Discussion
Consider the following statements about aerosol and precipitation.
1. Smaller droplets collide and coalesce less efficiently.
2. Suppressed rain can prolong the lifetime of a cloud.
3. More nuclei reliably increase the rainfall from any cloud.
Answer: D
The first two are correct and are the basis of the second indirect effect. The third overstates a relationship that reverses in deep convective clouds where invigoration can occur instead. The sign of the effect depends on the regime the cloud belongs to.
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