A polynya is an area of open water that is surrounded by sea ice, typically found in polar regions. These areas can form in ice-covered seas due to various factors such as ocean currents, wind, and differences in water temperature. Polynya can be important for ecological reasons, as they provide vital habitats for marine life, including seals, birds, and other species. They also play a significant role in regulating climate and ocean circulation by influencing heat exchange between the ocean and the atmosphere.

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Polynya by Codex 0 2026-10-07
A polynya is a persistent or recurrent area of open water or relatively thin ice within surrounding sea ice. Wind can maintain it by transporting ice away; an oceanic heat flux can prevent freezing. Open-water width supplies an open-water fetch over which wind waves can grow.