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Sea ice age from 1987 through end of October 2013. Age class 1 means “first-year ice,” which is ice that formed in the most recent winter. The oldest ice (9+) is ice that is more than 9 years old.  Animation by NOAA climate.gov, based on research data provided by Mark Tschudi, CCAR, University of Colorado.

Video Credit: 
NOAA Climate.gov
Mark Tschudi
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