Antarctica: Nasa shares close-up photos of large PIG iceberg



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PIG BergImage copyright
NASA ICEBRIDGE / Brooke Medley

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Icebergs parting from the front of the glaciers ending at the sea

This week scientists analyzed for the first time the great new iceberg of the Pine Island Glacier (PIG) ​​breakwater in Antarctica.

The block, which has the designation B-46, initially covered 225 square kilometers.

Given the fashion in recent years of comparing these icebergs with the area of ​​Manhattan Island, this would have made this three times the size of the famous New York district.

But NASA's flyby on Wednesday shows the iceberg is already separating.

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The US space agency DC-8 was on a routine expedition as part of the IceBridge project, which measures the elevation of ice surfaces with a laser.

Researchers on board were able to point their cameras out of the aircraft windows and capture some of the scale and beauty of the frozen scene below.

PIG drains a vast area of ​​West Antarctica which is roughly equivalent to two-thirds of the area of ​​the United Kingdom. The glacier regularly runs large pieces of its floating front, or platform, which pushes towards the Amundsen Sea.

This particular berg came out in October and was first noticed by satellites.

PIG BergImage copyright
NASA-USGS LANDSAT / EARTH OBSERVATORYT

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This last iceberg separated from the PIG in October

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The production of icebergs on the front edge of an ice shelf is part of a very natural process.

It's like a system of glaciers like Pine Island maintains balance: the ejection of iceberg inevitably follows the accumulation of snow inside.

PIG BergImage copyright
NASA ICEBRIDGE / Kate Ramsayer

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Forms of sea ice in a rift created when the B-46 separated from the PIG

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That said, the PIG is under strict scrutiny because it has shown evidence of thinning and acceleration.

Long-term satellite studies indicate that it has dumped considerable volumes of ice into Amundsen Bay, raising global sea levels.

RiftImage copyright
NASA ICEBRIDGE

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The PIG drains an area of ​​Western Antarctica that is about two-thirds the size of the United Kingdom.

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The name of the new iceberg comes from a classification system conducted by the US National Ice Center, which divides Antarctica into quadrants.

Quadrant A covers the Amundsen Sea sector and this block is the 46th in the series. It – and all major secondary blocks – will need to be tracked because of the potential risk of shipping.

B-46 is overshadowed by the mighty A-68 berg, which separated from the Larsen C ice shelf in 2017. It covers an area approaching 6,000 km2.

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