By Paul Homewood
h/t Dave, Andy and Pethefin
For the last few months, there has been a widening divergence between the two Arctic sea ice extent graphs produced by DMI.
The above chart for Feb 2nd, accessed via the Wayback Machine, is for 30% ice concentration, and shows ice extent at 10-year high levels since October.
This is how DMI describe this data:
Total sea ice extent on the northern hemisphere since 2005. The ice extent values are calculated from the ice type data from the Ocean and Sea Ice, Satellite Application Facility (OSISAF), where areas with ice concentration higher than 30% are classified as ice.
The total area of sea ice is the sum of First Year Ice (FYI), Multi Year Ice (MYI) and the area of ambiguous ice types, from the OSISAF ice type product. However, the total estimated ice area is underestimated due to…
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