Wednesday, 21 November, 2018

Ice loss in Antarctica is increasingly contributing to global sea level rise

Media playback is unsupported on your device                  Media caption Pippa Whitehouse Media playback is unsupported on your device Media caption Pippa Whitehouse"Push a balloon filled with honey- it rebounds when you remove your hand
Frank Williams | 16 June, 2018, 11:03

The frozen continent lost nearly 3 trillion tons of ice between 1992 and 2017, the 84 scientists said in what they called the most complete overview of Antarctic ice to date.

The assessment is an analysis of 24 different satellite-based measurements of ice loss on the continent, making it one of the most comprehensive studies of Antarctic melting to date. This has led to an increase in sea levels of roughly three-tenths of an inch, which doesn't seem like much.

The worldwide team, led by NASA, the University of Leeds and the European Space Agency, combined 24 satellite surveys between 1992 and 2017.

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.

Overall, scientists say the melting ice in Antarctica is responsible for about one-third of all sea-level rise around the world. Just two glaciers in this sheet, Thwaites and Pine Island, now contribute about half of Antartica's annual ice mass loss, according to the study's authors.

"The data from these spacecraft show us not only that a problem exists but that it is growing in severity with each passing year", explains NASA researcher Isabella Velicogna from the University of California, Irvine. That's an 146-billion-metric-ton leap.

If the volcanoes are active, they could erupt at any moment, melting vast amounts of ice and contributing to the already worrisome rising sea levels endangering large swathes of coastal populations around the globe.

Reduced sea ice coverage since the late 1980s has led to increased exposure of ice shelves on the Antarctic Peninsula to ocean swells, causing them to flex and break.

Shepherd and his team ran similar calculations five years ago, using 20 years of data, but were unable to say much except that Antarctica seemed to be losing mass at a steady rate.

That said, it is worth noting the researchers have cautioned the processes that helped the ice sheet recover back in the day might not work in the present-day scenario of rapid melting due to human activity. 'There are no other plausible signals to be driving this other than climate change'.

That has made global oceans rise around 7.6 millimetres. But what concerns scientists is the balance of how much snow and ice accumulates in a given year versus the amount that is lost.

Kim summit achieved NOTHING, leaked government paper reveals
In the annual world press freedom rankings by the group Reporters Without Borders, North Korea ranks last - 180 out of 180. Trump on Friday also said Michael Cohen is no longer his lawyer, although he didn't elaborate on that much.

In Antarctica, it's mostly warmer water causing the melt.

Most of this ice loss has come from West 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.

The satellite missions providing data for this study are NASA's Ice, Cloud and land Elevation Satellite (ICESat); the joint NASA/German Aerospace Center Gravity Recovery and Climate Experiment (GRACE); ESA's first and second European Remote Sensing satellites, Envisat and CryoSat-2; the European Union's Sentinel-1 and Sentinel-2 missions; the Japan Aerospace Exploration Agency's Advanced Land Observatory System; the Canadian Space Agency's RADARSAT-1 and RADARSAT-2 satellites; the Italian Space Agency's COSMO-SkyMed satellites; and the German Aerospace Center's TerraSAR-X satellite.

"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.

The ice sheet mass balance inter-comparison exercise (IMBIE) is an worldwide effort: a team of 84 polar scientists from 44 organisations, including both of us, working together to provide a single, global record of ice loss from Earth's polar ice sheets.

Shepherd said: "We have long suspected that changes in Earth's climate will affect the polar ice sheets".

More than 70% of the recent melt is in West Antarctica.

The report said the most dramatic increase has been fixed in 2007-2012 when Antarctica lost 160 billion tonnes of ice each year.

"The detailed record shows an acceleration, starting around 2002", said Beata Csatho, a co-author of the study, and a glaciologist at the University at Buffalo. The water nibbles at the floating edges of ice sheets from below.

Recommended

Aston Martin Rapide AMR debuts with 595hp and limited numbers Aston Martin Rapide AMR debuts with 595hp and limited numbers The Aston Martin Rapide AMR has been revealed, sporting racy looks, more power, and a super limited production run. Following in the footsteps of the Aston Martin DB11 AMR , the British marque has now unveiled the Rapide AMR .

