气候变化领域集成服务门户(CCPortal): Microbial mercury methylation in the cryosphere: Progress and prospects

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DOI	10.1016/j.scitotenv.2019.134150
	Microbial mercury methylation in the cryosphere: Progress and prospects
	Ghimire, Prakriti Sharma; Tripathee, Lekhendra; Zhang, Qianggong; Guo, Junming; Ram, Kirpa; Huang, Jie; Sharma, Chhatra Mani; Kang, Shichang
通讯作者	Tripathee, L ; Kang, SC (通讯作者)
发表日期	2019
ISSN	0048-9697
EISSN	1879-1026
卷号	697
英文摘要	Mercury (Hg) is one of the most toxic heavy metals, and its cycle is mainly controlled by oxidation-reduction reactions carried out by photochemical or microbial process under suitable conditions. The deposition and accumulation of methylmercury (MeHg) in various ecosystems, including the cryospheric components such as snow, meltwater, glaciers, and ice sheet, and subsequently in the food chain pose serious health concerns for living beings. Unlike the abundance of knowledge about the processes of MeHg production over land and oceans, little is known about the sources and production/degradation rate of MeHg in cryosphere systems. In addition, processes controlling the concentration of Hg and MeHg in the cryosphere remains poorly understood, and filling this scientific gap has been challenging. Therefore, it is essential to study and review the deposition and accumulation by biological, physical, and chemical mechanisms involved in Hg methylation in the cryosphere. This review attempts to address knowledge gaps in understanding processes, especially biotic and abiotic, applicable for Hg methylation in the cryosphere. First, we focus on the variability in Hg concentration and mechanisms of Hg methylation, including physical, chemical, microbial, and biological processes, and transportation in the cryosphere. Then, we elaborate on the mechanism of redox reactions and biotic and abiotic factors controlling Hg methylation and biogeochemistry of Hg in the cryosphere. We also present possible mechanisms of Hg methylation with an emphasis on microbial transformation and molecular function to understand variability in Hg concentration in the cryosphere. Recent advancements in the genetic and physicochemical mechanisms of Hg methylation are also presented. Finally, we summarize and propose a method to study the unsolved issues of Hg methylation in the cryosphere. (C) 2019 Elsevier B.V. All rights reserved.
关键词	DISSOLVED GASEOUS MERCURY HEAVY-METALS ATMOSPHERIC MERCURY SURFACE WATERS FRESH-WATER SEA-ICE METHYLMERCURY PRODUCTION PRINCIPAL METHYLATORS BACTERIAL COMMUNITIES ACCUMULATION RATES
英文关键词	Mercury methylation; Microbes; Microbial abundance; Knowledge gaps; The cryosphere
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000499668600117
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259551
推荐引用方式 GB/T 7714	Ghimire, Prakriti Sharma,Tripathee, Lekhendra,Zhang, Qianggong,et al. Microbial mercury methylation in the cryosphere: Progress and prospects[J]. 中国科学院青藏高原研究所,2019,697.
APA	Ghimire, Prakriti Sharma.,Tripathee, Lekhendra.,Zhang, Qianggong.,Guo, Junming.,Ram, Kirpa.,...&Kang, Shichang.(2019).Microbial mercury methylation in the cryosphere: Progress and prospects.SCIENCE OF THE TOTAL ENVIRONMENT,697.
MLA	Ghimire, Prakriti Sharma,et al."Microbial mercury methylation in the cryosphere: Progress and prospects".SCIENCE OF THE TOTAL ENVIRONMENT 697(2019).