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Colorado State University scientist simplifies aerosols for modeling
Date:5/26/2010

The large number of tiny organic aerosols floating in the atmosphere emitted from tailpipes and trees alike share enough common characteristics as a group that scientists can generalize their makeup and how they change in the atmosphere.

The groundbreaking research by Colette Heald, assistant professor in the Department of Atmospheric Science at Colorado State University, was highlighted this month on the cover of the American Geophysical Union's prestigious Geophysical Research Letters.

"The hope is that we can start to accurately represent organic aerosols in climate models so we can address how they impact climate and air quality, and particularly the issue of how much is natural and how much comes from human activities," Heald said. "What we're really trying to get at is the composition what's in the atmosphere, how is it changing and where does it have an environmental impact? Many of the compounds in the atmosphere are really short lived, so the picture changes quickly."

The atmosphere contains many different kinds of aerosols such as dust and sulfate as well as organic aerosols. These organic aerosols come from many different sources, including fossil fuel emission and wildfires. Fungi, bacteria and pollen are among the major biologically produced organic aerosol particles. Further complicating the picture are atmospheric gases that change over time and can become aerosols in the atmosphere.

But for climate models, the differences may not matter as much as previously thought.

Heald plotted hydrogen-to-carbon and oxygen-to-carbon ratios from observations of aerosols in the laboratory and in field experiments from such places as Mexico City, the Amazon and Los Angeles. Even though the studies looked at different aerosols from very different environments, she could classify them as a group based on their overall oxygen and hydrogen content.

Oxygen also plays a role in changing the chemical makeu
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Contact: Emily Wilmsen
Emily.Wilmsen@colostate.edu
970-491-2336
Colorado State University
Source:Eurekalert  

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Colorado State University scientist simplifies aerosols for modeling
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