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Radar derived basal conditions at the onset of the Northeast Greenland Ice Stream.

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Steven Franke, Daniela Jansen, Sebastian Beyer, Tobias Binder, John Paden, and Olaf Eisen

Radar derived basal conditions at the onset of the Northeast

Greenland Ice Stream.

(2)

Steven Franke, Daniela Jansen, Sebastian Beyer, Tobias Binder, John Paden, and Olaf Eisen

Radar derived basal conditions at the onset of the Northeast

Greenland Ice Stream.

(3)
(4)
(5)
(6)

• Upstream: smooth bed → acceleration

• Downstream: rough bed → decrease of acceleration/velocity

• Constant increase in mass flux compensated:

• Upstream by acceleration

• Downstream by widening

• Where bed is smooth:

• High abruptness anisotropy → streamlining → probably

deformable bed

• Where bed is rough:

• Increasing layer thickness → higher basal shear stress

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