http://arctic.atmos.uiuc.edu/cryosphere/

Arctic ice continues to grow at a very fast rate, despite the fact that 2010 is the hottest year on record and the Arctic is the fastest warming place on earth.

When water freezes, it releases heat. This causes the air temperature above it to rise.  We may be starting to see this effect in Arctic air temperatures north of 80N.

http://ocean.dmi.dk/arctic/meant80n.uk.php