Antarctica's West Coast Sea Ice Loss Sparks Concerns

The Alarming Loss of Sea Ice

Antarctica's west coast is missing an area of winter sea ice the size of France, sparking concerns for threatened penguins, other marine life, and global sea levels. The loss of ice in the Bellingshausen Sea is 'depressing' and may have intensified a heatwave over the continent's peninsula last week that saw daytime temperatures peak at 15.4C, more than 20C above average.

Understanding the Impact of Sea Ice Loss

Scientists said the region was missing about 650,000 sq kilometres (250,000 sq miles) of sea ice, compared with the average between 1991 and 2020. This is an area about the size of France and almost 10 times the size of Tasmania. The loss of sea ice is likely linked to changes in the ocean, and scientists are trying to understand if global heating is a factor.

The Consequences for Marine Life

The region is important for krill – a critical part of the food web for species in the region. Krill would usually be hiding from predators under the ice in winter, where they graze on algae. The loss of sea ice is a serious problem for penguins, especially emperors, as it leads to reduced breeding success and longer trips to moulting grounds.

The Future Outlook

Dr Phil Reid, who monitors Antarctic conditions at Australia's Bureau of Meteorology, said the Bellingshausen Sea had seen 'incredible coastal exposure' in winter and summer in recent years. He warned that the loss of protective sea ice could speed up the loss of ice from the glaciers, pushing up global sea levels in the future.