The giant Antarctic iceberg the size of Manhattan completely disintegrated, experts “worried” – tech2.org

The giant Antarctic iceberg the size of Manhattan completely disintegrated, experts “worried”



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A One Trillion Ton Iceberg Releases from Antarctica Reuters

A giant Antarctic iceberg, the size of Manhattan, which split off from the Pine Island Glacier (PIG) ​​two months ago, disintegrated completely, which generated concern among experts.

PIG is widely regarded as one of the fastest melting Antarctic glaciers and the disintegration of this iceberg is raising concerns about the possibility that the western Antarctic glacier will become an even greater contributor to sea level rise .

The 100-square-mile iceberg was already considered unstable when it separated from the PIG in September. It was estimated by experts as the fifth largest calving event since 2000.

Scientists expected the iceberg to drift further into the Southern Ocean, but its approach to the ocean was blocked by thick sea ice before disintegrating into icebergs more little ones.

"What we are witnessing in Pine Island Glacier is worrisome, we are now seeing changes in the delivery behavior of the ice shelf, when for 68 years we saw a pattern of advance and retreat that resulted in the birth of a single A large iceberg that left the ice front in approximately the same place, "Dr. Robert Larter, marine geophysicist at the British Antarctic Survey, said in a statement.

"The birth of icebergs in 2001, 2007 and 2013 is well documented, with each calving event returning the ice front to more or less the same position and the ice shelf flowing back to the sea, but with continuous thinning it became clear that sooner or later there would have to be a change in this pattern, and this is what we are witnessing now, "Dr. Larter added.

PIG is the fastest melting glacier in Antarctica and is responsible for the loss of almost a quarter of land ice from the frozen continent: around 45 billion tons of ice lost each year. The mbadive birthing event in September was important because it was the first time since 1947 that experts observed a "systematic withdrawal" of the ice front.

"If the ice shelf continues to thin and the ice front continues to recede, the effect on the PIG will decrease, which will probably lead to further dynamic thinning and retreat of the glacier," said Dr. Larter. "The PIG already makes the greatest contribution to the sea level rise of a single Antarctic glacier and the fact that its bed increases in depth upstream for more than 200 km means that there is a possibility of a receding of the track that would give even greater contribution to the sea level. "

  Antarctic iceberg
Satellite images of the disintegration of the iceberg that stopped at Pine Island Glacier in September
British Antarctic Survery
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