Arctic sea ice has reached an unprecedented low following unusually high temperatures in two critical regions, according to Japan’s National Institute of Polar Research (NIPR). The Arctic’s annual peak ice coverage—typically at its fullest during winter—has shrunk to its smallest size since satellite tracking began in 1979. At its maximum on March 13, the ice spanned 5.31 million square miles (13.76 million square kilometers), slightly lower than the previous record set in March 2025, which was already six percent below the 1991-2010 average. This year, the ice sheet was 11,580 square miles (30,000 square kilometers) smaller than the 2025 record.
Unusual Failure of Arctic Sea Ice to Expand in Winter
Scientists attribute this decline to unusually warm conditions in the Sea of Okhotsk near Russia and Baffin Bay off Canada’s northern coast, areas where ice struggled to form. NIPR cautions, “There are concerns that changes in Arctic sea ice may reach a critical point amid ongoing global warming, potentially triggering widespread impacts on the global climate system.” Typically, Arctic sea ice grows during the Northern Hemisphere’s winter months, expanding between October and March, then melting from April to September. However, during the winter of 2025 to 2026, the ice extent remained worryingly low throughout the season.
Satellite Evidence of Record-Low Arctic Ice Maximum
Data from the Japanese Space Agency’s SHIZUKU satellite confirmed this record-low ice extent in March. Comparing this to the 2010 average highlights the severity of the situation, with the ice boundary retreating miles further back in March 2026, especially in the Sea of Okhotsk and Baffin Bay. Further analysis indicated that these regions experienced persistently higher-than-normal temperatures from January to February, significantly impeding ice formation. Moreover, in the Sea of Okhotsk, strong southeasterly winds and warm water led to a reduction in ice extent as early as February 19.
This comes as scientists continue to warn that the warming climate is threatening the existence of sea ice in the Arctic ocean. Previous studies have suggested that the first year in which the sea ice completely vanishes in summer could come as soon as next year. Using 300 computer simulations, scientists predicted that the Arctic’s first ice–free day is guaranteed to occur within nine to 20 years , regardless of how humans alter their greenhouse gas emissions. However, nine out of the 300 simulations suggested that an ice–free day could occur by 2027, regardless of how humans act. Separate research conducted by the University of Exeter last year found that the Arctic has actually been melting at a slower rate for the past 20 years. From 1979 to 2024, ice was lost from the Arctic at a rate of 2.9 million cubic kilometres of ice per decade. But from 2010 to 2024, the rate had reduced to just 0.4 million cubic kilometres per decade – seven times smaller. But this is not necessarily good news, as the scientists say this temporary slowdown will probably only continue for five to 10 years.
When this period ends, it’s likely to be followed by ‘faster–than–average’ sea ice decline. Sea ice is already floating on the ocean, so its melting doesn’t directly affect global sea levels. However, the ice plays a key role in regulating the temperature of the atmosphere and oceans. NIPR says: ‘Sea ice is a critical component of the climate system; its fluctuations can impact extreme weather patterns and marine environments.’ Without a cover of reflective ice, the Arctic oceans would absorb significantly more energy from the sun. That risks destabilising the balance of global weather systems and raising sea levels as the warmer water expands. Dr Céline Heuzé, of the University of Gothenburg, previously told the Daily Mail that this would ’cause more extreme weather, year–round.’ Dr Heuzé added: ‘Think of the cold spells with –20° (–4°F) down to Italy, or the heatwaves over northern Europe and forest fires throughout Scandinavia.’
