After a critical evaluation of published data on complex refractive indices of carbon particles and soot, optical properties of carbon particles ranging from 0.2 to 100 μm were evaluated with the Mie calculation from a viewpoint of aerosol effects on the global warming. The facts are made clear ; the maximum of absorption efficiency Q
abs is around α = 1, and Q
abs of submicron particle in visible range is higher than that in infrared range ; Q
abs is not so affected by the change of an imaginary part of refractive index
k, if
k > 2.5 ; a single single albedo of carbon aerosol particle is estimated about 0.5 for a representative complex refractive index derived from the published data. Temperature of surface is surely to be affected by carbon aerosol particles ; the temperature will be dropped by carbon particles in the stratosphere, and be warmed by those in the troposphere.
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