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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.
Originally posted by kro32
reply to post by bigyin
Global average temperatures. No one debates that this is rising, really nothing more to it than taking temps around the world and comparing it to samples from the past. However when they start saying why it's happening or what it's effects will be is where the guessing game starts.
Originally posted by Gannicus
Originally posted by kro32
reply to post by bigyin
Global average temperatures. No one debates that this is rising, really nothing more to it than taking temps around the world and comparing it to samples from the past. However when they start saying why it's happening or what it's effects will be is where the guessing game starts.
Are those the temps taken by thermometers that are placed next to A/C units and on blacktop parking lots?
Old Dominion Univ
The last 10,000 years of geological history are referred to as the Holocene Era. During that time, global climate has been relatively stable, with swings from warmer temperatures to cooler and back again. On average, however, there has not been the kind of extreme climate oscillation that has in the distant past led to periods of glaciation. Nevertheless, Earth is overdue for a cold snap. Close examination of the way ice is presently traveling in ocean water, from frigid to warmer regions of the globe, suggests that the mechanisms for widespread planetary cooling may once again be engaging.
The process of ice rafting is intimately connected to temperature changes on global and regional scales. The physical movement of excessive amounts of ice from polar regions to lower latitudes by shifting ocean currents can lead to substantially lower temperatures.
That is, to understand the future, at least in terms of climate, one must understand the past. Any computer model designed to predict future climate change such as greenhouse gas-induced global warming must also reproduce the reconstructed past changes of ice drift in order to be considered reliable. Ice rafting is not just a passive recorder of past surface-ocean circulation, but also actively influences and changes present ocean circulation as well.