Aerosol-Cloud Interactions

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Presentation transcript:

Aerosol-Cloud Interactions Graham Feingold

Clouds come in all shapes and sizes Closed and Open Cells (Garay et al. 2003) Warm Continental Cumulus Actinoform Clouds Trade Cumulus Cumulus Humilis (John Day) Cumulus “ominous”

Aerosol Enhances Cloud Brightness Ship track Images, Aqua, MODIS

Clouds as Generators of Rain Micron-size drops to mm-sized drops in ~ 20 minutes 10 orders of magnitude change in mass! Aerosol particles (~ mm in size) play a role!

Aerosol Modifies Precipitation Evidence for suppression in individual warm clouds Deep convective clouds are more complex Small drops associated with pollution precipitating Non-precipitating Rosenfeld, 2000

Aerosol Suppresses Cloud: The Absorption Effect clouds smoke clouds Columbia shuttle image Amazon

Cloud Models Demonstrate fundamentals of drop activation and growth in a cloud parcel model Discuss results from 3-D models of aerosol-cloud interactions 12 km Height, m

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