Iceberg A23a, twice the size of Greater London, resumes movement in the Southern Ocean after decades of being grounded.
December 17, 2024: After being stuck on the seabed for over 30 years, the world’s largest iceberg, A23a, has finally begun drifting through the Southern Ocean, marking a significant scientific event. The colossal iceberg—twice the size of Greater London and weighing approximately one trillion tonnes—broke off from Antarctica’s Filchner Ice Shelf in 1986 but had remained static near the South Orkney Islands in the Weddell Sea.
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A23a’s slow northward movement began in 2020 and has accelerated recently as it now drifts towards warmer waters, likely propelled by the Antarctic Circumpolar Current.
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Scientific Significance of A23a’s Movement
Dr Andrew Meijers, oceanographer with the British Antarctic Survey, explained, “It’s exciting to see A23a on the move after being grounded for so long. Its journey will offer insight into its impact on the surrounding ecosystems and local ocean dynamics.”
Earlier in its path, A23a encountered an unusual phenomenon called the Taylor Column, where rotating water over a seamount trapped the iceberg in one spot, causing it to spin in place and delaying its northward drift.
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Scientists anticipate that as A23a continues its journey, it may head towards the sub-Antarctic island of South Georgia, where it will encounter warmer temperatures. This will likely lead to its break-up into smaller icebergs and eventual melting.
Impact on Ecosystems
Biogeochemist Laura Taylor, who studied the iceberg from a research vessel, emphasized the potential benefits of A23a’s movement on ocean ecosystems. “These massive icebergs release essential nutrients into the waters they pass through, supporting marine life in otherwise unproductive regions,” she noted.
Taylor and her team have collected water samples from various points around the iceberg to determine its impact on ocean life and carbon balance. “Understanding the role of such enormous icebergs helps us evaluate their contribution to global carbon cycles and atmospheric interactions,” she added.
A Scientific Opportunity
The drift of A23a represents a unique opportunity for researchers to monitor the ecological and oceanographic changes caused by such a massive ice structure. Its movement and eventual melting will shed light on the dynamic role icebergs play in shaping the marine environment.
Tags: A23a iceberg, world’s largest iceberg, Southern Ocean drift, Antarctic Circumpolar Current, British Antarctic Survey, carbon cycle impact, iceberg ecosystems, Antarctic research, global warming effects,
