Methylmercury photodegradation influenced by sea-ice cover in Arctic marine ecosystems
cited By 71 International audience Atmospheric deposition of mercury to remote areas has increased threefold since pre-industrial times. Mercury deposition is particularly pronounced in the Arctic. Following deposition to surface oceans and sea ice, mercury can be converted into methylmercury, a bio...
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Online Access: | https://hal.archives-ouvertes.fr/hal-01590299 https://doi.org/10.1038/ngeo1049 |
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ftccsdartic:oai:HAL:hal-01590299v1 2023-05-15T14:48:14+02:00 Methylmercury photodegradation influenced by sea-ice cover in Arctic marine ecosystems Point, David Sonke, J.E. Day, R.D. Roseneau, D.G. Hobson, K.A. Vander Pol, S.S. Moors, A.J. Pugh, R.S. Donard, O.F.X. Becker, P.R. Laboratoire de Chimie Analytique Bio-Inorganique et Environnement (LCABIE) Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS) Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux (IPREM) Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) 2011 https://hal.archives-ouvertes.fr/hal-01590299 https://doi.org/10.1038/ngeo1049 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/ngeo1049 hal-01590299 https://hal.archives-ouvertes.fr/hal-01590299 doi:10.1038/ngeo1049 ISSN: 1752-0894 Nature Geoscience https://hal.archives-ouvertes.fr/hal-01590299 Nature Geoscience, Nature Publishing Group, 2011, 4 (3), pp.188-194. ⟨10.1038/ngeo1049⟩ [CHIM.ANAL]Chemical Sciences/Analytical chemistry info:eu-repo/semantics/article Journal articles 2011 ftccsdartic https://doi.org/10.1038/ngeo1049 2021-12-12T03:52:18Z cited By 71 International audience Atmospheric deposition of mercury to remote areas has increased threefold since pre-industrial times. Mercury deposition is particularly pronounced in the Arctic. Following deposition to surface oceans and sea ice, mercury can be converted into methylmercury, a biologically accessible form of the toxin, which biomagnifies along the marine food chain. Mass-independent fractionation of mercury isotopes accompanies the photochemical breakdown of methylmercury to less bioavailable forms in surface waters. Here we examine the isotopic composition of mercury in seabird eggs collected from colonies in the North Pacific Ocean, the Bering Sea and the western Arctic Ocean, to determine geographical variations in methylmercury breakdown at northern latitudes. We find evidence for mass-independent fractionation of mercury isotopes. The degree of mass-independent fractionation declines with latitude. Foraging behaviour and geographic variations in mercury sources and solar radiation fluxes were unable to explain the latitudinal gradient. However, mass-independent fractionation was negatively correlated with sea-ice cover. We conclude that sea-ice cover impedes the photochemical breakdown of methylmercury in surface waters, and suggest that further loss of Arctic sea ice this century will accelerate sunlight-induced breakdown of methylmercury in northern surface waters. © 2011 Macmillan Publishers Limited. All rights reserved. Article in Journal/Newspaper Arctic Arctic Ocean Bering Sea Sea ice Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Arctic Ocean Bering Sea Pacific Nature Geoscience 4 3 188 194 |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[CHIM.ANAL]Chemical Sciences/Analytical chemistry |
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[CHIM.ANAL]Chemical Sciences/Analytical chemistry Point, David Sonke, J.E. Day, R.D. Roseneau, D.G. Hobson, K.A. Vander Pol, S.S. Moors, A.J. Pugh, R.S. Donard, O.F.X. Becker, P.R. Methylmercury photodegradation influenced by sea-ice cover in Arctic marine ecosystems |
topic_facet |
[CHIM.ANAL]Chemical Sciences/Analytical chemistry |
description |
cited By 71 International audience Atmospheric deposition of mercury to remote areas has increased threefold since pre-industrial times. Mercury deposition is particularly pronounced in the Arctic. Following deposition to surface oceans and sea ice, mercury can be converted into methylmercury, a biologically accessible form of the toxin, which biomagnifies along the marine food chain. Mass-independent fractionation of mercury isotopes accompanies the photochemical breakdown of methylmercury to less bioavailable forms in surface waters. Here we examine the isotopic composition of mercury in seabird eggs collected from colonies in the North Pacific Ocean, the Bering Sea and the western Arctic Ocean, to determine geographical variations in methylmercury breakdown at northern latitudes. We find evidence for mass-independent fractionation of mercury isotopes. The degree of mass-independent fractionation declines with latitude. Foraging behaviour and geographic variations in mercury sources and solar radiation fluxes were unable to explain the latitudinal gradient. However, mass-independent fractionation was negatively correlated with sea-ice cover. We conclude that sea-ice cover impedes the photochemical breakdown of methylmercury in surface waters, and suggest that further loss of Arctic sea ice this century will accelerate sunlight-induced breakdown of methylmercury in northern surface waters. © 2011 Macmillan Publishers Limited. All rights reserved. |
author2 |
Laboratoire de Chimie Analytique Bio-Inorganique et Environnement (LCABIE) Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS) Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux (IPREM) Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Point, David Sonke, J.E. Day, R.D. Roseneau, D.G. Hobson, K.A. Vander Pol, S.S. Moors, A.J. Pugh, R.S. Donard, O.F.X. Becker, P.R. |
author_facet |
Point, David Sonke, J.E. Day, R.D. Roseneau, D.G. Hobson, K.A. Vander Pol, S.S. Moors, A.J. Pugh, R.S. Donard, O.F.X. Becker, P.R. |
author_sort |
Point, David |
title |
Methylmercury photodegradation influenced by sea-ice cover in Arctic marine ecosystems |
title_short |
Methylmercury photodegradation influenced by sea-ice cover in Arctic marine ecosystems |
title_full |
Methylmercury photodegradation influenced by sea-ice cover in Arctic marine ecosystems |
title_fullStr |
Methylmercury photodegradation influenced by sea-ice cover in Arctic marine ecosystems |
title_full_unstemmed |
Methylmercury photodegradation influenced by sea-ice cover in Arctic marine ecosystems |
title_sort |
methylmercury photodegradation influenced by sea-ice cover in arctic marine ecosystems |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.archives-ouvertes.fr/hal-01590299 https://doi.org/10.1038/ngeo1049 |
geographic |
Arctic Arctic Ocean Bering Sea Pacific |
geographic_facet |
Arctic Arctic Ocean Bering Sea Pacific |
genre |
Arctic Arctic Ocean Bering Sea Sea ice |
genre_facet |
Arctic Arctic Ocean Bering Sea Sea ice |
op_source |
ISSN: 1752-0894 Nature Geoscience https://hal.archives-ouvertes.fr/hal-01590299 Nature Geoscience, Nature Publishing Group, 2011, 4 (3), pp.188-194. ⟨10.1038/ngeo1049⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/ngeo1049 hal-01590299 https://hal.archives-ouvertes.fr/hal-01590299 doi:10.1038/ngeo1049 |
op_doi |
https://doi.org/10.1038/ngeo1049 |
container_title |
Nature Geoscience |
container_volume |
4 |
container_issue |
3 |
container_start_page |
188 |
op_container_end_page |
194 |
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1766319319559438336 |