Thanks to NASA’s Earth Observatory site, a (rare?) opportunity to compare Arctic sea ice extension as shown on Cryosphere Today with the real world (as seen by the Terra satellite).
DISCLAIMER: The following should in no way be interpreted as suggesting anything untoward is being done at Cryosphere Today
The Earth Observatory’s “Image of the Day” for Jan 16, 2010 shows “Ice and Clouds in the Bering Strait“.
Let’s take now the sea ice extent image from Cryosphere Today, for Jan 16, 2010, and zoom in to the area described above:
We can finally compare Fig. 7 with Fig. 1.
What is evident is that the Cryosphere Today processing eliminates the kind of ice that can be found right at the edge of the pack (visible as “dendrils” after a suitable magnification). The neat sea ice – open water distinction is a computational illusion.
Other evidence of missing sea ice from the Cryosphere Today image is along the Alaskan coast, for example in the black, apparently ice-free “shadow” of Nunivak island
Seemingly, the ice around the island is “broken up” by its presence, and for some reason disappears in a restricted area in the Cryosphere Today image.
So the question is…how much of this “marginal” ice is lost in Cryosphere Today compared to the real world?