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Ice Shelves (What ? (= part of ice sheet afloat in ocean (floating…
Ice Shelves
What ?
= part of ice sheet afloat in ocean
floating extension of ice sheet
forms at marin margins
where ice no longer thick enough to maintain contact with bed
Flow
Pine Island ice shelf ~3-4 km/yr (fastest in world
Ross Ice Shelf ~500-1000 m / yr
Flow faster than ice streams
Antarctic Thinning Rates
Lots happening @ margins
Siple Coast
Ice Streams - blue
Blue rise SW Antarctica (south of mtns)
Thickening signal (where stagnation?)
West Coast - red
Fastest thinning rates in Antarctica/world
Antarctica
IS Bed
∴ Ice sheet bed = well below sea level
WAIS / much of Antarctic IS = 'marine ice sheet'
'Foredeepened bed'
deeper inland than at margin
Myr of ice pressing down on bed
Grounding Line
= where ice sheet disconnected from bed
∴ ice becomes afloat
i.e. transition ice sheet/stream to shelf
WAIS Unstable
due to:
Downsloping bed
Ocean interaction
Antarctic
Ice Shelves
= largest ice shelves in world
i.e. Ross & Ronne-Filchner