Movie of Arctic sea ice imaged from space over the last month.

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Sea ice is shown by shades of grey:
light grey: predominantly multi-year ice (which has survived at least one summer)
darker grey: predominantly first-year ice

These data were provided by http://www.icemap.net/ based on data from the NASA Physical Oceanography Distributed Active Archive Center at the Jet Propulsion Laboratory, California Institute of Technology. IceMap.net is the web-portal for a consortium of companies that provide ice monitoring services for offshore operators.