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Scientists discover new mechanism at work breaking-up icebergs

An international team of scientists has discovered a previously unknown mechanism by which large tabular icebergs break up out at sea as part of a study carried out on the Peterman Iceberg in Baffin Bay over the summer. Scientists observed that the gradual creation of a huge underwater ice foot produced so much buoyancy that it broke large chunks off the main iceberg thus causing the iceberg to slowly disintegrate. This discovery was captured on camera as a film crew followed the expedition for Operation Iceberg, a two part BBC Two series going out this week.
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The Hibernia platform is uniquely designed to resist the impact of sea ice and icebergs. It can withstand the impact of a one-million tonne iceberg with no damage. It can withstand contact with a six million tonne iceberg, estimated to be the largest that can drift into that water depth and only expected once in 10,000 years, with repairable damage.
Because the Hibernia platform is located in relatively shallow water - just 80 metres deep - the odds of a large iceberg ever hitting the platform are extremely low. And those odds are lessened considerably by Hibernia's aggressive Ice Management Strategy, a combination of science, technology, teamwork and old-fashioned seafaring skill.

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Icebergs
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Giant icebergs head to watery end at island graveyard

South Georgia is the place where colossal icebergs go to die.
The huge tabular blocks of ice that frequently break off Antarctica get swept towards the Atlantic and then ground on the shallow continental shelf that surrounds the 170km-long island.
As they crumble and melt, they dump billions of tonnes of freshwater into the local marine environment.

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Massive, historic calving sets up for 'trip of a lifetime' at Glacier Explorers

Thirty to 50 million tonnes of ice has crashed off the Tasman Glacier Terminal Face in a massive calving that has resulted in at least 20 significant 'bergs floating in the Tasman Glacier Terminal Lake - adding more drama and spectacle to an already dramatic landscape.
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Petermann glacier Iceberg
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Greenland glacier gives birth to giant iceberg

Envisat has been observing a rare event in the Arctic since early August - a giant iceberg breaking off the Petermann glacier in North-West Greenland.
The Petermann glacier is one of the largest glaciers connecting the Greenland inland ice sheet with the Arctic Ocean. Upon reaching the sea, a number of these large outlet glaciers extend into the water with a floating 'ice tongue'.

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Greenland ice island
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Greenland glacier calves island 4 times the size of Manhattan

A University of Delaware researcher reports that an "ice island" four times the size of Manhattan has calved from Greenland's Petermann Glacier. The last time the Arctic lost such a large chunk of ice was in 1962.
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B-9B and C-28
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B-9Biceberg.jpg

This image shows the 97-km long B-9B iceberg (right) ramming into the Mertz Glacier Tongue in Eastern Antarctica in early February. The collision caused a chunk of the glacier's tongue to snap off, giving birth to another iceberg nearly as large as B-9B.
The new iceberg, named C-28, is roughly 78-km long and 39-km wide, with a surface area of 2500 sq km (the size of Luxembourg).
Since the collision, the two icebergs have drifted together into a polynya, which is an area of open water surrounded by sea ice. Polynyas produce dense, cold, and salty water - known as 'bottom water' - that sinks to the sea bottom and drives ocean circulation.

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B9B iceberg the size of Luxembourg strikes Antarctica, shaves off new iceberg from Mertz Glacier

A massive iceberg struck Antarctica, dislodging another giant block of ice from a glacier, Australian and French scientists said Friday.
The two icebergs are drifting together about 100 to 150 kilometres off eastern Antarctica following the collision on Feb. 12 or 13.

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An iceberg about the size of Luxembourg that struck a glacier off Antarctica and dislodged another massive block of ice could lower the levels of oxygen in the world's oceans, Australian and French scientists said Friday.
The two icebergs are now drifting together about 100 to 150 kilometres off Antarctica following the collision on Feb. 12 or 13, said Australian Antarctic division glaciologist Neal Young.

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B15K
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German oceanographers in Antarctica used underwater microphones this month to listen in on a massive iceberg crashing into the Antarctic ice-shelf, which cause a 2 000- metre crack, the ice lab headquarters said on Monday.
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