimicrobial activity; atmospheric chemistry; atmospheric modeling; atmospheric transport; biochemical composition; biogeochemical cycle; desorption; future prospect; infiltration; mercury (element); methylation; methylmercury; rice; spatiotemporal analysis; China; Japan; Kumamoto; Kyushu; Minamata
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129850
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
推荐引用方式 GB/T 7714	Kwon S.Y.,Selin N.E.,Giang A.,et al. Present and Future Mercury Concentrations in Chinese Rice: Insights From Modeling[J],2018,32(3).
APA	Kwon S.Y.,Selin N.E.,Giang A.,Karplus V.J.,&Zhang D..(2018).Present and Future Mercury Concentrations in Chinese Rice: Insights From Modeling.Global Biogeochemical Cycles,32(3).
MLA	Kwon S.Y.,et al."Present and Future Mercury Concentrations in Chinese Rice: Insights From Modeling".Global Biogeochemical Cycles 32.3(2018).