After months of drift, the world’s largest iceberg stopped near the island of Georgia do Sul, in the southern Atlantic Ocean.
Although a scenario of “Titanic II” is not very likely and the region’s penguins seem to be safe, the iceberg may be a symptom of unwanted changes in Antarctica and the planet.
How did we get here?
The iceberg, officially known as A23A, was born in 1986, when he detached from another iceberg, the A23, who had separated from Antarctica earlier that year. The process of separating a smaller piece of ice from a larger mass is called “calving” (detachment).
His initial life was quiet; He remained in the sea of Weddell, east of the Antarctic Peninsula for decades.
The A23A trips began in 2020, when he broke free from the bottom of the sea and began to move. In 2023, he was ready to completely leave the antarctic waters.
In spring, his progress was interrupted when he began to rotate in the same place, trapped in a chain known as Taylor’s column, near the southern orcades islands.
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After several months turning, he managed to escape and headed towards Georgia do Sul, an island east of the southern end of South America, which is a British territory and houses a few dozen people, as well as many seals and penguins.
So after that, did he just stop?
Yes. He could not reach southern Georgia and is now stuck on the continental shelf, about 80 kilometers from the island.
So far, it seems to be still peacefully and has not begun to fragment into smaller pieces, as other great icebergs did after separated from Antarctica.
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What is the size of this iceberg?
Initially, it was measured with about 3,885 square kilometers. It has lost part of this size, but it is still believed to have more than 3,367 square kilometers. By comparison, New York City is 777 square kilometers.
Icebergs of this size are rare, said Andrew Meijers, the British Antarctic Survey Oceanographer, in a statement on the group’s website. “There have been two other similar size icebergs in the same region in the last five years or more, and sporadically before that,” he said.
“It looks like Earth, this is the only way to describe it,” said Alexander Brearley, British’s physical oceanographer Antarctic Survey last summer.
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The iceberg that sank the Titanic was about 400 meters long, something ridiculously small compared.
“A23a” is a boring name. They could have chosen something better.
This is science for you. “A” indicates the region of Antarctica where the iceberg was formed. The numbers are attributed sequentially, and the small “A” means that it has detached itself from a larger iceberg.
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More creative names, such as “Superberg” or “ice monster”, would unfortunately be uncovered.
What’s next?
The A23a will begin to fragment and melt, although this probably takes some time, perhaps years.
“Now that it is stranded, it is even more likely to break due to increased tensions, but this is virtually impossible to predict,” said Meijers. “Great icebergs have reached the north before – one reached 1,000 kilometers from Perth, Australia once – but all inevitably fragmented and melt quickly afterwards.”
Is this good or bad?
It is unlikely that the seals and penguins of Georgia do Sul will be affected by the iceberg. Still, “potentially, it can interrupt their path to food sites and force adults to spend more energy to get around it,” said Meijers. “This can reduce the amount of food that returns to the puppies on the island, increasing mortality.”
Iceberg also contains nutrients that are released into the sea as it melts: “If the iceberg is stimulating ocean productivity, it can actually increase local predator populations such as seals and penguins,” he said.
“It seems that the ocean is sculpting the iceberg, and there are some visible cracks on the surface of the ice as it responds to tension changes,” said Indrani das, glacologist at Columbia University Lamont-Doherty Observatory.
“Over time, the ocean will sculpt more deeply, making it begin to fragment even more. At some point, it may even get unstable and to tip off. Given its size, this can take years. ”
There is little fear of a “Titanic II”, as boats in the region will be well aware of the location of Iceberg. However, since the A23A fragments, the smaller pieces will be more difficult to track, increasing the danger.
But while iceberg itself may represent little direct threat, it may be a symptom of problems in Antarctica.
Ice platforms have lost billions of tons of ice in the last 25 years, which scientists have attributed to climate change. Losing all this ice can contribute to increasing sea level.
“The weather is changing, and this is impacting how ice platforms melt,” he said in 2023, when the iceberg was still in motion. “Ice platforms are losing mass because the ocean is warming up. Detachment is a natural process, but this natural detachment can be intensified by climate change. ”
Still, it has always happened. Giant icebergs “are a completely normal part of Antarctic and Greenland’s ice cycle life cycle,” said Meijers.
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