Safe Food Preparation
Thermal Stratification in Lakes
Large bodies of water often have layers with different temperatures. In the summer, the top layer (epilimnion) is warmer than the bottom layer (hypolimnion). The boundary between the upper and lower layers is called the thermocline. Winter approaches and the upper layer cools, eliminating the thermocline. Winds create circulation and the top and bottom regions will mix (called fall overturn). In the spring, the temperature of the upper layer (now the coolest layer) warms and the layers mix in what is called the spring overturn. The mixing of oxygen and other nutrients between the upper and lower regions during seasonal overturns supplies essential ingredients for organisms in lake ecosystems.
Keywords: ecosystem | environmental systems | lakes | thermacline | thermal stratification | ecology
- Raven, P. H. & Johnson, G. B. (2002). Biology (6th ed.). McGraw-Hill.
- Campbell, N. E., & Reece, J. B. (2002). Biology (6th ed.). San Francisco: Benjamin Cummings.
- Young, M. (2004). Thermal Stratification in Lakes. Baylor College of Medicine, Center For Educational Outreach.
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My Health My World: National Dissemination
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The Environment as a Context for Opportunities in Schools
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