Mercury flux to sediments of Lake Tahoe, California-Nevada

Paul E. Drevnick, Avery L.C. Shinneman, Carl H. Lamborg, Daniel R. Engstrom, Michael H. Bothner, James T. Oris

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

We report estimates of mercury (Hg) flux to the sediments of Lake Tahoe, California-Nevada: 2 and 15-20 μg/m2/year in preindustrial and modern sediments, respectively. These values result in a modern to preindustrial flux ratio of 7.5-10, which is similar to flux ratios recently reported for other alpine lakes in California, and greater than the value of 3 typically seen worldwide. We offer plausible hypotheses to explain the high flux ratios, including (1) proportionally less photoreduction and evasion of Hg with the onset of cultural eutrophication and (2) a combination of enhanced regional oxidation of gaseous elemental Hg and transport of the resulting reactive gaseous Hg to the surface with nightly downslope flows of air. If either of these mechanisms is correct, it could lead to local/regional solutions to lessen the impact of globally increasing anthropogenic emissions of Hg on Lake Tahoe and other alpine ecosystems.

Original languageEnglish (US)
Pages (from-to)399-407
Number of pages9
JournalWater, Air, and Soil Pollution
Volume210
Issue number1-4
DOIs
StatePublished - Jul 1 2010
Externally publishedYes

Bibliographical note

Funding Information:
Acknowledgements Brant Allen, Aaron Roberts, Brent Yelle, and Michael Casso helped with field and lab work. John Crusius and Nelson O’Driscoll gave useful advice for sediment and evasion modeling, respectively. Funding was provided by Miami University, EPA-STAR, the Postdoctoral Scholar Program at Woods Hole Oceanographic Institution, and the USGS.

Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.

Keywords

  • Alpine
  • Lake Tahoe
  • Mercury
  • Sediment

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