Tag: Greenland

Every loser wins

The Arctic sea ice has started its autumn freeze up. Both the NSIDC and Cryosphere Today metrics show significant increases over their minima for the year, and so I’ve settled my debts to Malcolm and William “Stoat” Connolley. To settle Malcolm’s bet, I have donated $40 to Women’s Refuge (they’re sending a receipt, which I will happily post when it arrives if Malcolm so wishes), but with William I have elected to go “double or quits” on next year’s minimum. He does get a signed copy of Hot Topic though, and it should be with him by the weekend or early next week. To ensure carbon neutrality for the airmail shipping, I will plant an extra tree in the truffière… 😉

So what are the prospects for next year? Will the ice consolidate a little more, hover around the 2007 and 2008 level, or beat 2007? My gut-feel (and, in the absence of further info on how the ice finished this summer, that’s all it is) is that the odds remain roughly 50/50 on a new record. A warmer winter than last, or a sunnier summer is all that it might take to cause greater loss. So I’m happy with my double or quits – at least for the time being.

NSIDC September 24th update here (note continuing reduction in multi-year ice). NASA reports that ice loss in August was fastest ever seen – and produced an excellent animation of ice coverage over the year (in right column, third image down). Meanwhile, ice loss from Greenland is also increasing (there should be much more concrete info later this year when the 2008 summer season reports start appearing), and a team at Ohio State University are beginning the Arctic System Reanalysis project, which will “merge a decade of detailed atmospheric, sea, ice and land surface measurements into a single computer model-based synthesis. The coupling of these immense data sets will produce complex and instructive descriptions of the changes occurring across the normally frigid, remote region.” The project will generate about 350 TB of data. Won’t run on my Macbook Pro, then… Plus there’s some learning about ice going on at the blog of a real ice man – Bob Grumbine’s More Grumbine Science here.

I’m (possibly/probably) a loser

200809NSIDCmin.pngThe National Snow & Ice Data Centre in the USA has declared that this year’s minimum Arctic sea ice extent has been reached – 4.52 million square kilometres on September 12th, only 390,000 km2 more than the record 2007 minimum (and 2.24 m km2 below the 1979-2000 average minimum). It looks as though their line may bump along the bottom of the graph for a while, so there may be some potential for that number to reduce a little. Their figure for Sept 12 is 9.4 percent above the 2007 minimum, so unless there’s some unprecedented melt over the next couple of weeks, I am prepared to accept that I have lost my bet with Malcolm (see comments here and at Poneke! here), which was based on NSIDC numbers. My cheque book is at the ready.

Continue reading “I’m (possibly/probably) a loser”

The trumpet shall sound

NZGeo08.jpg A cracking issue (#93) of New Zealand Geographic has just hit the streets – a climate change special, complete with free map of both poles. Dave Hansford looks at impacts on NZ flora and fauna, Alan Knowles examines the energy alternatives being developed here, plus there’s a range of features from around the world – including an excellent article on climate change and winemaking. I’ve got a piece in there on the long-range forecast for NZ, but the knees are not mine. I’m biased by taking the NZGeo shilling, but even so the magazine is clearly an essential part of the intellectual landscape of this country and deserves support. Well worth $14.95 of anyone’s money.

Hit somebody! (The hockey song)

0901hockeythumb.png Expect a renewed interest in the shape of hockey sticks, as a new paper in the Proceedings of National Academy Of Sciences (PNAS) by Michael Mann (et al) finds that the last decade was the warmest for at least 1,300 years. The BBC headlines the story “Climate “hockey stick” is revived”, which rather stretches the facts about the controversy (nicely covered in the piece). More coverage at Mongabay, which notes:

The results confirm that temperatures today in the Northern Hemisphere are higher than those of the Medieval warm period, a time when the Vikings colonized Greenland are are believed to have become the first Europeans to visit North America.

Sounds like a red rag to sceptic bulls to me. Expect much nit-picking and fulmination. The rest of us will get on with trying to sort out the problem.

Mann et al. (2008). Proxy-based reconstructions of hemispheric and global surface temperature variations over the past two millennia. PNAS September 9, 2008 vol. 105 no. 36 (PDF available here)

You ain’t seen nothing yet

arctic_AMSRE_29808.png This year’s Arctic sea ice minimum is now officially the second lowest in the record according to the National Snow & Ice Data Center in the US. On August 26, the ice extent stood at 5.26m km2, dropping below 2005’s 5.32m km2. The melt season still has several weeks left to run, and there are now suggestions that this year’s final minimum could be close to – perhaps even beat – last year’s record.

The NSIDC announcement has attracted a flurry of attention, and the media has been out trawling the usual suspects for quotes. The BBC reports:

Researchers say the Arctic is now at a climatic “tipping point”. “We could very well be in that quick slide downwards in terms of passing a tipping point,” said Mark Serreze, a senior scientist at the Colorado-based NSIDC. “It’s tipping now. We’re seeing it happen now,” he told the Associated Press news agency.

Adding to the interest, the European Space Agency released some interesting Envisat images of the state of the sea ice, and warned:

Following last summer’s record minimum ice cover in the Arctic, current observations from ESA’s Envisat satellite suggest that the extent of polar sea-ice may again shrink to a level very close to that of last year.

Meanwhile, Scientific American notes that the northwest passage is now open, and the Environment News Service does an admirable job of pulling all the info together – including recent work on possible rapid climate change around the Arctic. Earlier this month I was prepared to accept that I was going to lose my two bets on a new record minimum this year, so what’s been going on up north to change the outlook so dramatically?

Continue reading “You ain’t seen nothing yet”