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A68 iceberg on collision path with South Georgia

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A68 iceberg on collision path with South Georgia Empty A68 iceberg on collision path with South Georgia

Bài gửi by chanchai Wed Nov 04, 2020 12:03 pm

A68 iceberg on collision path with South Georgia _115211747_a68a-nc
The world's biggest iceberg, known as A68a, is bearing down on the British Overseas Territory of South Georgia.
The Antarctic ice giant is a similar size to the South Atlantic island, and there's a strong possibility the berg could now ground and anchor itself offshore of the wildlife haven.
If that happens, it poses a grave threat to local penguins and seals.
The animals' normal foraging routes could be blocked, preventing them from feeding their young properly.
And it goes without saying that all creatures living on the seafloor would be crushed where A68a touched down - a disturbance that would take a very long time to reverse.
"Ecosystems can and will bounce back of course, but there's a danger here that if this iceberg gets stuck, it could be there for 10 years," said Prof Geraint Tarling from the British Antarctic Survey (BAS).
"And that would make a very big difference, not just to the ecosystem of South Georgia but its economy as well," he told BBC News.
A68 iceberg on collision path with South Georgia _115214076_gettyimages-817423324
The British Overseas Territory is something of a graveyard for Antarctica's greatest icebergs.
These tabular behemoths get drawn up from the White Continent on strong currents, only for their keels to then catch in the shallows of the continental shelf that surrounds the remote island.
Time and time again, it happens. Huge ice sculptures slowly withering in sight of the land.
A68a - which has the look of a hand with a pointing finger - has been riding this "iceberg alley" since breaking free from Antarctica in mid-2017. It's now just a few hundred km to the southwest of the BOT.
Roughly the size of the English county of Somerset (4,200 sq km), the berg weighs hundreds of billions of tonnes. But its relative thinness (a submerged depth of perhaps 200m or less) means it has the potential to drift right up to South Georgia's coast before anchoring.
"A close-in iceberg has massive implications for where land-based predators might be able to forage," explained Prof Tarling.
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