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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 13, issue 19
Atmos. Chem. Phys., 13, 9971–9974, 2013
https://doi.org/10.5194/acp-13-9971-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 13, 9971–9974, 2013
https://doi.org/10.5194/acp-13-9971-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Technical note 09 Oct 2013

Technical note | 09 Oct 2013

Technical Note: Estimating aerosol effects on cloud radiative forcing

S. J. Ghan S. J. Ghan
  • Pacific Northwest National Laboratory, Richland, Washington, 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.

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