Arctic sea ice reached its annual low point on September 12, covering 1.78 million square miles (4.6 million square kilometers). This measurement ties with 2008, 2010, and 2025 as the 10th-lowest minimum recorded since satellite observations began in 1978. The data, provided by NASA and the National Snow and Ice Data Center (NSIDC), confirms that the 20 lowest minimums in the satellite record have all occurred within the last two decades.

While the Arctic ice extent has remained relatively stable in recent years, experts note that current levels are still significantly lower than those seen earlier in the satellite record. Linette Boisvert, a NASA Goddard Space Flight Center scientist, attributed this recent stability in part to increased cloud cover, which has shielded the ice from intense solar radiation. Walt Meier, a senior research scientist at NSIDC, described the current state as a plateau, noting that the region remains at a low point compared to historical data.

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Meanwhile, in the Southern Hemisphere, Antarctic sea ice is currently nearing its annual maximum. Researchers observed a notable fluctuation in August, where ice extent dropped by approximately 116,000 square miles (300,000 square kilometers) over six days before growth resumed. Meier characterized the magnitude of this decline as unusual, though he noted it was likely driven by weather patterns compacting the mobile ice. Unlike the Arctic, Antarctic ice is not constrained by surrounding land, leading to higher year-to-year variability that makes identifying long-term trends more complex.

Polar monitoring has relied on a continuous stream of satellite data for nearly 50 years, beginning with the Nimbus-7 mission in 1978. Current observations are maintained using the Advanced Microwave Scanning Radiometer 2 (AMSR2) instrument. NASA and the NSIDC expect to release the final 2026 Antarctic maximum figures once seasonal growth concludes, typically occurring in late September or early October.

Source: NASA