Old apparatus reveals a flaw in models of the climate

Clouds in a jar
A new experiment with old apparatus reveals a flaw in models of the climate
Aug 27th 2011

CLOUD chambers have an honoured place in the history of physics. These devices, which generate vapour trails that mark the passage of high-energy subatomic particles, were the first apparatus that allowed such passage to be tracked. That was in the 1920s and led, among other things, to the discovery of cosmic rays. Science has moved on since then, of course, and cloud chambers are now largely museum pieces. But the world’s leading high-energy physics laboratory, CERN, outside Geneva, is dusting the idea off and putting it into reverse. Instead of using clouds to study cosmic rays, it is using cosmic rays to study clouds. In doing so, it may have thrown a spanner into the works of the world’s computer models of the climate. (Economist)

CERN Finds “Significant” Cosmic Ray Cloud Effect
Thursday, 25 August 2011 08:46 Dr. David Whitehouse

CERN’s CLOUD experiment is designed to study the formation of clouds and the idea that Cosmic Rays may have an influence. The take-home message from this research is that we just don’t understand clouds in anything other than hand-waving terms. We also understand the effects of aerosols even less. The other things to come out of it are that trace constituencies in the atmosphere seem to have a big effect on cloud formation, and that Cosmic rays also have an effect, a “significant” one according to CERN. (GWPF)

Did CLOUD Just Rain on the Global Warming Parade?
Warren Meyer

One of the hot topics, so to speak, in the global warming debate is allocating responsibility for 20th century warming between natural and man-made effects. This is harder than one might imagine — after all, no one’s thermometer has two readings, one for “natural” and one for “man-made.” This week, from CERN in Geneva, comes an important new study in this debate. (Forbes)

CERN: ‘Climate models will need to be substantially revised’
New atomsmasher research into cloud formation
Andrew Orlowski

CERN’s 8,000 scientists may not be able to find the hypothetical Higgs boson, but they have made an important contribution to climate physics, prompting climate models to be revised.

The first results from the lab’s CLOUD (“Cosmics Leaving OUtdoor Droplets”) experiment published in Nature today confirm that cosmic rays spur the formation of clouds through ion-induced nucleation. Current thinking posits that half of the Earth’s clouds are formed through nucleation. The paper is entitled Role of sulphuric acid, ammonia and galactic cosmic rays in atmospheric aerosol nucleation.

This has significant implications for climate science because water vapour and clouds play a large role in determining global temperatures. Tiny changes in overall cloud cover can result in relatively large temperature changes.

Unsurprisingly, it’s a politically sensitive topic, as it provides support for a “heliocentric” rather than “anthropogenic” approach to climate change: the sun plays a large role in modulating the quantity of cosmic rays reaching the upper atmosphere of the Earth. (The Register)