Antarctic sea ice recorded its third-smallest winter peak extent in the 48-year satellite record, reaching 17.59 million square kilometers on 14 September, according to provisional data from the US National Snow and Ice Data Center. The measurement marks a continuation of unusually low ice coverage in the Southern Hemisphere, though data providers note that large fluctuations near the seasonal maximum are typical for Antarctic sea ice.
Polar climate researchers described the Antarctic readings as concerning given the region’s historical stability. Dr Lettie Roach of the Alfred Wegener Institute stated that Antarctic sea ice extent this year was substantially below seasonal averages, noting that persistent low values represent a departure from decades of stable or increasing winter conditions. However, scientists emphasized the need for additional observations to determine whether these measurements indicate a fundamental change in Antarctic sea ice behavior or reflect natural climate variability. Dr Clare Eayrs of the Korea Polar Research Institute noted that July and August extents this year ranked among the lowest on record, with particularly low measurements in July and August.
Regional ice patterns shifted notably during the growth season, with the Bellingshausen Sea remaining ice-free in April while the Amundsen Sea had above-average coverage. By late August, atmospheric pressure and wind changes had reversed these patterns, with the Bellingshausen Sea recovering and the Amundsen Sea and East Antarctica experiencing unusually low ice extent.
At the Arctic, sea ice reached its annual minimum extent of 4.60 million square kilometers on 12 September, tying 2025, 2010, and 2008 for the 10th-lowest measurement in satellite records. While not record-setting, this minimum remains lower than any Arctic minimum recorded before 2007. Scientists attributed regional variations to local weather patterns, with central Arctic conditions bringing cloudier, cooler weather that slowed surface melt, while the Atlantic side experienced extreme conditions with record-early ice melt-out in the Barents Sea linked to unusually warm air and ocean temperatures.
Research capabilities faced disruption when the National Oceanographic and Atmospheric Administration terminated a global air pressure dataset in March that scientists had relied upon for Arctic sea ice thickness analysis. The termination forced suspension of updates to the Pan-Arctic Ice Ocean Modeling and Assimilation System reanalysis, with researchers noting they require considerable effort to locate alternative data sources to resume production of updated measurements.
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