Climatic Change

, Volume 76, Issue 1, pp 121–148

The Warming of Lake Tahoe

  • Robert Coats
  • Joaquim Perez-Losada
  • Geoffrey Schladow
  • Robert Richards
  • Charles Goldman
Article

DOI: 10.1007/s10584-005-9006-1

Cite this article as:
Coats, R., Perez-Losada, J., Schladow, G. et al. Climatic Change (2006) 76: 121. doi:10.1007/s10584-005-9006-1

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.

Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • Robert Coats
    • 1
  • Joaquim Perez-Losada
    • 2
  • Geoffrey Schladow
    • 3
  • Robert Richards
    • 4
  • Charles Goldman
    • 4
  1. 1.Hydroikos Ltd.BerkeleyUSA
  2. 2.Departament FisicaUniversitat de GironaGironaSpain
  3. 3.Department of Civil and Environmental EngineeringUniversity of CaliforniaDavisUSA
  4. 4.Department of Environmental Science and PolicyUniversity of CaliforniaDavisUSA