Scientists observe drumlin beneath ice sheet

Jan 23, 2007

Scientists have discovered a warehouse-sized drumlin – a mound of sediment and rock – actively forming and growing under the ice sheet in Antarctica. Its discovery, and the rate at which it was formed, sheds new light on ice-sheet behaviour. This could have implications for predicting how ice sheets contribute to sea-level rise. The results are published this week in the journal Geology.

Drumlins are well known features of landscape scoured by past ice sheets and can be seen in Scotland and Northern England where they were formed during the last ice age. They form underneath the ice as it scrapes up soil and rock, and they slow down the rate at which the ice can flow.

Scientists from British Antarctic Survey (BAS), Swansea University and NASA's Jet Propulsion Laboratory Pasadena used a new technique of time-lapse seismic surveys to find the drumlin, and how it formed over time.

Lead author Dr Andy Smith of BAS says, "This is the first time anyone has observed a drumlin actually forming under the ice. These results will help us interpret the way ice sheets behaved in the past, and crucially, will help predict how they might change in the future".

To the team's surprise the drumlin grew ten times faster than they had ever expected, giving a new and important insight into the drag on the underside of the ice and hence how fast ice sheets are able to flow. The study took place on the Rutford Ice Stream – a 2-km thick, fast flowing ice stream draining part of the West Antarctic ice sheet.

The team used seismic reflection data gathered three times over the last 13 years to map the changes beneath the ice.

Second author Professor Tavi Murray of Swansea University's School of the Environment and Society says, "The new study was recently described at a conference as 'hunting drumlins in the wild'. The analogy with wildlife is good. We learn a lot more from seeing an animal born and growing up, than just dissecting an ancient body. The same is true of drumlins. By observing the birth and growth of this drumlin, we can see that the landscape beneath an ice sheet is changing at a rate faster than previously thought".

Source: British Antarctic Survey

Explore further: Satellite witnesses developing US nor'easter

add to favorites email to friend print save as pdf

Related Stories

Microsoft profit dips as revenue rises

4 hours ago

Microsoft on Monday reported that its quarterly profit dipped as revenue increased with help from sales of Surface tablets, Xbox One consoles and cloud services.

Black hole chokes on a swallowed star

5 hours ago

A five-year analysis of an event captured by a tiny telescope at McDonald Observatory and followed up by telescopes on the ground and in space has led astronomers to believe they witnessed a giant black hole ...

Montana oil spill estimate lowered to 30,000 gallons

5 hours ago

Authorities have lowered their estimate of how much oil spilled from a broken pipeline beneath the Yellowstone River in eastern Montana, briefly contaminating the water supply of a city downstream.

Recommended for you

Study finds how weathermen get their forecasts wrong

11 hours ago

The night before the Israel Defense Forces' 1976 mission rescuing over 200 hostages from hijackers in Entebbe, Uganda, Tel Aviv University's Prof. Pinhas Alpert, then head of an Israel Air Force base forecasting ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.