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Mercury in the marine environment of the Canadian Arctic : review of recent findings

Braune Birgit, Chételat John, Amyot Marc, Brown Tanya, Clayden Meredith, Evans Marlene, Fisk Aaron, Gaden Ashley, Girard Catherine, Hare Alex, Kirk Jane, Lehnherr Igor, Letcher Robert, Loseto Lisa, Macdonald Robie, Mann Erin, McMeans Bailey, Muir Derek, O'Driscoll Nelson, Poulain Alexandre, Reimer Ken et Stern Gary. (2015). Mercury in the marine environment of the Canadian Arctic : review of recent findings. Science of The Total Environment, 509-510, p. 67-90.

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URL officielle: http://dx.doi.org/doi:10.1016/j.scitotenv.2014.05....

Résumé

This review summarizes data and information which have been generated on mercury (Hg) in the marine environment of the Canadian Arctic since the previous Canadian Arctic Contaminants Assessment Report (CACAR) was released in 2003. Much new information has been collected on Hg concentrations in marine water, snow and ice in the Canadian Arctic. The first measurements of methylation rates in Arctic seawater indicate that the water column is an important site for Hg methylation. Arctic marine waters were also found to be a substantial source of gaseous Hg to the atmosphere during the ice-free season. High Hg concentrations have been found in marine snow as a result of deposition following atmospheric mercury depletion events, although much of this Hg is photoreduced and re-emitted back to the atmosphere. The most extensive sampling of marine sediments in the Canadian Arctic was carried out in Hudson Bay where sediment total Hg (THg) concentrations were low compared with other marine regions in the circumpolar Arctic. Mass balance models have been developed to provide quantitative estimates of THg fluxes into and out of the Arctic Ocean and Hudson Bay.

Several recent studies on Hg biomagnification have improved our understanding of trophic transfer of Hg through marine food webs. Over the past several decades, Hg concentrations have increased in some marine biota, while other populations showed no temporal change. Marine biota also exhibited considerable geographic variation in Hg concentrations with ringed seals, beluga and polar bears from the Beaufort Sea region having higher Hg concentrations compared with other parts of the Canadian Arctic. The drivers of these variable patterns of Hg bioaccumulation, both regionally and temporally, within the Canadian Arctic remain unclear. Further research is needed to identify the underlying processes including the interplay between biogeochemical and food web processes and climate change.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:00489697
Volume:509-510
Pages:p. 67-90
Version évaluée par les pairs:Oui
Date:2015
Identifiant unique:10.1016/j.scitotenv.2014.05.133
Sujets:Sciences naturelles et génie > Sciences appliquées > Eau et environnement
Sciences naturelles et génie > Sciences appliquées > Océanographie
Sciences naturelles et génie > Sciences naturelles > Chimie
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:Canadian Arctic, mercury, marine environment, biogeochemical processes, food webs, temporal trends, Arctique canadien, mercure, milieu marin, processus biogéochimiques, réseau trophique, tendances temporelles
Déposé le:26 juill. 2021 13:26
Dernière modification:26 juill. 2021 13:26
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