Distributions and fluxes of methylmercury in the East/Japan Sea

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Publisher: Elsevier B.V.
Document Type: Report
Length: 489 words

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To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1016/j.dsr.2017.10.009 Byline: Jisook Yang (a), Hyunji Kim (a,b), Chang-Keun Kang (a), Kyung-Ryul Kim (a), Seunghee Han [shan@gist.ac.kr] (a,*) Keywords Methylmercury; Methylation; Ventilation; East/Japan Sea; Apparent oxygen utilization Highlights * MeHg in deep water of EJS was significantly higher that at the same depth of North Pacific. * There was a net methylation in the EJS deep water according to mass budgets estimation. * A net methylation in deep water is attributable to the short overturning period of the EJS. Abstract The East/Japan Sea (EJS) is well ventilated to deep water via brine rejection from ice formations and thermohaline convection, resulting in a short overturning period in several decades. Due to these characteristics, the dissolved oxygen concentration in the EJS deep water is much higher (190--200 [mu]g L.sup.-1 at 3000 m water depth) than that found at the same depths of the Northwestern Pacific (30 [mu]g L.sup.-1) or anywhere in the Pacific Ocean. The total mercury (THg) and methylmercury (MeHg) distributions, and MeHg mass budgets were investigated to identify how the EJS's distinct circulation pattern affects Hg speciation. Whereas the THg concentration in the surface seawater (ranging from 0.20 to 1.2 pM, mean 0.59 [plus or minus] 0.24 pM) showed no site variation between the Japan Basin and the Ulleung Basin, the MeHg concentration in the surface seawater was significantly higher (p Author Affiliation: (a) School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea (b) Seoul Center, Korea Basic Science Institute (KBSI), Seoul 02855, Republic of Korea * Corresponding author. Article History: Received 4 April 2017; Revised 5 September 2017; Accepted 12 October 2017

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Gale Document Number: GALE|A554472688