By Paul Homewood

Further to recent posts on the Arctic, No Tricks Zone posted a relevant graph yesterday, showing historical Arctic sea ice  extent trends.

It is based on a reconstruction by Alekseev et al in 2016:

http://notrickszone.com/2018/08/24/arctic-summer-sea-ice-growth-trend-extends-another-year-greenland-summer-one-of-coldest-in-30-years/

It shows how meaningless it is to compare current levels with 1979, which both NSIDC and DMI do.

Pierre Gosselin has also patched the Alekseev graph with the AMO index (inverted). The correlation between the two is blindingly obvious.

Alekseev puts ice extent in the 1930s at a similar level to now. Other reconstructions tend to show the 1930s a bit higher relatively, but all show the same cyclical nature as Alekseev.