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Long-term (declining) trends in sea ice are mostly found in the outer regions of the #Arctic Ocean during December (and all winter). The remaining area still becomes ice-covered.

Sea ice concentration = fraction of ice-cover. More info https://doi.org/10.1175/BAMS-D-25-0104.1. Data https://www.ncei.noaa.gov/products/climate-data-records/sea-ice-concentration

National Centers for Environmental Information (NCEI)

Sea Ice Concentration CDR

The Arctic

Polar stereographic map showing Arctic sea ice concentration trends for Decembers from 1979 to 2024. Red shading is shown for deceasing sea ice, and blue shading is shown for increasing sea ice. Trends are calculated in % per decade. All areas are observing decreasing sea ice in the outer edges of the Arctic Ocean.

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