In a noteworthy development, scientists report that the world’s largest iceberg, A23a, spanning almost 4,000 square kilometers and roughly three times the size of New York City, is on the move for the first time in over three decades. Initially calving off West Antarctica’s Filchner-Ronne Ice Shelf in 1986, the colossal iceberg, which once housed a Soviet research station, had been largely stationary after its base became lodged on the floor of the Weddell Sea.
Recent satellite imagery reveals that A23a, weighing nearly a trillion tonnes, is now rapidly drifting past the northern tip of the Antarctic peninsula, propelled by strong winds and currents. British Antarctic Survey glaciologist Oliver Marsh notes that such movement for an iceberg of this magnitude is a rare occurrence, prompting close monitoring by scientists.
As the colossal iceberg gains momentum, it is anticipated to enter the Antarctic circumpolar current, directing it toward the Southern Ocean along the renowned “iceberg alley,” where others of its kind are commonly found floating in dark waters.
The reason behind the sudden movement remains unclear. Marsh suggests that over time, A23a may have slightly thinned, gaining the extra buoyancy needed to lift off the ocean floor and be propelled by ocean currents. Remarkably, A23a is also recognized as one of the world’s oldest icebergs.
There is a possibility that A23a could re-ground at South Georgia island, potentially posing challenges for Antarctica’s wildlife. The island serves as a breeding and foraging ground for millions of seals, penguins, and seabirds.
By Reuters
