The layer of water in a thermally stratified lake that lies below the thermocline, is noncirculating, and remains perpetually cold.
[HYPO– + Greek limnē, lake, pool.]
hypolimnetic hy'po·lim·net'ic (-lĭm-nĕt'ĭk) or hy'po·lim'ni·al adj.
hypolimnion
Dictionary:
hy·po·lim·ni·on (hī'pə-lĭm'nē-ŏn', -ən)  |
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| Geography Dictionary: hypolimnion |
The lower layers in a body of water which are marked by low temperatures and insufficient light for photosynthesis. Levels of dissolved oxygen are low.
| Wikipedia: Hypolimnion |
The hypolimnion is the dense, bottom layer of water in a thermally-stratified lake. It is the layer that lies below the thermocline.
Typically the hypolimnion is the coldest layer of a lake in summer, and the warmest layer during winter. Being at depth, it is isolated from surface wind-mixing during summer, and usually receives insufficient irradiance (light) for photosynthesis to occur.
In deep, temperate lakes, the bottom-most waters of the hypolimnion are typically close to 4°C throughout the year. The hypolimnion may be much warmer in lakes at warmer latitudes.
The word "hypolimnion" is one of the longest words that can be typed with only the right hand on a QWERTY and AZERTY keyboard.
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 | Fresh-water ecosystem (ecology) |
| Epilimnion |
| Lake stratification |
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 | Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved. Read more |
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| Geography Dictionary. A Dictionary of Geography. Copyright © Susan Mayhew 1992, 1997, 2004. All rights reserved. Read more |
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| Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Hypolimnion". Read more |
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