Glacial Processes. Snow metamorphosis Snow Firm Glacial Ice ~80 years in alpine glacier Denser.
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Transcript of Glacial Processes. Snow metamorphosis Snow Firm Glacial Ice ~80 years in alpine glacier Denser.
![Page 1: Glacial Processes. Snow metamorphosis Snow Firm Glacial Ice ~80 years in alpine glacier Denser.](https://reader035.fdocuments.us/reader035/viewer/2022062217/5697c0071a28abf838cc6307/html5/thumbnails/1.jpg)
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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AccumulationZone
Ablation Zone
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