Antarctic scientists are currently conducting an extraordinary examination of A23a, the world’s largest iceberg, which is approximately three times the size of New York City and had been stranded for nearly 40 years. This massive iceberg, known as A23a, originated from an ice shelf in West Antarctica, south of Chile, and separated in 1986. It had been stuck to the ocean floor since then.
However, recent satellite imagery confirmed that A23a is no longer grounded and has begun drifting towards an area known as “iceberg alley,” on a course that would take it to the sub-Antarctic island of South Georgia.
The British Antarctic Survey (BAS) used this opportunity to inspect the iceberg in person. Aboard the RRS Sir David Attenborough, a research vessel designed for polar conditions, British scientists have been able to closely examine A23a. The iceberg measures around 4,000 sq km (1,500 square miles), making it more than twice the size of Greater London and nearly twice as large as the Australian Capital Territory.
This rare encounter occurred while the research vessel was heading south to investigate the influence of Antarctic ecosystems on the ocean’s carbon and nutrient cycles. Dr. Andrew Meijers, the chief scientist on the ship, described the opportunity as “incredibly lucky” and credited the team’s readiness to seize the moment.
The exploration of A23a provides a unique opportunity for scientists to study the iceberg’s physical characteristics, as well as its potential impact on local ecosystems and ocean currents as it continues its journey through the Southern Ocean.