UNI101Y1 Chapter Notes - Chapter 4: Jet Stream, Hadley Cell, Lake Tanganyika
16 Feb 2013
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Therefore, lake doesn"t stratify in winter and there is only one mixing event per year (after summer stratification) Some tropical lakes with uniform temperature profile have deep vertical mixing caused by surface winds. Brings oxygen to depths and minerals to surface, supporting high overall productivity. In temperate zones, deep lakes are permanently stratified and are very unproductive. Global warming may create a thermocline in tropical lakes increase in surface temp. (increase temp. diff. btn surface and depths) impair vertical mixing, therefore reduce lake production ex. in lake tanganyika, east. Extreme conditions occur infrequently, but affect ecological systems disproportionately. Peru current consists of cold, nutrient-rich waters which provide abundance of fish. Flows north along west coast of south america and veers offshore at ecuador towards the west. North of this, warm, tropical inshore waters exist along the coast. Each year, a warm countercurrent, eell nnii oo, moves down the coast towards peru.
