Several years had
low sea ice cover in the past decade, yet most of those years were warm at middle latitude winters by 1951 - 1980 standards.
«This highly unusual state of the atmosphere has been linked to
record low sea ice cover during summer over the Arctic Ocean.
The
record low sea ice cover can be partially attributed to thin ice cover, from years of a declining trend, and in turn the thin ice cover could let more heat from the ocean to enter into the atmosphere.
In both 2002 and 2003, the Northern Hemisphere registered record -
low sea ice cover.
Some areas of the Arctic region showed monthly averages that were exceeded by more than 6 degrees and were linked to record -
low sea ice cover, according to the video.