Antarctica's West Coast Missing Sea Ice Area the Size of France as Temperatures Soar
Argentina's Esperanza base on the Antarctic Peninsula recorded a winter temperature of 15.4°C on June 6, shattering the previous record by 2°C and sitting roughly 20°C above seasonal norms. The heatwave coincides with a near-total absence of sea ice in the Bellingshausen Sea, where an area roughly the size of France — about 650,000 square kilometres — has failed to form. Scientists warn the combined conditions threaten emperor penguin breeding, krill populations, and could accelerate ice loss from the Pine Island and Thwaites glaciers, with implications for global sea levels.
During what should be the height of Antarctic winter, the Esperanza research base logged a peak temperature of 15.4°C on June 6, breaking the station's previous June record of 13.3°C set in 1998 and exceeding seasonal averages by approximately 20°C. Two other Argentine stations, Marambio and San Martin, also set records in the same period, while Chilean glaciologist Luis Muñoz reported rain — rather than snow — falling at the 500-metre summit of the Collins glacier on King George Island, causing active ice ablation at a time of year when accumulation is expected. Satellite data from the National Snow and Ice Data Center shows the Bellingshausen Sea, on the western side of the Antarctic Peninsula, is almost completely ice-free, with roughly 650,000 sq km of sea ice absent compared to the 1991–2020 average — the third such episode in four years. Dr Will Hobbs of the University of Tasmania described the situation as 'depressing' and said he no longer expects sea ice to reliably return to the region. The absence of sea ice removes a buffer that normally moderates warm air flowing in from the north, potentially intensifying heatwaves, and also exposes the coastlines near the Pine Island and Thwaites glaciers, whose floating ice shelves could destabilise more rapidly without protective sea ice. Emperor penguin colonies in the Bellingshausen region have already suffered catastrophic breeding failures linked to sea ice loss, and scientists note that krill — a keystone species for whales, penguins, and seals — depend on under-ice algae during winter. Climate scientists stress that the Antarctic Peninsula has warmed roughly five times faster than the global average since 1950, and that feedback loops between ice loss and ocean heat absorption are accelerating the trend.
Limitations & open questions
None of the sources quantify the specific atmospheric or oceanic mechanisms — such as the precise role of blocking high-pressure systems or anomalous sea surface temperatures — that drove this particular heatwave event, nor do they provide formal attribution analysis linking it to anthropogenic climate change, which would strengthen or qualify the causal claims being made.
How coverage differed
The Guardian led with the sea ice deficit and ecological consequences, giving prominent space to expert alarm and specific wildlife impacts, while Gizmodo and Euronews foregrounded the temperature record and heatwave drama; all three outlets framed the events as evidence of accelerating climate change, but The Guardian provided the most granular scientific sourcing whereas Gizmodo and Euronews relied more heavily on The Guardian's own reporting as a secondary reference.
What different sources said
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