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Title: Turbulent mixing in the hypolimnion of Baldeggersee (Switzerland) traced by natural radon-222

Abstract

Three analytical diffusion models are used to describe the distribution of a nonconservative tracer in the hypolimnion of a lake: the one-dimensional vertical (1-DV) model, developed for tracers in the deep sea, leads to a significant overestimation of vertical diffusivity K/sub z/ in lakes; the one-dimensional topographic vertical (1-DTV) model, applicable if horizontal mixing is fast compared to in situ decay, demonstrates that, except for the deepest layers, vertical tracer distributions are insensitive to K/sub z/; the one-dimensional topographic horizontal (1-DTH) model, in which horizontal mixing is incomplete and vertical diffusion is disregarded, is the appropriate model for the interpretation of vertical excess /sup 222/Rn profiles a few meters above the lake bottom. The radon flux F from the bottom is calculated from /sup 226/Ra in the sediments and corrected for depth variation of porosity and radium activity. Horizontal diffusivity in the hypolimnion decreases from June to October; vertical diffusivity is roughly 10 times larger than values calculated from temperature in the upper hypolimnion. The large K/sub z/ and the transient, often irregular shape of the radon profiles are the result of horizontal bottom currents previously measured by other methods.

Authors:
;
Publication Date:
Research Org.:
Swiss Federal Inst. of Tech., Duebendorf
OSTI Identifier:
6138322
Resource Type:
Journal Article
Journal Name:
Limnol. Oceanogr.; (United States)
Additional Journal Information:
Journal Volume: 29:4
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; LAKES; MIXING; RADON 222; DIFFUSION; COASTAL WATERS; MATHEMATICAL MODELS; RADIUM 226; SEDIMENTS; SPATIAL DISTRIBUTION; SWITZERLAND; TRACER TECHNIQUES; TURBULENCE; ALKALINE EARTH ISOTOPES; ALPHA DECAY RADIOISOTOPES; DAYS LIVING RADIOISOTOPES; DISTRIBUTION; EUROPE; EVEN-EVEN NUCLEI; HEAVY NUCLEI; ISOTOPE APPLICATIONS; ISOTOPES; NUCLEI; RADIOISOTOPES; RADIUM ISOTOPES; RADON ISOTOPES; SURFACE WATERS; WESTERN EUROPE; YEARS LIVING RADIOISOTOPES; 520101* - Environment, Aquatic- Basic Studies- Radiometric Techniques- (-1989)

Citation Formats

Imboden, D M, and Joller, T. Turbulent mixing in the hypolimnion of Baldeggersee (Switzerland) traced by natural radon-222. United States: N. p., 1984. Web. doi:10.4319/lo.1984.29.4.0831.
Imboden, D M, & Joller, T. Turbulent mixing in the hypolimnion of Baldeggersee (Switzerland) traced by natural radon-222. United States. doi:10.4319/lo.1984.29.4.0831.
Imboden, D M, and Joller, T. Sun . "Turbulent mixing in the hypolimnion of Baldeggersee (Switzerland) traced by natural radon-222". United States. doi:10.4319/lo.1984.29.4.0831.
@article{osti_6138322,
title = {Turbulent mixing in the hypolimnion of Baldeggersee (Switzerland) traced by natural radon-222},
author = {Imboden, D M and Joller, T},
abstractNote = {Three analytical diffusion models are used to describe the distribution of a nonconservative tracer in the hypolimnion of a lake: the one-dimensional vertical (1-DV) model, developed for tracers in the deep sea, leads to a significant overestimation of vertical diffusivity K/sub z/ in lakes; the one-dimensional topographic vertical (1-DTV) model, applicable if horizontal mixing is fast compared to in situ decay, demonstrates that, except for the deepest layers, vertical tracer distributions are insensitive to K/sub z/; the one-dimensional topographic horizontal (1-DTH) model, in which horizontal mixing is incomplete and vertical diffusion is disregarded, is the appropriate model for the interpretation of vertical excess /sup 222/Rn profiles a few meters above the lake bottom. The radon flux F from the bottom is calculated from /sup 226/Ra in the sediments and corrected for depth variation of porosity and radium activity. Horizontal diffusivity in the hypolimnion decreases from June to October; vertical diffusivity is roughly 10 times larger than values calculated from temperature in the upper hypolimnion. The large K/sub z/ and the transient, often irregular shape of the radon profiles are the result of horizontal bottom currents previously measured by other methods.},
doi = {10.4319/lo.1984.29.4.0831},
journal = {Limnol. Oceanogr.; (United States)},
number = ,
volume = 29:4,
place = {United States},
year = {1984},
month = {7}
}