It’s still based on the same flawed ecological premise as all previous models – it assumes that sea ice was a naturally stable habitat until human-caused global warming came along. It also uses slight-of-hand maneuvers to correlate declining summer sea ice and declining polar bear population numbers.
Just because they keep repeating the same hype doesn’t make it true.
Posted in Advocacy, Conservation Status, Sea ice habitat
Tagged activist, AGW, Amstrup, Arctic, Atwood, climate warming, decline, ecoregions, emissions, extinction, fallacy, flawed, global warming, greenhouse gas, ice-free, models, polar bear, polarbearscience, population, press release, science, sea ice, sea ice loss, summer, thick spring ice, threat, threatened, USGS, variation
Polar bear habitat over Hudson Bay was average this week (at 60% coverage), despite the odd pattern of breakup – but the end of spring in the Arctic is only 5 days away and there is still plenty of polar bear habitat in all regions.
According to the Canadian Ice Service (CIS), there is still more ice in the eastern portion of the bay than usual and much less in the northwest (Fig. 1 below). There is far more ice than average ice in Hudson Strait, the approach to southern Davis Strait.
Figure 1. Hudson Bay sea ice, difference from average at 22 June 2015. Blue is less than average, red is more than average. CIS. Click to enlarge.
Posted in Life History, Sea ice habitat
Tagged Arctic, Barents Sea, Beaufort Sea, breakup, global, habitat, Hudson Bay, melt ponds, polar bear, satellite collars, science, sea ice, spring, summer fast, Svalbard, western hudson bay
Good news from Norway: polar bears around Svalbard are in excellent condition this spring and many females with new cubs have been spotted. This is a marked turn around from conditions just last year.
According to a Norwegian news outlet yesterday, Jon Aars (Fig. 1, below), from the Norwegian Polar Institute, confirms that this has been an excellent year for polar bear cubs around Svalbard because there has been abundant sea ice near denning areas on the east coast.
Figure 1. Biologist Jon Aars with a Svalbard cub.
Posted in Conservation Status, Life History, Sea ice habitat
Tagged AMO, Arctic, Atlantic Multidecadal Oscillation, Barents Sea, body condition, cubs, denning, fall, Franz Josef Land, Jon Aars, Madden-Julian Oscillation, Norwegian Polar Institute, NSIDC, polar bear, science, sea ice, spring, Svalbard, winter
Was 1990 really the earliest ice breakup year for Western Hudson Bay polar bears – and why aren’t breakup dates derived from the same data identical? Two serious questions that need answering.
The suggestion a few weeks ago by Andrew Derocher that the unusual breakup pattern of sea ice breakup in Hudson Bay this year might set a new record reminded me how often I’ve questioned the claim that 1990 had the earliest breakup for WHB since 1971.
I call this date into question for two reasons: 1) sea ice maps and charts like those shown below suggest an early breakup in 1990 was not possible, by any definition of the term; 2) none of the research reports on WHB bears, for periods that included 1990, mention that breakup in 1990 was especially early, even though many commented (often at length) about the especially late breakup in 1992.
How much does this very early breakup in 1990 contribute to the apparent declining trend in breakup dates since 1979?1 Is the early breakup date in 1990 real, perhaps a bizarre consequence of analyzing the data square-by-square over a grid? Or, were there errors in 1990 sea ice data that eventually got corrected by sea ice folks but not by polar bear biologists?
UPDATE 17 June 2015 – PDF HERE of this post, with higher resolution images, for those who want to explore the questions I’ve posed or share them.
Sea ice coverage for Hudson Bay on 14 June converged on levels recorded in 2013, when breakup was slightly later than the average of the last two decades.
There is also more ice over Hudson Bay than there was in 2011, which was an early breakup year (charts for other Arctic regions here, originals here).
Andrew Derocher notes (via twitter) that rather than heading to shore, most of the Hudson Bay bears with satellite tracking collars (7/10) are out on the ice (Fig. 1 below). They appear to be hunting along the ice edge, where they are most likely to find seals.
Update 17 June 2015: Sea ice images for the week 18 June 2015 compared to other years added below, for Hudson Bay and the Beaufort Sea.
Posted in Life History, Sea ice habitat
Tagged Arctic, breakup, Derocher, Hudson Bay, Lentfer, polar bear, polar bear movements, Polar Bears International, polarbearscience, ringed seals, satellite collars, sea ice, tracking, western hudson bay
Recently, several polar bear biologists have teamed up with photographers to get pictures of starving bears into the scientific literature – and picked up by the media, with mixed results.
For the second time in five years, polar bear biologist Ian Stirling has teamed up with a photographer to give unwarranted scientific credence to an anecdotal account of polar bear behaviour. It included a picture of a pitifully thin animal (classic animal tragedy porn) and was framed to increase alarm over predicted effects of global warming. It got little media attention.
His Norwegian colleagues Jon Aars and Magnus Andersen have just done the same with a bear caught eating a white-beaked dolphin (photo above) – but this time the media took the bait.
Update 13 June 2015 – Information added on white-beaked dolphin distribution, sea ice conditions in 2014 and a correction. See below.
Posted in Advocacy, Life History, Sea ice habitat
Tagged Aars, AMO, Andersen, aquatic stalk, Arctic, Barents Sea, bearded seal, behavior, behaviour, caching, dive, evolution, global warming, Lagenorhynchus albirostris, polar bear, Polar Bears International, polarbearscience, sea ice, starving, Stirling, Svalbard, swim, thin, thin ice, tragedy porn, trapped, underwater, White-beaked dolphin