General microphysical control on icesheet character

Thus emboldened, I use the formalism of section 57.2 to resume the more general exploration (sections 57.2.2.1 and 57.2.3.1) of how the microphysically determined ice properties (effective viscosity, stress exponent, activation energy and enhancement) control ice-sheet characteristics. The accumulation rate patterns, spans and grounding-line thicknesses of the three representative profiles define Greenlandic-type, East Antarctic-type, and West Antarctic-type ice-sheet profiles, conceptual constructs used here for subsequent calculations.

To compare different forms of power-law creep, e = A(n)tn, it is necessary to define an effective viscosity h. Here I do this by using h = A-/), equating the ice flux in a linear-viscous flow to the ice flux in a flow with stress exponent n (given the same basal stress), and then substituting for tb using Q, H and A(n). This gives

Antarctic Ice Sheet Diagram

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Antarctic Ice Sheet Diagram

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