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Tropospheric ozone: Short-lived climate forcer

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The Intergovernmental Panel on Climate Change ranks tropospheric ozone as the third most important greenhouse gas after carbon dioxide and methane. Furthermore, it also expresses a high level of confidence in the position of tropospheric ozone in this ranking. Do we share the high level of confidence expressed by the IPCC in its estimate of the radiative forcing by tropospheric ozone between 1750 and 2011? Since there are no reliable instrumental records for ozone prior to 1957, radiative forcing estimates have to be based entirely on tropospheric ozone models. In contrast, there are reliable ice core records for carbon dioxide and methane which go back to pre-industrial times and beyond. What, therefore, is our level of confidence in tropospheric ozone models?

This talk is part of the Centre for Atmospheric Science seminars, Chemistry Dept. series.

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