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Sustainability Times

World’s Biggest Iceberg, A23a, Resumes Its Journey

Hina DinooHina DinooDecember 16, 2024 at 11:20 AM0
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The world’s largest iceberg, known as A23a, is once again on the move after being stuck for several months in the Southern Ocean. This colossal iceberg, which spans an impressive 3,672 square kilometers — slightly larger than the U.S. state of Rhode Island — has captured the attention of scientists and researchers worldwide.

A23a originally calved from the Filchner-Ronne Ice Shelf in 1986. For over three decades, it remained grounded on the seafloor of Antarctica’s Weddell Sea. Experts believe the iceberg’s mass and size kept it anchored to the seabed. However, as A23a gradually eroded, it eventually became small enough to break free from the seafloor’s grip. Ocean currents carried it away before it was trapped again in a Taylor column — a spinning vortex of water created when ocean currents collide with an underwater mountain.

After months of being immobilized, the iceberg has finally escaped the Taylor column’s grasp. Scientists now predict that ocean currents will continue to guide A23a toward warmer waters. Its journey is expected to take it near the remote island of South Georgia, where it will likely disintegrate into smaller fragments and melt.

A23a has held the title of the world’s largest iceberg on multiple occasions since the 1980s. It has been briefly surpassed by larger but shorter-lived icebergs, such as A68 in 2017 and A76 in 2021. While the breakaway of A23a is considered part of the natural life cycle of Antarctic ice shelves, climate change remains a significant concern. Scientists warn that rising global temperatures are accelerating ice shelf disintegration, which poses a threat to sea levels worldwide.

The movement of massive icebergs like A23a offers scientists an opportunity to study the impact of icebergs on marine ecosystems. Researchers from the British Antarctic Survey (BAS) have closely monitored A23a’s journey, collecting samples from the surrounding waters. They are particularly interested in how icebergs influence the distribution of carbon and nutrients in the ocean.

Biogeochemist Laura Taylor, who has studied the waters around A23a, emphasized the ecological significance of these drifting ice giants. “We know that these giant icebergs can provide nutrients to the waters they pass through, creating thriving ecosystems in otherwise less productive areas,” Taylor explained. “What we don’t know is what difference particular icebergs, their scale, and their origins can make to that process.”

To better understand the iceberg’s ecological impact, Taylor’s team collected water samples from three key locations: behind, beside, and ahead of A23a’s route. These samples will help determine how the iceberg’s presence affects marine life, carbon cycling, and the balance of gases between the ocean and the atmosphere.

The fate of A23a is being closely watched by the global scientific community. As it drifts toward warmer waters, its eventual breakup could provide further insights into the role of icebergs in ocean ecology and the broader implications of climate change on Antarctic ice shelves. For now, A23a’s renewed movement serves as a reminder of the dynamic and ever-changing nature of the world’s polar regions.

 

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Hina Dinoo
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Hina Dinoo is a Toronto-based journalist at Sustainability Times, covering the intersection of science, economics, and environmental change. With a degree from Toronto Metropolitan University’s School of Journalism, she translates complexity into clarity. Her work focuses on how systems — ecological, financial, and social — shape our sustainable future. Contact: [email protected]

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