The early trends in this arctic melt season have caught a lot of people’s attention, but it’s way too early to make any bets.
For a complete rundown, see Nevin Acropolis’ account at Climate Progress, or at Nevin’s Arctic Sea Ice Blog.
Nutshell version here:
A few months ago some strong winds stretched the boundaries of the winter ice further than usual, particularly in the Bering Sea area, and a thin sheen of ice froze in behind the wind-blown leading edge. The Denia-sphere did the usual round of high fives about the “return to normal”.
Now as the melt season has begun, that thin ice has disappeared even faster than expected.
In addition, large areas of melt water are ponding on the ice. This causes satellites to read the melt ponds in some cases as open water, giving a bit of an exaggerated read on the melt – however, this also means that large areas of ice are getting some serious insolation, and this pattern of large meltwater areas was characteristic of the record 2007 summer.
Important to keep in mind. The mass of perennial (multi year, thick) ice is much diminished from what it was 5 or 6 years ago. Watch the NSIDC video animation below – you can see the progressive disappearance of the thick, multiyear ice over 3 decades. Watch the dates in the lower left corner, and you’ll see how 2005 and 2007 just knocked the stuffing out of the ice thickness. It has not recovered.
So, in 2012, we start with a much lower baseline than in previous years. Summer weather like we saw in 2010 or 2011 could very likely result in a new record low. If we see a set-up like 2007’s perfect storm, all bets are off.
Bottom line, its too early to tell, we’ll know more as we get into the peak months of July and August. I’ll be getting some regular briefings on this and will share what I find out.







