Huge sub-glacial basin discovered under key Antarctic ice sheet could make it more unstable

 

A huge sub-glacial basin the size of Wales has been discovered under one of the key Antarctic ice sheets that could make it more unstable and liable to disintegration, a study has found.

Radar maps of the frozen Weddell Sea area of the West Antarctic Ice Sheet show that there is a deep sub-glacial basin measuring 100 km wide and 200 km long and up to 2 km deep on which the ice sheet appears to be floating.

Scientists fear that the area of the ice sheet that sticks out into the Weddell Sea, known as an ice "shelf", could melt away more quickly than previously supposed. This could cause the ice sheet itself to fall in to the sea, raising sea levels by several metres.

"We believe there's cause for concern....We believe this region is on the threshold of change," said Professor Martin Siegert of the University of Edinburgh, who led the project in conjuction with the British Antarctic Survey in Cambridge.

“This is a significant discovery in a region of Antarctica that at present we know little about. The area is on the brink of change, but it is impossible to predict what the impact of this change might be without further work enabling better understanding of how the West Antarctic Ice Sheet behaves,” Professor Siegert said.

The study, published in the journal Nature Geoscience, was designed to study the underlying landscape of the ice streams that feed the Filchner-Ronne Ice Shelf that acts as a kind of buffer for the ice sheet. The scientists found that there was a steep reverse slope with little in the way of "pinning points" that could delay the retreat of the ice sheet.

A separate study by a team of scientists from the Alfred Wegner Institute in Germany found that the ice shelf, which is currently melting at a rate of 5 metres a year, could be melting at up to 50 metres a year by the turn of the next century.

Jurgen Determann of the institute said: "Ice shelves are like corks in the bottles for the ice streams behind them. They reduce the ice flow because they lodge in bays everywhere and rest on islands. If, however, the ice shelves melt from below they become so thin the dragging surfaces become smaller and the ice behind them starts to move."

Start your day with The Independent, sign up for daily news emails
News
peoplePair enliven the Emirates bore-draw
Arts and Entertainment
tvPoldark episode 8, review
News
Britain's opposition Labour Party leader Ed Miliband (R) and Boris Johnson, mayor of London, talk on the Andrew Marr show in London April 26
General electionAndrew Marr forced to intervene as Boris and Miliband clash on TV
Arts and Entertainment
Ramsay Bolton in Game of Thrones
tvSeries 5, Episode 3 review
ebooks
ebooksA special investigation by Andy McSmith
  • Get to the point
Latest stories from i100
Have you tried new the Independent Digital Edition apps?
Independent Dating
and  

By clicking 'Search' you
are agreeing to our
Terms of Use.

iJobs Job Widget
iJobs General

Ashdown Group: Senior Accounts Assistant - Accounts Payable - St. Albans

£26000 - £28000 per annum + benefits : Ashdown Group: Senior Accounts Assistan...

Ashdown Group: Treasury Assistant - Accounts Assistant - London, Old Street

£24000 - £26000 per annum + benefits : Ashdown Group: A highly successful, glo...

Recruitment Genius: Installation and Service / Security Engineer

£22000 - £40000 per annum: Recruitment Genius: This company is part of a Group...

Recruitment Genius: Service Charge Accounts Assistant

£16000 - £18000 per annum: Recruitment Genius: Are you a a young, dynamic pers...

Day In a Page

Not even the 'putrid throat' could stop the Ross Poldark swoon-fest'

Not even the 'putrid throat' could stop the Ross Poldark swoon-fest'

How a costume drama became a Sunday night staple
Miliband promises no stamp duty for first-time buyers as he pushes Tories on housing

Miliband promises no stamp duty for first-time buyers

Labour leader pushes Tories on housing
Aviation history is littered with grand failures - from the the Bristol Brabazon to Concorde - but what went wrong with the SuperJumbo?

Aviation history is littered with grand failures

But what went wrong with the SuperJumbo?
Fear of Putin, Islamists and immigration is giving rise to a new generation of Soviet-style 'iron curtains' right across Europe

Fortress Europe?

Fear of Putin, Islamists and immigration is giving rise to a new generation of 'iron curtains'
Never mind what you're wearing, it's what you're reclining on

Never mind what you're wearing

It's what you're reclining on that matters
General Election 2015: Chuka Umunna on the benefits of immigration, humility – and his leader Ed Miliband

Chuka Umunna: A virus of racism runs through Ukip

The shadow business secretary on the benefits of immigration, humility – and his leader Ed Miliband
Yemen crisis: This exotic war will soon become Europe's problem

Yemen's exotic war will soon affect Europe

Terrorism and boatloads of desperate migrants will be the outcome of the Saudi air campaign, says Patrick Cockburn
Marginal Streets project aims to document voters in the run-up to the General Election

Marginal Streets project documents voters

Independent photographers Joseph Fox and Orlando Gili are uploading two portraits of constituents to their website for each day of the campaign
Game of Thrones: Visit the real-life kingdom of Westeros to see where violent history ends and telly tourism begins

The real-life kingdom of Westeros

Is there something a little uncomfortable about Game of Thrones shooting in Northern Ireland?
How to survive a social-media mauling, by the tough women of Twitter

How to survive a Twitter mauling

Mary Beard, Caroline Criado-Perez, Louise Mensch, Bunny La Roche and Courtney Barrasford reveal how to trounce the trolls
Gallipoli centenary: At dawn, the young remember the young who perished in one of the First World War's bloodiest battles

At dawn, the young remember the young

A century ago, soldiers of the Empire – many no more than boys – spilt on to Gallipoli’s beaches. On this 100th Anzac Day, there are personal, poetic tributes to their sacrifice
Dissent is slowly building against the billions spent on presidential campaigns – even among politicians themselves

Follow the money as never before

Dissent is slowly building against the billions spent on presidential campaigns – even among politicians themselves, reports Rupert Cornwell
Samuel West interview: The actor and director on austerity, unionisation, and not mentioning his famous parents

Samuel West interview

The actor and director on austerity, unionisation, and not mentioning his famous parents
General Election 2015: Imagine if the leading political parties were fashion labels

Imagine if the leading political parties were fashion labels

Fashion editor, Alexander Fury, on what the leaders' appearances tell us about them
Phumzile Mlambo-Ngcuka: Home can be the unsafest place for women

Phumzile Mlambo-Ngcuka: Home can be the unsafest place for women

The architect of the HeForShe movement and head of UN Women on the world's failure to combat domestic violence