Glaciology Practical

what is an ice stream?
an ice stream is a glacier that moves faster than the ice around it.
what are ice streams a control of?
ice steams help control drainage
difference between an ice shelf and an ice sheet
and ice shelf floats over water
3 sinks of ice for the ice sheet mass balance:

3 sinks of ice for the ice sheet mass balance: 

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1. iceberg calving

2. surface ablation

3. melting of ice at base 

snow > ice metamorphism is controlled by what?
snow > ice metamorphism is controlled by temperature and pressure, which are a function of depth and surface climate
snow accumulation pattern across AN continent
the most snow falls at the coast, the least at the center
why do we care about AN ice mass balance?
we care about AN ice mass balance because it tells us the rate that AN ice is decreasing
age of AN ice is a function of _____ and ____
age of AN ice is a function of depth and accumulation
ice movement in AN occurs via these three mechanisms

ice movement in AN occurs via 

1. ice deformation > creep

2. basal sliding

3. subglacial sediment deformation 

biggest contributor of ice movement in AN
biggest contributor of ice movement in AN is deformation/creep
main difference between EAIS and WAIS

EAIS is stable

WAIS is a marine ice sheet and potentially unstable. ice shelves are most vulnerable 

how does basal water affect ice movement?
ice can move much faster if it can slides along water at it’s base
annual layers of ice vary in ___ and ___
annual layers of ice vary in morphology and chemistry