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Siple Coast Ice Streams (Dating Kamb Shutdown (Radargram Findings:…

- - - - Increased sliding - more friction & heating = POSITIVE FEEDBACK
      - Ice motion generates basal stress
        --> frictional heating --> water --> increased sliding
  - - - Surface drawdown forms depressions
        ∴ sourcing more water from adjacent streams
      - Widen - overcome lateral stresses
    - - sufficient separation so don't disturb eachother's flow / hydrology
    - - not fast enough to self sustain via basal melt
      - slowdown as too narrow ∴ lateral stresses dominate
- - - - Ice accumulating from snowfall
      - Interannual layers
    - - ∴ Disturbed layers evince ice stream
      - Ice streams deform/crevasse radar layers
- - - - Velocity = v. sensitive to ice stream width
      - Basal heat generated = f(basal stress & velocity)
    - - Reduces velocities
      - Reduces meltwater @ bed
      - Shifts heat balance @ bed to negative