Giant antarctic iceberg a23a begins drifting after decades

ANTARCTICA – Scientists reported on Friday that A23a, the world’s largest iceberg, has started moving for the first time in over 30 years. This Antarctic iceberg, spanning nearly 4,000 square kilometers, is about three times the size of New York City.

A23a broke away from West Antarctica’s Filchner-Ronne Ice Shelf in 1986. It remained mostly stationary, its base wedged on the seabed of the Weddell Sea. This iceberg once supported a Soviet research station.

Recent satellite imagery shows that A23a, weighing close to a trillion metric tonnes, is now rapidly drifting past the northern tip of the Antarctic Peninsula. This movement is driven by strong winds and ocean currents, marking a rare event in glacial dynamics.

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