Open

Coming up

Don't miss

Replay


LATEST SHOWS

MEDIAWATCH

Media accused of pro-protester bias in Ferguson

Read more

DEBATE

The Murderous Lure of Jihad: Tackiling ISIS and its Worldwide Recruitment (part 2)

Read more

DEBATE

The Murderous Lure of Jihad: Tackiling ISIS and its Worldwide Recruitment

Read more

FOCUS

Republicans block Obama's bid to hike minimum wage

Read more

WEB NEWS

Calls for ISIS media blackout after execution of James Foley

Read more

WEB NEWS

Web users divided over Darren Wilson

Read more

WEB NEWS

Web users take on 'Ice Bucket Challenge' to fight ALS

Read more

ENCORE!

From Paris's Liberation to 'arresting' art in Avignon

Read more

INSIDE THE AMERICAS

Ferguson riots: Pressure mounts on Obama

Read more

  • US says Islamic State threat 'beyond anything we've seen'

    Read more

  • Two US Ebola patients leave hospital ‘virus-free’

    Read more

  • Hollande is ‘nobody’s president’ says former French minister

    Read more

  • Turkey’s Erdogan names foreign minister Davutoglu as next PM

    Read more

  • US reaches historic $16.7bn settlement with Bank of America

    Read more

  • Special report: Supplying Ukraine’s soldiers on the front line

    Read more

  • US forces tried to rescue slain reporter from IS captors

    Read more

  • Israeli air strike kills three top Hamas commanders

    Read more

  • France delivered arms to Syrian rebels, Hollande confirms

    Read more

  • Tensions high in Yemen as Shiite rebel deadline looms

    Read more

  • Interactive: Relive the Liberation of Paris in WWII

    Read more

  • French village rallies behind besieged elderly British couple

    Read more

  • Former Irish PM Albert Reynolds dies at 81

    Read more

  • Former Femen activist detained after fighting veiled woman

    Read more

  • Thailand coup leader Prayuth Chan-ocha voted prime minister

    Read more

  • Brazil’s Silva launches bid after Campos plane crash death

    Read more

  • Brutal IS beheading video sparks social media pushback

    Read more

Big chunk of Antarctic ice falling apart

Latest update : 2008-03-26

Antarctica's massive Wilkins Ice Shelf has begun disintegrating under the effects of global warming with 414 square kilometers already gone, the University of Colorado has found.

Antarctica's massive Wilkins Ice Shelf has begun disintegrating under the effects of global warming, satellite images by the University of Colorado's National Snow and Ice Data Center showed.

The collapse of a substantial section of the shelf was triggered February 28 when an iceberg measuring 41 by 2.4 kilometers (25.5 by 1.5 miles) broke off its southwestern front.

That movement led to disintegration of the shelf's interior, of which 414 square kilometers (160 square miles) have already disappeared, scientists say.

The Wilkins Ice Shelf is a broad plate of permanent floating ice 1,609 kilometers (1,000 miles) south of South America, on the southwest Antarctic Peninsula.

Now, as a result of recent losses, a large part of the 12,950 square kilometer (5,000 square mile) shelf is supported by a narrow 5.6 kilometer (3.5 mile) strip of ice between two islands, scientists said.

"If there is a little bit more retreat, this last 'ice buttress' could collapse and we'd likely lose about half the total ice shelf area in the next few years," NSIDC lead scientist Ted Scambos said in a statement.

"Wilkins is the largest ice shelf on West Antarctica yet to be threatened. This shelf is hanging by a thread," echoed David Vaughan of the British Antarctic Survey, which contributed data on the break-up.

Over the past half century, the western Antarctic Peninsula has experienced the steepest temperature increase on Earth, 0.5 degrees Celsius (0.9 Farenheit) per decade.

"We believe the Wilkins has been in place for at least a few hundred years, but warm air and exposure to ocean waves are causing a breakup," said Scambos, who first spotted the disintegration in March.

With the Antarctic summer drawing to a close, scientists do not expect the ice shelf to further disintegrate in the next several months.

"This unusual show is over for this season," said Scambos. "But come January, we'll be watching to see if the Wilkins continues to fall apart."

Ice shelf breakup in the Antarctic -- more than 13,000 square kilometers (5,000 square miles) have been lost over the past 50 years -- could significantly increase ocean levels around the world.

In 1995 the Larsen A Ice Shelf -- 75 kilometers (47 miles) long and 35 kilometers (22 miles) wide -- disintegrated, fragmenting into icebergs in the Weddell Sea.

In March 2002, a NASA satellite captured the collapse of Larsen B, which had a surface area of 3,850 square kilometers (1,486 square miles), was 200 meters (656 feet) high, and packed in 720 billion tonnes of ice. It took just 30 days to break apart.

According to some calculations based on the present sea level rise of three milimeters per year (0.11 inches), ocean levels could rise by 1.4 meters (4.6 feet) by the end of the century.

Date created : 2008-03-26

COMMENT(S)