[REVISION HISTORY]

Arctic and Antarctic sea ice extent and trends

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2026-10-18 13:38 UTC → 2026-10-25 16:44 UTC · added ~~removed~~

Discussions regarding Arctic sea ice have centered on the accuracy of historical climate predictions and current measurement trends. Critics have pointed to past forecasts suggesting that the Arctic would be ice-free during summer months by years such as 2007, 2012, 2016, and 2020, noting that these predictions did not materialize. On September 12, 2026, Arctic sea ice reached its annual minimum extent of approximately 4.6 million square kilometers (1.78 million square miles). Data from NASA and the National Snow and Ice Data Center (NSIDC) indicate this figure ties with minimums recorded in 2008, 2010, and 2025, marking the 10th-lowest extent in the satellite record. This 2026 minimum is 1.62 million square kilometers below the 1981-2010 average. Satellite observations reveal a long-term decline in ice thickness and extent, with every summer from 2007 through 2026 ranking among the 20 lowest September extents on record. While the melt season has lengthened by approximately 40 days compared to 1979, researchers from NASA note that the duration of this melt season has remained relatively steady since around 2010. This stabilization is attributed to changing cloud patterns and increasingly thin ice. ~~Scientists observe that the~~ The primary driver of the extended melt season has been later freeze-ups in the fall rather than earlier spring ~~melts, and that the loss of multiyear ice has led to increased variability in seasonal ice conditions.~~ melts. In ~~addition to Arctic trends, Antarctic~~ the Antarctic, the sea ice ~~has~~ reached its annual maximum ~~at its third-lowest level~~ on ~~record. The ice cover peaked on~~ September 14 at 17.59 million square kilometers, which is the third-lowest level on record and roughly one million square kilometers below the long-term average. ~~Satellite imagery from~~ Scientists note that the ~~Copernicus Sentinel-3 mission captured on September 30 shows~~ four lowest winter sea ice ~~spreading to the tip of the Antarctic Peninsula and covering parts of~~ maximums on record have all occurred within the ~~Weddell Sea.~~ last four years.

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