This spring, a larger fraction of sea ice in the Arctic is much thinner than average, a sign that the ice may be more likely to melt this summer. Light orange areas are covered by brand-new, first-year ice, which typically is less than two meters thick. Darker orange and red areas are covered by multiyear ice, which usually measures three meters or more thick.
Credit: National Snow and Ice Data Center, courtesy of J. Maslanik and C. Fowler/Univ. of Colorado
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