Arctic Sea Ice Extent: Lower than Normal is the Norm
The National Snow and Ice Data Center has been tracking Arctic Ocean sea ice extent for many years, and yesterday released new data on the extent of Arctic sea ice, compared to the 1981-2000 average for this time of year:
As you can see, the 2015 Arctic Ocea sea ice extent has consistently fallen well below the old norm.
The latest monthly summary by NSIDC displays the trend in sea ice extent in the Arctic Ocean for the month of October reaching all the way back to 1979 (actual data observations in black, best fit line in blue):
More than 1.5 million square kilometers in Arctic sea ice extent has been lost over the past 36 years. That’s not weather; it’s climate change.