Polar firn air reveals large-scale impact of anthropogenic mercury emissions during the 1970s.

  title={Polar firn air reveals large-scale impact of anthropogenic mercury emissions during the 1970s.},
  author={Xavier Fa{\"i}n and Christophe P. Ferrari and Aur{\'e}lien Dommergue and Mary R. Albert and Mark Battle and Jeff Severinghaus and Laurent Arnaud and Jean-Marc Barnola and Warren R L Cairns and C. Barbante and Claude E Boutron},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  volume={106 38},
Mercury (Hg) is an extremely toxic pollutant, and its biogeochemical cycle has been perturbed by anthropogenic emissions during recent centuries. In the atmosphere, gaseous elemental mercury (GEM; Hg degrees ) is the predominant form of mercury (up to 95%). Here we report the evolution of atmospheric levels of GEM in mid- to high-northern latitudes inferred from the interstitial air of firn (perennial snowpack) at Summit, Greenland. GEM concentrations increased rapidly after World War II from… CONTINUE READING

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