One of the mysteries of the English language finally explained.
The lower layer of water in a stratified lake, typically cooler than the water above and relatively stagnant.
- ‘These lakes have permanent thermoclines, small littoral zones, and deep hypolimnia.’
- ‘MeHg accumulated in the hypolimnion of Lake 240 when oxygen was present.’
- ‘For the higher concentrations of nitrate and oxygen in the hypolimnion during weeks 15 to 25, another mechanism might be efficacious.’
- ‘The mean acoustic size of rising bubbles decreased in the hypolimnion but increased in the epilimnion.’
- ‘Both ponds are dystrophic, surrounded by extensive mats of Sphagnum, and stratified in summer with anoxic hypolimnia.’
Early 20th century: from hypo- ‘below’ + Greek limnion (diminutive of limnē ‘lake’).
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