A massive iceberg, measuring nearly 2 trillion tonnes, has finally come to a standstill off the coast of South Georgia Island in the sub-Antarctic region. The giant A23a broke off from Antarctica’s Filchner Ice Shelf in 2000 and has been drifting through the Southern Ocean since then.
Researchers from British Antarctic Survey (BAS) have been tracking the iceberg’s progress using satellite data, observing its shape and movement over time. They note that while the berg is large, it is easily avoidable by shipping operators, who are aware of the dangers posed by icebergs in the area.
However, as A23a breaks up over time, smaller bergs will become more difficult to track, potentially leading to increased risks for fishing operations and shipping. BAS researchers have already taken samples from around the iceberg to study its impact on ocean biogeochemistry and phytoplankton growth.
The history of this massive iceberg is linked to global warming, as observations show that Antarctic ice shelves have lost around 6,000 billion tonnes of mass since 2000. This loss is attributed to anthropogenic climate change, which has significant implications for ocean circulation, sea level rise, and potential irreversible “tipping points” in the vulnerable West Antarctica region.
While A23a’s presence may pose some risks to wildlife, particularly South Georgia seals and penguins, it is unlikely to have a direct impact on their populations. However, if the berg stimulates ocean productivity, it could potentially boost local predator populations. As A23a breaks up, researchers will continue to monitor its progress and study its effects on the surrounding environment.
Source: https://www.bas.ac.uk/media-post/worlds-largest-iceberg-grounds-near-sub-antarctic-island-of-south-georgia