Term
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Definition
| an ice stream is a glacier that moves faster than the ice around it. |
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Term
| what are ice streams a control of? |
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Definition
| ice steams help control drainage |
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Term
| difference between an ice shelf and an ice sheet |
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Definition
| and ice shelf floats over water |
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Term
| 3 sinks of ice for the ice sheet mass balance: |
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Definition
3 sinks of ice for the ice sheet mass balance:
1. iceberg calving
2. surface ablation
3. melting of ice at base |
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Term
| snow → ice metamorphism is controlled by what? |
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Definition
| snow → ice metamorphism is controlled by temperature and pressure, which are a function of depth and surface climate |
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Term
| snow accumulation pattern across AN continent |
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Definition
| the most snow falls at the coast, the least at the center |
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Term
| why do we care about AN ice mass balance? |
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Definition
| we care about AN ice mass balance because it tells us the rate that AN ice is decreasing |
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Term
| age of AN ice is a function of _____ and ____ |
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Definition
| age of AN ice is a function of depth and accumulation |
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Term
| ice movement in AN occurs via these three mechanisms |
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Definition
ice movement in AN occurs via
1. ice deformation → creep
2. basal sliding
3. subglacial sediment deformation |
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Term
| biggest contributor of ice movement in AN |
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Definition
| biggest contributor of ice movement in AN is deformation/creep |
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Term
| main difference between EAIS and WAIS |
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Definition
EAIS is stable
WAIS is a marine ice sheet and potentially unstable. ice shelves are most vulnerable |
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Term
| how does basal water affect ice movement? |
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Definition
| ice can move much faster if it can slides along water at it's base |
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Term
| annual layers of ice vary in ___ and ___ |
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Definition
| annual layers of ice vary in morphology and chemistry |
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