US News: How Antarctica is melting from above and below - PressFrom - United Kingdom
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US News How Antarctica is melting from above and below

05:30  10 october  2019
05:30  10 october  2019 Source:   nationalgeographic.com

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Watch CBSN Live. Antarctica is melting from above and below . British Antarctic Survey. The findings come just days after a study found that the world's seas were rising faster than previously thought - much of that blamed on melting ice entering the ocean from West Antarctica and Greenland.

And if this underwater ice melts , that 's a real danger, because ice that rests on the seafloor below At high tide, Lau Lagoon's manmade islands barely rise above the waterline. During king tides and He and his colleagues examined how much of the ice below the sea surface has been getting Antarctica is the largest reservoir of freshwater on the planet, and has the potential to significantly

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The frozen mountains and icy plains of Antarctica hold enough water to raise global sea levels nearly 200 feet. Thankfully, over three-quarters of the continent is girded by ice shelves, the floating extensions of glaciers that protect the land-bound ice behind them like walls surrounding a vast, icy castle. But scientists are discovering new vulnerabilities that could weaken those walls from above and below.

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Antarctica ’s ice shelves are melting from warming ocean waters below —even The extra snowpack was minimal compared to how much solid ice melted from below . Sea ice is viewed aboard NASA's research aircraft in the Antarctic Peninsula region, on November 3, 2017, above Antarctica .

East Antarctica is remote even by Antarctic standards. That ’s left its massive stores of ice largely intact, especially compared to West Antarctica where a massive meltdown is under way that could raise seas by 10 or more feet in the coming centuries.

In the frigid realm of East Antarctica, tens of thousands of brilliant blue lakes are forming across ice shelves in the summertime—far more than scientists previously realized, according to a study published last month in Scientific Reports. Meanwhile, in rapidly-melting parts of West Antarctica, “upside down rivers” of warm water are gnawing away at the ice shelves’ weak spots from below, according to a study published Wednesday in Science Advances.

As the Earth continues to warm, both processes could hasten the demise of Antarctica’s icy armor and the giant glaciers it holds back.

Video: 'Sydney-sized' iceberg breaks off Antarctica (Sky News)

Invasion of the blue lakes

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East Antarctica is remote even by Antarctic standards. That ’s left its massive stores of ice largely intact, especially compared to West Antarctica where a massive meltdown is underway that could raise seas by 10 or more feet in the coming centuries.

John Abraham: Warming oceans melting Antarctic ice shelves could accelerate sea level rise. On the other hand, Antarctica is a massive land mass that is covered by ice formed from snowfall (called an ‘ice sheet’). This difference not only affects how these regions response to climate change, but it

For much of the year, the ice blanketing Earth’s polar regions is locked in a deep freeze. But on mild summer days, the surface of the ice begins to melt, draining into depressions and forming topaz blue lakes.

Beautiful as they are, these lakes are bad news for ice. Because of their dark color, they absorb more of the sun’s energy, triggering further warming. And under certain conditions, clusters of lakes can drain rapidly into the ice below them, causing it to break apart in a process known as “lake-induced hydrofracturing.”

For the past decade, scientists have been intensively studying these meltwater lakes across fast-warming parts of Greenland and the Antarctic Peninsula. Now, a team of researchers has conducted the first systematic survey of meltwater lakes in East Antarctica, the coldest part of the continent and home to its most stable ice.

They found a lot more lakes than they were expecting.

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East Antarctica is remote even by Antarctic standards. Harsh winds and ocean currents have largely cut off the region from the rest of the world. That ’s left its massive stores of ice largely intact, especially compared to West Antarctica where a massive meltdown is underway that could raise seas by 10 or

New analysis of Antarctica 's melting glaciers refines our understanding of climate change, while The sheer size of the Castle iceberg dwarfs the figure standing below .… They used that model to predict how the Greenland and Antarctic ice sheets will speed up their melting in the coming decades.

a group of people on a beach: Meltwater forms on the ice shelf next to McMurdo Station, Antarctica. © Photograph by Nicholas Bayou, UNAVCO

Meltwater forms on the ice shelf next to McMurdo Station, Antarctica.

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In fact, in satellite data from January 2017, the researchers identified a whopping 65,000 lakes and ponds spread across the East Antarctic coastline. “Pretty much everywhere we looked around the margin, you can see lakes,” says lead study author Chris Stokes, a glaciologist at Durham University in the UK. “That surprised us.”

