Topic 14_colour

Topic 14_colour - Topic14 1. Formation of Glacial Ice Material Snow Firn Glacial Ice Snow low density(air Glacial ice dense(minimal air Average

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Geography 211 (Fall 2009) 11/22/09 1 Topic 14 Glacial Processes and Landforms 1. Glacier Ice and Glacier Types Formation of Glacial Ice Material Average Density Snow 50-400 kg/m 3 Firn 400-830 kg/m 3 Glacial Ice > 830 kg/m 3 Snow: low density (air) Glacial ice: dense (minimal air) Glaciers unconstrained by topography Ice sheet: • large mass of ice that buries land Ice cap: < 50 000 km 2 2. Types of Glaciers
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Geography 211 (Fall 2009) 11/22/09 2 Glaciers constrained by topography Cirque glacier Valley glacier Ice field • complex of mountain glaciers burying much of mountain range • peaks often visible Piedmont glacier • base of mountains and spread over lowlands Accumulation: snowfall freezing of water seasonality of precipitation important Ablation: melting sublimation calving wind erosion Accumulation zone: accumulation > ablation Ablation zone: ablation>accumulation Equilibrium line: accumulation = ablation Annual mass balance (b n ): annual accumulation – annual ablation 3. Mass Balance hDp://www.nichols.edu/departments/glacier/mb.htm
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Geography 211 (Fall 2009) 11/22/09 3 Drainage Systems Supraglacial Englacial Subglacial Supraglacial channel Subglacial channel Active ice:
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This note was uploaded on 02/04/2010 for the course GEOG 331 taught by Professor Staff during the Fall '08 term at Kansas.

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Topic 14_colour - Topic14 1. Formation of Glacial Ice Material Snow Firn Glacial Ice Snow low density(air Glacial ice dense(minimal air Average

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