Climate change: heat scattering section of Greenland ice shelf

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A large part of the ice has broken off from the Arctic’s largest remaining ice shelf – 79N, or Nioghalvfjerdsfjorden in north-eastern Greenland.

The eviction section covers about 110 sq km; Satellite imagery shows that it has been shattered into several smaller pieces.

There is further evidence of the damage that the rapid climate change scientists in Greenland say.

“The atmosphere in the region has been warmer since around 3C since 1980,” said Dr. Jenny Torton.

“It saw record summer temperatures in 2019 and 2020,” Poller Researcher from Friedrich-Alexander University in Germany told BBC News.

Nioghalvfjerdsfjorden, about 80 km long, is 20 km wide and is the floating front end of the Northeast Greenland Ice Stream – from where it flows into the sea.

At its major edge, the 79N glacier is split into two, with a small upheaval directly north. This offshoot or tributary, called the glacier, has now disintegrated.

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Copernicus Data / ESA / Sentinel-2B

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Ice is being attacked from the top and bottom

The ice facility was already heavily fractured in 2019; The heat of this summer has been its last undo. The Spalt Glacier has become a spring of icebergs.

Take a closer look at the satellite images and the high air temperatures recorded in the area are evident from the large number of melt ponds that sit on top of the shelf ice.

The presence of such liquid water is often problematic for ice platforms. If it fills crevasses, it can help open them. Water will push down on fragmentation, causing them to be known as hydrofracturing. This will weaken an ice shelf.

Oceanographers have also documented warmer ocean temperatures which mean that shelf ice is almost certainly melting from below.

Professor Jason Box of Denmark and the Geological Survey of Denmark and Greenland (GEUS) reported, “79N ” Arctic’s largest remaining ‘Arctic ice shelf after being lost to a considerable area of ​​Peterman Glacier in northwestern Greenland.” Has been made.”

“The thing that makes 79N so important is that it is attached to the inner ice sheet, and that means that one day – if the climate is warmer than expected – the region will likely act for the collapse of Greenland. Will become one of the major centers of the world. “

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Copernicus Data / ESA / Sentinel-2B

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The trunk of the N79 consists of molten ponds and streams

The Northeast Greenland Ice Stream contains about 15% of the internal ice sheet. The stream plunges its ice down to the N79 or glacial member just south, Zacharia Isström. Zacharia has already lost its temporary ice shelf area.

The Pro Box stated that the N79 could resist longer as it stood to the right at the front end of some islands. This gives a degree of stability. But, he adds, the shelf remains thin, though mostly returned along the trunk.

“This will likely lead to the N79 disintegrating from the middle, which is unique. I guess, though, it won’t be for 10 or 20 years. Who knows?” He told BBC News.

The July Arctic saw another large ice shelf structure that loses significant area. It was the Milne Ice Shelf on the northern margin of Ellesmere Island, Canada.

Eighty sq km was liberated from Milne, still a safe section just 106 sq km in size. The Milan was the largest intact relic from an extensive shelf facility that covered 8,600 sq km in the early 20th century.

The rapid melting speed in Greenland was outlined in a study last month that analyzed data from US-German Grace-FO satellites. These spacecraft are able to track changes in ice mass due to changes in the pull of local gravity. They essentially weigh the ice sheet.

The Grace Mission received a record-breaking year in 2019, with ice sheets of around 530 billion tonnes. The land has enough molten water flowing into the sea to raise the global sea level by 1.5 mm.

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