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Optimizing climate change reduction
Date:9/16/2010

Palo Alto, CAScientists at the Carnegie Institution's Department of Global Ecology have taken a new approach on examining a proposal to fix the warming planet. So-called geoengineering ideaslarge-scale projects to change the Earth's climatehave included erecting giant mirrors in space to reflect solar radiation, injecting aerosols of sulfate into the stratosphere making a global sunshade, and much more. Past modeling of the sulfate idea looked at how the stratospheric aerosols might affect Earth's climate and chemistry. The Carnegie researchers started out differently by asking how, if people decided what kind of climate they want, they would go about determining the aerosol distribution pattern that would come closest to achieving their climate goals. This new approach is the first attempt to determine the optimal way of achieving defined climate goals. The research is published in the September 16, 2010, issue of the Environmental Research Letters.

"We know that sulfate can cool the Earth because we have observed global temperature decreases following volcanic eruptions," explained lead author George Ban-Weiss. "Past computer model simulations have shown that injecting sulfate uniformly into the stratosphere could reduce the surface temperature of the Earth, but the equator would be over cooled and the poles under cooled. You would also make the Earth drier, and decrease surface water runoff."

The Carnegie scientists ran five simulations using a global climate model with different sulfate aerosol concentrations depending on latitude. They then used the results from these simulations in an optimization model to determine what distribution of sulfates would come closest to achieving specified climate goals. They then tested these distributions in the global climate model to assess how well the climate goals were met.

They found that with more sulfate over the poles than in tropical regions, the temperature distrib
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Contact: George Ban-Weiss
georgebw@stanford.edu
650-462-1047
Carnegie Institution
Source:Eurekalert  

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