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Mass Budget of Methylmercury in the East Siberian Sea: The Importance of Sediment Sources

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Title
Mass Budget of Methylmercury in the East Siberian Sea: The Importance of Sediment Sources
Other Titles
동시베리아해에서 메틸수은의 질량 수지: 퇴적물 공급원의 중요성
Authors
Kim, Jihee
Soerensen, Anne L.
Kim, Mi Seon
Eom, Sangwoo
Rhee, Tae Siek
Jin, Young Keun
Han, Seunghee
Subject
Engineering; Environmental Sciences & Ecology
Issue Date
2020-08
Citation
Kim, Jihee, et al. 2020-08. "Mass Budget of Methylmercury in the East Siberian Sea: The Importance of Sediment Sources". ENVIRONMENTAL SCIENCE & TECHNOLOGY, 54(16): 9949-9957.
Abstract
Biological concentrations of methylmercury (MeHg) are elevated throughout the Arctic Ocean; however, to date, the major sources and the spatial variability of MeHg are not well quantified. To identify the major inputs and outputs of MeHg to the Arctic shelf water column, we measured MeHg concentrations in the seawater and sediment samples from the East Siberian Sea collected from August to September 2018. We found that the MeHg concentrations in seawater and pore water were higher on the slope than on the shelf, while the MeHg concentrations in the sediment were higher on the shelf than on the slope. We created a mass budget for MeHg and found that the benthic diffusion and resuspension largely exceed other sources, such as atmospheric deposition and river water input. The major sinks of MeHg in the water column were dark demethylation and evasion. When we extrapolated our findings on benthic diffusion to the entire Arctic shelf system, the annual MeHg diffusion from the shelf sediments was estimated to be 23,065 +/- 939 mol yr(-1), about 2 times higher than previously proposed river discharges. Our study suggests that the MeHg input from shelf sediments in the Arctic Ocean is significant and has been previously underestimated.
URI
https://repository.kopri.re.kr/handle/201206/11853
DOI
http://dx.doi.org/10.1021/acs.est.0c00154
Appears in Collections  
2020-2020, Investigation of submarine resource environment and seabed methane release in the Arctic (20-20) / Jin, Young Keun (PM20050)
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