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Mercury stable isotopes constrain atmospheric sources to the ocean.
Jiskra, Martin; Heimbürger-Boavida, Lars-Eric; Desgranges, Marie-Maëlle; Petrova, Mariia V; Dufour, Aurélie; Ferreira-Araujo, Beatriz; Masbou, Jérémy; Chmeleff, Jérôme; Thyssen, Melilotus; Point, David; Sonke, Jeroen E.
Afiliación
  • Jiskra M; Environmental Geosciences, University of Basel, Basel, Switzerland. martin.jiskra@unibas.ch.
  • Heimbürger-Boavida LE; Géosciences Environnement Toulouse, CNRS/IRD/Université Paul Sabatier Toulouse III, Toulouse, France. martin.jiskra@unibas.ch.
  • Desgranges MM; Géosciences Environnement Toulouse, CNRS/IRD/Université Paul Sabatier Toulouse III, Toulouse, France. lars-eric.heimburger@mio.osupytheas.fr.
  • Petrova MV; Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO) UM 110, Marseille, France. lars-eric.heimburger@mio.osupytheas.fr.
  • Dufour A; Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO) UM 110, Marseille, France.
  • Ferreira-Araujo B; Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO) UM 110, Marseille, France.
  • Masbou J; Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO) UM 110, Marseille, France.
  • Chmeleff J; Géosciences Environnement Toulouse, CNRS/IRD/Université Paul Sabatier Toulouse III, Toulouse, France.
  • Thyssen M; Géosciences Environnement Toulouse, CNRS/IRD/Université Paul Sabatier Toulouse III, Toulouse, France.
  • Point D; Institut Terre et Environnement de Strasbourg, Université de Strasbourg/EOST/ENGEES/CNRS, Strasbourg, France.
  • Sonke JE; Géosciences Environnement Toulouse, CNRS/IRD/Université Paul Sabatier Toulouse III, Toulouse, France.
Nature ; 597(7878): 678-682, 2021 09.
Article en En | MEDLINE | ID: mdl-34588669
ABSTRACT
Human exposure to toxic mercury (Hg) is dominated by the consumption of seafood1,2. Earth system models suggest that Hg in marine ecosystems is supplied by atmospheric wet and dry Hg(II) deposition, with a three times smaller contribution from gaseous Hg(0) uptake3,4. Observations of marine Hg(II) deposition and Hg(0) gas exchange are sparse, however5, leaving the suggested importance of Hg(II) deposition6 ill-constrained. Here we present the first Hg stable isotope measurements of total Hg (tHg) in surface and deep Atlantic and Mediterranean seawater and use them to quantify atmospheric Hg deposition pathways. We observe overall similar tHg isotope compositions, with median Δ200Hg signatures of 0.02‰, lying in between atmospheric Hg(0) and Hg(II) deposition end-members. We use a Δ200Hg isotope mass balance to estimate that seawater tHg can be explained by the mixing of 42% (median; interquartile range, 24-50%) atmospheric Hg(II) gross deposition and 58% (50-76%) Hg(0) gross uptake. We measure and compile additional, global marine Hg isotope data including particulate Hg, sediments and biota and observe a latitudinal Δ200Hg gradient that indicates larger ocean Hg(0) uptake at high latitudes. Our findings suggest that global atmospheric Hg(0) uptake by the oceans is equal to Hg(II) deposition, which has implications for our understanding of atmospheric Hg dispersal and marine ecosystem recovery.

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Nature Año: 2021 Tipo del documento: Article País de afiliación: Suiza

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Nature Año: 2021 Tipo del documento: Article País de afiliación: Suiza
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