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Symposium examines the growing influence of aerosols on climate

In a few decades, it's likely that scientists will look back at the early part of the 21st century and regard it as a fundamental stage in understanding the importance of the effects of aerosols on Earth's climate. In fact, it was in this time period, they may say, that aerosols were first found to be as climatologically significant as greenhouse gases.

Aerosols, tiny atmospheric particles made up of various elements and produced by a range of sources, have become a prominent concern due to their ability to influence atmospheric and hydrological phenomena and their important impact on localized regions.

Several of the world's leading atmospheric and climate scientists will present recent research on aerosols from a selection of scientific angles on Feb. 14 at 2:30 p.m. at the annual meeting of the American Association for the Advancement of Science (AAAS) in Seattle.

"It has become clear that local effects on the heat budget from aerosols can be substantially larger than those from greenhouse gases. I believe we are at a very early stage of understanding the effect of aerosols," said Richard Somerville, a professor of meteorology at Scripps Institution of Oceanography at the University of California, San Diego, and the organizer of the AAAS aerosols symposium, titled "Our Hazy Atmosphere: Aerosols and Climate."

"Aerosols come from all kinds of sources: dust blown off the Sahara by wind, particles emitted from smokestacks, gas from volcanoes. There are many, many complicated interactions with aerosols that we are just beginning to learn about."

Because of their varied compositions, aerosols exert a complicated range of effects. Carbon dioxide primarily absorbs infrared energy emitted by the Earth, thus contributing to the greenhouse effect and warming the Earth's surface and the atmosphere. Aerosols, on the other hand, can either absorb sunlight, and thus produce a warming effect, or they can reflect or scatter sunlight and pr
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Contact: Mario Aguilera
scrippsnews@ucsd.edu
858-534-3624
University of California - San Diego
14-Feb-2004


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