Hypolimnion
The hypolimnion (hypolimnial) is the lower layer of water , which is only moved by internal waves and their compensatory currents, and is homogeneously cold at 3.98 ° C in a stratified standing body of water . The hypolimnion is separated from the upper water layer , the epilimnion , by the thermocline, the metalimnion . In lakes that are too shallow, no hypolimnion can form, so that the metalimnion already touches the sea floor at higher temperatures (“metalimnian lakes”). The formation of layers of water occurs due to the density anomaly of the water.