The Bellingshausen Sea, spanning 650,000 square kilometers, is currently missing sea ice compared to the 1991–2010 average, as shown in satellite imagery. Antarctica's west coast is devoid of winter sea ice equivalent to the size of France, alarming scientists about the fate of threatened penguins, marine life, and global sea levels. One expert described the ice loss in the Bellingshausen Sea as 'depressing,' noting that the failure of ice formation may have exacerbated a heatwave on the Antarctic peninsula last week, where daytime temperatures reached 15.4°C—more than 20°C above average.
Winter Sea Ice Absence
During Antarctica's winter, sea ice typically expands rapidly around the continent, peaking in September. However, satellite observations reveal that the Bellingshausen Sea, located on the western side of the Antarctic peninsula and usually ice-covered by June, is now almost completely ice-free. Scientists report that the region is missing approximately 650,000 square kilometers (250,000 square miles) of sea ice compared to the 1991–2020 average—an area roughly the size of France and nearly ten times that of Tasmania.
Dr. Will Hobbs, an Antarctic sea ice expert at the University of Tasmania and part of the Australian Antarctic Program Partnership, expressed concern: 'I'm concerned. It's depressing. It is remarkable that we are in June and there is no sea ice there.' He noted this is the third time in four years that sea ice has been extremely low in the region, adding, 'I don't think we will see sea ice there any more. It's done.' The loss is likely linked to ocean changes, and scientists are investigating whether global heating plays a role.
Impact on Krill and Food Web
The Bellingshausen Sea is crucial for krill, a cornerstone of the regional food web. During winter, krill typically hide from predators beneath the ice, grazing on algae. The absence of ice threatens this vital species.
As of June 10, sea ice around the entire continent measured about 11.4 million square kilometers, compared to the long-term average of 12.6 million square kilometers for that date. Dr. Phil Reid, who monitors Antarctic conditions at Australia's Bureau of Meteorology, noted that the Bellingshausen Sea has experienced 'incredible coastal exposure' in both winter and summer recently. To the west lie the Pine Island and Thwaites glaciers, major contributors to ice loss and sea level rise. Floating ice shelves in front of these glaciers could disintegrate faster if protective sea ice is absent for longer periods, potentially accelerating glacier ice loss and raising global sea levels.
Penguin Breeding Failures
The Bellingshausen Sea coastline witnessed tragedy in late 2022 when thousands of emperor penguin chicks died in a 'catastrophic breeding failure' across four colonies. This event contributed to UN advisers upgrading the species to 'endangered' on the international threatened species list earlier this year. Dr. Peter Fretwell, a scientist at the British Antarctic Survey tracking penguin decline, stated that the current sea ice loss is 'a serious problem for penguins, especially emperors. Sea ice is forming too late and breaking up too early. It leads to reduced breeding success and longer trips to moulting grounds.' Adelie penguin numbers are also falling, and crabeater seals are forced to migrate in summer to find stable ice.
Heatwave Intensified by Ice Loss
This month, the Antarctic peninsula experienced an extreme temperature spike over several days. Hobbs said that while 'nobody has done the numbers,' it is reasonable to suggest the heatwave was 'made worse by the lack of sea ice,' as sea ice usually cools any warmer airflow from the north. Officials from Argentina's national weather service, Servicio Meteorológico Nacional, reported that the country's Esperanza base at the peninsula's northeastern tip endured an 'extreme temperature event' peaking on June 5 and 6. Maximum temperatures of 15.4°C and 13.4°C were recorded, compared to average daily maximums of -6.2°C. The previous June temperature record at the base was 13.3°C, set on June 12, 1998.
