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Mercury Export from Arctic Great Rivers.

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Arctic rivers export significant mercury (Hg), with major rivers discharging 20,000 kg annually. Most mercury export occurs during spring and summer, highlighting the impact of changing Arctic hydrology.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Arctic Research

Background:

  • The Arctic Ocean receives substantial global river discharge, yet mercury (Hg) export estimates are limited.
  • Understanding land-ocean linkages is crucial in the rapidly changing Arctic.

Purpose of the Study:

  • To establish a contemporary benchmark for riverine total mercury (THg) export from major Arctic rivers.
  • To quantify pan-Arctic THg flux and identify key drivers of mercury mobilization and transport.

Main Methods:

  • Coordinated, year-round sampling of six major Arctic rivers from 2012-2017.
  • Measurement of total mercury (THg) concentrations and fluxes.
  • Analysis of hydrological and sediment data to model THg export.

Main Results:

  • The six major Arctic rivers exported an average of 20,000 kg/year of THg.
  • Pan-Arctic THg flux was estimated at 37,000 kg/year, with over 90% during spring/summer discharge.
  • Higher THg yields correlated with increased watershed denudation.

Conclusions:

  • Established a contemporary benchmark for Arctic riverine mercury export.
  • Highlighted the critical role of seasonal discharge and watershed characteristics in mercury transport.
  • Emphasized the potential acceleration of mercury cycling due to Arctic warming and permafrost thaw.