Sunday, 22 July, 2018

Ocean waves in Antarctica can trigger ice shelf collapse

Antarctica holds enough frozen water to raise the global sea level by 58 metres CRAIG PLATT Antarctica holds enough frozen water to raise the global sea level by 58 metres
Doris Mccormick | 16 June, 2018, 11:03

The latest figures show East Antarctica is losing relatively little ice a year - about 31 tons - since 2012.

The new findings are the result of the most complete satellite survey of Antarctic ice sheet change to date, involving 84 scientists from 44 worldwide organizations (including NASA and the European Space Agency). This has led to an increase in sea levels of roughly three-tenths of an inch, which doesn't seem like much.

The annual sea level rise that's attributed to Antarctica has tripled, from 0.2mm to 0.6mm, or from less than a tenth of an inch to almost a quarter of an inch, he says. The researchers also discovered that whilst the entire region of sea ice encompassing Antarctica has been portrayed scanty comprehensive adjustment since the emergence of satellite observations, mid-20th century ship-based observations propose a lifelong fall.

On current trends, Antarctica could become the single largest source of sea level rise, ahead of runoff from the Greenland ice sheet and mountain glaciers, and the expansion of ocean water as it warms, the study found.

"To see a threefold increase just since 2012 - that's disturbing to me", said Brenda Ekwurzel, director of climate science for the Climate and Energy Program at the Union of Concerned Scientists.

At the northern tip of the continent, ice-shelf collapse at the Antarctic Peninsula has driven an increase of 27.6 billion tons (25 billion metric tons) in ice loss per year since the early 2000s.

The continent is now melting so fast, scientists say, that it will contribute 6 inches (15 centimetres) to sea-level rise by 2100.

"But where there is loss of sea ice, storm-generated ocean swells can easily reach the exposed ice shelf, causing the first few kilometres of its outer margin to flex". Scientists can also detect markers of where ice sheets once covered Antarctica by looking at the seabed around the western part of the continent, which holds traces of where glaciers were pinned in the past, Shepherd explained.

"The next piece of the puzzle is to understand the processes driving this change", Durham University's Pippa Whitehouse said.

North Korea's dispersed and hidden weapons complex highlights the challenge of denuclearization
The North Koreans want to keep some nuclear weapons as a deterrent against a US -backed attempt at regime change. Trump, in his turn, reiterated his readiness to provide security guarantees to North Korea.


Netflix extends agreement to stream Anthony Bourdain's 'Parts Unknown'
His brilliant, fearless spirit touched and inspired so many, and his generosity knew no bounds", she said in the statement Friday. He was discovered unresponsive in his hotel room by his friend Eric Ripert , who was with him during filming the show.


Hillary Clinton trolls James Comey with savage 3-word tweet
It doesn't mean that the Mueller investigation will come up with nothing, or that Trump has been exonerated. But he quickly added, "It's also important to note what the Inspector General did not find".


In 2017, that number had risen to 0.6mm per year.

Shepherd told Newsweek that there is a combination of factors that have led to the increased rate of ice loss in recent years, all of which are indicators of climate change.

In 2015, a NASA study warned that Antarctica's Larsen B ice shelf was likely to shatter into hundreds of icebergs before the end of the decade.

West Antarctica experienced the largest change, with ice losses growing from 53 billion tons per year in the 1990s to 159 billion tons annually since 2012.

Professor Martin Siegert, from the Grantham Institute at Imperial College, said: "Some of the changes Antarctica will face are already irreversible, such as the loss of some ice shelves, but there is a lot we can prevent or reverse". The research involved more than 80 scientists from 44 global organizations and used data taken from multiple satellites, as well as air and ground measurements and computer simulations.

Scientists have long known that the effects of global warming are amplified in Antarctica, causing changes that can be felt around the world.

Last year, a project carried out by British-based researchers revealed 91 volcanoes beneath the surface in the west of Antarctica, meaning there are now at least 138 underwater craters in the region.

There have been many other estimates of how much ice has melted in Antarctica. "They show no indication of being exposed to cosmic rays", said Marc Caffee, a co-author of the paper and professor of physics and atronomy at Purdue University. Thanks to the satellites that our space agencies have launched, we can now track their ice losses and global sea-level contribution with confidence. The bedrock under the landbound ice slopes downward, which is in turn allowing those warm waters to march ever further inland.

