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Published byDorthy George Modified over 9 years ago
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Glacial Processes
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Snow metamorphosis Snow Firm Glacial Ice ~80 years in alpine glacier Denser
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Glaciers grow and their snout moves when accumulation is greater than ablation – animated GIF that should play for your computer (but don’t worry if it does not)
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Snowline – elevation above which snow persists year round
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Snowline
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Types of Glaciers: Ice Cap
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Greenland from space
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Small Ice Caps occur outside Greenland and Antarctica
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Types of Glaciers: Piedmont Piedmont Glacier
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Types of Glaciers: Alpine
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Larsen Ice Shelf Collapse calving (icebergs) Loss of glacial ice
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Ablation by melting
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How do glaciers move? One way: the flow internally (internal deformation) mm per day
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Another way is Regelation Slip (freeze-stick, melt flow) at the base of the glacier centimeters per day
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3rd: bed deformation (water & sediment act like ball bearings reducing friction) at the base of the glacier – resulting sudden surge Meters per day
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Movement can crack glaciers creating crevasses
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Crevasses can form by compression or extension
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The top crevasse separating snow from moving ice is the bergshrund
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Glaciers and Our Diet
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Position of snout (belly) reflects balance of accumulation and ablation
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Is this accumulation or ablation zone?
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Accumulation Zone Ablation Zone
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