1. Aerosol-Cloud Interactions
Graham Feingold

2. 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”

3. Aerosol Enhances Cloud Brightness
Ship track Images, Aqua, MODIS

4. 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!

5. 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

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

7. 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