Daily Archives: September 2, 2015

Tracking polar bears – two S. Beaufort bears spent August 2015 on ice that doesn’t exist

Two out of seven polar bears with collars in the Southern Beaufort Sea either spent the month of August on ice that satellites couldn’t see – or they spent the entire month swimming around the Beaufort. Which seems most likely?

Thin ice Lisa Robbins Sept 15 USGS_04

See previous discussions here and here regarding the problem satellites have in accurately detecting melting ice. The presence of these two bears is evidence that there is more polar bear habitat than satellites record as officially present. This was also an issue for Hudson Bay bears earlier this year.

Five out of the seven visible females were on the ice in August – but are the other six bears that were visible last month spending the summer in the Arctic Basin like the one I reported last week? Or have their collars actually failed or dropped off? USGS isn’t saying.

See the August track map below, from the USGS Tracking Polar Bears website1 and a sea ice map.
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