Monthly Archives: October 2015

Sea ice is not a stable habitat for polar bears – summarized today in The Arctic Journal

In The Arctic Journal, 7 October 2015: Unstable thinking about polar bear habitat [not my title choice]

Unstable thinking about polar bear habitat_Oct 7 2015 title page

This is a previously unpublished summary, written exclusively for The Arctic Journal, of my peer-reviewed, fully referenced essay on this topic that was published earlier this year by the Global Warming Policy Foundation in their “Briefing Paper” series (#16, June 8, 2015: The Arctic Fallacy: Sea Ice Stability and the Polar Bear), which includes a foreword by Dr. Matthew Cronin, Professor of Animal Genetics at the University of Alaska Fairbanks. Pdf here.

Here are the essential points, one by one:
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Churchill has polar bears, Victoria has cougars

cougar (aka puma/mountain lion) was captured in downtown Victoria yesterday (my home town), with all the drama given a polar bear attack. No polar bear alert program here, just cougar tracking hounds on standby and officers with guns and tranquilizer darts.

The Globe and Mail has video here.

Victoria cougar location Oct 5 2015

Details and quotes below. CBC story was the only one to include a map, which I have put into polar bear perspective.
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Tracking polar bears – 3 out of 4 S. Beaufort bears on the ice during September 2015

The shore of Alaska is not very important to Southern Beaufort polar bears – most of them stay on the sea ice during the summer and early fall, where they may or may not continue eating. These results of on-going satellite tracking studies by USGS1 confirm results of previous studies.

Tranquilized_pb570_S Beaufort March 2014_USGS

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Beaufort Sea swimming polar bears far from land but not very far from sea ice

Recent accounts of an encounter with a curious polar bear female and her two older cubs in the Beaufort Sea on 16 September give contradictory details about the position of sea ice at the time. The same researcher told one reporter that the ship was 240 km from land, another that it was 240 km from the sea ice, and in another account (that he wrote himself), said the ship had been far from land and sea ice.

Beaufort swimming polar bears_Sept 30 2015_Global news

University of Victoria (Canada) chemical oceanographer Jay Cullen said on the expedition web site:

“After arriving on station and beginning work the crew noticed three polar bears in the water together which swam around to the ship when our water sampling system was nearly 3500 meters below the surface. The ship was located far from sea ice and land. Indeed, Arctic sea ice extent was the fourth lowest on record this year and there has been speculation that this imposes stress on polar bears which rely on the ice to hunt.”  [my bold]

But the maps below show that at the time of the incident (taken from the expedition web site) and the NSIDC Masie sea ice map for 16 September 2015, the ship [the CCGS Amundsen, acting as a research vessel] was actually quite close to an isolated large patch of sea ice, although further from the edge of the main pack. A patch of sea ice plenty big enough for a polar bear to rest upon – no wonder the bears did not appear stressed.

And the polar bear biologist Cullen consulted (Dr. Andrew Derocher) implied by his response that the bear was indeed far from sea ice. Reminds me of the swimming polar bear off the Hibernia oil platform off Newfoundland March 2015, which turned out to be not far from ice at all. See what you think.
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