Copenhagen 2: dangers ahead

cop_logo_1_r_editedThe second section of the Copenhagen synthesis report, Social and Environmental Disruption, discusses the dangers of climate change relating to society and the environment, noting that scientific research provides a wealth of relevant information which is not receiving the attention one might expect.    

Considerable support has developed for containing the rise in global temperature to a maximum of 2 degrees centigrade above pre-industrial levels, often referred to as the 2 degrees guardrail. The report however indicates that even at temperature rises less than 2 degrees impacts can be significant, though some societies could cope through pro-active adaptation strategies.  Beyond 2 degrees the possibilities for adaptation of societies and ecosystems rapidly decline, with an increasing risk of social disruption through health impacts, water shortages and food insecurity.

Continue reading “Copenhagen 2: dangers ahead”

Start me up

[youtube]ro0-7U8UtvI[/youtube]

Above: a new animation of Arctic sea ice from 2000 to May 2009, from the Alfred Wegener Institute for Polar and Marine Research and KlimaCampus of the University of Hamburg in Germany. It accompanies their first contribution to this year’s sea ice forecasts — and they put the odds of a new record minimum at either 28%, or with an enhanced model that takes better account of current ice conditions about 49%. Close enough to my gut feeling of 50/50 to allow me a little confirmation bias, I think… The press release is here, and the full forecast here (pdf). The AWI modelling is part of the Search forecasting exercise I mentioned last week. The full set of forecasts should be out in the next week to ten days, according to project co-ordinator Jim Overland, and I’ll cover them when they become available.

[The Folksmen]

Southern freeze

penguin.jpgWhile we’re on the subject of ice, Australia’s Antarctic Climate & Ecosystem Cooperative Research Centre today launched two new publications: Polar ice sheets and climate change: global impacts [PDF], and Changes to Antarctic sea ice: impacts [PDF]. Described as “position analyses”, the papers provide an excellent overview of the current state of our understanding of ice sheets and how they’re behaving in a warming climate and the way Antarctic sea ice is responding to climate change.

Continue reading “Southern freeze”

North to Alaska

CT090609.png Interesting times in the Arctic, as spring turns into summer and the sea ice melts towards its summer minimum. Will this year’s minimum be a new record, or will the ice bounce back towards the long term (but still downward) trend? The first scientific forecasts of the season are expected soon from the Sea Ice Outlook project coordinated by ARCUS, the first yacht has set sail for an attempt to get through the Northwest Passage, and the usual suspects are insisting that the ice is continuing to recover. So what are the odds of a new record this year, and how is the ice really doing at the moment? The picture’s mixed…

Continue reading “North to Alaska”

Bear necessities

Polarbear.jpgScientific papers are often dull, worthy screeds, difficult to read and hard to understand without considerable effort, but sometimes they are an absolute pleasure. I can heartily recommend Amstrup et al. Rebuttal of “Polar Bear Population Forecasts: A Public-Policy Forecasting Audit”, Interfaces (2009) pp. 1-17 [PDF, Woods Hole press release] as a fine example of clarity and concision — and a classic slap down of “researchers” who haven’t taken the trouble to understand what they’re writing about. The rebuttal is of a paper by Armstrong, Green and Soon (AGS) (Armstrong et al. Polar Bear Population Forecasts: A Public-Policy Forecasting Audit, Interfaces (2008) pp. 382-405 [PDF]) in the same journal last year. AGS was highly critical of two US Geological Survey papers that were instrumental in persuading the authorities to list polar bears as an endangered species. The AGS “audit” paper is extensively quoted in Ian Wishart’s Air Con, in the chapter where he explains why the bears aren’t in trouble, so by way of correction (because you won’t be getting one from him), here’s what Amstrup et al have to say…

Continue reading “Bear necessities”