Discussion
A commentator argues that all aerosols cool the climate. This is
Answer: B
Correct answer: Wrong: black carbon absorbs and warms
The claim is wrong, and black carbon is the counterexample. It absorbs sunlight rather than scattering it, warming the atmosphere directly, and where it deposits on snow and ice it darkens the surface and accelerates melting.
Sulphate and most other scattering aerosols do cool, which is why the generalisation is tempting. The net effect of the whole aerosol burden is a balance between scattering and absorbing species, and quantifying it remains one of the larger uncertainties in climate projection.
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