Perennial Arctic Sea Ice Decline 1984 – 2016 (4K)

Animation of Arctic sea ice between 1984 and 2016 showing the rapid decline in perennial sea ice. Perennial sea ice (or multi-year ice) is the portion of the sea ice that survives the summer melt season, may have a life-span of nine years or more, and can grow up to four meters thick. Credit: NASA Scientific Visualization Studio