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unknown
Mercury flux to sediments of Lake Tahoe, California-Nevada
Authors
AC Heyvaert
AE Draut
+52 more
AR Schwindt
Avery L. C. Shinneman
BA Bergquist
California Air Resources Board
Carl H. Lamborg
CH Lamborg
CJ Watras
CN Alpers
CR Goldman
DA Osleger
Daniel R. Engstrom
DF Palmer
DH Landers
EB Swain
EG Pacyna
G Southworth
I Renberg
J Crusius
J Rydberg
James T. Oris
JD Eakins
JG Calvert
JG Kim
JG Kim
JG Murphy
JM Blais
JO Nriagu
JP Smol
M Amyot
M Koide
Michael H. Bothner
MS Landis
National Atmospheric Deposition Program
NE Selin
NE Selin
NJ Hyne
O Heiri
Paul E. Drevnick
PC Metre Van
PC Swartzendruber
PF Schuster
PG Appleby
PW Moran
RB Davis
RD Sanders
S Chandra
S Lindberg
S Sillman
S Strode
SN Lyman
WF Fitzgerald
Y Wang
Publication date
12 August 2009
Publisher
'Springer Science and Business Media LLC'
Doi
Cite
Abstract
Author Posting. © The Author(s), 2009. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Water, Air, & Soil Pollution 210 (2010): 399-407, doi:10.1007/s11270-009-0262-y.We report estimates of mercury (Hg) flux to the sediments of Lake Tahoe, California-Nevada: 2 and 15-20 µg/m2/yr 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.Funding was provided by Miami University, EPA-STAR, the Postdoctoral Scholar Program at Woods Hole Oceanographic Institution, and the USGS
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