After tying for second lowest extent in September, Arctic sea ice began expanding rapidly. But that has turned around dramatically in October.
Arctic sea ice has been been growing much more slowly than average during October. Its geographic extent is now in a rough tie with 2007 and 2012 for the lowest in the satellite record for this point in the year.
The chart at right compares the evolution of Arctic sea ice extent during 2007, 2012 and 2016. This year is plotted in red. Note how