More troubling than the number of lakes, though, was the fact that many of them seemed to be clustered in regions of ice shelves that could be vulnerable to collapse via hydrofracturing. “We’re much closer to those kinds of densities [that can cause hydrofracturing] than we thought we were,” Stokes says.

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Antarctica 's ice shelves are melting from warming ocean waters below —even The extra snowpack was minimal compared to how much solid ice melted from below . Sea ice is viewed aboard NASA's research aircraft in the Antarctic Peninsula region, on November 3, 2017, above Antarctica .

East Antarctica is remote even by Antarctic standards. That ’s left its massive stores of ice largely intact, especially compared to West Antarctica where a massive meltdown is underway that could raise seas by 10 or more feet in the coming centuries.

The study only looked at one melt season, and a weird one at that: In late 2016 and early 2017, mild weather and unusual atmospheric circulation patterns gripped Antarctica’s coastlines, causing its sea ice to crash. The scientists are planning to repeat their analysis with additional years of satellite data, Stokes said. But even if 2017 was an outlier, the study suggests some of East Antarctica's ice shelves could be more vulnerable to warm years than we thought.

And as Alison Banwell, a glaciologist at the University of Colorado Boulder who wasn’t involved with the paper, notes, “Atmospheric temperatures are warming, so we should expect to see more warm years.”

Gallery: The world's most beautiful glaciers & ice (Photo Services)

Upside-down rivers

As lakes raise concerns about the future of East Antarctica’s ice shelves, to the west an unseen force is attacking ice from below. Blobs of warm water are rising up from the deep, forming river-like channels that eat away at the bottoms of those ice shelves.

Several years back, Karen Alley, a glaciologist at the College of Wooster, began studying these so-called ‘upside down rivers’ via satellite imagery. By examining depressions at the surface of the ice, she could tell that some of them were enormous—up to three miles wide, tens of miles long, and hundreds of feet deep. She also noticed that the rivers frequently formed below what glaciologists call “shear margins,” weak points at the edges of ice shelves.

In their latest research, Alley and her co-authors used satellite imagery to try and understand why that is. As they report in their new paper, the formation of rivers beneath shear margins seems to start on the land, when flowing ice streams are stretched and thinned along their edges. When those stretch zones reach the ocean, they rise up relative to the thicker ice surrounding them, creating what looks like an inverted river bed running across the bottom of the shelf. Rising warm water gets funneled into that bed, forming an upside down river.

An iceberg floats in Andvord Bay, Antarctica, February 14, 2018. © Thomson Reuters An iceberg floats in Andvord Bay, Antarctica, February 14, 2018. The researchers found that the rivers are most likely to form beneath fast-flowing ice, including the ice shelves protecting West Antarctica’s imperiled Pine Island and Thwaites glaciers. And in general, “there were a lot more of these ice shelf channels on shear margins than we thought,” Alley says.

Nobody’s sure just how important upside down rivers are in hastening ice shelf breakup. But in earlier work on the Getz ice shelf, Alley discovered that the rivers can deepen rapidly, carving as much as 30 feet of ice out of the base of the shelf in a single year. If the water within these rivers becomes even a little warmer due to climate change, that thinning process could speed up dramatically.

“This could matter a little, or it could matter a lot,” Alley said. “But we know this makes it more likely that we lose ice shelves. These channels make the weak points weaker.”

A penguin stands on an iceberg in Yankee Harbour, Antarctica, February 18, 2018. © Thomson Reuters A penguin stands on an iceberg in Yankee Harbour, Antarctica, February 18, 2018. A two-pronged attack

Taken together, ephemeral lakes and hidden rivers point to poorly-understood weaknesses in Antarctica’s icy fortress. And the two phenomena could work in tandem to weaken ice.

Banwell said that the impact of surface lakes on ice shelves often depends on the strength of the shelf’s shear margin. A shear margin that’s been attacked from below by warm water, she said, might be more vulnerable to breakup due to lakes. And with both the atmosphere and the oceans warming due to climate change, the assault could be heating up on both fronts.

“I think in the future you’re going to get more and more of these lakes due to atmospheric warming,” Banwell says. “And a greater intensity of melting and ponding combined with these subsurface processes simply means these ice shelves are going to become more unstable.”

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