26 Sep '11, 12pm

Cosmic rays and clouds: Potential mechanisms

Cosmic rays and clouds: Potential mechanisms

Increased CCN concentrations lead to increased concentrations of cloud droplets. More cloud droplets will lead to increased reflection of sunlight from the cloud to space, and may under some circumstances lead to a reduction of precipitation and an increased lifetime of the cloud. How much these cloud properties depend on CCN concentrations is a major area of research in general. CCN concentrations have more than doubled in many polluted regions due to human-generated emissions, so we are working hard to understand how this has affected clouds. Given that CCN concentrations have changed so much from human influence, a change in CCN of less than 1% due to cosmic rays seems quite minor. Indeed, cloud reflectivity, precipitation and cloud lifetime will generally change by less than the change in CCN for most clouds (e.g. we know that cloud cover has not more than doubled due ...

Full article: http://www.realclimate.org/index.php/archives/2011/09/cos...

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