The Dynamics of Temperate Lakes: Understanding Spring Overturn and Thermocline Formation

Mar 01, 2025

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Explore the intricate processes within temperate lakes during spring overturn, where warming and winds drive oxygen and nutrient movements. Learn how the thermocline affects vertical mixing and nutrient distribution, with insights on fall overturn and dissolved oxygen dynamics.

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The Dynamics of Temperate Lakes: Understanding Spring Overturn and Thermocline Formation

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Lecture 14THE BIOSPHERE
Temperate lakes • Spring overturn: • warming & winds cause oxygen to be carried downward & nutrients to be carried to the surface. • During midsummer: • thermocline forms between upper layers & lower cooler layers. • Thermocline prevents vertical mixing between the warmer, oxygen-rich surface layer and the cold, oxygen-poor layer below it. • During fall overturn- thermocline sinks; water mixes vertically; dissolved oxygen moves down & nutrients move up.