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Limnol. Oceanogr., 41(4), 1996,707-721 0 1996, by the American Society of Limnology and Oceanography, Inc.
 

Summary: Limnol. Oceanogr., 41(4), 1996,707-721
0 1996, by the American Society of Limnology and Oceanography, Inc.
Density-driven exchange between the basins of Lake Lucerne
(Switzerland) traced with the 3H-3He method
W. Aeschbach-Hertig, R. Kipfer, A-f.Hofer, and D. AL Imboden
Environmental Physics, Swiss Federal Institute of Technology (ETH), Swiss Federal Institute for Environmental
Science and Technology (EAWAG), CH-8600 Diibendorf, Switzerland
H. Baur
Isotope Geology, Swiss Federal Institute of Technology, NO C61, CH-8902 Zurich, Switzerland
Abstract
Lab: Lucerne is divided by sills into four major and two minor basins. During winter, differential vertical
mixing due to non-uniform wind exposure and different total dissolved solid concentrations in the main
tributaries of the lake causeconsiderable interbasin density gradients. These gradients induce density-driven
currents across the sills that contribute significantly to the deep water exchange in the basins and gradually
reduce the density gradients during summer.
Over a period of 2 yr (1990-1992), the spatial and temporal evolution of water density and water age
(measured by the 3H-3He method) was investigated. Variation in water agebetween the different basins and
the occasional occurrence of age inversions (older water overlying younger one) can be explained in terms
of the observed density distribution and the exchange flows the density gradients cause.Water ageprovides
an integral measure of the magnitude of deep-water renewal, which in some basins can be roughly separated

  

Source: Aeschbach-Hertig, Werner - Institut für Umweltphysik, Universität Heidelberg

 

Collections: Geosciences; Environmental Sciences and Ecology