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World’s Largest Iceberg Breaks Free, Heads toward Southern Ocean

A satellite imagery of the world's largest iceberg, named A23a, seen in Antarctica, November 15, 2023. (Courtesy of European Union/Copernicus Sentinel-3/Handout via Reuters)
A satellite imagery of the world's largest iceberg, named A23a, seen in Antarctica, November 15, 2023. (Courtesy of European Union/Copernicus Sentinel-3/Handout via Reuters)
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World’s Largest Iceberg Breaks Free, Heads toward Southern Ocean

A satellite imagery of the world's largest iceberg, named A23a, seen in Antarctica, November 15, 2023. (Courtesy of European Union/Copernicus Sentinel-3/Handout via Reuters)
A satellite imagery of the world's largest iceberg, named A23a, seen in Antarctica, November 15, 2023. (Courtesy of European Union/Copernicus Sentinel-3/Handout via Reuters)

The world's largest iceberg is on the move for the first time in more than three decades, scientists said on Friday.

At almost 4,000 square km (1,500 square miles), the Antarctic iceberg called A23a is roughly three times the size of New York City.

Since calving off West Antarctica's Filchner-Ronne Ice Shelf in 1986, the iceberg — which once hosted a Soviet research station — has largely been stranded after its base became stuck on the floor of the Weddell Sea.

Not anymore. Recent satellite images reveal that the berg, weighing nearly a trillion metric tons, is now drifting quickly past the northern tip of the Antarctic Peninsula, aided by strong winds and currents.

It's rare to see an iceberg of this size on the move, said British Antarctic Survey glaciologist Oliver Marsh, so scientists will be watching its trajectory closely.

As it gains steam, the colossal berg will likely be launched into the Antarctic Circumpolar Current. This will funnel it toward the Southern Ocean on a path known as "iceberg alley" where others of its kind can be found bobbing in dark waters.

Why the berg is making a run for it now remains to be seen.

"Over time it's probably just thinned slightly and got that little bit of extra buoyancy that's allowed it to lift off the ocean floor and get pushed by ocean currents," said Marsh. A23a is also among the world's oldest icebergs.

It's possible A23a could again become grounded at South Georgia island. That would pose a problem for Antarctica's wildlife. Millions of seals, penguins, and seabirds breed on the island and forage in the surrounding waters. Behemoth A23a could cut off such access.

In 2020, another giant iceberg, A68, stirred fears that it would collide with South Georgia, crushing marine life on the sea floor and cutting off food access. Such a catastrophe was ultimately averted when the iceberg broke up into smaller chunks — a possible end game for A23a as well.

But "an iceberg of this scale has the potential to survive for quite a long time in the Southern Ocean, even though it's much warmer, and it could make its way farther north up toward South Africa where it can disrupt shipping," said Marsh.

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Monkeys Who Recently Died in Hong Kong's Zoo Had Been Infected with Melioidosis

Giant tubeworms on the seafloor surface at 2,500 meters water depth at the East Pacific Rise, a volcanically active ridge located where two tectonic plates meet on the floor of the Pacific Ocean in this undated photograph.CC BY-NC-SA Schmidt Ocean Institute/Handout via REUTERS
Giant tubeworms on the seafloor surface at 2,500 meters water depth at the East Pacific Rise, a volcanically active ridge located where two tectonic plates meet on the floor of the Pacific Ocean in this undated photograph.CC BY-NC-SA Schmidt Ocean Institute/Handout via REUTERS
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Monkeys Who Recently Died in Hong Kong's Zoo Had Been Infected with Melioidosis

Giant tubeworms on the seafloor surface at 2,500 meters water depth at the East Pacific Rise, a volcanically active ridge located where two tectonic plates meet on the floor of the Pacific Ocean in this undated photograph.CC BY-NC-SA Schmidt Ocean Institute/Handout via REUTERS
Giant tubeworms on the seafloor surface at 2,500 meters water depth at the East Pacific Rise, a volcanically active ridge located where two tectonic plates meet on the floor of the Pacific Ocean in this undated photograph.CC BY-NC-SA Schmidt Ocean Institute/Handout via REUTERS

Nine monkeys who died in Hong Kong's oldest zoo in two days this week had been infected with an endemic disease, possibly after some digging work near their cages, officials said on Friday.

Secretary for Culture, Sports and Tourism Kevin Yeung said in a press briefing that the animals in the Hong Kong Zoological and Botanical Gardens contracted melioidosis and the disease later caused them to develop sepsis, according to The AP.

Yeung stressed that such infections typically occur through contact with contaminated soil and water and that there is generally no danger to humans from contact with infected animals or people.

“We're saddened by the passing of the nine monkeys,” he said.

Eight monkeys were found dead on Sunday, and another died Monday after displaying unusual behavior. The deceased animals were a De Brazza’s monkey, a common squirrel monkey, four white-faced sakis and three cotton-top tamarins — a species listed as critically endangered by the International Union for Conservation of Nature.

According to Hong Kong's Center for Health Protection, melioidosis is caused by the bacterium Burkholderia pseudomallei, which is widespread in soils and muddy water.

Yeung said the park conducted digging work to repair some irrigation pipes under the flower bed near the monkey cages in early October and that the deaths might be related to that.

He said the monkeys might have come into contact with the bacteria after the park's staff walked into their cages with possibly contaminated shoes. Another possibility is that some infected monkeys had close contact with other monkeys, he said.

“The incubation period for melioidosis in primates is about a week and this matched with the period after the soil digging work,” he said.

Edwin Tsui, the controller of the center, said the incident only happened in a single zone and its impact on Hong Kong residents would be very low.

Yeung on Monday held an urgent interdepartmental meeting about the deaths with the Leisure and Cultural Services Department, the Agriculture, Fisheries and Conservation Department and the Department of Health.

Another De Brazza’s monkey also displayed unusual behavior and appetite but offiicials said its condition remained stable on Friday.

The Hong Kong Zoological and Botanical Gardens — the oldest park in the former British colony — fully opened to the public in 1871. It is a rare urban oasis in the downtown Central district of the financial hub, which returned to Chinese rule in 1997.