NASA Captures Stunning Close-Up Photos of Antarctica’s Massive Iceberg

(THIS ARTICLE IS COURTESY OF THE WEBSITE OF ‘GIZMODO’)

 

NASA Captures Stunning Close-Up Photos of Antarctica’s Massive Iceberg

The edge of A-68, the iceberg the calved from the Larsen C ice shelf in July 2017. (Image: NASA/Nathan Kurtz)

Back in July, satellite images showed an iceberg bigger than the state of Delaware calving and drifting away from Antarctica’s Larsen C ice shelf. Well, it’s summertime now in Antarctica, which means scientists are finally able to view this behemoth from up close—and the pictures are just as spectacular as we imagined.

Known as iceberg A-68, the gigantic slab of ice weighs about a trillion tons and features a surface area of 2,240 square miles (5,800 square kilometers). The berg is slowly drifting away from the Larsen C ice shelf, possibly heading towards the South Georgia and the South Sandwich Islands. As it floats away from the Antarctic Peninsula, A-68 is splintering and forming more icebergs in the process.

This past Sunday, November 12th, members of Operation Icebridge—a NASA-led initiative to produce detailed 3D maps of Antarctic and Arctic polar ice—flew a P-3 aircraft armed with a sophisticated array of measuring instruments to take a closer look.

A remarkable shot of A-69, revealing the extent of its size. (Image: NASA/John Sonntag)

“Perhaps you know the feeling: that moment when you see with your eyes something you have previously only seen in pictures,” wrote science writer Kathryn Hansen, who participated in the trip, in an article penned for NASA’s Earth Observatory. “Before today, I knew the Larsen C ice shelf only from the satellite images we have published since August 2016.”

A wide view showing iceberg A-68B (front), iceberg A-68A (middle) and the Larsen C ice shelf (back). (Image: NASA/Nathan Kurtz)

Hansen said she wasn’t prepared for the enormity of the iceberg, as most bergs she’s seen were relatively small and blocky.

“A-68 is so expansive it appears if it were still part of the ice shelf,” she said. “But if you look far into the distance you can see a thin line of water between the iceberg and where the new front of the shelf begins. A small part of the flight today took us down the front of iceberg A-68, its towering edge reflecting in the dark Weddell Sea.”

Who’s up for a swim!? Larsen C ice shelf (left) and iceberg A-68A (right). (Image: NASA/Nathan Kurtz)

In addition to taking photos, the Operational Icebridge scientists sought to measure the depth of water below iceberg, which they did using radar and a gravimeter.

IceBridge project scientist Nathan Kurtz and Sebastián Marinsek from Instituto Antártica Argentino observe Larsen C from a window on the P-3 aircraft. (Image: NASA/Kathryn Hansen)

Scientists now have the clearest picture yet of A-68, which will help them track and study its progress moving forward.

[NASA Earth Observatory]

ABOUT THE AUTHOR

George Dvorsky

George is a contributing editor at Gizmodo and io9.

Massive iceberg breaks away from Antarctica

(THIS ARTICLE IS COURTESY OF CNN)

Massive iceberg breaks away from Antarctica

(CNN) A massive iceberg weighing more than one trillion tons has broken away from western Antarctica, according to a UK-based research team.

Scientists from Project MIDAS had been monitoring a break in the Larsen C ice shelf — the fourth largest in Antarctica — following the collapse of the Larsen A ice shelf in 1995 and had observed significant advances in the rift over the past 12 months.

The rift, then spanning 70 miles, on Larsen C pictured in November last year.

Experts said the separation of a 5,800 square kilometers (2,239 square miles) section of Larsen C was confirmed to have broken away between Monday and Wednesday by NASA’s Aqua MODIS satellite, which is capable of producing images in thermal infrared at a resolution of 1 km.

See Newfoundland’s ‘Iceberg Alley’ in 360° 01:26
“We have been anticipating this event for months, and have been surprised how long it took for the rift to break through the final few kilometers of ice,” Professor Adrian Luckman of Swansea University, lead investigator of the MIDAS project said in a statement.
He told CNN the team believes the iceberg has remained intact adding, “This is part of the normal behavior of ice shelves. What makes this unusual is the size.”

Map showing iceberg detachment based on data from NASA dated July 12.

Scientists believe the iceberg — likely to be named A68 — has a volume twice that of Lake Erie in North America and is more than three times the size of the greater London area.

See how Iceland is melting in 360° 04:06
It’s half the size of the largest iceberg ever recorded: B15. With an area of 11,007 square kilometers (4,250 square miles) — about the size of the state of Connecticut or the island of Jamaica — it calved off Antarctica’s Ross Ice Shelf in March 2000.
With the iceberg now floating independently, the area of Larsen C has been reduced by more than 12%, forever changing the landscape of the peninsula, according to experts.

An aerial view of the Larsen C rift.

Luckman said that as the sheet of ice was already floating before it carved off the shelf “there will be no immediate impact.”
“This event does not directly affect anyone, and repercussions, if there are any, will not be felt for years. However, it is a spectacular and enormous geographical event which has changed the landscape.”
“We will study the ice shelf for signs that it is reacting to the calving — but we do not expect anything much to happen for perhaps years. Icebergs are routinely monitored by various agencies, and they will be keen to keep track of this one,” Luckman added.

