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Scientist V. Ramanathan poses with several of the tiny airplanes that his research team used to study air pollution.
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Courtesy of Scripps Institution of Oceanography, UC San Diego

Finding Answers in the Clouds
News story originally written on May 21, 2008

Scientists are sending tiny airplanes buzzing in the sky to find out how air pollution can impact weather, climate, and global warming.

The tiny airplanes look like regular planes but they have only a wing span of eight feet and weigh less than 50 pounds. They do not have a pilot and are remote-controlled. But these planes are not toys. They are important research tools.

The team of scientists filled the planes with tiny instruments that measure different parts of the atmosphere. Then they flew the planes into clouds of air pollutants called brown clouds and the instruments collected data.

Brown clouds are a haze of tiny particles and water droplets of cumulus clouds. Sometimes they form naturally, such as during forest fires. But many brown clouds are made by people. The smoke from power plants, cars, trucks, and factories all adds to brown clouds. The pollution travels high in the atmosphere and is carried by the wind.

The scientists wanted to look at brown clouds from the inside out. They wanted to understand how air pollution changes the amount of sunlight that is reflected back out into space. The amount of sunlight that is reflected back out to space has an impact on Earth's temperature, weather, and climate.

They discovered that the increase in air pollution has shaded the Earth. More sunlight is now reflected back into space because there is more air pollution. So air pollution may hide some of the impact of global warming by keeping the planet somewhat cooler. As air pollution, which causes dangerous health problems, is reduced, our planet will get even warmer.

Last modified June 3, 2008 by Lisa Gardiner.

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