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Related Experiment Video

Updated: May 16, 2026

Simulating Impacts of Ice Storms on Forest Ecosystems

Simulating Impacts of Ice Storms on Forest Ecosystems

Published on: June 30, 2020

Frequency response of ice streams.

C Rosie Williams¹, Richard C A Hindmarsh, Robert J Arthern

¹British Antarctic Survey , High Cross, Madingley Road, Cambridge CB3 0ET, UK.

Proceedings. Mathematical, Physical, and Engineering Sciences

|December 1, 2012

Summary

This summary is machine-generated.

Ice stream grounding line changes propagate inland through distinct mechanisms. Low frequencies transmit changes via flow and geometry, while high frequencies use direct stress transmission, impacting sea level.

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Area of Science:

Glaciology
Ice stream dynamics
Sea level rise

Background:

Grounding line changes in ice streams significantly impact inland ice and global sea levels.
The mechanisms driving upstream propagation of these frontal changes remain poorly understood.
Understanding these mechanisms is crucial for accurate sea level rise predictions.

Purpose of the Study:

To investigate the frequency-dependent mechanisms of upstream propagation of changes in ice streams.
To analyze how basal and lateral resistance influence the transmission of these changes.
To model the response of ice streams to periodic forcing and sudden ice-shelf changes.

Main Methods:

Utilized a one-dimensional, linearized membrane stress approximation for an idealized ice stream.
Examined the frequency response to periodic forcing in the downstream strain rate.
Simulated sudden ice-shelf changes using a square-wave function by summing frequency solutions.

Main Results:

Identified two distinct behavioral branches based on forcing frequency.
Low frequencies (centennial-millennial) show covariance of slope and thickness propagating hundreds of kilometers, explained by shallow-ice approximation.
High frequencies (decadal) exhibit rapid velocity adjustment with minimal thickness change, propagating tens of kilometers via direct membrane stress transmission.

Conclusions:

Upstream propagation mechanisms differ significantly with forcing frequency, influencing ice stream behavior.
Propagation properties exhibit considerable variation across Antarctic ice streams.
The study provides insights into the dynamical response of ice streams to ice-shelf changes, crucial for sea level projections.