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."

VIDEO
News
weird news... and film it, obviously
Arts & Entertainment
tv
News
Matthew Mcnulty and Jessica Brown Findlay in 'Jamaica Inn'
mediaHundreds complain over dialogue levels in period drama
News
peopleJay Z and Beyoncé to buy £5.5m London townhouse
Voices
voicesMoyes' tragedy is one the Deputy PM understands all too well, says Matthew Norman
Arts & Entertainment
Rocker of ages: Chuck Berry
musicWhy do musicians play into old age?
Arts & Entertainment
With Jo Joyner in 'Trying Again'
tvHe talks to Alice Jones on swapping politics for pillow talk
News
Jilly's jewels: gardener Alan Titchmarsh
peopleCountry Life magazine's list of 'gallant' public figures throws light on what it means to be a gentleman in the modern world
Sport
John Terry goes down injured in the 70th minute
sportAtletico Madrid 0 Chelsea 0: Blues can finish the job at Stamford Bridge, but injuries to Terry and Cech are a concern for Mourinho
Student
student
News
<b>Rebecca Adlington</b>
<br />This, the first British swimmer to win two
Olympic gold medals in 100 years, is the eversmiling
face of the athletes who will, we're
confident, make us all proud at London 2012
peopleRebecca Adlington on 'nose surgery'
Independent
Travel Shop
the manor
Up to 70% off luxury travel
on city breaks Find out more
santorini
Up to 70% off luxury travel
on chic beach resorts Find out more
sardina foodie
Up to 70% off luxury travel
on country retreats Find out more
Have you tried new the Independent Digital Edition iPad app?
Independent Dating
and  

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

iJobs Job Widget
iJobs General

Clinical Negligence

Very Competitive: Austen Lloyd: Clinical Negligence - Oxford An opportunity f...

Projects Financial Analyst - Global Technology firm

£55000 - £62000 per annum + outstanding benefits and bonus: Pro-Recruitment Gr...

Reception Teacher

£120 per day: Randstad Education Luton: Reception teacher required for an Outs...

Commercial B2B Pricing Specialist - Global Bids and Tenders

£35000 - £45000 per annum + excellent company benefits : Pro-Recruitment Group...

Day In a Page

Brits who migrate to Costa del Sol more unhappy than those who stay at home

It's not always fun in the sun: Moving abroad does not guarantee happiness

Brits who migrate to Costa del Sol more unhappy than those who stay at home
Migrants in Britain a decade on: They came, they worked, they stayed in Lincolnshire

Migrants in Britain a decade on

They came, they worked, they stayed in Lincolnshire
Chris Addison on swapping politics for pillow talk

Chris Addison on swapping politics for pillow talk

The 'Thick of It' favourite thinks the romcom is an 'awful genre'. So why is he happy with a starring role in Sky Living's new Lake District-set series 'Trying Again'?
Why musicians play into their old age

Why musicians play into their old age

Nick Hasted looks at how they are driven by a burning desire to keep on entertaining fans despite risking ridicule
How can you tell a gentleman?

How can you tell a gentleman?

A list of public figures with gallant attributes by Country Life magazine throws a fascinating light on what it means to be a gentleman in the modern world
Pet a porter: posh pet pampering

Pet a porter: posh pet pampering

The duo behind Asos and Achica have launched a new venture offering haute couture to help make furry companions fashionable
A History of the First World War in 100 moments: The mutiny that sent a ripple of fear through the Empire

A History of the First World War in 100 moments

The mutiny that sent a ripple of fear through the Empire
Hot stuff: 10 best kettles

Hot stuff: 10 best kettles

Celebrate St George’s Day with a nice cup of tea. Now you just need to get the water boiled
Sam Wallace: Why Giggs is perfect fit as Manchester United boss... in the longer term

Sam Wallace

Why Ryan Giggs is perfect fit as Manchester United boss... in the longer term
Renaud Lavillenie: The sky's the limit for this pole vaulter's ambitions

Renaud Lavillenie: The sky's the limit for this pole vaulter's ambitions

Having smashed Sergei Bubka's 21-year-old record, the French phenomenon tells Simon Turnbull he can go higher
Through the screen: British Pathé opens its archives

Through the screen

British Pathé opens its archives
The man behind the papier mâché mask

Frank Sidebottom

The man behind the papier mâché mask
Chris Marker: Mystic film-maker with a Midas touch

Mystic film-maker with a Midas touch

Chris Marker retrospective is a revelation
Boston runs again: Thousands take to the streets for marathon as city honours dead and injured of last year's bombing

Boston runs again

Thousands of runners take to the streets as city honours dead of last year
40 years of fostering and still holding the babies (and with no plans to retire)

40 years of fostering and holding the babies

In their seventies and still working as specialist foster parents