globalchange  > 气候变化事实与影响
DOI: 10.1002/2017GB005700
Scopus记录号: 2-s2.0-85045202999
论文题名:
Mercury in the Black Sea: New Insights From Measurements and Numerical Modeling
作者: Rosati G; , Heimbürger L; E; , Melaku Canu D; , Lagane C; , Laffont L; , Rijkenberg M; J; A; , Gerringa L; J; A; , Solidoro C; , Gencarelli C; N; , Hedgecock I; M; , De Baar H; J; W; , Sonke J; E
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2018
语种: 英语
英文关键词: Anoxia ; GEOTRACES ; Mercury ; Methylation ; Methylmercury ; Sulfide
英文摘要: Redox conditions and organic matter control marine methylmercury (MeHg) production. The Black Sea is the world's largest and deepest anoxic basin and is thus ideal to study Hg species along the extended redox gradient. Here we present new dissolved Hg and MeHg data from the 2013 GEOTRACES MEDBlack cruise (GN04_leg2) that we integrated into a numerical 1-D model, to track the fate and dynamics of Hg and MeHg. Contrary to a previous study, our new data show highest MeHg concentrations in the permanently anoxic waters. Observed MeHg/Hg percentage (range 9-57%) in the anoxic waters is comparable to other subsurface maxima in oxic open-ocean waters. With the modeling we tested for various Hg methylation and demethylation scenarios along the redox gradient. The results show that Hg methylation must occur in the anoxic waters. The model was then used to simulate the time evolution (1850-2050) of Hg species in the Black Sea. Our findings quantify (1) inputs and outputs of HgT (~31 and ~28 kmol yr-1) and MeHgT (~5 and ~4 kmol yr-1) to the basin, (2) the extent of net demethylation occurring in oxic (~1 kmol yr-1) and suboxic water (~6 kmol yr-1), (3) and the net Hg methylation in the anoxic waters of the Black Sea (~11 kmol yr-1). The model was also used to estimate the amount of anthropogenic Hg (85-93%) in the Black Sea. ©2018. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77683
Appears in Collections:气候变化事实与影响

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作者单位: OGS, National Institute of Oceanography and Experimental Geophysics, OCE Research Section, ECHO Group Trieste Italy; Department of Life Sciences University of Trieste Trieste Italy; Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography UM 110 Marseille France; Observatoire Midi-Pyrénées, Laboratoire Géosciences Environnement Toulouse, CNRS/IRD/Université Paul-Sabatier Toulouse France; NIOZ, Royal Institute for Sea Research, department of GCO Utrecht University Den Burg Netherlands; ICTP, The Abdus Salam International Centre for Theoretical Physics Trieste Italy; CNR, Institute of Atmospheric Pollution Research, Division of Rende, UNICAL-Polifunzionale Rende Italy

Recommended Citation:
Rosati G,, Heimbürger L,E,et al. Mercury in the Black Sea: New Insights From Measurements and Numerical Modeling[J]. Global Biogeochemical Cycles,2018-01-01
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