Bellingshausen Sea Misses Winter Ice: France-Sized Gap Raises Ecological and Sea-Level Concerns

Satellite images from early June 2026 show the Bellingshausen Sea, off West Antarctica, largely ice-free, missing about 650,000 sq km of winter sea ice—an area comparable to France. Continental ice extent on 10 June was 11.4 million sq km, versus the 12.6 million sq km average. At Argentina’s Esperanza base on the Antarctic Peninsula, temperatures reached 15.4 °C, over 20 °C above the usual June maximum of –6.2 °C.

Antarctica sea ice loss: France-sized gap alarms scientistsBulletin of Atomic ScientistsABC News AustraliaAntarctica’s west coast is missing an area of sea ice larger than state of California, and it spells doom for an entire ecosystem

Winter sea ice underpins the Antarctic food web by sheltering krill, the main prey of emperor and Adelie penguins, crabeater seals, whales and fish. Without the ice platform, krill lose refuge, penguins face longer foraging trips and lower breeding success, and seals must travel farther. The ice-free coast also removes a buffer protecting the Pine Island and Thwaites ice shelves, raising the risk of accelerated glacier discharge and sea-level rise.

Antarctica sea ice loss: France-sized gap alarms scientistsAntarctica’s west coast is missing an area of sea ice larger than state of California, and it spells doom for an entire ecosystemBulletin of Atomic Scientists

Will Hobbs of the University of Tasmania warned that “the warm ocean conditions likely will not support very much winter sea ice” and that only a modest amount might appear later, adding “we’re not going to see a whole lot form there anymore.” Edward Doddridge of the Institute for Marine and Antarctic Studies said “warmer ocean temperatures—especially in the 100-metre to 300-metre depth range—have a really big impact on sea ice,” while noting more evidence is needed. Argentina’s Servicio Meteorológico Nacional confirmed the extreme temperature spike at Esperanza base.

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Scientists caution against attributing the loss solely to global warming. Edward Doddridge noted that “when we say something is directly caused by something we want to have all of the evidence… we don’t yet have the smoking gun that can link those temperatures to the sea-ice loss.” Other researchers point to wind-driven ice export, freshwater input and atmospheric circulation as additional drivers. Direct measurements of subsurface temperatures in the 100-300 m layer are lacking, leaving a key data gap.

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• “It is concerning, absolutely.” — Will Hobbs, University of Tasmania

Bulletin of Atomic Scientists

• “I’m concerned. It’s depressing.” — Will Hobbs, University of Tasmania

Bulletin of Atomic Scientists

• “Sea ice is forming too late and breaking up too early. It leads to reduced breeding success and longer trips to molting grounds.” — Peter Fretwell, British Antarctic Survey

Bulletin of Atomic Scientists

• “If the protective sea ice remains absent for longer periods, those shelves are much more likely to break up.” — Phil Reid, Bureau of Meteorology

Antarctica’s west coast is missing an area of sea ice larger than state of California, and it spells doom for an entire ecosystem

Researchers will track any late-forming ice through July-September and conduct ocean-temperature profiling to test the warming-water hypothesis. Continued satellite and field observations will determine whether the Bellingshausen Sea’s ice deficit persists, potentially establishing it as an early indicator of broader Antarctic change.

Antarctica sea ice loss: France-sized gap alarms scientists