Summer refuge for polar bears in Arctic Basin only 0.3 mkm2 below its possible maximum

At the seasonal minimum 2015, the Arctic Basin was still almost full of sea ice, down only 0.3 mkm2 below the maximum it could ever be.

Healy Aug 24 2015 Polar-Bear III Tim Kenna

Remember that spending the summer in the Arctic Basin for most polar bears is just like sitting on the western shore of Hudson Bay – they are all waiting for the refreeze. In either location, they might find something to eat, they might not.

Below are NSIDC MASIE sea ice maps for 10 April 2015 (as big as it gets, basin filled) vs. 17 September 2015:

Arctic Basin at 17 Sept 2015_vs 10 April

Ice extent in the Arctic Basin was the same (2.9 mkm2) at this year’s September minimum, officially 11 September 2015, below:


And in 2012 (the lowest minimum extent since 1979), extent in the Arctic Basin was 2.7 mkm2, below:


However, in 2007 (below), the Arctic Basin was even smaller: 2.6 mkm2 at the seasonal minimum, yet polar bears continued to do well. Southern Beaufort bears began their recovering from the thick spring ice conditions of 2004-2006, see previous posts here and here) and even though most of the melt was in the Chukchi Sea, polar bear in 2008 were found to be in excellent condition and reproducing well.


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