EESB15H3 Lecture Notes - Lecture 16: Geomorphology, Laurentide Ice Sheet, Pleistocene
11 Dec 2017
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Eesb15 lecture 16 - glacial dynamics and geomorphology, predicting the future of ice. A glacier: is perennial ice that forms on land and moves under its own weight. Glaciers are made of thick deposits of snow and ice that form when annual melt is less than annual accumulation. Ablation: is the removal of snow and ice through melting or evaporation. Glaciers move under the influence of gravity. Move by a combination of basal slide and internal deformation. Velocity is controlled by thickness, slope, and bed conditions. Thin melt layer acts as a lubricant. Cold-based glaciers have a uniform temperature and move through the convection of heavier particles at the top of the glacier. Ice ages: are times in earth"s history where there is glacial ice frozen on both poles. Ice ages correspond to periods of colder mean temperatures on earth. Outside of ice ages, there are no continental ice sheets.
