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Researchers improve predictions of cloud formation for better global climate modeling

ocation and how long it has been in the atmosphere. Until now, people have measured and averaged properties over long periods of time. "Yet particles are mixing and changing quickly," Nenes said. "If you don't factor in the chemical aging of the aerosol, you can easily have a large error when predicting cloud droplet number."

Working with Gregory Roberts at the Scripps Institution of Oceanography, Nenes developed a new type of cloud condensation nuclei (CCN) counter. This instrument exposes different aerosol particles to supersaturation, which enables researchers to determine: 1) how many droplets form and 2) how long they take to form.

Providing fast, reliable measurements, the CCN counter can be used on the ground or in an aircraft. "It gives us a much needed link for determining how different types of emissions will affect clouds formation," Nenes explained.

Nenes and Roberts have patented the CCN instrument, and a paper describing the technology will be published in an upcoming issue of the journal Aerosol Science and Technology.

The new modeling method and CCN instrument have far-reaching applications for predicting climate change and precipitation patterns, the scientists believe.

The indirect aerosol effect is counteracting greenhouse warming now, but will stop at some point, Nenes explained. "One of our goals is to figure out how long we'll have this cooling effect so we can respond to changes."


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14-Dec-2004


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