Giant Ice-Free Zone Emerges in East Antarctica Amid Unusual Weather Patterns
Scientists observed a massive open-water area forming in the Breid Bay region of East Antarctica during the 2024 winter, driven by a combination of atmospheric rivers and oceanic processes.
During the Antarctic winter of 2024, a substantial ice-free patch appeared in the Breid Bay area of East Antarctica, an unexpected development in a zone that usually remains ice-covered throughout July and August. Analysis of satellite data showed the open water area spanning tens of thousands of square kilometres. The phenomenon resulted from multiple atmospheric rivers that introduced warm, moisture-laden air, elevating atmospheric temperatures and increasing precipitation.
Concurrently, vigorous winds triggered Ekman suction, lifting warmer deep-water toward the surface, and a concurrent marine heat wave eroded the fragile ice sheet. The combined atmospheric and oceanic forces prevented new sea ice from forming and weakened the existing cover, creating a large polynya that could affect regional sea-ice protection and Antarctic ecosystems.
Why it matters
The event shows how combined atmospheric and oceanic changes can rapidly alter Antarctic sea-ice, with implications for global climate and marine habitats.
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