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Technical note: Estimating aerosol effects on cloud radiative forcing

by S. J. Ghan
Atmospheric Chemistry and Physics ()
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Abstract

Estimating anthropogenic aerosol effects on the planetary energy balance through the aerosol influence on clouds using the difference in cloud radiative forcing from simulations with and without anthropogenic emissions pro-duces estimates that are positively biased. A more represen-tative method is suggested using the difference in cloud ra-diative forcing calculated as a diagnostic with aerosol scat-tering and absorption neglected. The method also yields an aerosol radiative forcing decomposition that includes a term quantifying the impact of changes in surface albedo. The method requires only two additional diagnostic calculations: the whole-sky and clear-sky top-of-atmosphere radiative flux with aerosol scattering and absorption neglected.

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