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Objective Understand how aerosol effects on clouds can best be estimated from model simulations

Estimating Aerosol Effects on Clouds. Objective Understand how aerosol effects on clouds can best be estimated from model simulations Approach Add diagnostic calculations of the cloudy-sky and clear-sky energy balance

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Objective Understand how aerosol effects on clouds can best be estimated from model simulations

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  1. Estimating Aerosol Effects on Clouds • Objective • Understand how aerosol effects on clouds can best be estimated from model simulations • Approach • Add diagnostic calculations of the cloudy-sky and clear-sky energy balance • Estimate “clean-sky” cloud radiative forcing from the diagnosed cloudy- and clear-sky energy balance with aerosol scattering/absorption neglected • Compare the clean-sky estimate with the conventional estimate that includes scattering and absorption by aerosols CAM5.1 simulations of present-day and preindustrial difference in five-year annual mean top-of-atmosphere shortwave cloud radiative forcing (top, left), clean-sky shortwave cloud radiative forcing (top right), the difference (bottom left) and the surface albedo forcing (bottom right). Impact • The bias in previous estimates of aerosol effects on clouds has been identified and corrected. Ghan SJ. 2013. “Technical Note: Estimating aerosol effects on cloud radiative forcing.” Atmospheric Chemistry and Physics 13: 9971-9974. DOI:10.5194/acp-13-9971-2013.

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