Mercury Flux to Sediments of Lake Tahoe, California-Nevada

被引:15
作者
Drevnick, Paul E. [1 ,2 ,3 ]
Shinneman, Avery L. C. [4 ]
Lamborg, Carl H. [2 ]
Engstrom, Daniel R. [5 ]
Bothner, Michael H. [6 ]
Oris, James T. [1 ]
机构
[1] Miami Univ, Dept Zool, Oxford, OH 45056 USA
[2] Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, Woods Hole, MA 02543 USA
[3] Univ Quebec, INRS ETE, Quebec City, PQ G1K 9A9, Canada
[4] Univ Minnesota, Dept Geol & Geophys, Minneapolis, MN 55455 USA
[5] Sci Museum Minnesota, St Croix Watershed Res Stn, Marine St Croix, MN 55047 USA
[6] US Geol Survey, Woods Hole Sci Ctr, Woods Hole, MA 02543 USA
关键词
Mercury; Sediment; Lake Tahoe; Alpine; ATMOSPHERIC MERCURY; DEPOSITION; PB-210; RECORD; SILVER; GOLD; OH;
D O I
10.1007/s11270-009-0262-y
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
We report estimates of mercury (Hg) flux to the sediments of Lake Tahoe, California-Nevada: 2 and 15-20 A mu g/m(2)/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.
引用
收藏
页码:399 / 407
页数:9
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