Temperature anomalies over 20 degrees Celsius

The area of the Kara Sea, Franz Josef Land and Svalbard shows temperature anomalies of over 20 degrees Celsius. How can such anomalies be explained?  

Above animation is a 4.7MB file. It may take some time for the animation to fully load. It covers the period December 7, 2011, to February 11, 2012.

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