Large mercury release from the Greenland Ice Sheet invalidated

Christian Juncher Jørgensen, Jens Søndergaard, Martin Mørk Larsen, Kristian Kjellerup Kjeldsen, Diogo Rosa, Sarah Elise Sapper, Lars Eric Heimbürger-Boavida, Stephen G. Kohler, Feiyue Wang, Zhiyuan Gao, Debbie Armstrong, Christian Nyrop Albers

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

Resumé

The major input of mercury (Hg) to the Arctic is normally ascribed to long-range transport of anthropogenic Hg emissions. Recently, alarming concentrations of Hg in meltwater from the Greenland Ice Sheet (GrIS) were reported with bedrock as the proposed source. Reported Hg concentrations were 100 to 1000 times higher than in known freshwater systems of Greenland, calling for independent validation of the extraordinary concentrations and conclusions. Here, we present measurements of Hg at 21 glacial outlets in West Greenland showing that extreme Hg concentrations cannot be reproduced. In contrast, we find that meltwater from below the GrIS is very low in Hg, has minor implications for the global Hg budget, and pose only a very limited risk for local communities and the natural environment of Greenland.

OriginalsprogEngelsk
Artikelnummereadi7760
Antal sider8
TidsskriftScience advances
Vol/bind10
Udgave nummer4
DOI
StatusUdgivet - 26 jan. 2024

Programområde

  • Programområde 5: Natur og klima
  • Programområde 4: Mineralske råstoffer

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