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Karina L Lecomte1, Paula A Vignoni2, Cecilia V Echegoyen3

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Geochemical surveys in Antarctic lakes reveal that weathering and meltwater influence solute composition. Volcanic mineral weathering is a key source, with some trace metals potentially indicating atmospheric pollution.

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Area of Science:

  • Geochemistry
  • Limnology
  • Environmental Science

Background:

  • Pristine high-latitude lacustrine systems offer unique insights into geochemical weathering.
  • Antarctic Peninsula's Clearwater Mesa provides an ideal natural laboratory for studying solute dynamics.

Purpose of the Study:

  • To determine the primary controls on solute composition in Antarctic lakes.
  • To investigate geochemical weathering processes in a high-latitude environment.

Main Methods:

  • Conducted a geochemical survey of 35 lakes on James Ross Island.
  • Analyzed physico-chemical parameters, total dissolved solids (TDS), and trace metal abundances.
  • Utilized geochemical modeling on connected lake systems.

Main Results:

  • Observed neutral to alkaline waters with TDS < 2500 mg/L.
  • Identified weathering and meltwater as key drivers of solute composition.
  • Trace metals suggest volcanic mineral weathering, with potential atmospheric inputs for Pb and Zn.
  • Geochemical modeling indicated weathering of salts, carbonates, and silicates, with significant CO2 consumption (20-30%).

Conclusions:

  • Solute composition is controlled by a combination of weathering and meltwater inputs.
  • Pristine Antarctic lakes provide baseline data for future pollution and climate change impact studies.
  • Geochemical processes, including CO2 consumption, are active in these unique environments.