Microbial mercury methylation in the cryosphere: Progress and prospects
Ghimire, PS (Ghimire, Prakriti Sharma)1,3; Tripathee, L (Tripathee, Lekhendra)1,3; Zhang, QG (Zhang, Qianggong)2,4; Guo, JM (Guo, Junming)1; Ram, K (Ram, Kirpa)5; Huang, J (Huang, Jie)2,4; Sharma, CM (Sharma, Chhatra Mani)3,6; Kang, SC (Kang, Shichang)1,2

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.

Subject AreaEnvironmental Sciences
WOS IDWOS:000499668600117
Indexed BySCI
KeywordDissolved Gaseous Mercury Heavy-metals Atmospheric Mercury Surface Waters Fresh-water Sea-ice Methylmercury Production Principal Methylators Bacterial Communities Accumulation Rates
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
Cooperation Status国际
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Document Type期刊论文
Corresponding AuthorTripathee, L (Tripathee, Lekhendra); Kang, SC (Kang, Shichang)
Affiliation1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Gansu, Peoples R China;
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100085, Peoples R China;
3.HERI, Kathmandu, Nepal;
4.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China;
5.Banaras Hindu Univ, Inst Environm & Sustainable Dev, Varanasi, Uttar Pradesh, India;
6.Tribhuvan Univ, Cent Dept Environm Sci, Kathmandu, Nepal.
Recommended Citation
GB/T 7714
Ghimire, PS ,Tripathee, L ,Zhang, QG ,et al. Microbial mercury methylation in the cryosphere: Progress and prospects[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,697(0):134150.
APA Ghimire, PS .,Tripathee, L .,Zhang, QG .,Guo, JM .,Ram, K .,...&Kang, SC .(2019).Microbial mercury methylation in the cryosphere: Progress and prospects.SCIENCE OF THE TOTAL ENVIRONMENT,697(0),134150.
MLA Ghimire, PS ,et al."Microbial mercury methylation in the cryosphere: Progress and prospects".SCIENCE OF THE TOTAL ENVIRONMENT 697.0(2019):134150.
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