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The role of goop: Research shows pollution doesn't change the rate of droplet formation
Date:2/18/2013

When it comes to forming the droplets that make up clouds, a little oily and viscous organic material apparently doesn't matter that much. And that's good news for reducing the uncertainty of climate model predictions.

Understanding cloud formation is essential for accurate climate modeling, and understanding cloud formation begins with the droplets that make up clouds. Droplets form when water vapor is attracted to particles floating in the atmosphere. These particles include dust, sea salt from the ocean, microorganisms, soot, sulfur and organic material that can be both viscous and oily.

For years, scientists had believed that particles coated with this organic "goop" produced by combusted petroleum and biomass could form droplets more slowly than other particles. That would have had a significant impact on the formation of clouds.

But a study being reported this week in the journal Proceedings of the National Academy of Science suggests that the long-held belief isn't true. Based on aerial and ground-based measurements of droplet formation from ten different areas of the northern hemisphere, researchers at the Georgia Institute of Technology report that organic coatings on particles don't seem to significantly affect the rate at which droplets form. The researchers studied a wide range of particles, including organic, hydrocarbon-rich particles from the 2010 Deepwater Horizon oil spill in the Gulf of Mexico.

"It turns out that it doesn't matter how much goop you have or don't have the droplets take the same time to form," said Athanasios Nenes, a professor in the School of Earth and Atmospheric Sciences and the School of Chemical and Biomolecular Engineering at Georgia Tech. "Even in extreme environments like Deepwater Horizon, the rate of droplet formation on particles found over the spill doesn't differ from that of typical sea salt particles."

The research was scheduled to be published in the earl
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Contact: John Toon
jtoon@gatech.edu
404-894-6986
Georgia Institute of Technology
Source:Eurekalert

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