A23a, the world's largest?iceberg, has recently begun its?voyage?after being anchored to the ocean floor for more than three decades.?The gigantic iceberg, which covers about 4,000 square kilometres, is twice the size of London. It formed an ice island in the Weddell Sea after breaking off from the Antarctic coast in 1986.?
It is larger in thickness than Europe's highest skyscraper, the?London Shard, which stands 310 metres tall. Meanwhile, A23a was one of numerous icebergs that shattered from Antarctica's Filchner Ice Shelf.?
It is located near the north of the Antarctic Peninsula, which stretches from West Antarctica to South America.?
The British Antarctic Survey's satellite imagery shows the iceberg wending its way through the Weddell Sea in the Southern Ocean throughout 2022 and 2023, pushed by currents and winds spanning thousands of kilometres.
In late November, the ice mass extended just beyond the Antarctic Peninsula. The majority of icebergs from the Weddell Sea are carried by currents towards the "iceberg alley" in the South Atlantic, where they eventually melt.
According to the BBC, the iceberg is now moving swiftly and has the potential to travel beyond the oceans surrounding Antarctica.
Surprisingly, when this specific iceberg was first detached, it was topped by a Soviet research station. Moscow dispatched a crew to retrieve equipment from the Druzhnaya 1 facility, fearing it would be lost forever. The large iceberg, however, did not go far from the coast.
"I asked a couple of colleagues about this, wondering if there was any possible change in shelf water temperatures that might have triggered it," Dr. Andrew Fleming, a remote sensing expert with the British Antarctic Survey, revealed.?
Iceberg A23a "calved," or dropped off the continent's larger glacier, from the western side of the Ronne Ice Shelf and floated in the Weddell Sea before becoming entangled on the ocean floor in 1986.?
The ice chunk is roughly three times the size of New York City, measuring 1,500 square miles and weighing nearly a trillion metric tons. Because of its size, it is the world's largest iceberg, only briefly losing the title to iceberg A76 before it separated into three sections.?
The iceberg's course will take it from the Antarctic shallows to the wider Southern Ocean, passing through a region known as "iceberg alley," where other chunks of ice remain.?
It was grounded in 1986, but it was going to shrink in size enough to lose hold and start moving. "I discovered the first movement in 2020."
The gigantic iceberg is expected to travel towards the Antarctic Circumpolar Current before being forced into Iceberg Alley, a South Atlantic route. This route takes the iceberg out of the shallower Antarctic waters and into the larger Southern Ocean, where other ice chunks usually travel.?
Surprisingly, this journey parallels the historic route taken by explorer Sir Ernest Shackleton in 1916. According to the BBC, Ernest took this route during his brave escape from the region when his ship was destroyed by ice.
Scientists are keeping a tight check on A23a's journey since they are aware of the potential ramifications if it ends up in South Georgia.?The massive iceberg might cause major problems for the island's various wildlife, including seals, penguins, and seagulls who dwell there and have young.
The size of A23a may alter the usual methods by which these animals find food, making it difficult for them to adequately feed their pups.
The iceberg is not dangerous to people, but it may cause problems for wildlife such as penguins and seals if it becomes stranded in their feeding or breeding grounds in the Southern Ocean.??
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