Tag Archives: sea ice models

IUCN Polar Bear Specialist Group out-lived its usefulness 20 years ago

The IUCN Polar Bear Specialist Group (PBSG) should have been disbanded in 1996, the year polar bears were down-graded from a status of ‘vulnerable to extinction’ to ‘lower risk – conservation dependent’ (now called ‘least concern’) on the IUCN Red List.

Bumpersticker from Cambridge Bay, Nunavut, courtesy Joe Prins.

Bumpersticker from Cambridge Bay, Nunavut, courtesy Joe Prins.

Polar bears had recovered from previous decades of wanton over-hunting — by all measures used by the International Union for the Conservation of Nature, they were a conservation success story.

Why did the IUCN and Arctic governments not break up the PBSG back in 1996? Leaving the group intact once polar bears were down-graded to ‘least concern’ simply made its members desperate to justify their existence. That’s precisely what we’ve seen over the last 20 years — PBSG members working tirelessly to ensure the organization didn’t go extinct.

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In fact, polar bears are in no more danger of extinction now than they were in 1996, despite dedicated efforts of the PBSG to convince the world otherwise. Take a look at the history and see if you come to a different conclusion.
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BBC provides a forum for desperate biologists: “Will polar bears become extinct?”

Yesterday, the BBC published a story that gave the two most alarmist polar bear researchers on the planet a forum to market their ‘polar bears are doomed’ message. This time the desperation shows: watch how these biologists move the goal-posts, make claims so misleading they border on lies, and pretend they don’t have big, big trouble with their predictive models.

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Amstrup photo that accompanied an interview last month.

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Has the tide turned on polar bears as icons of global warming?

The CBC in Canada is pretty much a mirror image of the BBC in the UK, ABC in Australia and PBS in the US. So you might appreciate my shock at the almost unbelievable balance contained in the recently broadcasted CBC documentary, “The Politics of Polar Bears: Tracking the Celebrity Bear.

The film is a profound change from the hype and pessimism that has dominated the polar bear issue in Canada and abroad, supported unchallenged by the CBC. Finally, TV viewers were given some decently balanced perspective on the status of polar bears in  Western Hudson Bay.

If the take-away message tipped towards reason and optimism rather than panic over the status of polar bears, it’s because the evidence was strongly in that direction.

Politics of polar bears title

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Sea ice experts make astonishing admissions to polar bear specialists

Climate scientists specializing in future sea ice predictions made some remarkable statements to polar bear scientists at their last meeting – admissions that may really surprise you.

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Back on June 26 (reported here), the IUCN Polar Bear Specialist Group (PBSG) posted a summary of its last meeting. So, I was very surprised to find (while there looking for something else), that on 18 July 2014 they had added minutes from the meeting to that summary.

These minutes are a bonanza because among the juicy nuggets of information is a summary of what the three invited climate scientists from Colorado (Jennifer Kay, Mark Serreze, and Marika Holland) had to say and what questions were asked. While real transparency would have involved posting copies of the sea ice presentations and transcripts of the question and answer sessions, this is certainly better than nothing.
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Polar bear spin reaches new heights as geneticists promote their work

A new paper out in the journal PLoS Genetics proposes that a hybridization event between female polar bears and male brown bears (aka grizzlies) occurred in Southeast Alaska at the end of the last ice age. I’ll get to a discussion of the paper itself (coming in a day or two) but first I have a few things to say about the global warming hyperbole generated by the people promoting the paper. I found it simply mind-boggling.

While the paper itself (Cahill et al. 2013: “Genomic Evidence for Island Population Conversion Resolves Conflicting Theories of Polar Bear Evolution”) contains only one short phrase that could possibly be interpreted as linking the results to future scenarios of catastrophic global warming, some of the co-authors have made statements (for the press release and in media interviews) that spin the global warming mantra right over the top. Continue reading

Polar bears of W. Hudson Bay came ashore in 2009 as late as in 1992

It’s like pulling teeth, getting up-to-date information on breakup dates of Hudson Bay sea ice. You’d think with the importance of this seasonal event to the polar bears of Hudson Bay (some of which, we’re told, face the most perilous future of all polar bears worldwide), we’d get a press release every summer alerting us to the precise date of sea ice breakup and the subsequent arrival of the bears onshore. I’m thinking of something similar to the dispatches we get from the National Snow and Ice Data Center (NSIDC) when Arctic sea ice reaches its yearly maximum (e.g. March 2012) and its yearly minimum extent (e.g. September 2012).

Sadly, this is not the case.

So I was intrigued to see that a new paper just out in the Journal of Animal Ecology, by Seth Cherry (a Ph.D. student of Andrew Derocher) and colleagues, dealt with Hudson Bay breakup dates. I was hoping for some data beyond 2007, which has been the limit of information provided so far by polar bear biologists (see previous posts here and here). Unfortunately, because the methods for determining breakup dates in this paper are so different from previous ones (more detail below), the new data (1991-2009) can’t be compared to earlier studies that go back to 1979. But there is some good news.

Although you wouldn’t know it by the author’s conclusion, the results of the study confirm for this region my previously stated contention that polar bears need spring and early summer ice (March through June) for gorging on young, fat seals and documented declines in sea ice have rarely impinged on that critical feeding period – by which I meant, bears have seldom, if ever, been forced off the ice of Hudson Bay as early as June.

The study also confirms that there has not been any kind of spectacular retreat of sea ice breakup dates – coming earlier and earlier in the season – over the last 19 years and that polar bears did not arrive on shore in 2009 until very late – approximately 22 August – the same date they came ashore in 1992.

Below are two figures from the paper: one (the map) necessary to understand the new “Cherry method” of calculating breakup dates for Hudson Bay (no disrespect intended) and the other (the graph), which presents the data collected. The table with my converted breakup dates is below them. A few quotes from the study and some comments on it follows.

UPDATE (March 21 2013; 6:12 PM PST). A typo in the table has been fixed (2001 is Jun 21 not Jul 21) and the post amended accordingly.
UPDATE 2 (July 7, 2013) The Cherry et al. paper is now in print, the references have been updated accordingly.

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