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The upper layer of water in a stratified lake.
- ‘The chemistry of the two parts of a freshwater lake, the epilimnion and the hypolimnion, is affected by biological processes and by circulation.’
- ‘The amount of bacterial cells imported via the inlets in relation to bacterioplankton cells produced in the epilimnion of the lakes was also determined.’
- ‘At each pond, we took two replicate water samples from the epilimnion using an integrated depth sampler; we took samples from the surface to 1.25 m in Monday Bog and to 1.75 m in Wednesday Bog.’
- ‘The sampling depth of 1.5 m was near the midpoint of the epilimnion depth in each lake.’
- ‘Experiments were conducted in the epilimnion of a high-UV system at midday and in late afternoon.’
Early 20th century from epi-‘above’ + Greek limnion (diminutive of limnē ‘lake’).
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