Please enable JavaScript.
Coggle requires JavaScript to display documents.
Ice Sheet Flow 2 (Ice Sheet Drawdown (1. Thick ice sheet insulates ∴ …
Ice Sheet Flow 2
Ice Sheet Drawdown
1. Thick ice sheet insulates
∴ bottom melts due to geothermal heat
2. Meltwater lubricates bed -->
ice flows into ocean
3. Ice thins (to maintain mass continuity)
∴ Insulation stops & bed refreezes
Result: ice sheet drawdown = significant
Large scale
flow character
= how flow velocity eqn dictates ice sheet shape & flow character
Margin = faster ice flow
Interior = slower / little ice flow
Ice Sheet
Shape
Accumulation = greatest upstream
Little accumulation upstream as interior = nr ice divide
∴ stagnation as little flux
∴ Significant transport from interior to margin
= required to balance mass
Margins =
Lower accumulation
∴ Thinner ice
Must flow faster to discharge ice from upstream (balance mass)
∴ surface slope steepens near margin
Great influx from interior
Antarctic
Interior
High accumulation
Lotsa snow
No melt
Steady State
Ice Sheet
Mass flux @ margin
must balance
accumulation in interior