Objective Understand how aerosol effects on clouds can best be estimated from model simulations
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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 Estimating Aerosol Effects on Clouds 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. Impact ● The bias in previous estimates of aerosol effects on clouds has been identified and corrected. 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).
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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 - PowerPoint PPT Presentation
Transcript of Objective Understand how aerosol effects on clouds can best be estimated from model simulations
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
Estimating Aerosol Effects on Clouds
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.
Impact● The bias in previous estimates of aerosol effects on
clouds has been identified and corrected.
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).
