Figure 10. Decline of Arctic ice cap from 1980 (left) to 2012 (right). The bright white central mass shows the perennial sea ice while the larger light blue area shows the full extent of the winter sea ice, including the average annual sea ice during the months of November, December and January.1
Figure 10. Decline of Arctic ice cap from 1980 (left) to 2012 (right). The bright white central mass shows the perennial sea ice while the larger light blue area shows the full extent of the winter sea ice, including the average annual sea ice during the months of November, December and January.1
Arctic Ice Cap 1980
Source: http://www.nasa.gov/topics/earth/features/thick-melt.html