Recommended

  • Four-door fury: Meet the 444 kW Aston Martin Rapide AMR

    Four-door fury: Meet the 444 kW Aston Martin Rapide AMR

    The Silhouette scheme eschews the Lime accents and instead adds a full-length contrasting stripe in China Grey or Clubsport White. It also utilises the cooling system on the Vanquish S , with modified brake ducts and dust shields.
    Trump planning 25% tariffs on up to $50 billion of Chinese goods

    Trump planning 25% tariffs on up to $50 billion of Chinese goods

    The US president said the new tariffs were created to punish China for the theft of American intellectual property and technology. A statement from the Chinese Ministry of Commerce said that the country would implement tariffs on a similar scale on U.S. goods.
    No boots, no problem as Queiroz plays up Iran unity

    No boots, no problem as Queiroz plays up Iran unity

    Portugal have since won Euro 2016 and are hoping Cristiano Ronaldo, 33, can turn it on in what's likely to be his last World Cup. But Iran took the victory, only their second in World Cup history after a 2-1 win over the United States at France 1998.
  • 120 countries at United Nations  condemn Israel over Gaza violence

    120 countries at United Nations condemn Israel over Gaza violence

    In a statement today (Thursday), he said that the resolution was "a victory for Palestinian rights, justice and global law". Unlike the Security Council, resolutions adopted by the assembly are non-binding and there is no veto.
    Ronaldo to get jail time?

    Ronaldo to get jail time?

    Since finding the net at Euro 2004, he has gone on to grab goals at three further European Championships and four successive World Cups .
    Idaho boy diagnosed with plague

    Idaho boy diagnosed with plague

    The department added that the child might have contracted the disease during a trip to OR , but it wasn't yet confirmed. In most cases, there is a painful swelling of the lymph node in the groin, armpit or neck areas.
  • Republican Trump critic ousted in closely-watched primary

    Republican Trump critic ousted in closely-watched primary

    Earlier this year at the party convention, journalist Leslie Cockburn won the nomination in Virginia's 5th Congressional District. Heidi Heitkamp of North Dakota . "It was a very close election". "We've seen this in earlier races in earlier primaries".
    'Antsy and bored' Trump almost  left Kim summit in peril, report says

    'Antsy and bored' Trump almost left Kim summit in peril, report says

    We are afraid to sing, say, wear, or think what we want. "He was insane , a real nut job", Trump said , according to the Times. Donald Trump made the surprise announcement following his summit with North Korean leader Kim Jong-un.
    Volvo S60 first with Polestar Engineered performance upgrade

    Volvo S60 first with Polestar Engineered performance upgrade

    Volvo is going electric, but that doesn't mean the Swedish automaker is slowing down when it comes to making its lineup speedier. Volvo has released details of its upcoming S60 Polestar Engineered range topper ahead of its debut next week.
  • Gary Neville confident of England win against Tunisia in WC opener

    Gary Neville confident of England win against Tunisia in WC opener

    Media had access to the first 15 minutes of training and saw the players warm up for the main part of the session. Southgate, though, has no intentions of letting anyone in and around the camp getting ahead of themselves.
    OnePlus 6 Sales Reached 1 Million Units Within 22 Days of Launch

    OnePlus 6 Sales Reached 1 Million Units Within 22 Days of Launch

    OnePlus are a fledgling company focused on packing as much value into a phone with the highest specs possible for a decent price. All of that attention and build-up worked out, because it sounds like the OnePlus 6 has been a home run for the company.
    Black Manta's Suit Revealed in Aquaman First Look Photo

    Black Manta's Suit Revealed in Aquaman First Look Photo

    Aquaman hits theaters in December and will be the only DCEU movie to be released in 2018 and the first since Justice League . On the cover, Nicole's character can be seen alongside Jason Momoa as Aquaman and Amber Heard as Mera .

'I certainly wouldn't sign' House GOP immigration compromise 'I certainly wouldn't sign' House GOP immigration compromise President Donald Trump says he won't sign a "moderate" immigration bill written by House Republicans. President Trump speaks to reporters on the North Lawn of the White House on Friday.

