Atmos. Chem. Phys. Discuss., 13, 18771-18777, 2013
www.atmos-chem-phys-discuss.net/13/18771/2013/
doi:10.5194/acpd-13-18771-2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Technical Note: Estimating aerosol effects on cloud radiative forcing
S. J. Ghan
Pacific Northwest National Laboratory, USA

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 produces estimates that are positively biased. A more representative method is suggested using the difference in cloud radiative forcing calculated as a diagnostic with aerosol scattering 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.

Citation: Ghan, S. J.: Technical Note: Estimating aerosol effects on cloud radiative forcing, Atmos. Chem. Phys. Discuss., 13, 18771-18777, doi:10.5194/acpd-13-18771-2013, 2013.
 
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