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Stratification of very deep, thermally stratified lakes

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Title: Stratification of very deep, thermally stratified lakes
Other Titles: Very deep, thermally stratified lakes
Authors: Boehrer, Bertram Browse this author
Fukuyama, Ryuji Browse this author
Chikita, Kazuhisa Browse this author →KAKEN DB
Keywords: physical limnology
stratification
deep water
meromixis
thermobaric effect
Issue Date: Aug-2008
Publisher: American Geophysical Union
Journal Title: Geophysical Research Letters
Volume: 35
Issue: 16
Start Page: L16405
Publisher DOI: 10.1029/2008GL034519
Abstract: In very deep freshwater lakes, deep recirculation presents itself with remarkable differences to shallower lakes. We consider the stratification where density gradients are exclusively due to temperature differences. The annual circulation patterns are discussed for various climatic conditions. Very deep lakes do not necessarily produce full overturns during Tmd transition in autumn and spring. Peculiarities of the stratification are derived for cases, in which surface temperatures cross 4℃ during the annual cycle: Firstly, the asymmetry between autumn and spring circulation, secondly, the proximity of temperature to the Tmd profile, and thirdly, the isothermal deep water. We compare conceptual model results of horizontally homogeneous lakes with measurements in very deep caldera lakes in Japan (Lakes Ikeda, Tazawa, Toya, Kuttara and Shikotsu). Between oligomictic lakes and thermobarically stratified lakes, we have found lakes circulating reliably despite their enormous depth. We discuss susceptibility to climate variability supported by comparisons with single point measurements from the 1920s and 1930s.
Rights: An edited version of this paper was published by AGU. Copyright 2008 American Geophysical Union.
Type: article (author version)
URI: http://hdl.handle.net/2115/35062
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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