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Reader Gary Boden forwarded me a nice collection of online Arctic ice maps made by the US Navy in the 1940s. The map below is from September, 1946.
David Rumsey Collection : September 1946
As you can see, there was a lot more summer ice in 1946, particularly thick “permanent” ice.
The map below compares NSIDC end of September extent (yellow) vs. the Navy map (green.)
This map supports Julienne’s assertion that the ice pack has been declining since the 1950s.
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