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Perennial Ice In The Arctic Has Declined - NOAA Video
Since the 1980s, the amount of perennial ice in the Arctic has declined as this animation shows.

This animation tracks the relative amount of ice of different ages from 1987 through early November 2014. The oldest ice is white; the youngest (seasonal) ice is dark blue. Key patterns are the export of ice from the Arctic through Fram Strait and the melting of old ice as it passes through the warm waters of the Beaufort Sea.
Animation courtesy: NOAA Climate.gov team, based on research data provided by Mark Tschudi, CCAR, University of Colorado. Sea ice age is estimated by tracking of ice parcels using satellite imagery and drifting ocean buoys.

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