Thickest sea ice

Last updated: October 22, 2017 at 4:21 am

Multiyear (perennial) ice in the Arctic Ocean can reach more than 4 m (13 ft) thick with ridges up to 20 m (66 ft) thick. First-year ice that grows over a single winter may reach a maximum thickness of about 2 m (6.6 ft).

Canadian Ice Service
NASA Earth Observatory

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