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| Littoral zone | |
| Limnetic zone | |
| Profundal zone | |
| Benthic zone | |
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| Epilimnion | |
| Metalimnion | |
| Hypolimnion | |
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| Holomictic lake | |
| Monomictic lake | |
| Dimictic lake | |
| Polymictic lake | |
| Meromictic lake | |
| Amictic lake | |
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Dimictic lakes are holomictic lakes that mix from top to bottom during two mixing periods each year. During winter they are covered by ice. During summer they are thermally stratified, with temperature-derived density differences separating the warm surface waters (the epilimnion), from the colder bottom waters (the hypolimnion).
Mixing typically occurs during the spring and autumn, when the lake is "isothermal" (i.e., at the same temperature from the top to the bottom). At this time the water throughout the lake is about 4°C, and, in the absence of any temperature or density differences, the lake readily mixes from top to bottom. These lakes are common in regions with temperate climates.[1]
References
- ^ Lewis, William M., Jr. (1983). "A revised classification of lakes based on mixing". Canadian Journal of Fisheries and Aquatic Sciences 40 (10): 1779–1787. http://cires.colorado.edu/limnology/pubs/pdfs/Pub058.pdf.
See also
External links
"Circulation: annual patterns of dimictic lakes" at Encyclopædia Britannica Online
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