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A ring shear device to simulate cryosphere processes.

L K Zoet¹, P Sobol¹, N Lord¹

¹Department of Geoscience, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.

The Review of Scientific Instruments

|December 11, 2023

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Researchers created a new device to study glacier slip physics. This innovation improves understanding of cryosphere processes and sea-level rise predictions.

Area of Science:

Glaciology
Cryosphere Science
Earth System Science

Background:

Glacier slip is a key factor in ice flow dynamics.
Understanding subglacial processes is crucial for accurate sea-level rise projections.
Current models often lack detailed insights into glacier basal mechanics.

Purpose of the Study:

To introduce a novel cryogenic ring shear device for simulating glacier slip.
To investigate the physical processes governing glacier movement under controlled conditions.
To enhance the predictive capability of glacier contributions to sea-level rise.

Main Methods:

A cryogenic ring shear device was developed to spin an ice ring (20–60 cm diameter) at the pressure melting point.
Simulated overburden pressures (5–915 kPa) and velocities (0.01–1000 m a-1) were applied to the ice sample.

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Transparent walls allowed direct observation of subglacial processes, with experiments conducted in a walk-in freezer over weeks to months.

Main Results:

The device successfully replicates in situ cryosphere conditions for studying glacier slip.
It allows for precise control over experimental parameters, including pressure, velocity, and heat flux.
Direct observation of subglacial processes provides new data on ice-bed interactions.

Conclusions:

The new cryogenic ring shear device offers a powerful tool for advancing glaciological research.
It enables detailed study of unconstrained physical processes regulating glacier movement.
Improved understanding of glacier slip will lead to more accurate sea-level rise predictions.