The Warming of Lake Tahoe |
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Authors: | Robert Coats Joaquim Perez-Losada Geoffrey Schladow Robert Richards Charles Goldman |
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Institution: | (1) Hydroikos Ltd., 2560 9th St., Ste. 216, Berkeley, California 94710, USA;(2) Departament Fisica, Universitat de Girona, Girona, Spain;(3) Department of Civil and Environmental Engineering, University of California, Davis, California 95616, USA;(4) Department of Environmental Science and Policy, University of California, Davis, California 95616, USA |
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Abstract: | Summary We investigated the effects of climate variability on the thermal structure of Lake Tahoe, California-Nevada, 1970–2002, and
with principal components analysis and step-wise multiple regression, related the volume-weighed average lake temperature
to trends in climate. We then used a 1-dimensional hydrodynamic model to show that the observed trends in the climatic forcing
variables can reasonably explain the observed changes in the lake. Between 1970 and 2002, the volume-weighted mean temperature
of the lake increased at an average rate of 0.015 ∘C yr−1. Trends in the climatic drivers include 1) upward trends in maximum and minimum daily air temperature at Tahoe City; and
2) a slight upward trend in downward long-wave radiation. Changes in the thermal structure of the lake include 1) a long-term
warming trend, with the highest rates near the surface and at 400 m; 2) an increase in the resistance of the lake to mixing
and stratification, as measured by the Schmidt Stability and Birge Work; 3) a trend toward decreasing depth of the October
thermocline. The long-term changes in the thermal structure of Lake Tahoe may interact with and exacerbate the well-documented
trends in the lake's clarity and primary productivity. |
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