NASA · Space

Arctic Sea Ice Reaches 2026 Annual Minimum Extent

Arctic sea ice reached its annual minimum extent on September 12, 2026, covering an estimated 1.78 million square miles. This ties for the 10th-lowest minimum in the satellite record, which began in late 1978.

The 2026 minimum is consistent with recent trends, as the past 20 years (2007-2026) have seen the 20 lowest annual Arctic sea ice minimum extents. While sea ice grows in winter and retreats in summer, weather conditions cause year-to-year variations. Increased cloud cover in the last decade has limited solar radiation, contributing to relatively stable September extents, though still low compared to earlier records.

Meanwhile, Antarctic sea ice is approaching its annual maximum. It experienced an unusual, rapid decline of approximately 116,000 square miles over six days in August before resuming seasonal growth. Scientists attribute this fluctuation to weather conditions compacting the thin, mobile ice at the edge.

Antarctic sea ice exhibits greater year-to-year variability than Arctic sea ice due to its open ocean environment, allowing it to respond more freely to wind and weather. Despite this variability, its annual maximum extent has generally been lower in recent years. Scientists remain cautious about characterizing this as a long-term trend.

Continuous satellite monitoring of polar sea ice has been ongoing for nearly five decades, utilizing instruments from NASA and NOAA, including Nimbus-7, DMSP satellites, Aqua, and currently the AMSR2 aboard JAXA's GCOM-W satellite.

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