Hypolimnion

n. (in thermally stratified lakes) non-circulating layer of water located below the thermocline and characterized by uniformly cold temperatures and low oxygen levels

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.
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Bottom waters of a thermally stratified lake. The hypolimnion of a eutrophic lake is usually low or lacking in oxygen.

B: (Kimia) hipolimnion
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B: (Biologi) hipolimnion
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