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Summary: THE ROLE OF CLOUDS AND
AEROSOL IN CLIMATE
Day 4 Cloud parameterization
Aerosol Indirect Effect
IE = d(ln reff) / d(ln )
= aerosol extinction coefficient (1/length)
More aerosol, more extinction, so goes
upup
If drop size gets smaller, then reff goes down
If Twomey effect works, then reff should go
down as goes up
IE is a measure of sensitivity
Global Model Estimates -
Methodology
Decide on effect to be parameterized (Twomey
effect)
Implement parameterization at microphysics
level (more CCN in polluted areas results in lower
effective radius)
level (more CCN in polluted areas results in lower
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