Figure 4. Typical temperature profile from a stratified lake in the temperate zone, showing the division of the water into three layers of different density

From

The Use of an Aeration System to Prevent Thermal Stratification of Water Bodies: Pond, Lake and Water Supply Reservoir

Md. Saidul Azam Chowdhury, Khairul Hasan, Kaosar Alam

Applied Ecology and Environmental Sciences. 2014, 2(1), 1-7 doi:10.12691/aees-2-1-1