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Lecture 7

GLY 1103 Lecture 7: Glaciers and Climate Change notes

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GLY 1103
Brian Zimmer

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Thursday, November 12, 2015 Glaciers and Climate Change Its getting HOT in here Seasonal cooling and warming based on axial tilt (Northern hemisphere toward sun = summer) (N hemisphere away from sun = winter) not based on distance from the sun at poles = permenant ice all over at Equator = 8 km up GLACIERS Forming a glacier three conditions are necessary to form a glacier cold local temp (polar or high elevations) snow must be abundant (more falls than melts) snow must not be removed by avalanches or winds loose on top, packedthigh ice on bottom (course ice) Types of glaciers glaciers are found @ high latitudes = continental glaciers glaciers @ high elevations = alpine glaciers Thermal categories used to classify glaciers determined by climate temperate at or above melting temp polar well below melting temp How do glaciers move? wetbottom glacier water ows along base of glacier basal sliding iceslippingmelt water drybottom glacier cold base is frozen to substrate 1
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