Back in November, a satellite photo revealed just 5 km of ice connected the ice sheet to Larsen C.

Calving is a natural occurrence but scientists have been exploring if climate change may have played a role in expediting the rift.
The team of researchers have not yet found “any link to human-induced climate change,” Martin O’Leary, a Swansea University glaciologist and member of the MIDAS project team, said in a statement.

NATIONAL SNOW AND ICE DATA CENTER / NASA EARTH OBSERVATORY

Luckman added, “We have no evidence to link this directly to climate change, and no reason to believe that it would not have happened without the extra warming that human activity has caused. But the ice shelf is now at its most retreated position ever recorded and regional warming may have played a part in that.”
He continued, “This event does not directly affect anyone, and repercussions, if there are any, will not be felt for years. However, it is a spectacular and enormous geographical event which has changed the landscape

John McCain Says U.S. Global Leadership Was Better Under Obama Than Trump

(THIS ARTICLE IS COURTESY OF TIME.COM)

John McCain Says U.S. Global Leadership Was Better Under Obama Than Trump

11:20 AM ET

Arizona Republican Sen. John McCain said in a new interview that America’s standing in the world was better under former President Barack Obama than it is now under President Donald Trump.

McCain, Obama’s 2008 opponent who remained a vocal critic during his presidency, asked by The Guardian whether U.S. standing in the world was better under Obama. “As far as American leadership is concerned, yes,” McCain said.

He was also critical of Trump’s Twitter attacks against London Mayor Sadiq Khan following the recent terrorist attack in the city.

Pathetic excuse by London Mayor Sadiq Khan who had to think fast on his “no reason to be alarmed” statement. MSM is working hard to sell it!

McCain said Trump sent the message to the United Kingdom that, “America does not want to lead.”

 

“They are not sure of American leadership, whether it be in Siberia or whether it be in Antarctica,” McCain said.

175 Km Long Crack In Antarctic Ice Shelf: Largest Iceberg In Our Lifetime Is Possible

(THIS ARTICLE IS COURTESY OF THE BBC)

Plane flies along Antarctica’s giant Larsen crack

The British Antarctic Survey (BAS) has released new footage of the ice crack that promises to produce a giant berg.

The 175 km-long fissure runs through the Larsen C Ice Shelf on the eastern side of the Antarctic Peninsula.

If it propagates just 20km more, a block of ice a quarter the size of Wales will break away into the Weddell Sea.

Scientists gathered the new video while recovering instrumentation that had been placed on the ice shelf.

Uncertainty about the stability of the region means researchers cannot set up camp as they would normally do, and instead make short visits in a Twin Otter plane.

The most recent sortie enabled the researchers also to fly along the length of the crack, which is 400-500m wide in places, to assess its status.

No-one can say for sure when the iceberg will calve, but it could happen anytime.

At 5,000 sq km, it would be one of the biggest ever recorded.

When it splits, interest will centre on how the breakage will affect the remaining shelf structure.

The Larsen B Ice Shelf further to the north famously shattered following a similar large calving event in 2002.

The issue is important because floating ice shelves ordinarily act as a buttress to the glaciers flowing off the land behind them.

In the case of Larsen B, those glaciers subsequently sped up in the absence of the shelf. And it is the land ice – not the floating ice in a shelf – that adds to sea level rise.

If Larsen C were to go the same way it would continue a trend across the Antarctic Peninsula.

In recent decades, a dozen major ice shelves have disintegrated, significantly retreated or lost substantial volume – including Prince Gustav Channel, Larsen Inlet, Larsen A, Larsen B, Wordie, Muller, Jones Channel, and Wilkins.

Dr Paul Holland from BAS commented: “Iceberg calving is a normal part of the glacier life cycle, and there is every chance that Larsen C will remain stable and this ice will regrow.

“However, it is also possible that this iceberg calving will leave Larsen C in an unstable configuration. If that happens, further iceberg calving could cause a retreat of Larsen C.

“We won’t be able to tell whether Larsen C is unstable until the iceberg has calved and we are able to understand the behaviour of the remaining ice.”

The removal of the ice would also enable scientists to study the uncovered seabed.

When Larsen B broke away, the immediate investigation chanced upon new species.

Under the Antarctic Treaty, no fishing activity would be permitted in the area for 10 years.

The big bergs that break away from Antarctica are monitored from space.

They will often drift out into the Southern Ocean where they can become a hazard to shipping.

The biggest iceberg recorded in the satellite era was an object called B-15.

Covering an area of some 11,000 sq km, it came away from the Ross Ice Shelf in 2000.

Six years later fragments of the super-berg passed by New Zealand.

In 1956, a berg of roughly 32,000 sq km – bigger than Belgium – was spotted in the Ross Sea by a US Navy icebreaker. But there were no satellites at that time to follow-up.

Many of the bergs that break away from the Weddell Sea area of Antarctica get exported into the Atlantic. A good number get caught on the shallow continental shelf around the British overseas territory of South Georgia where they gradually wither away.

The study of the Larsen C Ice Shelf is led by Swansea University through its MIDAS Project, which involves BAS.

South GeorgiaImage copyright THINKSTOCK
Image caption The remnants of many such bergs end up at South Georgia

[email protected] and follow me on Twitter: @BBCAmos

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