The epilimnion is the top-most layer in a thermally stratified lake, occurring above the deeper hypolimnion. It is warmer and typically has a higher pH and higher dissolved oxygen concentration than the hypolimnion. Being exposed at the surface, it typically becomes turbulently mixed as a result of surface wind-mixing. It is also free to exchange ...
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http://en.wikipedia.org/wiki/Epilimnion
the layer of water above the thermocline
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(from the article `hydrosphere`) Biological processes strongly affect the composition of lake waters and are responsible to a significant degree for the compositional differences ... ...spring and autumn—per year) caused by seasonal differences in temperature and the mixing effects of wind (Figure 2). This type of lake stratifies ....
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http://www.britannica.com/eb/a-z/e/36
The upper region of a thermally stratified lake, above the thermocline, and generally warm and well oxygenated.
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The upper region of a lake, subject to wind mixing. Above the thermocline.
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Upper waters of a thermally stratified lake subject to wind action.
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https://www.encyclo.co.uk/local/20094
(in certain lakes) the layer of water above the thermocline.
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https://www.infoplease.com/dictionary/epilimnion
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