Observed and projected Arctic September sea-ice extent 1900-2100

Figure expired Created 12 Nov 2009 Published 12 Nov 2009 Last modified 26 Aug 2017
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Note: The retreat of the sea ice has been faster than predicted: Arctic September sea-ice extent from observations (thick orange line) together with the mean value (solid grey line) from 13 IPCC AR4 climate models and the variance (dotted black line) of models runs.

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