World’s Largest Iceberg Resumes Northern Movement After Vortex Release

The planet’s largest iceberg, designated A23a, has recommenced its movement after spending the majority of the year caught in a rotating water column. This colossal iceberg measures 3,800 sq km (1,500 sq miles), exceeding twice the area of Greater London, and boasts a thickness of 400m (1,312ft). Although it separated from Antarctica in 1986, it subsequently became grounded near the coastline. Due to its considerable depth, the iceberg’s base became embedded on the seabed of the Weddell Sea, an arm of the Southern Ocean, where it stayed stationary for over three decades. Its northward progression commenced in 2020; however, since the spring, it had been rotating in place after encountering a swirling body of water close to the South Orkney Islands. The British Antarctic Survey (BAS) announced on Friday that the iceberg is now continuing its drift in a northerly direction. Dr Andrew Meijers, an oceanographer affiliated with the BAS, commented: “It’s exciting to see A23a on the move again after periods of being stuck.” He added: “We are interested to see if it will take the same route the other large icebergs that have calved off Antarctica have taken.” It is anticipated that A23a will ultimately exit the Southern Ocean and proceed into the Atlantic Ocean. There, it is expected to encounter elevated water temperatures, which will probably cause it to fragment into smaller icebergs and eventually disintegrate. Dr Meijers and the BAS are currently investigating the effects of icebergs on indigenous ecosystems following their transit through these areas. Approximately one year prior, scientists aboard the RRS Sir David Attenborough gathered information from the aquatic environment surrounding A23a. Laura Taylor, a biogeochemist who was a member of the expedition team, stated: “We know that these giant icebergs can provide nutrients to the waters they pass through, creating thriving ecosystems in otherwise less productive areas.” She further noted: “What we don’t know is what difference particular icebergs, their scale, and their origins can make to that process.” Copyright 2024 BBC. All rights reserved. The BBC bears no responsibility for the material found on external websites. Information regarding our policy on external linking is available.