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Geophysical Fluid Dynamics Laboratory Review

Geophysical Fluid Dynamics Laboratory Review. June 30 - July 2, 2009. Aerosol-Cloud-Climate Interactions. Presented by Yi Ming. A prognostic treatment of aerosol-liquid cloud interactions. Prognostic Cloud Properties: Liquid water Amount Droplet number. Advection. Shallow cumulus.

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Geophysical Fluid Dynamics Laboratory Review

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  1. Geophysical Fluid Dynamics LaboratoryReview June 30 - July 2, 2009

  2. Aerosol-Cloud-Climate Interactions Presented by Yi Ming

  3. A prognostic treatment of aerosol-liquid cloud interactions Prognostic Cloud Properties: Liquid water Amount Droplet number Advection Shallow cumulus Large-scale processes • Source and sink terms are fully consistent • Multiple aerosol species (i.e., sulfate, organic carbon and sea salt) are activated • Droplets evolve freely with model meteorology Ming et al. JAS (2006, 2007)

  4. Comparison of AM3-simulated droplet number distribution with satellite data Cloud droplet number concentration (cm-3) in July at 925 hPa AM3 Derived from MODIS-retrieved cloud effective radius and optical depth Bennartz (2007)

  5. An evolving understanding of aerosol climate impacts Anthropogenic aerosol radiative flux perturbation (RFP, W m-2) at TOA from pre-industrial to present-day

  6. Dry Aerosols Cloud Droplets Cloud Albedo An approach to narrowing down the uncertainties in aerosol indirect effects Dissecting indirect effects on the process level Forcing estimates in AR4 Wet Removal Emissions Activation GCM Dynamics & Physics Cloud Albedo Effect Albedo Susceptibility Foster et al. (2007) 1st IE

  7. Comparison of AM3-simulated cloud albedo susceptibility with satellite data Difference in cloud albedo (x1000) caused by a uniform 10% increase in droplet number in July AM3 MODIS Oreopoulos and Platnick (2008)

  8. Aerosols are important for understanding regional climate change Zonal-mean responses to aerosol direct and indirect effects simulated with a modified AM2.1 coupled to a slab ocean model Surface temperature (K) Precipitation (mm day-1) BOTH GAS SUM GAS SUM AERO BOTH AERO Ming and Ramaswamy (2009)

  9. In AM3, a prognostic scheme of droplet number establishes a physical link between aerosols and clouds; Strong cooling caused by anthropogenic aerosol indirect effects is present at TOA; Theories, models and measurements are used to better constrain indirect effects; Aerosol-induced circulation changes need to be studied more thoroughly. Summary

  10. Geophysical Fluid Dynamics LaboratoryReview June 30 - July 2, 2009

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