Trump hits out at OPEC, accuses it of rising oil prices Trump hits out at OPEC, accuses it of rising oil prices But infrastructure and logistics could constrain growth and the IEA only sees supply growth of 1.7 million bpd in 2019. That is a 580,000 b/d year-on-year drop and a 910,000 b/d fall in two years, according to survey data.

Kansas sheriff’s deputy dead, 1 in critical condition after shooting near courthouse Kansas sheriff’s deputy dead, 1 in critical condition after shooting near courthouse Jeff Colyer offered a moment of silence for the deputies after he finished a speech in the city, the paper said. Kansas City, Kansas, police confirm the deputies were shot at the courthouse in downtown Kansas City, Kansas.

Opportunity rover goes dark during Mars dust storm Opportunity rover goes dark during Mars dust storm That's survivable for the rover, which was created to tolerate temperatures as low as minus 67 degrees F (minus 55 degrees C). Opportunity has seen a lot in its time on Mars - including another powerful dust storm, which the rover weathered in 2007 .

Sanders Pushes Back Against Report She's Leaving The White House Sanders Pushes Back Against Report She's Leaving The White House Wolf was widely criticized for her speech at the dinner, which took aim at the Trump administration, and in particular, Sanders. Trump made the comments live on "Fox & Friends" during an impromptu interview on the White House lawn.

Apple signs Oprah Winfrey to multiyear programme deal Apple signs Oprah Winfrey to multiyear programme deal Her Harpo Films banner has produced several acclaimed features, most recently Selma , in which she also had a featured role. Apple says it has reached a multi-year deal with Winfrey to create original programs for its streaming service.

American Airlines glitch strands thousands of flyers American Airlines glitch strands thousands of flyers American Airlines flights set for Friday are continuing on as scheduled, officials said, CBS-affiliated WSPA reported. Passengers traveling to and from the Charlotte airport were advised to check with their carriers.

Microsoft plans to launch Surface Pro 6, foldable device this year Microsoft plans to launch Surface Pro 6, foldable device this year It is expected that Microsoft will also introduce lower-priced Surface tablets which are likely to compete with the Apple iPads. I wouldn't expect this to replace the official Surface charger, but it should give you a little bit of extra power in a pinch.

Donald Trump Wants "His People" To Treat Him Like Kim Jung Donald Trump Wants He went on to say that when Kim speaks, "his people sit up at attention". Yeah, I think it is something that could happen.

Theranos founder Elizabeth Holmes steps down as CEO Theranos founder Elizabeth Holmes steps down as CEO Theranos claimed its product could test a small drop of blood for a number of diseases, but it was never able to back that up. Theranos initially came under fire in 2015 over the accuracy of its blood tests.

White House Hits China With New Tariffs, Ramping up Trade War White House Hits China With New Tariffs, Ramping up Trade War By June 30, the administration is expected to finish writing rules to restrict China's ability to invest in USA technology. The president has coordinated closely with China on efforts to pressure Pyongyang to eliminate its nuclear arsenal.

Michael Cohen Requests Court Order Forcing Stormy Daniels' Attorney to Shut Up Michael Cohen Requests Court Order Forcing Stormy Daniels' Attorney to Shut Up Those reports went into overdrive this week thanks to reports that Cohen is splitting with his legal team . Cohen must be stopped in its tracks". "The motion for a gag order is a complete joke and baseless".

Kyrie Irving’s Comments on Possibly Reuniting With LeBron James Kyrie Irving’s Comments on Possibly Reuniting With LeBron James It appears Kyrie Irving will indeed be a free agent in one year, just in time for the Knicks to have cap space. Parker said he'd take Irving and the current Celtics group, which Broussard and Jennings basically scoffed at.

2 riders fall after Dayton roller coaster derails 2 riders fall after Dayton roller coaster derails That auto was carrying four people and two fell to the ground from a height of 34 feet, she said . About 10 people needed to be rescued from the ride on the Daytona Beach Boardwalk .

Egypt coach ‘very optimistic’ Salah will play opener Egypt coach ‘very optimistic’ Salah will play opener Salah's absence came as a surprise after coach Hector Cuper had said on Thursday he was nearly 100 percent certain to play. Many videos and photos have emerged from the team's practices showing Salah completing individual training.