Antarctica Has Lost 3 Trillion Tonnes of Ice Since '92
14 Juin, 2018, 06:10 | Auteur: Therese Cote
"According to our analysis, there has been a step increase in ice losses from Antarctica during the past decade, and the continent is causing sea levels to rise faster today than at any time in the past 25 years".
"We now have an unequivocal picture of what's happening in Antarctica", said co-lead author Eric Rignot, a scientist at NASA's Jet propulsion Laboratory who has been tracking Earth's ice sheets for two decades.
The West Antarctic ice sheet has lost almost three trillion tonnes of ice during this span - with a large chunk of the numbers coming in the last few years, according to research.
But afterwards, that sped up remarkably, resulting in a three-fold increase from 2012 to 2017, during which the continent lost some 219 billion tonnes of ice every year, pushing the ocean up 0.6 mm annually. Meanwhile, in the Antarctic Peninsula, the annual rate of ice loss increased from around 7 billion tons from 1992 to 2012 to 36 billion tons from 2012 to 2017, largely due to collapsing ice shelves. That's an 146-billion-metric-ton leap.
"We depend upon the satellite measurements to not only tell us how the ice sheets respond but also to make these calculations to sea-level contribution", Shepherd said. "Thanks to the satellites our space agencies have launched, we can now track their ice losses and global sea level contribution with confidence".
"This is a concerning thing if you consider that ice shelves exist around 75 per cent of the periphery of Antarctica".
"The increasing mass loss that they're finding is really worrying, particularly looking at the West Antarctic, the area that's changing most rapidly and it's the area that we're most anxious about, because it's below sea level, " said Christine Dow, a glaciologist at the University of Waterloo in Canada who was not involved in the research.
West Antarctica is now bearing the brunt of this loss, as its glacial ice shelves have been melted from below by warming deep ocean water.
"We're watching these reports closely", said Michiel van den Broeke, professor of Polar Meteorology at Utrecht University in the Netherlands, saying they were the guide for defending the Dutch coast.
Un couple d'Australiens se tue en prenant un selfie — Portugal
Le couple, âgé d'environ trente ans, a trouvé la mort sur la plage dos Pescadores, chutant du haut d'un mur de près de 40 mètres. Selon les services de secours portugais ce mardi, ce drame est survenu alors qu'ils essayaient probablement de faire un selfie .
"Whilst there's still considerable uncertainty about East Antarctica mass balance, it is increasingly clear that ice loss from West Antarctica has accelerated", said Kate Hendry, a researcher at the University of Bristol, commenting on the findings.
"We are confident in our understanding of ice mass change in Antarctica and its impact on sea levels".
If all that ice melted, it would be enough to raise the world's sea levels by roughly 200 feet (60.96 metres). A tripling every decade, were it to continue, would reach that volume of sea level rise even sooner. But as the Post notes, "There is no proof the current rate of change in Antarctica will continue".
"I don't know if it's going to keep exactly tripling, but I think it has a lot of potential to keep significantly increasing, " said Velicogna.
"The fate of Antarctica, the fate of Greenland, is the fate of Miami", she said.
Much of the melt-off is coming from the Pine Island and Thwaites Glaciers, victims of climate change.
There have been many other estimates of how much ice has melted in Antarctica.
That's because as Antarctica's mass shrinks, the ice sheet's gravitational pull on the ocean relaxes somewhat, and the seas travel back across the globe to pile up far away - with USA coasts being one prime destination. And many of those papers showed different results. "This has to be a concern for the governments we trust to protect our coastal cities and communities", said Shephard.
Rising sea levels can have a risky impact on coastal habitats and communities as flooding increases along with higher tides and stronger storm surges. "Put simply if we can not collectively tackle climate change, then it's unlikely we will maintain Antarctica as a place for peace, nature and science".
Her great-great grandmother Mary was born here and she says there's something magical about "fitting in a piece of the puzzle". Instead, front and center with Queen Elizabeth and Prince Charles was Kate Middleton, the Duchess of Cambridge .
The US wants North Korea to get rid of its nuclear weapons in an irreversible manner that can be verified by the global community. For the first time since the division of the Korean Peninsula, the leaders of the two countries held a summit in June 2000.
President Donald Trump declared the biggest enemy of the United States to be "the Fake News" in a tweet on Wednesday. Dear journalists, once again: When someone declares war on you and on freedom of expression, you have two options.
It was the Feds seventh rate increase since it began tightening credit in 2015, and it followed an increase in March this year . The latest rate increase was in line with investors' expectations ahead of the release of the policy statement .
The Fed anticipates that inflation will overshoot its 2% target this year; in March, officials saw that happening only in 2020. Powell has repeatedly played down the dot plot as a guide to future interest rates, though investors continue to focus on it.
Once the World Cup is over and the players begin to return from their holidays, preparation will begin for the 2018/19 campaign. Arsenal have announced that they will play Chelsea in a preseason game in Dublin on August 1.
PEOPLE magazine says he popped the question last week. "It's nothing they've been hiding". "It's a recent engagement". It's a 3.03 carat diamond set in platinum made by NYC jeweler Greg Yuna, also known as Mr.
If that wasn't bad enough, they rebelled in different directions, with 75 voting for EEA membership, and 15 voting against. A total of 89 Labour MPs defied Corbyn in the vote on this amendment, making it the party's biggest Brexit rebellion yet.
USA, Canada and Mexico to host 2026 FIFA World Cup
The 2026 World Cup will be the first expanded tournament featuring 48 teams, up from the current 32-team competition. There has been success on the women's side and the men's game has been waiting for something like this, he said.
Newshour, Summit could give South Korea 'hope for peace'
They then moved into a roughly 40-minute one-on-one meeting, joined only by their interpreters, before including their advisers. For Kim, one of the chief tasks from the summit - a legitimizing photo-op with a US president - is now all but guaranteed.
Promo intime : les photos dénudées de Beyoncé et Jay Z
Plus poétiques que vulgaires, ces photos ont beaucoup fait parler les fans qui restent fascinés par ces clichés intimes du couple. De nouveau unis sur scène , les deux tourtereaux ont entamé une nouvelle tournée commune, le On The Run II Tour en Europe.
Donald Trump and Kim Jong Un's Historic Summit in Singapore
At one point, Trump pointed down to the ground and Kim seemed to nod, playing along in what was a carefully choreographed moment. Kim and Trump will first meet one-on-one in a closed session, before a larger meeting with key advisers, USA officials said.
FactCheck: What happened to Brexit in Parliament yesterday?
This is where Conservative rebels like Nicky Morgan, Anna Soubry and Ken Clark are expected to make their biggest move on customs. The Lords' amendment, which MPs rejected, went further in requiring the withdrawal agreement to be placed on a statutory footing.
Fox Merger Eyed After AT&T-Time Warner Ruling
Outside of court, however, critics of the lawsuit pointed to Trump's frequent criticism of CNN , which is owned by Time Warner. But hey, if Comcast does wind up with Fox, you can just change your dreams and begin contemplating a world where Alien vs.