The Bellingshausen Sea, covering 650,000 square kilometers, is currently missing an area of sea ice the size of France compared to the 1991–2010 average. This alarming loss has raised concerns for threatened penguins, other marine life, and global sea levels.
Unprecedented Ice Loss
Antarctica's west coast is missing an expanse of winter sea ice equivalent to the size of France. One expert described the ice loss in the Bellingshausen Sea as "depressing," noting that the failure of ice to form may have intensified a recent heatwave over the continent's peninsula, where daytime temperatures peaked at 15.4°C—more than 20°C above average.
During winter in Antarctica, sea ice typically expands rapidly, peaking in September. However, satellite observations reveal that the Bellingshausen Sea, located on the west side of the Antarctic Peninsula, remained almost completely ice-free in June, when it would normally be covered.
Expert Concerns
Scientists estimate the region is missing about 650,000 square kilometers (250,000 square miles) of sea ice compared to the average between 1991 and 2020. This area is roughly the size of France and nearly ten times the size of Tasmania.
"I'm concerned. It's depressing," said Dr. Will Hobbs, an Antarctic sea ice expert at the University of Tasmania with the Australian Antarctic Program Partnership. "It is remarkable that we are in June and there is no sea ice there."
This marks the third time in four years that sea ice has been extremely low in the region. Hobbs added, "I don't think we will see sea ice there any more. It's done." He explained that the loss is likely linked to changes in the ocean, and scientists are investigating whether global heating is a contributing factor.
Impact on Ecosystem
The region is critical for krill, a foundational species in the food web. Krill typically hide from predators under the ice during winter, grazing on algae. The absence of ice threatens their survival.
On June 10, sea ice coverage around Antarctica was approximately 11.4 million square kilometers, compared to the long-term average of 12.6 million square kilometers for that date.
Glacier and Sea Level Risks
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 in recent years. 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 break up faster if protective sea ice is absent for longer periods, potentially accelerating ice loss from the glaciers and raising global sea levels.
Penguin Populations at Risk
The Bellingshausen Sea coastline witnessed tragedy in late 2022 when thousands of emperor penguin chicks died during a "catastrophic breeding failure" in four colonies. This event contributed to the species being reclassified as "endangered" on the international threatened species list earlier this year.
Dr. Peter Fretwell, a scientist at the British Antarctic Survey who has documented penguin declines, stated that the current loss of sea ice is "a serious problem for penguins, especially emperors." He added, "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 being forced to migrate in summer to find stable ice.
Heatwave Connection
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," which would typically help cool warmer airflows from the north.
Argentina's national weather service reported that the Esperanza base at the peninsula's northeastern tip experienced an "extreme temperature event" peaking on June 5 and 6, with maximum temperatures of 15.4°C and 13.4°C, compared to average daily maximums of -6.2°C. The previous June record at the base was 13.3°C on June 12, 1998.
