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Temperature dependence of ice-on-rock friction at realistic glacier conditions

Christine McCarthy; Heather Moore Savage; Meredith K. Nettles

Title:
Temperature dependence of ice-on-rock friction at realistic glacier conditions
Author(s):
McCarthy, Christine
Savage, Heather Moore
Nettles, Meredith K.
Date:
Type:
Articles
Department(s):
Lamont-Doherty Earth Observatory
Volume:
375
Persistent URL:
Book/Journal Title:
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Abstract:
Using a new biaxial friction apparatus, we conducted experiments of ice-on-rock friction in order to better understand basal sliding of glaciers and ice streams. A series of velocity-stepping and slide–hold–slide tests were conducted to measure friction and healing at temperatures between −20°C and melting. Experimental conditions in this study are comparable to subglacial temperatures, sliding rates and effective pressures of Antarctic ice streams and other glaciers, with load-point velocities ranging from 0.5 to 100 µm s−1 and normal stress σn = 100 kPa. In this range of conditions, temperature dependences of both steady-state friction and frictional healing are considerable. The friction increases linearly with decreasing temperature (temperature weakening) from μ = 0.52 at −20°C to μ = 0.02 at melting. Frictional healing increases and velocity dependence shifts from velocity-strengthening to velocity-weakening behaviour with decreasing temperature. Our results indicate that the strength and stability of glaciers and ice streams may change considerably over the range of temperatures typically found at the ice–bed interface.
Subject(s):
Glaciology
Friction
Glaciers
Ice--Dynamics
Publisher DOI:
https://doi.org/10.1098/rsta.2015.0348
Item views
39
Metadata:
text | xml
Suggested Citation:
Christine McCarthy, Heather Moore Savage, Meredith K. Nettles, , Temperature dependence of ice-on-rock friction at realistic glacier conditions, Columbia University Academic Commons, .

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