Air pollution reduces rainfall in China

| 1st September 2009
The EU should set tougher industrial carbon emissions cuts

Heavy pollution in China is reducing levels of light rainfall

Half a century of heavy industrial pollution in eastern China is reducing rainfall, increasing the risk of drought and threatening harvests.
 

Air pollution in eastern China over the last 50 years has led to a reduction in rainfall, according to a Swedish-led study.

A team of climate researchers from the USA, China and Sweden found that in some parts of eastern China, where most people live and where pollutant emissions are greatest, the number of days with rain had dropped by 23 per cent in 50 years.

Writing in the Journal of Geophysical Research Atmospheres, researchers said the lack of rainfall was directly linked to concentrations of aerosol, small particles surrounded by gas and water, in the atmosphere.

Collecting data from 162 weather stations in China, researchers found that high levels of aerosol led to smaller raindrops.

As it is more difficult for smaller raindrops to form into rain clouds that can release rain this results in less rainfall.

Useful links
Heavy pollution suppresses light rain

See also
Blog: travelling through CO2 in China

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