Wetherspoon’s to serve more UK and non-EU drinks Wetherspoon’s to serve more UK and non-EU drinks Swedish cider Kopparberg makes it past the cull, due to the company's decision to make its cider in United Kingdom after Brexit. Alcohol-free Adnams Ghost Ship brewed in Suffolk will replace the German-made alcohol-free beer from Erdinger.

The Trump Presidency: Trump announces 25% tariff on Chinese goods The Trump Presidency: Trump announces 25% tariff on Chinese goods He has identified reducing the $375 billion annual trade deficit with China as a key test of his "America First" trade strategy. The country's Commerce Ministry said China will apply tariffs on U.S. goods at the "same scale and the same strength".

Volkswagen Fined For Diesel Emission Scandal Volkswagen Fined For Diesel Emission Scandal Since then investigators have been trying to unravel who was responsible for the installation of such so-called "defeat devices". The firm must also buy back or fix 85% of the vehicles involved in the case by June 2019, or face higher payments for emissions.

Massive Martian Dust Storm Threatens Plucky NASA Rover Massive Martian Dust Storm Threatens Plucky NASA Rover NASA's Curiosity rover is elsewhere on the planet, on the edge of the current dust storm , but it also doesn't need sunlight. That's because it may not be able power its electronic circuits enough to prevent severe cold on Mars from damaging them.

Apple signs Oprah Winfrey to multiyear programme deal Apple signs Oprah Winfrey to multiyear programme deal Netflix ignited the current talent wars with aggressive nine-figure deals for Shonda Rhimes and Ryan Murphy. On television, Winfrey's Harpo Productions developed daytime TV shows like "Dr.

Thousands Stranded In Charlotte After Glitch Shuts Down All American Airline Flights Thousands Stranded In Charlotte After Glitch Shuts Down All American Airline Flights PSA operates 35 Bombardier CRJ200 aircraft, 40 Bombardier CRJ700 aircraft and 54 Bombardier CRJ900 aircraft. American grounded 400 PSA flights Friday, after 275 cancellations Thursday.

Microsoft To Release Surface Pro 6 In 2019 Microsoft To Release Surface Pro 6 In 2019 You may also see the high-end Microsoft Surface Pro 6 as the successor of Surface Pro 5 but it will take a while to get launched. Nonetheless, the company could possibly change before the products are launched or it could possibly be disregarded.

1 deputy killed, another shot in court building 1 deputy killed, another shot in court building Police Chief Terry Zeigler said on Twitter that the department is working a major incident but provided no further details. Bailiff said the inmate was being taken across the street from the jail, to the services building, for a court hearing.

RE: Polestar Engineered performance packages launched - Page 1 - General Gassing RE: Polestar Engineered performance packages launched - Page 1 - General Gassing The XC60, for one, has an electric-only range of 18 miles, good enough for tooling around town or to work. Power output from the T8 Twin Engine is increased from 390PS and 640Nm to 415PS, with 670Nm of torque.

This company just sold one million phones in 22 days This company just sold one million phones in 22 days The successor to the Bullets V2, OnePlus Bullets Wireless was unveiled alongside the company's 2018 flagship, the OnePlus 6 . Previously, OnePlus's benchmark for that goal was three months, with both the OnePlus 5 and OnePlus 5T earning that trophy.

Disgraced Theranos founder Elizabeth Holmes indicted on criminal charges Disgraced Theranos founder Elizabeth Holmes indicted on criminal charges The DOJ claims that Holmes and Balwani knew Theranos' product wasn't as effective as the company had been describing. Elizabeth Holmes is no longer the CEO of Theranos as she faces charges of wire fraud.

Trump announces tariffs on $50 billion in Chinese imports Trump announces tariffs on $50 billion in Chinese imports The US has said the punitive measures have been created to combat what it says is theft of its intellectual property . China has targeted $50 billion in US products for potential retaliation. "It's not going to do any good".

Handshakes to kick off series at The Oval Handshakes to kick off series at The Oval "Everyone just wants to listen to them talk and we can't get enough of them". But Paine concedes Australia must prove they are reformed characters.

Trump says Michael Cohen is not his lawyer Trump says Michael Cohen is not his lawyer Cohen reportedly feels abandoned by Trump and his administration. "Malicious attacks on Mr. Cohen's current lawyer did not immediately respond to a request for comment from CNBC.