absorptivity

• However, as the absorptivity / emissivity become significant, additional cross sections are partly blocked by the cross sections already added. —  RealClimate
• Thus, optical thickness increases linearly with cross section per unit area (equal to cross section per unit volume multiplied by geometric path length), while absorptivity and emissivity 'decay' exponentially to 1 from zero. —  RealClimate
• Whatever the optical properties are, there is, at any given wavelength, some emissivity and some absorptivity that are the same at local thermodynamic equilibrium. 1 - absorptivity = reflectivity. —  RealClimate
• After the first reflection or scattering, the intensity I1 = I0* (1-absorptivity) + Ibb*emissivity. —  RealClimate
• When in local thermodynamic equilibrium, the Second Law requires absorptivity from a direction = emissivity toward a direction, at a location, along the same path, for a given wavelength and polarization. —  RealClimate

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