The Cryosphere, 1 April 2026
Antarctic sea ice stayed fairly steady from 2010-2014, but began to drop sharply after 2015. By February 2023, it reached a record summer low of 1.85 million km², about 20% lower than the 2010-2014 average. The largest losses have been in the Amundsen-Bellingshausen Sea and around the Antarctic Peninsula. This decline happened alongside a clear rise in extreme weather. Heat waves were about 400% more common in 2021-2023 compared with 2010-2014, while cold waves increased by around 700%. Together, these changes suggest strong links between sea ice conditions and extreme weather. These shifts are likely connected to large climate patterns such as the El Niño–Southern Oscillation (ENSO), a cycle of warming and cooling in the Pacific Ocean that influences weather worldwide, and the Southern Annular Mode (SAM), which affects wind patterns around Antarctica. Overall, the results suggest that Antarctic sea ice loss is increasingly tied to more frequent and intense extreme weather, highlighting the need for improved forecasting.
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