Panic over Arctic temperatures got smeared across news networks last week, so I think a bit of perspective is in order, including an assessment of what this means for polar bears and their prey (because some of the hysteria is being amplified from that corner).
The region causing all the kerfuffle is at the northernmost tip of Greenland (see map below), where there is a weather station at Cape Morris Jesup. Next-nearest stations are at Alert, Canada (to the west) and Longyearbyen, Svalbard (Norway, to the east).
Arctic temps spike over 30 degrees in the midst of winter (The Weathern Network, Friday, February 23, 2018) included the tweet below, showing a fracture of sea ice north of Greenland so transient that it does not show up on daily sea ice maps:
“Along with those spikes in temperature, Lars Kaleschke’s tweet, above, also shows the large rift in the sea ice that opened up just north of Cape Morris Jesup, at the same time. Kaleschke is a professor of sea ice remote sensing at the Center for Earth System Research and Sustainability, at the University of Hamburg, in Germany.“
Summary: Temperature and sea ice “abberations” in northern Greenland are transient phenomena that have clearly happened before (e.g. 2011) without major consequences except perhaps through impacts on eastern Arctic and subArctic weather conditions (including the UK).
Lack of sea ice north of Svalbard in the Barents Sea occuried last year and in 2012 in Februrary. But by mid-to-late March, when seal are beginning to give birth on the ice and polar bears are busy hunting them, ice had again covered the region. This year is likely to be the same. However, we won’t know until the end of March or ealry April if a recovery will or won’t happen, so any alarm-ringing about impacts on Arctic fauna surival have no foundation in fact until then.
Scorsby Sound, East Greenland bear in March 2011. Rune Dietz, press photo.
In the Bering Sea, ice extent is well below average for this time of year but studies show the one consistent feature of Bering Sea ice is its variability. Low ice levels have distressing impacts for St. Lawrence island seal and whale hunters. However, there is certainly enough ice in the Bering Sea/Chukchi Sea region for polar bears and Arctic seals to do what they do this time of year (which is try to survive until early April, at which time seals start giving birth to their pups and polar bears start to eat them, with gusto). And the ice season isn’t over: maximum extent of ice in the Bering sea doesn’t usually come until late April or May, and the dramatic decline of mid-February already shows signs of reversing.
Details below this ice map for 24 February 2018, courtesy NSIDC Masie:
PS. I’m off within hours to Toronto for the launch of my State of the Polar Bear Report in honour of International Polar Bear Day, 27 February. Watch for reports in the news and for my op-ed 27 February at the Financial Post.
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