bio155_Lecture_4_stratification_watermovements - BIOE 155,...

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BIOE 155, Autumn 2009 PHYSICAL: STRATIFICATION AND WATER MOVEMENTS (read: pp 39-44; 50-56 in Dodson) “In spring the water of the pond is like blue wool, endlessly tossing. The heavy, cold water has sunk to the black bottom of the pond and, struck by this weight, the bottom water stirs and rises, filling the pond’s basins with wild nutrition. . .” (Mary Oliver 1991, as quoted by Dodson) VERTICAL STRATIFICATION IN LAKES Stratification—The study of layers Temperature Lakes often exhibit strong stratification of temperature due to density differences of water. Remember that temperature and salinity are the predominant factors that cause density differences in water. Thus, water that is 4 degree C will sink, and warmer (and colder) temperatures will rise. Salty water will sink. Key terms for lake stratification Epilimnion—upper layer Hypolimnion—lower layer Metalimnion—transition zone between the epilimnion and hypolimnion Thermocline—found within the metalimnion, this is the depth where temperature changes the most rapidly.
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bio155_Lecture_4_stratification_watermovements - BIOE 155,...

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