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Science 1 November 2002:
Vol. 298. no. 5595, pp. 1012 - 1015
DOI: 10.1126/science.1075405
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Reports

Stronger Constraints on the Anthropogenic Indirect Aerosol Effect

Ulrike Lohmann,* Glen Lesins

The anthropogenic indirect aerosol effects of modifying cloud albedo and cloud lifetime cannot be deduced from observations alone but require a modeling component. Here we validate a climate model, with and without indirect aerosol effects, by using satellite observations. The model agrees better with observations when both indirect aerosol effects are included. However, the simulated clouds are more susceptible to aerosols than the observed clouds from the POLDER satellite, thus overestimating the indirect aerosol effect. By taking the difference in susceptibilities into account, the global mean total anthropogenic aerosol effect is reduced from -1.4 to -0.85 watts per square meter.

Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia B3H 3J5, Canada.
*   To whom correspondence should be addressed. E-mail: Ulrike.Lohmann{at}Dal.Ca

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Science. ISSN 0036-8075 (print), 1095-9203 (online)