Lakes_I_-_Lect13_S10

Lakes_I_-_Lect13_S10 - Lakes I The Physics of Lakes...

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1 Lakes I: The Physics of Lakes Advanced Environmental Geochemistry Lecture 13 Spring 2010
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2 Replacement Time for Water
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Full Circulation 3
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Lake Nyos, Cameroon 4 Lake Nyos after the overturn event Eyewitnesses said the reddish bron color appeared right after the overturn event
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Summer Stratification 5
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6 Development of a Thermocline Figure a, no wind and no mixing Figure b, strong wind with strong mixing
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Summer Hypoxia 7
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Autumn Cooling 8
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Autumn Overturn 9
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Winter Stagnation 10
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Forel Classification Temperate lakes - Regular alternation of periods of stagnation accompanied by direct or inverse stratification with intervening periods of total circulation (isothermal conditions) Tropical lakes - Continuous direct stratification Polar lakes - Inverse stratification. (May show periods of total circulation) 11
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12 Hutchinson and Löffler Classification of Lakes Based on the number of periods of total circulation per year Avoids the sometimes unfortunate
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